ammonia cycle
41Nitrogen — carbon ← nitrogen → oxygen ↑ N ↓ P …
42Urea — Urea …
43Ocean thermal energy conversion — Temperature differences between the surface and 1000m depth in the oceans Ocean Thermal Energy Conversion (OTEC) uses the difference between cooler deep and warmer shallow or surface ocean waters to run a heat engine and produce useful work,… …
44Abiogenesis — Primordial soup redirects here. For the board game, see Primordial Soup (board game). Origin of life redirects here. For views on the origins of life outside the natural sciences, see Creation myth. Pre Cambrian stromatolites in the Siyeh… …
45biosphere — biospheric /buy euh sfer ik/, adj. /buy euh sfear /, n. 1. the part of the earth s crust, waters, and atmosphere that supports life. 2. the ecosystem comprising the entire earth and the living organisms that inhabit it. [1895 1900; < G Biosphäre; …
46Hypothetical types of biochemistry — are forms of biochemistry speculated to be scientifically viable but not proven to exist at this time. While the kinds of living beings we know on earth commonly use carbon for basic structural and metabolic functions, water as a solvent and DNA… …
47metabolic disease — ▪ pathology Introduction any of the diseases or disorders that disrupt normal metabolism, the process of converting food to energy on a cellular (cell) level. Thousands of enzymes participating in numerous interdependent metabolic pathways… …
48Nitrogen fixation — is the natural process, either biological or abiotic, by which nitrogen (N2) in the atmosphere is converted into ammonia (NH3).[1] This process is essential for life because fixed nitrogen is required to biosynthesize the basic building blocks of …
49Einstein refrigerator — The Einstein refrigerator is an absorption refrigerator which has no moving parts and requires only a heat source to operate. It was jointly invented in 1926 by Albert Einstein and his former student Leó Szilárd and patented in the US on November …
50Environmental impact of cleaning agents — Environmental impacts of cleaning agents are the consequences of chemicals contained in the products that are essential for their effectiveness. Bioactive molecules that are detrimental to the environment can either result from molecules that… …
