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Calcium Isotopes (1):
Recent article
Calcium Isotopes
Abstract
Our study sought to determine whether a dual isotope method using a single serum sample obtained 4 h after administration of the initial isotope provides a useful approach to measure fractional calcium absorption. Following a metabolic diet with a fixed calcium intake of 30 mmol/day for 10 days, nin...
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PMID: 19856249
PDF is available here.
PDF is available here.
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Abstract
Assessment of calcium bioavailability from non-dairy foods containing moderate amounts of calcium is especially important in populations that have habitually low dairy consumption. Absorption of calcium from milk and tempeh (a traditional fermented soy product) was compared in a sample of Malay subj...
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PMID: 19995131
PDF is available here.
PDF is available here.
Abstract
Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the...
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PMID: 19074345
PDF is available here.
PDF is available here.
Abstract
We conclude that the hexagonal P6(3)/mmc space group provides a better representation of the structure than does the orthorhombic Pbnm space group, thereby demonstrating the utility of (43)Ca solid-state NMR as a complementary tool to X-ray crystallographic methods....
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PMID: 18576634
PDF is available here.
PDF is available here.
Abstract
Natural abundance (43)Ca solid-state NMR of hydroxyapatite (Ca(10)(PO(4))(6)(OH)(2)) was performed at three different fields (8.45, 14.1 and 18.8 T). The two crystallographically distinct calcium sites of the apatite structure were spectroscopically resolved at 18.8 T. The (43)Ca NMR interaction par...
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PMID: 18306258
PDF is available here.
PDF is available here.
Abstract
Abstract
We report the first 1H and 43Ca NMR characterization of Ca2+ ion binding to G-quartets.
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PMID: 18478689
PDF is available here.
PDF is available here.
Abstract
We have modified carrots to express increased levels of a plant calcium transporter (sCAX1), and these plants contain approximately 2-fold-higher calcium content in the edible portions of the carrots. However, it was unproven whether this change would increase the total amount of bioavailable calciu...
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PMID: 18202180
PDF is available here.
PDF is available here.
Abstract
Mean Ca absorption with PGA was significantly higher (P < 0.01) than without PGA, 39.1 (SE 1.6) % and 34.6 (SE 1.9) %, respectively. The effect of PGA on increasing Ca absorption was more marked in a sub-group of subjects whose baseline Ca absorption (without PGA) was lower than the population mean...
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PMID: 18187428
PDF is available here.
PDF is available here.
Abstract
An inductively coupled plasma mass spectrometer with dynamic reaction cell (ICP-DRC-MS) was optimized for determining (44)Ca/(40)Ca isotope ratios in aqueous solutions with respect to (i) repeatability, (ii) robustness, and (iii) stability. Ammonia as reaction gas allowed both the removal of (40)Ar+...
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PMID: 17880181
PDF is available here.
PDF is available here.
Abstract
This novel and non-aggressive protocol allowed the in vivo comparison of calcium utilization from two different dairy sources, revealing a higher acute calcium assimilation from fresh as compared to the pasteurized yoghurt, in both lactose digesting and maldigesting subjects....
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PMID: 17634175
PDF is available here.
PDF is available here.
Clinical Chemistry (53)6 2007
Abstract
Urine delta(44)Ca values during bed rest were lower in controls than in individuals treated with alendronate (P <0.05, ANOVA) or exercise (P <0.05), and lower than the control group baseline (P <0.05, t-test). Results were consistent with the model and with biochemical and bone mineral density data....
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PMID: 17463176
PDF is available here.
PDF is available here.
Effect of lactulose on calcium and magnesium absorption: a study using stable isotopes in adult men.
Abstract
We performed a clinical trial with a double-blind, randomized, crossover design in 24 healthy adult male volunteers. The absorptions of Ca and Mg were evaluated by a single-labeling method using stable isotopes. The test foods, containing lactulose at a dose of 0 g (placebo), 2 g (low-dose), or 4 g...
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PMID: 17484373
PDF is available here.
PDF is available here.
Abstract
We determined true fractional calcium absorption (TFCA), true Ca absorption(= TFCA x Ca intake, Va), urinary Ca excretion (Vu,) and the difference between Va and Vu, (Va-u), in response to three dietary Ca intake levels. Twenty-one healthy postmenopausal Chinese women aged 49-64 years were recruited...
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PMID: 17217572
PDF is available here.
PDF is available here.
Abstract
Abstract
Some progress has been made identifying genetic and hormonal regulators of calcium absorption. Much progress has been made in understanding the role of diet on influencing calcium retention, especially with regard to dietary protein and salt. Long-held views on dietary factors thought to contribute...
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PMID: 16912552
PDF is available here.
PDF is available here.
