Analytic expressions for plasma total titratable base, base excess (DeltaCB), strong-ion difference, change in strong-ion difference (DeltaSID), change in Van Slyke standard bicarbonate (DeltaVSSB), anion gap, and change in anion gap are derived as a function of pH, total buffer ion concentration, and conditional molar equilibrium constants. The behavior of these various parameters under respir...

This essay looks at the historical significance of two APS classic papers that are freely available online: Pitts RF and Alexander RS. The nature of the renal tubular mechanism for acidifying the urine. Am J Physiol 144: 239-254, 1945 (http://ajplegacy.physiology.org/cgi/reprint/144/2/239). Pitts RF and Lotspeich WD. Bicarbonate and the renal regulation of acid base balance. Am J Physiol 147: 1...

The structure of d(CGCGm4CG) were m4C = N4-methylcytosine has been determined by crystallographic methods. The crystals are multifaced prisms, with orthorhombic space group P2(1)2(1)2(1) and unit cell dimensions of a = 17.98, b = 30.77 and c = 44.75A. The asymmetric unit consists of one duplex of hexanucleotide and 49 waters. The R-factor is 0.189 for 1495 reflections with F > or = sigma(F) to ...

A series of fluorescent carbazolylurea base anion receptors have been synthesised that show a high affinity for oxo-anions (particularly bicarbonate and acetate). The fluorescence of dicarbazolylurea (1) is quenched upon addition of benzoate anions in DMSO-0.5% water.

The title compound, [Zn(C(15)H(14)NO(2))(2)], contains a four-coordinate Zn atom located on a twofold rotation axis that exhibits a distorted tetra-hedral geometry by two phenolate O atoms and two azomethine N atoms of the Schiff base 2-methoxy-6-[(4-methyl-phen-yl)imino-meth-yl]phenolate ligands.