Management Information Systems Project Research Paper

Management Information Systems Project - Research Paper Example The dot.com bubble was a cycle that emerged in form of nuttiness. Although the dot.com bubble was a new bust, it was not the first bubble to come up. This is because there was the CD-ROM bubble that was in existence. This CD-ROM bubble was from the companies like the bill gate’s company by the name â€Å"information at your fingertips†. This company was among the companies that were the watchword of the world. Another example of a company that was with the CD-ROM bubble is the Microsoft home (Preissl, Bouwman & Steinfield, 2004). The chief reason for the upcoming of the dot.com was to offer an e- commerce service to the computer internet users. The bubble was basically for the marketing in the internet to the potential client. The dot.com bubble aimed at increasing the internet stock market for specific companies which were calling themselves the dot.com. The NASDAQ was at the highest level of its stock marketing records during the dot.com bubble. Subsequently, NASDAQ i s the dominant and widely known for the market capitalization. For instance, the NASDAQ in the year of 2000 was able to make up to about 5048.62 peak value, which was double the previous year’s amount which was roughly 2500. This was consequently termed the2000 burst as the cataclysmic. The chief examples of the big busts that were capable of buying these bubbles included the Microsoft Company, the dell, and also the Intel Company. Additionally, the Cisco Company, the oracles and also the sun Microsystems Company. These companies were competent of venturing into this business by funding the bubble. For instance, a sum of approximately 600 US Dollars was put for utilization in the starting up of the wed 2.0. Unfortunately, this funding did not lead to the subsequent success of the bubble. Thus it was a loss to the companies that put their money into the venture. Moreover, these companies that were dealing with the internet business were known by the name of the â€Å"four hor semen of the NASDAQ.† this was chiefly due to their significance in the contribution of the capitalization in the business industry (Preissl, Bouwman & Steinfield, 2004). Unfortunately, the NASDAQ lost a huge sum of cash during the funding of the web 2.0 and also the dot.com. This is because the NASDAQ businesses thought that they were going to get a higher amount of revenue from the investments in this bubble. The chief significant acquisitions market is the sole vital and further the only feasible supply of the potential startup of this bubble. Though there has been a significantly large and further potential high profile of the web 2.0 acquirement, the investors have subsequently been reducing their potential expectations since the time of 1998 (Argenti & Barnes, 2009). Evidently, the price of these companies that was capable of acquiring was large during the first year of the funding. Unfortunately the amount began to reduce for the next coming financial years, thus leadin g these companies into a financial loss (Preissl, Bouwman & Steinfield, 2004). We learn from the dot.com bubble that when making long-term investments, we should do it when prices are not overvalued as well as when fundamentals are good, especially when it comes to stock market. This is because the market is bound to clash due to overvaluing of prices as well as due to poor fundamentals. In case of short-term investments, one should trade and upon getting the profit, move out. Last, one should be skeptical when a company is promising to make life-altering

Mythology Essay Example | Topics and Well Written Essays - 250 words

Mythology - Essay Example The Mayans associated creation with magic and divination, and regarded their gods and heroes as divine (â€Å"Mayan Mythology†). In addition, they believed that the present world was a recent creation, but would eventually be destroyed as it is on doomsday. The Mayans also believed in a universe that comprised of heavens and underworlds and the human world sandwiched between them (PaganSpace.net). In relation to the above, there are numerous descendants of the Mayan culture in the modern society mainly of the Hispanic descent. As such, I would expect the individuals to be highly superstitious and dedicated to their course. This is owing to the traditions held by their ancestors and culture that has been taught to them. However, with the expiry of the Mayan calendar it is expected that the culture will suffer a setback as their prediction of doomsday failed to pass. To the same effect, many may opt for alternative beliefs and cultures in an effort to substitute for their

Management Information Systems Project Research Paper

Management Information Systems Project - Research Paper Example The dot.com bubble was a cycle that emerged in form of nuttiness. Although the dot.com bubble was a new bust, it was not the first bubble to come up. This is because there was the CD-ROM bubble that was in existence. This CD-ROM bubble was from the companies like the bill gate’s company by the name â€Å"information at your fingertips†. This company was among the companies that were the watchword of the world. Another example of a company that was with the CD-ROM bubble is the Microsoft home (Preissl, Bouwman & Steinfield, 2004). The chief reason for the upcoming of the dot.com was to offer an e- commerce service to the computer internet users. The bubble was basically for the marketing in the internet to the potential client. The dot.com bubble aimed at increasing the internet stock market for specific companies which were calling themselves the dot.com. The NASDAQ was at the highest level of its stock marketing records during the dot.com bubble. Subsequently, NASDAQ i s the dominant and widely known for the market capitalization. For instance, the NASDAQ in the year of 2000 was able to make up to about 5048.62 peak value, which was double the previous year’s amount which was roughly 2500. This was consequently termed the2000 burst as the cataclysmic. The chief examples of the big busts that were capable of buying these bubbles included the Microsoft Company, the dell, and also the Intel Company. Additionally, the Cisco Company, the oracles and also the sun Microsystems Company. These companies were competent of venturing into this business by funding the bubble. For instance, a sum of approximately 600 US Dollars was put for utilization in the starting up of the wed 2.0. Unfortunately, this funding did not lead to the subsequent success of the bubble. Thus it was a loss to the companies that put their money into the venture. Moreover, these companies that were dealing with the internet business were known by the name of the â€Å"four hor semen of the NASDAQ.† this was chiefly due to their significance in the contribution of the capitalization in the business industry (Preissl, Bouwman & Steinfield, 2004). Unfortunately, the NASDAQ lost a huge sum of cash during the funding of the web 2.0 and also the dot.com. This is because the NASDAQ businesses thought that they were going to get a higher amount of revenue from the investments in this bubble. The chief significant acquisitions market is the sole vital and further the only feasible supply of the potential startup of this bubble. Though there has been a significantly large and further potential high profile of the web 2.0 acquirement, the investors have subsequently been reducing their potential expectations since the time of 1998 (Argenti & Barnes, 2009). Evidently, the price of these companies that was capable of acquiring was large during the first year of the funding. Unfortunately the amount began to reduce for the next coming financial years, thus leadin g these companies into a financial loss (Preissl, Bouwman & Steinfield, 2004). We learn from the dot.com bubble that when making long-term investments, we should do it when prices are not overvalued as well as when fundamentals are good, especially when it comes to stock market. This is because the market is bound to clash due to overvaluing of prices as well as due to poor fundamentals. In case of short-term investments, one should trade and upon getting the profit, move out. Last, one should be skeptical when a company is promising to make life-altering

Dear Board of Directors Essay Example for Free

Dear Board of Directors Essay Upon implementing a Broad Differentiation strategy, Andrews Company desired to have highly demanded products in each of the market segments, hold the majority market share compared to our competitors and increase the value of our firm by the year 2021. We believed that this strategy could get us to that point and we have successfully done so. The start up of Andrews Company proved to be more difficult than anticipated due to high costs in marketing and RD, investing in automation of sensors and due to our decision to take out most of our loans in the early stages of our product, leading to negative profits for the first two years. However, Broad Differentiation lucratively brought Andrews market share up to 30.93% outweighing the competition (Exhibit 1). Andrews Company will continue to implement this strategy with the goal to hold high demand, continue cutting costs with total quality management initiatives and by reevaluating our capacity and production issues, which will be discussed throughout the course of our analysis. Research and Development Proper allocation of funds towards research and development proved to be of high importance, allowing customers to have access to better-quality products. Andrews Company effectively adjusted each product to their proper ideal spot on the perceptual map by using the segment centers and ideal spot offsets annually. This allowed Andrews to gain optimal market demand, leading to us being able to charge a higher price than competitors later on, thus obtain higher profit among other initiatives. Our high demand was essential in offsetting the costs associated with investing in marketing and promotional budgets, buy/sell capacity and automation of products. Marketing By investing insistently in promo and sales in all the market segments, we were able to increase accessibility and market demand. It was Andrews’s goal to have our products be in the minds of customers of all types and charge a premium for our excellent designs. Another advantage Andrews had over our competitors was that we forecasted at our potential market share, rather than our actual, based on the presumption our customers will be loyal to our brand and we would continue to invest in marketing expenditures. Once we feel comfortable that we hold enough market share, we can then start to cut costs in this department. Finances Monitoring spending and Andrews finances was perhaps the most vital part of our success. In the earlier years of our company we took out large quantities of long-term debt to help finance investment in automation and lowering the cost of producing sensors. Each year Andrews experienced a steep increase in sales, while variable costs gradually increased (Exhibit 2). The extra debt we took out early on we believe to have assisted with the dramatic increase in profits each year (Exhibit 3). One thing Andrews could have done to also assist with the increase in profits was to issue stock, which would have helped raise more capital to invest in capacity capabilities. However, we felt that issuing stock would have diluted the price. We successfully raised our stock price to $281.95 by the end of 2021 (Exhibit 4). A 723% increase from the start of 2014. Production A barrier for further success of Andrews Company was production versus capacity. While production was upwards of 18,000+, capacity only resulted in roughly 11,000. Each year we gradually invested more and more in automation and capacity due to our rising profits, which allowed us to improve our margins (Exhibit 5). We should have properly invested in capacity in the earlier rounds to help bridge the gap between capacity and production. However, Andrews’s strategy was to focus on correctly adjusting our products on the perceptual map to their ideal spots and we planned to never invest so much so that this could not happen. TQM and Human Resources In 2017, Andrews met labor demands and we paid our employees a higher rate than competitors. This tactic was able to put some of the other employees in competitive firms to go on strike for several days, resulting in a higher market share and a better reputation among customers and potential employees. Andrews also spent money each year on training employees for a maximum of 80 hour and recruiting spend of about $4.5 million each year, increasing our productivity index to 129.9% by the end of 2021. At the beginning of 2016, Andrews made an executive decision to invest in total quality management. Of a budget of $4 million, we allotted $1.5 million in 2016 and 2017, then another $600 thousand in 2018. After this amount was spent, we would have seen diminishing returns and opted to cap out at $3.6 million. The substantial investment allowed us to reduce labor and material costs, while increasing demand, thus allowing us to steadily increase profits each year, especially during this three-year span when competitors did not spend enough in TQM. The Future of Andrews Andrews Company will continue to use its method of broad differentiation in the upcoming years and plans to issue stock in order to help with investing in capacity issues that we’ve had in the past. We will continue to spend on marketing, research and development and compensating our employees adequately in order to keep our high market share. Distinguishing our products will continue to be of the utmost importance, offering clientele a superior design. Appendix

Health Benefits and Problems of Drinking Green Tea

Health Benefits and Problems of Drinking Green Tea Introduction Green tea was originated from China and has been consumed for thousands of years. It was initially used as a natural remedy and in religious ceremonies before it became a beverage. Heavy green tea drinkers like the monks and Japanese have been known to live longer than average people. It is believe that regular consumption of tea is good because it helps to relax ones mind, decrease his need for sleep, and lightens his weight by reducing fat in the body system. These observations have been gradually proven by scientists. Today, several billion cups of green tea are consumed daily by people around the world. It has become one of the most widely consumed drinks and popular even among younger generations who are health conscious. Although the majority of drinkers are Asians, it is gaining popularity in the West as more people hear how beneficial it can be to human health. Many people who used to drink coffee or black tea with milk are now joining the trend of drinking green tea. Those w ho do not enjoy drinking green tea but want its health benefits can take green tea extracts in the form of supplements. Aims for the dissertation A lot of studies and research have been done on green tea extracts and their effects on health the past few decades. While most scientists confirmed the goodness of green tea, some experts expressed concerns about the potential health risks of consuming too much green tea extracts. The objective of this paper is to look at the benefits and drawbacks of consuming green tea. It also attempts to find out whether green tea is really so good and as safe as so many people claim or think it to be. Methodology There are now many books about green tea, websites designed to inform and update visitors on green tea, as well as thousands of scientific articles, research studies and media reports on the health benefits and potential risks. This paper was based on information and data from secondary source, mainly literature review of books, journal articles searched from the Internet database and newspaper reports. Updates from government and official websites were also used. Overall structure This dissertation looks at the history of green tea, its composition, applications and uses. It then discusses the health benefits and potential risks of the green tea extracts, as well as the controversy about some of the health claims. Background There are different varieties of the tea plants and as many as 500 existing species of tea grown in around 50 different countries, with China having the most species than the others. Most tea specialists prefer to cultivate the species Camellia sinensis which almost all green tea comes from. Green teas are made exclusively from the young leaves and buds of the Camellia sinensis plant. This plant is a slow-growing evergreen perennial tree of the genus Camellia, which survives in tropical or sub-tropical rainforest climates and thrives at altitudes of 2,100 meters above sea-level. The two parent strains were originated in Darjeeling, Assam and China. In order to harvest them more easily and conveniently, the trees are kept short as shrubs. There is no uniform grading for green tea. Good quality green tea consists of a leaf and a bud. The eight criteria to determine good green tea are the appearance, shape, colour, completeness, aroma, liquor, flavour and wet leaf. Green tea processing Teas are classified into three major types, depending on how they are processed: green, black and oolong. Green teas are made from unfermented leaves. They are steamed, roasted, or pan-fried almost immediately after being picked. Since there is no time for them to ferment, no chemical change occurred. This is why it tends to be lighter in color and have the delicate green character. Oolong teas are produced when the fresh leaves are subjected to a partial fermentation stage before drying. Black teas undergo post-harvest fermentation stage before drying and steaming. As a result of the fermentation and oxidation, many of the components in the tea leaves that are beneficial for health are destroyed during the production of black tea. Green tea is considered better than black tea or oolong tea for health reasons because it does not go through fermentation or oxidation during its production. It is the purest form of all teas. In China, green tea leaves are allowed to dry naturally before they are roasted or pan-fried. Such treatments prevent fermentation and soften the leaves which will then be rolled and twisted to remove additional moisture. The Japanese use a steaming method before rolling, twisting and drying the leaves. Chinas green tea is known to be the most delicate of all with a sweet and mild grassy taste. Some of the best Chinese green tea like fine Dragonwell could result in five or more infusions. The best green teas are those picked during early spring around the time of the Qing Ming Festival. Modern tea masters could list 500 or more green teas which could be plucked and processed slightly differently to give slightly different taste. History of green tea Green tea has been used by people as a healthy and medicinal drink for thousands of years. There are many different stories about how it was first discovered. The most popular one from China dated as far back as 2737 B.C. The Chinese legend described how Shen Nong accidentally discovered the soothing taste of the beverage after a leaf dropped from a tea plant into a pot of boiling water while he was in the garden. He became very interested in the infusion and began to study about its various healing properties. Other stories of tea link it with Zen Buddhism. Whichever is true, there is no doubt that tea was originated from China. Anthropologists have reasons to believe that prehistoric humans living in the area of Yunnan chewed on the leaves of tea trees to increase their alertness when hunting. Fresh green tea leaves were gradually used by people for