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The Van Slyke determination is a chemical test for the determination of amino acids containing a primary amine group. It is named after the biochemist Donald Dexter Van Slyke (1883-1971). [1] One of Van Slyke's first professional achievements was the quantification of amino acids by the Van Slyke determination reaction. [2]
By contrast, at almost the same time, Donald Van Slyke and G. E. Cullen [79] treated the binding step as an irreversible reaction. The Briggs–Haldane equation was of the same algebraic form as both of the earlier equations, but their derivation is based on the quasi- steady state approximation, which is the concentration of intermediate ...
Donald Dexter Van Slyke (March 29, 1883 – May 4, 1971), nicknamed Van, was a Dutch American biochemist. His achievements included the publication of 317 journal articles and 5 books, [ 1 ] as well as numerous awards, among them the National Medal of Science and the first AMA Scientific Achievement Award . [ 1 ]
Buffer capacity rises to a local maximum at pH = pK a. The height of this peak depends on the value of pK a. Buffer capacity is negligible when the concentration [HA] of buffering agent is very small and increases with increasing concentration of the buffering agent. [3] Some authors show only this region in graphs of buffer capacity. [2]
A pipette (sometimes spelled as pipet) is a type of laboratory tool commonly used in chemistry and biology to transport a measured volume of liquid, often as a media dispenser. Pipettes come in several designs for various purposes with differing levels of accuracy and precision , from single piece glass pipettes to more complex adjustable or ...
With nitrous acid, one obtains glycolic acid (van Slyke determination). With methyl iodide, the amine becomes quaternized to give trimethylglycine, a natural product: H 3 N + CH 2 COO − + 3 CH 3 I → (CH 3) 3 N + CH 2 COO − + 3 HI. Glycine condenses with itself to give peptides, beginning with the formation of glycylglycine: [34] 2 H 3 N ...
Electrophoresis is the basis for analytical techniques used in biochemistry and molecular biology to separate particles, molecules, or ions by size, charge, or binding affinity, either freely or through a supportive medium using a one-directional flow of electrical charge. [10] It is used extensively in DNA, RNA and protein analysis. [11]
Donnan equilibrium across a cell membrane (schematic). The Gibbs–Donnan effect (also known as the Donnan's effect, Donnan law, Donnan equilibrium, or Gibbs–Donnan equilibrium) is a name for the behaviour of charged particles near a semi-permeable membrane that sometimes fail to distribute evenly across the two sides of the membrane. [1]