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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen Fixation by Lichens of Arid Soil Crusts (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 96-97 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] About forty species of lichens are known to occur in the southern central and zone in Australia, and twelve of the commonest were exposed to a gas mixture containing nitrogen enriched with nitrogen-15. Thus each lichen was incubated in a Warburg flask for 6 days at 21 C under artificial light, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/209096b0
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  • 2
    Electronic Resource
    Electronic Resource
    Correlations between the Architecture of Shoots and the Particular Fragments of them found as Fossils (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 435-435 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Correlations between characters of presentation and characters of shoot architecture were sought among 76 fossil shoots (of 21 different kinds) on characters including, on one hand, length of fossil, whether branched or not, and whether terminal or not, and on the other whether phy Hot axis was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207435a0
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  • 3
    Electronic Resource
    Electronic Resource
    Sub-Doppler laser spectroscopy of the 1B2(1Δu) state of CS2 in a cold molecular beam (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 2752-2761 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Sub-Doppler excitation spectra of CS2 in the spectral range 30200−32300 cm−1 have been extensively measured with a frequency-doubled single mode cw dye laser in a cold collimated argon beam, seeded with CS2. From the rotational analysis of the measured spectra, the geometry and the position of the barrier to linearity of the CS2 molecule in the excited 1B2(1Δu) state has been determined. The observed bands are heavily perturbed and cluster around some intense vibrational transitions. A statistical analysis of the distribution of these bands showed that no chaotic behavior is present in the considered energy region and therefore a non-linear interaction with highly excited vibrational levels of the ground state cannot be responsible for this irregular vibronic structure, although chaotic regions for vibrational energies E(approximately-greater-than)12000 cm−1 in the electronic ground state have been reported in the literature. Different coupling mechanisms causing the observed perturbations of the rotational and vibrational structure are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467658
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  • 4
    Electronic Resource
    Electronic Resource
    USE OF SILICONE RUBBER MEMBRANE ENCLOSURES FOR PREPARATION OF ERYTHROPOIETIN ASSAY MICE (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 149 (1968), 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.1749-6632.1968.tb15132.x
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of a central regulator of stationary-phase gene expression in Escherichia coli (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 5 (1991), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: During carbon-starvation-induced entry into stationary phase, Escherichia coli cells exhibit a variety of physiological and morphological changes that ensure survival during periods of prolonged starvation. Induction of 30–50 proteins of mostly unknown function has been shown under these conditions. In an attempt to identify C-starvation-regulated genes we isolated and characterized chromosomal C-starvation- induced csi::lacZ fusions using the λplac Mu system. One operon fusion (csi 2::lacZ) has been studied in detail. csi 2::lacZ was induced during transition from exponential to stationary phase and was negatively regulated by cAMP. It was mapped at 59 min on the E. coli chromosome and conferred a pleiotropic phenotype. As demonstrated by two-dimensional gel electrophoresis, cells carrying csi 2::lacZ did not synthesize at least 16 proteins present In an isogenic csi 2+ strain. Cells containing csi 2::lacZ or csi 2::Tn10 did not produce glycogen, did not develop thermo-tolerance and H2O2 resistance, and did not induce a stationary-phase-specific acidic phosphatase (AppA) as well as another csi fusion (csi5::lacZ). Moreover, they died off much more rapidly than wild-type cells during prolonged starvation. We conclude that csi 2::lacZ defines a regulatory gene of central importance for stationary phase E. coli cells. These results and the cloning of the wild-type gene corresponding to csi 2 demonstrated that the csi 2 locus is allelic with the previously identified regulatory genes katF and appR. The katF sequence indicated that its gene product is a novel sigma factor supposed to regulate expression of catalase HPII and exonuclease III (Mulvey and Loewen, 1989). We suggest that this novel sigma subunit of RNA polymerase defined by csi 2/katF/appR is a central early regulator of a large starvation/stationary phase regulon in E. coli and propose ‘rpoS’ (‘σs’) as appropriate designations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1991.tb01825.x
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  • 6
    Electronic Resource