medicinal properties such as to treat depression, digestive and nervous conditions. During the Han dynasty, tea plants were known to b e grown by monasteries in Sichuan. Some people started to steam tea leaves and then compressed them into cakes. These tea bricks would be baked and hardened so that they could be prevented from spoiling and be kept for a longer time. By the Tang Dynasty, as tea cultivation improved and trade increased, tea drinking became very popular in the upper class. Tea rules and ceremony were developed during this golden age of tea. Gradually, tea was consumed as a common healthy drink for all levels of society in China and Tibet instead of mainly used as a remedy to treat different health complaints for certain groups of people. Around A.D. 780, a book dedicated to tea called Cha Ching (Tea Classics) written by Lu Yu was published. He described in great details how tea was grown, cultivated and processed. He even wrote about the utensils and proper way of tea consumption. It was Lu Yu who transformed the process of tea drinking into a form of art, which would eventually be passed to Japan by monks who travelled around Asia. As the popularity of drinking tea continued to grow in China, a tea culture began to develop in Zen ceremonies and secular society in Japan, where the tea plant was able to adapt very well. The tradition of drinking green tea involves a wide range of green tea and is still an important part of their society. By the 12th century, tea plants were already exported to Japan on a large scale. It was until the 14th century when the culture of drinking tea was first introduced to Europe via the Silk Road and soon spread to other parts of the world. During the 1600s a Chinese ambassador brought tea to Moscow which led to a flourishing tea trade to Russia. The Manchus were in power when China was the most important trading country in the world and tea trade was a monopoly. The Portuguese were the first traders to bring tea to Europe in large scale. China was able to be a sole exporter of tea by keeping the knowledge of tea cultivation technique for a long time. It was the British, eager to learn how to cultivate tea, who uncovered the secret of growing tea outside China in the 1800s. They sent a man to China who disguised himself as a merchant. The seeds he collected in China were brought to India but efforts to cultivate them failed. However, experiments using the Chinese techniques to grow loca l India tea plant were successful. Since the 19th century, the British began to cultivate tea on plantations in the colonies of India and Sri Lanka. It was only then when black tea, mass-produced and sold in packets, became more popular in the rest of the world. Nowadays, the tea plant is cultivated in many countries around the world, with China, Japan, India and Sri Lanka being the greatest producers. About 3.1 million tons of dried tea is produced every year, 20% of which is green tea. Although green tea has been consumed by the Chinese and Japanese for such a long time, its popularity increased only gradually in the West as the health benefits became more widely known. This is because green tea research has been widely conducted only in recent years by scientists. In fact, well-publicized results of research on green tea have been available only since the early 1990s. Green tea is now one of the most popular beverage consumed by people besides water. In some places, brewed tea steeped from carefully harvested green tea leaves of delicately grown tea tree is treated like prized wine or rare coffee. As studies continue to show evidence of its benefits, green tea will continue to be sought after by more and more people everywhere. The use of green tea and its extracts by manufacturers will continue to increase as green teas reputation keeps growing. Green tea components While the history of green tea is long and interesting, its chemistry is complex and studied by scientists only quite recently. To understand more about green tea extracts and their effects on health, it is necessary to look at the composition as well as chemical and biochemical properties of green tea. The composition of green tea leaf is very similar to that of other fresh leaf since green tea, being the most natural form of tea, is made from unfermented leaves from the tea plant. Only a few changes to the enzymes of the leaves occur right after they are plucked from the plant and some new volatile substances are produced when they are dried. The buds and leaves of the tea plant contain carbohydrates, proteins, lipids, enzymes and the genetic material necessary for growth and photosynthesis. The main constituents of the leaves are polyphenols, the catechin and catechin-derived antioxidants; caffeine; theobromine; theophylline; and theanine. Other compounds in green tea that affect the human health are fluoride, minerals, vitamins such as B1, B2 and C, and trace elements such as chromium and manganese. Table 1 Mean Composition (%) of Green Tea Compound Green tea* Phenolic compounds** 30 Fibre 26 Proteins 15 Others carbohydrates 7 Lipids 7 Minerals 5 Amino acids 4 Pigments 2 Oxidised phenolic compounds*** 0 *Data referred to dry weight of tea leaves. **Especially flavonoids. ***Especially thearubigins and theaflavins. [Sources: Belitz DH, Grosch W(1997), Qu?mica de los Alimentos. Zaragoza: Acribia] The amount of these ingredients differs according to where the green tea is cultivated and age of the leaves. Young leaves and buds contain more caffeine while older leaves have larger amount of tannin (flavonols).[2] Fresh green tea buds and leaves contain 75-80% water while the polyphenol components make up the remaining 20-25% of solid matter. Careful drying could prevent changes to the active ingredients of the green tea leaves whereas fermentation and oxidation that occur when black tea is processed would cause chemical changes. This leads to the major difference in the effects and taste between black tea and green tea. Green tea extracts are herbal derivatives from green tea leaves which are used or taken orally by people. The extracts can be divided into 4 categories: a) Strong infusions Green tea leaves are processed by soaking in alcohol solution; b) Soft extracts the solution made by strong infusion is concentrated to 20 25%; c) Dry extracts the solution from strong infusion is further concentrated to 40 50% solids and turned into dehydrated extract powder; d) Partly purified extracts techniques such as solvent extraction, column chromatography, membrane extraction and separation are used to acquire more purified derivatives of green tea in order to produce supplements like green tea tablets and capsules. Tea Polyphenols The color of green tea is partly due to chlorophyll and partly due to a kind of naturally occurring compound in it, called polyphenols. These compounds are responsible for the pungency and unique flavor of green tea. They are antioxidants which is a type of phytochemical compounds found in most plants, vegetables and fruits as well as coffee, cocoa, wine and tea. Polyphenols are the most biologically active group among the tea components, with antioxidative, antimutagenic and anticarcinogenic effects. Exposure to oxygen during enzymatic process reduces polyphenols levels. Green tea has unaltered polyphenols because unlike oolong or black tea, they do not undergo oxidation. Because of this, green tea has the greatest effect on health among all teas. In green tea, polyphenols are in the form of flavonoids. The main flavonoids present in green tea are the green tea catechins (GTC) which comprise four major derivatives: (-)-epigallocatechin-3-gallate (EGCG) (represents approximately 59% of the total of catechins); (-)-epigallocatechin (EGC) (19% approximately); (-)-epicatechin-3-gallate (ECG) (13.6% approximately); and (-)-epicatechin (EC) (6.4% approximately). Catachins have a carbon structure C6-C3-C6 composed of two aromatic rings. [Source: V. Jane, et al. (Jan 2003), Tea Catechins and Polyphenols: Health Effects, Metabolism, and Antioxidant Functions, Critical Reviews in Food Science and Nutrition, 43(1):89-143] The catechin content of green tea depends on how the leaves are processed, the geographical location and growing conditions (e.g. soil, climate, agriculture, practices and fertilizers), the type of green tea and the infusion (e.g. brew time, temperature) Green tea polyphenols are important for their ability to halt the damaging effects of oxidation which is a process of molecular DNA damage caused by the formation of toxic molecules called free radicals that develop in the human body. Individual catechins have different antioxidative and health properties. Other compounds found in different plants also have antioxidative action. Catechins found only in green tea however have been proved to be more effective than many well-known antioxidants. Professor Catherine Rice-Evans of the Guys Hospital in London carried out tests and determined that green tea catechins have greater effects as antioxidants than the same quantity of Vitamin C and E, or beta-carotene. She also ranked the catechins according to the proportion of their presence in green tea. According to her study, EGCG was the most active of the catechins, responsible for 32% of the antioxidant property of green tea. The order from most antioxidative to least antioxidative are: 1) EGCG 2) EGC 3) ECG and 4) EC. Caffeine Caffeine is a central nervous system stimulant belonging to the family of chemicals called methylxanthines. It can be found in more than sixty different plants. [8] Most of them have been utilized as foods or beverages by people since ancient times. Caffeine is a trimethyl derivative of purine 2,6-diol. It was first discovered in coffee by Runge in 1820 and later isolated from tea by Nakabayashi. Caffeine content is usually 2.5-4.5% in dry green tea leaves. The amount of caffeine in green tea drink