Abstract
These results suggest that the first phase of GSIS from MIN6 cells depends on both Ca2+-dependent and -independent mechanisms. The former mechanism includes the extracellular Ca2+ influx via L-type voltage-dependent calcium channel and intracellular Ca2+ release from endoplasmic reticulum via ryanod...
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PMID: 16891769
PDF is available here.
PDF is available here.
Abstract
The differences in calcium absorption are unlikely to have any biological significance. CPPs are unsuitable as candidate ingredients for functional foods that are designed to deliver improved calcium nutrition....
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PMID: 16825691
PDF is available here.
PDF is available here.
European Journal of Oral Sciences (114 Suppl 1)s1 2006
Abstract
We tested the hypothesis that high-calcium medium given prior to or immediately after exposure to fluoride (F) reduces the negative effects of F on secretory amelogenesis. Hamster molar tooth germs were grown in organ culture in media with different calcium levels. Deposition of enamel matrix and ma...
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PMID: 16674672
PDF is available here.
PDF is available here.
Abstract
We compared the effects of 1MeTIQ with 1,2,3,4-tetrahydroisoquinoline (TIQ), a compound sharing many activities with 1MeTIQ (among them reducing free radicals formed during dopamine catabolism), but offering no clear neuroprotection. We found that the compounds similarly inhibit free-radical generat...
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PMID: 16515537
PDF is available here.
PDF is available here.
Abstract
Fractional Ca absorption was significantly higher in RTT than in control girls (mean +/- SDp, 52 vs. 33 +/- 13%). Dietary Ca intake (mean +/- SDp, 1,100 vs. 1,446 +/- 440 g/d) and net Ca absorption (mean +/- SDp, 513 vs. 362 +/- 306 mg/d) did not differ significantly between RTT and controls, respec...
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PMID: 16641581
PDF is available here.
PDF is available here.
Abstract
Calcium-enriched milks are a valuable source of well-absorbed calcium. Absorption of added calcium as TCP was higher than that of calcium from the control milk, but the addition of FOSs or CPPs did not significantly increase calcium absorption. Further research is needed to ascertain the cost-effect...
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PMID: 16469989
PDF is available here.
PDF is available here.
Abstract
Net deficits in bone calcium balance occurred during pregnancy and lactation. Increased dietary calcium intake was associated with improved calcium balance; therefore, greater calcium intakes may minimize bone loss across pregnancy and lactation in women with habitual intakes of <500 mg calcium/d....
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PMID: 16469990
PDF is available here.
PDF is available here.
Marine Biotechnology (8)4 2006
Abstract
We studied the proteinaceous organic matrices of sclerites for both species, to analyze the sequences and the functional properties of the proteins present. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of the preparations showed four bands of proteins with apparent m...
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PMID: 16670968
PDF is available here.
PDF is available here.
Abstract
Le métabolisme du'calcium a étéétudié dans l'organe électrique de la Torpille, au repos et en activité, in vivo et in vitro, en mesurant le calcium total et en utilisant du 45Ca. Lorsque le tissu est mis en présence de fortes concentrations de calcium, un échange complet s'effectue entre le...
PDF is available here.
PDF is available here.
Abstract
We demonstrate the use of time-of-flight secondary ion mass spectrometry (TOF-SIMS) in a forensics application to distinguish Bacillus subtilis spores grown in various media based on the elemental signatures of the spores. Triplicate cultures grown in each of four different media were analyzed to ob...
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PMID: 16269677
PDF is available here.
PDF is available here.
Journal of Nutrition (135)11 2005
Abstract
Corn tortillas are the staple food of Mexico. During their preparation, calcium is added to the tortillas; therefore, tortillas are the main source of calcium for a large proportion of the population. The bioavailability of calcium from lime-treated tortillas in humans is not known. The objectives o...
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PMID: 16251614
PDF is available here.
PDF is available here.
Journal of Nutrition (135)10 2005
Abstract
Our result suggests that calcium absorption is equivalent for CCSM and cow's milk at similar calcium loads....
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PMID: 16177199
PDF is available here.
PDF is available here.
Abstract
Dietary K was highly significantly associated with urinary Ca excretion, with a coefficient of -0.0109 mmol urine Ca/mmol diet K. However, dietary K was negatively correlated with dual-tracer Ca absorption (coefficient for Ca absorption fraction: -0.00094/mmol dietary K), and was not associated with...
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PMID: 15798076
PDF is available here.
PDF is available here.
Abstract
The combination of perfusion chromatography (PC) and inductively coupled plasma mass spectrometry (ICPMS) is a fast, general way to monitor metal incorporation into bacteria. U+ signals from U incorporated intrinsically in Bacillus subtilis (B. subtilis) are measured with 4 ms time resolution to inv...
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PMID: 15732925
PDF is available here.
PDF is available here.
