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'Membrane Fluidity' in keywords
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2001 (1)
1993 (1)
1976 (1)
1Author    Maya Velitchkova, A. Ntoaneta Popova, Tzvetelina MarkovaRequires cookie*
 Title    Effect of Membrane Fluidity on Photoinhibition of Isolated Thylakoids Membranes at Room and Low Temperature  
 Abstract    The relationship betw een thylakoid membrane fluidity and the process of photoinhibition at room and low (4 °C) temperature was investigated. Two different membrane perturbing agents -cholesterol and benzylalcohol were applied to manipulate the fluidity of isolated pea thylakoids. The photochemical activity of photosystem I (PSI) and photosystem II (PSII), polarographically determ ined, were measured at high light intensity for different time of illumination at both temperatures. The exposure of cholesterol-and benzylalcohol-treated thylakoid membranes to high light intensities resulted in inhibition of both studied photo­ chemical activities, being more pronounced for PSII compared to PSI. Time dependencies of inhibition o f PSI and PSII electron transport rates for untreated and membranes with altered fluidity were determ ined at 20 °C and 4 °C. The effect is more pronounced for PSII activity during low-temperature photoinhibition. The data are discussed in terms of the determining role of physico-chemical properties of thylakoid membranes for the response o f photosyn­ thetic apparatus to light stress. 
  Reference    Z. Naturforsch. 56c, 369—3 (2001); received January 3/February 1 2001 
  Published    2001 
  Keywords    Membrane Fluidity, Photoinhibition, Thylakoid Membranes 
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 TEI-XML for    default:Reihe_C/56/ZNC-2001-56c-0369.pdf 
 Identifier    ZNC-2001-56c-0369 
 Volume    56 
2Author    T. Zvetana, R. L. Azarova An, M. Aya, Y. V. ElitchkovaRequires cookie*
 Title    Spin Label Study of Apomembranes and Purple Membranes  
 Abstract    Three spin-labelled fatty acids were used to detect the dynamics of lipid bilayer o f apomem­ branes and purple membranes. It was found that ESR spectra of spin labels bound to apo­ membranes showed a temperature-induced changes rather similar to those seen with purple membranes. At the same time, however, the values of hyperfine splitting parameter 2Tm were lower as compared to purple membranes. The results pointed out that the removal of the retinal from purple membranes affects the dynamics of lipid bilayer and apomembranes were more rigid structure than those of purple membranes. 
  Reference    Z. Naturforsch. 48c, 500—503 (1993); received July 3/September 16 1992 
  Published    1993 
  Keywords    Purple Membranes, Apomembranes, Retinal, Membrane Fluidity, Spin Label 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0500.pdf 
 Identifier    ZNC-1993-48c-0500 
 Volume    48 
3Author    ChristianF. BardeleRequires cookie*
 Title    Particle Movement in Heliozoan Axopods Associated with Lateral Displacement of H ighly Ordered Membrane Domains  
 Abstract    Freeze-fracture studies reveal that extrusive organelles displaying saltatory particle movements in centrohelidian axopod are attached to highly ordered domains within the plasma membrane. It is postulated that the motive force for lateral displacement of these membrane domains with the adhering organelle is located immediately underneath the plasma membrane being either part of the peripheral membrane proteins or attached filaments alined parallel to the axopodial micro­ tubules. The attachment domain is interpreted organelle discharge by membrane fusion. 
  Reference    (Z. Naturforsch. 31c, 190 [1976]; received January 14 1976) 
  Published    1976 
  Keywords    Saltatory Movement, Heliozoan Axopod, Extrusive Organelles, Membrane Fluidity, Freeze Fracture Technique 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0190.pdf 
 Identifier    ZNC-1976-31c-0190 
 Volume    31