| Simpson uterine sound | A slender flexible metal rod used to calibrate or dilate the cervical canal, or to hold the uterus in various positions during gynecologic surgery. (05 Mar 2000) |
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| Simpson's forceps | An obstetrical forceps. (05 Mar 2000) |
| Simpson,Sir James | <person> Scottish obstetrician, 1811-1870. See: Simpson uterine sound, Simpson's forceps. (05 Mar 2000) |
| Sims uterine sound | A slender flexible sound with a small projection about 7 cm from its tip, used to estimate the size and caliber of the uterine cavity. (05 Mar 2000) |
| Sims' position | A position to facilitate a vaginal examination, the patient lying on the side with the under arm behind the back, the thighs flexed, the upper one more than the lower. Synonym: English position, lateral recumbent position, semiprone position. (05 Mar 2000) |
| Sims, J Marion | <person> U.S. Gynecologist, 1813-1883. See: Sims' position, Sims uterine sound. (05 Mar 2000) |
| simulated annealing | <molecular biology> In the biosciences, this refers to using computers to model how complementary strands of DNA or RNA will link via hydrogen bonds to form a double-stranded molecule, or how a protein sequence will fold up and make hydrogen bonds with itself to form a more convoluted molecule. (09 Oct 1997) |
| simulated hypertrophy | Increased size of a part due to continued growth unrestrained by attritions, as is seen in the case of the teeth of certain animals when the opposing teeth have been destroyed. (05 Mar 2000) |
| simulation | Imitation; said of a disease or symptom that resembles another, or of the feigning of illness as in factitious illness or malingering; in radiation therapy, using a geometrically similar radiographic system or computer to plan the location of therapy ports. Origin: L. Simulatio, fr. Simulo, pp. -atus, to imitate, fr. Similis, like (05 Mar 2000) |
| simulator | An apparatus designed to produce effects simulating those of specific environmental conditions; used in experimentation and training. (05 Mar 2000) |
| simuliidae | Several species of the genus simulium (family simuliidae) that act as intermediate hosts (vectors) for the parasitic disease onchocerciasis. (12 Dec 1998) |
| Simulium | A genus of biting gnats or midges, the black flies, humpbacked flies, or buffalo gnats in the dipteran family Simuliidae. The aquatic larvae require swift-flowing streams or highly oxygenated waters for their development, a critical epidemiological factor in the role of these flies as disease vectors. In Central and South America, Mexico, and across central Africa, various species transmit Onchocerca volvulus, agent of human onchocerciasis; in North America, Onchocerca gutturosa and other onchocercid infections of cattle, horses, and various wild ruminants are transmitted by other black flies. Synonym: Eusimulium. Origin: L. Simulo, to simulate (05 Mar 2000) |
| Simulium damnosum | Species that is an important vector of onchocerciasis in central Africa. (05 Mar 2000) |
| Simulium neavei | Species that is an important vector of onchocerciasis in eastern Africa where its larvae and pupae are attached to the shells of crabs of the genus Potamonantes. (05 Mar 2000) |
| Simulium ochraceum | Species that is a vector of human onchocerciasis in Central America. (05 Mar 2000) |