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Long-term effect of gluten restriction on bone mineral density of patients with coeliac disease (1997)

BAI, J. C. ; GONZALEZ, D. ; MAUTALEN, C. ; [et al.]

Oxford BSL : Blackwell Science

Alimentary pharmacology & therapeutics 11 (1997), S. 0

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ISSN: 1365-2036

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: Aim: To assess the long-term effect of a gluten-free diet on bone mineral density of adults with untreated coeliac disease. Methods: Bone mineral density was assessed at baseline and after a mean duration of 37 months of treatment in 25 unselected newly diagnosed coeliac patients. Results: At baseline, osteopenia (〉−1 s.d. below normal) was evident in the lumbar spine and total skeleton in 18 (72%) and 21 (84%) patients, respectively. At the end of the study, bone density had increased (mean bone mass Z-score increase: Z-score +1.0 for the lumbar spine and +1.1 for total skeleton) in 22 and 23 patients, respectively. Patients who adhered to strict gluten restriction (n=15) demonstrated a similar bone remineralization in the spine than those patients with partial compliance (n=10) (mean Z-score increase: +1.0, in both areas). A greater mean annual change in Z-score in the total skeleton was noted in patients who followed strict gluten restriction (0.4±0.1) respect to those with partial compliance (0.3±0.1); however, this difference was not statistically significant. Pre-menopausal women had significantly greater remineralization that post-menopausals (P〉0.05). Remineralization showed an inverse correlation with the degree of basal osteopenia (r=−0.525; P〈0.002). Conclusions: Long-term treatment with gluten-free diet produces a significant improvement in bone density in coeliac patients. Remineralization was more pronounced in patients who better comply with gluten-free diet, in pre-menopausal women and in patients with the lowest baseline bone mineral density.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-2036.1997.112283000.x

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A theoretical and experimental approach to the active-to-passive transition in the oxidation of silicon carbide: Experiments at high temperatures and low total pressures (1998)

Schneider, B ; Guette, A ; Naslain, R ; [et al.]

Springer

Journal of materials science 33 (1998), S. 535-547

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ISSN: 1573-4803

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract Active-to-passive oxidation transition in chemical vapour deposited β-SiC was investigated in the temperature range 1300≤T≤1700°C under low total pressures (100≤Ptot≤800 Pa) and relatively high linear gas flow rates (10≤Vgas≤60 m s1) by thermogravimetric analysis. For given T, Ptot and Vgas, the oxygen partial pressure at the transition, PtO2, corresponds to the value where the mass-loss rate per unit area of the oxidized sample, R, is maximum. Logarithms of PtO2 are linear functions of reciprocal temperature for given Ptot, and Vgas. Vgas has a significant influence on the position of the transition log(PtO2)–T-1 line. PtO2 is also slightly affected by an increase of Ptot from 100 Pa to 800 Pa. In passive oxidation at high temperatures (〉1500°C), large bubbles form in the silica film which is then disrupted leading to a loss of material. In active oxidation, R significantly depends on Vgas: the kinetics is diffusion or mass transfer controlled under the conditions investigated in the present study. In both active and passive oxidation regimes, a mass loss of the test specimen is always observed; an explanation is proposed.