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The Samsung Galaxy Note 9 (stylized as Samsung Galaxy Note9) is an Android -based phablet designed, developed, produced and marketed by Samsung Electronics as part of the Samsung Galaxy Note series. It was unveiled on 9 August 2018, as the successor to the Samsung Galaxy Note 8. [ 2][ 3][ 4] It is available in six colours (Ocean Blue, Midnight ...
Buffer capacity falls to 33% of the maximum value at pH = pK a ± 1, to 10% at pH = pK a ± 1.5 and to 1% at pH = pK a ± 2. For this reason the most useful range is approximately p K a ± 1. When choosing a buffer for use at a specific pH, it should have a p K a value as close as possible to that pH.
Good's buffers. Good's buffers (also Good buffers) are twenty buffering agents for biochemical and biological research selected and described by Norman Good and colleagues during 1966–1980. [ 1][ 2][ 3] Most of the buffers were new zwitterionic compounds prepared and tested by Good and coworkers for the first time, though some ( MES, ADA, BES ...
Britton–Robinson buffer. The Britton–Robinson buffer ( BRB or PEM) is a "universal" pH buffer used for the pH range from 2 to 12. It has been used historically as an alternative to the McIlvaine buffer, which has a smaller pH range of effectiveness (from 2 to 8). [ 1]
McIlvaine buffer is a buffer solution composed of citric acid and disodium hydrogen phosphate, also known as citrate-phosphate buffer. It was introduced in 1921 by the United States agronomist Theodore Clinton McIlvaine (1875–1959) from West Virginia University , and it can be prepared in pH 2.2 to 8 by mixing two stock solutions.
Isoelectric focusing. Scheme of isoelectric focusing with immobilized pH gradient (IPG) gels. Isoelectric focusing ( IEF ), also known as electrofocusing, is a technique for separating different molecules by differences in their isoelectric point (pI). [ 1][ 2] It is a type of zone electrophoresis usually performed on proteins in a gel that ...
HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) is a zwitterionic sulfonic acid buffering agent; one of the twenty Good's buffers.HEPES is widely used in cell culture, largely because it is better at maintaining physiological pH despite changes in carbon dioxide concentration (produced by aerobic respiration) when compared to bicarbonate buffers, which are also commonly used in cell ...
For general purposes, buffers at pH 4.00 and pH 10.00 are suitable. The pH meter has one calibration control to set the meter reading equal to the value of the first standard buffer and a second control to adjust the meter reading to the value of the second buffer. A third control allows the temperature to be set.
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