Abstract
We have investigated the role of Ca2+ accumulation and neuronal injury in cerebellar granule neurons after glutamate receptor overactivation. After the removal of the free cytosolic Ca2+ we identified an extensive second Ca2+ fraction (SCF) that is retained within the neurons after glutamate recepto...
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PMID: 15715659
PDF is available here.
PDF is available here.
Abstract
absorption of Ca and Mg was significantly lower in the aged rats (10 and 20 mo) than in the young and adult rat groups. As expected, inulin intake increased Ca and Mg absorption in all four rat groups. However, inulin had a numerically greater effect on Ca absorption in aged rats than in younger rat...
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PMID: 16253138
PDF is available here.
PDF is available here.
Abstract
The natural variation of Mg and Ca stable isotopes of carbonates has been determined in carbonate skeletons of perforate foraminifera and reef coral together with Mg/Ca ratios to assess the influence of biomineralisation processes. The results for coral aragonite suggest its formation, in terms of s...
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PMID: 15351704
PDF is available here.
PDF is available here.
Abstract
At an ingested calcium load of 3.18 mmol, percentage of absorption for water averaged 22.53 +/- 2.53 (mean +/- SD) for men, 22.57 +/- 2.10 (mean +/- SD) for premenopausal women and 21.62 +/- 3.12 (mean +/- SD) for postmenopausal women. Percentage absorption from milk was 23.15 +/- 4.06 (mean +/- SD)...
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PMID: 15365401
PDF is available here.
PDF is available here.
Biochemical Journal (382)Pt 2 2004
Abstract
These results indicate that decreased Ca2+ sensitivity is one of the serious defects in these three excitation-contraction uncoupling CCD mutations. In CCD skeletal muscles, where a mixture of wild-type and mutant RyR1 is expressed, these defects are expected to decrease Ca2+-induced Ca2+ release, a...
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PMID: 15175001
PDF is available here.
PDF is available here.
Abstract
In order to get some insight into the mechanism of the disproportionation of hydrogen peroxide catalyzed by calcium hydroxide, 43Ca NMR spectra of enriched samples of calcium peroxides and of their precursors have been studied in both solution and solid state. This study demonstrates that no well-de...
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PMID: 15028271
PDF is available here.
PDF is available here.
Abstract
Very low calcium intakes are only partially adapted to by increased absorption and decreased excretion. Very low calcium intakes place both white and black pubertal girls at substantial risk for inadequate calcium retention....
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PMID: 15068499
PDF is available here.
PDF is available here.
Abstract
In vitro and in vivo, mouse tissues assayed for 45Ca2+ uptake have shown that ATP increases the Ca2+ take-up in the presence of lactates of iron and aluminum, but this effect is absent with the citrates. The in vitro metal ion exchange with ATP has been demonstrated by electrophoresis and by chromat...
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PMID: 15235153
PDF is available here.
PDF is available here.
Abstract
Calcium absorption in adolescents was significantly higher during the third trimester of pregnancy than in the early postpartum period, and higher calcium intakes during pregnancy appeared to be protective against loss of trabecular bone at the lumbar spine....
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PMID: 14668282
PDF is available here.
PDF is available here.
Clinical Chemistry (49)12 2003
Abstract
We have developed a simple, rapid sample preparation technique for ICP-MS analysis in which 20 micro L of serum can be used for accurate measurement of the calcium isotope distribution in a sample with good precision and a rapid analysis time....
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PMID: 14633877
PDF is available here.
PDF is available here.
Abstract
We show that cyclo DFKRG which was previously selected to increase cell adhesion of human bone marrow stromal cells (HBMSC), increases both cell differentiation and mineralization through activation of tyrosine kinases, focal adhesion kinase (p(125)FAK) and Mitogen Activated Protein (MAP) kinases....
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PMID: 14706549
PDF is available here.
PDF is available here.
Pharmacopsychiatry (36 Suppl 1) 2003
Abstract
We have previously shown that hypoxia and N-methyl-D-aspartate (NMDA) receptor activation induce breakdown of choline-containing phospholipids in rat hippocampus, a process which is mediated by calcium influx and phospholipase A (2) activation. Bilobalide, a constituent of Ginkgo biloba, inhibited t...
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PMID: 13130393
PDF is available here.
PDF is available here.
Abstract
Twenty-seven N,N',N"-trisubstituted thiourea derivatives were prepared. Among them, 1-[3-(4'-hydroxy-3'-methoxy-phenyl)-propyl]-1,3-diphenethyl-thiourea (8l, IC(50)=0.32 microM), showed 2-fold higher antagonistic activity than that of capsazepine (3, IC(50)=0.65 microM) against the vanilloid recepto...
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PMID: 12639539
PDF is available here.
PDF is available here.
