purify oxygen
41Carbon sink — A carbon sink is reservoir of carbon that accumulates and stores carbon for an indefinite period. The main natural sinks are: # Absorption of carbon dioxide by the oceans # Photosynthesis by plants and algae The process by which carbon sinks… …
42Staphylococcus aureus — Scanning electron micrograph of S. aureus, 20,000 times enlargement, false color added Scientific classification Domain: Bacteria …
43Organisms used in water purification — A flowering water purifying plant (Iris pseudacorus) At present, several species of water purifying plants, bacteria, and fish are used in water purification, improving efficiency and/or ecosystem support. Contents …
44Wood economy — The existence of a wood economy, or more correctly, a forest economy (since in many countries a bamboo economy predominates), is a prominent matter in many developing countries as well as in many other nations with temperate climate and… …
45solution — solutional, adj. /seuh looh sheuhn/, n. 1. the act of solving a problem, question, etc.: The situation is approaching solution. 2. the state of being solved: a problem capable of solution. 3. a particular instance or method of solving; an… …
46steroid — /stear oyd, ster /, Biochem. n. 1. any of a large group of fat soluble organic compounds, as the sterols, bile acids, and sex hormones, most of which have specific physiological action. adj. 2. Also, steroidal /sti royd l, ste /. pertaining to or …
47tellurium — /te loor ee euhm/, n. Chem. a rare, lustrous, brittle, crystalline, silver white element resembling sulfur in its properties, and usually occurring in nature combined with gold, silver, or other metals of high atomic weight: used in the… …
48air — I (New American Roget s College Thesaurus) I n. atmosphere (See air); mien, bearing, appearance; tune, melody (See music). v. t. ventilate (See air); proclaim, broadcast (See publication). II Earth s atmosphere Nouns 1 …
49Protein — Proteins are large organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid residues. The sequence of amino acids in a protein is defined by …
50Urea — Urea …
