- Industry: Printing & publishing
- Number of terms: 178089
- Number of blossaries: 0
- Company Profile:
McGraw Hill Financial, Inc. is an American publicly traded corporation headquartered in Rockefeller Center in New York City. Its primary areas of business are financial, publishing, and business services.
A compound containing the –ONC group and derived from fulminic acid, HONC. Fulminates are isomeric with cyanates; that is, cyanates have the same atoms but in different arrangement, –OCN.
Industry:Science
A compound containing the –SCN group, typically a salt or ester of thiocyanic acid (HSCN). Thiocyanates are bonded through the sulfur(s) and have the structure R–S–C≡N. They are isomeric with the isothiocyanates, R–N=C≡S, which are the sulfur analogs of isocyanates (–NCO). The thiocyanates may be viewed as structural analogs of the cyanates (–OCN), where the oxygen (O) atom is replaced by a sulfur atom.
Industry:Science
A compound formed when one or more of the hydrogen atoms of an acid are replaced by one or more cations of the base. The common example is sodium chloride in which the hydrogen ions of hydrochloric acid are replaced by the sodium ions (cations) of sodium hydroxide. There is a great variety of salts because of the large number of acids and bases which has become known.
Industry:Science
A compound in which carbohydrate (sugar) is covalently linked to protein. The carbohydrate may be in the form of monosaccharides, disaccharides, oligosaccharides, or polysaccharides, and is sometimes referred to as glycan. The sugar may be linked to sulfate or phosphate groups. One to two hundred glycan units may be present in different glycoproteins. Therefore, the carbohydrate content of these compounds varies markedly, from 1% (as in the collagens), to 60% (in certain mucins), to >99% (in glycogen).
Industry:Science
A compound in which two or more metal atoms are bonded to one another. Metal cluster compounds bridge the gap between the solid-state chemistry of the metals—or their lower-valent oxides, chalcogenides, and related salts—and the complexes of the metals in which each metal ion is completely surrounded by and bonded to a set of ligands or ions. The latter group comprises the classical coordination chemistry of metal ions.
Industry:Science
A compound that is composed of only carbon and hydrogen atoms and contains three or more rings arranged topologically so as to enclose a volume of space. In general, the “hole” within a cage hydrocarbon is too small to accommodate even a proton. The carbon frameworks of many cage hydrocarbons are quite rigid. Consequently, the geometric relationships between substituents on the cage are well defined. This quality makes these compounds exceptionally valuable for testing concepts concerning bonding, reactivity, structure-activity relationships, and structure-property relationships.
Industry:Science
A compound that is made up of two or more amino acids joined by covalent bonds which are formed by the elimination of a molecule of H<sub>2</sub>O from the amino group of one amino acid and the carboxyl group of the next amino acid. Peptides larger than about 50 amino acid residues are usually classified as proteins.
Industry:Science
A compound, also known as 5-hydroxytryptamine (5-HT), derived from tryptophan, an indole-containing amino acid. It is widely distributed in the animal and vegetable kingdoms. In mammals it is found in gastrointestinal enterochromaffin cells, in blood platelets, and in brain and nerve tissue. Its presence in blood plasma is probably due to disruption of platelets during manipulation of blood in the laboratory. Low levels are found in urine, but metabolic breakdown products, particularly 5-hydroxyindoleacetic acid (5-HIAA), are found. Serotonin is a local vasoconstrictor, plays a role in brain and nerve function and in regulation of gastric secretion and intestinal peristalsis, and has pharmacologic properties.
Industry:Science
A comprehensive and life-cycle assessment of the effectiveness and cost of competing system designs, in order to choose the best candidate. System design evaluation is essential within the systems engineering process. It should be embedded appropriately within the process and then pursued continuously as system design and development progress. This article focuses on (1) the placement of design evaluation within the systems engineering process, (2) the evaluation factors that underpin system design evaluation, and (3) the system selection decision.
Industry:Science
A computer or computational device in which the problem variables are represented as continuous, varying physical quantities. An analog computer implements a model of the system being studied. The physical form of the analog may be functionally similar to that of the system, but more often the analogy is based solely upon the mathematical equivalence of the interdependence of the computer variables and the variables in the physical system.
Industry:Science
