positron emission tomography
PET | using a computerized radiographic technique to examine the metabolic activity in various tissues (especially in the brain) |
emission
emanation | the act of emitting, causing to flow forth |
| field-emission microscope | electron microscope used to observe the surface structure of a solid |
positron emission tomography scanner
PET scanner | a tomograph that produces cross-sectional Xays of metabolic processes in the body |
absorptivity
absorption factor | (physics) the property of a body that determines the fraction of the incident radiation or sound flux absorbed or absorbable by the body |
sun protection factor
SPF | the degree to which a sunscreen protects the skin from the direct rays of the sun |
releasing hormone
RH
releasing factor
hypothalamic releasing hormone
hypothalamic releasing factor | any of several hormones produced in the hypothalamus and carried by a vein to the anterior pituitary gland where they stimulate the release of anterior pituitary hormones, each of these hormones causes the anterior pituitary to secrete a specific hormone |
gene
cistron
factor | (genetics) a segment of DNA that is involved in producing a polypeptide chain, it can include regions preceding and following the coding DNA as well as introns between the exons, it is considered a unit of heredity, genes were formerly called factors |
| cognitive factor | something immaterial (as a circumstance or influence) that contributes to producing a result |
determinant
determiner
determinative
determining factor
causal factor | a determining or causal element or factor, education is an important determinant of one's outlook on life |
clincher
decisive factor | a point or fact or remark that settles something conclusively |
| factor | an independent variable in statistics |
component
constituent
element
factor
ingredient | an abstract part of something, jealousy was a component of his character, two constituents of a musical composition are melody and harmony, the grammatical elements of a sentence, a key factor in her success, humor: an effective ingredient of a speech |
| factor analysis | any of several methods for reducing correlational data to a smaller number of dimensions or factors, beginning with a correlation matrix a small number of components or factors are extracted that are regarded as the basic variables that account for the interrelations observed in the data |
Sixteen Personality Factor Questionnaire
PF | a selfeport personality inventory developed by Raymond B. Cattell to measure the personality dimensions that emerged from his factor analysis of a wide range of traits |
clincher
determiner determining factor | an argument that is conclusive |
| factor | anything that contributes causally to a result, a number of factors determined the outcome |
| emission | the occurrence of a flow of water (as from a pipe) |
agent factor
broker | a businessman who buys or sells for another in exchange for a commission |
| emission spectrum | spectrum of electromagnetic radiation emitted by a self-luminous source |
infrared
infrared light
infrared radiation
infrared emission | electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves |
radio wave
radio emission
radio radiation | an electromagnetic wave with a wavelength between . cm to , m |
discharge
emission expelling | any of several bodily processes by which substances go out of the body, the discharge of pus |
| emission | the release of electrons from parent atoms |
| field emission | the emission of electrons that are stripped from parent atoms by a high electric field |
| nocturnal emission | ejaculation during sleep (usually during a dream) |
| photoelectric emission | the release or absorption of quanta above a certain energy level |
| secondary emission | the emission of electrons from a surface that is bombarded by higher energy primary electrons |
thermionic emission
thermal emission | the emission of electrons from very hot substances |
coefficient of reflection
reflection factor
reflectance
reflectivity | the fraction of radiant energy that is reflected from a surface |
| factor | any of the numbers (or symbols) that form a product when multiplied together |
| conversion factor | factor by which a quantity that is expressed in one set of units must be multiplied in order to convert it into another set of units |
factor of proportionality
constant of proportionality | the constant value of the ratio of two proportional quantities x and y, usually written y kx, where k is the factor of proportionality |
| prime factor | the prime factors of a quantity are all of the prime quantities that will exactly divide the given quantity |
| divisor factor | one of two or more integers that can be exactly divided into another integer, what are the factors of ? |
multiplier
multiplier factor | the number by which a multiplicand is multiplied |
| scale factor | a number used as a multiplier in scaling |
| time-scale factor | the ratio of the simulation time to the time of the real process |
| equivalent-binary-digit factor | the average number of binary digits needed to express one radix digit in a numeration system that is not binary, on the average a number that can be expressed in N decimal digits takes .N binary digits |
common divisor
common factor
common measure | an integer that divides two (or more) other integers evenly |
greatest common divisor
greatest common factor
highest common factor | the largest integer that divides without remainder into a set of integers |
correction
fudge factor | a quantity that is added or subtracted in order to increase the accuracy of a scientific measure |
| load factor | (aeronautics) the ratio of an external load to the weight of the aircraft (measured in g) |
safety factor
factor of safety | the ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use |
| rheumatoid factor | autoantibody that is usually present in the serum of people with rheumatoid arthritis |
| growth factor | a protein that is involved in cell differentiation and growth |
nerve growth factor
NGF | a protein that is involved in the growth of peripheral nerve cells |
tumor necrosis factor
tumour necrosis factor
TNF | a proinflammatory cytokine that is produced by white blood cells (monocytes and macrophages), has an antineoplastic effect but causes inflammation (as in rheumatoid arthritis) |
discharge
emission | a substance that is emitted or released |
greenhouse gas
greenhouse emission | a gas that contributes to the greenhouse effect by absorbing infrared radiation |