The titration alkalinity and total carbon dioxide concentration data obtained during the GEOSECS Expeditions, 1972-1977, in the Atlantic, Pacific and Indian Oceans have been summarized. The oceans have been divided into seven oceanic regions, and the mean vertical distributions of the alkalinity and total CO2 concentration have been computed. In addition, the vertical distributions of these qua...

Alum had been used in traditional medicine for treatment of oral lesions in Iran.the main aim of this study was to find out a suitable formulation for the mucoadhesive fprm of alum.in this study some materials such as alum,carboxymethyl cellulose  (CMC) and Arabic Gum were used.different bases of gum and CMC were made and titration of alum was performed with suitable vbuffer and the rate of wa...

C . T. KAPPAGODA, R. J. LINDEN, H. M. SNOW AND J. B. STOKER, Cardiovascular Unit, Department of Physiology, The University, Lee&, 6 August 1973 In an attempt to decide on a clinically acceptable method of assessing the metabolic component of the acid-base status of blood, Lewis & Stoddart [Clinical Science (1973) 44, 297-3001 compared two indices of the non-respiratory state of blood in vivo. T...

Research has been carried out to examine the extraction and application of purple sweet potato tuber extract as an indicator acid-base titration. Purple was obtained by extracting fresh tubers using ethanol 95% medical grade (PSPTE-95%) 96% analytical (PSPTE-96%). Three variations maceration stage extracted samples. The used for a phytochemical test applied Based on research conducted, rendemen...

Undergraduate biochemistry students should have great familiarity with titration curves. These curves allow the prediction of protonation states, charges, and isoelectric points. Here we describe an experiment in which students identify four amino acids based on their titration behavior. Students make solutions of each unknown amino acid and monitor the change in pH upon adding aliquots of a st...

Quantitative determination of Brønsted acid sites in acidic mordenite samples with varying proton concentrations has been studied using aqueous conductometric titration method. Conductometric titration of the ammonium form of mordenite with sodium hydroxide is feasible and the results indicate potential number of Brønsted acid sites. However, Brønsted acid sites concentration in acidic mordenit...

Theis and Steinhardt (1) recently have shown that, when native collagen is treated with calcium or magnesium chloride solutions, drastic shrinkage of the collagen occurs at low temperatures. It was further shown that potassium or sodium chloride has exactly the reverse effect; i.e., they actually increase the temperature at which collagen is said to contract. The effect of neutral salts upon th...

I HE MICIIODETERMIXATION of fiee fatt acids (FFA) in plasma has received colisiderable attelition in recent years (1-8). Although a riumher of different procedures Ilave beemi reported, most of them consist of 2 essential steps: tire extraction of tire FFA from plasnla with orgamlic solvents, an(1 the titration of the extracted FFA in a 2-phase system with a standard aqueous base. Various extra...

The coulometric titration of 20-200 peq of acids and bases in DMSO media is described. In the titration of bases, the electro-oxidation of hydrogen at a platinized platinum electrode is used as the source of protons. The conditions for 100 % current efficiency at this electrode are low current density to avoid passivity and regular treatment of the electrode with potassium dichromate-sulfuric a...

The raffinose (raf) operon is negatively controlled by the specific binding of raf repressor (rafR gene) to raf operator (rafO) DNA. Both rafR and rafO have been sequenced. The 1,011-base-pair rafR gene encodes a 336-amino-acid polypeptide containing an N-terminal helix-turn-helix motif. rafO, as defined by in vivo titration of raf repressor, consists of two nearly identical 18-base-pair palind...