    Electronic Resource
    Microporous SiO2 and SiO2/MOx (M=Ti, Zr, Al) for ceramic membrane applications: A microstructural study of the sol-stage and the consolidated state (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 489-495 
    Details
    ISSN: 1573-4846
    Keywords: SiO2 ; microporous ; ceramic membrane ; gas separation ; microstructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Microporous SiO2 and SiO2/MO2 (M=Ti, Zr, Al; 10 mol% MOx) materials for gas separation membrane applications have been prepared from polymeric sols. Characterization of these sols with SAXS showed that the mean fractal dimension of the SiO2 sols is 1.3–1.4 with a radius of gyration of approximately 2.5 nm. The dried and calcined films are microporous and the pore size distribution was bimodal with maxima at diameters of 0.5 nm and 0.75 nm. For the SiO2/TiO2, SiO2/ZrO2 and SiO2/Al2O3 systems, much milder reaction conditions proved to be necessary to obtain sols with comparable fractal dimensions due to the high reactivity of the Ti/Zr/Al-alkoxides. Microporous supported membranes with molecular sieve-like gas transport properties can be prepared from a relatively wide range of sol structures: from polymers too small to characterize with SAXS to structures with fractal dimensions: 1〈d f〈2.04.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486296
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  • 7
    Electronic Resource
    Electronic Resource
    Expression and translation of the egg-laying neuropeptide hormone genes during post-embryonic development of the pond snail Lymnaea stagnalis (1994)
    Springer
    Cell & tissue research 275 (1994), S. 369-375 
    Details
    ISSN: 1432-0878
    Keywords: Post-embryonic development ; Gene expression ; Caudodorsal cell hormones (CDCH) ; In situ hybridization ; Immunocytochemistry ; Immunogold labelling ; Lymnaea stagnalis (Mollusca)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The neuroendocrine caudodorsal cells of Lymnaea stagnalis express two homologous genes, each encoding a polypeptide precursor. The precursors give rise to “cocktails” of neuropeptides that regulate egg-laying. The expression and translation of both egg-laying hormone genes during post-embryonic development were investigated by in situ hybridization and by electron-microscopic immunocytochemistry. Gene-II-specific transcripts and translation products were not found in caudodorsal cells in animals with shell heights smaller than 10 mm, in contrast to gene-I products that were present even at 3-mm shell height. The onset of expression of gene II coincides with the onset of release of products from the caudodorsal cells into the blood. Large electron-dense granules were found in caudodorsal cells of snails of all developmental stages investigated. These granules form part of the Golgi sorting and packaging pathway. Their presence suggests that differential sorting and packaging is possible during post-embryonic development, like in adults. The relationship of the differential expression of the two genes to the development of the caudodorsal cell system and its targets is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319436
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  • 8
    Electronic Resource
    Electronic Resource
    Subdividing vegetation on interspecific association (1967)
    Springer
    Plant ecology 15 (1967), S. 129-136 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two pioneer models for divisive classification of vegetation are applied to extensive data, and compared. Results are used for reappraisal of practical questions in exploiting information on interspecific association, and these considerations are linked to a situation still prevailing in association analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01976247
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  • 9
    Electronic Resource
    Electronic Resource
    Synthese von kristallin-flüssigen Verbindungen. I. n-Alkyl- und n-Alkoxyderivate des 3-Hydroxy-2,5-diphenyl-pyrazins (1966)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 33 (1966), S. 265-276 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es werden die Synthesen von 2 homologen Reihen des 3-Hydroxy-2,5-diphenyl-pyrazins und 2-Benzoyl-4(5)-phenyl-imidazols beschrieben. p-n-Alkyl- und p-n-Alkoxyphenylglyoxal-hydrate kondensieren unter ammoniakalischen Bedingungen bevorzugt zu den entsprechenden Imidazolylketonen und nur in geringen Ausbeuten zu Hydroxypyrazinen. Die Alkylhomologen des Pyrazins schmelzen ab Äthylderivat zu kristallin-flüssigen Phasen auf, die dem smektischen Typ angehören. Mit wachsenden Flügelgruppen treten Umwandlungspunkte in diesen Phasen auf. Die beiden ersten Glieder der Ätherreihe haben zusätzlich einen nematischen Bereich. Allen Imidazolylketonen fehlen diese Eigenschaften. Der Einfluß der α-ständigen Hydroxygruppe am heterocyclischen Mittelstück der gestreckten Molekeln wird diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19660330508
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  • 10
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    Beta Decay ofOs193to Levels inIr193 (1969)
    American Physical Society
    Details
    Publication Date: 1969-06-20
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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