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Potassium Isotopes (1):
Recent article
Potassium Isotopes
Abstract
A new grass-certified reference material characterized for (137)Cs and (40)K has been issued by the International Atomic Energy Agency. Characterization of this material was conducted by a group of national metrological institutes and expert laboratories. The paper describes the process for assignin...
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PMID: 18502138
PDF is available here.
PDF is available here.
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Plant Physiology (147)4 2008
Abstract
We evaluated the capability of these techniques to monitor transport pathways and processes in xylem and associated tissues using supplementary sodium (Na) and tracers for potassium (K), rubidium (Rb), and (41)K added to the transpiration stream. Cryo-ToF-SIMS imaging produced detailed mappings of w...
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PMID: 18567833
PDF is available here.
PDF is available here.
Abstract
We have observed subtle but significant contributions of chemical shift anisotropy with values up to 45 ppm, a first such observation. Careful analysis of static and MAS spectra allows the observation of the various chemical shift and quadrupole coupling tensor components as well as their relative o...
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PMID: 17228903
PDF is available here.
PDF is available here.
Tree Physiology (26)5 2006
Abstract
We used stable isotopes to quantify N, K and Mg in new shoots of Sitka spruce (Picea sitchensis (Bong.) Carr.) seedlings and to compare the relative contributions from current uptake and internal cycling. Two-year-old Sitka spruce seedlings were labeled with (15)N, (41)K and (26)Mg in an abundant or...
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PMID: 16452081
PDF is available here.
PDF is available here.
Abstract
(39)K nuclear magnetic resonance was used to measure the efflux of K(+) from suspensions of human erythrocytes [red blood cells (RBCs)], that occurred in response to the calcium ionophore, A23187 and calcium ions; the latter activate the Gárdos channel. Signals from the intra- and extracellular p...
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PMID: 16341859
PDF is available here.
PDF is available here.
Body composition during GH replacement in adults - methodological variations with respect to gender.
Abstract
These results suggest that gender differences in body composition in response to GH treatment are small, if adjustments are made for baseline factors such as age, BMI and dose of GH. Different methods of body composition measurements produce different results, but changes in response to GH administr...
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PMID: 16556717
PDF is available here.
PDF is available here.
Abstract
Metabolite concentrations and muscle pH were similar for patients and controls at lower workloads. At maximal dynamic and static contractions the concentration of inorganic phosphate was lower and at static contractions the pH decrease was smaller in patients. The performed work by patients was only...
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PMID: 12892249
PDF is available here.
PDF is available here.
Abstract
Europium and Texas Red can be detected by confocal microscopy. Europium, iron and gadolinium can be detected by secondary ion mass spectrometry (SIMS) microscopy. Studies confirmed the complementarity of both microscopies. They also confirmed the possibility of using europium as a model of gadoliniu...
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PMID: 12408562
PDF is available here.
PDF is available here.
Abstract
This study tested the hypothesis that the NKCC is involved in volume regulation, specifically regulatory volume increase (RVI), in resting skeletal muscle. Neurally and vascularly isolated rat hindlimbs were perfused with a bovine erythrocyte perfusate containing (42)K or (86)Rb as markers of unidir...
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PMID: 12438764
PDF is available here.
PDF is available here.
Peritoneal Dialysis International (21 Suppl 3) 2001
Abstract
Total body potassium is a valid, noninvasive technique for measuring FFM and BCM in PD patients. In our PD patient group, depletion of FFM and BCM as compared with controls was identified in the women but not in the men....
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PMID: 11887813
PDF is available here.
PDF is available here.
Abstract
K(+) uptake rates were measured in the anterior (An) and posterior (Pos) LV walls of pig hearts before and after regional ischemia and reperfusion using Rb(+) as a K(+) congener and 3D (87)Rb NMR imaging and spectroscopy as detection methods. The hearts were perfused by the Langendorff method with K...
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PMID: 10893525
PDF is available here.
PDF is available here.
Abstract
Biochemistry and Cell Biology (76)2-3 1998
Abstract
I describe a few recent developments in NMR studies of quadrupolar nuclei and demonstrate the potential of solid-state quadrupolar NMR in the study of biological systems. In particular, I discuss the application of solid-state NMR of (17)O, 67Zn, 59Co, 23Na, and 39K nuclei with a prognosis for futur...
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PMID: 9923712
PDF is available here.
PDF is available here.
Abstract
We injected 4-day-old neonatal mice with pure stable isotope 41K, equal to approximately 5% of their total body K. Calvariae were dissected 24 h later and then cultured for 24 h in medium without added 41K, either at pH approximately 7.4 (Ctl) or at pH approximately 7.1 (Ac), with or without the ost...
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PMID: 9333127
PDF is available here.
PDF is available here.
Abstract
Knowledge of the extent and location of viable tissue is important to clinical diagnosis. In principle, sodium (23Na) and potassium (39K) MRI could noninvasively provide information about tissue viability. In practice, imaging of these nuclei is difficult because, compared with water protons (1H), 2...
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PMID: 9324333
PDF is available here.
PDF is available here.
Abstract
We examined the K+ transport pathways in the lamprey red blood cells using 86Rb and stable isotope 41K as tracers measured by the mass spectrometric method. Upon replacing 4 mmol/l K+ with 4 mmol/l Rb+ in the incubation medium, the rate coefficient for unidirectional 86Rb influx (Kin) was significan...
