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Selenium in Food and Health
Selenium is a contradictory nutrient. It has been called the essential poison—too
much of it in the diet can be toxic; too little can result in chronic, and sometimes
fatal, deficiency. Even health authorities have at times been confused. Although
today in the USA, as in most other countries, selenium appears among the trace... | | Earth Science: An Illustrated Guide to Science (Science Visual Resources)
"Earth Science: An Illustrated Guide to Science" is one of eight volumes of "Facts On File's" new "Science Visual Resources" set. Containing six sections, a comprehensive glossary, a Web site guide, and an index, Biology is an ideal learning tool for students and teachers of science. Full-colour diagrams,... | | Water Dynamics in Plant Production
The source of life is water. Life began in the
oceans, which represent the largest stock of water
on Earth. Much less water is stored below the land
surface in the form of fresh groundwater, amounting
to not quite 0.8% of the earth’s total water
reserves, while lakes and rivers combined only
contribute a further... |
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