Combined with anionic polymer at pH greater than pKa of polymer; simultaneous addition; improved paper filler and short fiber retentionUS20040171719 Feb 27, 2004 Sep 2, 2004 Neivandt David J. Starch compositions and methods of making starch compositions...
The lower the pKa, the stronger the acid and the greater its ability to donate protons. The pH depends on the concentration of the solution. This is important because it means a weak acid could actually have a lower pH than a diluted strong acid. For example, concentrated vinegar (acetic ...
For these types of applications, fluorescein conjugates are less than optimal because they have little sensitivity in the pH range below pH 5.5. The response range can be extended using conjugates of our Oregon Green 488 dye, which has a much lower pKa than fluorescein (4.7 compared w...
Acids with a pKa less than 8.0 tend to remain outside the cell, whereas basic drugs with a pKa greater than 6.0 tend to accumulate within it. Because the concentration differential across the cell membrane based on a pH gradient of 0.4 can equal 2.5:1, the acid–base status of a ...
However, the pKa of a given acid-base group in a protein residue may vary by several pH units from its expected value as a consequence of the electrostatic influence of the nearby charged groups and the polarity of its environment. It is interesting to note that this simple approach to the...
If pKa of HCOOH is 3.74, what is the pH of a buffer prepared by adding 100mL of 0.100M NaOH to 100mL of 0.20M HCOOH? Which of the following is the best approximation of percent ionization of a weak acid when the pH is one unit greater than the pKa? a. >90% b. <10% c. 50...
The adaptor protein talin, also called the master of integrin adhesions [71], links integrins directly to actin [109]. One of its several actin bindings sites is pH-dependent, with a more than twofold greater affinity of F-actin binding at pH 6.5 compared to pH 7.5 [152]. This is conco...
pKa ▲ ▼ Unit Size ▲ ▼ Cat No. ▲ ▼ RatioWorks™ BCFL, AM 454, 503 528 ∼7 1 mg 21190 RatioWorks™ BCFL Acid 454, 503 528 ∼7 1 mg 21189 RatioWorks™ BCFL, SE 454, 503 528 ∼7 1 mg 21191 Cell Meter™ Fluorimetric Intracellular pH Assay Kit 430, 505 535 ∼...
An exchange ratio greater than 1 at low pH clearly indicates that the mechanism of Cu binding cannot be due to monodentate binding, but must at least be partly due to bidentate binding. In contrast, the low exchange ratios for Ca and Cd are indicative of predominantly monodentate binding. The...
Solutions with a pH less than seven are acidic. Solutions with a pH greater than seven are basic. If a solution has a pH exactly equal to seven, it is neutral. Molecular Meanings Though a solution with a pH of 7.001 is basic from a chemical standpoint, it's very common for people to...