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  • Articles  (8)
  • Articles: DFG German National Licenses  (8)
  • 1990-1994  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis, structure, and reactivity of an antiaromatic, 2,5-dicarboxy-stabilized 1,4-dihydropyrazine (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 6017-6023 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00041a018
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  • 2
    Electronic Resource
    Electronic Resource
    Structural Characterization of Solid Self-Ordered Thin Films of Zinc(II) and Palladium(II) Octakis(.beta.-decoxyethyl)porphyrin (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 8971-8976 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100087a026
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  • 3
    Electronic Resource
    Electronic Resource
    New type of charge-transfer complex from an antiaromatic electron donor. Possible radical cation stabilization by the captodative effect (1991)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 113 (1991), S. 5910-5911 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00015a082
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  • 4
    Electronic Resource
    Electronic Resource
    Low allozyme and mtDNA variability in the island endemic speciesDrosophila sechelia (D. melanogaster complex) (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 101-104 
    Details
    ISSN: 1420-9071
    Keywords: Genetic variability ; mitochondria ; allozymes ; Drosophila sechellia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Genetic variability ofD. sechellia is investigated at both mitochondrial and nuclear levels. The results reveal the existence of a single main type of mtDNA with very few variants and a very low enzyme polymorphism. This situation is consistent with the small population size of this specialized species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01955430
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  • 5
    Electronic Resource
    Electronic Resource
    Distribution and migration of pesticide residues in mosquito control impoundments St. Lucie County, Florida, USA (1993)
    Springer
    Environmental geology 22 (1993), S. 26-32 
    Details
    ISSN: 1432-0495
    Keywords: Pesticide migration ; Mosquito control impoundment ; Water management techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract This project was designed to: (1) document the distribution and migration of organochlorine pesticide residues within marsh substrates of 18 St. Lucie County mosquito control impoundments located along the Indian River Lagoon estuary, and (2) evaluate the impact of water management techniques on residue mobility. Our results indicate that detectible concentrations of organochlorine compounds, applied between the late 1940s and early 1950s, are present in 16 of the 18 St. Lucie County mosquito control impoundments. These compounds are primarily restricted to the surficial, organic-rich wetland sediment, which, based upon geotechnical analysis, was exposed to the atmosphere at a time when the impoundments were subjected to pesticide treatment. Contaminated sediments are present below the surficial, organic-rich layer, suggesting that some vertical migration of pesticides has occurred. It is unlikely that leaching associated with the downward percolation of impounded water was responsible for this migration as pesticide residues were never detected within thein situ pore waters. An alternative explanation is that biological processes (e.g., rooting, burrowing) facilitated the downward flux of organochlorine compounds into sediment horizons not subjected to direct treatment. Eighty-eight surface water samples obtained from two impoundments subjected to contrasting water management techniques were analyzed for pesticide content. None of the surficial water samples collected in association with these impoundments contained detectible concentrations of organochlorine compounds. These samples were unfiltered and contained as much as 25 mg/1 of particulate organic matter. This suggests that the currently preferred management technique (RIM), which is designed to maintain water quality, limit mosquito production, and provide for ecological continuity, does not hydraulically mobilize pesticide residues into the Indian River Lagoon estuary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00775281
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  • 6
    Electronic Resource
    Electronic Resource
    Horizontal transmission versus ancient origin:Mariner in the witness box (1994)
    Springer
    Genetica 93 (1994), S. 161-170 
    Details
    ISSN: 1573-6857
    Keywords: transposable element ; mariner ; molecular evolution ; horizontal transmission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The transposable elementmariner has been found in many species ofDrosophilidae, several groups of Arthropods, and more recently in Platyhelminthes as well as in a phytopathogenic fungus. In the familyDrosophilidae, the distribution ofmariner among species shows many gaps, and its geographical distribution among endemic species is restricted to Asia and Africa. Amongmariner elements in species within and outside theDrosophilidae, the similarities in nucleotide sequence and the amino acid sequence of the putative transposase reveal many phylogenetic inconsistencies compared with the conventional phylogeny of the host species. This paper discusses the contrasting hypotheses of horizontal transfer versus ancestral origin proposed to explain these results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435248
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  • 7
    Electronic Resource
    Electronic Resource
    Evolution of the transposable element mariner in the Drosophila melanogaster species group (1992)
    Springer
    Genetica 86 (1992), S. 37-46 
    Details
    ISSN: 1573-6857
    Keywords: Mariner ; Drosophila ; molecular evolution ; transposable element
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The population biology and molecular evolution of the transposable element mariner has been studied in the eight species of the melanogaster subgroup of the Drosophila subgenus Sophophora. The element occurs in D. simulans, D. mauritiana, D. sechellia, D. teissieri, and D. yakuba, but is not found in D. melanogaster, D. erecta, or D. orena. Sequence comparisons suggest that the mariner element was present in the ancestor of the species subgroup and was lost in some of the lineages. Most species contain both active and inactive mariner elements. A deletion of most of the 3′ end characterizes many elements in D. teissieri, but in other species the inactive elements differ from active ones only by simple nucleotide substitutions or small additions/deletions. Active mariner elements from all species are quite similar in nucleotide sequence, although there are some-species-specific differences. Many, but not all, of the inactive elements are also quite closely related. The genome of D. mauritiana contains 20–30 copies of mariner, that of D. simulans 0–10, and that of D. sechellia only two copies (at fixed positions in the genome). The mariner situation in D. sechellia may reflect a reduced effective population size owing to the restricted geographical range of this species and its ecological specialization to the fruit of Morinda citrifolia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00133709
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  • 8
    Electronic Resource
    Electronic Resource
    Genetics of a nonoptimal behavior: Oviposition preference ofDrosophila mauritiana for a toxic resource (1994)
    Springer
    Behavior genetics 24 (1994), S. 433-441 
    Details
    ISSN: 1573-3297
    Keywords: Oviposition behavior ; ecological specialization ; Drosophila sechellia ; Morinda citrifolia ; aliphatic acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Among three sibling species of theD. melanogaster subgroup, two are generalists (D. simulans andD. mauritiana), while the third,D. sechellia, specializes on a single toxic resource, the fruit ofMorinda citrifolia. D. sechellia, resistant to the toxics, prefers to oviposit on morinda;D. simulans, which is very sensitive, is strongly repelled.D. mauritiana exhibits an aberrant behavior since it prefers to lay its eggs on morinda, where its embryos are killed. Oviposition behavior, studied in parental species, F1 hybrids, and backcrosses, was mostly an additive genetical trait. Further investigations were made withD. mauritiana andD. simulans carrying recessive markers. The X and second chromosomes had no effect, while a clear effect was found for chromosome 3. Since the toxicity of morinda is due to middle-length fatty acids, the behavior of the three species toward various acids was investigated. We found thatD. sechellia exhibited a general oviposition preference for acids, whileD. simulans was repelled by acids with at least four carbons. SurprisinglyD. mauritiana exhibited behavior quite similar to that ofD. simulans. Preference for morinda inD. sechellia andD. mauritiana could be mediated by different chemicals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01076179
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