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They have been collected as The Business of Science Fiction. Malzberg was a regular contributor to the SFWA Bulletin published by the Science Fiction and Fantasy Writers of America. In 2013, articles he wrote for the Bulletin with Mike Resnick triggered a controversy about sexism among members of the association. Female authors strongly ...
In microbial nitrogen metabolism, the occurrence of hydrazine as an intermediate is rare. [36] Hydrazine has been proposed as an enzyme-bound intermediate in the nitrogenase reaction. [37] Recently, using detailed molecular analyses and combining complementary methods, Kartal and coworkers published strong evidence supporting the latter mechanism.
Recent results, however, show that HAO does not produce nitrite as a direct product of catalysis. This enzyme instead produces nitric oxide and three electrons. Nitric oxide can then be oxidized by other enzymes (or oxygen) to nitrite. In this paradigm, the electron balance for overall metabolism needs to be reconsidered. [7]
A large fraction of the chemical elements that occur naturally on the Earth's surface are essential to the structure and metabolism of living things. Four of these elements (hydrogen, carbon, nitrogen, and oxygen) are essential to every living thing and collectively make up 99% of the mass of protoplasm. [1]
Dissimilatory nitrate reduction to ammonium is a two step process, reducing NO 3 − to NO 2 − then NO 2 − to NH 4 +, though the reaction may begin with NO 2 − directly. [1] Each step is mediated by a different enzyme, the first step of dissimilatory nitrate reduction to ammonium is usually mediated by a periplasmic nitrate reductase.
The vocabulary includes words used in science fiction books, TV and film. A second category rises from discussion and criticism of science fiction, and a third category comes from the subculture of fandom. It describes itself as "the first historical dictionary devoted to science fiction", tracing how science fiction terms have developed over time.
Isaac Asimov, the biochemist and science fiction writer, suggested in 1981 that poly-lipids could form a substitute for proteins in a non-polar solvent such as methane. [51] Lakes composed of a mixture of hydrocarbons, including methane and ethane , have been detected on the surface of Titan by the Cassini spacecraft .
Kenneth Macrae MacLeod (born 2 August 1954) is a Scottish science fiction writer. His novels The Sky Road and The Night Sessions won the BSFA Award . MacLeod's novels have been nominated for the Arthur C. Clarke , Hugo , Nebula , Locus , and Campbell Memorial awards for best novel on multiple occasions.