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1. To bleed from the uterus less profusely than in flooding. 2. The menstrual discharge. 3. Movement of a liquid or gas; specifically, the volume of liquid or gas passing a given point per unit of time. In respiratory physiology, the symbol for gas flow is V and for blood flow is Q, followed by subscripts denoting location and chemical species. 4. In rheology, a permanent deformation of a body which proceeds with time. [A.S. flowan]
Bingham f. the f. characteristics exhibited by a Bingham plastic.
Doppler color f. a computer-generated color image produced by Doppler ultrasonography in which different directions of f. are represented by different hues. See Doppler ultrasonography.This technique is typically used to examine blood flow when evaluating heart disease. Where obstructions (for instance, arterial plaques) exist, blood flow will alter according to the principles of fluid mechanics. Eddies and reversals are readily apparent on the color image.
effective renal blood f. (ERBF) the amount of blood flowing to the parts of the kidney that are involved with production of constituents of urine.
effective renal plasma f. (ERPF) the amount of plasma flowing to the parts of the kidney that have a function in the production of constituents of urine; the clearance of substances such as iodopyracet and p-aminohippuric acid, assuming that the extraction ratio in the peritubular capillaries is 100%.
forced expiratory f. (FEF) expiratory f. during measurement of forced vital capacity; subscripts specify the exact parameter measured, e.g., peak instantaneous f., the instantaneous f. at some specified point on the curve of volume expired versus time, or on the flow-volume curve, the mean f. between two expired volumes.
gene f. changes over time in the genetic composition of a population as a result of migration rather than of mutation and selection.
laminar f. the relative motion of elements of a fluid along smooth parallel paths, which occurs at lower values of Reynolds number.
newtonian f. the type of f. characteristic of a newtonian fluid.
peak expiratory f. the maximum f. at the outset of forced expiration, which is reduced in proportion to the severity of airway obstruction, as in asthma.
shear f. a f. of a material in which parallel planes in the material are displaced in a direction parallel to each other.
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