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Search Results: 1 - 10 of 401338 matches for " Schenk M "
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Klinische Studien/Klinische Praxis: Corifollitropin alpha (Elonva) in der t glichen Praxis Erfahrungen aus dem Kinderwunschinstitut
Schenk M
Journal für Gyn?kologische Endokrinologie , 2013,
Das Hepatopulmonale Syndrom
Schenk P,Müller C
Journal für Gastroenterologische und Hepatologische Erkrankungen , 2004,
Abstract: Das Hepatopulmonale Syndrom kommt als Komplikation einer Reihe von Lebererkrankungen vor. Es ist durch die typische Trias Lebererkrankung (meist Zirrhose), intrapulmonale Vasodilatation auf kapill rem und pr kapill rem Niveau und pathologische arterielle Oxygenierung charakterisiert. Es kann mit anderen, prim r kardialen und pulmonalen Erkrankungen koexistieren. Neben diffuser pulmonaler Vasodilatation nahe der Gasaustauschzone (mit verminderter H moglobin-Oxygenierung im zentralen kapill ren Blutstrom) kommt es weit seltener zu lokalisierten, arterioven sen Anastomosen. Als hauptverantwortlicher Mediator wird vermehrt produziertes Stickoxid angenommen. Die Diagnose beruht einerseits auf einem erniedrigten PaO2 oder einer erh hten AaDO2 in der arteriellen Blutgasanalyse, andererseits auf einer positiven Kontrastechokardiographie oder positiven Perfusionsszintigraphie mit 99mTechnetium-makroaggregiertem Albumin. Die Pr valenz betr gt bei Patienten mit Zirrhose 5 32 %, das Mortalit tsrisiko ist erh ht (unabh ngiger Risikoparameter). Die einzige anerkannte Therapie stellt die Lebertransplantation dar.
High Lipid Induction in Microalgae for Biodiesel Production
Kalpesh K. Sharma,Holger Schuhmann,Peer M. Schenk
Energies , 2012, DOI: 10.3390/en5051532
Abstract: Oil-accumulating microalgae have the potential to enable large-scale biodiesel production without competing for arable land or biodiverse natural landscapes. High lipid productivity of dominant, fast-growing algae is a major prerequisite for commercial production of microalgal oil-derived biodiesel. However, under optimal growth conditions, large amounts of algal biomass are produced, but with relatively low lipid contents, while species with high lipid contents are typically slow growing. Major advances in this area can be made through the induction of lipid biosynthesis, e.g., by environmental stresses. Lipids, in the form of triacylglycerides typically provide a storage function in the cell that enables microalgae to endure adverse environmental conditions. Essentially algal biomass and triacylglycerides compete for photosynthetic assimilate and a reprogramming of physiological pathways is required to stimulate lipid biosynthesis. There has been a wide range of studies carried out to identify and develop efficient lipid induction techniques in microalgae such as nutrients stress (e.g., nitrogen and/or phosphorus starvation), osmotic stress, radiation, pH, temperature, heavy metals and other chemicals. In addition, several genetic strategies for increased triacylglycerides production and inducibility are currently being developed. In this review, we discuss the potential of lipid induction techniques in microalgae and also their application at commercial scale for the production of biodiesel.
Microalgae Isolation and Selection for Prospective Biodiesel?Production
Van Thang Duong,Yan Li,Ekaterina Nowak,Peer M. Schenk
Energies , 2012, DOI: 10.3390/en5061835
Abstract: Biodiesel production from microalgae is being widely developed at different scales as a potential source of renewable energy with both economic and environmental benefits. Although many microalgae species have been identified and isolated for lipid production, there is currently no consensus as to which species provide the highest productivity. Different species are expected to function best at different aquatic, geographical and climatic conditions. In addition, other value-added products are now being considered for commercial production which necessitates the selection of the most capable algae strains suitable for multiple-product algae biorefineries. Here we present and review practical issues of several simple and robust methods for microalgae isolation and selection for traits that maybe most relevant for commercial biodiesel production. A combination of conventional and modern techniques is likely to be the most efficient route from isolation to large-scale cultivation.
A Framework for Agent-based Human Interaction Support
Axel Bürkle,Wilmuth Müller,Uwe Pfirrmann,Manfred Schenk
Journal of Systemics, Cybernetics and Informatics , 2008,
Abstract: In this paper we describe an agent-based infrastructure for multimodal perceptual systems which aims at developing and realizing computer services that are delivered to humans in an implicit and unobtrusive way. The framework presented here supports the implementation of human-centric context-aware applications providing non-obtrusive assistance to participants in events such as meetings, lectures, conferences and presentations taking place in indoor "smart spaces". We emphasize on the design and implementation of an agent-based framework that supports "pluggable" service logic in the sense that the service developer can concentrate on coding the service logic independently of the underlying middleware. Furthermore, we give an example of the architecture's ability to support the cooperation of multiple services in a meeting scenario using an intelligent connector service and a semantic web oriented travel service.
