Zarbin,Paulo H. G., Moreira,Marcos A. B., Haftmann,Jenny, Francke,Wittko, Oliveira,Alfredo R. M.
The behavioral responses of adult male and female Pseudopiazurus obesus (Boheman, 1838) (Coleoptera: Curculionidae) to several odour sources were evaluated in a Y-tube olfactometer. Males and females...
Larsson, Mattias C, Hallberg, Eric, Kozlov, Mikhail V, Francke, Wittko, Hansson, Bill S, Löfstedt, Christer
We performed a physiological and morphological characterization of sensilla auricillica in male Eriocrania semipurpurella moths. Each auricillic sensillum contained three olfactory receptor neurons....
Francke,Wittko, Lübke,Gunther, Schröder,Wolfgang, Reckziegel,Aurélia, Imperatriz-Fonseca,Vera, Kleinert,Astrid, ...
The volatile constituents of cephalic secrections of 11 Brazilian social stingless bee species of the Tetragonisca - Tetragona line have been analysed. By gas chromatography/mass spectrometry 145...
Manfred Ayasse, Florian P. Schiestl, Hannes F. Paulus, Christer Löfstedt, Bill Hansson, Fernando Ibarra, ...
The orchid Ophrys sphegodes Miller is pollinated by sexually excited males of the solitary bee Andrena nigroaenea, which are lured to the flowers by visual cues and volatile semiochemicals. In O....
Synthesis and stereochemistry of insect derived spiroacetals with branched carbon skeletons (2000)
Tu, Yong Q., Hubener, Achim, Zhang, Hesheng, Moore, Christopher J., Fletcher, Mary T., Hayes, Patricia, ...
About thirty constitutionally different spiroacetals have been characterised from insects but only three have branched carbon skeletons. Two are based on the 1,7-dioxoaspiro[5.5]undecane system and...
Papke,Ulrich, Gross,Elisabeth M., Francke,Wittko
A new 2-pyrrolidinone with a polyunsaturated side chain has been identified from the cyanobacterium Fischerella muscicola (Thuret). Its structure was elucidated by UV, NMR and mass spectroscopy....
Papke, Ulrich, Gross, Elisabeth M., Francke, Wittko
A new 2-pyrrolidinone with a polyunsaturated side chain has been identified from the cyanobacterium Fischerella muscicola (Thuret). Its structure was elucidated by UV, NMR and mass spectroscopy....
Papke, Ulrich, Gross, Elisabeth, Francke, Wittko
A new 2-pyrrolidinone with a polyunsaturated side chain has been identified from the cyanobacterium Fischerella muscicola (Thuret). Its structure was elucidated by UV, NMR and mass spectroscopy....
Thesis (doctoral)--Universität Hamburg, 1973.
Cometabolic Degradation of Dibenzofuran by Biphenyl-Cultivated Ralstonia sp. Strain SBUG 290†
Becher, Dörte, Specht, Michael, Hammer, Elke, Francke, Wittko, Schauer, Frieder
Cells of the gram-negative bacterium Ralstonia sp. strain SBUG 290 grown in the presence of biphenyl are able to cooxidize dibenzofuran which has been 1,2-hydroxylated. Meta cleavage of the...
Gesell, Manuela, