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  • Electronic Resource  (10)
  • 1975-1979  (10)
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  • Electronic Resource  (10)
  • Book  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Electron energy loss spectra of dye vapors (1978)
    Springer
    Applied physics 15 (1978), S. 185-190 
    Details
    ISSN: 1432-0630
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Electron energy loss studies of POPOP andp-terphenyl in the vapor phase at an incident electron energy of 25 eV have been performed. The spectra covering an energy loss between 0 and 9 eV revealed a considerable initial triplet population under electron impact excitation. The implications for electron-beam pumped vapor phase dye lasers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928206
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The activity of ant product of the Salmonella phage P22 against the closely related but heteroimmune phage L (1978)
    Springer
    Molecular genetics and genomics 161 (1978), S. 197-204 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary P22 mutants defective in the early gene 24 are complemented by phage L in mixed infection. P22 12 - and P22 23 - mutants are not complemented by phage L. Gene function 24 of an L prophage is turned on by a superinfecting P22 24 - mutant and complements the missing function of the defective P22 phage. Since this transactivation of prophage gene 24 depends on a functional gene ant in the superinfecting P22 mutant, it indicates derepression for leftward directed gene expression in prophage L. On the contrary neither the rightward directed expression of gene 12 nor of gene 23 in prophage L can be turned on by superinfecting P22 24 - 12 - or P22 24 - 23 - mutants (and also not by P22 12 - and P22 23 -) to a degree sufficient for complementation of simultaneously superinfecting L virB 12 - or L virB 23 - mutants. The failure to detect release of repression for rightward directed gene expression of prophage L corresponds to the earlier observation (Prell, 1975) that P22 superinfecting L lysogens cannot release replication inhibition for simultaneously infecting phage L. The results are discussed with respect to the mechanism underlying the different action of P22 antirepressor in L and in P22 lysogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00274188
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  • 3
    Electronic Resource
    Electronic Resource
    Ant-mediated transactivation of early genes in Salmonella prophage P22 by superinfecting virulent P22 mutants (1978)
    Springer
    Molecular genetics and genomics 164 (1978), S. 331-334 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The virulent mutants P22 vir B vy and P22 vy mutants, both insensitive to mnt-repressor, transactivate the early genes of a P22 prophage. The transactivation of early P22 prophage genes depends strictly on the expression of gene ant (“antirepressor”-protein) by the superinfecting P22 mutant and therefore occurs by derepression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00333164
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  • 4
    Electronic Resource
    Electronic Resource
    Cis- and trans-activity of P22 antirepressor protein against c-repression specified by the closely related Salmonella phages L and Px1 (1979)
    Springer
    Molecular genetics and genomics 168 (1979), S. 323-329 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ant product of Salmonella phage P22, synthesized by its immI region, releases when acting in cis replication inhibition for phages P22 and L. When ant product acts in trans on a coinfecting immunity sensitive phage (Thomas-Bertani-experiment as test for release of replication inhibition) full replication ensues only if both superinfecting phages are homologous in the specificities of their immC and immI regions. If these regions are heterologous, differing in immC, immI or in both, the replication of the phage expected to be complemented by ant is inhibited. This inhibition is observed in both L- and Px-lysogenic bacteria and can be released in case of ant - amber phages by action of ant in cis in su +lysogenic bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271503
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  • 5
    Electronic Resource
    Electronic Resource
    The role of ant-product of Salmonella phage P22 in the process of transactivation of prophage Px1 genes (1977)
    Springer
    Molecular genetics and genomics 156 (1977), S. 61-69 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Phage P22 replicates in Px1-lysogenic cells because the ant-product (“antirepressor-protein”) of P22 removes the repression exerted by the Px1-prophage. P22 ant - phages however are repressed in Px1-lysogens. The ant-product of P22 is also required for the transactivation of the “early” genes 24, 12, and 23 of the Px1-prophage. P22 virB3 ant - mutants, which are insensitive to c-repression and therefore replicate in Px1-lysogens, are unable to transactivate early genes of the Px1-prophage or of a coinfecting Px1 phage. Transactivation of the “late” gene 19 is insensitive to repression and independent of ant-activity. This suggests the presence of a separate, and oR-independent, promotor for late gene expression. —A more rigorous proof for functional homology in early gene regulation of P22 and Px1 is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00272253
