نتایج جستجو برای: ion concentration

تعداد نتایج: 565746  

Mir Kamran Mousavi Hosseini, Mohammad Ali Jalili, Mojgan Pourmokhtar, Saleh Nasiri,

Background: In this study we have prepared the IgA solution from normal human plasma using plasma fractionation and ion exchange chromatography. Materials and Methods: Using fractionation of plasma with cold ethanol (starting with 8% ethanol), fraction III was prepared as a suitable source for IgA preparation. Then it was treated with caprylic acid for separation of impurities. For enrichm...

2003
JOHN H. NORTHROP

One of the most striking peculiarities of enzyme action is the fact that the activity of the enzyme is limited to a definite range of acidity. If the solution is more or less acid than this the enzyme is practically inactive. SSrensen 1 showed that for a number of enzymes the determiuing factor was the hydrogen ion concentration and not the total acidity of the solution. In attempting to accoun...

2011
Brian J. Chow Weiyi Lu Aijie Han Hyuck Lim Yu Qiao

By measuring the ion concentration in a pressure-induced infiltration experiment on a hydrophobic Zeolite Socony Mobil-5, it is found that the nanopore wall has a strong ion repelling effect. When the initial ion concentration is relatively low, only water molecules can enter the nanopores. Once the initial ion concentration is relatively high, ions can infiltrate into the nanopores, but the ef...

The aim of this study was to investigate the effect of tartrate ion (C4H4O62-) on the extraction and separation of zinc and cadmium using D2EHPA extractant. The presence of tartrate ion in the solution caused the shift of  the  extraction curve of zinc and cadmium to the more alkaline pH; however, the shifting rate for the cadmium extraction curve was more significant. In the absence of tartrat...

A. Krishna Mitra K. Talukdar, M. Bhushan,

Ion channels are naturally occurring pores through the proteins that regulate the passage of ions and thus maintain the concentration of ions inside and outside the cell. The ion channels control many physiological functions and they can show selectivity for a specific ion. Ion channels are mostly observed in nerve cells and muscle cells. The influx of ions into cells can be regulated by a gate...

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2013
siamak modarresi mohammad reza dehghani parinaz alimardani sara kazemi sabzvar farzaneh feyzi

potentiometric investigation on {h2o+nano3+peg1500} mixtures were made at t=308.15k, using electrochemical cells with two ion-selective electrodes, (na+ glass) as the cation ion-selective electrode against (no3- solvent-polymer pvc) as the anion ion-selective electrode. the mean ionic activity coefficients of nano3 were measured at different concentrations of  nano3 and peg. maximum concentrati...

Journal: :The Journal of biological chemistry 1966
B Chance L Mela

1. Bromthymol blue added to rat liver mitochondria at concentrations in the range 0.4 to 4.0 mpmoles per mg of protein is tightly bound as indicated by centrifugation and washing of the mitochondria. 2. The absorbance of the dye is increased on adding Ca++ or Mn++ to the mitochondria in the absence of a permeant anion. The extent of increase is 0.03 cm-l for 167 PM Ca++ at 618 rnp for 0.5 mpmol...

2014
Gengchen Liu Tolga Kaya

This paper presents an application for measuring the concentration of hydrogen ion by using ion selective electrodes. By this research we hope to provide useful information and verify the feasibility of measuring the concentration of other ions in the same way for sensing sweat. In this research, a pH electrode is used to generate an electrical potential which reflects the concentration of hydr...

1938
C. L. Pasricha R. K. Goyal S. Lal

Howe and Hawk (1912) were the first to determine the exact hydrogen-ion concentration of human fjeces. They examined samples of fa}ces from three individuals and found that the reaction of the material examined by them was always alkaline, varying with the different subjects and conditions from pH 7.01 to 8.77. Nelson and Williams (1916) recorded that 29 of the 30 individuals examined by them p...

2015
L. T. Bach

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