Opacity (optics) Opacity is the measure of impenetrability to electromagnetic or other kinds of radiation, especially visible light. In radiative transfer, it describes the absorption and scattering of radiation in a medium, such as a plasma, dielectric, shielding material, glass, etc.
Answers.comÂ® is making the world better one answer at a time. during Calvin Benson cycle carbon dioxide from the air is used to produce glucose and other compounds.
The estrus (heat) cycle during the spring and summer lasts and average of 21 days. That is during each 21 day period one egg is ovulated. For an average of 5 days during that period the mare is receptive to stallions.This referred to as in or showing heat.Ovulation takes place approximately 24 hours prior to the end of the heat period. The mare is then unreceptive for the next 16 days followed by another heat period if the egg is not fertilized.The rest of the article will describe the hormonal changes that occur during the estrus cycle.vulation takes place approximately 24 hours prior to the end of the heat period. The mare is then unreceptive for the next 16 days followed by another heat period if the egg is not fertilized. The rest of the article will describe the hormonal changes that occur during the estrus cycle.