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.
twig 1. n. 1. A young shoot representing the current season's growth of a woody plant. 2. Any small, leafless branch of a woody plant. [Middle English, from Old English. ; see dwo-in Indo-European roots .].