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  • 1
    Electronic Resource
    Electronic Resource
    Life-cycle and changes in carbohydrates, proteins and lipids of Pentapedilum uncinatum Goet. (Diptera; Chironomidae) (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 8 (1978), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. The life cycle of Pentapedilum uncinatum in the Tjeukemeer is briefly described. There are two generations of larvae per year in the mud substrate but only one generation per year in the sand substrate. Changes in chemical composition during the life cycle of P. uncinatum are described, and the data indicate that such changes are not synchronized with particular larval instars but follow a predetermined development pattern for the production of an adult insect. Development appears to be the same in both male and female larvae which results in adult insects that have almost identical percentage composition of chemical substances, but proportionately greater growth in female larvae gives an adult insect that is almost twice as heavy as the male.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1978.tb01433.x
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  • 2
    Electronic Resource
    Electronic Resource
    A modification of the Ekman-Birge bottom sampler for heavy duty (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 9 (1979), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1979.tb01500.x
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence of the 3.3-µm feature in galaxies (1982)
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 214-215 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mechanism that produces the line is thought to be due either to fluorescence of the grains in a UV radiation field10 (but this requires very high efficiencies) or to the heating of very small grains to high temperatures (several hundred degrees)11. The presence of the feature in extragalactic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/295214a0
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  • 4
    Electronic Resource
    Electronic Resource
    Baclofen: reduction of presynaptic calcium influx in the cat spinal cord in vivo (1997)
    Springer
    Experimental brain research 113 (1997), S. 520-533 
    Details
    ISSN: 1432-1106
    Keywords: Key words Spinal Ia terminations ; Action potentials ; Baclofen ; Calcium influx ; Cat ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  In the ventral horn of the lumbar spinal cord of cats anaesthetised with pentobarbitone sodium, microelectrophoretically administered (–)-baclofen, but not (+)-baclofen, reversibly reduced the duration of the orthodromic action potential of muscle group Ia afferent terminations, but not those of muscle group I afferent myelinated fibres. The presumably submicromolar concentrations are already known to reversibly reduce excitatory transmitter release from muscle group Ia afferent terminations. Action potential durations were estimated from threshold recovery curves after an orthodromic impulse using an extracellular microstimulation technique. Both of these presynaptic effects of (–)-baclofen were blocked by baclofen antagonists, and neither appeared to be reduced by the potassium channel blocking agents tetraethylammonium and 4-aminopyridine. Tetraethylammonium and 4-aminopyridine also did not significantly modify the reduction by (–)-baclofen of monosynaptic field potentials in the lumbar cord of rats anaesthetised with pentobarbitone sodium. In the cat the maximum reduction by (–)-baclofen of termination action potentials was considerably less than that produced by cadmium ions, which, unlike (–)-baclofen, also reduced the action potential duration of group I myelinated fibres. These findings are consistent with a reduction by (–)-baclofen of the influx of calcium through voltage-activated channels in the membrane of group Ia terminations, a proposal which also accounts for the reduction by (–)-baclofen of the release of GABA at axo-axonic depolarizing synapses on these terminations. The results are discussed in relation to the mode of action of (–)-baclofen and the different sensitivities of transmitter release at various central synapses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00005604
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  • 5
    Electronic Resource
    Electronic Resource
    An in vivo electrophysiological investigation of group Ia afferent fibres and ventral horn terminations in the cat spinal cord (1995)
    Springer
    Experimental brain research 106 (1995), S. 403-417 
    Details
    ISSN: 1432-1106
    Keywords: Spinal Ia terminations ; Myelinated fibres ; Action potentials ; Primary afferent depolarization ; Transmitter release ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An extracellular microstimulation technique has been used to investigate and compare the properties of group I primary afferent myelinated fibres in the dorsal column and group Ia unmyelinated terminations in the lumbar spinal cord of cats anaesthetised with pentobarbitone sodium. Fibres were distinguished from terminations on the basis of location, anodic blocking factor and sensitivity to GABAA mimetics. The recovery curves of threshold following an orthodromic impulse provided an estimate of both action potential duration and rate of repolarization. The action potentials of group Ia terminations were of briefer duration (by a factor of approximately 2) with more rapid rates of repolarization (factor of approximately 3) than those of the myelinated fibres. The prolongation of termination but not fibre action potentials by microelectrophoretic tetraethylammonium and 4-aminopyridine indicated the presence of voltage-activated potassium channels in the termination membrane. Differences in the effects on Ia termination action potentials of depolarizations (reductions in threshold) associated with a preceding action potential, synaptically released GABA, microelectrophoretic piperidine-4-sulphonic acid or dl-homocysteic acid suggest that an increase in termination membrane conductance is the major factor in the reduction of transmitter release during the activation of presynaptic GABAA receptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231063
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  • 6
    Electronic Resource
    Electronic Resource
    An introduction to the limnology of the Friesian lakes (1978)
    Springer
    Hydrobiologia 58 (1978), S. 49-64 
    Details
    ISSN: 1573-5117
    Keywords: Comparison of lakes ; The Netherlands ; Friesland
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Between November 1970 and November 1972 nine sampling trips were carried out in the Friesian Lake District. Fourteen lakes were sampled. The chemical composition of the lake water, chlorophyll-a content and the species composition and population densities of zooplankton and benthos were determined simultaneously. Results are discussed in relation to the hydrology of the Lakes system and the morphometry of the individual lakes. The lakes showed a high degree of similarity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018895
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations into the occurrence of midge plagues in the vicinity of Harderwijk (Netherlands) (1981)
    Springer
    Hydrobiologia 80 (1981), S. 147-159 
    Details
    ISSN: 1573-5117
    Keywords: insect abundance ; chironomids ; larval distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Between February and October 1977 a study was made of the total chironomid larval population in Wolderwijd, a large, shallow Dutch lake. The main species distribution pattern was, according to substrate and total larval population size, of the same order of magnitude in both substrates. Eutrophication did not cause extraordinarily large chironomid populations to produce excessive numbers of adult midges. The midge plagues experienced in the area are ascribed to the attraction of the midges for artificial light displayed by housing estates in the neighbourhood of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008433
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  • 8
    Electronic Resource
    Electronic Resource
    Distribution and production of the larval chironomid populations in Tjeukemeer (1982)
    Springer
    Hydrobiologia 95 (1982), S. 287-306 
    Details
    ISSN: 1573-5117
    Keywords: chironomids ; larval populations ; distribution ; production ; shallow lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution and production of larval chironomids in Tjeukemeer, a shallow, moderately large and wind exposed lake, were estimated between 1969 and 1972. The following seven species together contributed more than 95% of all the individuals collected: Chironomus anthracinus, Chironomus plumosus, Cladotanytarsus mancus, Glyptotendipes pallens, Polypedilum nubeculosum, Polypedilum scalaenum and Stictochironomus histrio. Density and biomass distribution depended generally on the substrate type and its stability. The standing crop biomass was highest in the reed-beds and in a narrow 100 m wide inshore zone and low in the large offshore zone. Wind induced wave action, causing substrate instability, is likely to be the main factor responsible for these low standing crops. The mean annual larval production in the lake was: 1969, 1.8; 1970, 0.4; 1971, 1.7 and 1972, 3.7 g dry wt m−2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044490
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  • 9
    Electronic Resource
    Electronic Resource
    Letters to the Editor (1979)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 384-384 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690250234
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  • 10
    Electronic Resource
    Electronic Resource
    Letters to the editor (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 959-960 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220536
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