| 1. |
- Messinger, Johannes, 1963-, et al.
(författare)
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THE FLASH PATTERN OF PHOTOSYNTHETIC OXYGEN EVOLUTION AFTER TREATMENT WITH LOW CONCENTRATIONS OF HYDROXYLAMINE AS A FUNCTION OF THE PREVIOUS S1/S0-RATIO - FURTHER EVIDENCE THAT NH2OH REDUCES THE WATER OXIDIZING COMPLEX IN THE DARK
- 1991
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Ingår i: Zeitschrift für Naturforschung C - A Journal of Biosciences. - TECH UNIV BERLIN,MAX VOLMER INST BIOPHYS & PHYS CHEM,STR 17,JUNI 135,W-1000 BERLIN 12,GERMANY. : VERLAG Z NATURFORSCH. - 0939-5075 .- 1865-7125. ; 46:11-12, s. 1033-1038
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Tidskriftsartikel (refereegranskat)abstract
- Flash induced oxygen evolution patterns of isolated PS II complexes from the cyanobacterium Synechococcus were measured with a Joliot-type electrode. By suitable preflash and dark adaptation procedures, samples were prepared in the state S1 (100%), as well as enriched in S0 (60% S0, 40% S1). After treatment with low concentrations of NH2OH (less-than-or-equal-to 100-mu-M), the two flash patterns were identical. This is further evidence for a reduction of the water oxidizing complex by hydroxylamine in the dark. Two reduced states (S-1 and S-2) below S0 are formed by this reduction.
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| 2. |
- Tóth, Miklos, et al.
(författare)
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Epoxyheptadecadienes Identified as Sex Pheromone Components of Tephrina arenacearia Hbn. (Lepidoptera Geometridae)
- 1991
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Ingår i: Zeitschrift fur Naturforschung - Section C Journal of Biosciences. - : Walter de Gruyter GmbH. - 0939-5075. ; 46:3-4, s. 257-263
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Tidskriftsartikel (refereegranskat)abstract
- (Z, Z)-3, 9-cis-6, 7-Epoxyheptadecadiene, and (Z, Z)-6, 9-cis-3, 4-epoxyheptadecadiene were identified by gas chromatography/flame ionization detection-electroantennographic detection (GC/FID-EAD) and coupled gas chromatography-mass spectrometry (GC-MS) from abdominal tip extracts of Tephrina arenacearia (Lepidoptera: Geometridae), an alfalfa pest. In gas chromatography/flame ionization—single sensillum detection (GC/FID-SC) analyses, specific olfactory receptor cells were found for (Z, Z)-6, 9-cis-3, 4-epoxyheptadecadiene, and tricosane. Synthetic samples of racemic (Z, Z)-6, 9-cis-3, 4-epoxyheptadecadiene attracted large numbers of male T. arenacearia into traps. Best catches were observed at 100–1000 μg dosages. The addition of (Z, Z,Z)-3, 6,9-heptadecatriene did not influence catches. (Z, Z,Z)-3, 6,9-Heptadecatriene and (Z, Z)-6, 9-cis-3, 4-epoxyheptadecadiene were also identified in the pheromone gland extract of Chiasma clathrata, another geometrid pest of alfalfa.
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| 3. |
- Tóth, Miklos, et al.
(författare)
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Pheromonal Production of and Response to Optically Active Epoxydienes in Some Ceometrid Moths (Lepidoptera: Geometridae)
- 1994
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Ingår i: Zeitschrift fur Naturforschung - Section C Journal of Biosciences. - : Walter de Gruyter GmbH. - 0939-5075. ; 49:7-8, s. 516-521
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Tidskriftsartikel (refereegranskat)abstract
- In, pheromone extracts of calling female Chiasma clathrata, L. (Lepidoptera: Geometridae), a defoliator pest of alfalfa, (Z,Z,Z)-3,6,9–heptadecatriene and (Z,Z)-6,9–cis-3,4–epoxyhepta-decadiene was identified. Chiral gas chromatography using a modified cyclodextrin and synthetic reference samples proved the natural epoxide to show (3 R.4 S)-configuration. In field trapping tests, only the pure (3/R,4S)-enantiomer of the epoxide attracted males. The addition of the triene component was synergistic. Males of the sympatric species Tephrina arenaceciria Hbn. (Lepidoptera: Geometridae) were caught only in traps with baits containing the (3S,4R)-enantiomer [together with a previously described minor component, (Z,Z)-3,9–cis-6,7–epoxyheptadecadiene], In trapping tests conducted iNADifferent biotope Abraxas grossu-lariata, L. (Lepidoptera: Geometridae) males were attracted by the (3S,4R)-enantiomer, whereas the (3/L4S)-enantiomer attracted a close relative. Abraxas sylvata Scop. (Lepidoptera: Geometridae). The present results suggest that one of the key mechanisms responsible for pheromone specificity among both the two alfalfa geometrids and the two Abraxas species in their respective biotops, may be the use of different enantiomers of the same polyene-derived epoxide as a sex pheromone component. It is probable that this discrimination mechanism is widespread among moth species utilizing epoxide pheromone components.
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