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Sodium Isotopes (1):
Recent article
Sodium Isotopes
Abstract
These results establish the feasibility of (23)Na TQF imaging and demonstrate that this method should be applicable for studying human disc tissues as well as spinal disc degeneration....
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PMID: 18774321
PDF is available here.
PDF is available here.
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Abstract
To prospectively determine whether the absolute tissue sodium concentration (TSC) increases in myocardial infarctions (MIs) in humans and whether TSC is related to infarct size, infarct age, ventricular dysfunction, and/or electrophysiologic inducibility of ventricular arrhythmias.
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PMID: 18566171
PDF is available here.
PDF is available here.
Abstract
We previously reported the vanadyl hyperfine couplings of VO(2+)-ATP and VO(2+)-ADP complexes in the presence of the nitrogenase Fe protein from Klebsiella pneumoniae (Petersen et al. in Biochemistry 41:13253-13263, 2002). It was demonstrated that different VO(2+)-nucleotide coordination environment...
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PMID: 18351402
PDF is available here.
PDF is available here.
Abstract
We report a solid-state (23)Na NMR study of monovalent cation (Li(+), Na(+), K(+), Rb(+), Cs(+) and NH(4) (+)) binding to double-stranded calf thymus DNA (CT DNA) at low relative humidity, ca 0-10%. Results from (23)Na--(31)P rotational echo double resonance (REDOR) NMR experiments firmly establish...
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PMID: 18306259
PDF is available here.
PDF is available here.
Abstract
Solid-state (23)Na and (31)P magic-angle spinning nuclear magnetic resonance spectroscopy and X-ray crystallography have been used to study the structures of the chain metaphosphates NaCa(PO(3))(3) and NaSr(PO(3))(3). The compounds are isostructural and crystallise in space group P(-1) with the foll...
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PMID: 18306173
PDF is available here.
PDF is available here.
Abstract
Significant decreases were observed for NAA (P < .001) and Glu (P = .004), and increases were observed for mIns (P = .003), Cho (P = .025), and sodium signal intensity (P < .001) in low-grade glioma tissue. Significant correlations (r(2) > 0.25) were observed between NAA and Glu (P < .05) and betwee...
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PMID: 18238848
PDF is available here.
PDF is available here.
Abstract
This paper proposes a method for estimating the detection limit, which is defined as 3.3 times the standard deviation (S.D.) of blank measurements under the situations where the repetition of measurement is difficult or impossible because of a short half-life of radioactivity. The FUMI theory, which...
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PMID: 17913431
PDF is available here.
PDF is available here.
Ukrainskij biokhimicheskij zhurnal/Ukrayins'kij biokhimichnij zhurnal/Ukrainian biochemical journal (80)4 2008
Abstract
Using diffusion weighted 1H, single-quantum 23Na and triple-quantum-filtered 23Na magnetic resonance imaging water apparent diffusion coefficient (ADC), total tissue Na+ and intracellular Na+ were monitored in hepatocellular carcinoma (HCC) in rats and in the surrounding liver tissue. The tumor wate...
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PMID: 19140459
PDF is available here.
PDF is available here.
Abstract
A method is described for the absolute quantification of double-quantum filtered spectra of spin-3/2 nuclei ((23)Na). The method was tested on a model system, a cationic exchange resin for which the number of Na(+) binding sites was quantitatively controlled. The theoretical and experimental approac...
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PMID: 17897852
PDF is available here.
PDF is available here.
Abstract
I Na-SG, retain the overall pattern of pure silica gel. Broad oscillations in the PDF show that added alkali metals remain in the pores as nanoscale metal clusters. 23Na MAS NMR studies confirm the presence of Na(0) and demonstrate that Na+ ions are formed as well. The relative amounts of Na(0) and...
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PMID: 17263423
PDF is available here.
PDF is available here.
Abstract
(23)Na MRI has the potential to noninvasively detect sodium (Na) content changes in vivo. The goal of this study was to implement (23)Na MRI in a clinical setting for neurooncological and muscular imaging. Due to the biexponential T(2) decay of the tissue Na signal with a short component, which rang...