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PMID: 9452948
PDF is available here.
PDF is available here.
Abstract
Addition of monesin to preparations of large unilamellar vesicles made from egg yolk phosphatidylcholine (EPC) in sodium or potassium chloride solution and from dioleoylphosphatidylcholine (DOPC) in sodium chloride solutions gives rise to dynamic 23Na- and 39K-NMR spectra. The dynamic spectra arise...
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PMID: 3179291
PDF is available here.
PDF is available here.
Röntgenpraxis (39)10 1986
Abstract
Abstract
1. Serial measurements of serum potasssium and total-body potassium were made on eighteen patients with megaloblastic anaemia before the start of therapy and during the period of recovery. 2. In those patients who presented with an initial packed cell volume of less than 25%, a mean decrease in ser...
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PMID: 1149398
PDF is available here.
PDF is available here.
Abstract
Ten to twenty millimoles per liter Mg did not affect 42-K exchange in control isolated blood-perfused rabbit septa, but abolished acetyl strophanthidin (ACS)-induced net 42-K loss (constant heart rate) without attenuating the mechanical response. In six septa ACS-induced net K loss was reduced from...
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PMID: 1130559
PDF is available here.
PDF is available here.
Circulation (51)4 1975
Abstract
These results suggest that thallium-201 can be used for the evaluation of the distribution of regional myocardial perfusion....
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PMID: 1116254
PDF is available here.
PDF is available here.
Nutrition Reviews (33)3 1975
Abstract
Abstract
Thallium-201 merits evaluation for myocardial visualization, kidney studies, and tumor diagnosis because of its physical and biologic properties. A method is described for preparation of this radiopharmaceutical for human use. A critical evaluation of 201Tl and other radiopharmaceuticals for myocard...
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PMID: 1110421
PDF is available here.
PDF is available here.
Abstract
Abstract
The body electrolyte composition of 34 patients with severe chronic obstructive pulmonary disease and without complications or medications known to influence body sodium or potassium was studied. Exchangeable sodium, exchangeable potassium, extracellular water, and total body water were measured usi...
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PMID: 1089374
PDF is available here.
PDF is available here.
Abstract
The emergence in the past 20 years of nuclear medicine as a distinct diagnostic discipline has been a major clinical advance. The relatively rapid evolution from the small laboratory limited primarily to the study of thyroid disease to the large unit in which radioactive tracers (radionuclides) are...
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PMID: 1088928
PDF is available here.
PDF is available here.
Journal of Bacteriology (121)1 1975
Abstract
The effect of external Na plus concentration on the transport of K plus was studied using K plus-depleted cells of a marine pseudomonad. K plus transport was found to be a saturable process and requires Na plus. The initial rates for K plus transport over a range of external K plus concentrations we...
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PMID: 1116986
PDF is available here.
PDF is available here.
Archives of Surgery (110)1 1975
Abstract
In nine patients with lower extremity symptoms of arterial insufficiency, potassium chloride K 43 was injected intravenously during rest, reactive hyperemia, or exercise. Decreased radioactivity in muscle tissue was observed to correspond with symptoms, physical findings, Doppler ultrasound pressure...
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PMID: 1115610
PDF is available here.
PDF is available here.
Journal of Physiology (244)3 1975
Abstract
These results support the hypothesis that ATP is needed as a cofactor for K:K exchange to occur, and make it extremely unlikely that phosphorylation from ATP is involved....
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PMID: 124351
PDF is available here.
PDF is available here.
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Developmental Biology (41)2 1974
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Journal of Physiology (243)2 1974
Abstract
1. The efflux rate coefficients of sodium, potassium and chloride from immature oocytes of the toad Bufo bufo have been measured and found to be respectively, 0.0069, 0.0023 and 0.0034 min(-1).2. Replacement of external chloride by sulphate resulted in a fall in chloride efflux of about 50%. This ha...
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PMID: 4217360
PDF is available here.
PDF is available here.
Abstract
Abstract
Abstract
Age and Ageing (3)4 1974
Abstract
Total Exchangeable Potassium (TEK) was measured in 31 elderly patients admitted to a geriatric assessment unit. The value in control cases ranged between 26 mEq/kg to 45.5 mEq/kg; the mean values for men and women were 35.5 mEq/kg and 28.4 mEq/kg, respectively. The test was repeated after one week i...
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PMID: 4458428
PDF is available here.
PDF is available here.
Circulation (50)5 1974
Abstract
Journal of Bacteriology (120)2 1974
Abstract
Transport of K(+) by K(+)-depleted cells of marine pseudomonad B-16 (ATCC 19855) exhibited saturation kinetics. Rb(+) inhibited both K(+) transport and the K(+)-dependent transport of alpha-aminoisobutyric acid (AIB) into K(+)-depleted cells of the organism in proportion to the concentration of Rb(+...
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PMID: 4455685
PDF is available here.
PDF is available here.
Archives of Surgery (109)5 1974
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Journal of Dairy Science (57)11 1974
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Radiation data and reports (15)10 1974
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Journal of Cell Biology (63)1 1974
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Journal of Biological Chemistry (249)18 1974
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Circulation Research (35)3 1974
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FEBS Letters (44)2 1974
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Strahlentherapie (148)2 1974
Abstract