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  • 6
    Electronic Resource
    Electronic Resource
    Ant-mediated inactivation of Salmonella phage L-specified repression at oR of prophage L (1979)
    Springer
    Molecular genetics and genomics 176 (1979), S. 33-36 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ant product of phage P22 inactivates repression of prophage L at the right-hand operator oR and allows for transactivation of prophage gene 12. The transactivation efficiency observed with a series of phage and prophage recombinants, using single superinfection of a lysogenic bacterium, is about the same as that recently observed at oL of prophage L. This finding is in contrast to the failure to demonstrate derepression at oR of prophage L in an experimental system employing double superinfection (Prell, 1978a). The reasons for the differing results are discussed and it is shown that derepression by the ant product in trans at oR of the prophage is not modified to any significant degree by the immunity specificity (L or P22) of the prophage or of the superinfecting phage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334292
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  • 7
    Electronic Resource
    Electronic Resource
    Regulation of gene expression in Salmonella phage P22 (1975)
    Springer
    Molecular genetics and genomics 136 (1975), S. 351-360 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Transactivation experiments were performed involving the genetically related Salmonella phages P22, L and Px 1 in order to find out if more than one positively acting regulatory product is engaged in the expression of vegetative gene functions of each of these phages. The results obtained with Px 1 - and L-lysogenic cells superinfected with P22 suggest the following conclusions: 1. The expression of the early genes 12 and 23 and of the late gene 19 (lysozyme synthesis) is positively regulated by two different regulatory products, since P22 transactivates in prophage Px 1 both early and late genes (Prell, 1973), in prophage L only late genes. 2. The transactivation by P22 of the lysozyme gene of prophage L takes place in the presence of L repressor. This conclusion is suggested, since the superinfecting P22 does not derepress early gene expression (see 1.), and is confirmed by demonstration of replication inhibition for L phage in L lysogenic cells doubly superinfected with L and P22 phages (Thomas-Bertani-experiment). 3. The late gene regulatory protein seems to be synthesized by gene 23, as transactivation experimetns with both L- and Px 1 , prophages suggest. 4. The expression of gene 23 itself is turned on by an early regulatory product. The gene which codes for it is still unidentified. However its product seems to by highly specific, since it is active on Px 1 - but not on L-prophage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00341719
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  • 8
    Electronic Resource
    Electronic Resource
    Blitzspektroskopische Unterduchung der Triplettbildung von Nathhthalin, 1-Methoxynaphthalin und 1-Cyanonaphthalin in Lösung in Gegenwart der Fluoreszenzlöscher Tetrachlorkohlenstoff oder Diäthylamin (1975)
    Springer
    Colloid & polymer science 253 (1975), S. 333-333 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02352096
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  • 9
    Electronic Resource
    Electronic Resource
    Die Beeinflussung der Fluoreszenzlöschung durch Schweratomeffekte und durch Charge-transfer-Wechselwirkung, untersucht am Singulett-Triplett-Übergang einiger Anthrazene (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 220-220 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01638155
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  • 10
    Electronic Resource
    Electronic Resource
    The oviposition and life cycle ofAnthrax tigrinus, [Dipt.: Bombyliidae] a parasite of carpenter bees[Hym.: Xylocopidae] (1976)
    Springer
    BioControl 21 (1976), S. 227-233 
    Details
    ISSN: 1573-8248
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé Xylocopa virginica (L.) peut être parasité parAnthrax tigrinus (De Geer). Grâce à l'emploi d'un appareil à rayson X et à des observations dans la nature et en laboratoire, on a localisé les œufs des parasites bombiliides et suivi le développement des stades larvaires depuis l'éclosion de l'œuf. L'utilisation du microscope électronique Stereoscan a facilité l'acquisition de détails sur la ponte et le comportement associé.
    Notes: Abstract Xylocopa virginica (L.) is readily parasitized byAnthrax tigrimus (De Geer). By using an x-ray technique and by observing field and laboratory populations of carpenter bees and their bombyliid parasites we located the parasite's eggs and followed their developmental stages through emergence. The acquisition of details on oviposition and associated behavior was facilitated by using a stereoscan electron microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02371755
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