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  • Blue-green algae  (4)
  • 1975-1979  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of electric fields on photophobic reactions in blue-green algae (1977)
    Springer
    Archives of microbiology 114 (1977), S. 83-86 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Electric fields ; Phormidium uncinatum ; Photophobic reaction ; Sensory transduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of external electric fields on photoaccumulations of Phormidium uncinatum in light traps has been studied. 1. In direct current fields the phobic reaction of trichoms leaving the light field is not impaired if a voltage of 2.5 V is not exceeded. With voltages between 3 and 7 V the trichoms are motile, but phobic reactions are cancelled, provided the organisms are oriented more or less parallel to the electric field lines. Higher voltages cause the algae to die within minutes. 2. Only alternating current fields of very low frequencies (≤10-3 Hz) have similar effects. Sine waves are more effective than triangular ones, but less than square waves. A hypothesis is proposed according to which sensory transduction of photophobic reactions in blue-green algae is mediated by changes in the endogenous membrane potential. This potential might be interfered with by the application of an external electric field, thus inhibiting photophobic reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429635
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  • 2
    Electronic Resource
    Electronic Resource
    Extracellular and intracellular determination of light-induced potential changes during photophobic reactions in blue-green algae (1978)
    Springer
    Archives of microbiology 119 (1978), S. 75-79 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Light-induced potential changes ; Phormidium uncinatum ; Photophobic response ; Sensory transduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Light-induced potential changes have been measured in the filamentous blue-green alga Phormidium uncinatum both intracellularly and between the two ends of a trichome. There is evidence that these potential changes are correlated with photophobic reactions in this organism. 1. The potential changes follow the light-dark regime with a lag phase of about 10 s. The photophobic reaction time has been found to be about the same length of time. 2. The action spectra of both externally and internally measured light-induced potential changes correspond with the photophobic action spectrum, indicating the participation of the main photosynthetic pigments of Phormidium, chlorophyll a and phycobilins. A hypothesis is being discussed according to which sensory transduction between photoreceptor and motor apparatus of the cell is mediated by light-induced electrical potential changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407931
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  • 3
    Electronic Resource
    Electronic Resource
    Further evidence for the electron pool hypothesis (1976)
    Springer
    Archives of microbiology 110 (1976), S. 301-303 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Electron pool hypothesis ; Photophobic reaction ; Photosystems ; Phormidium uncinatum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In continuation of experiments with photo-system II inhibitors [3-(3,4-dichlorophenyl)-1,1-dimethylurea and 2,5-dibromo-3-methyl-6-isopropylbenzoquinone] the effect of photosystem I inhibitors was studied. 1. Neither the plastocyanin inhibitor, potassium cyanide, nor the ferredoxin antagonist, disalicyliden propandiamin, markedly affected those phobic reactions which are mediated by the electron transport via photosystem II into the electron pool. 2. On the other hand those phobic reactions, which are triggered by an increased flow of electrons out of the pool, are specifically inhibited by both substances. These results are regarded as further evidence that there is only one electron pool, the level of which triggers photophobic reactions and is located in the linear electron transport chain near photosystem II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690242
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence of electrical potential changes in photophobically reacting blue-green algae (1978)
    Springer
    Archives of microbiology 118 (1978), S. 115-119 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Light-induced potential changes ; Phormidium uncinatum ; Photophobic response ; Sensory transduction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The correlation between photophobic responses and light-induced electric potential changes has been studied in the blue-green alga Phormidium uncinatum. 1. The photophobic reaction time depends on both length of preillumination and presentation time of stimulus. Under optimal conditions a reaction time of about 10 s has been determined. 2. Light-induced potential changes can be measured by means of external electrodes with a small gap between them bridged by a population of perpendicularly oriented trichomes. These potential changes follow a light-dark cycle with a lag phase of about 10 s. 3. The amplitude of these light-induced potential changes increases with light intensity until it reaches a saturation value of about 12 mV at 10000 lx. The action spectrum resembles the photophobic action spectrum with peaks in the absorption region of C-phycoerythrin and chlorophyll a. The significance of light-induced potential changes as a means of sensory transduction for photophobic responses in blue-green algae is being discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406083
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