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In chemical physics and physical chemistry, chemical affinity is the electronic property by which dissimilar chemical species are capable of forming chemical compounds. [1] Chemical affinity can also refer to the tendency of an atom or compound to combine by chemical reaction with atoms or compounds of unlike composition.
Hard science fiction is a category of science fiction characterized by concern for scientific accuracy and logic. [ 1 ] [ 2 ] [ 3 ] The term was first used in print in 1957 by P. Schuyler Miller in a review of John W. Campbell 's Islands of Space in the November issue of Astounding Science Fiction .
The electron affinity of molecules is a complicated function of their electronic structure. For instance the electron affinity for benzene is negative, as is that of naphthalene, while those of anthracene, phenanthrene and pyrene are positive. In silico experiments show that the electron affinity of hexacyanobenzene surpasses that of fullerene. [5]
The affinity constant, K a, is the inverse of the dissociation constant, K d. The strength of complex formation in solution is related to the stability constants of complexes , however in case of large biomolecules, such as receptor - ligand pairs, their interaction is also dependent on other structural and thermodynamic properties of reactants ...
Hard science fiction is a sub-genre of science fiction with an emphasis on the scientific accuracy of the "hard" sciences (for example, physics, astronomy, chemistry). In contrast soft science fiction explores the "soft" sciences (for example, anthropology, sociology, psychology).
The presence of the fatty acyl chain renders the molecules with a high surface activity and an ability to form micelles. [41] Thus, when secreted, these molecules bind to surfaces and to each other, thereby slowing the rate of diffusion away from the secreting organism and maintaining a relatively high local siderophore concentration.
Electron affinity can be defined in two equivalent ways. First, as the energy that is released by adding an electron to an isolated gaseous atom. The second (reverse) definition is that electron affinity is the energy required to remove an electron from a singly charged gaseous negative ion.
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).