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Search Results: 1 - 10 of 223867 matches for " R. Schinke "
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Isotope effects in N2O photolysis from first principles
J. A. Schmidt, M. S. Johnson,R. Schinke
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2011,
Abstract: For the first time, accurate first principles potential energy surfaces allow N2O cross sections and isotopic fractionation spectra to be derived that are in agreement with all available experimental data, extending our knowledge to a much broader range of conditions. Absorption spectra of rare N- and O-isotopologues (15N14N16O, 14N15N16O, 15N216O, 14N217O and 14N218O) calculated using wavepacket propagation are compared to the most abundant isotopologue (14N216O). The fractionation constants as a function of wavelength and temperature are in excellent agreement with experimental data. The study shows that excitations from the 3rd excited bending state, (0,3,0), and the first combination state, (1,1,0), are important for explaining the isotope effect at wavelengths longer than 210 nm. Only a small amount of the mass independent oxygen isotope anomaly observed in atmospheric N2O samples can be explained as arising from photolysis.
阮红,R. Gerstmeir,S. Schinke,B. J. Eikmanns
中国科学 生命科学 , 2004,
Abstract: 谷氨酸棒杆菌Corynebacteriumglutamicum可以利用乙酸为碳源和能源进行生长.乙酸代谢中涉及乙酸活化的两个酶为磷酸转乙酰酶PTA和乙酸激酶AK,它们是由pta-ack操纵子经诱导表达产生的.采用转座子挽救法,我们从调控突变株C.glutamicumG25中获得了amrG1和amrG2两个目标基因.经分析鉴定,amrG1基因(NCBIGenBank接受号为AF532964)可能参与乙酸代谢调控,编码作用于pta-ack操纵子的一个调控因子.该调控因子基因序列全长732bp,开放阅读框含有243个氨基酸,分子量约为27kD.通过基因定点缺失和过量表达技术,在谷氨酸棒杆菌野生型菌株中分别构建了amrG1基因缺失菌株和表达菌株,并研究了它们在含有葡萄糖和/或乙酸不同碳源的基本培养基上生长时产生的PTA和AK酶活性特征.酶活性测定结果发现其中的amrG1基因缺失菌株和表达菌株存在着与野生型菌株不同的一系列酶学特征,分析显示:以野生型菌株为对照,amrG1基因缺失菌株在含有葡萄糖碳源的培养基上生长时表现出较高的PTA和AK酶活性,并且在葡萄糖和乙酸两种碳源上生长时表现出与乙酸碳源上生长时几乎同样的PTA和AK酶活性;amrG1基因过量表达对葡萄糖碳源上生长产生的PTA和AK酶活性有一定程度的抑制,即表现出与基因缺失情况相反的调控效应.根据以上结果分析,amrG1可能编码了作
Damage estimation of subterranean building constructions due to groundwater inundation – the GIS-based model approach GRUWAD
R. Schinke,M. Neubert,J. Hennersdorf,U. Stodolny
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2012, DOI: 10.5194/nhess-12-2865-2012
Abstract: The analysis and management of flood risk commonly focuses on surface water floods, because these types are often associated with high economic losses due to damage to buildings and settlements. The rising groundwater as a secondary effect of these floods induces additional damage, particularly in the basements of buildings. Mostly, these losses remain underestimated, because they are difficult to assess, especially for the entire building stock of flood-prone urban areas. For this purpose an appropriate methodology has been developed and lead to a groundwater damage simulation model named GRUWAD. The overall methodology combines various engineering and geoinformatic methods to calculate major damage processes by high groundwater levels. It considers a classification of buildings by building types, synthetic depth-damage functions for groundwater inundation as well as the results of a groundwater-flow model. The modular structure of this procedure can be adapted in the level of detail. Hence, the model allows damage calculations from the local to the regional scale. Among others it can be used to prepare risk maps, for ex-ante analysis of future risks, and to simulate the effects of mitigation measures. Therefore, the model is a multifarious tool for determining urban resilience with respect to high groundwater levels.
