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See also External links A Catherine Asaro, around 2009 Isaac Asimov, before 1959 Margaret Atwood, 2015 Dafydd ab Hugh (born 1960) Alexander Abasheli (1884–1954) Edwin Abbott Abbott (1838–1926) Kōbō Abe (1924–1993) Robert Abernathy (1924–1990) Dan Abnett (born 1965) Daniel Abraham (born 1969) Forrest J Ackerman (1916–2008) Douglas Adams (1952–2001) Robert Adams (1932–1990) Ann ...
Gunn's novelette "Powder Keg" was the cover story for the April 1958 issue of IfJames Edwin Gunn (July 12, 1923 – December 23, 2020) was an American science fiction writer, editor, scholar, and anthologist.
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.
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.
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]
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 .
This list includes novels not marketed as SF but still considered to be substantially science fiction in content by some critics, such as Nineteen Eighty-Four. As such, it is an inclusive list, not an exclusive list based on other factors such as level of notability or literary quality.
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.