6 or β-1,3 linkages of glucans12. Moreover, such a construction of the yeast cell wall results in there being many functional groups on its surface such as phosphate, carboxyl and amino groups. Under appropriate conditions of pH (above pKavalue), these...
In Eq. (28), \({pKa}_{Al\left(III\right)}\) is the activity constant that describes pH-dependent changes in the number of sorption sites exhibiting affinity for anionic forms of PAAHs. The above sites are associated with extractable Al3+ species adsorbed by FA, as well as with the ...
The proton acceptor group in the recently described retinal protein, proteorhodopsin has an unusually high pKa of 7.1. It was shown that at pH above this pKa, illumination initiates a photocycle similar to that of bacteriorhodopsin, and the protein transports proton across the cell membrane. ...
the numerator in regard to the denominator in this equation, the higher the ka; the more highly dissociated the acid at equilibrium, the higher the numerator in relation to the denominator in this equation, and thus the higher the ka. given the pka of the acid and the concentrations above ...
The hydroxyl groups may have acid (pKa = 2.9) or basic character (pKa = 12.7), if they are bidentate or monodentate, respectively (Herrmann and Boehm, 1969). For these reasons the TiO2 surface can be protonated or deprotonated depending on the pH value of the aqueous suspension (Fig. 1.12...
In chronic cutaneous wounds, pHeincreases considerably from the wound edge (below 6.5) to the wound center (above 7.4) over distances of less than 1 cm [136]. At inflammatory sites, e.g., during the course of inflammatory responses against bacteria in peripheral tissues, pHecan be as low ...
$${\delta }_{{{\mathrm{obs}}}=({\delta }_{A}+1{0}^{{pKa}-{{{\mathrm{pH}}}* {\delta }_{{HA}})/(1+{10}^{{pKa}-{{{\mathrm{pH}}}),$$ whereδobsis the measured chemical shift,δAis the chemical shift of the deprotonated form andδHAis the chemical shift of the pro...
Almost all known pH-responsive antibodies sense pH due to histidine residues within their variable regions. pKa value of the histidine side chain is about 6; thus, at pH below 6.0, the histidine side chain is mostly protonated, whereas, at physiologic pH 7.4, it is deprotonated. It was show...
Similarly, the presence of these remaining deprotonated glutamic acids form salt bridges which may aid in stabilizing the inter-helical tertiary structure of the monomers through charge-charge interactions between N- and C-terminal helices [54]. The disparity between the pKa values of E85A and E...
Based on the above discussion, the dual response mechanism for P(NIPAAM-co-AAc)-PC was proposed. The pH response mechanism is illustrated in Fig. 5a. In the final synthesized P(NIPAAM-co-AAc), there were two reactive polymers AAc (pKa ∼ 4.25) and chitosan (pKb ∼ 6.5) [40]. ...