| Porter-Silber reaction | The basis of the 17-hydroxycorticosteroid test; C-21 adrenocorticosteroids, which contain a dihydroxyacetone group at carbons 19, 20, and 21, react with phenylhydrazine. (05 Mar 2000) |
|---|---|
| Porter-Silber chromogens test | A test, dependent on the Porter-Silber reaction, that is used as a measure of adrenocortical function and is performed on urine. Low values are seen in Addison's disease and hypopituitarism; high values are seen in Cushing's syndrome and extreme stress. Synonym: 17-OH-corticoids test, Porter-Silber chromogens test. (05 Mar 2000) |
| Silber, Robert | <person> U.S. Biochemist, *1915. See: Porter-Silber chromogens, Porter-Silber reaction, Porter-Silber chromogens test. (05 Mar 2000) |
| Baker, James Porter | <person> U.S. Physician, *1902. See: Charcot-Weiss-Baker syndrome. (05 Mar 2000) |
| Vinson, Porter | <person> U.S. Surgeon, 1890-1959. See: Plummer-Vinson syndrome. (05 Mar 2000) |
| porter | A membrane protein that functions to transport substances into and out of the cell. (09 Oct 1997) |
| Porter, Curt | <person> U.S. Biochemist, *1914. See: Porter-Silber chromogens, Porter-Silber reaction, Porter-Silber chromogens test. (05 Mar 2000) |
| Porter's fascia | The layer of fascia investing the infrahyoid muscles and contributing to the formation of the carotid sheath. Synonym: lamina pretrachealis, middle cervical fascia, Porter's fascia, pretracheal layer. (05 Mar 2000) |
| Porter, Thomas | <person> British scientist, 1860-1933. See: Ferry-Porter law. (05 Mar 2000) |
| Porter, William | <person> Irish surgeon, 1790-1861. See: Porter's fascia. (05 Mar 2000) |
| Ferry-Porter law | The critical fusion is directly proportional to the logarithm of the light intensity. (05 Mar 2000) |
| accelerated reaction | A response occurring in a shorter time than expected; the cutaneous manifestations occurring during the period between the second and tenth day following smallpox vaccination; because it is intermediate between a primary reaction and an immediate reaction, it is regarded as evidence of some degree of resistance. Synonym: vaccinoid reaction. (05 Mar 2000) |
| acid reaction | Any test by which an acid reaction is recognised such as the change of blue litmus paper to red, an excess of hydrogen ions over hydroxide ions in aqueous solution indicated by a pH value less than 7 (at 22캜). Compare: dissociation constant of water. (05 Mar 2000) |
| acute-phase reaction | <immunology, rheumatology> Refers to the changes in synthesis of certain proteins within the serum during an inflammatory response, which provides rapid protection for the host against microorganisms via non-specific defense mechanisms. It consists of fever, an increase in inflammatory humoral factors, and an increased synthesis by hepatocytes of a number of proteins or glycoproteins usually found in the plasma; the reaction is mediated by endogenous pyrogens, the hypothalamus, adrenal hormones, and other factors. (12 Jul 2000) |
| acute situational reaction | An acute emotional reaction related to extreme environmental stress. Synonym: acute situational reaction. (05 Mar 2000) |