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Purine is a heterocyclic aromatic organic compound that consists of two rings (pyrimidine and imidazole) fused together. It is water-soluble. Purine also gives its name to the wider class of molecules, purines, which include substituted purines and their tautomers. They are the most widely occurring nitrogen-containing heterocycles in nature. [1]
Isaac Asimov Presents The Great SF Stories 1 (1939) is an American collection of short stories, edited by Isaac Asimov and Martin H. Greenberg, originally published by DAW books in March 1979. [1] It contains science fiction stories selected by the editors that were published in the year 1939. The book is part of a 25 volume series.
The Light Fantastic: The Short Fiction Of Alfred Bester, Volume 1 Star Light, Star Bright is a collection of science fiction short stories by American writer Alfred Bester , first published in 1976.
The Hugo Winners was a series of books which collected science fiction and fantasy stories that won a Hugo Award for Short Story, Novelette or Novella at the World Science Fiction Convention between 1955 and 1982. Each volume was edited by American writer Isaac Asimov, who wrote the introduction and a short essay about each author featured in ...
Xanthine (/ ˈ z æ n θ iː n / or / ˈ z æ n θ aɪ n /, from Ancient Greek ξανθός xanthós ' yellow ' for its yellowish-white appearance; archaically xanthic acid; systematic name 3,7-dihydropurine-2,6-dione) is a purine base found in most human body tissues and fluids, as well as in other organisms. [2]
The stories were selected by Asimov, and the main selection criterion was the degree to which they influenced him when he was growing up in the 1930s. The prefatory material and individual introductions to the stories fill in the details about the early life of the child prodigy , which effectively makes the volume an autobiographical prequel ...
Science in science fiction is the study or of how science is portrayed in works of science fiction, including novels, stories, and films. It covers a large range of topics. Hard science fiction is based on engineering or the "hard" sciences (for example, physics, astronomy, or chemistry).
Isaac Asimov Presents The Great SF Stories 3 (1941) is an English language collection of science fiction short stories, edited by Isaac Asimov and Martin H. Greenberg. [1] [2] The series attempts to list the great science fiction stories from the Golden Age of Science Fiction. They date the Golden Age as beginning in 1939 and lasting until 1963.