The species-specific acid-base and multinuclear magnetic resonance properties of selenocysteamine, selenocysteine, and their homodiselenides

2020 ◽  
Vol 741 ◽  
pp. 137076 ◽  
Author(s):  
Tamás Pálla ◽  
Arash Mirzahosseini ◽  
Béla Noszál
Keyword(s):  
Magnetic Resonance ◽  
Acid Base ◽  
Resonance Properties ◽  
Species Specific ◽  
Multinuclear Magnetic Resonance

Total weak acid concentration and effective dissociation constant of nonvolatile buffers in human plasma

2001 ◽  
Vol 91 (3) ◽  
pp. 1364-1371 ◽  
Author(s):  
Peter D. Constable
Keyword(s):  
Dissociation Constant ◽  
Human Plasma ◽  
Total Concentration ◽  
Weak Acid ◽  
Strong Ion Difference ◽  
Acid Base ◽  
Horse Plasma ◽  
Using Data ◽  
Species Specific

The strong ion approach provides a quantitative physicochemical method for describing the mechanism for an acid-base disturbance. The approach requires species-specific values for the total concentration of plasma nonvolatile buffers (Atot) and the effective dissociation constant for plasma nonvolatile buffers ( K a), but these values have not been determined for human plasma. Accordingly, the purpose of this study was to calculate accurate Atot and K a values using data obtained from in vitro strong ion titration and CO2tonometry. The calculated values for Atot (24.1 mmol/l) and K a (1.05 × 10−7) were significantly ( P < 0.05) different from the experimentally determined values for horse plasma and differed from the empirically assumed values for human plasma (Atot = 19.0 meq/l and K a = 3.0 × 10−7). The derivatives of pH with respect to the three independent variables [strong ion difference (SID), Pco 2, and Atot] of the strong ion approach were calculated as follows: [Formula: see text] [Formula: see text], [Formula: see text]where S is solubility of CO2 in plasma. The derivatives provide a useful method for calculating the effect of independent changes in SID+, Pco 2, and Atot on plasma pH. The calculated values for Atot and K a should facilitate application of the strong ion approach to acid-base disturbances in humans.

Application of Nuclear Magnetic Resonance to the Study of Acid‐Base Equilibria

1957 ◽  
Vol 27 (3) ◽  
pp. 641-642 ◽  
Author(s):  
Ernest Grunwald ◽  
A. Loewenstein ◽  
S. Meiboom
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Acid Base ◽  
Nuclear Magnetic

scholarly journals Magnetic and resonance properties of the Y0.5Sr0.5Cr0.5Mn0.5O3 polycrystal

2021 ◽  
Vol 2103 (1) ◽  
pp. 012199
Author(s):  
G S Patrin ◽  
M M Mataev ◽  
K Zh Seitbekova ◽  
Ya G Shiyan ◽  
V G Plekhanov
Keyword(s):  
Magnetic Resonance ◽  
Field Line ◽  
High Field ◽  
Magnetic Ordering ◽  
Absorption Lines ◽  
Ferromagnetic Interaction ◽  
Low Field ◽  
Resonance Properties ◽  
Field Peak ◽  
Ferromagnetic Particles

Abstract The magnetostatic and magnetic resonance properties of the Y0.5Sr0.5Cr0.5Mn0.5O3 polycrystalline system have been experimentally studied. The intracrystalline ferromagnetic interaction turned out to be prevalent while the intercrystalline interaction appears to have antiferromagnetic character. We found that two absorption lines are observed in the spectrum in the magnetic ordering region at T < 80 K. The high-field line corresponds to the interacting parts of polycrystal related to the disordered shells and the low-field peak is system of ferromagnetic particles.

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