Xem 1-11 trên 11 kết quả Trace amounts
  • Harrison's Internal Medicine Chapter 71. Vitamin and Trace Mineral Deficiency and Excess Vitamin and Trace Mineral Deficiency and Excess: Introduction Vitamins and trace minerals are required constituents of the human diet since they are either inadequately synthesized or not synthesized in the human body. Only small amounts of these substances are needed for carrying out essential biochemical reactions (e.g., acting as coenzymes or prosthetic groups).

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  • At its inception, the original plan for this symposium was to emphasize the medical aspects of inorganic chemistry, rather than to go over once more new developments in bioinorganic chemistry, important as the subject is, since the latter topic has been treated many times in recent symposia reviews and monographs.

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  • Advances in analytical chemistry methodology now allow us to detect the most minute trace amounts of pesticides. As this capacity grows, so does public concern about toxic contamination, resulting in stricter government regulations and a growing demand for even more sensitive, precise, and reliable analysis

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  • Vitamins and trace minerals are required constituents of the human diet since they are either inadequately synthesized or not synthesized in the human body. Only small amounts of these substances are needed for carrying out essential biochemical reactions (e.g., acting as coenzymes or prosthetic groups). Overt vitamin or trace mineral deficiencies are rare in Western countries due to a plentiful, varied, and inexpensive food supply; however, multiple nutrient deficiencies may appear together in persons who are chronically ill or alcoholic.

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  • Harrison's Internal Medicine Chapter 70. Nutritional Requirements and Dietary Assessment Nutritional Requirements and Dietary Assessment: Introduction Nutrients are substances that must be supplied by the diet because they are not synthesized in the body in sufficient amounts. Nutrient requirements for groups of healthy persons have been determined experimentally. For good health we require energy-providing nutrients (protein, fat, and carbohydrate), vitamins, minerals, and water.

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  • Volatile fatty acids (VFAs), principally acetate, propionate and butyrate but also lesser amounts of valerate, caproate, isobutyrate, isovalerate, 2-methylbutyrate and traces of various higher acids, are produced in the rumen as end-products of microbial fermentation....

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  • Mechanical engineering emerged as a field during the industrial revolution in Europe in the 18th century; however, its development can be traced back several thousand years around the world. Mechanical engineering science emerged in the 19th century as a result of developments in the field of physics. The field has continually evolved to incorporate advancements in technology, and mechanical engineers today are pursuing developments in such fields as composites, mechatronics, and nanotechnology.

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  • Trace Mineral Intake Zinc 2.5–4 mg/d, an additional 10–15 mg/d per L of stool or ileostomy output Copper 0.5–1.5 mg/d, possibility of retention in biliary tract obstruction Manganese 0.1–0.

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  • Another important change can be traced to the 1960s and 1970s, when some producers and dealers began testing the possibility of selling rough diamonds through alternative channels instead of the traditional practice of selling through the unified sales channel of De Beers’ CSO (see.Figure.8). In the 1990s major producers began breaking away from the CSO (later transformed into the Diamond Trading Company, or DTC) to start selling their diamonds independently on the global market.

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  • LSI’s competitive advantage is its CAM library, one of the most comprehensive and unique Complementary Alternative Medicine database of any kind, cross-linking hundreds of disease and health conditions to nutritional and herbal remedy abstracts. The database, consisting of over 280,000 pages of text updated with all current material daily, is the largest database on alternative health in existence, and it represents an invaluable research and resource tool for health care providers as well as their patients.

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  • The Phycomyces blakesleeanus wild-type is yellow, because it accumulates b-carotene as the main carotenoid. A new carotenoid mutant of this fungus (A486) was isolated, after treatment with ethyl methane sulfonate (EMS), showing a whitish coloration. It accumulates large amounts of phytoene, small quantities of phyto¯uene, f-carotene and neurosporene, in decreasing amounts, and traces of b-carotene. This phenotype indicates that it carries a leaky mutation a€ecting the enzyme phytoene dehydrogenase (EC 1.3.-.-), which is speci®ed by the gene carB....

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