16 research outputs found

    Die Grundwasserfauna des Nordwestens von Niedersachsen unter besonderer Beruecksichtigung der Crustaceen Abschlussbericht

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    TIB Hannover: FR 3613 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

    Erosionsfestigkeit von Hellern. Bodenkunde Endbericht

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    SIGLEAvailable from TIB Hannover: F95B1743 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

    DNA-Entlassung aus Bakterien, DNA-Ueberdauerung und genetische Transformation im Boden bei Freisetzungssimulierung Abschlussbericht

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    An overview is given on the basic mechnisms of bacterial gene transfer processes including conjugation, transduction and transformation, and ecological requirements of these processes are discussed. Emphasis is put on investigations in situ and in microcosmos simulating natural habitats. Transfer frequencies have to be considered as being far from negligible. It is likely that the dynamics of gene transfer play a vital part of the population dynamics characteristic of natural ecosystems and that the transfer can include DNA of all species present. Data suggest that DNA adsorbed on soil particles escape the nucleolytic degradation and that adsorbed plasmid DNA and chromosomal DNA fragments are available for transformation of a naturally competent gram-negative soil bacterium. Gene transfer is considered in relation to the safety of releasing genetically engineered microorganisms to the environment. Such consideration have led to the development of biological containment systems which cause a controlled cell death by the regulated expression of genes with cell-killing formations. (WEN)Available from TIB Hannover: F96B431+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

    Einfluss periodischer und aperiodischer Ueberflutung auf den Stoffwechsel und die Verbreitung von Halophyten

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    SIGLEAvailable from TIB Hannover: D.Dt.F. AC 1000(43,54) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman

    T. 1: DNA-Entlassung aus transgenen Zuckerrueben waehrend der Vegetations-und Ueberwinterungsphasen und horizontaler Gentransfer im Boden. T. 2: Die Ausbreitung von rekombinanter DNA auf landwirtschaftlichen Flaechen Abschlussbericht

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    SIGLEAvailable from TIB Hannover: F99B989+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman

    Entwicklung einer Pruefvorschrift zur Erkennung von synergistischen Wirkungen zwischen membranschaedigenden Substanzen und anderen Schadstoffen

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    A method was developed to quantify toxic combination effects of environmental chemicals. The assumption that a membrane damaging substance A enhances the cytotoxic effects of a substance B was confirmed by our experiments with human fibroblasts. Membrane damaging and cytotoxic effects correlated well with their log P_O_W-values (up to r=0.99, p<0.01). The cytotoxic effects correlated well with the membrane damage (up to r=0.99, p<0.01). Quantification of synergistic effects was obtained by comparing growth inhibition induced either by substance B alone or in combination with subtoxic concentrations of substance A. The log of the 'synergistic combination factor' ([EC_2_0_s_u_b_s_._B-EC_2_0_s_u_b_s_._A_+_B]/c_s_u_b_s_._A) correlated well with the log P_O_W-value of substance A (r=0.97, p<0.01). The subtoxic concentration of substance A needed for enhancement of growth inhibition induced by substance B by a factor 2 was obtained using the equation log c=-0.56.log P_O_W_._s_u_b_._A+1.90. (orig.)SIGLEAvailable from TIB Hannover: RN 8908(94-7) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekUmweltbundesamt, Berlin (Germany)DEGerman

    Eintrag von Bioelementen durch Voegel auf Mellum Abschlussbericht

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    Available from TIB Hannover: F95B1708 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLENiedersaechsisches Ministerium fuer Wissenschaft und Kultur, Hannover (Germany)DEGerman

    Untersuchungen zur Verwendung von Bioindikatoren fuer die Umweltueberwachung im Aestuarbereich der Elbe, Weser und Ems. T. 1 Zum Vorkommen und Lebenszyklus euryhaliner Gammariden im Elbe-, Weser- und Ems-Astuar

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    With 10 tabs., 23 figs., 188 refs.Available from Oldenburg Univ. (DE). Fachbereich 7 - Biologie / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
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