In general, flux in biology relates to movement of a substance between compartments. There are several cases where the concept of flux is important.
The movement of molecules across a membrane: in this case, flux is defined by the rate of diffusion or transport of a substance across a permeable membrane. Except in the case of active transport, net flux is directly proportional to the concentration difference across the membrane, the surface area of the membrane, and the membrane permeability constant.
In ecology, flux is often considered at the ecosystem level – for instance, accurate determination of carbon fluxes using techniques like eddy covariance (at a regional and global level) is essential for modeling the causes and consequences of global warming.
Metabolic flux refers to the rate of flow of metabolites through a biochemical network, along a linear metabolic pathway, or through a single enzyme. A calculation may also be made of carbon flux or flux of other elemental components of biomolecules (e.g. nitrogen). The general unit of flux is chemical mass /time (e.g., micromole/minute; mg/kg/minute). Flux rates are dependent on a number of factors, including: enzyme concentration; the concentration of precursor, product, and intermediate metabolites; post-translational modification of enzymes; and the presence of metabolic activators or repressors. Metabolic flux in biologic systems can refer to biosynthesis rates of polymers or other macromolecules, such as proteins, lipids, polynucleotides, or complex carbohydrates, as well as the flow of intermediary metabolites through pathways. Metabolic control analysis and flux balance analysis provide frameworks for understanding metabolic fluxes and their constraints.
Measuring movementEdit
Flux is the net movement of particles across a specified area in a specified period of time.[1] The particles may be ions or molecules, or they may be larger, like insects, muskrats or cars. The units of time can be anything from milliseconds to millennia. Flux is not the same as velocity or speed nor is it the same as density or concentration. Movement itself is not enough.
ReferencesEdit
^"Measuring Movement Using Flux". mathbench.umd.edu. Retrieved 2017-09-15.
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flux, biology, this, article, needs, additional, citations, verification, please, help, improve, this, article, adding, citations, reliable, sources, unsourced, material, challenged, removed, find, sources, flux, biology, news, newspapers, books, scholar, jsto. This article needs additional citations for verification Please help improve this article by adding citations to reliable sources Unsourced material may be challenged and removed Find sources Flux biology news newspapers books scholar JSTOR July 2018 Learn how and when to remove this template message In general flux in biology relates to movement of a substance between compartments There are several cases where the concept of flux is important The movement of molecules across a membrane in this case flux is defined by the rate of diffusion or transport of a substance across a permeable membrane Except in the case of active transport net flux is directly proportional to the concentration difference across the membrane the surface area of the membrane and the membrane permeability constant In ecology flux is often considered at the ecosystem level for instance accurate determination of carbon fluxes using techniques like eddy covariance at a regional and global level is essential for modeling the causes and consequences of global warming Metabolic flux refers to the rate of flow of metabolites through a biochemical network along a linear metabolic pathway or through a single enzyme A calculation may also be made of carbon flux or flux of other elemental components of biomolecules e g nitrogen The general unit of flux is chemical mass time e g micromole minute mg kg minute Flux rates are dependent on a number of factors including enzyme concentration the concentration of precursor product and intermediate metabolites post translational modification of enzymes and the presence of metabolic activators or repressors Metabolic flux in biologic systems can refer to biosynthesis rates of polymers or other macromolecules such as proteins lipids polynucleotides or complex carbohydrates as well as the flow of intermediary metabolites through pathways Metabolic control analysis and flux balance analysis provide frameworks for understanding metabolic fluxes and their constraints Measuring movement EditFlux is the net movement of particles across a specified area in a specified period of time 1 The particles may be ions or molecules or they may be larger like insects muskrats or cars The units of time can be anything from milliseconds to millennia Flux is not the same as velocity or speed nor is it the same as density or concentration Movement itself is not enough References Edit Measuring Movement Using Flux mathbench umd edu Retrieved 2017 09 15 nbsp This biology article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Flux biology amp oldid 1108653037, wikipedia, wiki, book, books, library,
