Speciation can be defined as the distribution of an element among defined chemical species in a system, and speciation analysis as the analytical activities of identifying and/or measuring the quantities of one or more individual chemical species in a sample. 1.3 Structural aspects of speciation: The definitions of species and speciation of elements are based on several different levels of atomic and molecular structure where species differences are manifest.
Noun. 1. rickshaw-a small two-wheeled cart for one passenger; pulled by one person. jinrikisha, ricksha. cart-a heavy open wagon usually having two wheels and drawn by an animal.oun. 1. rickshaw-a small two-wheeled cart for one passenger; pulled by one person. jinrikisha, ricksha. cart-a heavy open wagon usually having two wheels and drawn by an animal.
rake 1. (rÄk) n. 1. A long-handled implement with a row of projecting teeth at its head, used especially to gather leaves or to loosen or smooth earth. 2. A device that resembles such an implement. v. raked, rakÂ·ing, rakes. v.tr. 1. a. To gather or move with or as if with a rake: rake leaves into a pile; rake in the gambling chips.