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  • 1
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    Amblyomma americanum: a potential vector of Lyme disease in New Jersey (1984)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1984-05-11
    Description: Amblyomma americanum is a likely secondary vector of Lyme disease in New Jersey. Ticks of this species were removed from the site of the characteristic skin lesion known as erythema chronicum migrans on two patients with the disease, and the Lyme disease spirochete was isolated from nymphs and adults of this species. That A. americanum is a potential vector is supported by its similarities to Ixodes dammini, the known tick vector, in seasonal distribution and host utilization. The extensive range of A. americanum may have great implications for potential Lyme disease transmission outside known endemic areas.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schulze, T L -- Bowen, G S -- Bosler, E M -- Lakat, M F -- Parkin, W E -- Altman, R -- Ormiston, B G -- Shisler, J K -- New York, N.Y. -- Science. 1984 May 11;224(4649):601-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6710158" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Aged ; Animals ; Arachnid Vectors/*microbiology ; Arthritis, Infectious/microbiology/*transmission ; Female ; Humans ; Male ; New Jersey ; Spirochaetales Infections/transmission ; Ticks/*microbiology
    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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    Filament formation in wind-cloud interactions - I. Spherical clouds in uniform magnetic fields (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-14
    Description: Filamentary structures are ubiquitous in the interstellar medium, yet their formation, internal structure, and longevity have not been studied in detail. We report the results from a comprehensive numerical study that investigates the characteristics, formation, and evolution of filaments arising from magnetohydrodynamic interactions between supersonic winds and dense clouds. Here, we improve on previous simulations by utilizing sharper density contrasts and higher numerical resolutions. By following multiple density tracers, we find that material in the envelopes of the clouds is removed and deposited downstream to form filamentary tails, while the cores of the clouds serve as footpoints and late-stage outer layers of these tails. Aspect ratios 12, subsonic velocity dispersions ~0.1–0.3 of the wind sound speed, and magnetic field amplifications ~100 are found to be characteristic of these filaments. We also report the effects of different magnetic field strengths and orientations. The magnetic field strength regulates vorticity production: sinuous filamentary towers arise in non-magnetic environments, while strong magnetic fields inhibit small-scale perturbations at boundary layers making tails less turbulent. Magnetic field components aligned with the direction of the flow favour the formation of pressure-confined flux ropes inside the tails, whilst transverse components tend to form current sheets. Softening the equation of state to nearly isothermal leads to suppression of dynamical instabilities and further collimation of the tail. Towards the final stages of the evolution, we find that small cloudlets and distorted filaments survive the break-up of the clouds and become entrained in the winds, reaching velocities ~0.1 of the wind speed.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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