is about 1/10 to 1/5 of that in brewed coffee. [Source: V. Jane, et al. (Jan 2003), Tea Catechins and Polyphenols: Health Effects, Metabolism, and Antioxidant Functions, Critical Reviews in Food Science and Nutrition, 43(1):89-143] Caffeine has a strong effect on the brain and muscles which is why drinker will experience a mental boost shortly after drinking tea. The amount of caffeine varies among different types of tea. Black tea has the greatest amount whereas green tea contains only one-third the caffeine of black tea. It has been shown in many studies that caffeine improves cognitive performance and certain aspect of memory. Besides mental health, caffeine may also helps to enhance ones emotional health, for example, making the drinker feel energized and motivated to work. Caffeine is known to be a cardiac stimulant and a diuretic. It also stimulates the cerebral cortex, causing excitation in the central nervous system. However, it may have adverse effects on some people and its intake could cause health risks instead of benefits. Because of that, this component is often removed and excluded when green tea is extracted for applications such as health supplements. Nutrients Besides polyphenols and caffeine, the two most commonly known components, green tea also actually contains many nutrients, including different kinds of vitamins and inorganic compounds. Vitamins Commercial green tea leaves contain about 280mg of Vitamin C (VC, ascorbic acid) per 100g of dried leaves. The content of Vitamin C in green tea can be ten times that in black tea because the vitamin is partly destroyed during fermentation, which green tea does not undergo. Other vitamins found in green tea in different amounts are Vitamin B2, Vitamin D, Vitamin K, and carotenoids. Inorganic elements There are many minerals in green tea such as calcium, iron, copper, sodium, zinc and potassium. Green tea can also be a rich source of selenium if it is grown in a soil rich in this essential mineral. Another important mineral found in green tea is manganese which is used by the body in digesting protein as well as maintaining healthy bones and connective tissue. Green tea also contains a lot of fluoride the mineral known for fighting dental cavities. The amounts of aluminum in green tea leaves are higher than any other plants. Fortunately, the tea plant is able to biochemically neutralize the toxicity of aluminum, which exists mainly in a chelate form, which is less absorbable than the ionic form, with less potential to cause adverse effect on health. Experiments on animals and people also confirm that tea catechins can prevent the damage caused by accumulation of aluminum in the bones. Some specific inorganic compounds in the tea plant are aluminum, fluorine, and manganese. Table 2 Inorganic Elements and their contents in green tea leaves (per 100g dried leaves) ElementContent ElementContent N3.5 7.1   Ã‚  (g)  Ã‚   Al420 3,500   Ã‚  (ppm)  Ã‚   P0.2 0.7   Ã‚  (g)  Ã‚   As0.20 0.42   Ã‚  (ppm)  Ã‚   K1.6 2.5   Ã‚  (g)  Ã‚   Ba1.3 5.1   Ã‚  (ppm)  Ã‚   Ca0.12 0.57   Ã‚  (g)  Ã‚   Br7.8 25.0   Ã‚  (ppm)  Ã‚   Mg0.12 0.30   Ã‚  (g)  Ã‚   F17 260   Ã‚  (ppm)  Ã‚   S0.24 0.48   Ã‚  (g)  Ã‚   Na20 33   Ã‚  (ppm)  Ã‚   Fe100 200   Ã‚  (ppm)  Ã‚   Ni1.3 5.9   Ã‚  (ppm)  Ã‚   Mn500 3,000   Ã‚  (ppm)  Ã‚   Pb2.2 6.3   Ã‚  (ppm)  Ã‚   Cu15 20   Ã‚  (ppm)  Ã‚   Rb8 44   Ã‚  (ppm)  Ã‚   Mo0.4 0.7   Ã‚  (ppm)  Ã‚   Sc0.2   Ã‚  (ppm)  Ã‚   B20 30   Ã‚  (ppm)  Ã‚   Se1.0 1.8   Ã‚  (ppm)  Ã‚   [Source: Standard Tables of Food Composition in Japan, Resources Council, Science and Technology Agency, Tokyo, 1991] Other Components Amino Acids The content of total nitrogen in green tea extracts ranges from 4.5 to 6%. Half of that are free amino acids, which are the building blocks of protein. The amount of amino acids in tea leaves harvested during spring time is larger than that during other seasons. Green tea contains some common amino acids like aspartic acid, glutamic acid, glycine, tyrosine etc. as well as an amino acid that is unique to it: theanine. Green tea has four basic tastes: sweet, sour, salty and bitter. There is in fact a fifth taste known as unami which is contributed by the amino acid l-theanine. This constituent was only identified in 1949, by a Japanese who discovered that theanine makes up about 50% of the free amino acids present in tea. Young tea buds harvested in early spring contain a lot more theanine than tea leaves harvested later in the year because the theanine are converted into catechins as the leaves mature. Green tea experts rate the unami taste most highly and consider it to be the most important factor in determining the quality of the tea. High grade green tea is more soothing to drink than lower grade ones because the l-theanine can decaffeinates tea naturally, making it taste less bitter. Scientific studies using electroencephalography show that if 8 times more theanine is present than caffeine, the effect of caffeine will be blunted. Studies have also shown that theanine increases production of d opamine in the brain, giving the drinker the sense of alertness while feeling relaxed. Aromatic Oils Aromatic oils play a major role in determining the fragrance of green tea. The oils accumulate as the tea leaf grows and evaporate during and after harvest of the leaf. For green tea, some aromatic oils remain in the final tea product, contributing to the taste of the tea. About 500 different aromatic oils have been identified in tea leaves. Carbohydrates Total carbohydrates in green tea leaves are about 40%, one third of which is cellulosic fiber. Starch is also contained in green tea. Tea leaves harvested in the morning when there is less starch are considered to be better in quality. Lipids Green tea leaves has an average of 4% oil by weight. The seeds of tea also contain oil of around 20-40% by weight. The oil is nondrying and has a solidifying temperature of -5 to + 15?C.>/p> Health Benefits Since the 1990s, scientists in different countries, particularly Japan, have almost suggested that every system of the body can be benefited by green tea consumption. The polyphenols are known to reduce the risk of cancer before genetic mutations occur by neutralizing free radicals, prevent cardiovascular disease by preventing LDL cholesterol from changes that promote heart disease, and protect the body from various other illnesses. As more people around the world hear about these benefits, it has become increasingly popular for those who want a healthy life style to drink green tea as beverage or take green tea extracts as supplements. Antioxidant Effects Free radicals are highly reactive molecules that could damage the body and lead to many diseases if left alone. They take an electron form another molecule, turning it into another electron-deficient free radical that can take an electron from a third molecule and so on, leading to a chain reaction. The human body has a number of antioxidant molecules that help to defend it against degenerative diseases, but sometimes they may be overwhelmed by the free radicals. Antioxidants are substances that patrol the body and quench free radical reactions. [8] The antioxidant property of green tea extract is the most basic of all the health benefits of green tea. Many plant foods provide an abundant source of antioxidant nutrients. Polyphenols in green tea are among the most effective. Gramza Anna et al. examined the antioxidative activity of several biologically active components from plants to find which are safe for people and showing high antioxidant activities if added to food with lipids such as lard. Results show that the 1000ppm green tea ethanol extract inhibited the oxidation process most strongly among samples of green and black tea leaves. It was observed that the antioxidant activity was higher in tea extracts containing high levels of ECG, EC and C. The US Department of Agriculture (USDA) analysed nearly 400 foods for their EGCG content and published a report in 2007. It showed that regular green tea contains the highest concentration of antioxidants, followed by decaffeinated green tea, flavored green tea and instant or bottled green tea. That USDA study also showed why green tea is the best way to ingest antioxidants. One gram of green tea steeped in 100 millimeters of water yields 127 milligrams of catechins whereas 100 grams of dark chocolate contains only 54 milligrams, blueberries 52 milligrams and black grapes just 22 milligrams. Since tea contains higher levels of antioxidants than many fruits and vegetables, green tea consumption can protect the cells in the human body from damage caused by free radicals. Flavonoids, act as antioxidants, through four possible mechanisms: 1) as reducing agents, disarming free radicals. 2) by donating hydrogen molecules to prevent the formation of free radicals. 