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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 27 (1955), S. 1058-1061 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 29 (1957), S. 954-957 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 94 (1987), S. 211-218 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The behaviour of 16 adult (8 male and 8 female) spanner crabs (Ranina ranina), collected off southern Queensland, Australia, was monitored continuously in captivity by closed-circuit television for fifteen months from September 1982. Spanner crabs spent most of the time buried in the substrate, emerging mainly only when food became available. They remained emerged for twice as long on feeding days as on days without food. Females responded significantly faster than males to the presence of food. Response was slowest in October and November. There was no correlation between temperature and response time. The average feeding time was 2.0 min (SE=0.12), with no significant difference between males and females. Crabs without food were aggressive towards crabs with food, which sometimes led to fighting and wounding. These interactions also could result in food being transferred from one individual to another. When males interacted, food was transferred more often than when either females, or males and females interacted. Around moulting, male crabs did not feed for 52 d (SE=9.0) and females for 22 d (SE=2.2). This habit would reduce the frequency with which newly moulted crabs are caught in the baited tangle nets used by commercial fishermen. In mating interactions, copulation was always initiated by the males. Males dug up other crabs but, apparently unable to distinguish the sex of these individuals, attempted copulation with either sex. The majority of copulations occurred between midday and midnight and in the period August to December. The frequency of copulations with a female increased 10 d before she extruded eggs, after which it dropped to zero for the following 41 to 50 d. Eggs were carried for 39 to 44 d in the period September to November. The females remained emerged for long periods before extruding their eggs, but the period shortened immediately afterwards. This behaviour would lead to low catchability of ovigerous females. Because females respond more rapidly than males to a food stimulus, they may be more catchable in baited nets than are males. It is concluded that seasonal changes in the behaviour of spanner crabs could affect the number caught by baited tangle nets and may influence the sex ratio in catches.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4491-4500 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effects of domain structure on the low-frequency conductivity response of a polymer electrolyte having low carrier concentration are investigated by modeling the domains as spheres. For zero leakage (no dc conductivity), the diffusion equation is solved exactly. The results are also extended approximately to the case of small but nonzero leakage by imposing physically reasonable approximate boundary conditions together with an ad hoc procedure for treating the diffusion in the less conductive exterior. Interaction between charge carriers in different domains is taken into account in the Maxwell–Garnet approximation and found to have only a small effect for physically reasonable parameter values. The predicted diffusive behavior is studied and the results are applied to examine the predicted behavior of the frequency-dependent conductivity.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Accident Analysis and Prevention 16 (1984), S. 247-261 
    ISSN: 0001-4575
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Architecture, Civil Engineering, Surveying , Psychology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Medicine 32 (1981), S. 543-557 
    ISSN: 0066-4219
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 2785-2797 
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The destruction of negative ions by laser photodetachment suddenly modifies the electron and negative ion densities in a localized region. The subsequent recovery of negative ion density n−(t) may be measured with a second photodetaching laser pulse. These measurements, compared with a ballistic model for n−(t), are the basis of a negative ion temperature diagnostic, which is being developed and employed in H− and D− sources. In this paper the accompanying plasma potential perturbation and its effect on the negative ion response is discussed. The perturbation can introduce an error in negative ion temperature measurements. Late in time, the negative ion density is observed to recover more slowly than indicated by the ballistic theory. An intriguing mechanism is proposed for the late slow recovery of negative ion density, based on a small lingering potential perturbation and a hole in negative ion velocity space. These different theoretical approaches are illustrated with a detailed analysis of an example case from a hydrogen discharge.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2721-2728 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report the results of simulating two multicusp volume negative ion sources in which plasma parameters, hydrogen vibrational spectra, and in one case the negative ion density, have been measured. We find generally good quantitative and qualitative agreement between experiment and theory for the basic discharge parameters. Good agreement is also found for atomic density, although the wall recombination coefficient γ(H) is 0.05 in one source and 0.5 in the other. The calculated densities of vibrationally excited states with v‘≥5 are higher than the measured densities, but the calculated negative ion densities are lower than available measurements. Possible causes for these discrepancies are suggested. Fundamental modifications to the model may be necessary, and we have discussed two possibilities: a suprathermal rotational spectrum, and a spatial gradient in vibrational excitation (due to elastic collisions which can localize the effect of vibrational wall cooling near the wall).
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Cambridge : Cambridge University Press
    Greece and Rome 25 (1978), S. 55-58 
    ISSN: 0017-3835
    Source: Cambridge Journals Digital Archives
    Topics: Archaeology , Classical Studies
    Notes: The celebrated trick with the arrow and the axes, described in the twenty-first book of the Odyssey, has been extensively discussed; but there is little agreement on how, if at all, it was performed. We report here an attempt at a practical reconstruction.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Journal of neuroendocrinology 17 (2005), S. 0 
    ISSN: 1365-2826
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Oestrogen powerfully affects the secretion of gonadotropin-releasing hormone (GnRH) from the brain in all species investigated, including sheep. Until recently, it was hypothesised that such regulation occurs indirectly because few or no GnRH neurones were found to express oestrogen receptor (ER) α. The discovery of a second oestrogen receptor, ERβ, and its subsequent localisation in numerous GnRH neurones in the rat, led to a reconsideration of this hypothesis. However, colocalisation of immunoreactive ERβ protein in GnRH neurones has only been demonstrated in the rat, raising the possibility that such putative direct regulation of GnRH neurones by oestrogen may be peculiar to this species. We have previously shown that steroid receptors in the sheep brain are acutely sensitive to fixation and the full complement of immunoreactive cells can only be visualised after antigen retrieval. The aims of this study were therefore to map immunocytochemically the distribution of ERβ neurones in the ewe brain, and to determine which proportion of GnRH neurones express ERβ. Brain sections (20 µm) from four ewes killed in anestrus were subjected to high temperature antigen retrieval and immunocytochemistry. Numerous ERβ-immunoreactive cells were located throughout the hypothalamus and, following dual-label immunocytochemistry, over 50% of the GnRH neurones were found to express immunoreactive ERβ. The functional significance of these ERβ-expressing GnRH neurones in the ovine brain remains to be determined.
    Type of Medium: Electronic Resource
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