Abstract
We report that this cDNA encodes a novel Ca2+-binding protein, named OsSUR1 (for Oryza sativa sugar-up-regulated-1). The recombinant OsSUR1 protein expressed in Escherichia coli had 45Ca2+-binding activity. Northern analysis showed that the OsSUR1 gene was expressed mainly in the internodes of matur...
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PMID: 12728997
PDF is available here.
PDF is available here.
Abstract
Mean (+/- SD) calcium absorption was 75 +/- 9% with the dual-isotope method and was 74 +/- 8% with the whole-body radioisotope retention method. There was a high degree of agreement between the methods. CONCLUSION: The dual-isotope method is a valid approach for measuring calcium absorption from a s...
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PMID: 12540400
PDF is available here.
PDF is available here.
Abstract
scFOSs do not modify intestinal calcium absorption in postmenopausal women who do not receive hormonal replacement therapy. The results from a subgroup of women who had been going through menopause for >6 y (n = 6) suggest that scFOSs may influence calcium absorption in the late postmenopausal phase...
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PMID: 12540407
PDF is available here.
PDF is available here.
Biochimica et Biophysica Acta (1600)1-2 2002
Abstract
I shall summarize the papers in this order of their main interests....
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PMID: 12445452
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.
Food and nutrition bulletin (23)3 Suppl 2002
Abstract
Female adolescent populations with low calcium intakes and sub-optimal vitamin D status are found in northern China. Whether these individuals are able to adapt by enhancing calcium absorption and reducing calcium excretion for maximizing calcium retention is unknown. This study examined the associa...
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PMID: 12362810
PDF is available here.
PDF is available here.
Abstract
Two studies were conducted to measure calcium absorption from calcium sulfate fortified bread and three salts (calcium lactate, calcium carbonate, and calcium sulfate) in healthy premenopausal women using a crossover design. In study I, calcium fractional absorption levels from the three salts label...
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PMID: 12059174
PDF is available here.
PDF is available here.
Abstract
An adequate calcium intake and vitamin-D status is important for bone mineralization in adolescents. In Northern China, calcium intake and plasma vitamin-D level of adolescents is low due to low consumption of dairy foods and inadequate sunshine exposure. True fractional calcium absorption (TFCA) in...
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PMID: 12401923
PDF is available here.
PDF is available here.
Abstract
Abstract
We did a retrospective chart review of 79 patients undergoing thyroid (n = 56) or parathyroid surgery (n = 23) where overall parathyroid function was felt to be at risk. Results/Conclusions A positive slope between the preoperative ciCa and any postoperative ciCa or the first two postoperative ciCa'...
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PMID: 11774404
PDF is available here.
PDF is available here.
Biological Research (35)2 2002
Abstract
Potassium depolarization of cultured muscle cells was employed to study cellular responses linked to calcium signaling. Events occurring after depolarization include i) A transient increase of the IP3 mass (2-10s); ii) A slow calcium transient (5 to 25s) that propagates as a low concentration wave a...
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PMID: 12415736
PDF is available here.
PDF is available here.
Analytical Biochemistry (299)2 2001
Abstract
Environmental Research (87)3 2001
Abstract
The development of the enamel biomarker for heavy metal exposure assessment is designed to improve studies of dose-effect relationships to embryonic anomalies, particularly neurotoxic dysfunction. This report documents initial demonstrations of ambient lead (Pb) relative to calcium (Ca) in histologi...
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PMID: 11771927
PDF is available here.
PDF is available here.
Abstract
Fortified Horlicks is a highly bioavailable source of calcium. A single serving, containing at least 500 mg calcium, provides half the reference nutrient intake for the population sub-group with the highest requirement (adolescent boys) and more than half for all others. SPONSORSHIP: SmithKline Beec...
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PMID: 11528493
PDF is available here.
PDF is available here.
Abstract
The present study was performed to investigate calcium-binding characteristics of different brans under simulated gastrointestinal pH conditions and to explore the significance of dietary fiber, oxalate, and phytate for calcium binding. Different brans (rice, rye, soy, fine wheat, coarse wheat, and...
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PMID: 11559145
PDF is available here.
PDF is available here.
Abstract
Ca nutritional requirements and bone Ca turnover can be assessed using numerous techniques. Among these techniques are bone mass measurements, tracer kinetic studies, bone histomorphometry and biochemical studies. Stable-isotope-based kinetic studies offer unique advantages in their ability to asses...
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PMID: 11681644
PDF is available here.
PDF is available here.
Abstract
The details of calcium flux during growth were examined in female rats. Twenty-eight 53-d-old rats were equally divided into 4 groups. Rats were given a purified diet (0.5% Ca and 0.35% Pi) throughout the experiment. Calcium balance and 45Ca kinetics studies using an open two-compartment model were...
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PMID: 11349891
PDF is available here.
PDF is available here.