3) by quenching singlet oxygen that would otherwise act as a free radical in the body. 4) by binding with metals that could otherwise initiate the creation of free radicals. Among the four polyphenols in green tea, EGCG has been found to be particularly effective as an antioxidant. Researchers from Rutgers University concluded that the strong antioxidant activities of green tea are mainly due to the higher content of EGCG after comparing the antioxidant effect of various polyphenols in green tea and oolong tea. [23] Studies of the effects of tea consumption in people confirm evident that green tea is the most effective scavenger of free radicals among the different types of tea. In one study, five adults each drank two cups of green tea while five others drank the same amount of black tea. Both green and black teas improve the antioxidant capability of the blood, but green tea was found to be six times more powerful. Scientists also found that fresh green tea extracts is a better scavenger of singlet oxygen than stale green tea extract. Green tea polyphenols are also effective in quenching other free radicals such as hydrogen peroxide and superoxide. Diabetes Mellitus Diabetes mellitus is known to affect the structure and function of myocardium, causing increased collagen in the heart and reducing cardiac function. Babu and his team from India found that the antioxidant enzymes of diabetic rats are not sufficient and efficient enough to reduce the oxidative stress caused by hyperglycemia. In 2006, their investigation showed that green tea treatment is effective in controlling the antioxidant system in the heart and aorta by alleviating lipid peroxidation. In 2007, their studies suggested that administration of green tea extract may improve myocardial collagen changes in diabetic rats. They believe that the antioxidant, antihyperglycemic, and hypolipidemic effects of green tea catechins may be responsible and concluded green tea may provide a therapeutic option for the treatment of cardiovascular complications in diabetes. HIV The majority of the worlds 33 million HIV cases were infected through heterosexual sex with 96% of new infections occurring in developing countries. Therefore ways to fight the spread of HIV in poor countries are extremely necessary. Previously, scientists have carried out lab tests and reported that EGCG may prevent HIV from binding to the T-cells in the immune systems protecting them from HIVs damage. Although they knew that EGCG inhibited HIV in test tubes, they did not know if the findings would be useful beyond the lab. [26] Just recently, researchers in Germany have found a practical way to use EGCG to help prevent the spreading of AIDS. The researchers found that EGCG was capable of neutralizing a protein in sperm that served as a vector for the transmission of the virus that causes AIDS during sex. They say that the use of green tea in vaginal creams could provide a simple and affordable way to reduce cases of HIV infection. Neuroprotective Effects Parkinsons Disease Parkinsons disease is a progressive, degenerative disorder of the central nervous system resulting from loss of dopamine-producing brain cells. A research team led by Professor Zhao affiliated to the Chinese Academy of Sciences Institute of Biophysics using an animal model of Parkinsons disease discovered that green tea polyphenols can protect dopamine neurons. He hopes that green tea polyphenols may eventually be developed into a safe drug for Parkinsons disease in humans. Alzheimers Disease In an article published by the Journal of Neuroscience, researchers from University of South Florida reported that EGCG prevented Alzheimers-like damage in the brain of mice genetically programmed to develop the neurodegenerative disease process. They work by decreasing production of the Alzheimers-related protein called beta-amyloid which causes nerve damage and memory loss when accumulated abnormally in the brain. The researchers think that a new generation of dietary supplements containing pure EGCG might be beneficial for treating Altheimers disease. Huntingtons Disease Like Alzheimers and Parkinsons, Huntingtons disease is also a type of neurodegenerative disease caused by protein misfolding characterized by jerky and uncontrolled movements. Mutant proteins are accumulated in the brain of sufferers and become toxic to the nerve cells in the brain. A res Health Benefits and Problems of Drinking Green Tea Health Benefits and Problems of Drinking Green Tea Introduction Green tea was originated from China and has been consumed for thousands of years. It was initially used as a natural remedy and in religious ceremonies before it became a beverage. Heavy green tea drinkers like the monks and Japanese have been known to live longer than average people. It is believe that regular consumption of tea is good because it helps to relax ones mind, decrease his need for sleep, and lightens his weight by reducing fat in the body system. These observations have been gradually proven by scientists. Today, several billion cups of green tea are consumed daily by people around the world. It has become one of the most widely consumed drinks and popular even among younger generations who are health conscious. Although the majority of drinkers are Asians, it is gaining popularity in the West as more people hear how beneficial it can be to human health. Many people who used to drink coffee or black tea with milk are now joining the trend of drinking green tea. Those w ho do not enjoy drinking green tea but want its health benefits can take green tea extracts in the form of supplements. Aims for the dissertation A lot of studies and research have been done on green tea extracts and their effects on health the past few decades. While most scientists confirmed the goodness of green tea, some experts expressed concerns about the potential health risks of consuming too much green tea extracts. The objective of this paper is to look at the benefits and drawbacks of consuming green tea. It also attempts to find out whether green tea is really so good and as safe as so many people claim or think it to be. Methodology There are now many books about green tea, websites designed to inform and update visitors on green tea, as well as thousands of scientific articles, research studies and media reports on the health benefits and potential risks. This paper was based on information and data from secondary source, mainly literature review of books, journal articles searched from the Internet database and newspaper reports. Updates from government and official websites were also used. Overall structure This dissertation looks at the history of green tea, its composition, applications and uses. It then discusses the health benefits and potential risks of the green tea extracts, as well as the controversy about some of the health claims. Background There are different varieties of the tea plants and as many as 500 existing species of tea grown in around 50 different countries, with China having the most species than the others. Most tea specialists prefer to cultivate the species Camellia sinensis which almost all green tea comes from. Green teas are made exclusively from the young leaves and buds of the Camellia sinensis plant. This plant is a slow-growing evergreen perennial tree of the genus Camellia, which survives in tropical or sub-tropical rainforest climates and thrives at altitudes of 2,100 meters above sea-level. The two parent strains were originated in Darjeeling, Assam and China. In order to harvest them more easily and conveniently, the trees are kept short as shrubs. There is no uniform grading for green tea. Good quality green tea consists of a leaf and a bud. The eight criteria to determine good green tea are the appearance, shape, colour, completeness, aroma, liquor, flavour and wet leaf. Green tea processing Teas are classified into three major types, depending on how they are processed: green, black and oolong. Green teas are made from unfermented leaves. They are steamed, roasted, or pan-fried almost immediately after being picked. Since there is no time for them to ferment, no chemical change occurred. This is why it tends to be lighter in color and have the delicate green character. Oolong teas are produced when the fresh leaves are subjected to a partial fermentation stage before drying. Black teas undergo post-harvest fermentation stage before drying and steaming. As a result of the fermentation and oxidation, many of the components in the tea leaves that are beneficial for health are destroyed during the production of black tea. Green tea is considered better than black tea or oolong tea for health reasons because it does not go through fermentation or oxidation during its production. It is the purest form of all teas. In China, green tea leaves are allowed to dry naturally before they are roasted or pan-fried. Such treatments prevent fermentation and soften the leaves which will then be rolled and twisted to remove additional moisture. The Japanese use a steaming method before rolling, twisting and drying the leaves. Chinas green tea is known to be the most delicate of all with a sweet and mild grassy taste. Some of the best Chinese green tea like fine Dragonwell could result in five or more infusions. The best green teas are those picked during early spring around the time of the Qing Ming Festival. Modern tea masters could list 500 or more green teas which could be plucked and processed slightly differently to give slightly different taste. History of green tea Green tea has been used by people as a healthy and medicinal drink for thousands of years. There are many different stories about how it was first discovered. The most popular one from China dated as far back as 2737 B.C. The Chinese legend described how Shen Nong accidentally discovered the soothing taste of the beverage after a leaf dropped from a tea plant into a pot of boiling water while he was in the garden. He became very interested in the infusion and began to study about its various healing properties. Other stories of tea link it with Zen Buddhism. Whichever is true, there is no doubt that tea was originated from China. Anthropologists have reasons to believe that prehistoric humans living in the area of Yunnan chewed on the leaves of tea trees to increase their alertness when hunting. Fresh green tea leaves were gradually used by people for medicinal properties such as to treat depression, digestive and nervous conditions. During the Han dynasty, tea plants were known to b e grown by monasteries in Sichuan. Some people started to steam tea leaves and then compressed them into cakes. These tea bricks would be baked and hardened so that they could be prevented from spoiling and be kept for a longer time. By the Tang Dynasty, as tea cultivation improved and trade increased, tea drinking became very popular in the upper class. Tea rules and ceremony were developed during this golden age of tea. Gradually, tea