Xem 1-15 trên 15 kết quả Mineral components
  • Zinc Zinc is an integral component of many metalloenzymes in the body; it is involved in the synthesis and stabilization of proteins, DNA, and RNA and plays a structural role in ribosomes and membranes. Zinc is necessary for the binding of steroid hormone receptors and several other transcription factors to DNA. Zinc is absolutely required for normal spermatogenesis, fetal growth, and embryonic development.

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  • Selenium Selenium, in the form of selenocysteine, is a component of the enzyme glutathione peroxidase, which serves to protect proteins, cell membranes, lipids, and nucleic acids from oxidant molecules. As such, selenium is being actively studied as a chemopreventive agent against certain cancers, such as prostate. Selenocysteine is also found in the deiodinase enzymes, which mediate the deiodination of thyroxine to triiodothyronine (Chap. 335).

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  • This book is about what we consider the essentials of human nutrition. The science of human nutrition deals with all the effects on people of any component found in food. This starts with the physiological and biochemical processes involved in nourishment—how substances in food provide energy or are converted into body tissues, and the diseases that result from insufficiency or excess of essential nutrients (malnutrition). The role of food components in the development of chronic degenerative disease like coronary heart disease, cancers, dental caries, etc.

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  • Biomimetics is the science of emulating nature’s design. In nature, living organisms synthesize mineralized tissues and this process of biomineralization is under strict biological control. It involves the interactions of several biological macromolecules among themselves and with the mineral components. Generally, natures design principles are based on a “Bott om-Up” strategy. Such processes lead to the formation of hierarchically structured organic-inorganic composites with mechanical properties optimized for a given function.

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  • HIGHER PLANTS ARE AUTOTROPHIC ORGANISMS that can synthesize their organic molecular components out of inorganic nutrients obtained from their surroundings. For many mineral nutrients, this process involves absorption from the soil by the roots (see Chapter 5) and incorporation into the organic compounds that are essential for growth and development. This incorporation of mineral nutrients into organic substances such as pigments, enzyme cofactors, lipids, nucleic acids, and amino acids is termed nutrient assimilation....

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  • To support IPM training program of our TOT, experiments, field surveys and observations, laboratory experiments and breeding were conducted in Binh Phuoc, Dong Nai and Dak Lac province between July 2006 and March 2008. Data obtained from experiments and field surveys show that • The common insect pests damaging the terminal discharge water, apples and / or nuts as tea mosquito bug, shoot borers, bugs coreid, thrips, apple seeds borers, leaf rollers, leaf miners, aphids and other cores, including tea mosquito bugs, shoot borers, leaf rollers and apple borer, the main grain...

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  • Quantitative  distribution  of  main  ions  and  other  chemical  components  of  groundwater  are characterized by theirs statistical parameters. They depend closely on probability distribution of  the  data.

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  • The concept of nutritional essentiality was firmly established less than 100 years ago. It arose from observations that certain diseases observed in human populations consuming poor diets could be prevented by including other foods in the diet and that failure of animals fed on diets composed of purified components or restricted to one or a few foodstuffs to grow and survive could similarly be corrected by including another food or an extract of the food in the diet. The food constituents that were found to prevent these problems were classified as indispensable (or essential) nutrients.

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  • We used the approach outlined above to plan, develop, assess and revise, and test and re-test the notice drafts. We used various qualitative research methodologies to collect consumer input to develop alternative privacy notices or components of notices that consumers can understand and use. The various qualitative methods took place during the first three stages (Plan, Develop, and Assess/Revise) of Kleimann’s Information Design Model. Although the final step of the Information Design Model is Evaluation, this chapter does not discuss evaluation.

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  • The most straightforward approach to valuing mineral resources relies on market transaction prices. This is the standard approach used across the national economic accounts for capital assets. When resources of petroleum, copper, gold, and other minerals are sold, the value of the transac- tion provides a basis for calculating the market value of the mineral component of the asset. A close look at the transaction-prices approach reveals, however, a number of diYculties that need to be resolved.

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  • Among molluscs, the shell biomineralization process is controlled by a set of extracellular macromolecular components secreted by the calcifying mantle. In spite of several studies, these components are mainly known in bivalves from only few members of pteriomorph groups.

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  • The diet is the source of some 40 nutrients for human beings. These classically are divided into energy-yielding dietary components (carbohydrates, fats, and proteins), sources of essential and nonessential amino acids (proteins), essential unsaturated fatty acids (fats), minerals (including trace minerals), and vitamins (water-soluble and fat-soluble organic compounds) (see Shils et al . , 1999).

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  • The importance of fisheries in a country cannot only be measured by the contribution to the GDP, but one must also take into consideration that fisheries resources and products are fundamental components of human feeding and employment. Another aspect that makes fisheries resources important is the self renewable character. Unlike mineral resources, if the fishery resources or any other biological resources are well managed, their duration is pratically unlimited.

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  • The distinctive features of reproduction in squirrels are the lack of allometric influences on the duration of reproductive investment; the strong allometric influences on offspring mass; and a trade-off between number and size of young, suggesting an important developmental component to reproduction. Lengths of gestation and lactation do not vary with body size but neonatal and weaning mass do. Apparently, the major constraint on reproduction in squirrels is not resources per se (food, calories, minerals, or water) but rather the length of time such resources are available.

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  • Compiled TSPL programs are created by compiling a TSPL source module that is generated by SAS Enterprise Miner. They do not contain TSPL source statements. Compiled TSPL programs are shared object libraries that are stored inside the DBMS. SAS provides a collection of tools to simplify and automate the process of converting a TSPL source program to compiled TSPL. Some of these tools integrate with specific DBMS vendor tools.

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