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  • 1
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    International congress of entomology (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-10-19
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, J R -- Doyen, J T -- Hoy, M A -- Koehler, C -- Pipa, R L -- Andres, L A -- Haverty, M I -- Hoy, J B -- Knop, N F -- Ehrlich, P R -- Greenstone, M -- Plapp, F W Jr -- Shuping, Y -- New York, N.Y. -- Science. 1990 Oct 19;250(4979):360.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17793005" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Regulatory role of parasites: impact on host population shifts with resource availability (1991)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1991-07-12
    Description: Effects of infections by the ciliate Lambornella clarki on larval populations of its mosquito host Aedes sierrensis were examined in laboratory and field studies. When host populations developed with sufficient food, mortality from parasites was additive and reduced the number of emerging mosquitoes. For food-limited populations, mortality was compensatory or depensatory; emerging adults were as or more abundant with higher average fitness than those from uninfected control populations. When nutrients were scarce, parasitic infections relaxed larval competition and increased per capita food by reducing host abundance. Food limitation altered larval feeding behavior, reducing horizontal transmission and subsequent mortality from parasitism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Washburn, J O -- Mercer, D R -- Anderson, J R -- AI20245/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1991 Jul 12;253(5016):185-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Entomology, University of California, Berkeley 94720.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1906637" target="_blank"〉PubMed〈/a〉
    Keywords: Aedes/*parasitology/physiology ; Animals ; Ciliophora/*physiology ; Ecology ; Population Dynamics ; Trees
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Nature and activity of some vanadium catalysts (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 1032-1041 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100107a010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Vanadium-containing ZSM5 zeolites: reaction between vanadyl trichloride and ZSM5/silicalite (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 3306-3310 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100161a063
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  • 5
    Electronic Resource
    Electronic Resource
    Intercalation of montmorillonite with individual chromium(III) hydrolytic oligomers (1992)
    s.l. : American Chemical Society
    Inorganic chemistry 31 (1992), S. 4894-4897 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00049a033
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  • 6
    Electronic Resource
    Electronic Resource
    Mating behavior and thermoregulation of the reindeer warble fly,Hypoderma tarandi L. (Diptera: Oestridae) (1994)
    Springer
    Journal of insect behavior 7 (1994), S. 679-706 
    Details
    ISSN: 1572-8889
    Keywords: Hypoderma tarandi ; reindeer warble fly ; mating behavior ; thermoregulatory behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hypoderma (=Oedemagena) tarandi L. (Diptera: Oestridae) is characterized by a mating strategy in which both sexes meet and mate at two types of distinct topographical landmarks. In the expansive, treeless vidda (= tundra-like) biome, mating places are unique, rocky areas located along rivers and streams or in rocky areas of drying river and stream beds. In wooded valleys below the vidda, flies mated at certain topographical areas along dirt road tracks/paths. Thermoregulatory activities of males occupying perches at mating places included selection of substratum at perch site, orientation of body to sun's rays, crouching, stilting, and flights into upper cooler air. On warm sunny days males perched for just 1–2 min before flying up into cooler air to promote cooling. Laboratory and field studies revealed that flies could not metabolically cool down when held at 25–38°C. Time spent at mating places depended on temperature, duration of sunshine, and wind velocity. Males were very aggressive in pursuing allHypoderma-sized objects that passed by them or that landed near them, but they did not defend specific perch sites. Males either pursued and caught females in flight, or they hopped onto females that landed near them. During 5 years, 74 males and 14 females were seen at mating places. Dissection of six females caught at mating places revealed them to be recently eclosed flies full of fat body and with all eggs intact; two not paired with males were non-inseminated. Three experimentally paired females remainedin copulo for 10, 13, and 19.5 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997439
