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  • Chemistry  (3)
  • Antipredator strategy  (1)
  • Electromagnetic flow probes  (1)
  • Extinction  (1)
  • 2000-2004
  • 1985-1989  (6)
  • 1
    Electronic Resource
    Electronic Resource
    The controlled assembly of microcosmic communities: the selective extinction hypothesis (1986)
    Springer
    Oecologia 71 (1986), S. 12-17 
    Details
    ISSN: 1432-1939
    Keywords: MacArthur ; Wilson ; Equilibrium model ; Community assembly ; Extinction ; Colonization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Forty communities were assembled through the controlled inoculation of algae, protozoans and a rotifer according to either of 2 distinct introduction schedules. These introduction schedules were constructed such that species reinvaded on average either every 6 or 8 w. Ten of the 20 beakers experiencing each invasion schedule contained 300 ml of media; the remaining beakers in each invasion category contained 100 ml of media. Species richness consistently increased throughout the initial 4 w and 7 w of the experiment for the low and high invasion rate beakers, respectively. The numbers of species in the low rate beakers were uncorrelated with time during the last half of the experiment; however, species richness gradually declined during this period in the high rate beakers. The extinction rate is shown to be disproportionately higher for large organisms in the small microcosms. Such “selective extinction” is consistent with the MacArthur-Wilson equilibrium model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377313
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  • 2
    Electronic Resource
    Electronic Resource
    Microhabitat selection as an antipredator strategy in the aquatic insect Pachydiplax longipennis Burmeister (Odonata: Libellulidae) (1987)
    Springer
    Oecologia 71 (1987), S. 185-189 
    Details
    ISSN: 1432-1939
    Keywords: Odonata ; Antipredator strategy ; Pachydiplax ; Sagittaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary An investigation of the larval dragonfly fauna associated with the plant, Sagittaria platyphylla, was conducted in a small pond. Despite the presence of several larval anisopteran species in the pond, only Pachydiplax longipennis larvae were found on Sagittaria plants. A study of the microspatial distribution of P. longipennis larvae on S. platyphylla indicated that larvae use the various regions of a plant in a highly non-random fashion. Larvae show a strong preference for the leaf axil area. A generalized predator, the bluegill sunfish (Lepomis macrochirus), was allowed to selectively eat either of two larvae placed in various plant regions. This experiment indicated that larvae in a leaf axil area were significantly less susceptible to bluegill predation than larvae positioned in other plant regions. The microspatial distribution of starved larvae revealed that larvae with high hunger levels occupied the leaf axil area significantly less than well fed larvae, suggesting 1) larvae do not use these regions as feeding sites, and 2) high hunger levels may induce a behavioral shift in habitat use, with starved larvae forced into areas of high predation risk by the need to fulfill nutritional requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00377283
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  • 3
    Electronic Resource
    Electronic Resource
    Bacterial adsorption to smooth surfaces: Rate, extent, and spatial pattern (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 27 (1985), S. 1662-1667 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The influence of bulk-water bacterial cell concentration and specific growth rate history on bacterial adsorption rates to surfaces was investigated using response surface analysis. A pure culture of Pseudomonas sp. 224S was grown in a chemostat and pumped into a continuous flow reactor where the bacteria were exposed to clean, glass surfaces under turbulent flow conditions for a period of six hours. Adsorption rate decreased approximately linearly with increasing specific growth rate history. Glass surfaces became saturated with 224S at ca. 0.1% coverage and the resulting spatial pattern of the adsorbed cells deviated from random in the direction of uniformity.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260271206
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  • 4
    Electronic Resource
    Electronic Resource
    Minimising stimulator artefacts in electromagnetic flow signals (1988)
    Springer
    Medical & biological engineering & computing 26 (1988), S. 17-19 
    Details
    ISSN: 1741-0444
    Keywords: Cardiac pacing ; Electromagnetic flow probes ; Stimulation artefact
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Simultaneous electrical stimulation of tissue with the measurement of blood flow using an electromagnetic flowmeter system almost invariably results in large flow measurement inaccuracies. These inaccuracies are because the electrical energy from stimulating artefacts is amplified along with the flow signals. The paper describes the building and use of an inexpensive circuit to remove stimulation artefacts from electromagnetic flow measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441822
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of some abnormal haemoglobins by fast atom bombardment mass spectrometry and fast atom bombardment tandem mass spectrometry (1988)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1988), S. 41-44 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The characterization of two abnormal human haemoglobins by fast atom bombardment (FAB) mapping is presented. The first variant, called ‘R’, exhibits a tryptic FAB map identical to that of normal haemoglobin. However, using Staphylococcus protease V8, a peptide containing the carboxyl end of the β-chain exhibits a mass shift down to 300 mass units. This clearly indicates the deletion of the two last amino acids of the β-chain. The second variant, called ‘Grenoble’, is due to two different modifications of the β-chain. The location of the Pro → Ser exchange on peptide T5 is achieved by the collisionally activated dissociation mass analyzed ion kinetic energy spectra of the corresponding [MH]+ ion. The m/z value of that peptide indicated a supplementary acid → amide modification, which was located by amino acid sequencing using chemical methods. This work concludes with the necessity of using complementary methods for achieving rapid determinations of abnormal proteins with minute amounts.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200160108
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  • 6
    Electronic Resource
    Electronic Resource
    The reactions of the ions [XC]+, [X2C]+·, [X3C]+· and [X4C]+· (where X = H or F) with ethene and propene (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 154-156 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of C1 ions with ethene and propene has been studied in the gas phase using a triple quadrupole mass spectrometer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220307
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