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  • Electronic Resource  (6)
  • 2005-2009
  • 1980-1984  (6)
  • 1935-1939
  • Coleoptera  (2)
  • Hippocampus  (2)
  • Ankylosing spondylitis  (1)
  • Bicycle ergometer  (1)
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  • Electronic Resource  (6)
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Population studies of leukocyte-reactive antinuclear antibody and HLA antigens (1981)
    Springer
    Rheumatology international 1 (1981), S. 103-105 
    Details
    ISSN: 1437-160X
    Keywords: Leukocyte-reactive ANA ; HLA ; Ankylosing spondylitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The prevalence of serum leukocyte-reactive antinuclear antibody (LR-ANA) was determined in 31 patients with ankylosing spondylitis (AS), their age-and gender-matched normal controls, and two tribes of 340 West Coast Canadian Indians (Bella Coolas and Haidas). At a serum dilution of 1:10, the prevalence of LR-ANA in AS and controls was 45% and 7%, respectively. At 1:20 dilution, the prevalence was 23% in AS, 0% in controls, 29% in Bella Coolas and 27% in Haidas. No concordance was found among LR-ANA, HLA-B27 and CREG-B7, and nine HLA-A and seven HLA-B antigens in the Indian tribes. These studies confirm an increased prevalence of LR-ANA in AS and AS kindreds. but the latter association appears to be independent of HLA antigens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541252
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Medial septal projections to the dentate gyrus of the rat: electrophysiological analysis of distribution and plasticity (1984)
    Springer
    Experimental brain research 56 (1984), S. 243-256 
    Details
    ISSN: 1432-1106
    Keywords: Medial septum ; Hippocampus ; Dentate gyrus ; Evoked potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Previous electrophysiological experiments in rabbits have suggested that medial septal stimulation activates dentate granule cells and evokes an associated negative field response at the granule cell layer, without an associated “dendritic” response. Anatomical studies have suggested that septal input to the granule cells may be to stratum moleculare, or close to the cell layer, or may not exist at all. The present experiments confirmed in rats anaesthetised with urethane that medial septal stimulation elicits single action potentials from cells in the granule layer. The associated negative field potential was maximal in the granule cell layer and there was no sign of a separate dendritic potential. The fibres responsible for this potential travel to the dorsal hippocampus in the fornix superior rather than the fimbria, taking the same course as the fibres which contribute to the dense cholinesterase staining just above the granule cell layer. Stimulation at 100 Hz for 1 s of either medial septal, or perforant path, input to the dentate granule cell layer produced long term potentiation of the subsequent evoked field responses to the stimulated pathway. The responses to the non-stimulated pathway were unchanged. Paired pulse stimulation produced both homosynaptic and heterosynaptic potentiation. These data suggest that medial septal input synapses close to granule cell bodies and produces a negative field potential which is a combination of dendritic and population spike potentials. Medial septal input also appeared to produce direct activation of hilar neurones, some of which may be basket cells or other interneurones. The data also show that long term potentiation is specific to this input, perhaps dependent on presynaptic mechanisms. Paired pulse potentiation, at least in the heterosynaptic case appears to depend on postsynaptic mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236280
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ephaptic interactions contribute to paired pulse and frequency potentiation of hippocampal field potentials (1984)
    Springer
    Experimental brain research 54 (1984), S. 567-570 
    Details
    ISSN: 1432-1106
    Keywords: Hippocampus ; Frequency potentiation ; Transmembrane potential ; Ephaptic transmission
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The contribution of ephaptic interactions to potentiation of the hippocampal CA1 extracellular population spike during paired pulse or frequency stimulation of stratum radiatum (SR) inputs was investigated using the in vitro hippocampal slice preparation. Records of the transmembrane potential revealed a depolarizing wave with an amplitude and latency that varied directly with that of the extracellular population spike. Paired pulse or repetitive stimulation of SR resulted in a potentiation of the population spike amplitude and a corresponding increase in the amplitude of the TMP depolarizing wave. Action potentials generated during the stimulus train consistently arose from the peak of the depolarizing wave. It is proposed that ephaptic interactions contribute to potentiation of the extracellular population spike through recruitment of subthreshold neurons within the population during repetitive afferent stimulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235482
