University of Houston

About: University of Houston is a education organization based out in Houston, Texas, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 23074 authors who have published 53903 publications receiving 1641968 citations.

Predictors of pulmonary zygomycosis versus invasive pulmonary aspergillosis in patients with cancer.

Abstract: BACKGROUND: Pulmonary zygomycosis (PZ), an emerging mycosis among patients with cancer, has a clinical manifestation similar to that of invasive pulmonary aspergillosis (IPA). Most cases of PZ in such patients develop as breakthrough infections if treatment with antifungal agents effective against Aspergillus species is administered. However, clinical criteria to differentiate PZ from IPA are lacking. METHODS: We retrospectively reviewed the clinical characteristics and computed tomography (CT) findings for 16 patients with cancer and PZ and for 29 contemporaneous patients with cancer and IPA at the time of infection onset (2002-2004). Patients with mixed infections were excluded. Parameters predictive of PZ by univariate analysis were included in a logistic regression model. RESULTS: Almost all patients with PZ (15 of 16) and IPA (28 of 29) had underlying hematological malignancies and typical risk factors for invasive mold infections. In logistic regression analysis of clinical characteristics, concomitant sinusitis (odds ratio [OR], 25.7; 95% confidence interval [CI], 1.47-448.15; P =.026) and voriconazole prophylaxis (OR, 7.76; 95% CI, 1.32-45.53; P =.023) were significantly associated with PZ. The presence of multiple (> or = 10) nodules (OR, 19.8; 95% CI, 1.94-202.29; P =.012) and pleural effusion (OR, 5.07; 95% CI, 1.06-24.23; P =.042) at the time that the patient underwent the initial CT were both independent predictors of PZ in the logistic regression analysis of radiological parameters. No difference occurred in the frequency of other CT findings suggestive of pulmonary mold infections (e.g., masses, cavities, halo sign, or air-crescent sign) between the 2 patient groups. CONCLUSIONS: PZ in immunocompromised patients with cancer could potentially be distinguished from IPA on the basis of clinical and radiological parameters; prospective validation is needed.

High-pressure study of the new Yb-Ba-Cu-O superconducting compound system.

Abstract: The pressure effect on the superconducting state above 77 K in the new Y-Ba-Cu-O compound system has been determined In strong contrast to what is observed in the La-Ba-Cu-O and La-Sr-Cu-O systems, pressure has only a slight effect on the superconducting transition temperature

Unusual high thermal conductivity in boron arsenide bulk crystals

Abstract: Conventional theory predicts that ultrahigh lattice thermal conductivity can only occur in crystals composed of strongly bonded light elements, and that it is limited by anharmonic three-phonon processes. We report experimental evidence that departs from these long-held criteria. We measured a local room-temperature thermal conductivity exceeding 1000 watts per meter-kelvin and an average bulk value reaching 900 watts per meter-kelvin in bulk boron arsenide (BAs) crystals, where boron and arsenic are light and heavy elements, respectively. The high values are consistent with a proposal for phonon-band engineering and can only be explained by higher-order phonon processes. These findings yield insight into the physics of heat conduction in solids and show BAs to be the only known semiconductor with ultrahigh thermal conductivity.

Democratic Values and the Transformation of the Soviet Union

Abstract: Our purpose in this article is to determine the degree to which the cultural requisites to democracy are present in the contemporary political culture of the USSR. We focus on support for core democratic rights, liberties, and institutions. Data for this project come from a survey of 504 citizens of the Moscow Oblast conducted between February 17, 1990, and March 4, 1990. In absolute terms, support for democratic values is fairly widespread in the Moscow Oblast. We found significant levels of endorsement of competitive elections and for many democratic rights and liberties such as liberty and the norms of democracy. Many of the scales measuring support for democratic rights were intercorrelated, leading us to hypothesize the existence of a general underlying dimension of democratic values. The best predictors of attitudes toward general democratic values were education, gender, and age. The better educated, males, and the young tended to be more supportive of democratic institutions and processes. We take...

Analysis of change: modeling individual growth.

Abstract: Research on change is complicated by problems of measurement and analysis stemming from a conceptualization of change as a series of accumulating increments and decrements. In contrast, individual growth curves depict change as a continuous process underlying individual performance. These two perspectives are reviewed, and some problems with the use of difference scores in the study of change are clarified. Traditional methods are contrasted with growth curve analysis for the purposes of measuring change and studying its correlates. An illustrative example of the use of growth curves is provided from research on recovery of cognitive function following pediatric closed head injury.