56,333 research outputs found
Vanadia Promoted Co-AI20 3 Fischer-Tropsch Catalysts
No full textBibliography: leaves 117-124.The primary aim of this work was to study systematically V20 5 promotion on yAI203 supported cobalt-based Fischer-Tropsch catalysts. The y-Ah03 support was modified by addition of varying amounts of vanadia and was subsequently loaded with the same Co content (10 wt-%). The modified supports and catalysts were characterised using conventional characterisation methods. The physio-chemical properties of the vanadia promoted supports and catalysts were characterised using Atomic Adsorption Spectroscopy (AAS), zeta-potential measurements, and BET measurements, X-ray Diffraction (XRD), Temperature Programmed Reduction (TPR), Transmission Electron Microscopy (TEM), and CO chemisorption. Catalyst performance in the Fischer-Tropsch synthesis was tested in fixed bed reactor. A catalysts synthesised from plain y-A1203 was used as a base catalyst. Characterization results show that modification of y-Ab03 support to obtain V205 loadings beyond 1-monolayer vanadia coverage was difficult when using ion exchange. Ion-exchange equilibrium limitations might have caused the poor vanadia loadings beyond 1-monolayer coverage. The supports net surface charge as measured using zeta potential, was decreased by vanadia content in the supports. CO chemisorption results were complex and could only be modelled using dual site Langmuir model assuming the presence of two different sites absorbing CO on the Co-V-AI catalyst system. This made extraction of physical properties from this method rather difficult. Fischer Tropsch synthesis reaction was carried out at typical industrial conditions (T=220°C, P=20 bar (a), H2/CO=2 Xco-60 mol-%) for cobalt catalysts. Vanadia promoted catalysts showed a marked decrease in initial activity. However, the overall deactivation rate was lower with increasing vanadia content. The vanadia content did not affect the chain growth kinetic behavior of the catalyst in the Fischer-Tropsch synthesis hence C5+ selectivity in the Fischer-Tropsch synthesis was unperturbed by vanadia content. Increasing the vanadia content in the catalyst resulted in high n-olefin content and high 1-olefin content. The observed increase in olefin content might be due to the low catalytic activity observed for the catalysts with high vanadia loadings. The most pronounced effect of vanadia promotion on Fischer Tropsch synthesis was in the oxygenate content in the Fischer-Tropsch product. Catalysts with high vanadia loading yielded high amounts of oxygenate products; mainly alcohols and aldehydes
Annie Fischer
No full textFischer Annie zongorázik:1.d-moll zongoraverseny : K.466 = Piano concerto No.20 in d minor /W. A. Mozart ; kadenciák J. N. Hummel (I, III) +2.C-dúr zongoraverseny : K.467 = Piano concerto No.21 in C major /W. A. Mozart ; kadenciák F. Busoni (I, III) +3.D-dúr hangversenyrondó : K.382 = Rondo in D major /W. A. Mozar
Opius (Agnopius) tirolensis Fischer 1958
No full text* Opius (Agnopius) tirolensis Fischer, 1958 Opius tirolensis Fischer, 1958 d: 241 –260. Opius (Misophthora) tirolensis Fischer, 1972: 1 –620. Opius (Allotypus) tirolensis Tobias, 1986: 60. Opius (Agnopius) tirolensis Fischer, 1982: 21 –37. Distribution in Turkey. Zonguldak (Fischer & Beyarslan, 2005 a); Tokat (Beyarslan & Fischer, 2011). Distribution. Western Palaearctic. Austria, Czechoslovakia, Denmark, Finland, Germany, Hungary, Italy, Poland, Romania, Russia, Turkey. Host. Diptera. Agromyzidae: Phytomyza flavicornis Fallen, 1823 [Urtica dioica].Published as part of Beyarslan, Ahmet & Fischer, Maximilian, 2013, Checklist of Turkish Opiinae (Hymenoptera, Braconidae), pp. 401-454 in Zootaxa 3721 (5) on page 414, DOI: 10.11646/zootaxa.3721.5.1, http://zenodo.org/record/22201
Analysis of Immunomodulatory Effects of Vitamin D in Epithelial-Mesenchymal Transition and Airway Remodeling in Allergic Airway Inflammation.
No full textThe first line of defense from environmental factors in the host is the epithelium. In the lung, the epithelial layer provides not only a passive physical barrier, but also acts as an active protector through the release of antimicrobial agents, cytokines, and other factors which can activate the innate and adaptive immune system. Patients that suffer from asthma, a chronic inflammatory disease of the airways, show pathological changes in the airways, including airway remodeling, basement membrane thickening, and epithelial damage with large immune cell infiltrate. How the epithelium contributes to airway remodeling and subepithelial fibrosis is unknown. However, it has been proposed that in inflammatory conditions, epithelial cells can undergo modifications that contribute to the pathophysiology of asthma. Epithelial-mesenchymal transition (EMT) is a process by which epithelial cells transition into a myofibroblast cell with enhanced migratory ability to secrete connective tissue.
