Doublet
(Science: microscopy) two simple lens elements cemented together, for the purpose of giving spherical and chromatic corrections. An achromatic doublet may be composed of a positive crown-glass lens and a negative flint-glass lens. The errors of one element are made to compensate those of the other element.
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..
Plant cells have plastids essential in photosynthesis. They also have an additional layer called cell wall on their cell..
The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..
This tutorial describes the sigmoid curve, annual plant growth, tree growth, human growth, and insect growth as the grow..
Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..