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Techniques for neutron diffraction on solidified gases to 10 GPa and above: Applications to ND3 phase IV (1995)

Klotz, S. ; Gauthier, M. ; Besson, J. M. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 67 (1995), S. 1188-1190

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Neutron powder diffraction can provide important structural information on hydrogenous compounds which are gases at ambient temperature. For high pressure studies, however, this technique has been seriously limited by the fact that it was impossible (a) to load such gases in large volume devices and (b) to compress them to elevated pressures above some 1 GPa. In this letter we show that, using a previously described pressure cell, a wide range of gaseous samples may be loaded and compressed to ∼10 GPa with standard tungsten carbide anvils. We illustrate the effectiveness of the technique with neutron powder diffraction data recently collected on deuterated ammonia ND3 phase IV, where accurate structural data were obtained after a few hours collection time. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.115002

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Acquired carnitine abnormalities in critically ill children (1997)

Proulx, F. ; Lacroix, J. ; Qureshi, I. A. ; [et al.]

Springer

European journal of pediatrics 156 (1997), S. 864-869

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ISSN: 1432-1076

Keywords: Key words Carnitine ; Child ; Head injury ; Heart defects ; Sepsis

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract In order to characterize the role of carnitine during metabolic stress, we prospectively determined carnitine profiles in plasma and urine on admission, days 2, 5, 10 and 15, among 28 critically ill children free of any known conditions associated with secondary carnitine deficiency. More than 25% of plasma and 50% of urinary carnitine measurements were abnormal; 96% (27/28) of patients displayed on at least one occasion an abnormal [〈−2 SD or 〉+2 SD] carnitine value in plasma. Three children had extremely low [〈10 μmol/l] free carnitine (FC) levels in plasma. Plasma esterified and FC levels on admission were not related to the risk of mortality [PRISM score], to muscle lysis [CK values], and to the caloric intake. Levels of FC and esterified carnitine in plasma were unrelated to those measured in urine. Conclusion Abnormal plasma and urine carnitine measurements are frequently found in critically ill children; the biological significance of these perturbations remains unclear. Caution must be exercised before concluding that an abnormal carnitine value is indicative of an underlying hereditary metabolic disorder in this population.