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Molecular Model: A representation of a molecule. The model can be purely computational or it can be an actual physical object. Stick models show bonds, ball-and-stick models show bonds and atoms, and spacefi . . . View Full Definition

Network Model HMO: An HMO that contracts with more than one group practice of physicians or specialty groups.

Molecular Weight: The average mass of a molecule, calculated by summing the atomic weights of atoms in the molecular formula. Note that the words mass and weight are often used interchangeably in chemistry.

OSI Reference Model: (Open Systems Interconnect) A network communications software standard that consists of a seven layer structure of specified protocol and services.

Physiologically Based Pharmacokinetic Model (PBPK Model): A computer model that describes what happens to a chemical in the body. This model describes how the chemical gets into the body, where it goes in the body, how it is changed by the body, an . . . View Full Definition

Quantum Models Of Speciation: Models of evolution that hold that speciation sometimes occurs rapidly as well as over long periods, as the classical theory proposed.

Pie Model Of Capital Structure: A model of the debt-equity ratio of the firms, graphically depicted in slices of a pie that represent the value of the firm in the capital markets.

Molecular Sieve: A material that contains many small cavities interconnected with pores of precisely uniform size. Zeolites are an example. Molecular sieves adsorb molecules that are small enough to pass thr . . . View Full Definition

Molecular Orbital: A wavefunction that describes the behavior of an electron in a molecule. Molecular orbitals are usually spread across many atoms in the molecule, and they are often described as a combinatio . . . View Full Definition

Molecular Formula: A notation that indicates the type and number of atoms in a molecule. The molecular formula of glucose is C6H12O6, which indicates that a molecule of glucose contains 6 atoms of carbon, 12 a . . . View Full Definition