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- Komaguchi, K, et al.
(författare)
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An ESR and ENDOR study of irradiated 6Li-formate
- 2007
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Ingår i: Spectrochimica Acta Part A - Molecular and Biomolecular Spectroscopy. - : Elsevier BV. - 1386-1425 .- 1873-3557. ; 66:3, s. 754-760
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Tidskriftsartikel (refereegranskat)abstract
- Lithium formate (6LiOOCH·H2O), 95% 6Li enrichment, combined with an exchange of crystallization water with D2O was investigated. The ESR spectrum of the radiation induced free radicals stable at room temperature consists of a singlet with a narrow line width, 0.92 mT. 6Li has smaller magnetic moment and nuclear spin, which resulted in the narrower line width accompanied with an increase in peak amplitude. In comparison with lithium formate with natural isotopic composition, 6Li (7.5%, I = 1) and 7Li (92.5%, I = 3/2), the sensitivity was increased by a factor of two. With optimised spectrometer settings 6Li formate had seven times higher sensitivity compared to alanine. Therefore this material is proposed as a dosimeter material in a dose range down to 0.1 Gy. The g and the 13C-hyperfine (hf) tensors of the CO2- radical anion, major paramagnetic products, were evaluated to be g = (2.0037, 1.9975, 2.0017), and A(13C) = (465.5, 447.5, 581.3) MHz for polycrystalline samples at room temperature. Furthermore, the 1H-hf and 6Li-hf tensors observed for the surroundings of CO2- by ENDOR technique were in fairly good agreement with DFT calculations. The CO2- radicals are found to be so stable that the formate is applicable to the ESR dosimetry, because of fully relaxing in a fully relaxed geometrical structure of the CO2- component and remaining tight binding with the surroundings after the H atom detachment from HCO2-. © 2006 Elsevier B.V. All rights reserved.
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- Matsubara, K, et al.
(författare)
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Bone mineral density in end-stage renal disease patients: association with wasting, cardiovascular disease and mortality
- 2008
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Ingår i: Blood purification. - : S. Karger AG. - 1421-9735 .- 0253-5068. ; 26:3, s. 284-290
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Tidskriftsartikel (refereegranskat)abstract
- <i>Background:</i> Bone and mineral disorders may contribute to extraosseous ossifications and cardiovascular disease (CVD) in end-stage renal disease (ESRD) patients. We have investigated the relationship between bone mineral density (BMD) and inflammation, wasting, CVD and mortality in ESRD patients. <i>Methods:</i> BMD (dual energy X-ray absorptiometry) and biochemical, nutritional and inflammatory markers were assessed in 277 incident ESRD patients (GFR 7.1 ± 0.2 ml/min) who were then followed prospectively for a mean of 27 (range 1–60) months. Carotid plaques were determined in 103 patients. <i>Results:</i> Patients with carotid plaques, clinical manifestation of CVD and wasting (assessed by subjective global assessment) had significantly lower BMD than their counterparts. Low BMD was associated with high all-cause and cardiovascular mortality. Even after adjustment for several confounders and risk factors, all-cause (HR = 2.1, CI: 1.1–3.9, p = 0.02) and cardiovascular (HR = 2.8, CI: 1.2–6.3, p = 0.02) mortality remained significantly associated with low BMD. <i>Conclusions:</i> Low BMD is associated with wasting and CVD, and is an independent predictor of all-cause and cardiovascular mortality in ESRD patients.
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