Direct excitation and {1H}13C-CPMAS NMR allowed detecting carbamate–ammonium ion pairs, carbamic acid bicarbonate species in amine-modified silica sorbents.

We report here experimental evidence for the hydrothermal formation of a pure organic molecule, phenol, from the reaction of carbonate with water in the presence of iron powders.

Potassium taurine bicarbonate (PTB), an equimolar blend of potassium bicarbonate and taurine, provides a convenient and feasible means of delivering physiologically significant doses of potassium, taurine, and organic base when dissolved in water (“Kwater”). This brief essay reviews the versatile and complementary health benefits that likely would accrue in individuals making regular use of K-w...

using ion-exchange resins, a multiple-unit type of oral floating dosage system has been prepared to prolong gastric emptying time of dosage form. the system is composed of beads of drug-resin complex, which are loaded with bicarbonate ions and coated with a hydrophobic polymer. the system is so designed that when the beads reach the stomach, chloride ions are exchanged with bicarbonate and drug...

SCHILB, THEODORE P., AND WILLIAM A. BRODSKY. CO, gradients and acidicfication by transport of HCO, in turtle bladders. Am. J. ‘Physiol. 222(Z) : 272-281. 1972.-During acidification of the mucosal fluid in turtle bladder sacs, the final mucosal [COJ and transmural gradient of [CO,] are dependent on: the serosal [CO,], the transport rate and clearance of bicarbonate, the buffer “poise” of the muc...

OBJECTIVE To review and compare the 'metabolic' component of an acid-base abnormality by assessing the arterial blood bicarbonate and the 'strong ion difference'. DATA SOURCES A review of published peer-review articles and studies reported from 1983 to 1999 and identified through a MEDLINE search on 'strong ion difference'. SUMMARY OF REVIEW The Henderson-Hasselbalch equation describes the ...

The active sites of aminopeptidase A (PepA) from Escherichia coli and leucine aminopeptidase from bovine lens are isostructural, as shown by x-ray structures at 2.5 A and 1.6 A resolution, respectively. In both structures, a bicarbonate anion is bound to an arginine side chain (Arg-356 in PepA and Arg-336 in leucine aminopeptidase) very near two catalytic zinc ions. It is shown that PepA is act...

Biotin carboxylase (BC) activity is shared among biotin-dependent carboxylases and catalyzes the Mg-ATP-dependent carboxylation of biotin using bicarbonate as the CO(2) donor. BC has been studied extensively over the years by structural, kinetic, and mutagenesis analyses. Here we report three new crystal structures of Escherichia coli BC at up to 1.9 Å resolution, complexed with different ligan...

SCHILB, THEODORE P., AND WILLIAM A. BRODSKY. CO, gradients and acidicfication by transport of HCO, in turtle bladders. Am. J. ‘Physiol. 222(Z) : 272-281. 1972.-During acidification of the mucosal fluid in turtle bladder sacs, the final mucosal [COJ and transmural gradient of [CO,] are dependent on: the serosal [CO,], the transport rate and clearance of bicarbonate, the buffer “poise” of the muc...