Results 281 to 290 of about 2,324,089 (344)

Deuterium exchange in arsenobetaine and dimethylarsinoylacetic acid

Journal of Inorganic Biochemistry, 2005
Arsenobetaine occurs naturally in almost all marine animals and it is assumed to be the unreactive end-product of a detoxification pathway. To investigate the properties of arsenobetaine and its likely immediate biogenic precursor, dimethylarsinoylacetic acid, we studied the exchanges of the C-2 methylene protons of these compounds in D2O solution and ...
John S, Edmonds, Makoto, Nomachi, Masatoshi, Morita   +2 more
openaire   +2 more sources

Cation-exchange in thiourea-hydrochloric acid solutions

Talanta, 1983
Ion-exchange distribution coefficients are reported for several transition and post-transition elements in solutions of hydrochloric acid (0.1-3.0M) and thiourea on AG50W resins. Some typical elution curves illustrate use of the systems with special reference to the separation of small amounts of gold, palladium, platinum, rhodium and iridium from ...
C H, -Siegfried, W, Weinert, F W, Strelow, R G, Böhmer   +3 more
openaire   +2 more sources

Ion-Exchange Equilibria of Amino Acids on a Strong Acid Resin

Industrial & Engineering Chemistry Research, 1996
The exchange equilibria of several amino acids, with particular emphasis on those displaying two basic groups, on a strong-acid cation exchange resin (Amberlite IR120) are investigated. The behavior of the experimental data is described through a mathematical model which takes into account the dissociation equilibria of amino acids in aqueous solution,
S. Melis, J. Markos, G. Cao, MORBIDELLI, MASSIMO   +3 more
openaire   +3 more sources

Acid exchange resins deactivation in the esterification of free fatty acids

Chemical Engineering Journal, 2010
In this work the deactivation of an ionic exchange resin, used as catalyst for promoting the esterification of fatty acids for producing biodiesel, has been studied. At this purpose, a dynamic mathematical model, suitable to describe the performances of a continuous tubular reactor containing the catalysts mixed with stainless steel springs as inert ...
TESSER, RICCARDO, SANTACESARIA, ELIO, DI SERIO, MARTINO, L. Casale, M. Ledda, L. Sannino   +5 more
openaire   +3 more sources

[Dynamic Effects of Direct Returning of Straw and Corresponding Biochar on Acidity, Nutrients, and Exchangeable Properties of Red Soil].

Huan jing ke xue= Huanjing kexue, 2020
Cai-di Yang, Sheng-Gao Lu
semanticscholar   +1 more source

THE ISOTOPIC EXCHANGE OF FLUOROBORIC ACID WITH HYDROFLUORIC ACID

The Journal of Physical Chemistry, 1960
The isotopic exchange rate of fluorine between fluoroboric and hydrofluoric acids was investigated. The rate of exchange R = 4.5 x 10/sup -4/ e/ sup -24//sup .70//sup 0// /sup RT/ STABF/sup -//sub 4/!STAH/sup +/! liters mole/ sup -1/ sec/sup -1/. The exchange was found to proceed via HBF/sub 4/ = HF + BF/ sub 3/.
M. Anbar, S. Guttmann
openaire   +1 more source

Potential Sources of Exchangeable Acidity in Strongly Acid Soils (pHKCl < 3.3) and Validation of Its Determination

Eurasian Soil Science, 2018
E. V. Shamrikova, E. V. Vanchikova, T. Sokolova, E. V. Zhangurov, S. Deneva, Yu. I. Bobrova, E. V. Kyzyurova   +6 more
semanticscholar   +1 more source

Comparative assessment of the methods for exchangeable acidity measuring

Eurasian Soil Science, 2016
E. V. Vanchikova, E. V. Shamrikova, N. V. Bespyatykh, G. A. Zaboeva, Yu. I. Bobrova, E. V. Kyz”yurova, N. Grishchenko   +6 more
semanticscholar   +1 more source

ACID‐BASE BALANCE IN EXCHANGE TRANSFUSION

BJOG: An International Journal of Obstetrics & Gynaecology, 1965
D J, MACRAE, D, PALAVRADJI
openaire   +2 more sources

Metrological assessment of the methods for measuring the contents of acids and ion metals responsible for the exchangeable acidity of soils

Eurasian Soil Science, 2015
E. V. Vanchikova, E. V. Shamrikova, N. V. Bespyatykh, E. V. Kyz”yurova, B. Kondratenok   +4 more
semanticscholar   +1 more source