Hope E. Yungblut,Robert J. Schinke,Kerry R. McGannon
Journal of Sports Science and Medicine , 2012,
Abstract: Early adolescence is a time when a transition away from sport and physical activity participation is at its highest level among female youth (Hedstrom & Gould, 2004). This has led to the identification of barriers and facilitators of physical activity participation for adolescent females. Consequently there have been calls to overcome barriers and augment facilitators via the creation of gender-relevant programming. Despite these calls and efforts, a gender disparity remains, and a detailed understanding of how girls experience and interpret physical activity within the context of their lives is still lacking. The current project aimed to gain further insight into the foregoing using tenets of Interpretive Phenomenology to further understand the lived physical activity experiences of females during early adolescence, delineating their barriers to participation and the factors enabling participation. Five themes were identified and made into vignettes to facilitate understanding from adolescent females' perspectives: friends or don't know anyone, good or not good enough, fun or not fun; good feeling or gross; and peer support or peer pressure. The physical activity promotion implications for female youth are discussed within the context of these themes.
中国科学 生命科学 , 2004,
Abstract: 谷氨酸棒杆菌Corynebacteriumglutamicum可以利用乙酸为碳源和能源进行生长.乙酸代谢中涉及乙酸活化的两个酶为磷酸转乙酰酶PTA和乙酸激酶AK,它们是由pta-ack操纵子经诱导表达产生的.采用转座子挽救法,我们从调控突变株C.glutamicumG25中获得了amrG1和amrG2两个目标基因.经分析鉴定,amrG1基因(NCBIGenBank接受号为AF532964)可能参与乙酸代谢调控,编码作用于pta-ack操纵子的一个调控因子.该调控因子基因序列全长732bp,开放阅读框含有243个氨基酸,分子量约为27kD.通过基因定点缺失和过量表达技术,在谷氨酸棒杆菌野生型菌株中分别构建了amrG1基因缺失菌株和表达菌株,并研究了它们在含有葡萄糖和/或乙酸不同碳源的基本培养基上生长时产生的PTA和AK酶活性特征.酶活性测定结果发现其中的amrG1基因缺失菌株和表达菌株存在着与野生型菌株不同的一系列酶学特征,分析显示:以野生型菌株为对照,amrG1基因缺失菌株在含有葡萄糖碳源的培养基上生长时表现出较高的PTA和AK酶活性,并且在葡萄糖和乙酸两种碳源上生长时表现出与乙酸碳源上生长时几乎同样的PTA和AK酶活性;amrG1基因过量表达对葡萄糖碳源上生长产生的PTA和AK酶活性有一定程度的抑制,即表现出与基因缺失情况相反的调控效应.根据以上结果分析,amrG1可能编码了作用于pta-ack操纵子的一个阻遏因子或共阻遏因子.
OCS photolytic isotope effects from first principles: sulfur and carbon isotopes, temperature dependence and implications for the stratosphere
J. A. Schmidt, M. S. Johnson, S. Hattori, N. Yoshida, S. Nanbu,R. Schinke
Atmospheric Chemistry and Physics (ACP) & Discussions (ACPD) , 2013,
Abstract: The isotopic fractionation in OCS photolysis is studied theoretically from first principles. UV absorption cross sections for OCS, OC33S, OC34S, OC36S and O13CS are calculated using the time-depedent quantum mechanical formalism and a recently developed ab-initio description of the photodissociation of OCS which takes into account the lowest four singlet and lowest four triplet electronic states. The calculated isotopic fractionations as a function of wavelength are in good agreement with recent measurements by Hattori et al. (2011) and indicate that photolysis leads to only a small enrichment of 34S in the remaining OCS. The photodissociation dynamics provide strong evidence that the photolysis quantum yield is unity at all wavelengths for atmospheric UV excitation, for all isotopologues. A simple stratospheric model is constructed taking into account the main sink reactions of OCS and it is found that overall stratospheric removal slightly favors light OCS in constrast to the findings of Leung et al. (2002). These results show, based on isotopic considerations, that OCS is an acceptable source of background stratosperic sulfate aerosol in agreement with a recent model study of of Brühl et al. (2012). The 13C isotopic fractionation due to photolysis of OCS in the upper stratosphere is significant and will leave a clear signal in the remaining OCS making it a candidate for tracing using the ACE-FTS and MIPAS data sets.
