This paper deals with skew ruled surfaces Φ in the Euclidean space E 3 which are right normalized, that is they are equipped with relative normalizations, whose support function is of the form q, where w 2 (u, v) is the discriminant of the first fundamental form of Φ. This class of relatively normalized ruled surfaces contains surfaces such that their relative image Φ * is either a curve or it is as well as Φ a ruled surface whose generators are, additionally, parallel to those of Φ. Moreover we investigate various properties concerning the Tchebychev vector field and the support vector field of such ruled surfaces.
This paper deals with skew ruled surfaces in the Euclidean space E 3 which are equipped with polar normalizations, that is, relative normalizations such that the relative normal at each point of the ruled surface lies on the corresponding polar plane. We determine the invariants of a such normalized ruled surface and we study some properties of the Tchebychev vector field and the support vector field of a polar normalization. Furthermore, we study a special polar normalization, the relative image of which degenerates into a curve.
Objective: To identify predictors of early readmission in children with asthma. Design/Methods: A case-control study of a cohort of children hospitalized for asthma. Cases were children with asthma readmitted with the same diagnosis within 30 days of the index admission. For each case, we identified up to two controls which were children hospitalized for asthma but not readmitted within 30 days.Cases and controls were matched for age, gender, ethnicity, season and year of index admission. Data were abstracted from the medical records. Bivariate analyses (clogit, GEE statistics) were performed. Conditional logistic regression analysis determined the relative contribution of independent variables.Results: 458 subjects were analyzed (161 cases, 297 matched controls). Cases and controls were successfully matched (mean age for cases 6.4 years (SD 5.3) vs 6.4 years (SD 5.1) for controls; for both groups 64% were male, 61% Hispanic and 36% African American). Cases had a greater mean number of lifetime admissions for asthma (8.2 vs 3.3, pϽ.0001), were more likely to have received a pulmonary consultation prior to the index admission (OR 2.49, 95% CI 1. 45-4.29) and to have a history of asthma ICU admission (OR 2.20, 95% CI 1.31-3.70). Using conditional logistic regression, history of multiple lifetime admissions was found to be an independent predictor of readmission. Exposure to environmental triggers was not associated with readmission. No significant difference was found between the groups on mean oxygen saturation at index admission or discharge, need for oxygen supplementation during the index admission, and presence of wheezing at discharge.Conclusions: Our findings suggest that early readmission occurs among a subset of children with greater disease severity. History of multiple admissions, receipt of pulmonary consultation and prior ICU admission may identify children who are more likely to be readmitted and thus, guide inpatient and outpatient asthma management. PRENATAL EXPOSURE TO DEXAMETHASONE PERMANENTLY ALTERS THE EXPRESSION OF 11BETA HSD1, MINERALCORTICOID AND 5HT1B RECEPTOR IN RAT HIPPOCAMPUSKC PAGE 1 1 BUCKNELL UNIVERSITY (USA) Changes in gene expression in the brain, pituitary, and adrenal have been reported in a number of prenatal stress studies. However, it is not clear whether the high maternal glucocorticoid (GC) level is directly responsible for these perturbations. We exposed rat dams to DEX during gestation days 14 -19 and found a significant decrease in birth weight and adult weight of the male offspring. In addition, this treatment elicited a significant increase in serum ACTH and CORT. In contrast, circulating levels of serotonin were significantly lower in the DEX-exposed adult males. Using real time RT-PCR we measured a significant decrease in the hippocampal mineralcorticoid receptor (MR) and serotonin receptor, 5-HT1B. In contrast, the mRNA levels measured for hippocampal 5-HT1A, 5-HT2A, and glucocorticoid receptor (GR) were not significantly different from the control animals. Interesti...
We consider hypersurfaces in the real Euclidean space R n+1 (n ≥ 2) which are relatively normalized. We give necessary and sufficient conditions a) for a surface of negative Gaussian curvature in R 3 to be ruled, b) for a hypersurface of positive Gaussian curvature in R n+1 to be a hyperquadric and c) for a relative normalization to be constantly proportional to the equiaffine normalization.
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