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  • 1
    Electronic Resource
    Electronic Resource
    AN ELECTRON MICROSCOPE STUDY OF TWO FLAGELLATES. CHLOROPLAST STRUCTURE AND VARIATION (1953)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 56 (1953), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1953.tb30266.x
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  • 2
    Electronic Resource
    Electronic Resource
    A Simplified Method for Extraction of Reduced Cytochrome-552 and -556 from Euglena gracilis ( Z ) (1963)
    [s.l.] : Nature Publishing Group
    Nature 198 (1963), S. 783-784 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The extraction and purification of cytochromes-552 and -556 from Euglena have required large quantities of cells. In addition, the carotenoid and chlorophyll pigments add difficulties to the extraction procedure. Cytochrome-552 was spectrophotometrically identified in a saline supernatant from an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/198783b0
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  • 3
    Electronic Resource
    Electronic Resource
    Fine Structure of Chloroplasts in Two Flagellates (1952)
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 114-115 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] These flagellates were grown in chemically defined media5 in light and in darkness. In light, they were deeply pigmented ; in darkness they became completely colourless ; this process was reversible. In the present study, in which they were grown under continuous light for four to seven days, both ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/170114a0
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  • 4
    Electronic Resource
    Electronic Resource
    Microspectrophotometry of Euglena Chloroplast and Eyespot (1960)
    [s.l.] : Nature Publishing Group
    Nature 188 (1960), S. 601-602 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Euglena gracilis Z strain (obtained originally from Dr. S. H. Hutner, Haskins Laboratory, New York) cultured in a chemically defined medium under continuous fluorescent light (300 ft.-candles) in a temperature-controlled room of 25 C. was used for this work. Samples of Euglena were taken, during ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/188601b0
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  • 5
    Electronic Resource
    Electronic Resource
    Microspectrophotometry of Hæmosiderin Granules (1962)
    [s.l.] : Nature Publishing Group
    Nature 193 (1962), S. 977-978 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hsemosiderin is usually characterized by its histo-logical properties rather than its physico-chemical ones, and is defined as microscopically visible granules in tissue which give a positive Prussian blue stain3. Recently, several investigators, after painstaking isolation and analysis of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/193977a0
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  • 6
    Electronic Resource
    Electronic Resource
    The Structure of the Chloroplast (1959)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 10 (1959), S. 71-86 
    Details
    ISSN: 0066-4294
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.10.060159.000443
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  • 7
    Electronic Resource
    Electronic Resource
    In vivo Absorption Spectra of Euglena: Ghloroplast and Eyespot (1961)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 8 (1961), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The in vivo absorption spectra of the chloroplast and eyespot of Euglena gracilis were obtained by microspectro-photometry. The average chloroplast absorption spectrum shows major peaks at 430-43S and 675-685 mμ. The fine structure details of chlorophyll à show peaks at 675, 685 and 695 mμ. The average eyespot absorption spectrum shows major absorption in the region of 460-490 mμ, and two additional peaks near 510 and around 530 mμ with lesser peaks at 430 and 630 mμ. Some of these same absorption peaks were obtained for the eyespot of E. granulata and the “hematochrome flecks.” The eyespot spectrum indicates that probably more than one ca-rotenoid is present and that a correlation exists between the eyespot absorption spectrum and the Euglena phototactic action spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1961.tb01213.x
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  • 8
    Electronic Resource
    Electronic Resource
    Photomotion in Euglena gracilis I. Photokinesis II. Phototaxis (1958)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 5 (1958), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Photokinesis or the non-directed rate of swimming of Euglena gracilis for various light intensities was studied. The rate of swimming in white light was found to increase with light intensity until it reaches 0.16 mm./sec. at a saturation of 40 ft. candles, and then decreased with increasing light intensities. Polarized light appeared to be more effective (0.18 mm./sec. at 13 ft. candles) than non-polarized light.The action spectrum for photokinesis showed two peaks, a major one near 465 mμ, and another in the neighborhood of 630 mμ, having the values of 0.18 mm./sec. and 0.16 mm./sec. respectively at an intensity of 4 ft. candles.The action spectrum for phototaxis, or directed orientation, had a peak near 420 mμ and showed a maximum near 490 mμ. Both dark-grown and dark-adapted Euglena showed spectral peaks similar to those of the light-grown cells. For polarized light, the action spectrum had two additional peaks at 468 mμ and 508 mμ. The polarized light effect may indicate more than one light-absorbing pigment within the “eye spot” or that other pigments within Euglena were absorbing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1958.tb02525.x
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  • 9
    Electronic Resource
    Electronic Resource
    Environmental Factors Affecting Growth and Chlorophyll Synthesis in Euglena. I. Physical and Chemical. II. The Effectiveness of the Spectrum for Chlorophyll Synthesis. (1955)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 2 (1955), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. Light ⇌ dark reactions in the algal flagellate, Euglena gracilis, were studied.When cultures are aged, dark-adapted, or subjected to elevated temperatures, analysis of absorption spectra indicates the magnesium is removed from the chlorophyll molecule and the chlorophyll is transformed to pheophytin. It also appears from chemical analyses, that the dark-adapted and heat-treated organisms are similar. The kinetics in terms of activation-energy for growth and chlorophyll synthesis can be evaluated by their effective response to temperature. The action spectrum for greening indicates that in Euglena protochlorophyll is probably the light-acceptor, as has been found for higher plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1955.tb02407.x
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  • 10
    Electronic Resource
    Electronic Resource
    Development and Characteristics of the Euglena C-Type Cytochromes (1963)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 10 (1963), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Two spectrally different cytochromes, referred to as cytochrome-552 and -556 were isolated from Euglena gracilis (Z) grown under different environmental conditions. Their presence or absence was followed during the dark↔ light adaptation, and their concentrations calculated from spectral data. These studies indicate that cytochrome-552 is directly dependent on chlorophyll and photosynthesis, whereas cytochrome-556 is found in all euglenas in a constant amount, and is not dependent on photosynthesis. These cytochromes were further purified to determine differences if any in their physical-chemical properties. The apparent molecular weight calculated from the sedimentation constants is of the order of 11,000 for cytochrome-552, and of the order of 13,000 for cytochrome-556. The electrophoretic mobility shows that cytochrome-552 migrates towards the anode with a mobility depending on pH from 2.5–7.9 cm2/volt/sec. The oxidation-reduction potential for cytochrome-552 is of the order of +0.38 volts, and for cytochrome-556 is of the order of +0.32 volts. These and the other data are compared to similar cytochromes that have been isolated from bacteria, algae, higher plants, and animal cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1963.tb01660.x
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