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PMID: 17191248
PDF is available here.
PDF is available here.
Abstract
We present here a review of the use of MRS in animal models of epilepsy....
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PMID: 17767575
PDF is available here.
PDF is available here.
Abstract
The increase in the total 23Na signal intensity reflects intracellular changes, the cold-induced Na+ shifts are greatest and osmotically relevant in paramyotonia patients, and even osmotically irrelevant Na+ shifts can be detected by the implemented 23Na MR technique....
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PMID: 16931510
PDF is available here.
PDF is available here.
Abstract
We discuss the measured NMR parameters in relation to other studies of sodium in high coordination sites in the solid state....
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PMID: 16855721
PDF is available here.
PDF is available here.
Abstract
We present the practical design of a dual-frequency RF surface coil that provides (1)H and (23)Na images of the rat head at 4 T. The dual-frequency RF surface coil comprised of a large loop tuned to the (1)H frequency and a smaller co-planar loop tuned to the (23)Na frequency. The mutual coupling be...
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PMID: 16716616
PDF is available here.
PDF is available here.
Abstract
After exercising, all patients developed considerable weakness exclusively in the cooled lower leg; no weakness was observed in volunteers. In patients, all 23Na MR images showed a significant increase in 23Na signal intensity in the cooled lower leg (P < .001) in comparison with nonsignificant find...
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PMID: 16775221
PDF is available here.
PDF is available here.
Abstract
NMR spectra of (23)Na(+) and (133)Cs(+) in gelatine in a silicone rubber tube that was stretched to various extents showed remarkably reproducible resonance multiplicity. The relative intensities of the components of the split peaks had ratios, 3:4:3, and 7:12:15:16:15:12:7, respectively, that confo...
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PMID: 16556508
PDF is available here.
PDF is available here.
Abstract
Sodium density maps acquired with three SPRITE-based methods have been compared in terms of the resulting quantitative information as well as image quality and acquisition times. Consideration of factors relevant for the clinical implementation of SPRITE shows that the Conical-SPRITE variant is pref...
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PMID: 16325438
PDF is available here.
PDF is available here.
Abstract
The dynamics of 23Na during completely balanced steady-state free precession (SSFP) have been studied in numerical simulations and experiments. Results from both agree well. It is shown that during SSFP multiple quantum coherences are excited and that their excitation affects the observable signal....
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PMID: 16337416
PDF is available here.
PDF is available here.
Abstract
Our data suggest that alignment in the magnetic field of membrane proteins included into bicelles may be facilitated if the protein is folded as a beta-barrel structure....
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PMID: 16187128
PDF is available here.
PDF is available here.
Kidney International (69)4 2006
Abstract
The clinical detection of evolving acute tubular necrosis (ATN) and differentiating it from other causes of renal failure are currently limited. The maintenance of the corticomedullary sodium gradient, an indicator of normal kidney function, is presumably lost early in the course of ATN. Herein, sod...
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PMID: 16518333
PDF is available here.
PDF is available here.
Abstract
AHP excitation yielded a homogeneous excitation flip angle and negligible losses compared to a 90 degrees hard pulse wherever the B1 field exceeded the adiabatic threshold, rendering this sequence suitable for applications that use surface coil excitation. An AHP (23)Na TPI sequence was used with a...
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PMID: 15834912
PDF is available here.
PDF is available here.
Abstract
Periodic ab initio HF calculations using the CRYSTAL code have been used to calculate (23)Na NMR quadrupole parameters for a wide range of crystalline sodium compounds including Na(3)OCl. An approach is developed that can be used routinely as an alternative to point-charge modelling schemes for the...
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PMID: 15681132
PDF is available here.
PDF is available here.
Abstract
We performed (23)Na MRI in 12 rats on day 3 post-MI (N = 5) and after 6 weeks (N = 7). H&E and Picrosirius Red staining confirmed granulation tissue infiltrate on day 3 and scar formation after 6 weeks. MI/R decreased significantly from 1.91 +/- 0.45 on day 3 post-MI to 1.3 +/- 0.09 after 6 weeks. T...
