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The isoelectric point (pI, pH(I), IEP), is the pH at which a molecule carries no net electrical charge or is electrically neutral in the statistical mean. The standard nomenclature to represent the isoelectric point is pH(I). [1] However, pI is also used. [2] For brevity, this article uses pI.
Isoelectric point, the pH at which a particular molecule carries no net electrical charge; Isoelectric focusing, a technique for separating different molecules by differences in their isoelectric point; Isoelectric line representing the absence of electrical activity on an electrocardiogram
Molecular orbital diagrams best illustrate isoelectronicity in diatomic molecules, showing how atomic orbital mixing in isoelectronic species results in identical orbital combination, and thus also bonding. More complex molecules can be polyatomic also. For example, the amino acids serine, cysteine, and selenocysteine are all isoelectronic to ...
By modification of the isoelectric point (pI) of molecules of an enzyme by, e.g., phosphorylation or dephosphorylation, the cell can transfer molecules of the enzyme between different parts of its interior, to switch on or switch off particular biochemical processes.
The isoionic point is the pH value at which a zwitterion molecule has an equal number of positive and negative charges and no adherent ionic species. It was first defined by S.P.L. Sørensen , Kaj Ulrik Linderstrøm-Lang and Ellen Lund in 1926 [ 1 ] and is mainly a term used in protein sciences.
“It’s like everything has culminated to the right point, but there’s the starting line, and here’s us,” Hannah said. “We just can’t get to it.” ...
There’s an entire Facebook page dedicated to pleading for its return, and avid dip lovers say they’ve never been able to find a suitable replacement. Sister Schubert's Sausage Rolls
The iso-electric point is the pH value at which the zeta potential is approximately zero. At a pH near the iso-electric point (± 2 pH units), colloids are usually unstable; the particles tend to coagulate or flocculate. Such titrations use acids or bases as titration reagents. Tables of iso-electric points for different materials are available ...