Studies With Ion Exchange Calcium Electrodes
نویسندگان
چکیده
منابع مشابه
Calcium ion exchange in crystalline gelsolin.
Gelsolin is a calcium and pH-sensitive modulator of actin filament length. Here, we use X-ray crystallography to examine the extraction and exchange of calcium ions from their binding sites in different crystalline forms of the activated N and C-terminal halves of gelsolin, G1-G3 and G4-G6, respectively. We demonstrate that the combination of calcium and low pH activating conditions do not indu...
متن کاملStudies of charge exchange in symmetric ion–ion collisions
We have measured the total cross sections for single charge exchange in He– He, Ne–Ne and Ar–Ar collisions at centre-of-mass energies of 1.8–14.8, 1.8–10.8 and 2.8–7.3 keV, respectively, using an intersecting beam technique. The results for He–He collisions are compared with existing measurements and calculations. For Ne–Ne and Ar–Ar the measured cross sections are compared with results from ne...
متن کاملSodium-calcium ion exchange in cardiac membrane vesicles.
Membrane vesicles isolated from rabbit ventricular tissue rapidly accumulated Ca2+ when an outwardly directed Na+ gradient was formed across the vesicle membrane. Vesicles loaded internally with K+ showed only 10% of the Ca2+ uptake activity observed with Na+-loaded vesicles. Dissipation of the Na+ gradient with the monovalent cation exchange ionophores nigericin or narasin caused a rapid decli...
متن کاملActivity and interference effects in measurement of ionized calcium with ion-selective electrodes.
We assessed the magnitude of the errors in ionized-calcium measurements resulting from changes in electrolyte composition for three different ion-selective electrodes: the Orion Model 93-20, the Radiometer F2112, and the Simon neutral carrier membrane electrode. We attempted to distinguish between errors arising from changes in calcium ion activity and those due to interferences in the electrod...
متن کاملIon Activity Scales for Use with Selective Ion-sensitive Electrodes
The development of a variety of selective ion-sensitive electrodes focuses attention on numerical scales for the activity of individual ionic species, for these electrodes measure the activity of the selected ion only relative to that of the same species in a reference solution of known or assigned ion activity. Nevertheless, scales of ion activity must be based on a convention from outside the...
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ژورنال
عنوان ژورنال: Gastroenterology
سال: 1971
ISSN: 0016-5085
DOI: 10.1016/s0016-5085(71)80005-7