was consumed as a common healthy drink for all levels of society in China and Tibet instead of mainly used as a remedy to treat different health complaints for certain groups of people. Around A.D. 780, a book dedicated to tea called Cha Ching (Tea Classics) written by Lu Yu was published. He described in great details how tea was grown, cultivated and processed. He even wrote about the utensils and proper way of tea consumption. It was Lu Yu who transformed the process of tea drinking into a form of art, which would eventually be passed to Japan by monks who travelled around Asia. As the popularity of drinking tea continued to grow in China, a tea culture began to develop in Zen ceremonies and secular society in Japan, where the tea plant was able to adapt very well. The tradition of drinking green tea involves a wide range of green tea and is still an important part of their society. By the 12th century, tea plants were already exported to Japan on a large scale. It was until the 14th century when the culture of drinking tea was first introduced to Europe via the Silk Road and soon spread to other parts of the world. During the 1600s a Chinese ambassador brought tea to Moscow which led to a flourishing tea trade to Russia. The Manchus were in power when China was the most important trading country in the world and tea trade was a monopoly. The Portuguese were the first traders to bring tea to Europe in large scale. China was able to be a sole exporter of tea by keeping the knowledge of tea cultivation technique for a long time. It was the British, eager to learn how to cultivate tea, who uncovered the secret of growing tea outside China in the 1800s. They sent a man to China who disguised himself as a merchant. The seeds he collected in China were brought to India but efforts to cultivate them failed. However, experiments using the Chinese techniques to grow loca l India tea plant were successful. Since the 19th century, the British began to cultivate tea on plantations in the colonies of India and Sri Lanka. It was only then when black tea, mass-produced and sold in packets, became more popular in the rest of the world. Nowadays, the tea plant is cultivated in many countries around the world, with China, Japan, India and Sri Lanka being the greatest producers. About 3.1 million tons of dried tea is produced every year, 20% of which is green tea. Although green tea has been consumed by the Chinese and Japanese for such a long time, its popularity increased only gradually in the West as the health benefits became more widely known. This is because green tea research has been widely conducted only in recent years by scientists. In fact, well-publicized results of research on green tea have been available only since the early 1990s. Green tea is now one of the most popular beverage consumed by people besides water. In some places, brewed tea steeped from carefully harvested green tea leaves of delicately grown tea tree is treated like prized wine or rare coffee. As studies continue to show evidence of its benefits, green tea will continue to be sought after by more and more people everywhere. The use of green tea and its extracts by manufacturers will continue to increase as green teas reputation keeps growing. Green tea components While the history of green tea is long and interesting, its chemistry is complex and studied by scientists only quite recently. To understand more about green tea extracts and their effects on health, it is necessary to look at the composition as well as chemical and biochemical properties of green tea. The composition of green tea leaf is very similar to that of other fresh leaf since green tea, being the most natural form of tea, is made from unfermented leaves from the tea plant. Only a few changes to the enzymes of the leaves occur right after they are plucked from the plant and some new volatile substances are produced when they are dried. The buds and leaves of the tea plant contain carbohydrates, proteins, lipids, enzymes and the genetic material necessary for growth and photosynthesis. The main constituents of the leaves are polyphenols, the catechin and catechin-derived antioxidants; caffeine; theobromine; theophylline; and theanine. Other compounds in green tea that affect the human health are fluoride, minerals, vitamins such as B1, B2 and C, and trace elements such as chromium and manganese. Table 1 Mean Composition (%) of Green Tea Compound Green tea* Phenolic compounds** 30 Fibre 26 Proteins 15 Others carbohydrates 7 Lipids 7 Minerals 5 Amino acids 4 Pigments 2 Oxidised phenolic compounds*** 0 *Data referred to dry weight of tea leaves. **Especially flavonoids. ***Especially thearubigins and theaflavins. [Sources: Belitz DH, Grosch W(1997), Qu?mica de los Alimentos. Zaragoza: Acribia] The amount of these ingredients differs according to where the green tea is cultivated and age of the leaves. Young leaves and buds contain more caffeine while older leaves have larger amount of tannin (flavonols).[2] Fresh green tea buds and leaves contain 75-80% water while the polyphenol components make up the remaining 20-25% of solid matter. Careful drying could prevent changes to the active ingredients of the green tea leaves whereas fermentation and oxidation that occur when black tea is processed would cause chemical changes. This leads to the major difference in the effects and taste between black tea and green tea. Green tea extracts are herbal derivatives from green tea leaves which are used or taken orally by people. The extracts can be divided into 4 categories: a) Strong infusions Green tea leaves are processed by soaking in alcohol solution; b) Soft extracts the solution made by strong infusion is concentrated to 20 25%; c) Dry extracts the solution from strong infusion is further concentrated to 40 50% solids and turned into dehydrated extract powder; d) Partly purified extracts techniques such as solvent extraction, column chromatography, membrane extraction and separation are used to acquire more purified derivatives of green tea in order to produce supplements like green tea tablets and capsules. Tea Polyphenols The color of green tea is partly due to chlorophyll and partly due to a kind of naturally occurring compound in it, called polyphenols. These compounds are responsible for the pungency and unique flavor of green tea. They are antioxidants which is a type of phytochemical compounds found in most plants, vegetables and fruits as well as coffee, cocoa, wine and tea. Polyphenols are the most biologically active group among the tea components, with antioxidative, antimutagenic and anticarcinogenic effects. Exposure to oxygen during enzymatic process reduces polyphenols levels. Green tea has unaltered polyphenols because unlike oolong or black tea, they do not undergo oxidation. Because of this, green tea has the greatest effect on health among all teas. In green tea, polyphenols are in the form of flavonoids. The main flavonoids present in green tea are the green tea catechins (GTC) which comprise four major derivatives: (-)-epigallocatechin-3-gallate (EGCG) (represents approximately 59% of the total of catechins); (-)-epigallocatechin (EGC) (19% approximately); (-)-epicatechin-3-gallate (ECG) (13.6% approximately); and (-)-epicatechin (EC) (6.4% approximately). Catachins have a carbon structure C6-C3-C6 composed of two aromatic rings. [Source: V. Jane, et al. (Jan 2003), Tea Catechins and Polyphenols: Health Effects, Metabolism, and Antioxidant Functions, Critical Reviews in Food Science and Nutrition, 43(1):89-143] The catechin content of green tea depends on how the leaves are processed, the geographical location and growing conditions (e.g. soil, climate, agriculture, practices and fertilizers), the type of green tea and the infusion (e.g. brew time, temperature) Green tea polyphenols are important for their ability to halt the damaging effects of oxidation which is a process of molecular DNA damage caused by the formation of toxic molecules called free radicals that develop in the human body. Individual catechins have different antioxidative and health properties. Other compounds found in different plants also have antioxidative action. Catechins found only in green tea however have been proved to be more effective than many well-known antioxidants. Professor Catherine Rice-Evans of the Guys Hospital in London carried out tests and determined that green tea catechins have greater effects as antioxidants than the same quantity of Vitamin C and E, or beta-carotene. She also ranked the catechins according to the proportion of their presence in green tea. According to her study, EGCG was the most active of the catechins, responsible for 32% of the antioxidant property of green tea. The order from most antioxidative to least antioxidative are: 1) EGCG 2) EGC 3) ECG and 4) EC. Caffeine Caffeine is a central nervous system stimulant belonging to the family of chemicals called methylxanthines. It can be found in more than sixty different plants. [8] Most of them have been utilized as foods or beverages by people since ancient times. Caffeine is a trimethyl derivative of purine 2,6-diol. It was first discovered in coffee by Runge in 1820 and later isolated from tea by Nakabayashi. Caffeine content is usually 2.5-4.5% in dry green tea leaves. The amount of caffeine in green tea drink is about 1/10 to 1/5 of that in brewed coffee. [Source: V. Jane, et al. (Jan 2003), Tea Catechins and Polyphenols: Health Effects, Metabolism, and Antioxidant Functions, Critical Reviews in Food Science and Nutrition, 43(1):89-143] Caffeine has a strong effect on the brain and muscles which is why drinker will experience a mental boost shortly after drinking tea. The amount of caffeine varies among different types of tea. Black tea has the greatest amount whereas green tea contains only one-third the caffeine of black tea. It has been shown in many studies that caffeine