Perovskite-type B-site Bi-doped ceramic membranes for oxygen separation

Novel mixed conducting oxides, B-site Bi-doped perovskites were exploited and synthesized. Cubic perovskite structures were formed for BaBi0.2COyFe0.8-yO3-delta (y less than or equal to 0.4) and BaBixCo0.2Fe0.8-xP3-delta (x=0.1-0.5) The materials exhibited considerable high oxygen permeability at high temperature. The oxygen permeation flux of BaBi0.2Co0.35Fe0.45O3-delta membrane reached about 0.77 x 10(-6) mol/cm(2) s under an air/helium oxygen partial pressure gradient at 900 degrees C, which was much higher than that of other bismuth-contained mixed conducting membranes. The permeation fluxes of the materials increased with the increase of cobalt content, but no apparent simple relationship was found with the bismuth content. The materials also demonstrated excellent reversibility of oxygen adsorption and desorption. Stable time-related oxygen permeation fluxes were found for BaBi0.2CO0.35Fe0.45O3-delta and BaBi0.3Co0.2Fe0.5O3-delta a membranes at 875 degrees C.

Híbrido duplo BRS 2223: nova opção de milho de ciclo superprecoce para áreas de clima tropical.

2003

Klaster Bibliotek Bi@lskich próbą poszukiwania płaszczyzn synergii lokalnych bibliotek

W części wprowadzającej artykułu pokrótce przedstawiono koncepcję i typologię klastrów, a także cechy wspólne i różnice między klastrami a organizacjami sieciowymi. Prezentowane w drugiej części artykułu zagadnienia dotyczą szeroko rozumianego zarządzania: strategii powstawania klastra, barier rozwoju, czynników decydujących o powodzeniu projektu i korzyści wynikających z jego funkcjonowania w otoczeniu lokalnym. W części końcowej zaprezentowano przykłady współdziałania uczestników klastra wyzwalające efekt synergii.

Impact of gene variants on sex-specific regulation of human Scavenger receptor class B type 1 (SR-BI) expression in liver and association with lipid levels in a population-based study.

BACKGROUND: Several studies have noted that genetic variants of SCARB1, a lipoprotein receptor involved in reverse cholesterol transport, are associated with serum lipid levels in a sex-dependent fashion. However, the mechanism underlying this gene by sex interaction has not been explored. METHODS: We utilized both epidemiological and molecular methods to study how estrogen and gene variants interact to influence SCARB1 expression and lipid levels. Interaction between 35 SCARB1 haplotype-tagged polymorphisms and endogenous estradiol levels was assessed in 498 postmenopausal Caucasian women from the population-based Rancho Bernardo Study. We further examined associated variants with overall and SCARB1 splice variant (SR-BI and SR-BII) expression in 91 human liver tissues using quantitative real-time PCR. RESULTS: Several variants on a haplotype block spanning intron 11 to intron 12 of SCARB1 showed significant gene by estradiol interaction affecting serum lipid levels, the strongest for rs838895 with HDL-cholesterol (p=9.2x10(-4)) and triglycerides (p=1.3x10(-3)) and the triglyceride:HDL cholesterol ratio (p=2.7x10(-4)). These same variants were associated with expression of the SR-BI isoform in a sex-specific fashion, with the strongest association found among liver tissue from 52 young women<45 years old (p=0.002). CONCLUSIONS: Estrogen and SCARB1 genotype may act synergistically to regulate expression of SCARB1 isoforms and impact serum levels of HDL cholesterol and triglycerides. This work highlights the importance of considering sex-dependent effects of gene variants on serum lipid levels.

6. Consideraciones nomenclaturales y sistemáticas en el orden "Ammophiletalia" Br.-BI. 1933

La primera propuesta de sistematización fitosociológica, a nivel de alianza, de las comunidades vegetales de las dunas litorales de las costas europeas, fue la de Braun-Blanquet (Jahrb. St. Gallischen Naturwiss. Ges. 57(2): 346. 1921); allí se describe la alianza Ammophilion para incluir dos asociaciones: “Ammophila-Medicago mnarina-Assoziation” y “Crucianelletum”. La primera es el holotipo de la alianza (CEN, Art. 18), puesto que la segunda no fue válidamente publicada (CPN, Art. 7). Posteriormente el mismo autor (Braun-Blanquet, Prodr. Groupements Vég. 1: 5. 1933) describe el orden Ammophiletalia para incluir las alianzas Ammophilion (holotipo del orden) y Ononidion angustissimae all. prov.

Nonlinear dynamics and solitons in Debye bi-crystals

The nonlinear dynamics of longitudinal dust lattice waves propagating in a dusty plasma bi-crystal is investigated. A “diatomic”-like one-dimensional dust lattice configuration is considered, consisting of two distinct dust grain species with different charges and masses. Two different frequency dispersion modes are obtained in the linear limit, namely, an optical and an acoustic wave dispersion branch. Nonlinear solitary wave solutions are shown to exist in both branches, by considering the continuum limit for lattice excitations in different nonlinear potential regimes. For this purpose, a generalized Boussinesq and an extended Korteweg de Vries equation is derived, for the acoustic mode excitations, and their exact soliton solutions are provided and compared. For the optic mode, a nonlinear Schrödinger-type equation is obtained, which is shown to possess bright- (dark-) type envelope soliton solutions in the long (short, respectively) wavelength range. Optic-type longitudinal wavepackets are shown to be generally unstable in the continuum limit, though this is shown not to be the rule in the general (discrete) case.