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Bioconcentration factor can also be expressed as the ratio of the concentration of a chemical in an organism to the concentration of the chemical in the surrounding environment. The BCF is a measure of the extent of chemical sharing between an organism and the surrounding environment. [5]
Bioaccumulation is the gradual accumulation of substances, such as pesticides or other chemicals, in an organism. [1] Bioaccumulation occurs when an organism absorbs a substance faster than it can be lost or eliminated by catabolism and excretion .
Bioaccumulation occurs within a trophic level, and is the increase in the concentration of a substance in certain tissues of organisms' bodies due to absorption from food and the environment. Bioconcentration is defined as occurring when uptake from the water is greater than excretion.
The CBR is the whole-body concentration of a chemical that is associated with a given adverse biological response [1] and it is estimated using a partition coefficient and a bioconcentration factor. The whole-body residues are reasonable first approximations of the amount of chemical present at the toxic action site(s). [3]
The bioaccumulative ability of PBTs follows suit with the persistence attribute by the high resistance to degradation by biotic factors, especially with in organisms. Bioaccumulation is the result of a toxic substance being taken up at a higher rate than being removed from an organism.
The largest male white shark ever tagged by the research group OCEARCH was spotted in Florida waters. The shark, named Contender, was first tagged and released by OCEARCH on Jan. 17.
Pluto likely acquired large moon Charon in a “kiss and capture” collision billions of years ago. It may have created a subsurface ocean on the icy dwarf planet.
The arrival of a baby swell shark at an aquarium in Louisiana has caused a wave of excitement, after the egg hatched despite the fact that no male sharks appear to have been involved.