Unusual Behavior of lon Transport Mediated by Polyene Antibiotics. Activation Energies for the Exchange of Na+ Ions through Liposomal Membranes Studied by 23Na-NMR Spectroscopy.

1997 ◽  
Vol 45 (3) ◽  
pp. 431-436 ◽  
Author(s):  
Atsuomi KIMURA ◽  
Naohito KUNI ◽  
Hideaki FUJIWARA
Keyword(s):  
Nmr Spectroscopy ◽  
Activation Energies ◽  
Unusual Behavior ◽  
Polyene Antibiotics ◽  
Liposomal Membranes ◽  
Na Ions ◽  
23Na Nmr

Solid-state 23Na NMR spectroscopy studies of ordered and disordered cellulose nanocrystal films

2019 ◽  
Vol 97 ◽  
pp. 31-39 ◽  
Author(s):  
Ryutaro Ohashi ◽  
Carl A. Michal ◽  
Wadood Y. Hamad ◽  
Thanh-Dinh Nguyen ◽  
Motohiro Mizuno ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Cellulose Nanocrystal ◽  
Nanocrystal Films ◽  
Spectroscopy Studies ◽  
23Na Nmr

27Al and 23Na NMR spectroscopy and structural modeling of aluminofluoride minerals

2007 ◽  
Vol 92 (1) ◽  
pp. 34-43 ◽  
Author(s):  
B. Zhou ◽  
B. L. Sherriff ◽  
J. S. Hartman ◽  
G. Wu
Keyword(s):  
Nmr Spectroscopy ◽  
Structural Modeling ◽  
23Na Nmr

Multiaxial Reorientationsof ND+4 Ions Studied by 2H-NMR Spectroscopy

1991 ◽  
Vol 46 (10) ◽  
pp. 829-840 ◽  
Author(s):  
Z. T. Lalowicz ◽  
S. F. Sagnowski
Keyword(s):  
Nmr Spectroscopy ◽  
Density Matrix ◽  
Nmr Spectra ◽  
Activation Energies ◽  
Matrix Formalism ◽  
2H Nmr ◽  
Jump Frequency ◽  
H Nmr ◽  
2H Nmr Spectroscopy ◽  
Density Matrix Formalism

AbstractThe density matrix formalism is used to simulate motional averaging in the 2H-NMR spectra of reorienting ND+4 ions. The development of the spectra under increasing jump frequency about a single C3 or C2 axis is followed. Next we assume a hierarchy of axes in terms of activation energies sufficient to reach extreme narrowing conditions for some axes before activating jumps about a next one. Primary reorientations about the fastest C3 or C2 symmetry axes define the shape of spectra, the width of which is then stepwise reduced by fast reorientations about the subsequent axes in a postulated sequence of statistically uncorrelated jumps.

23Na-NMR measurements of intracellular sodium in intact perfused ferret hearts during ischemia and reperfusion

1990 ◽  
Vol 259 (6) ◽  
pp. H1767-H1773 ◽  
Author(s):  
M. M. Pike ◽  
M. Kitakaze ◽  
E. Marban
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Acetic Acid ◽  
Nmr Spectroscopy ◽  
Contractile Function ◽  
Shift Reagent ◽  
Ischemia And Reperfusion ◽  
The Mean ◽  
Severe Ischemia ◽  
23Na Nmr ◽  
Peak Value

23Na nuclear magnetic resonance (NMR) spectroscopy was utilized to measure intracellular Na+ in perfused ferret hearts exposed to the shift reagent dysprosium triethylenetramine-hexa-acetic acid [Dy(TTHA)3-]. The intracellular Na+ signal was small under normal perfusion conditions; resolution was enhanced by using a Jump-Return NMR pulse protocol. During 20 min of total global ischemia at 30 degrees C, intracellular Na+ concentration ([Na+]i) increased steadily to a peak value fivefold greater than control. [Na+]i declined monotonically back to control levels within 9 min of reperfusion. In contrast, the mean contractile pressure only recovered to 54% of control levels. Thus major alterations in Na+ homeostasis occur during severe ischemia. [Na+] recovers rapidly during reperfusion and is therefore dissociated from the lingering postischemic depression of contractile function known as "stunning."

Shift-Reagent–Aided 23Na NMR Spectroscopy

1989 ◽  
Vol 24 (12) ◽  
pp. 1028-1033 ◽  
Author(s):  
GABRIEL A. ELGAVISH
Keyword(s):  
Nmr Spectroscopy ◽  
Shift Reagent ◽  
23Na Nmr

Effects of ischemia on intracellular sodium and phosphates in the in vivo rat liver

1996 ◽  
Vol 81 (3) ◽  
pp. 1395-1403 ◽  
Author(s):  
Z. F. Xia ◽  
J. W. Horton ◽  
P. Y. Zhao ◽  
E. E. Babcock ◽  
A. D. Sherry ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Atomic Absorption ◽  
Rat Liver ◽  
Absorption Spectroscopy ◽  
Atomic Absorption Spectroscopy ◽  
31P Nmr ◽  
Ischemic Injury ◽  
Nmr Spectrum ◽  
23Na Nmr

Metabolic factors that influence the transition form reversible to irreversible ischemic injury were studied in the rat liver in vivo with 31P-nuclear magnetic resonance (NMR) spectroscopy. Hepatic ischemia for 15, 35, or 65 min was produced by occlusion of the hepatic artery and portal vein in rats. Ischemia caused a rapid decrease in the ATP concentration ([ATP])-to-P(i) concentration ratio and pH within 5 min, but there was little change in these variables detectable by 31P-NMR with longer periods of ischemia. After reperfusion, the [ATP] and P(i) concentration returned toward normal values in livers exposed to 15 or 35 min of ischemia, but 65 min of ischemia were associated with only modest recovery in [ATP], and the [ATP] later decreased. Because the 31P-NMR spectrum was similar after brief compared with prolonged ischemia, it appears that neither ATP depletion, P(i) accumulation, nor acidosis predicts metabolic recovery. Hepatic intracellular NA+ was also measured in separate groups of animals by 23Na-NMR in the presence of a shift agent, thulium (III) 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetrakis (methylene-phosphonate) (TmDOTP5-), and by atomic absorption spectroscopy. Under baseline conditions, the concentration of intracellular Na+ was 15.2 mM by atomic absorption spectroscopy and 16.5 mM by 23Na-NMR. Although the 31P-NMR spectrum responded very rapidly to the onset of ischemia, intracellular Na+ concentration measured by 23Na-NMR increased gradually but steadily at approximately 1.0 mM/min during early (up to 15 min) ischemia. These observations demonstrate that a rise in intracellular Na+ does occur early ischemia, that TmDOTP5- can be applied in vivo for analysis of intracellular Na+ in the ischemic liver, and that 31P-NMR spectroscopy is very sensitive to early ischemic injury.

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