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  • 4
    Electronic Resource
    Electronic Resource
    Specificity of the anaerobic threshold in endurance trained cyclists and runners (1981)
    Springer
    European journal of applied physiology 47 (1981), S. 93-104 
    Details
    ISSN: 1439-6327
    Keywords: $$\dot V$$ O2 max ; Anaerobic threshold ; Bicycle ergometer ; Treadmill
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study examined the specificity of maximum aerobic power and the anaerobic threshold (AT) in 10 endurance-trained cyclists and 10 endurance-trained runners who performed continuous progressive work tests on the bicycle ergometer and treadmill. Dependent ‘t’ tests for $$\dot V$$ O2 max l/min−1 indicated that the cyclists scored higher on the bicycle ergometer ( $$\bar X$$ =4.5 l/min−1) than the treadmill ( $$\bar X$$ =4.34 l/min−1) but the difference was not statistically significant. By contrast, the runners fared significantly better (p〈0.05) on the treadmill ( $$\bar X$$ =68.1 ml/kg·min−1) compared with the bicycle ergometer ( $$\bar X$$ =61.7 ml/kg·min−1). When the AT was expressed as a percentage of $$\dot V$$ O2 max, there were no significant differences between the cyclists (66.3%) and runners (61.2%) on the bicycle ergometer or the runners (77.3%) and cyclists (74.3%) on the treadmill. However, this tendency for the better score to be registered by the group tested on the activity for which it trained was most pronounced when the AT was expressed in l/min−1 and ml/kg·min−1·Independent ‘t’ tests accordingly indicated that the cyclists (3.0 l/min−1) had significantly (p〈0.05) greater AT's than the runners (2.56 l/min−1) on the bicycle ergometer whereas the runners (52.7 ml/kg·min−1) had significantly (p〈0.05) higher AT's than the cyclists (46.8 ml/kg·min−1) on the treadmill. These data suggest that the adaptive responses to exercise are in part a function of the specific movement patterns executed in training. Thus, if $$\dot V$$ O2 max and the AT are to be measured in the laboratory, the tests must allow optimal innervation of the specifically trained muscle fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00422487
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Influence of chemically mediated behavior on host tree colonization by four cohabiting species of bark beetles (1980)
    Springer
    Journal of chemical ecology 6 (1980), S. 395-414 
    Details
    ISSN: 1573-1561
    Keywords: Coleoptera ; Scolytidae ; bark beetle ; Dendrocionus ; Ips ; pheromone ; colonization ; attraction ; inhibition ; behavioral interaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Chemically mediated behavioral interactions among four species of Scolytidae cohabitingPinus taeda in east Texas appear to be significant in delineating breeding areas within trees and in influencing the sequence of colonization.Dendroctonus frontalis usually arrived first and was not attracted to logs occupied by any of the threeIps species (I. avulsus, I. calligraphus, andI. grandicollis). The response ofI. avulsus to conspecific males was enhanced by the simultaneous presence of actively boring maleI. grandicollis. The response ofIps calligraphus was inhibited in areas whereI. avulsus was also present, but, in turn,I. calligraphus inhibited the response ofI. grandicollis and attractedI. avulsus. Ips grandicollis was strongly inhibited by the simultaneous presence of femaleD. frontalis or maleI. calligraphus, and in turn, maleI. grandicollis inhibitedD. frontalis. The result of this highly interactive olfactory system is that host trees are colonized very rapidly and that, in the process, disadvantageous reproductive interactions are minimized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402917
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of two attempts to trap defined populations ofScolytus multistriatus (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 125-136 
    Details
    ISSN: 1573-1561
    Keywords: Aggregation ; pheromone ; elm ; mark-release ; multilure ; Coleoptera ; Scolytidae ; Scolytus multistriatus ; trap-out ; Ulmus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Two experiments were conducted to investigate the use of a pheromone-based trap-out technique for suppressing populations ofScolytus multistriatus. In the first experiment, elm bolts containing the immature stages ofS. multistriatus were placed in an isolated community that contained elm trees, but which was essentially devoid of a resident beetle population. The infested bolts produced a total of 46,485 adult beetles of which 20% were recovered on traps baited with synthetic pheromone. In the second experiment beetles were released in a desert valley containing no resident elms or beetles. Only 1% of 20,000 released beetles were recaptured on traps erected on vertical cardboard cylinders and on elm logs. These rates of recapture are related to the attraction of beetles to naturally occurring brood sources versus pheromone-baited traps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984010
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    Paper (German National Licenses)
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