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  • 1
    Electronic Resource
    Electronic Resource
    Numerical simulation of a viscous vortex ring interaction with a density interface (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 1505-1514 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The incompressible, variable-density Navier–Stokes equations in axisymmetric coordinates are solved for the interaction of a vortex ring with a density interface. The effect of progressively weakening stratification and variation in Reynolds number are examined. Secondary and tertiary ring formation, vortex rebound, and backflow jets are some of the features observed in the interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868264
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  • 2
    Electronic Resource
    Electronic Resource
    THE SYNTHESIS AND REACTIONS OF METHOXYINDOLE COMPOUNDS (1948)
    s.l. : American Chemical Society
    The @journal of organic chemistry 13 (1948), S. 547-553 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo01162a012
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  • 3
    Electronic Resource
    Electronic Resource
    The structure and evolution of the vorticity and temperature fields in thermals (1992)
    Springer
    Theoretical and computational fluid dynamics 3 (1992), S. 327-344 
    Details
    ISSN: 1432-2250
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The vorticity and temperature fields in axisymmetric thermals are studied via a projection method for the Navier-Stokes Boussinesq equations. Development of small-scale structure is observed at high Grashof numbers, and spreading rate, entrainment, mixing in the core, and generation of countersign vorticity are enhanced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417932
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Distinguishable functions for engrailed and Invected in anterior–posterior patterning in the Drosopila wing (1995)
    [s.l.] : Nature Publishing Group
    Nature 376 (1995), S. 424-427 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A dominant mutation at the invected (inv) locus was identified on the basis of a phenotypic transformation of the anterior compartment of the wing into a posterior compartment. The mutant produces wings with a symmetric double-posterior appearance (Fig. Ifl, b). Transformation from ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/376424a0
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  • 5
    Electronic Resource
    Electronic Resource
    Vorticity intensification and transition to turbulence in three-dimensional euler equations (1992)
    Springer
    Communications in mathematical physics 147 (1992), S. 371-394 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract The evolution of a perturbed vortex tube is studied by means of a second-order projection method for the incompressible Euler equations. We observe, to the limits of grid resolution, a nonintegrable blowup in vorticity. The onset of the intensification is accompanied by a decay in the mean kinetic energy. Locally, the intensification is characterized by tightly curved regions of alternating-sign vorticity in a 2n-pole structure. After the firstL ∞ peak, the enstrophy and entropy continue to increase, and we observe reconnection events, continued decay of the mean kinetic energy, and the emergence of a Kolmogorov (k −5/3) range in the energy spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096593
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of a mutation in Saccharomyces cerevisiae that produces mutant isoaccepting tRNAs for several of its tRNA species (1981)
    Springer
    Current genetics 3 (1981), S. 73-82 
    Details
    ISSN: 1432-0983
    Keywords: Mutant transfer RNA ; Pleiotropy ; Viability ; Temperature sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Genetic data presented in Bell et al. (1977) demonstrated that a mutation in Saccharomyces cerevisiae (designated mia) is responsible for the production of mutant isoaccepting tRNA molecules for some tRNA species. Besides extending this phenotype to other tRNAs, we have shown that mutant isoacceptors are produced at the expense of the normal levels of wild type tRNA and that the presence of mutant isoacceptors has no adverse effects on strains harbouring the mutation. The observation that mia strains have mutant isoacceptors as the predominant tRNA species under certain growth conditions suggests that mutant isoacceptors are biologically active molecules. Pulse-label and chase experiments indicate that mutant isoacceptors are slowly converted to wild type tRNA molecules in vivo, suggesting that they could be precursor molecules. This is consistent with the hypothesis that mia is defective in a modification process in the maturation of tRNA molecules. Analysis of a double mutant that produces mia isoacceptors which also lack N2-dimethylguanine shows that some of the modifications to tRNA molecules need not follow a specific sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419583
