| models, theoretical | Theoretical representations that simulate the behaviour or activity of systems, processes, or phenomena. They include the use of mathematical equations, computers, and other electronic equipment. (12 Dec 1998) |
|---|---|
| prevalence models | <epidemiology> Prevalence models are compartmental models dividing the host population into, for example, susceptible, latent, infectious and immune individuals. (05 Dec 1998) |
| proportional hazards models | Statistical models used in survival analysis that assert that the effect of the study factors on the hazard rate in the study population is multiplicative and does not change over time. (12 Dec 1998) |
| disease models, animal | Animal disease whose pathologic mechanisms are sufficiently similar to those of a different human disease for the animal disease to serve as a model. The animal disease may be either induced or naturally occurring so long as it is not the same clinical entity as the disease for which it serves as a model. E.g., scrapie is an animal model for multiple sclerosis, which has never been found or induced in an animal. (12 Dec 1998) |
| transgenic disease models | Animals that have been created to acquire particular human diseases. (14 Nov 1997) |
| linear models | Statistical models in which the value of a parameter for a given value of a factor is assumed to be equal to a + bx, where a and b are constants. The models predict a linear regression. (12 Dec 1998) |
| lock and key models | <chemistry, immunology> Specific recognition in biological systems might be mediated through interactions that depend upon very precise steric matching between receptor and ligand or between enzyme and substrate. The commonly used analogy is between lock and key and implies a precise sterically determined interaction. (18 Nov 1997) |
| logistic models | Statistical models which describe the relationship between a qualitative dependent variable (that is, one which can take only certain discrete values, such as the presence or absence of a disease) and an independent variable. A common application is in epidemiology for estimating an individual's risk (probability of a disease) as a function of a given risk factor. (12 Dec 1998) |
| relative molecular mass | The sum of the atomic weight's of all the atoms constituting a molecule; the mass of a molecule relative to the mass of a standard atom, now 12C (taken as 12.000). Relative molecular mass (Mr) is the mass relative to the dalton and has no units. See: atomic weight. Synonym: molecular mass, molecular weight ratio, relative molecular mass. (05 Mar 2000) |
| gram-molecular weight | Molecular weight expressed in grams. Compare: mole. (05 Mar 2000) |
| cloning, molecular | The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells. (12 Dec 1998) |
| molecular | <chemistry> Of, pertaining to or composed of molecules: a very small mass of matter. (18 Nov 1997) |
| molecular behaviour | <psychology> Behaviour described in small response units rather than larger ones; a specific response. Compare: molar behaviour. (05 Mar 2000) |
| molecular biology | <study> The study of the biochemistry of cells, it is closely linked to cell biology, in particular the biochemistry of DNA and cogeners. (16 Dec 1997) |
| molecular biophysics | Biophysics concerned with membrane processes, conformational and configurational properties of macromolecules, bioelectrical phenomena, etc. (05 Mar 2000) |