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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]
The late 19th century witnessed a new generation of writers, such as J.-H. Rosny aîné, utilizing science and pseudoscience for purely fictional purposes. [15] This marked a significant departure from their predecessors, who employed the conjectural element as a pretext, following in the footsteps of Savinian Cyrano de Bergerac's utopian, Jonathan Swift's satires, and Camille Flammarion's ...
Dr. Mary Margaret Albright, Ph.D Dr. Richard "Dick" Solomon: anthropology physics The Adventures of Jimmy Neutron: Tim Curry (voice) Professor Finbarr Calamitous: science The Aquabats! Super Show! / The Aquabats: Parker Jacobs: Professor Monty Corndog: science Bagpuss: Oliver Postgate (voice) Professor Yaffle (Augustus Barclay Yaffle) unknown ...
Purines are biologically synthesized as nucleotides and in particular as ribotides, i.e. bases attached to ribose 5-phosphate.Both adenine and guanine are derived from the nucleotide inosine monophosphate (IMP), which is the first compound in the pathway to have a completely formed purine ring system.
A major theme of science fiction and of speculative biology is to convey a message of optimism or pessimism according to the author's worldview. [5] [6] Whereas optimistic visions of technological progress are common enough in hard science fiction, pessimistic views of the future of humanity are far more usual in fiction based on biology. [4]
Science fiction by genre (22 C, 3 P) Soft science fiction (4 C, 9 P) Solarpunk (2 C, 10 P) Space opera (17 C, 36 P) Speculative crime and thriller fiction (294 P)
As an emerging genre, slipstream has been described as nonrealistic fiction with a postmodern sensibility, exploring an awareness of societal and technological change and psychological breakdown previously shown by science fiction authors during the time of postmodernism, as well as poets and experimental authors in modernism.
Many of the most enduring science fiction tropes were established in Golden Age literature. Space opera came to prominence with the works of E. E. "Doc" Smith; Isaac Asimov established the canonical Three Laws of Robotics beginning with the 1941 short story "Runaround"; the same period saw the writing of genre classics such as the Asimov's Foundation and Smith's Lensman series.