| AVT | Allen vision test; arginine vasotocin; Aviation Medicine Technician |
|---|---|
| c.gl. | correction with glasses |
| s.gl. | without correction without glasses |
| ACF | accessory clinical findings; acute care facility; anterior cervical fusion; area correction factor; ... |
| c | gl correction with glasses |
| CF | Correction Factor |
|---|---|
| AC | attenuation correction |
| aperture correction | <microscopy> An electronic process used in some high-resolution video cameras and monitors that compensates for the loss in sharpness of detail due to the finite dimensions (aperture) of the scanning beam. (05 Aug 1998) |
|---|---|
| correction | A setting right, as the provision of specific lenses for the improvement of vision or an arbitrary adjustment made in values or devices in performance of experimental procedures. Origin: L. Correctio = straightening out, amendment (18 Nov 1997) |
| correction collar | <microscopy> An adjustment collar provided on some high-numerical aperture, microscope objective lenses. Rotation of the collar adjusts the height of certain lens elements in the objective lens to compensate for variations in coverslip thickness or immersion media. at high numerical apertures, even a small deviation of the coverslip thickness (by as little as a few micrometres in some cases), or refractive index of the immersion medium from the designated standard, can introduce significant aberrations. (05 Aug 1998) |
| spontaneous correction of placenta previa | The upward "migration" of the placenta away from the internal os by the differential growth rates of upper and lower uterine segments. (05 Mar 2000) |
| occlusal correction | The correction of malocclusion, by whatever means is employed, elimination of disharmony of occlusal contacts. (05 Mar 2000) |
| Allen, Alfred | <person> U.S. Chemist, 1846-1904. See: Allen's test. (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, 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-Masters syndrome | <syndrome> Pelvic pain resulting from an old laceration of the broad ligament received during delivery. (05 Mar 2000) |
| 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 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, Willard | <person> U.S. Gynecologist, *1904. See: Corner-Allen test, Corner-Allen unit, Allen-Masters syndrome. (05 Mar 2000) |
| chalcone michael allen | An organic molecule prepared by aldol condensation of acetophenone andbenzaldehyde. (09 Oct 1997) |
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