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Bioconcentration. In aquatic toxicology, bioconcentration is the accumulation of a water-borne chemical substance in an organism exposed to the water. [1][2] There are several ways in which to measure and assess bioaccumulation and bioconcentration. These include: octanol-water partition coefficients (K OW), bioconcentration factors (BCF ...
Bromochlorodifluoromethane (BCF), also referred to by the code numbers Halon 1211 and Freon 12B1, is a haloalkane with the chemical formula C F 2 Cl Br. It is used for fire suppression, especially for expensive equipment or items that could be damaged by the residue from other types of extinguishers. [ 1 ] It is stored as a liquid under pressure and vaporizes when discharged to suppress fires ...
Half-life is constant over the lifetime of an exponentially decaying quantity, and it is a characteristic unit for the exponential decay equation. The accompanying table shows the reduction of a quantity as a function of the number of half-lives elapsed.
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The structure of tris (pentafluorophenyl)borane (BCF) was determined by gas electron diffraction. [3] It has a propeller-like arrangement of its three pentafluorophenyl groups with a torsional angle of 40.6 (3)° for the deviation of these groups from a hypothetically planar arrangement. Compared with a torsional angle of 56.8 (4)° for tris (perfluoro-para-tolyl)borane, which is a stronger ...
There are three naturally occurring isotopes of carbon: 12, 13, and 14. 12. C. and 13. C. are stable, occurring in a natural proportion of approximately 93:1. 14. C. is produced by thermal neutrons from cosmic radiation in the upper atmosphere, and is transported down to earth to be absorbed by living biological material.
The mean lifetime can be looked at as a "scaling time", because the exponential decay equation can be written in terms of the mean lifetime, , instead of the decay constant, λ: and that is the time at which the population of the assembly is reduced to 1⁄e ≈ 0.367879441 times its initial value. This is equivalent to ≈ 1.442695 half-lives.
In particle physics and nuclear physics, the branching fraction (or branching ratio) for a decay is the fraction of particles which decay by an individual decay mode or with respect to the total number of particles which decay.
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