| SVD | single vessel disease; singular value decomposition; small vessel disease; spontaneous vaginal deliv... |
|---|---|
| SBP | Spontaneous Bacterial Peritonitis |
| NSD | Nairobi sheep disease; neonatal staphylococcal disease; neurosecretory dysfunction; night sleep depr... |
| NSFTD | normal spontaneous full-term delivery |
| NSVD | normal spontaneous vaginal delivery |
| Douglas graft | An obsolete eponym for sieve graft. (05 Mar 2000) |
|---|---|
| Douglas, James | <person> Scottish anatomist in London, 1675-1742. See: Douglas abscess, Douglas' cul-de-sac, Douglas' fold, Douglas' line, Douglas' pouch, cavum douglasi. (05 Mar 2000) |
| Douglas, John | <person> Irish obstetrician, 1777-1850. See: Douglas' spontaneous evolution, Douglas mechanism. (05 Mar 2000) |
| Douglas' line | A crescentic line, not always clearly defined, which marks the lower limit of the posterior layer of the sheath of the rectus abdominis muscle. Synonym: linea arcuata vaginae musculi recti abdominis, Douglas' line, linea saemicircularis, saemicircular line. (05 Mar 2000) |
| Douglas mechanism | Mechanism of spontaneous evolution in transverse lie; extreme lateral flexion of the vertebral column with birth of the lateral aspect of thorax before the buttocks. (05 Mar 2000) |
| douglas' pouch | A sac or recess formed by a fold of the peritoneum. (12 Dec 1998) |
| Torre, Douglas | <person> U.S. Dermatologist, *1919. See: Torre's syndrome, Muir-Torre syndrome. (05 Mar 2000) |
| biologic evolution | Biologic evolution was contrasted with cultural evolution in 1968 by A.G. Motulsky who pointed out that biologic evolution is mediated by genes, shows a slow rate of change, employs random variation (mutations) and selection as agents of change, new variants are often harmful, these new variants are transmitted from parents to offspring, the mode of transmission is simple, complexity is achieved by the rare formation of new genes by chromosome duplication, biologic evolution occurs with all forms of life, and the biology of humans requires cultural evolution. See Cultural evolution. (12 Dec 1998) |
| chemical evolution | The theory of the process by which life arose from inorganic matter. (05 Mar 2000) |
| coincidental evolution | <molecular biology> The tendency for the same mutation to arise simultaneously in all copies of a gene which has been duplicated. (09 Oct 1997) |
| concerted evolution | The ability of two related genes to evolve together as though constituting a single locus. Synonym: coincidental evolution. (05 Mar 2000) |
| convergent evolution | The process where two unrelated structures in unrelated organisms evolve to perform similar functions. (The structures are called analogous structures.) For example: the wings of bats, birds, and insects evolved separately from each other but all are used to perform the function of flying. For another example: the complex eyes of vertebrates, cephalopods (squid and octopus), cubozoan jellyfish, and arthropods (insects, spiders, crustaceans) evolved separately, but all perform the function of vision. (09 Oct 1997) |
| cultural evolution | The continuous developmental process of a culture from simple to complex forms and from homogeneous to heterogeneous qualities. (12 Dec 1998) |
| saltatory evolution | The theory that evolution of a new species from an older one may occur as a large jump, such as a major repatterning of chromosomes, rather than by gradual accumulation of small steps or mutations. Compare: emergent evolution. (05 Mar 2000) |
| Darwinian evolution | The proposition that the phylogeny of all species is wholly ascribable to the combined effects of random variation (mutation) in genotypes of the members of a stock as a result of the operation of undirected accidents with consequences to their phenotypes and the operation of preferential (but by no means certain) survival of those resulting phenotypes most suited to survive in the contemporary environment. The proposed system survives largely because of genetic factors that avidly conserve the ontogeny of the stock. (05 Mar 2000) |