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PMID: 15799052
PDF is available here.
PDF is available here.
Abstract
In the DW images, a myocardial signal-to-noise ratio (SNR) of 16.0 in the left ventricle and 8.5 in the septum (N = 4) was measured. With longer experimental duration (about 30 minutes; N = 3), the image quality and the SNR could be further improved (voxel size: 570 microL; SNR: blood 16.1, septum 1...
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PMID: 15611944
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1667)1 2004
Abstract
These results disclose that amphidinol 3 is one of few non-ionic compounds that possess potent membrane permeabilizing activity with non-detergent mechanism....
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PMID: 15533309
PDF is available here.
PDF is available here.
Abstract
Abstract
We report a solid-state (23)Na NMR study of the bound sodium cations in a G-quadruplex formed by Oxytricha nova telomere DNA repeat, d(G(4)T(4)G(4)) (Oxy-1.5). Using a 2D multiple-quantum magic-angle spinning (23)Na NMR method, we observed three sodium cations residing inside the quadruplex channel...
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PMID: 15451415
PDF is available here.
PDF is available here.
Abstract
Plots of normalized T1rho rate vs. FCD were found to be strongly correlated (R2 > 0.75 and 0.85) in both models with nearly the same slope of approximately 1/2 (P > 0.51). Loss of PG in bovine and human tissue was confirmed by histology. CONCLUSION: The strong correlation of the FCD and T1rho data i...
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PMID: 15332262
PDF is available here.
PDF is available here.
Abstract
We hypothesized that nonviable myocardium in humans would show elevated 23Na content at all stages of infarct development, and therefore could be imaged with 23Na MRI. Ten patients were examined on days 4, 14, and 90 after infarction, and five of these patients participated in a 12-month follow-up....
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PMID: 15334573
PDF is available here.
PDF is available here.
Abstract
These results demonstrate considerable regional variability and establish a foundation for future characterization of 23Na T*2 in conditions such as cerebral ischemia and cancer....
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PMID: 15282825
PDF is available here.
PDF is available here.
Abstract
We explain in terms of the bicontinuous topology of the cubic phase and a combination of tortuosity and bilayer permeability effects. We also propose numerical simulations which would enable the separation of the two effects. To our knowledge, this is the first study of ionophore-mediated cation dif...
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PMID: 15835134
PDF is available here.
PDF is available here.
Abstract
The splitting and the lineshape of the satellite transitions of 23Na are measures of the residual quadrupolar interaction and its distribution, which are related to the degrees of order and binding of sodium in biological tissues. However, these transitions are often masked by the stronger signals o...
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PMID: 14643710
PDF is available here.
PDF is available here.
Abstract
We conclude that a Delta GATP below -50 kJ/mol limits the Na+ pump and prevents maintenance of [Na+]i homeostasis....
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PMID: 12958035
PDF is available here.
PDF is available here.
Abstract
Longitudinal T(1) relaxation time components were 31.6+/-7.0 msec and 31.1+/-7.5 msec for myocardium and blood, respectively. CONCLUSION: (23)Na T(1) relaxation times of myocardium and blood can be determined in humans. The results are in agreement with values obtained from animal studies.
Copyright...
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PMID: 12766903
PDF is available here.
PDF is available here.
Abstract
59Co and 23Na NMR has been applied to the layered cobalt oxides NaCoO(2) and HCoO(2) at three different magnetic field strengths (4.7, 7.1 and 11.7T). The 59Co and 23Na quadrupole and anisotropic shift tensors have been determined by iterative fitting of the NMR line shapes at the three magnetic fie...
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PMID: 12787906
PDF is available here.
PDF is available here.
Abstract
Mean concentration (in millimoles per kilogram wet weight) was 61 +/- 8 (SD) for GM, 69 +/- 10 for WM, 135 +/- 10 for CSF, 113 +/- 14 for vitreous humor, 103 +/- 36 for tumor, 68 +/- 11 for unaffected contralateral tissue, and 98 +/- 12 for FLAIR hyperintense regions surrounding tumors. Significant...
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PMID: 12663825
PDF is available here.