Vitamin D has been shown to have immunomodulatory properties in both innate and adaptive immunity. The relationship between asthma and vitamin D deficiency has been linked with increased asthma pathogenesis. The active form of vitamin D, calcitriol, exerts its actions through the vitamin D receptor (VDR) inducing a number of biological processes.
To better understand the mechanisms underlying EMT and the nature of vitamin D modulation in the airway epithelium, human bronchial epithelial cells were stimulated with both calcitriol and transforming growth factor (TGF)-β1 or TGF-β2. These cells were analyzed for their expression of EMT markers and their functional invasive and migratory properties. Both TGF-β1 and TGF-β2 increased the expression of EMT markers, Snail, N-cadherin, and vimentin, and decreased the expression of E-cadherin. Calcitriol inhibited the effect of both TGF-β1 and TGF-β2 on the expression of EMT markers. Calcitriol also prevented the migratory and invasive actions of the cells following exposure to TGF-β1 and TGF-β2. In order to examine the in vivo significance of these findings, an allergic airway inflammatory mouse model of asthma was utilized to examine the expression of the EMT markers. Mice were sensitized and challenged with a combination of clinically relevant allergens house dust mite, ragweed, and Alternaria alternata (HRA), and fed a special vitamin D-sufficient or vitamin D-supplemented diet. HRA-vitamin D-supplemented mice had increased pulmonary function, as measured by airway hyperresponsiveness, increased cellular infiltrate in their bronchoalveolar lavage fluid, decreased vimentin and N-cadherin with increased expression in E-cadherin in the epithelium compared to HRA mice on a vitamin D-sufficient diet. Finally, vitamin D-deficient HRA mice were analyzed for the effect of vitamin D on airway hyperresponsiveness, airway remodeling, and markers associated with the regulation of vitamin D and EMT. Vitamin D-deficient HRA mice had decreased pulmonary function, increased eosinophils and lymphocytes in the bronchoalveolar lavage fluid, decreased VDR expression, and increased phosphorylated glycogen synthase kinase (GSK)-3β. The effect of vitamin D on VDR and pGSK-3β was also analyzed in human bronchial epithelial cells treated with TGF-β1 or TGF-β2. Inflammatory conditions used to mimic EMT resulted in the decreased expression of VDR along with increased pGSK-3β.
The findings of this study suggest that epithelial changes in the airway may be mediated through EMT mechanisms and could be modulated by vitamin D. Therefore, vitamin D may provide a therapeutic role in attenuating allergic airway inflammation.ProQuest Traditional Publishing Optionxvii, 127 page
Opius (Opius) paraplasticus FISCHER 1972
No full textOpius (Opius) paraplasticus FISCHER 1972 M a t e r i a l: Semnan province: Damghan, 1, 1, November 2003. D i s t r i b u t i o n o u t s i d e I r a n: Central Palaearctic, Afrotropical (South Africa).Published as part of Ghahari, H., Fischer, M., K. J, O. C & Beyarslan, A., 2010, Some New records of Braconidae (Hymenoptera) for Iran, pp. 1395-1404 in Linzer biologische Beiträge 42 (2) on page 1400, DOI: 10.5281/zenodo.532390
Opius (Opiothorax) nigricoloratus FISCHER 1958
No full textOpius (Opiothorax) nigricoloratus FISCHER 1958 M a t e r i a l: Semnan province: Shahrood, 1, 1, November 2003. D i s t r i b u t i o n o u t s i d e I r a n: Palaearctic (Austria, Denmark, Finland, Germany, Greece, Hungary, Italy, Mongolia, Spain, Switzerland).Published as part of Ghahari, H., Fischer, M., K. J, O. C & Beyarslan, A., 2010, Some New records of Braconidae (Hymenoptera) for Iran, pp. 1395-1404 in Linzer biologische Beiträge 42 (2) on page 1400, DOI: 10.5281/zenodo.532390
Phaenocarpa fidelis FISCHER 1970
No full textPhaenocarpa fidelis FISCHER 1970 D i a g n o s i s Length: 2.0 mm. Head not widened behind eyes; mandibles without differentiated cleft between teeth 1 and 2. Notauli not reaching posterior fovea; lateral fields of scutellar sulcus as long as wide. R almost reaching apex of wing; d slightly shorter than nr. T1 twice as long as posterior width, its sides almost parallel; Ovipositor sheaths as long as posterior tibia. G e o g r a p h i c d i s t r i b u t i o n a n d m a t e r i a l s t u d i e d Austria, Georgia, Hungary, Japan, Kazakhstan, Moldova, Russia, Switzerland, Spain (Burgos: Bugedo (UTM: 30 T 50472), 10.VIII.1985, 1).Published as part of Fischer, M., Tormos, J., Pardo, X. & J. D, 2008, New citations of Alysiini from Spain, with a description of Dinotrema mediocornis hispanicum nov. ssp. and of the females of Aspilota inflatinervis and Synaldis azorica (Hymenoptera, Braconidae, Alysiinae), pp. 1449-1466 in Linzer biologische Beiträge 40 (2) on page 1460, DOI: 10.5281/zenodo.543150
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