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  • 1
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    Unknown
    Transmission of Oropouche virus from man to hamster by the midge Culicoides paraensis (1982)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1982-03-05
    Description: Oropouche virus (arbovirus family Bunyaviridae, Simbu serological group) was experimentally transmitted from man to hamster by the bite of the midge Culicoides paraensis. Infection rates and transmission rates were determined after the midge had engorged on patients with viremia. The threshold titer necessary to enable infection or transmission by the midges was approximately 5.3 log10 of the median lethal dose of the virus in suckling mice per milliliter of blood. Transmission was achieved 6 to 12 days after C. paraensis had taken the infective blood meal. This represents conclusive evidence of transmission of an arbovirus of public health importance to man by a member of the Ceratopogonidae family.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pinheiro, F P -- Travassos da Rosa, A P -- Gomes, M L -- LeDuc, J W -- Hoch, A L -- New York, N.Y. -- Science. 1982 Mar 5;215(4537):1251-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6800036" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bunyaviridae/*physiology ; Bunyaviridae Infections/*transmission ; Ceratopogonidae/*microbiology ; Cricetinae ; Disease Models, Animal ; Humans ; Insect Vectors/*microbiology ; Simbu virus/*physiology
    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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    PAPER CURRENT
  • 2
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    A refracting radio telescope (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Observations of extraterrestrial radio sources at the lower end of the radio frequency spectrum are limited by reflection of waves from the topside ionosphere and by the large size of antenna apertures necessary for the realization of narrow beamwidths. The use of the ionosphere as a lens is considered. The lens is formed by the release of chemicals such as H2 and H2O at the F2-layer peak. These chemicals promote dissociative recombination of O(+) in the ionosphere resulting in a local reduction in plasma density. Gradients in electron density in the vicinity of the gas release tend to focus rays propagating through the depleted region. Preliminary calculations indicate that a lens capable of focusing cosmic radio waves in the 1 to 10 MHz frequency range may be produced by the release of 100 kg of H2 at the peak of the nighttime F layer. The beamwidth of a refracting radio telescope using this lens may be less than 1/5 degree.
    Keywords: ASTRONOMY
    Type: Radio Science; 12; Mar
    Format: text
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    NASA TECHNICAL REPORTS
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