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  • 1
    Electronic Resource
    Electronic Resource
    Impregnation of silica gel with tetraalkylammonium salts in adsorption chromatography of neutral aromatic compounds
    Amsterdam : Elsevier
    Journal of Chromatography A 123 (1976), S. 231-236 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0021-9673(00)81121-8
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  • 2
    Electronic Resource
    Electronic Resource
    Photo-isomerisation and photo-degradation of dde
    Amsterdam : Elsevier
    Tetrahedron Letters 17 (1976), S. 4501-4504 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-4039(76)80153-0
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  • 3
    Electronic Resource
    Electronic Resource
    Alkylation of DNA and proteins in mice exposed to vinyl chloride
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 76 (1977), S. 259-266 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0006-291X(77)90720-3
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  • 4
    Electronic Resource
    Electronic Resource
    Cross sections and angular distributions for ^1^2C(γ,π^0)
    Amsterdam : Elsevier
    Physics Letters B 218 (1989), S. 143-147 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0370-2693(89)91409-3
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of the left-right asymmetry in the electrodisintegration of the deuteron
    Amsterdam : Elsevier
    Physics Letters B 339 (1994), S. 17-21 
    Details
    ISSN: 0370-2693
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0370-2693(94)91126-6
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Morphology of spiracles in adult Hyalomma truncatum ticks (Acari; Ixodidae) (1995)
    Springer
    Experimental and applied acarology 19 (1995), S. 287-306 
    Details
    ISSN: 1572-9702
    Keywords: Ticks ; Hyalomma truncatum ; spiracles ; morphology ; structural organization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Scanning electron microscopical investigations of fractures and corrosion casts of spirales in adult ticks of Hyalomma truncatum revealed a three-part structure consisting of the spiracular plate forming the outer part followed by the subostial space, which leads into the atrial chamber from which the main tracheal trunks arise. The spiracular plate sonsists of a thin surface plate perforated by aeropyles, an underlying interpedicellar space formed by pedicels and an inner thick base plate. The surface plate is subdivided into a porous and a non-porous area. The macula is surrounded by the porous area and cleft by the ostium, which is bounded by a lip. The lip rests on a stalk which passes through the subostial space and forms the lateral wall of the atrial chamber. The interpedicellar space is chambered comprising four types of chambers. Large pyriform chambers (type 1) open to the atmosphere via a large aeropyle and are connected at their base with a duct traversing the base plate. They correspond numerically and in their position with the large aeropyles and the ducts of the base plate. Each chamber is surrounded by four to six medium-sized tubular chambers (type 2) which are closed at both ends. Small tubular chambers (type 3) open to the atmosphere via a small aeropyle, are closed at their base and correspond in number and position to the small aeropyles. Elongated chambers (type 4) are arranged in two to three rows around the subostial space and are closed at both ends. The front row communicates with the subostial space via large gaps. All chambers interconnect with each other by slit-like fenestrations. Below the macula and surrounding the stalk is the subostial space. Over the medial half, the subostial space opens into the atrial chamber. The lateral wall of the atrial chamber is thick, whereas the opposite wall is thin, folded and can be everted and inverted. Inverted, the medial wall closes up the opening to the subostial space and the main tracheal trunks. The base of the atrial chamber sonsists of the openings of the main tracheal trunks only. It is concluded that the aeropyles constitute the functional openings of a spiracle, the interpedicellar space and the subostial space act as diffusion barrier and the atrial chamber is exclusively responsible for the motory process of in- and expiration and is the only closing device of the spiracle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00052620
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  • 7
    Electronic Resource
    Electronic Resource
    Evidence for the reproductive isolation of Dermacentor marginatus and Dermacentor reticulatus (Acari: Ixodidae) ticks based on cross-breeding, morphology and molecular studies (1997)
    Springer
    Experimental and applied acarology 21 (1997), S. 685-696 
    Details
    ISSN: 1572-9702
    Keywords: Dermacentor marginatus ; Dermacentor reticulatus ; nested PCR ; internal transcribed spacer ; scanning electron microscopy ; cross-breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The species status of Dermacentor marginatus and Dermacentor reticulatus was evaluated by scanning electron microscope (SEM) examination of adult ticks, cross-breeding experiments and molecular biological analysis of eggs derived from transspecific pairings. The SEM investigations including the morphometric quantification of phenotypic features resulted in an unequivocal differentiation of adult D. marginatus and D. reticulatus ticks. The cross-breeding experiments demonstrated that irrespective of whether female ticks of both species were applied with con- or transspecific male ticks or without males to sheep, they engorged and laid eggs. The larvae, however, developed only in eggs which originated from conspecific matings. A nested polymerase chain reaction (PCR) of the second internal transcribed spacer (ITS2) using the DNA of eggs from transspecific pairings and sequencing of the PCR products revealed two different genotypes. The genotypes of eggs originating from D. marginatus and D. reticulatus females of these pairings differed. However, the eggs deposited by D. marginatus always possessed the same two genotypes as did the eggs produced by D. reticulatus. These results argue for a strict reproductive isolation of D. marginatus and D. reticulatus and, therefore, for a separate species status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018412803414
