The crystal structure of end-member sogdianite from the Dara-i-Pioz alkaline massif, northern Tajikistan, a 10.1240(3), c 14.3198(5) Å, V 1271.1(1) Å3, space group P6/mcc, Z = 2, has been refined to an R index of 2.0% using 576 observed (|Fo | > 4sF) reflections collected with single-crystal diffractometer with MoKa X-radiation. Electron-microprobe analysis gives a composition (Zr1.98 Hf002)S2....

At least two clinical rules for predicting shortand long-term mortality in patients with community-acquired pneumonia (CAP) have been successfully validated: the Pneumonia Severity Index (PSI), and the CURB-65 score (confusion, urea .7 mmol?L, respiratory frequency o30 breaths?min, systolic blood pressure ,90 mmHg or diastolic blood pressure f60 mmHg and age o65 yrs) and its modifications. The ...

OBJECTIVE To study the effects of short-term exposure to high oxygen concentrations (hyperoxia) on Wistar rat lungs. METHODS Animals were divided into three groups exposed to hyperoxia for 10', 30' and 90' (O10', O30', O90', respectively), together with a control group (exposed to room air). The animals were sacrificed 24 h after exposure. Bronchoalveolar lavage was performed, and the lungs w...

Escherichia coli O157, Salmonella enterica O30, and Citrobacter freundii F90 have identical O-antigen structures, as do E. coli O55 and S. enterica O50. The O-antigen gene cluster sequences for E. coli O157 and E. coli O55 have been published, and the genes necessary for O-antigen biosynthesis have been identified, although transferase genes for glycosidic linkages are only generic and have not...

The existence of N-formylated sugars in the O-antigens of Gram-negative bacteria has been known since the middle 1980s, but only recently have the biosynthetic pathways for their production been reported. In these pathways, glucose-1-phosphate is first activated by attachment to a dTMP moiety. This step is followed by a dehydration reaction and an amination. The last step in these pathways is c...