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- Fomalont, E. B., et al.
(författare)
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THE 2014 ALMA LONG BASELINE CAMPAIGN: AN OVERVIEW
- 2015
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Ingår i: Astrophysical Journal Letters. - : American Astronomical Society. - 2041-8213 .- 2041-8205. ; 808:1
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Tidskriftsartikel (refereegranskat)abstract
- A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions of tens of milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up to similar to 15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from 2014 September to late November, culminating in end-to-end observations, calibrations, and imaging of selected Science Verification (SV) targets. This paper presents an overview of the campaign and its main results, including an investigation of the short-term coherence properties and systematic phase errors over the long baselines at the ALMA site, a summary of the SV targets and observations, and recommendations for science observing strategies at long baselines. Deep ALMA images of the quasar 3C 138 at 97 and 241 GHz are also compared to VLA 43 GHz results, demonstrating an agreement at a level of a few percent. As a result of the extensive program of LBC testing, the highly successful SV imaging at long baselines achieved angular resolutions as fine as 19 mas at similar to 350 GHz. Observing with ALMA on baselines of up to 15 km is now possible, and opens up new parameter space for submm astronomy.
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| 2. |
- Szöcs, G., et al.
(författare)
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Species discrimination in five species of winter-flying geometrids (Lepidoptera) based on chirality of semiochemicals and flight season
- 1993
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Ingår i: Journal of Chemical Ecology. - 0098-0331. ; 19:11, s. 2721-2735
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Tidskriftsartikel (refereegranskat)abstract
- Enantiomer separation of (6 Z,9 Z)-cis-3,4-epoxynonadecadiene and (3 Z,9 Z)-cis-6,7-epoxynonadecadiene could be achieved using chiral high-resolution gas chromatography and a cyclodextrin-bond column. (3 Z,9 Z)-(6 R,7 S)-Epoxynonadecadiene was identified from ovipositor extracts of Colotois pen-Naria, while in Erannis defoliaria the 6 S,7 R-enantiomer was found. In field trapping tests pure synthetic enantiomers caught only conspecific males of these species. (3 Z,6 Z,9 Z)-Nonadecatriene was found in both species, while the presence of (3 Z,6 Z,9 Z)-heneicosatriene was indicated in C. Pennaria only. A 10:10:3 blend of (3 Z,9 Z)-(6 R,7 S)-epoxynonadecadiene, (3 Z,6 Z,9 Z)-heneicosatriene, and (3 Z,6 Z,9 Z)-nonadecatriene was found to be optimal for catching C. Pennaria, while E. Defoliaria males were optimally caught by a 1:1 mixture of (3 Z,9 Z)-(6 S,7 R)-epoxynonadecadiene and (3 Z,6 Z,9 Z)-nona-decatriene. (6 Z,9 Z)-(3 S,4 R)-Epoxynonadecadiene was identified from ovipositor extracts of Agriopis (Erannis) aurantiaria. In field tests the pure enantiomer proved to be a highly specific sex attractant for both the late autumn/early winter flying A. Aurantiaria and the late winter/early spring flying A. Leucophearia. Males of Agriopis marginaria, which fly in late winter/early spring, were attracted to (3 Z,9 Z)-(6 S,7 R)-epoxynonadecadiene. The addition of (3 Z,6 Z,9 Z)-nonadecatriene to the S,R-enantiomer increased captures. Optimal catches were recorded with a 10:3 epoxide-hydrocarbon blend. Enantiomer specificity in all species was confirmed in EAG measurements.
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| 3. |
- AYASSE, M, et al.
(författare)
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ARE THERE PHEROMONAL DOMINANCE SIGNALS IN THE BUMBLEBEE BOMBUS-HYPNORUM L (HYMENOPTERA, APIDAE)
- 1995
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Ingår i: APIDOLOGIE. - : EDITIONS SCIENTIFIQUES ELSEVIER. - 0044-8435. ; 26:3, s. 163-180
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In the bumblebee Bombus hypnorum (Apidae) 132 chemical compounds could be identified by GC/MS and coinjection. The behavior of individual workers was observed to characterize them as dominant, subordinate or foragers. Queens, dominance groups of workers a
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| 8. |
- Baker, T. C., et al.
(författare)
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Identification and bioassay of sex pheromone components of carob moth, Ectomyelois ceratoniae (Zeller)
- 1991
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Ingår i: Journal of Chemical Ecology. - 0098-0331. ; 17:10, s. 1973-1988
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Tidskriftsartikel (refereegranskat)abstract
- Three sex pheromone components of the carob moth were isolated and identified from the extract of female pheromone glands, using a variety of techniques including coupled gas chromatographic-electroantennographic recordings, coupled gas chromatographic-mass spectrometric analysis, microozonolysis, electroantennographic assays of monounsaturated standards, wind-tunnel bioassays, and field trials. The major component was identified as (Z,E)-9,11,13-tetradecatrienal, a novel lepidopterous pheromone component structure. Two minor components, either one of which improves the upwind flight response of males when blended with the major component, were identified as (Z,E)-9,11-tetradecadienal, and (Z)-9-tetra-decenal.
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| 9. |
- Baker, T. C., et al.
(författare)
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Isolation, identification and synthesis of sex pheromone components of the carob moth, Ectomyelois ceratoniae
- 1989
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Ingår i: Tetrahedron Letters. - 0040-4039. ; 30:22, s. 2901-2902
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Tidskriftsartikel (refereegranskat)abstract
- The sex pheromone of females of the carob moth, Ectomyelois ceratoniae, was identified to be a mixture of (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal in the ratio of 10:1:1. A synthetic blend proved to be attractive. GC/EAD + GC/MS investigations showed (Z,E)-9,11,13-tetradecatrienal, (Z,E)-9,11-tetradecadienal and (Z)-9-tetradecenal to be the sex pheromone of the carob moth. Blends of synthetic compounds are active.
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| 10. |
- Bergmann, J, et al.
(författare)
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Identification and assignment of the absolute configuration of biologically active methyl-branched ketones from limnephilid caddisflies
- 2001
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Ingår i: European Journal of Organic Chemistry. - 1434-193X. ; 2001:16, s. 3175-3179
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Tidskriftsartikel (refereegranskat)abstract
- Glands of the 4th and 5th abdominal sternite of the caddis flies Potamophylax latipennis, Potamophylax cingulatus, and Glyphotaelius pellucidus contain (S)-4-methyl-3-heptanone (4a), (4S,6S)-4,6-dimethyl-3-octanone (4b), and (4S,6S)-4,6-dimethyl-3-nonanone (4c). As shown by gas chromatography coupled with electrophysiological recordings, these ketones elicit a strong response in the insects' antennae. The structural assignment of the compounds was achieved on the basis of mass spectra, enantioselective synthesis, and gas chromatography on a chiral stationary phase.
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