improves cognitive performance and certain aspect of memory. Besides mental health, caffeine may also helps to enhance ones emotional health, for example, making the drinker feel energized and motivated to work. Caffeine is known to be a cardiac stimulant and a diuretic. It also stimulates the cerebral cortex, causing excitation in the central nervous system. However, it may have adverse effects on some people and its intake could cause health risks instead of benefits. Because of that, this component is often removed and excluded when green tea is extracted for applications such as health supplements. Nutrients Besides polyphenols and caffeine, the two most commonly known components, green tea also actually contains many nutrients, including different kinds of vitamins and inorganic compounds. Vitamins Commercial green tea leaves contain about 280mg of Vitamin C (VC, ascorbic acid) per 100g of dried leaves. The content of Vitamin C in green tea can be ten times that in black tea because the vitamin is partly destroyed during fermentation, which green tea does not undergo. Other vitamins found in green tea in different amounts are Vitamin B2, Vitamin D, Vitamin K, and carotenoids. Inorganic elements There are many minerals in green tea such as calcium, iron, copper, sodium, zinc and potassium. Green tea can also be a rich source of selenium if it is grown in a soil rich in this essential mineral. Another important mineral found in green tea is manganese which is used by the body in digesting protein as well as maintaining healthy bones and connective tissue. Green tea also contains a lot of fluoride the mineral known for fighting dental cavities. The amounts of aluminum in green tea leaves are higher than any other plants. Fortunately, the tea plant is able to biochemically neutralize the toxicity of aluminum, which exists mainly in a chelate form, which is less absorbable than the ionic form, with less potential to cause adverse effect on health. Experiments on animals and people also confirm that tea catechins can prevent the damage caused by accumulation of aluminum in the bones. Some specific inorganic compounds in the tea plant are aluminum, fluorine, and manganese. Table 2 Inorganic Elements and their contents in green tea leaves (per 100g dried leaves) ElementContent ElementContent N3.5 7.1   Ã‚  (g)  Ã‚   Al420 3,500   Ã‚  (ppm)  Ã‚   P0.2 0.7   Ã‚  (g)  Ã‚   As0.20 0.42   Ã‚  (ppm)  Ã‚   K1.6 2.5   Ã‚  (g)  Ã‚   Ba1.3 5.1   Ã‚  (ppm)  Ã‚   Ca0.12 0.57   Ã‚  (g)  Ã‚   Br7.8 25.0   Ã‚  (ppm)  Ã‚   Mg0.12 0.30   Ã‚  (g)  Ã‚   F17 260   Ã‚  (ppm)  Ã‚   S0.24 0.48   Ã‚  (g)  Ã‚   Na20 33   Ã‚  (ppm)  Ã‚   Fe100 200   Ã‚  (ppm)  Ã‚   Ni1.3 5.9   Ã‚  (ppm)  Ã‚   Mn500 3,000   Ã‚  (ppm)  Ã‚   Pb2.2 6.3   Ã‚  (ppm)  Ã‚   Cu15 20   Ã‚  (ppm)  Ã‚   Rb8 44   Ã‚  (ppm)  Ã‚   Mo0.4 0.7   Ã‚  (ppm)  Ã‚   Sc0.2   Ã‚  (ppm)  Ã‚   B20 30   Ã‚  (ppm)  Ã‚   Se1.0 1.8   Ã‚  (ppm)  Ã‚   [Source: Standard Tables of Food Composition in Japan, Resources Council, Science and Technology Agency, Tokyo, 1991] Other Components Amino Acids The content of total nitrogen in green tea extracts ranges from 4.5 to 6%. Half of that are free amino acids, which are the building blocks of protein. The amount of amino acids in tea leaves harvested during spring time is larger than that during other seasons. Green tea contains some common amino acids like aspartic acid, glutamic acid, glycine, tyrosine etc. as well as an amino acid that is unique to it: theanine. Green tea has four basic tastes: sweet, sour, salty and bitter. There is in fact a fifth taste known as unami which is contributed by the amino acid l-theanine. This constituent was only identified in 1949, by a Japanese who discovered that theanine makes up about 50% of the free amino acids present in tea. Young tea buds harvested in early spring contain a lot more theanine than tea leaves harvested later in the year because the theanine are converted into catechins as the leaves mature. Green tea experts rate the unami taste most highly and consider it to be the most important factor in determining the quality of the tea. High grade green tea is more soothing to drink than lower grade ones because the l-theanine can decaffeinates tea naturally, making it taste less bitter. Scientific studies using electroencephalography show that if 8 times more theanine is present than caffeine, the effect of caffeine will be blunted. Studies have also shown that theanine increases production of d opamine in the brain, giving the drinker the sense of alertness while feeling relaxed. Aromatic Oils Aromatic oils play a major role in determining the fragrance of green tea. The oils accumulate as the tea leaf grows and evaporate during and after harvest of the leaf. For green tea, some aromatic oils remain in the final tea product, contributing to the taste of the tea. About 500 different aromatic oils have been identified in tea leaves. Carbohydrates Total carbohydrates in green tea leaves are about 40%, one third of which is cellulosic fiber. Starch is also contained in green tea. Tea leaves harvested in the morning when there is less starch are considered to be better in quality. Lipids Green tea leaves has an average of 4% oil by weight. The seeds of tea also contain oil of around 20-40% by weight. The oil is nondrying and has a solidifying temperature of -5 to + 15?C.>/p> Health Benefits Since the 1990s, scientists in different countries, particularly Japan, have almost suggested that every system of the body can be benefited by green tea consumption. The polyphenols are known to reduce the risk of cancer before genetic mutations occur by neutralizing free radicals, prevent cardiovascular disease by preventing LDL cholesterol from changes that promote heart disease, and protect the body from various other illnesses. As more people around the world hear about these benefits, it has become increasingly popular for those who want a healthy life style to drink green tea as beverage or take green tea extracts as supplements. Antioxidant Effects Free radicals are highly reactive molecules that could damage the body and lead to many diseases if left alone. They take an electron form another molecule, turning it into another electron-deficient free radical that can take an electron from a third molecule and so on, leading to a chain reaction. The human body has a number of antioxidant molecules that help to defend it against degenerative diseases, but sometimes they may be overwhelmed by the free radicals. Antioxidants are substances that patrol the body and quench free radical reactions. [8] The antioxidant property of green tea extract is the most basic of all the health benefits of green tea. Many plant foods provide an abundant source of antioxidant nutrients. Polyphenols in green tea are among the most effective. Gramza Anna et al. examined the antioxidative activity of several biologically active components from plants to find which are safe for people and showing high antioxidant activities if added to food with lipids such as lard. Results show that the 1000ppm green tea ethanol extract inhibited the oxidation process most strongly among samples of green and black tea leaves. It was observed that the antioxidant activity was higher in tea extracts containing high levels of ECG, EC and C. The US Department of Agriculture (USDA) analysed nearly 400 foods for their EGCG content and published a report in 2007. It showed that regular green tea contains the highest concentration of antioxidants, followed by decaffeinated green tea, flavored green tea and instant or bottled green tea. That USDA study also showed why green tea is the best way to ingest antioxidants. One gram of green tea steeped in 100 millimeters of water yields 127 milligrams of catechins whereas 100 grams of dark chocolate contains only 54 milligrams, blueberries 52 milligrams and black grapes just 22 milligrams. Since tea contains higher levels of antioxidants than many fruits and vegetables, green tea consumption can protect the cells in the human body from damage caused by free radicals. Flavonoids, act as antioxidants, through four possible mechanisms: 1) as reducing agents, disarming free radicals. 2) by donating hydrogen molecules to prevent the formation of free radicals. 3) by quenching singlet oxygen that would otherwise act as a free radical in the body. 4) by binding with metals that could otherwise initiate the creation of free radicals. Among the four polyphenols in green tea, EGCG has been found to be particularly effective as an antioxidant. Researchers from Rutgers University concluded that the strong antioxidant activities of green tea are mainly due to the higher content of EGCG after comparing the antioxidant effect of various polyphenols in green tea and oolong tea. [23] Studies of the effects of tea consumption in people confirm evident that green tea is the most effective scavenger of free radicals among the different types of tea. In one study, five adults each drank two cups of green tea while five others drank the same amount of black tea. Both green and black teas improve the antioxidant capability of the blood, but green tea was found to be six times more powerful. Scientists also found that fresh green tea extracts is a better scavenger of singlet oxygen than stale green tea extract. Green tea polyphenols are also effective in quenching other free radicals such as hydrogen peroxide and superoxide. Diabetes Mellitus Diabetes mellitus is known to affect the structure and function of myocardium, causing increased collagen in the heart and reducing cardiac function. Babu and his team from India found that the antioxidant enzymes of diabetic rats are not sufficient and efficient enough to reduce the oxidative stress caused by hyperglycemia. In 2006, their investigation showed that green tea treatment is effective in controlling the antioxidant system in the heart and aorta by alleviating