... other essential nutrients such as dietary minerals
, essential fatty acids or essential amino ... Pharmacology
The History of Vitamin ... vitamin discovery at About.com
Vitamins and minerals
A Brief Update on Ubiquinone (Coenzyme Q10), ...
... be floating factories which could create copies of themselves. They could be programmed to perform some function (extracting fresh water, harvesting minerals
from seawater) for an investment that would be relatively small compared to the huge returns from the exponentially growing numbers of factories. ...
Competitive exclusion principle
... of the plankton (or short plankton paradox ): All plankton species live on a very limited number of resources, primarily solar energy and minerals
that are dissolved in the water. According to the competitive exclusion principle, only a small number of plankton species should be able to coexist ...
... is sterilized. Urea diffuses into the dialysing fluid, which does not contain the compound. However, concentrations of glucose, amino acids and minerals
are either similar to those of normal plasma to prevent loss, or higher than those of plasma to act as nutrient supplements. If a strong glucose ...
... the opposite effect to what was expected).
Main examples of homeostasis in mammals are as follows:
The regulation of the amounts of water and minerals
in the body. This is known as osmoregulation. This happens in the kidneys.
The removal of metabolic waste. This is known as excretion. This is done ...
... environment by producing their own organic compounds (see photosynthesis ). The fungus protects the alga against drying out and provides it with minerals
obtained from the substratum. If a cyanobacterium is present this can fix nitrogen , complementing the activities of the green alga.
... powers of the ocular (usually 10×) and the objective lenses being used.
To study the thin structure of metals (see metallography ) and minerals
, another type of microscope is used, where the light is reflected from the examined surface. The light is fed through the same objective using a ...
Origin of life
... of energy (e. g. simulated lightning or UV irradiation), "Wchtershuser systems" come with a built-in source of energy, sulfides of iron and other minerals
(e. g. pyrite). The energy released from redox reactions of these metal sulfides is not only available for the synthesis of organic molecules, but ...
... All of their functions of a sieve-tube element are carried out by its (much smaller but quite living) companion cell.
While movement of water and minerals
through the xylem is driven by negative pressures (tension) most of the time, movement through the phloem is driven by positive hydrostatic ...