Membrane-bound cavity within a cell.
validity of a measurement
Expression of the degree to which a measurement measures what it purports to measure.
validity of a study
Degree to which the inferences drawn, especially generalizations extending beyond the study sample, are warranted when account is taken of the study methods, the representativeness of the study sample, and the nature of the population from which it is drawn.
Decrease of the caliber of the blood vessels leading to a decreased blood flow.
Increase in the caliber of the blood vessels, leading to an increased blood flow.
See cloning vector
Substance(s) used to formulate active ingredients for administration or use.
Note: In this context, it is a general term for solvents, suspending agents, etc.
Irregular heartbeat characterized by uncoordinated contractions of the ventricle.
Substance intended to kill intestinal worms.
virtually safe dose (VSD)
Human exposure over a lifetime to a carcinogen which has been estimated, using mathematical modeling, to result in a very low incidence of cancer, somewhere between zero and a specified incidence, e.g. one cancer in a million exposed people.
Substance used to control viruses.
volume of distribution
Apparent (hypothetical) volume of fluid required to contain the total amount of a substance in the body at the same concentration as that present in the plasma assuming equilibrium has been attained.
volatile organic chemicals (VOC)
Any organic compound having, at 293.15 K, a vapor pressure of 0.01 kPa or more, or having a corresponding volatility under the particular condition of use.