PDF is available here.
Abstract
The Na+ transporting properties of the first member of a new class of artificial ionophores, based on a C2-symmetric polyhydroxylated steroid dimer, are described.
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PMID: 12536819
PDF is available here.
PDF is available here.
Abstract
We have recently reported phospholipid bicelles (bilayered micelles) that have positive anisotropy of the magnetic susceptibility and align with their normals parallel to an external magnetic field [J. Am. Chem. Soc. 2001, 123, 1537]. Improvements have been made via the synthesis of a new phospholip...
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PMID: 12296750
PDF is available here.
PDF is available here.
Abstract
Our work demonstrates that the previously measured NMR parameters are in error because the relative humidity of the system had not been controlled, rendering the results irreproducible....
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PMID: 12421091
PDF is available here.
PDF is available here.
Analytical Biochemistry (306)2 2002
Abstract
In order to measure intracellular sodium concentrations in resting cells of Fibrobacter succinogenes S85 by (23)Na NMR spectrometry, two methodological aspects were studied. First, three different shift reagents (Dy(PPP(i))(7-)(2), Tm(DOTP)(5-), and Dy(TTHA)(3-)) were tested for their ability to sep...
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PMID: 12123653
PDF is available here.
PDF is available here.
Abstract
One of the initiating steps of osteoarthritis is the loss of proteoglycan (PG) molecules from the cartilage matrix. One method for assessing cartilage integrity, therefore, is to measure the PG content or fixed charge density (FCD) of cartilage. This report shows the feasibility of calculating FCD b...
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PMID: 11810671
PDF is available here.
PDF is available here.
Abstract
We measured unidirectional ion fluxes of fish collected directly from the Rio Negro, an extremely dilute, acidic blackwater tributary of the Amazon. Kinetic analysis of Na(+) uptake revealed that most species had fairly similar J(max) values, ranging from 1,150 to 1,750 nmol g(-1) h(-1), while K(m)...
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PMID: 11880976
PDF is available here.
PDF is available here.
Abstract
The 23Na NMR quadrupolar relaxation in NaDNA aqueous solutions has been investigated in the presence of D(+) and L(-) arabitol. Quite different results were produced by the enantiomers, i.e. the addition of D(+) arabitol produced a small increase of the 23Na NMR relaxation rates, while in the presen...
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PMID: 11718819
PDF is available here.
PDF is available here.
Journal of Bacteriology (183)20 2001
Abstract
GerN, a Bacillus cereus spore germination protein, exhibits homology to a widely distributed group of putative cation transporters or channel proteins. GerN complemented the Na(+)-sensitive phenotype of an Escherichia coli mutant that is deficient in Na(+)/H(+) antiport activity (strain KNabc). GerN...
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PMID: 11566988
PDF is available here.
PDF is available here.
Abstract
Sodium gradients (DeltapNa) were measured in resting cells of Fibrobacter succinogenes by in vivo 23Na nuclear magnetic resonance using Tm(DOTP)5- [thulium(III) 1,4,7,10-tetraazacyclododecane-N',N",N"'-tetramethylenephosphonate] as the shift reagent. This bacterium was able to maintain a DeltapNa of...
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PMID: 11526055
PDF is available here.
PDF is available here.
Abstract
MRI of total sodium (Na) content may allow assessment of myocardial viability, but information on Na content in normal myocardium, necrotic/scar tissue, and stunned or hibernating myocardium is lacking. Thus, the aims of the study were to: 1) quantify the temporal changes in myocardial Na content po...
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PMID: 11323801
PDF is available here.
PDF is available here.
Abstract
Normalization of intracellular sodium (Na) after postischemic reperfusion depends on reactivation of the sarcolemmal Na(+)-K(+)-ATPase. To evaluate the requirement of glycolytic ATP for Na(+)-K(+)-ATPase function during postischemic reperfusion, 5-s time-resolution 23Na NMR was performed in isolated...
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PMID: 11299221
PDF is available here.
PDF is available here.
