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

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

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.

Detection of Electrochemical Reaction Products from the Sodium–Oxygen Cell with Solid-State 23Na NMR Spectroscopy

2017 ◽  
Vol 139 (2) ◽  
pp. 595-598 ◽  
Author(s):  
Zoë E. M. Reeve ◽  
Christopher J. Franko ◽  
Kristopher J. Harris ◽  
Hossein Yadegari ◽  
Xueliang Sun ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Electrochemical Reaction ◽  
Reaction Products ◽  
23Na Nmr

scholarly journals 23Na NMR Study of NASICON-type Compounds, Na1+xScxTi2–x(PO4)3

2000 ◽  
Vol 55 (1-2) ◽  
pp. 348-352 ◽  
Author(s):  
Hirotsugu Masui ◽  
Takahiro Ueda ◽  
Keisuke Miyakubo ◽  
Taro Eguchi ◽  
Nobuo Nakamura
Keyword(s):  
Nmr Spectroscopy ◽  
Axial Symmetry ◽  
Room Temperature ◽  
Chemical Exchange ◽  
The Other ◽  
Special Position ◽  
Nasicon Type ◽  
Nmr Study ◽  
Low Symmetry ◽  
23Na Nmr

The structure of NASICON-type compounds, Na1+xScxTi2-x(PO4)3 (O ≤ x ≤ 2), and the dynamics of Na+ have been investigated by 23Na NMR spectroscopy. It was found that the 23Na 1D and 2D MQMAS spectra depend on the Na concentration, suggesting strongly that the Na+ ions are distributed between two crystallographically nonequivalent sites, one is a special position with axial symmetry, and the other a position of low symmetry. The chemical exchange between these different sites in the crystal takes place at room temperature, which may cause the high Na ion conduction of this material

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