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  • 1
    Keywords: Life sciences ; Cell Biology ; Microbiology ; Plant science ; Botany ; Aerospace engineering ; Astronautics ; Life sciences ; Cell Biology ; Aerospace Technology and Astronautics ; Microbiology ; Plant Sciences ; Springer eBooks
    Description / Table of Contents: Chapter 1: Gravity Sensing, Graviorientation and Microgravity -- Chapter 2: Methods for Gravitational Biology Research -- Chapter 3: Gravitaxis in Flagellates and Ciliates -- Chapter 4: Gravitropism in Tip-Growing Rhizoids and Protonemata of Characean Algae -- Chapter 5: Gravitropism in Fungi, Mosses and Ferns -- Chapter 6: Gravitropism in Higher Plants: Cellular Aspects -- Chapter 7: Gravitropism in Higher Plants: Molecular Aspects -- Chapter 8: Bioregenerative Life Support Systems in Space Research
    Abstract: This book summarizes what is currently known about gravity sensing and response mechanisms in microorganisms, fungi, lower and higher plants; starting from the historical eye-opening experiments from the 19th century up to today’s extremely rapid advancing cellular, molecular and biotechnological research. All forms of life are constantly 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,this books shows us some of these different ways. The book is written for plant biologists and microbiologists as well as scientists interested in space and gravitational biology
    Pages: XVII, 122 p. 36 illus., 24 illus. in color. : online resource.
    ISBN: 9783319938943
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 203 (1997), S. S7 
    ISSN: 1432-2048
    Keywords: Key words: Euglena ; Flagellates ; Gravitaxis ; Graviperception (threshold) ; Gravireceptor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. In the flagellate Euglena gracilis Klebs,␣gravitaxis is mediated by an active physiological receptor and is not the result of passive alignment of the cells in the water column. The threshold of this response was found at 0.08 〈 threshold 〈0.16 g during a recent space flight on the American shuttle Columbia, where the cells were subjected to different accelerations between 0 and 1.5 g; the response saturated at 0.32 〈 saturation ≤ 0.64 g. Over the whole duration of the mission no adaptation of the response to microgravity was observed. The whole body of the cell, rather than intracellular organelles, seems to act as statolith since suspending the cells in a density-adjusted medium (Ficoll) resulted in an inhibition of gravitaxis and even reversal of orientation at higher densities. Thus, the cytoplasm seems to exert a pressure on the respective lower membrane where it is hypothesized to activate stretch-sensitive specific ion channels, as indicated by inhibitor studies with gadolinium. One of the early steps in the sensory transduction chain seems to be a modulation of the membrane potential since ion-channel blockers, ionophores and ATPase inhibitors strongly inhibit gravitaxis in this flagellate without seriously affecting motility and phototaxis.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0197-8462
    Keywords: Paramecium ; Loxodes ; Tetrahymena ; pawn mutant ; ion channels ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Different species of ciliates (Paramecium biaurelia, Loxodes striatus, Tetrahymena thermophila) have been taken as model systems to study the effects of extremely low-frequency electromagnetic fields (50 Hz, 0.5-2.0 mT) on the cellular level. A dose-dependent increase in the mean swimming velocity and a decrease in the linearity of cell tracks were observed in all wild-type cells. In contrast, field-exposure did not increase the number of directional turns of the Paramecium tetraurelia pawn mutant (d4-500r), which is characterized by defective Ca2+-channels. The described changes indicate a direct effect of low frequency electromagnetic fields on the transport mechanisms of the cell membrane for ions controlling the motile activity of cilia. Bioelectromagnetics 18:491-498, 1997. © 1997 Wiley-Liss, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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