Regel was an extremely prolific scientist and author. In addition to writing a number of major reference works in botany, he published 3101 articles in academic journals.
A solution is a homogenous mixture of two or more substances that exist in a single phase. There are two main parts to any solution. The solute is the component of a solution that is dissolved in the solvent; it is usually present in a smaller amount than the solvent. The solvent is the component into which the solute is dissolved, and it is usually present in greater concentration. For example, in a solution of salt water, salt is the solute and water is the solvent. In solutions where water is the solvent, the solution is referred to as an aqueous solution. A solution does not have to involve liquids. For instance, air is a solution that consists of nitrogen, oxygen, carbon dioxide, and other trace gases, and solder is a solution of lead and tin.
clearing medium a substance to render histologic specimens transparent. contrast medium a radiopaque substance used in radiography to permit visualization of internal body structures. culture medium see under C. dioptric media refracting media. disperse medium dispersive m. dispersion medium dispersive m. dispersive medium the continuous phase of a colloid system; the medium in which the particles of the disperse phase are distributed, corresponding to the solvent in a true solution.