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  • 2000-2004  (5)
  • 1970-1974  (2)
  • 1900-1904
  • 2000  (5)
  • 1971  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Nail dystrophy in association with polydactyly and benign familial hypercalcaemia (2000)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 25 (2000), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2230.2000.00630.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sensitivity to chemically diverse phagostimulants in a single gustatory neuron of a polyphagous caterpillar (2000)
    Springer
    Journal of comparative physiology 186 (2000), S. 13-19 
    Details
    ISSN: 1432-1351
    Keywords: Key words Catalpol ; Grammia ; Gustation ; Iridoid glycoside ; Phagostimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Caterpillars of the arctiid moth, Grammia geneura, are polyphagous, but species of Plantago are amongst their preferred food plants. A neuron in the medial styloconic sensillum on the galea has been shown to have a general phagostimulatory function. Experiments with binary mixtures and cross-adaptation have demonstrated that it responds to some sugars, to several amino acids, and also to catalpol. Catalpol is a plant secondary compound in Plantago and a phagostimulant for the caterpillars. The possible significance of combining sensitivity to nutrient compounds with sensitivity to a secondary compound is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050002
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Herbicide Spray Drift Odor: Measurement and Toxicological Significance (2000)
    Springer
    Archives of environmental contamination and toxicology 38 (2000), S. 390-397 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. The toxicological significance of exposure of members of the public to spray drift odors of four herbicide formulations (three 2,4-dichlorophenoxyacetic [2,4-D] acid derivatives and one MCPA [4-methyl-2-chlorophenoxyacetic acid] derivative) has been studied using a combination of novel odor measurement and classic residue analysis techniques. The mean odor concentrations, generated during the spraying of the commercial herbicide formulations under simulated aerial application conditions, were about twofold higher for 2,4-D ethylhexyl ester (22,500 OUc/m3) and MCPA (30,100 OUc/m3) than for 2,4-D butyl ester (12,400 OUc/m3) and 2,4-D amine (11,800 OUc/m3). Detailed investigations determined that the odors are due to trace manufacturing impurities and additives in the commercial formulations, whereas the herbicide active ingredients are odorless. Measured airborne herbicide active ingredient concentrations under the simulated aerial application conditions were all below their respective occupational safety and health TLV-TWA values, indicating that exposures of toxicological significance as a result of spray drift are unlikely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449910052
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Population structure of the wreckfish Polyprion americanus determined with microsatellite genetic markers (2000)
    Springer
    Marine biology 137 (2000), S. 1077-1090 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We examined population structure in the wreckfish, Polyprion americanus, by assaying six microsatellite loci in 422 individuals collected throughout the geographic range. Eighteen hapuku, P. oxygeneios, were assayed at the same loci for use as an outgroup. Expected heterozygosities ranged from 0.49 to 0.88 and averaged 0.66. Allele-frequency distributions at those loci indicated that samples from the eastern North Atlantic, western North Atlantic and the Mediterranean were genetically similar, confirming the pattern seen in a previous analysis of mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs). Both mtDNA and microsatellite studies differentiated northern and southern wreckfish stocks. However, in contrast to the mtDNA studies, allelic variation at microsatellite loci clearly differentiated wreckfish from two Southern Hemisphere locations, Brazil and the South Pacific. Far more genetic variation was observed at microsatellite loci than with mtDNA RFLPs (haplotype diversity averaged 0.01), and we saw more evidence of population structure with the microsatellite loci. The differentiation between southern and northern wreckfish supports the distribution records, which indicate that wreckfish do not occur in the tropics. Temperature profiles and current patterns throughout the southern oceans apparently also prevent significant gene flow between the South Pacific and Brazilian samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270000392
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Taste Sensitivity of Insect Herbivores to Deterrents is Greater in Specialists Than in Generalists: A Behavioral Test of the Hypothesis with Two Closely Related Caterpillars (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 547-563 
    Details
    ISSN: 1573-1561
    Keywords: Heliothis virescens ; Heliothis subflexa ; caterpillar ; diet breadth ; deterrent compound ; feeding behavior ; postingestive toxicity ; plant secondary metabolite
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Sensitivity of caterpillars of Heliothis virescens, a generalist, and H. subflexa, a specialist, to eight different plant secondary compounds was examined behaviorally. The compounds were nicotine hydrogen tartrate, hordenine, caffeine, sinigrin, linamarin, arbutin, chlorogenic acid, and salicin. All compounds deterred feeding, at least at the higher concentrations, but the generalist was less affected than the specialist. Thus the hypothesis that specialists have greater sensitivity to deterrents than generalists was supported. In most cases deterrence occurred on first encounter, indicating that the response was sensory; in some cases short-term postingestive effects also appeared to play a role. The larger quantities of deterrent-containing food ingested by H. virescens sometimes resulted in measurable postingestive effects during the second control test. This did not occur in H. subflexa, which more commonly rejected the deterrent-containing food on first contact. The contrast between the species is discussed in relation to tradeoffs involved in different diet breadths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005430010314
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The structure of the terminal sensilla on the maxillary palps of Locusta migratoria (L.), and changes associated with moulting (1971)
    Springer
    Cell & tissue research 121 (1971), S. 48-68 
    Details
    ISSN: 1432-0878
    Keywords: Chemoreceptor ; Locusta ; Fine structure ; Development ; Moulting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The basic structure of the terminal sensilla of Locusta migratoria resembles that of Schistocerca gregaria. There are commonly six or ten neurons whose dendrites extend almost to the opening of the peg. Proximally the dendrites are clothed by a neurilemma cell which also encloses a basal cavity through which their ciliary region passes. The tormogen cell encloses the receptor-lymph cavity and actively secretes material into it. The receptor-lymph cavity and the basal cavity are quite separate. The development of new pegs at a moult is described. After apolysis the scolopale extends across the subcuticular space and protects the dendrites, which remain in a functional condition until shortly before ecdysis. As the trichogen cell grows out to form a new peg the tip is surrounded by a mass of electron-dense material, probably derived from the receptorlymph cavity. The function of this material is unknown. Regeneration of the dendrites is considered. The possible mechanism by which the tip of the peg opens and closes is considered and the general structure of the organule is discussed in relation to functioning.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330916
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Conditions for the onset of vaporization in superfluid liquid He II in the presence of heat flow (1971)
    Springer
    Journal of low temperature physics 4 (1971), S. 485-488 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Studies of the vaporization onset associated with heat flow are used as a tool to probe the superfluid thermohydrodynamics during entropy transport. Onset-flux-density data of the heat flow suggest that the normal fluid viscous force dominates during entropy transport from a single source (strip) to bulk He II over a layer of thickness 10 −4 cm (upper bound) or less.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00631127
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    Paper (German National Licenses)
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