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By Valerie DeBenedette

Examines the heritage, actual results, and social elements of caffeine, the main normal drug on the earth. summary: Examines the historical past, actual results, and social elements of caffeine, the main typical drug on the planet

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The somata are on the lower leaf surface. E. 17 A typical cycle begins with the formation of a small (5 mm) leaf bud that swells but ©1998 CRC Press LLC does not break for a considerable time. Eventually a scale leaf is formed from the bud and then a second scale leaf. This is followed by the production of a slightly larger growth known as fish-leaf. Further development of the bud results in the formation of normal leaves, known as the flush, which constitutes the commerically useful portion of the tea plant.

Pruning is required during the early growth of the plant in order to encourage spreading. Mature tea is pruned according to a schedule based on growing conditions. This is necessary to maintain the plant in the vegetative stage in order to stimulate young shoot growth and to keep the height of the bush controlled for efficient plucking. 22 Pesticides are used in accordance with local conditions. Fungal diseases affecting roots are treated by removal and burning of infected plants. It is especially useful prophylactically in nurseries and when establishing new plantings.

Enzymes In addition to all of the expected enzyme systems present in leaf tissue, fresh tea leaves contain a high level of polyphenol oxidase that catalyzes the oxidation of the catechins by atmospheric oxygen. 32%) isoenzymes.

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