| allelomorph | Synonym: allele. Origin: G. Allelon, reciprocally, + morphe, shape (05 Mar 2000) |
|---|---|
| allelomorphic | Relating to an allele. Synonym: allelomorphic. (05 Mar 2000) |
| allelomorphism | The state held in common by alleles. Synonym: allelomorphism. (05 Mar 2000) |
| allelopathy | <cell biology> The deleterious interaction between two organisms or cell types that are allogeneic to each other (the term is often applied loosely to interactions between xenogeneic organisms). Allelopathy is seen between different species of plant, between various individual sponges and between sponges and gorgonians. (18 Nov 1997) |
| allelotaxis | Development of an organ from a number of embryonal structures or tissues. Origin: G. Allelon, reciprocally, + taxis, an arranging (05 Mar 2000) |
| Allen video enhanced contrast | <procedure> A method for enhancing microscopic images pioneered by R D Allen. The digitised image has the background (an out of focus image of the same microscopic field with comparable unevenness of illumination etc.) subtracted and the contrast expanded to utilise the potential contrast range. Interestingly, it is possible to produce images of objects that are below the theoretical limit of resolution microtubules for example. (18 Nov 1997) |
| Allen's test | For phenol: upon the addition of 5 or 6 drops of hydrochloric acid and then 1 of nitric acid to the suspected fluid, a red colour develops. For strychnine: fluid is extracted with ether, which is then evaporated by means of "drop-by-drop" pipetting into a warmed porcelain dish or crucible; the residue is treated with a small bit of manganese dioxide and dilute sulfuric acid; a red-blue or violet colour develops if strychnine is present. Origin: A.H. Allen A test for radial or ulnar patency; either the radial or ulnar artery is digitally compressed by the examiner after blood has been forced out of the hand by clenching it into a fist; failure of the blood to diffuse into the hand when opened indicates that the artery not compressed is occluded. Origin: Edgar Van Nuys Allen (05 Mar 2000) |
| Allen, Alfred | <person> U.S. Chemist, 1846-1904. See: Allen's test. (05 Mar 2000) |
| Allen, Edgar | <person> U.S. Endocrinologist, 1892-1943. See: Allen-Doisy test, Allen-Doisy unit. (05 Mar 2000) |
| Allen, Edgar Van Nuys | <person> U.S. Physician, 1900-1961. See: Allen's test. (05 Mar 2000) |
| Allen, Willard | <person> U.S. Gynecologist, *1904. See: Corner-Allen test, Corner-Allen unit, Allen-Masters syndrome. (05 Mar 2000) |
| Allen-Doisy test | A test for oestrogenic activity; the material to be investigated is injected repeatedly into immature or spayed rats or mice; the disappearance of leukocytes from the vaginal smear and the appearance of cornified cells constitutes a positive reaction. (05 Mar 2000) |
| Allen-Doisy unit | The quantity of oestrogen capable of producing in a spayed mouse a characteristic change in the vaginal epithelium, namely, disappearance of leukocytes and appearance of cornified cells, as determined by a vaginal smear; equal approximately to one-half of an estrone unit. Synonym: mouse unit. (05 Mar 2000) |
| Allen-Masters syndrome | <syndrome> Pelvic pain resulting from an old laceration of the broad ligament received during delivery. (05 Mar 2000) |
| allergen | <immunology> An antigenic substance capable of producing immediate type hypersensitivity reaction (allergy). (06 Oct 1997) |