TABLE OF CONTENTS Symbol for mega-, one million times or 10 6.
Symbol for milli-, one-thousandth or 10 ?3.
Maximum admissible concentration.
A bacterial medium that is selective for coliforms, used in bacteriological examination of water and waste water. It consists of salts, peptone, lactose, sodium chloride and a pH indicator. Coliform bacteria ferment this broth at 37 C to produce a gas and an acid which is shown by the solution changing from purple to yellow, with a bubble of gas collected in a small Durham tube. At 44 C E. coli is the dominant coliform that produces acid plus gas in MacConkey s broth.
(1) A screenings disintegrator. (2) A garbage grinder.
Seaweeds.
The larger organisms in soil, including plant roots, larger insects and earthworms. Compare microbiota, mesobiota.
In encapsulation of hazardous waste, the waste is contained within the macro-structure of the encapsulating material, e.g. the waste is held within the pores of a cement mortar structure. Compare microencap sulation.
Small animals without a backbone that can be seen by the unaided eye, e.g. species of flies, worms, leeches, snails, beetles, etc. These animals can be useful in describing the level of pollution in a river. See biotic index.
Aquatic plants, growing in or near water. They are beneficial because they provide cover for fish, substrate for aquatic invertebrates and they also produce oxygen. See
