2,795 research outputs found
Gravity Sensing, Graviorientation and Microgravity
No full textGravity has constantly governed the evolution of life on Earth over the last 3.5 billion years while the magnetic field of the Earth has fluctuated over the eons, temperatures constantly change, and the light intensity undergoes seasonal and daily cycles. All forms of life are permanently exposed to gravity and it can be assumed that almost all organisms have developed sensors and respond in one way or the other to the unidirectional acceleration force. Here we summarize what is currently known about gravity sensing and response mechanisms in microorganisms, lower and higher plants starting from the historical eye-opening experiments from the nineteenth century up to today’s extremely rapidly advancing cellular, molecular and biotechnological research. In addition to high-tech methods, in particular experimentation in the microgravity environment of parabolic flights and in the low Earth orbit as well as in “microgravity simulators” have considerably improved our knowledge of the fascinating sensing and response mechanisms which enable organisms to explore and exploit the environment on, above and below the surface of the Earth and which was fundamental for evolution of life on Earth
Methods for Gravitational Biology Research
No full textTo study the impact of gravity on living systems on the cellular up to the organismic level, a variety of experimental platforms are available for gravitational biology and biomedical research providing either an almost stimulus-free microgravity environment (near weightlessness) of different duration and boundary conditions. The spectrum of real-microgravity research platforms is complemented by devices which are used to either increase the gravity level (centrifuges) or modify the impact of gravity on biological systems (clinostats and random-positioning machines) the so-called ground-based facilities. Rotating biological samples horizontally or in a two- or three-dimensional mode is often used to randomize the effect of gravity in the attempt to eliminate the gravity effect on sensing mechanisms and gravity-related responses. Sophisticated centrifuges have been designed allowing studies from cells up to humans, either on ground under hypergravity conditions (> 1 g) or in space, where they offer the chance to stepwise increase the acceleration force from 0 g (microgravity) to 1 g or higher and vice versa. In such a way, centrifuges are used to determine threshold values of gravisensitivity and to unravel molecular and cellular mechanisms of gravity sensing and gravity-related responses. By using the whole spectrum of experimental platforms, gravitational biologists gain deep insight into gravity-related biological processes and continuously increase our knowledge of how gravity affects life on Earth
Gravitaxis in Flagellates and Ciliates
No full textMotile microorganisms such as flagellates and ciliates use the gravity vector of the Earth to adjust their position in the water column. Oriented movement by gravity is called gravitaxis and can be positive (downward swimming) or negative (upward swimming). In addition, some ciliates modify their velocity according to the swimming direction (gravikinesis). Earth-bound research and experimentation under simulated and real microgravity have revealed that a heavy mass such as a statolith or the whole cell content presses onto a gravireceptor which perceives the signal. In some cases mechanosensitive ion channels have been identified as gravireceptors. The activation of the receptor results in a cascade of reactions which amplify the signal and result in a steering response changing the direction of movement
Evidence based leadership
No full textAuthor Markus PodduikinMasterarbeit Johannes Kepler Universität Linz 2024Arbeit gesperr
Improving the search for monitoring tools using recommender technology
No full textAuthor Markus Eisl BSc.Masterarbeit Universität Linz 2023Arbeit gesperr
Improving the search for monitoring tools using recommender technology
No full textAuthor Markus Eisl BSc.Masterarbeit Universität Linz 2023Arbeit gesperr
metal-organic framework 4H, 4H-octafluoroazobenezene perfluoroazobenzene
No full textauthor: Markus RödlKumulative Masterarbeit aus einem ArtikelMasterarbeit University of Innsbruck 2022Arbeit gesperr
metal-organic framework 4H, 4H-octafluoroazobenezene perfluoroazobenzene
No full textauthor: Markus RödlKumulative Masterarbeit aus einem ArtikelMasterarbeit University of Innsbruck 2022Arbeit gesperr
Strategi Pelayanan Lintas Budaya Berdasarkan Markus 4:1-34
No full textHarming & Katarina, Cross-cultural Service Strategy based on Mark 4: 1-34. The author conducted a study of the text of Mark 4: 1-34 using qualitative research literature study using the biblical hermeneutic principle. Based on the analysis of the text of Mark 4: 1-34 the authors find there are four cross-cultural service strategies namely by understanding local culture, using media. Harming & Katarina, Strategi Pelayanan Lintas budaya Berdasarkan Markus 4:1-34. Penulis melakukan penelitian terhadap teks Markus 4:1-34 dengan menggunakan penelitian kualitatif studi pustaka dengan menggunakan prinsip hermeneutik Alkitab. Berdasarkan analisis terhadap teks Markus 4:1-34 penulis menemukan ada empat strategi pelayanan lintas budaya yaitu dengan memahami budaya lokal, menggunakan media yang ada dalam budaya, memberdayakan potensi yang ada, dan menciptakan terobosan
Development of a Software Tool for Analyzing Experimental Data of a Recycling Machine
No full textAuthor DI Markus Kirchmayr, BScMasterarbeit Universität Linz 2022Arbeit nach Ablauf der Sperre auf den öffentlichen PCs in den Bibliotheken der JKU+Medizin abrufba
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