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  • 1
    Electronic Resource
    Electronic Resource
    Hot-atom reactions of iodine in the liquid phase induced by x-ray resonance absorption (1972)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 76 (1972), S. 2639-2641 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100662a032
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  • 2
    Electronic Resource
    Electronic Resource
    Zone refining for the separation of radioactive trace contaminants from organic compounds (1968)
    s.l. : American Chemical Society
    Analytical chemistry 40 (1968), S. 60-64 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60257a006
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  • 3
    Electronic Resource
    Electronic Resource
    High Speed Cinemicrography of the Direct Photophobic Response of Euglena and the Mechanism of Negative Phototaxis (1975)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 22 (1975), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. The shock reaction of Euglena gracilis strain Z to a sudden increase in light intensity (the “direct photophobic response”) was examined by high speed cinemicrography. The response is expressed as a turning reaction toward the dorsal side of the cell, after a transduction time of 0.1–0.5 sec after the onset of stimulation. Transduction times, turning rates, and flagellar beat frequencies were measured by analyzing the filmed sequences. The experimental data are consistent with a mechanism of directional homeostasis in negative phototaxis that is based upon shading of the photoreceptor by the cell's posterior end.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1975.tb05216.x
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  • 4
    Electronic Resource
    Electronic Resource
    Motor Responses to Polarized Light and Gravity Sensing in Euglena gracilis (1976)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 23 (1976), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Euglena gracilis strain Z has a motor response which results in orientation with respect to the polarization of a light stimulus. Cells swim preferentially in a direction perpendicular to the plane of polarization of the stimulus. If 2 polarized stimuli are given from opposite directions, the preferred direction is, under certain circumstances, at right angles to the directions of both stimuli. Euglena also preferentially assumes an orientation that is at right angles to the force of gravity. The relationships between these responses and phototactic movements oriented with respect to the direction of the stimulus are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1976.tb03838.x
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  • 5
    Electronic Resource
    Electronic Resource
    Light-Induced Body Movement of Euglena gracilis Coupled to Flagellar Photophobic Responses by Mechanical Stimulation (1976)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 23 (1976), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. In low viscosity media, Euglena gracilis strain Z responds to a sudden change in light intensity by a cessation of forward movement, followed by a reorientation of the locomotor flagellum which results in turning of the cell around the lateral axis (photophobic response). At a viscosity interface between low [∼ 1 cP (centipoise)] and high (4000 cP) media, the cells exhibit avoidance responses or become immobilized in the higher viscosity medium. Upon changing the light intensity, free swimming cells have photophobic responses, while immobilized ones undergo body contractions. For cells immersed in media of varying viscosity, the delay between light stimulation and body contraction (transduction time) is shortest at high viscosities. From 500 to 2000 cP, where the cells are capable of both movement and light-induced body contractions, there is a logarithmic dependence of the transduction time on the viscosity. The transduction time does not vary appreciably with the intensity of the primary light stimulus within a range of 0.14-1.13 kW/m2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1976.tb05257.x
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  • 6
    Electronic Resource
    Electronic Resource
    Chemosensory Responses Toward Oxygen in Euglena gracilis (1978)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 25 (1978), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS Euglena gracilis strain Z, at a concentration of 106 cells/ml and in containers of ∽ 0.1-mm thickness, spontaneously forms dynamic ring patterns in the dark. These patterns are modified differentially by illumination with red and with blue light. The red light effect is abolished by treatment with an inhibitor of photosynthesis. Pattern formation is apparently the result of chemophobic responses to oxygen dissolved in the medium. Euglena can respond to both negative and positive concentration gradients, depending upon the absolute magnitude of oxygen concentration. The photo- and chemosensory transduction systems of Euglena interact at a stage which precedes the overt expression of motor responses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1978.tb04398.x
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  • 7
    Electronic Resource
    Electronic Resource
    Morphological Alterations in Euglena gracilis Induced by Treatment with CTAB (Cetyltrimethylammonium Bromide) and Triton X-100: Correlations with Effects on Photophobic Behavioral Responses (1978)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 25 (1978), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Treatment of Euglena gracilis with the cationic detergent CTAB at concentrations of 0.05 mM or higher selectively inhibited the ability of the cells to respond with flagellar reorientation to a sudden decrease of light intensity (step-down photophobic response). The ability to respond similarly to an increase in light intensity (step-up photophobic response) was unaffected even at detergent concentrations at which the step-down response was completely inhibited. Electron microscopy of cells treated with 1.0 mM CTAB revealed selective destruction of the membrane of the reservoir and flagellum. No selective effects upon the step-down or step-up photophobic responses were found upon treatment of the cells with Triton X-100.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1978.tb04169.x
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  • 8
    Electronic Resource
    Electronic Resource
    Photoeffects in a flavin-containing lipid bilayer membrane and implications for algal phototaxis (1974)
    [s.l.] : Nature Publishing Group
    Nature 248 (1974), S. 802-804 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIG. 1 Photocurrent observed as a function of applied potential on illumination of a bilayer lipid membrane containing riboflavin tetrapalmitate with white light (intensity 4 kW m^2). We report here light-induced electrical effect in an artificial bilayer membrane of the Mueller-Rudin type5 that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/248802a0
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  • 9
    Electronic Resource
    Electronic Resource
    Two Perpendicularly Oriented Pigment Systems involved in Phototaxis of Euglena (1969)
    [s.l.] : Nature Publishing Group
    Nature 221 (1969), S. 366-367 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Work now in progress in this laboratory is concerned with the pigment system of the primary photoreceptor. In such studies, interference from the shading pigments can be eliminated by the use of polarized light. An array of oriented pigment molecules is transparent to light which has its plane of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/221366a0
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  • 10
    Electronic Resource
    Electronic Resource
    Photosensory transduction in the flagellated alga, Euglena gracilis (1983)
    Springer
    Archives of microbiology 134 (1983), S. 204-207 
    Details
    ISSN: 1432-072X
    Keywords: Photosensory ; Cations ; pH ; Flagellated ; Algae ; Adaptation ; Euglena gracilis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Euglena were cultured under 3 W m-2 constant white light. In culture medium, cells show immediate and long lasting step-down photophobic responses and photoaccumulation behavior to blue light if dim red light-adapted for 30 min. However, if cells are suspended in buffered, saltcontaining solutions (adaptation buffers), strong step-down photobehavior and photoaccumulation responses are not observed for several hours. These behaviors gradually increase in strength to reach a maximum after 6–12 h; after which a stable response is maintained. The relative rates of appearance and the relative strengths of the responses are influenced by the concentrations of Ca2+ and K+, but not H+ or Na+ ions, in the adaptation buffers. Expression of the stepdown photobehavior thus requires that the cells adapt to the chemical environment in which they are suspended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00407758
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