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  • Springer  (1,815)
  • 2005-2009
  • 1980-1984
  • 1965-1969  (1,815)
  • 1966  (1,815)
  • 1
    Electronic Resource
    Electronic Resource
    Actinomycin-D inhibition of phytochrome-mediated responses (1966)
    Springer
    Planta 69 (1966), S. 70-78 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Actinomycin D vermag verschiedene phytochromgesteuerte Reaktionen etiolierter Pflanzen zu hemmen. So wird z. B. die von Rotlicht induzierte Aufrollung des ersten Blattes von im Dunkeln kultivierter Gerste besonders durch Act. D gehemmt, wenn man das Antibioticum ungefähr 80 min nach der Belichtung appliziert; spätere oder frühere Darbietung wirkt weniger oder überhaupt nicht. Die Hemmung wird durch Desoxyguanosin aufgehoben. Unter Berücksichtigung der bekannten Aktionsweise des Actinomycins D bei der DNS-abhängigen RNS-Synthese und der aus der Literatur bisher bekannten Tatsachen über phytochromgesteuerte Reaktionen muß vermutet werden, daß das Phytochrom eng an das DNS gebunden ist (vermutlich auch in Plastiden und Mitochondrien!) und als Repressor-System fungiert. Rotlicht löst diese Bindung und ermöglicht dadurch die Gen-Wirkung.
    Notes: Summary Actinomycin-D inhibits phytochrome-mediated responses of etiolated plants. In the unrolling response of a barley first leaf the inhibition by act. D is greater when the antibiotic is applied 80 minutes after irradiation; earlier or later applications are less inhibitory. Inhibition is relieved by deoxyguanosine applied before or after act. D. Similar effects are found with the plumular hooks of peas and beans. These results suggest that phytochrome-mediated responses involve RNA production on a DNA template. The location of phytochrome in the cell is discussed in relation to its possible association with DNA, especially that of the plastids and mitochondria. Phytochrome may thus act as a repressor of gene sequences involved (for instance) in the removal of etiolation symptoms, red light (660 nm) causing its dissociation from DNA. Far-red radiation may reverse the effects by causing re-association of phytochrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380212
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  • 2
    Electronic Resource
    Electronic Resource
    The phenomenon of overshoot in the case of stomatal opening (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 280-280 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00621659
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  • 3
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 712-716 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00602747
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  • 4
    Electronic Resource
    Electronic Resource
    Meiotic studies in the bug, chrysocoris stollii wolff (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 91-91 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00594777
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  • 5
    Electronic Resource
    Electronic Resource
    The phenomenon of damping in geotropically induced feedback oscillations (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 160-160 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591902
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  • 6
    Electronic Resource
    Electronic Resource
    Endodermislike tissue in the hypocotyl of carthamus tinctorius L. (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 205-205 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624815
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  • 7
    Electronic Resource
    Electronic Resource
    A simple device for measurement of circular dichroism in the visible and ultraviolet regions (1966)
    Springer
    Cellular and molecular life sciences 22 (1966), S. 622-624 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Es wird ein einfacher Apparat beschrieben, der als Zusatzgerät zum. Zeiss-Spektralphotometer PMQ II zur Messung von Zirkulardichroismus zu verwenden ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01895291
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  • 8
    Electronic Resource
    Electronic Resource
    Biosynthesis of plant sterols. Conversion of cholesterol to pregnenolone inDigitalis purpurea (1966)
    Springer
    Cellular and molecular life sciences 22 (1966), S. 506-507 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Un échantillon purifié de cholestérol-4-C14 a été absorbé par des feuilles de 2 plantes deDigitalis purpurea. Après 18 jours on a extrait les plantes et séparé les composés radioactifs. Environ 1% des métabolites globales a été constaté en forme de pregnénolone. Ainsi le cholestérol peut agir comme précurseur des stérols végétaux.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01898654
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  • 9
    Electronic Resource
    Electronic Resource