Density functional theory for a model quantum dot: Beyond the local-density approximation
S. Schenk,P. Schwab,M. Dzierzawa,U. Eckern
Physics , 2010, DOI: 10.1103/PhysRevB.83.115128
Abstract: We study both static and transport properties of model quantum dots, employing density functional theory as well as (numerically) exact methods. For the lattice model under consideration the accuracy of the local-density approximation generally is poor. For weak interaction, however, accurate results are achieved within the optimized effective potential method, while for intermediate interaction strengths a method combining the exact diagonalization of small clusters with density functional theory is very successful. Results obtained from the latter approach yield very good agreement with density matrix renormalization group studies, where the full Hamiltonian consisting of the dot and the attached leads has to be diagonalized. Furthermore we address the question whether static density functional theory is able to predict the exact linear conductance through the dot correctly - with, in general, negative answer.
Effect of a shape of terrain on a horizontal deformation of the line structures
Jan Schenk
Acta Montanistica Slovaca , 2007,
Abstract: This paper deals with an influance of the mining subsidence on an intensity of the deformation of the line structures. The size of the deformation is depended not only on size of the horizontal movements but also on a different size of the mining subsidence in concrete segment of the construction. If the terrain is sloped down and the mining subsidence are increasing in the direction of a slope the deformation of a segment is also increasing. On the other hand if the terrain and the mining subsidence in the direction of a slope is rising, then the deformation decreases. It is necessary for appraisal of straining of the linear structures to take into consideration not only the horizontal movements but also the gradient of terrain for changes of the mining subsidence of the construction. The simulation of calculation of the global deformation is given as an example.
Die Eroberung des Aztekenreichs
Mareike Schenk
Skriptum : Studentische Onlinezeitschrift für Geschichte und Geschichtsdidaktik , 2011,
Die Osteonekrose des Fu es: Eine übersicht
Schenk S
Journal für Mineralstoffwechsel , 2007,
Abstract: Die Osteonekrose (ON) am Fu ist eine heterogene Gruppe von Krankheitsbildern, die sich deutlich hinsichtlich Klinik, Verlauf, Pr dilektionsalter und Prognose unterscheiden. Ebenso sind die Ursachen für diese Erkrankungen vielf ltig: Neben idiopathischen finden sich auch posttraumatische und postoperative Formen. Seltene Ursachen sind Kollagenosen, Stoffwechselerkrankungen wie Diabetes mellitus und Kortikoidtherapie. ON finden sich geh uft nach Nierentransplantationen. Je nach Ursache tritt eine ON geh uft in typischer Lokalisation auf. Idiopathische Formen findet man am Os naviculare pedis Morbus K hler 1 (MK1), an den Metatarsalek pfchen Morbus K hler 2, "Freiberg s disease" (MK2), an den Sesambeinen und an der Apophyse des Calcaneus. Operationsbedingte F lle sind geh uft am Metatarsalek pfchen 1 nach Versorgung eines Hallux valgus lokalisiert, posttraumatische Nekrosen am Talus. In diesem Artikel werden die idiopathischen Formen hinsichtlich Klinik und Therapie n her beleuchtet. Bezüglich der Therapie gibt es konservative und operative Ans tze. Die wissenschaftlichen Daten zur Behandlung von idiopathischen Nekrosen sind sp rlich, die Behandlungsstrategien jedoch einheitlich und allgemein anerkannt.
Risk Perception and Its Foundation among Swedish Individuals Occupationally Exposed to Air Pollutants and Chemicals: A Comparison of 1975 and 2011
Linda Schenk
ISRN Public Health , 2013, DOI: 10.1155/2013/469714
Abstract: Although work environment conditions have improved much in the last decades, occupational exposures to chemicals and air pollutants still cause adverse health effects. The risk perception of occupational exposures to hazardous substances and the motivations for it have been investigated through a questionnaire study. These results have also been compared to previous studies performed by the largest trade union confederation in Sweden in 1975. In the current survey, 30% of the respondents believe to be at risk, 48% not, and 22% state to be unsure. The proportion of persons experiencing to be at risk due to exposures to chemicals or air pollution at work is unexpectedly similar to that of 1975. The explanations offered for the risk perception were in many cases vague and of a subjective nature, but again results are similar to those of 1975. References to more solid justifications such as performed exposure measurements or medical health checks are scarce, with the latter case being as scarce today as in 1975. There are only a few indications that a more systematic management of work environment issues has developed at Swedish workplaces; for instance, managers were more commonly stated as a source of information in 2011 than in 1975. 1. Introduction Working conditions have a major impact on public health and welfare. In Sweden, occupational diseases are estimated to cause at least 1000 fatalities per year [1]. Although the work environment in Sweden has gone through major improvements from a physicochemical perspective during the past forty years [2], exposure to hazardous air pollution should not be considered an issue of the past. Statistics are available on the percentage of employed Swedes stating to be exposed to air pollutants, defined as palpable dust or chemicals, during at least 1/4th of their time at work since 1997. The percentages are quite stable; in 1997, 23% of the workforce stated to be exposed at least 1/4th of their time at work [3]; in 2011, the corresponding number was 22% [4]. The highest level during this period, 24%, was recorded in 2007 [5]. As there are approximately 4.5 million workers in Sweden, this can be expressed as close to one million Swedes are exposed to air pollutants at work for at least a 1/4th of their working time. A survney performed in spring 2010 indicated that 0.5% of the employed women and 0.4% of the employed men had experienced work-related disorders due to chemical exposures during the last twelve months [6]. Individuals’ risk perception and the foundations for that belief are important targets for
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