Robert J. Schinke
Journal of Sports Science and Medicine , 2007,
Abstract: Applied sport psychologists tend to begin their consulting relationships with national teams having formalized skills, and often, limited contextual and sport- specific understanding. The present report overviews the first four years of a long-term consulting relationship one practitioner developed with the Canadian National Boxing Team. From the vantage of an applied sport psychology consultant, I overview how a limited consulting role expanded into increased responsibilities and opportunities. Suggestions are provided for the aspiring sport psychology consultant interested in working with athletes and coaches within the combative sport of elite amateur boxing
Robert J. Schinke,Marc Ramsay
Journal of Sports Science and Medicine , 2009,
Abstract: There is scant literature where applied sport scientists have considered first hand experiences preparing professional boxers for world title bouts. The present submission reflects more than 10 years of applied experience working with professional boxers, residing in Canada. What follows is a composite of sequential steps that ownership and coaching staff of one Canadian management group have tried leading up to more than 20 world title bout experiences. The strategies proposed have been built progressively over time, and what follows is a general overview of a more detailed pre-bout structure from shortly in advance of a world title bout offer to the moment when the athlete enters the ring to perform. We propose that an effective structure is founded upon detailed a priori preparation, tactical decisions throughout bout preparation, and a thorough understanding by the athlete of what he will encounter during the title bout
Recovery of Extracellular Lipolytic Enzymes from Macrophomina phaseolina by Foam Fractionation with Air
Claudia Schinke,José Carlos Germani
Enzyme Research , 2013, DOI: 10.1155/2013/897420
Abstract: Macrophomina phaseolina was cultivated in complex and simple media for the production of extracellular lipolytic enzymes. Culture supernatants were batch foam fractionated for the recovery of these enzymes, and column design and operation included the use of P 2 frit (porosity 40 to 100?μm), air as sparging gas at variable flow rates, and Triton X-100 added at the beginning or gradually in aliquots. Samples taken at intervals showed the progress of the kinetic and the efficiency parameters. Best results were obtained with the simple medium supernatant by combining the stepwise addition of small amounts of the surfactant with the variation of the air flow rates along the separation. Inert proteins were foamed out first, and the subsequent foamate was enriched in the enzymes, showing estimated activity recovery (R), enrichment ratio (E), and purification factor (P) of 45%, 34.7, and 2.9, respectively. Lipases were present in the enriched foamate. 1. Introduction Macrophomina phaseolina (Tassi) Goid. [1], the only species of its gender, is a phytopathogenic filamentous fungus, belonging to the anamorphic Ascomycota, Botryosphaeriaceae family [2]. It was recently described as possessing “tools to kill” [3] due to its genome providing a diversified arsenal of enzymatic and toxin tools to destroy the host plants, a capacity that is confirmed by its ability to infect over 500 different plant species [4]. Thus, to presume that Macrophomina phaseolina is able to produce several enzymes suitable for industrial applications is a reasonable hypothesis. To this purpose, many studies on its cell wall degrading hydrolases were performed [5–12]. However, M. phaseolina produces several other extracellular enzymes [13] of potential industrial use, among them lipolytic enzymes, which are excreted into the culture media in different amounts depending on the strain and incubation conditions. No studies were found attempting to purify these lipolytic enzymes. Several processes in the food industry, as well as environmental and industrial biotechnological applications, use enzymes as biocatalysts [14] due to their many advantages over chemical catalysts: the ability to function under relatively mild conditions of temperature, pH, and pressure; their specificity and, in some cases, their stereoselectivity. In addition, they do not produce unwanted byproducts [15]. Lipases are of particular interest because of their many applications in oleochemistry, organic synthesis, the detergent industry, and nutrition [16], and there is constant search for new options [17]. Eco-friendly
Control of Multicellular Development by the Physically Interacting Deneddylases DEN1/DenA and COP9 Signalosome
Martin Christmann equal contributor,Tilo Schmaler equal contributor,Colin Gordon,Xiaohua Huang,?zgür Bayram,Josua Schinke,Sina Stumpf,Wolfgang Dubiel ,Gerhard H. Braus
PLOS Genetics , 2013, DOI: 10.1371/journal.pgen.1003275
Abstract: Deneddylases remove the ubiquitin-like protein Nedd8 from modified proteins. An increased deneddylase activity has been associated with various human cancers. In contrast, we show here that a mutant strain of the model fungus Aspergillus nidulans deficient in two deneddylases is viable but can only grow as a filament and is highly impaired for multicellular development. The DEN1/DenA and the COP9 signalosome (CSN) deneddylases physically interact in A. nidulans as well as in human cells, and CSN targets DEN1/DenA for protein degradation. Fungal development responds to light and requires both deneddylases for an appropriate light reaction. In contrast to CSN, which is necessary for sexual development, DEN1/DenA is required for asexual development. The CSN-DEN1/DenA interaction that affects DEN1/DenA protein levels presumably balances cellular deneddylase activity. A deneddylase disequilibrium impairs multicellular development and suggests that control of deneddylase activity is important for multicellular development.
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