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- Anderbrant, O., et al.
(författare)
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Diprionyl esters attractive to males of the dailing pine sawfly Neodiprion dailingensis Xiao et Zhou (Hym., Diprionidae) in north-eastern China
- 1997
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Ingår i: Journal of Applied Entomology. - 0931-2048. ; 121:5, s. 281-283
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Tidskriftsartikel (refereegranskat)abstract
- The attraction of male Neodiprion dailingensis Xiao et Zhou to pheromone substances identified from other Neodiprion species was tested in plantations of Pinus tabulaeformis Carr. in Liaoning Province in north-eastern China. Both the acetate and propionate of (2S,3S,7S)-3,7-dimethyl-2-pentadecanol (diprionol) were highly attractive. An addition of 10% of the (2S,3R,7R)-isomer did not significantly reduce the catch to the acetate. The (2S,3R,7R)-isomer was not attractive by itself. This is the first pheromone study of a species belonging to the recently described East Asian group of Neodiprion. The response of N. dailingensis males is similar to that of N. sertifer males in eastern part of Asia.
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- Chu, H.S., et al.
(författare)
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VLBI observations of the puzzling BL Lacertae object 0235+164
- 1996
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Ingår i: Astronomy and Astrophysics. - : Springer. - 0004-6361 .- 1432-0746. ; 307:1, s. 15-20
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Tidskriftsartikel (refereegranskat)abstract
- For over 20 years, many models have been proposed to explain the variability of AO0235+164. Among them, the most favorable has been micro-lensing. We have made a series of VLBI observations on this source in order to better understand its nature. The resultant maps indicate dramatic changes in the position angle of the jet between observations as well as a correlation between the intensity of the VLBI core and flux outbursts which occurred between the observing sessions. These characteristics, in conjunction with other arguments, suggest that the source variability is intrinsic, i.e. microlensing is of minor importance. We suggest two models: 1) a model in which the jet starts at a very small angle to the line of sight and then curves away to become about 6deg at about 1 mas from the core; and 2) a CME (Coronal Mass Ejection) model that also may explain the violent variability in intensity, polarization position angle, and jet direction in AO0235+164.
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