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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 100 (1978), S. 6501-6502 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 285-286 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Measurements using radioactive krypton can give information regarding the clean-up rate of this particular gas under certain conditions, and also enable a comparison to be made of the ability of different discharge conditions to clean-up rare gases. Two techniques have been used to monitor the ...
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Physics and chemistry of minerals 27 (1999), S. 133-137 
    ISSN: 1432-2021
    Keywords: Key words Diffusion ; Grain boundary ; Impurities ; Pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract We present the results of atomistic simulations to calculate the effect of impurities on vacancy migration at the {4 1 0} tilt grain boundary of MgO. We show that impurities within the mantle could significantly modify vacancy migration within the mantle due to segregation to grain boundaries. This segregation increases with increasing impurity size and with increasing pressure. The impurities have little effect on vacancy migration at 0 GPa but at higher pressures the impurities alter the activation energies such that the vacancies prefer to migrate towards them. This suggests that at mantle conditions the vacancies will be pinned both by the compression of the boundary and also the impurities, slowing diffusion.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 119 (1977), S. 63-72 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The anterior and posterior proprioceptors at the tibio-metatarsal joint of the cribellate spiderCiniflo have been studied physiologically by recording from the individual receptor nerves in response to manipulation of the metatarsus. In the anterior organ (TMant) two flexion sensitive movement units, an extension sensitive position unit and a flexion sensitive position unit were identified (Figs. 2 and 3). In the posterior organ (TMpost) there are more units present, with representatives of the above categories and also some indication of an extension sensitive movement unit (Fig. 6). The results are compared with those of the corresponding receptors in crustaceans.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 585-585 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Measurements of the electric field at ground level, and of the electric current from the air to ground, have been made at Zaria during the present Harmattan season. During fair weather conditions there is a positive electric field perpendicular to the surface at any position on the ground, normally ...
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  • 6
    facet.materialart.
    Unknown
    London : Periodicals Archive Online (PAO)
    Contributions to Political Economy. 1 (1982:Mar.) 25 
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  • 7
    facet.materialart.
    Unknown
    London : Periodicals Archive Online (PAO)
    Contributions to Political Economy. 1 (1982:Mar.) 25 
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 119 (1977), S. 55-62 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The curved, blunt-tipped hairs on the legs ofCiniflo have a structure characteristic of contact chemoreceptors. Using a ‘hair tip’ recording technique, it has been possible to confirm that these sensilla do respond to contact stimulation by certain chemical substances (Figs. 1 and 3). A few experiments were also performed onTegenaria (Fig. 2). So far, positive responses to some monavalent salts (Figs. 1 and 2) and hydrochloric acid (Fig. 3) have been established, involving perhaps 5 to 6 chemoreceptor units in all. However, each sensillum is known to have 19 chemoreceptor cells and thus most of the reaction spectrum of the sensillum remains unknown. The suggestion that, in contrast to insect contact chemoreceptors (which usually have only 4–7 sensory units), some of the dendrites may be very specific receptor units and are perhaps involved in the detection of contact pheromones or other equally specific substances, is discussed.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 119 (1977), S. 37-54 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The electrophysiological responses to mechanical stimulation of the four commonly occurring types of hair sensilla on the legs of the cribellate spiderCiniflo are described. The long, straight ‘tactile’ hairs respond preferentially to depression with activity from two phasic receptor units, one of which is sensitive to higher movement velocities than the other (Fig. 3). The units innervating the large spines respond only during erection. There is a fast adapting phasic unit and a slower adapting phaso-tonic unit (Figs. 4 and 5). It is suggested that these spines may serve partly as haemocoelic pressure monitors. The delicate trichobothria respond to small movements in all directions with directional responses from three phasic units, and are the only hairs showing true, directional sensitivity (Figs. 9, 10 and 11). The curved, blunt-tipped ‘chemoreceptive’ hairs show activity from one phasic unit when the hair is deflected in any direction away from its rest position (Fig. 8). In all cases, the number of physiologically detectable cells is one less than has been shown to be present ultrastructurally. The possible significance of these observations in relation to general araneid behaviour is discussed.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 47 (1988), S. 239-248 
    ISSN: 1570-7458
    Keywords: Mediterranean fruit fly ; Ceratitis capitata ; mating activity ; courtship ; genetics ; startle activity ; quality control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Aucune variation significative n'a été observée dans les activités sexuelles de huit souches de laboratoire de la mouche méditerranéenne du fruit, Ceratitis capitata (Wiedemann) (Diptera Tephritidae). Deux méthodes ont été utilisées pour sélectionner des souches manifestant une activité sexuelle basse ou élevée: une technique utilisant un seul couple (SP), basée sur la durée de la période avant copulation, et une technique de masse (M), basée sur un ‘index d'accouplement’. Des appariements réciproques entre les lignées rapides et lentes ont montré que la différence entre les lignées SP était déterminée par les femelles, tandis que la différence entre les lignées M résultait du comportement des deux sexes. La sélection M, quelle que soit sa direction, affects deux paramètres, la ‘distance entre partenaires lors de la vibration’ et la ‘durée de la vibration’ qui tous deux tendent à se raccourcir. La sélection M est aussi associée à une réduction de la réaction des femelles à un brusque stimulus lumineux (‘Startle activity’).
    Notes: Abstract No significant variation in mating activity was observed among eight laboratory strains of the Mediterranean fruit fly (medfly), Ceratitis capitata (Wiedemann) (Diptera: Tephritidae). Two methods were used to select strains showing high and low mating activity: a single pair technique (SP) assessing ‘time to mating’ and a mass technique (M) based on a ‘mating index’. Reciprocal pairings between fast and slow selected lines showed that the difference between the SP lines was female-determined whereas the difference between the M lines depended on the behaviour of both sexes. M selection, irrespective of its direction, affected two courtship parameters, ‘vibration distance’ and ‘vibration duration’ both of which tended to be shorter. M selection was also associated with a reduction in ‘startle activity’ in females.
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