NMR in Biomedicine (14)2 2001
Abstract
I = 3/2 nucleus, the DQ coherences can also be formed in isotropic media. By a judicial choice of the pulse angle in the DQ pulse sequence only the DQ coherences arising from anisotropic motion are detected. For I = 1 nuclei such as 2H, DQF spectra can be observed only in ordered structures. Thus, t...
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PMID: 11320537
PDF is available here.
PDF is available here.
Abstract
Regions of high (23)Na content correlate well with the TTC-defined infarct and may be a quantitative in vivo marker for dead tissue. In contrast, the dynamics of the (1)H T2 and ADC make it difficult to interpret these images without additional information because they may appear normal despite infa...
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PMID: 11283393
PDF is available here.
PDF is available here.
Abstract
Cell volumes decreased in HeLa cells as a function of time after seeding during exponential growth. Cell volume distributions revealed the presence of two cell populations in all stages of growth. When cells approached confluence, the ratio of the two populations abruptly shifted towards that charac...
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PMID: 11302524
PDF is available here.
PDF is available here.
Abstract
Elevated 23Na MR image signal intensity demonstrates subacute myocardial infarction in patients....
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PMID: 11079085
PDF is available here.
PDF is available here.
Abstract
(23)Na NMR microimaging is described to map, for the first time, the sodium distribution in living plants. As an example, the response of 6-day-old seedlings of Ricinus communis to exposure to sodium chloride concentrations from 5 to 300 mM was observed in vivo using (23)Na as well as (1)H NMR micro...
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PMID: 10828197
PDF is available here.
PDF is available here.
Abstract
A new iterative extrapolation image reconstruction algorithm is presented, which enhances low resolution metabolic magnetic resonance images (MRI) with information about the bounds of signal sources obtained from a priori anatomic proton ((1)H) MRI. The algorithm ameliorates partial volume and ringi...
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PMID: 10788724
PDF is available here.
PDF is available here.
Abstract
We describe the characterization of a (23)Na temperature-dependent chemical shift and relaxation rates in the complex, Na(4)HTm[DOTP]. This is the first characterization of a (23)Na temperature-dependent chemical shift in a nonmetallic sample. The (23)Na temperature-dependent chemical shift coeffici...
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PMID: 10698662
PDF is available here.
PDF is available here.
Abstract
The application of continuous wavelet transform (CWT) analysis technique is presented to analyze multiple-quantum-filtered (MQF) (23)Na magnetic resonance spectroscopy (MRS) data. CWT acts on the free-induction-decay (FID) signal as a time-frequency variable filter. The signal-to-noise ratio (SNR) a...
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PMID: 10648152
PDF is available here.
PDF is available here.
Abstract
Despite their proven gains in signal-to-noise ratio and field-of-view for routine clinical MRI, phased-array detection systems are currently unavailable for nuclei other than protons (1H). A broadband phased-array system was designed and built to convert the 1H transmitter signal to the non-1H frequ...
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PMID: 10680691
PDF is available here.
PDF is available here.
Abstract
We have created sodium distribution maps of the cartilage, showing for the first time, spatial variations of sodium concentration in intact cartilage. This average concentration measurement correlates very well with the values obtained from the spectroscopic methods. Furthermore, sodium was found to...
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PMID: 10617432
PDF is available here.
PDF is available here.
Abstract
High-temperature 33Na MAS NMR experiments up to 873 K for a number of different sodalites (Na8[AlSiO4]6(NO3)2, Na8[AlSiO4]6(NO2)2, Na8[AlSiO4]6I2, Na7.9[AlSiO4]6(SCN)7.9 x 0.5H2O, Na8[AlGeO4]6(NO3)2, and Na7[AlSiO4]6(H3O2) x 4H2O) were carried out. The spectra of the first five sodalites consist of...
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PMID: 11270743
PDF is available here.
PDF is available here.
Abstract
A rigorous examination of the various multiple-quantum magic angle spinning sequences is carried out with reference to sensitivity enhancement in the isotropic dimension and the lineshapes of the corresponding MAS peaks in the anisotropic dimension. An echo efficiency parameter is defined here, whic...
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PMID: 11270738
PDF is available here.
PDF is available here.