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  • 7
    Electronic Resource
    Electronic Resource
    Induction of null-activity mutants for the acid phosphatase-1 gene in Drosophila melanogaster (1972)
    Springer
    Biochemical genetics 6 (1972), S. 205-216 
    Details
    ISSN: 1573-4927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Sixteen null-activity mutants were obtained for the acid phosphatase-1 system (3–101.1) in Drosophila melanogaster using ethylmethanesulfonate as the mutagen. They were selected by combining an electrophoretic analysis and a spot test assay for acid phosphatase which, together, allowed the screening of large numbers of mutagenized chromosomes. Five mutants were obtained by electrophoretic analysis alone, and an additional 11 were recovered when the spot test was used. Flies homozygous for three of the Acph-1 0 mutants were found to be viable and fertile. Also, the relative mutability of two allozyme loci and two genes whose effect is on adult morphology were examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486404
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  • 8
    Electronic Resource
    Electronic Resource
    A mutant of Saccharomyces cerevisiae that exhibits multiple isoacceptors for several of its transfer RNAs (1977)
    Springer
    Molecular genetics and genomics 153 (1977), S. 145-151 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A strain of Saccharomyces cerevisiae, known to produce multiple isoaccepting forms of several tRNA's which differ from a standard wild type strain, has been studied genetically. The multiple isoaccepting tRNA phenotype behaves as if it is caused by a single recessive mutation. Five tetrads were analyzed and all showed a 2:2 segregation of mutant to wild type profiles for Phe-tRNAPhe. Furthermore, the multiple isoacceptors for the other tRNA's in the mutant strain are probably caused by the same mutation, since Tyr-tRNATyr and Val-tRNAVal also exhibit 2:2 segregation for mutant versus wild type tRNA profiles and the segregation pattern is the same as that for Phe-tRNAPhe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264729
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  • 9
    Electronic Resource
    Electronic Resource
    Suppressible P-element alleles of the vestigial locus in Drosophila melanogaster (1988)
    Springer
    Molecular genetics and genomics 212 (1988), S. 370-374 
    Details
    ISSN: 1617-4623
    Keywords: Cytotype ; Drosophila ; Gene expression ; P-element ; Vestigial
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A series of P-element insertion mutations at one site in the vestigial (vg) locus was tested for cytotype dependent effects on vg expression. The mutant phenotypes for four P-element vg alleles were suppressed when the alleles were stabilized in the P-cytotype. The suppression was observed whenever repressor-producing P-elements were present in the genome. Genetic and molecular analysis indicated that the suppression is not due to excision or other irreversible alterations of the inserts. The results are consistent with a model in which somatic P-element repressor binding to the ends of P-element inserts can modify the effects of these inserts on target gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334709
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  • 10
    Electronic Resource
    Electronic Resource
    Expression of a Drosophila melanogaster amber suppressor tRNASer in Caenorhabditis elegans (1993)
    Springer
    Molecular genetics and genomics 241 (1993), S. 26-32 
    Details
    ISSN: 1617-4623
    Keywords: Heterologous tRNA ; Suppressor ; Amber ; Transformation ; Caenorhabditis elegans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The purpose of this study was to test a cloned amber-suppressing tRNASer gene derived from Drosophila melanogaster for its ability to produce amber suppression in the nematode Caenorhabditis elegans. To date, all characterized nonsense suppressors in C. elegans have been derived from tRNATrp genes. Suppression was assayed by monitoring the reversal of a mutant tra-3 phenotype among individuals transformed with the cloned Drosophila suppressor gene. An amber allele of tra-3 results in masculinization of XX animals with accompanying sterility. Complete suppression was observed among the transformants. The presence of the heterologous transgene, in both suppressed experimental animals and controls injected with a non-suppressing wild-type Drosophila tRNASer gene, was verified by PCR amplification of DNA from single worms using primers flanking the tRNASer gene. Suppression by the heterologous transgene was comparable in quality to that produced by endogenous C. elegans suppressors, and, in frequency as well as quality, to that produced by a transgenic C. elegans tRNATrp-derived suppressor. Thus, a heterologous suppressor gene will function in C. elegans, and it need not be based on tRNATrp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280197
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