mass (mas)
inner cell mass
1. a lump or collection of cohering particles.
2. a cohesive mixture to be made into pills.
3. the characteristic of matter that gives it inertia. Symbol m.
atomic mass atomic weight; used particularly when describing a single isotope of a nuclide.
inner cell mass embryoblast.
lean body mass that part of the body including all its components except neutral storage lipid; in essence, the fat-free mass of the body.
molar mass (M ) the mass of a molecule in grams (or kilograms) per mole.
molecular mass the mass of a molecule in daltons, derived by addition of the component atomic masses. Its dimensionless equivalent is molecular weight.
relative molecular mass technically preferable term for molecular weight. Symbol M r.
in·ner cell mass ( n  r)n. The mass at the embryonic pole of the blastocyst concerned with the formation of the body of the embryo. |
inner cell mass
Etymology: AS, innera, within; L, cella, storeroom, massa, lump
a cluster of cells localized at the animal pole of the blastocyst of placental mammals from which the embryo develops. See also trophoblast. Also called cell mass.
mass
1. a lump or collection of cohering particles.
2. that characteristic of matter which gives it inertia.
mass-action ratios
the ratio of substrate to product, where the predominance of one, usually the substrate, over the other thermodynamically favors a particular direction for a reaction.
inner cell mass
an internal cluster of cells at the embryonic pole of the blastocyst which develops into the body of the embryo.
lean body mass
that part of the body including all its components except neutral storage lipid; in essence, the fat-free mass of the body.
mass medication
(or immunization, or treatment, or prophylaxis, or testing, or screening) application of the procedure to all of the animals in the population, which may be as small as a herd or as large as a national herd. This sort of strategy has been used extensively and for many years in the control of diseases of animals, and has been the principal reason for the dramatic virtual eradication of the major plagues in many countries. The unintelligent extension of the strategy to the control of wastage caused by endemic disease has contributed most to the problem of residues of antibacterial drugs in the human food chain. See also mass medication.
mass number
the number used to express the mass of a nucleus, being the total number of nucleons, protons and neutrons in the nucleus of an atom or nuclide; symbol A.
mass reflex
reflex actions by all the body parts controlled by the part of the spinal cord which has been injured.
thalamic intermediate mass
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