| cell determination | The process by which embryonic cells, previously undifferentiated, take on a specific developmental character. Although the mechanism is not fully understood, homeotic proteins coded for by certain gene sequences (the homeobox) appear to trigger the process. Genes for homeotic proteins show remarkable similarity among species. See: morphogenesis, induction, evocator. (05 Mar 2000) |
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| blood pressure determination | Techniques for measuring blood pressure. (12 Dec 1998) |
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| blood volume determination | Method for determining the circulating blood volume by introducing a known quantity of foreign substance into the blood and determining its concentration some minutes later when thorough mixing has occurred. From these two values the blood volume can be calculated by dividing the quantity of injected material by its concentration in the blood at the time of uniform mixing. Generally expressed as cubic centimeters or liters per kilogram of body weight. (12 Dec 1998) |
| gastric acidity determination | Gastric analysis for determination of free acid or total acid. (12 Dec 1998) |
| comprehensive wetland determination | <ecology> A type of wetland determination that is based on the strongest possible evidence, requiring the collection of quantitative data for all three wetland identification criteria. (05 Jan 1998) |
| sex determination | Determination of the sex of a foetus in utero by identification of foetal chromosomes. (05 Mar 2000) |
| sex determination (analysis) | Validation of the sex of an individual by inspection of the gonads and/or by genetic tests. (12 Dec 1998) |
| sex determination (genetics) | Process in a given organism, by which the sex genotype is fixed. In humans, sex is established at the time of fertilization by the presence or absence of the y chromosome. (12 Dec 1998) |
| determination | <cell biology> The committment of a cell to a particular path of differentiation, even though there may be no morphological features that reveal this determination. Generally irreversible, but in the case of imaginal discs of Drosophila that are maintained by serial passage, transdetermination may occur. (18 Nov 1997) |
| eligibility determination | Criteria to determine eligibility of patients for medical care programs and services. (12 Dec 1998) |
| faecal fat determination | <investigation> A test that measures the amount of fat in the stool and the percentage of dietary fat that is absorbed. This test is used to evaluate potential fat malabsorption syndromes. Stools are collected for 24 hours. Normal values include less than 7 grams of fat per 24 hours, based on a diet of 100 grams of fat per day for 3 days before the test. Decreased fat absorption can be seen in biliary stricture, biliary cancer, celiac sprue, cholelithiasis, chronic pancreatitis, Crohn's disease, cystic fibrosis, acute pancreatitis, pancreatic cancer, radiation enteritis, short bowel syndromes (post surgical) and Whipple's disease. (27 Sep 1997) |
| T-cell-rich, B-cell lymphoma | <tumour> A B-cell lymphoma in which more than 90% of the cells are of T-cell origin, masking the large cells that form the neoplastic B-cell component. See: adult T-cell lymphoma. (05 Mar 2000) |
| absorption cell | A small glass chamber with parallel sides, in which absorption spectra of solutions can be obtained. (05 Mar 2000) |
| acid cell | One of the cell's of the gastric glands; it lies upon the basement membrane, covered by the chief cell's, and secretes hydrochloric acid that reaches the lumen of the gland through fine intracellular and intercellular canals (canaliculi). Synonym: acid cell, oxyntic cell. (05 Mar 2000) |
| acidophil cell | A cell whose cytoplasm or its granules stain with acid dyes. (05 Mar 2000) |
| acinar cell | Any secreting cell lining an acinus, especially applied to the cell's of the pancreas that furnish pancreatic juice and enzymes to distinguish them from the cell's of ducts and the islets of Langerhans. Synonym: acinous cell. (05 Mar 2000) |