lipid peroxidation. In 2007, their studies suggested that administration of green tea extract may improve myocardial collagen changes in diabetic rats. They believe that the antioxidant, antihyperglycemic, and hypolipidemic effects of green tea catechins may be responsible and concluded green tea may provide a therapeutic option for the treatment of cardiovascular complications in diabetes. HIV The majority of the worlds 33 million HIV cases were infected through heterosexual sex with 96% of new infections occurring in developing countries. Therefore ways to fight the spread of HIV in poor countries are extremely necessary. Previously, scientists have carried out lab tests and reported that EGCG may prevent HIV from binding to the T-cells in the immune systems protecting them from HIVs damage. Although they knew that EGCG inhibited HIV in test tubes, they did not know if the findings would be useful beyond the lab. [26] Just recently, researchers in Germany have found a practical way to use EGCG to help prevent the spreading of AIDS. The researchers found that EGCG was capable of neutralizing a protein in sperm that served as a vector for the transmission of the virus that causes AIDS during sex. They say that the use of green tea in vaginal creams could provide a simple and affordable way to reduce cases of HIV infection. Neuroprotective Effects Parkinsons Disease Parkinsons disease is a progressive, degenerative disorder of the central nervous system resulting from loss of dopamine-producing brain cells. A research team led by Professor Zhao affiliated to the Chinese Academy of Sciences Institute of Biophysics using an animal model of Parkinsons disease discovered that green tea polyphenols can protect dopamine neurons. He hopes that green tea polyphenols may eventually be developed into a safe drug for Parkinsons disease in humans. Alzheimers Disease In an article published by the Journal of Neuroscience, researchers from University of South Florida reported that EGCG prevented Alzheimers-like damage in the brain of mice genetically programmed to develop the neurodegenerative disease process. They work by decreasing production of the Alzheimers-related protein called beta-amyloid which causes nerve damage and memory loss when accumulated abnormally in the brain. The researchers think that a new generation of dietary supplements containing pure EGCG might be beneficial for treating Altheimers disease. Huntingtons Disease Like Alzheimers and Parkinsons, Huntingtons disease is also a type of neurodegenerative disease caused by protein misfolding characterized by jerky and uncontrolled movements. Mutant proteins are accumulated in the brain of sufferers and become toxic to the nerve cells in the brain. A res

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Question #1 â€Å"Despite the economic progress brought about in part by scientific management, critics were calling attention to the ‘seamy side of progress’ which included severe labor management conflict, apathy, boredom, and wasted human resources to examine the discrepancy between how an organization was supposed to work versus how the workers actually behaved. In addition, factors like World War I, developments in psychology and later the depression, all bought into question, some of the basic assumptions of Scientific Management.† (Internet) This is where the Human Relations School steps in. Its primary focus is the importance of attitudes and feelings of workers, while informal roles and norms influence performance. â€Å"At the most general level, human relations theory views humans as social creatures who have a need and desire for communication and interaction.† (Internet) Numerous studies have been conducted over the years trying to come up with the most ef ficient form of workplace management. The most famous of these studies were those performed by the Hawthorne works (a.k.a. Hawthorne Studies) which should how work groups provide mutual support and effective resistence to management techniques in order to increase production. This study concluded that workers did not seem to respond to the classical motivation approaches that were suggested by Frederic Taylor , but rather workers were interested in rewards and punishment within their own work groups. These studies, which were conducted in the 1920’s, started as a straight forward attempt to determine the relationship between the work environment and productivity. The results of the study led researchers to feel that they were dealing with socio-psychological factors that were not explained by classical theory which in turn, stressed the formal organization and formal leadership. The Hawthorne Studies helped to show that an organization is more than a formal arrangement of fun ctions but at the same time performs the role of a social system. This position was taken by Elton Mayo , who made his own analysis of the Hawthorne experiments. He claimed that the problem of industrial societies acted as an imbalance between social and technical skills. â€Å"His analysis of the problems of industrial civilization and assessment of the human factor as nonlogical and emotional led him to view industry as a strategic in... ...rea includes the City of Pittsburgh and the suburban South Hills with its regional office located in Mt. Lebanon. Finally is the Western Region, which services an estimated 575,000 in western Pennsylvania. This area includes the communities of Indiana, New Castle, Butler, Washington, Mon Valley, and Uniontown areas, with the regional office based in McMurray.   Ã‚  Ã‚  Ã‚  Ã‚  The company’s water supply is provided principally from surface water supplies such as rivers, streams and lakes through allocation permits from the Pennsylvania Department of Environmental Protection and several river basin commissions. Water is also provided from wells and through purchase contracts and interconnection with other water providers in the area.   Ã‚  Ã‚  Ã‚  Ã‚   Bibliography Business Ethics, October 1987. Vol. 6 Issue, p 559, p7, The Imperative of Organizational Harmon. http://infosm.umist.ac.uk/wp/Papers/wp9919.htm http://www.accel-team.com/motivation/hawthorne_01.html http://www.cba.neu.edu/~ewertheim/introd/history.htm http://www.findarticles.com/ Jaffee, David. Organization Theory: Tension and Change. Hill-McGraw, New York, New York. 2001.

Ancient China Essay -- essays research papers

One of the most important inventions of all time was the invention of gunpowder. â€Å"Imagine their enemy's surprise when the Chinese first demonstrated their newest invention in the eighth century AD. Chinese scientists discovered that an explosive mixture could be produced by combining sulfur, charcoal, and saltpeter (potassium nitrate). The military applications were clear. New weapons were rapidly developed, including rockets and others that were launched from a bamboo tube† (Franklin Institute). The Chinese are known for their inventions that still are used in the modern day. Those inventions are paper, gunpowder, books, and much more.   Ã‚  Ã‚  Ã‚  Ã‚  Gunpowder was discovered in the tenth century by Chinese medicine men that were looking for the secret to immortality. They thought that gunpowder could be used as a medicine of some sort. â€Å"The invention of gunpowder gave the Chinese a distinct advantage over their enemies, changing the nature of warfare† (Ken Hsu, Willy Hsu, Micheal Lu).   Ã‚  Ã‚  Ã‚  Ã‚  At first gunpowder was used to blast rocks apart and to make fireworks, later to be used as warfare. To medieval Chinese it was simply an aid to esthetic pleasure. By the 10th century, gunpowder began to be used for military purposes in China in the form of rockets and explosive bombs fired from catapults. The first reference to cannon appears in 1126 when oil bamboo tubes were used to launch missiles at the enemy. Eventually bamboo tubes were replaced by metal tubes, and the oldest cannon in China dates from 1290. From China, the military use of gunpowder appears to have spread to Japan and Europe. â€Å"It was used by the Mongols against the Hungarians in 1241 and was mentioned by Roger Bacon in 1248. By the mid 14th century, early cannons are mentioned extensively both in Europe and in China.† (Jack Kelly). In China as in Europe, the use of gunpowder to produce firearms and cannons was delayed by difficulties in creating metal tubes that would contain an explosion. This problem may have led to the false myth that the Chinese used their invention only for the manufacture of fireworks. In fact, gunpowder powered cannons and rockets were extensively used in the Mongol conquests of the 13th century and were a feature of East Asian warfare afterwards. â€Å"The short squat and thick city walls of Beijing for example, were specifically designe... ...emoved by hand. The fibers are beaten in a blender or by hand to a creamy pulp. At this stage, dyes can be added to create colored papers. The pulp is poured into a large tub and the fibers are suspended in the water. The artisan dips a framed screen into the water and with great skill, lifts it to the surface catching the fibers onto the screen. The screens can be left in the sun to dry, or be transferred to boards, pressed, smoothed and then dried. â€Å"It wasn't until the invention of paper that information could be recorded and passed on cheaply and in greater quantity† (Paper Trading International).   Ã‚  Ã‚  Ã‚  Ã‚  Over the many years of experimenting it has paid off for the Chinese. I researched two great masterpieces from it. But there were many more inventions, like the compass, medicine, printing, embroidery and silk. When trying to find the secret to immortality they made gunpowder with a bang! When getting bored trying to make something to send messages on they made the great paper. Both of these inventions are still used this very day, maybe it will be used for a lot more in years to come.   Ã‚  Ã‚  Ã‚  Ã‚     Ã‚  Ã‚  Ã‚  Ã‚