Hist: From 1 Different Sources
(histio-, histo-) combining form denoting tissue.
The defense substance responsible for most inflammation. It is synthesized from the amino acid histidine and is secreted by mast cells, basophils, and blood platelets. It stimulates vasodilation, capillary permeability, muscle contraction of the bronchioles, secretions of a number of glands, and attracts eosinophils, the white blood cells that are capable of moderating the inflammation. Mast cell histamine release is what usually causes allergies.... histamine
A mycotic disease caused by the dimorphic fungi Histoplasma capsulatum and H. duboisei. The former primarily affects the lungs and is acquired by inhalation of spores in bat droppings (often in caves) and the latter affects the skin and is restricted to West Africa.... histoplasmosis
The study of the minute structure of the tissues using special staining processes which are combined with electron and light microscopy. The specialty is sta?ed by medically quali?ed pathologists (histologists) and scienti?cally quali?ed technicians.... histology
An amino acid from which HISTAMINE is derived.... histidine
See DERMATOFIBROMA.... histiocytoma
A graphic representation of the frequency distribution of a variable. Rectangles are drawn in such a way that their bases lie on a linear scale, representing different intervals, and their heights are proportional to the frequencies of the values within each of the intervals.... histogram
The progressive development of a disease that runs its course without treatment. 1. Stage of susceptibility2. Stage of presymptomatic 3. Stage of clinical disease 4. Stage of disability/resolution Necator americanus See hookworm.... natural history of di sease
See H-receptor antagonists.... histamine-receptor antagonists
A rare childhood disease in which there is an overgrowth of a type of tissue cell called a histiocyte. The cause is unknown, but histiocytosis X probably results from a disturbance of the immune system. In the mildest form, rapid cell growth occurs in 1 bone only, usually the skull, a clavicle, a rib, or a vertebra, causing swelling and pain. In the most severe, and least common, form, there is a rash and enlargement of the liver, spleen, and lymph nodes.... histiocytosis x
A branch of histology concerned with the effects of disease on the microscopic structure of tissues.... histopathology
The process by which a doctor learns from patients the symptoms of their illnesses and any previous disorders. (See also diagnosis.)... history-taking
n. an enzyme, widely distributed in the body, that is responsible for the inactivation of histamine.... histaminase
a derivative of *histamine that was formerly used to test for acid secretion in the stomach in conditions involving abnormal gastric acid secretion, such as *Zollinger-Ellison syndrome.... histamine acid phosphate
n. a fixed *macrophage, i.e. one that is stationary within connective tissue.... histiocyte
n. any of a group of diseases in which there are abnormalities in certain large phagocytic cells (*histiocytes) due to (1) abnormal storage of fats, as in *Gaucher’s disease; (2) inflammatory disorders, as in *Langerhans cell histiocytosis, which includes disorders previously called histiocytosis X; or (3) malignant proliferation of histiocytes.... histiocytosis
n. the study of the identification and distribution of chemical compounds within and between cells, by means of stains, indicators, and light and electron microscopy. —histochemical adj.... histochemistry
n. the form of *compatibility that depends upon tissue components, mainly specific glycoprotein antigens in cell membranes. A high degree of histocompatibility is necessary for a tissue graft or organ transplant to be successful. —histocompatible adj.... histocompatibility
n. the formation of tissues.... histogenesis
adj. 1. resembling normal tissue. 2. composed of one type of tissue.... histoid
n. a simple protein that combines with a nucleic acid to form a *nucleoprotein.... histone
n. a genus of parasitic yeastlike fungi. The species H. capsulatum causes the respiratory infection *histoplasmosis.... histoplasma
n. a preparation of antigenic material from a culture of the fungus Histoplasma capsulatum, used to test for the presence of the disease *histoplasmosis by subcutaneous injection.... histoplasmin
adj. poisonous to tissues: applied to certain substances and conditions.... histotoxic
overgrowth of cells of the *reticuloendothelial system. This includes disorders previously called histiocytosis X, including eosinophilic granuloma, Hand–Schüller–Christian disease, and Letterer–Siwe disease. [P. Langerhans (1847–88), German physician and anatomist]... langerhans cell histiocytosis
see MHC.... major histocompatibility complex
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