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  • 7
    Electronic Resource
    Electronic Resource
    The retention of copper ions by AlPO4-5/VAPO-5 and their effect on reactant access (1992)
    Springer
    Catalysis letters 16 (1992), S. 1-9 
    Details
    ISSN: 1572-879X
    Keywords: Ion exchange ; AlPO4-5 ; VAPO-5 ; defect sites ; copper ; ESR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of copper salts with AlPO4-5 or Vv-VAPO-5 under acidic (CuCl2, pH adjusted to 2) but especially basic conditions (Cu(NH3) 4 2+ , pH adjusted to 9) gives ion incorporations greater than expected by a simple ion exchange mechanism (both AlPO4-5 and Vv-VAPO-5 could be expected to have no cation exchange capacity). Ion incorporation is proposed to occur initially at defect sites, and examination of the ESR spectrum of a dehydrated, evacuated CuCl2-exchanged AlPO4-5 shows that these defect sites give rise to a number of unique environments upon CuII incorporation. The CuCl2-exchanged VAPO-5 retains a significant toluene accessibility to the Vv sites in the VAPO-5. However, the toluene accessibility in the Cu(NH3) 4 2+ -exchanged VAPO-5 is significantly reduced and we propose this is due to a combination of the presence of crystalline CuO and structural collapse from reaction with base (NH4OH). The ability of treatment with base (NH4OH, pH ≈ 13) to restrict access of toluene to the Vv sites of the original VAPO-5 was verified in a separate experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764348
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  • 8
    Electronic Resource
    Electronic Resource
    Formation of phenazine from azobenzene over H-ZSM5: Reaction control by a molecular constrained environment (1990)
    Springer
    Catalysis letters 6 (1990), S. 59-66 
    Details
    ISSN: 1572-879X
    Keywords: Phenazine ; azobenzene ; zeolite ; reaction control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Azobenzene undergoes a unique reaction in the channels of H-ZSM5 zeolite at 593–673 K to give phenazine which is mainly retained within the zeolite. The yield of phenazine is increased by the addition to the reaction carrier gas of oxygen (1% vol.) which probably functions as a hydrogen acceptor. No reaction occurs when low acidity silicalite is used. On H-USY zeolite the yield of phenazine is low and the main product is a black, insoluble material which is probably polymeric. Benzo(c)cinnoline which is a known dehydrocyclization product from azobenzene under strongly acidic reaction conditions is never more than a trace product using H-ZSM5 or H-USY. A reaction scheme is proposed involving homolysis of the N ~ N bond in protonated trans-azobenzene, forming two radicals which, in a H-ZSM5 channel, are constrained in their mutual orientation so as to lead to the formation of phenazine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00764053
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  • 9
    Electronic Resource
    Electronic Resource
    A 3-D modelsyystem for simulating thunderstorm microburst outflows (1992)
    Springer
    Meteorology and atmospheric physics 49 (1992), S. 125-131 
    Details
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary A new three-dimensional numerical model system has been designed to study the complex near-surface flow features that arise from collisions between microburst outflow events and other sub-cloud phenomena with complex geometry. The model was designed specifically for implementation on massively parallel computers, and makes use of the high computation rates and large memory sizes of these machines to achieve spatial resolutions of 50 m or less in each dimension. Here we will report on one of the first model applications, a parameter study of colliding microburst outflows. Results from this study indicate that the collision zone between the two downdrafts can be a region of violent and complicated dynamics which can often lead to an elevated region of significant aircraft hazard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025404
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  • 10
    Electronic Resource
    Electronic Resource
    Using panel data to estimate risk effects in seemingly unrelated production functions (1992)
    Springer
    Empirical economics 17 (1992), S. 35-49 
    Details
    ISSN: 1435-8921
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract In this paper, production functions in the form of seemingly unrelated regressions (SUR) with errors that are heteroscedastic and that contain cross-section and time components are proposed. These functions are distinguished from others in that they allow the risks (indicated by variances) of outputs to change in any direction in response to input changes. The SUR are then applied in the analysis of cross-section time-series data for rice, wheat and maize production in China.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01192473
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