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- 저자 : Ashall, Christopher (검색결과 2 건)
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Susceptibility status of larval Aedes aegypti mosquitoes in the Western Region of Saudi Arabia
Al Nazawi Ashwaq M.,Ashall Simon,Weetman David 한국곤충학회 2021 Entomological Research Vol.51 No.8
Vector control programs worldwide are facing the challenge of mosquitoes becoming resistant to available insecticides. Larviciding is a crucial preventative measure for dengue control but data on insecticide resistance of larval Aedes aegypti in the Middle East Region are limited. This study assesses the susceptibility status of Ae. aegypti collected from the two most important dengue foci in Saudi Arabia, Jeddah and Makkah, to important chemical and biological larvicides; the organophosphate temephos and Bacillus thuringiensis israelensis, Bti). Whilst worldwide, and particularly in Latin America, high-level resistance to temephos is common, Jeddah and Makkah populations exhibited full susceptibility to both temephos and Bti. Larval bioassays did not detect resistance in Makkah and Jeddah to temephos or Bti where a resistance ratio <5 compared to the New Orleans susceptible strain. These data suggest each can be considered by vector control programs for preventative dengue control in the region, as part of temporal rotations or spatial mosaics to manage insecticide resistance. Larval bioassays did not detect resistance in either Makkah or Jeddah to temephos or Bti (all resistance ratios <5 compared to a standard susceptible strain.
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Bose, Subhash,Dong, Subo,Pastorello, A.,Filippenko, Alexei V.,Kochanek, C. S.,Mauerhan, Jon,Romero-Cañ,izales, C.,Brink, Thomas G.,Chen, Ping,Prieto, J. L.,Post, R.,Ashall, Christopher,Grupe, Di American Astronomical Society 2018 The Astrophysical journal Vol.853 No.1
<P>Hydrogen-poor superluminous supernovae (SLSNe-I) have been predominantly found in low-metallicity, star-forming dwarf galaxies. Here we identify Gaia17biu/SN 2017egm as an SLSN-I occurring in a 'normal' spiral galaxy (NGC 3191) in terms of stellar mass (several times 10(10) M-circle dot) and metallicity (roughly solar). At redshift z = 0.031, Gaia17biu is also the lowest-redshift SLSN-I to date, and the absence of a larger population of SLSNe-I in dwarf galaxies of similar redshift suggests that metallicity is likely less important to the production of SLSNe-I than previously believed. With the smallest distance and highest apparent brightness for an SLSN-I, we are able to study Gaia17biu in unprecedented detail. Its pre-peak near-ultraviolet to optical color is similar to that of Gaia16apd and among the bluest observed for an SLSN-I, while its peak luminosity (M-g = -21 mag) is substantially lower than that of Gaia16apd. Thanks to the high signal-to-noise ratios of our spectra, we identify several new spectroscopic features that may help to probe the properties of these enigmatic explosions. We detect polarization at the similar to 0.5% level that is not strongly dependent on wavelength, suggesting a modest, global departure from spherical symmetry. In addition, we put the tightest upper limit yet on the radio luminosity of an SLSN-I with < 5.4 x 10(26) erg s(-1) Hz(-1) at 10 GHz, which is almost a factor of 40 better than previous upper limits and one of the few measured at an early stage in the evolution of an SLSN-I. This limit largely rules out an association of this SLSN-I with known populations of gamma-ray-burst-like central engines.</P>
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