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  • 8
    Electronic Resource
    Electronic Resource
    On the visual perception of the eyes in adult Hyalomma truncatum ticks (Acari: Ixodidae) (1997)
    Springer
    Experimental and applied acarology 21 (1997), S. 307-315 
    Details
    ISSN: 1572-9702
    Keywords: Ticks ; Hyalomma truncatum ; visual signals ; perception ; eyes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adult Hyalomma truncatum ticks with uncovered and foil-covered eyes were exposed to an upright-positioned rectangle as a target giving a luminance contrast ratio of 5:1 at a sun-simulating radiation. The transmission rate of the foil was less than 0.003%. Significantly (p≤0.05) more locomotorally active ticks with uncovered eyes (36.6%) responded to the target than ticks with foil-covered eyes (7.3%). When the rectangle was illuminated by monochromatic light at wavelengths ranging between 420 and 648 nm, the target induced a positive scototaxis in ticks with uncovered eyes regardless of the wavelength range. In contrast, ticks with covered eyes did not exhibita positive scototaxis at wavelength ranges of 553–585 and 608–648 nm and very few ticks responded only to other wavelength ranges. The results indicate that the eyes are the only or at least the most essential sense organs in the visual system of adult H. truncatum ticks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018459324370
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  • 9
    Electronic Resource
    Electronic Resource
    Detection and micro-scale isolation of a low molecular mass paralysis toxin from the tick, Argas (Persicargas) walkerae (2000)
    Springer
    Experimental and applied acarology 24 (2000), S. 615-630 
    Details
    ISSN: 1572-9702
    Keywords: Complex formation ; immuno-affinity chromatography ; low molecular mass neurotoxin ; synaptosomes ; tick paralysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study describes the isolation of a 11 kDa paralysis toxin from crude larval extracts of Argas (Persicargas) walkerae by exploiting the cross-reactivity of a monoclonal antibody (4B12), directed against the paralysis toxin of Rhipicephalus evertsi evertsi. This low molecular mass is in contrast to previous findings of a 60–70 kDa toxin for A. (P.) walkerae but is similar to neurotoxins isolated from venomous forms of the class Arachnida, which comprise the orders Araneae (spiders), Scorpionida (Scorpions) and Acari (ticks and mites). Since numerous antigenic bands, ranging between 11 and 115 kDa, were detected by the monoclonal antibody 4B12, the possibility of toxin-complex formation and the effect of pH on the latter were investigated by means of HPLC and ammonium sulphate precipitation. The results suggest that physiological conditions, with respect to pH and ionic strength, promote the formation of heterogeneous toxin-complexes while an acidic pH favours the formation of a more homogeneous toxin-containing complex. Furthermore, the effect of partially purified toxin on neurotransmitter release from crude rat brain synaptosomes was investigated, since tick paralysis toxins are hypothesised to inhibit neurotransmitter release from the presynaptic terminal. Both calcium-dependent, as well as calcium-independent release was inhibited by the toxin-containing sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026565222030
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  • 10
    Electronic Resource
    Electronic Resource
    Hyalomma truncatum (Acari; Ixodidae): investigations into the scototaxis of unfed adult ticks (1995)
    Springer
    Experimental and applied acarology 19 (1995), S. 53-64 
    Details
    ISSN: 1572-9702
    Keywords: Ticks ; Hyalomma truncatum ; visual behaviour ; scototaxis ; CO2 gradient ; temperature gradient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Under controlled test conditions, unfed male and female Hyalomma truncatum ticks exhibited a positive scototaxis to stationary, two-dimensional targets. Upright-positioned rectangles were the most attractive targets. The attractiveness of these targets increased with their size. Significantly more ticks responded scototactically positively to the targets under a luminance contrast ratio of 5:1, as compared with other luminance contrast ratios. Targets with an elevation angle of 13° were occupied more frequently than objects with higher elevation angles. Scototaxis was the same towards a stationary and a sinusoid oscillating target. When an upright-positioned rectangle was combined with a CO2 gradient, the number of ticks that migrated into the CO2 gradient and contacted the target did not increase significantly. The interval between exposure and first locomotion of the ticks, however, was significantly shorter under the influence of a CO2 gradient than in all other experiments without a CO2 gradient. A temperature gradient simulating a natural host (cattle) did not alter the scototaxis. The results of these investigations suggest that the positive scototaxis exhibited by adult H. truncatum ticks is not likely to be part of their appetence behaviour but rather searching behaviour to find adequate protection from harsh climatic conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00051937
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