    Changes in mitotic indices in roots of Vicia faba (1966)
    Springer
    Chromosoma 18 (1966), S. 421-437 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Roots of Vicia faba were treated with solutions of colchicine or IAA or both. Mitotic indices and the frequencies of the different stages of mitosis were determined immediately after a three hour treatment or following a 24 hour period of recovery. Roots scored after treatment with colchicine for three hours showed several effects, none of which were reversed by simultaneous treatment with IAA. Treatment with IAA for three hours had little detectable effect on mitotic index (MI) on the frequencies of the various stages of mitosis. After a recovery period, following a three hour treatment, of 24 hours, colchicine treated roots showed a significant increase in their MI; this was due largely to an increase in the number of metaphases but it was also due in part to the presence of tetraploid cells in division. IAA treated roots revealed an inhibition of mitotic activity, which was most marked at 3.13–6.26×10−4 M IAA. The results from roots treated with mixtures of colchicine and IAA for three hours and fixed 24 hours later showed: 1) the increase in MI induced by colchicine is reversed by IAA, the intensity of the reversal increasing with increasing concentrations of IAA; 2) reductions in the total numbers of cells in prophase or in metaphase occur after treatment with different concentrations of IAA; 3) IAA leads to a reduction in the number of tetraploid cells seen in division. It appears that colchicine induces a change in the pattern of mitotic activity 24 hours after the end of treatment and its effects are reversed by IAA. At 4.2×10−4 M IAA a balance occurs between the opposing effects of colchicine and IAA and the MI is not significantly different from that of the controls. It is suggested that one result of a treatment with colchicine is a change in the level of growth factors in root meristems. This change, which appears to result in a temporary increase in MI is reversed by the addition of IAA. Thus one of the growth factors, the level of which has been affected, is replaceable by exogenous IAA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332546
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  • 10
    Electronic Resource
    Electronic Resource
    Über Fettkristalle Der Leber (1966)
    Springer
    Histochemistry and cell biology 7 (1966), S. 318-326 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung An Gefrierschnitten der menschlichen Leber können folgende Fettristalle auftreten: 1. Nadeiförmige Kristalle in Fetttropfen von mehr als 10 μ Durchmesser, die wahrscheinlich ganz aus Triglyceriden bestehen. Die Triglyceridkristalle bilden sich ohne Zusammenhang mit spontaner oder künstlicher Autolyse und der damit verbundenen hydrolytischen Fettspaltung. Die Kristallbildung wird durch Formalin-Fixierung verstärkt, durch Färbungen, histochemische Reaktionen und Einschlußmedien nur wenig beeinflußt. 2. Autolyse-Fettkristalle (anisotrope Autolyselipide). Sie bilden sich zugleich mit isotropen Autolyselipiden bei ausreichend erhaltener Esteraseaktivität (z.B. nach kurzer Formalin-Fixierung) als Produkt spontaner oder künstlicher Autolyse und damit einer hydrolytischen Fettspaltung. Sie treten in Form feiner Nadeln und Körnchen (wahrscheinlich überwiegend Fettsäurekristalle) und als Sphärokristalle (vielleicht Phosphatidkristalle) auf. Die Autolysefettkristalle spiegeln ebenso wie die isotropen Autolyselipide die Esteraseaktivität wider und versprechen damit Einblick in den Fettstoffwechsel der Leber. Ihr Nachweis erfolgt am besten am ungefärbten Präparat.
    Notes: Summary The following fat crystals are observed in frozen sections of human liver: 1. needle-like crystals in fat-droplets of a diameter of more than 10 μ, which consist apparently almost entirely of tri-glycerides. The formation of tri-glyceride crystals does not depend on spontaneous or artificial autolysis and the hydrolytic lipolysis connected herewith. The formation of the crystals is enhanced through formalin fixation; staining, histochemical reactions and mounting media have hardly any influence on it. 2. Autolysis fat crystals (anisotropic autolysis lipids). If esterase activity is still present (i.e. after short lasting formalin fixation) they form together with isotropic autolysis lipids as a product of spontaneous or artificial autolysis and the lipolysis resulting herefrom. They occur as fine needles or granules (probably predominantly fatty acid) or as spherocrystals (probably phosphatide crystals). Autolysis fat crystals as well as isotropic autolysis lipids reflect an esterase activity thus giving insight into the fat metabolism of the liver. The best method to demonstrate them is in the unstained section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306618
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