| Hill constant | A measure of cooperativity in a binding process. A Hill coefficient of 1 indicates independent binding, a value of greater than 1 shows positive cooperativity binding of one ligand facilitates binding of subsequent ligands at other sites on the multimeric receptor complex. Worked out originally for the binding of oxygen to haemoglobin (Hill coefficient of 2.8). (18 Nov 1997) |
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| Hill operation | Repair of hiatus hernia; narrowing the oesophagogastric junction and attaching it to the right medial arcuate ligament. (05 Mar 2000) |
| hill plot | A method which is used to find out how many binding sites of a particular type are present on a given protein molecule. The Hill plot does this by graphical representation of the molecule. (09 Oct 1997) |
| Hill reaction | <plant biology> Reaction, first demonstrated by Robert Hill in 1939, in which illuminated chloroplasts evolve oxygen when incubated in the presence of an artificial electron acceptor (e.g. Ferricyanide). The reaction is a property of photosystem II. (11 Jan 1998) |
| Hill's equation | The equation,y(1-y) = [S]n/Kd, where y is the fractional degree of saturation, [S] is the binding ligand concentration, n is the Hill coefficient, and Kd is the dissociation constant for the ligand. The Hill coefficient is a measure of the cooperativity of the protein; the larger the value, the higher the cooperativity. This coefficient cannot be higher than the number of binding sites. For the oxygen binding curve of haemoglobin, an association constant, Ka, is used and the equation becomes y/(1-y) = Ka[S]n. For human blood, n equals 2.5. Compare: Hill plot. (05 Mar 2000) |
| Hill's phenomenon | <clinical sign> In aortic insufficiency, greater systolic blood pressure in the legs than in the arms; normal arterial systolic pressure in the leg is 10 to 20 mm of Hg above that in the arm, whereas in aortic insufficiency the difference may be 60 to 100 mm of Hg. Synonym: Hill's phenomenon. (05 Mar 2000) |
| Hill's sign | <clinical sign> In aortic insufficiency, greater systolic blood pressure in the legs than in the arms; normal arterial systolic pressure in the leg is 10 to 20 mm of Hg above that in the arm, whereas in aortic insufficiency the difference may be 60 to 100 mm of Hg. Synonym: Hill's phenomenon. (05 Mar 2000) |
| Hill, Archibald | <person> English biophysicist and Nobel laureate, 1886-1977. See: Hill's equation, Hill plot. (05 Mar 2000) |
| Hill, Harold | <person> 20th century U.S. Radiologist. See: Hill-Sachs lesion. (05 Mar 2000) |
| Hill, Lucius | <person> U.S. Thoracic surgeon, *1921. See: Hill operation. (05 Mar 2000) |
| Hill, Robert | <person> British plant physiologist, *1899. See: Hill reaction. (05 Mar 2000) |
| Hill, Sir Leonard Erskine | <person> English physiologist, 1866-1952. See: Hill's sign, Hill's phenomenon. (05 Mar 2000) |
| hill-sachs deformity | <radiology> Indentation or groove on posterolateral aspect of humeral head, probably due to compression of humeral head on posterior lip of glenoid, suggests repeated or chronic anterior shoulder dislocation, may occur after one episode of dislocation associated with: Bankhart lesion of glenoid (12 Dec 1998) |
| Hill-Sachs lesion | An irregularity seen in the head of the humerus following dislocation of the shoulder; caused by impaction of the head of the humerus against the edge of the glenoid. (05 Mar 2000) |
| hilling | The act or process of heaping or drawing earth around plants. Source: Websters Dictionary (01 Mar 1998) |
Synonyms : His-tRNA Ligase, Histidyl-tRNA Synthetase, Jo-1 Antigen, Antigen, Jo-1, His tRNA Ligase, Histidine tRNA Ligase, Histidyl tRNA Synthetase, Jo 1 Antigen, Ligase, His-tRNA, Ligase, Histidine-tRNA, Synthetase, Histidyl-tRNA
Synonyms :
Synonyms : Histidinolphosphatase
Synonyms : Histiocyte
Synonyms : Disorder, Malignant Histiocytic, Disorders, Malignant Histiocytic, Histiocytic Disorder, Malignant, Malignant Histiocytic Disorder, Malignant Histiocytic Disorders
| hip joint |
hip: the ball-and-socket joint between the head of the femur and the acetabulum
출처: wordnet.princeton.edu/perl/webwn
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| histiocytic medullary reticulosis |
a fatal hereditary disorder transmitted as an autosomal recessive trait, characterized by anemia, granulocytopenia, thrombocytopenia, intense phagocytosis of red blood cells, diffuse proliferation of histiocytes of various organs, and enlargement of the liver, spleen, and lymph nodes. Called also familial hemophagocytic r., familial histiocytic r., and Omenn's syndrome.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| high-performance liquid chromatography |
high-pressure liquid chromatography, (HPLC) a type of automated chromatography in which the mobile phase is a liquid, which is forced under high pressure through a column packed with a sorbent. As in gas chromatography, a detector at the end of the column coupled to a chart recorder graphs the sample efflux. Various separation methods, including adsorption, gel filtration, ion-exchange, and partition, are used.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| Hibbs' operation |
a spinal fusion operation done by fracturing the spinous processes of the vertebrae and pressing the tip of each downward to rest in the denuded area caused by the fracture of its elbow below.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| high energy bond |
a chemical bond the hydrolysis of which yields high levels of free energy; such bonds involve phosphate (high energy phosphate b.) or sulfur (high energy sulfur b.) or other mixed anhydride types of chemical structures.
출처: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| HI | a high place |
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| HI | a state of altered consciousness induced by alcohol or narcotics |
| HI | a state of sustained elation |
| HI | an air mass of higher than normal pressure |
| HI | happy and excited and energetic |
| HI | slightly and pleasantly intoxicated from alcohol or a drug (especially marijuana) |
| HI | used of the smell of game beginning to taint |
| HI | (literal meanings) being at or having a relatively great or specific elevation or upward extension (sometimes used in combinations like `knee-high') |
| HI | greater than normal in degree or intensity or amount |
| HI | used of sounds and voices |
| HI | standing above others in quality or position |
| HI | at a great altitude |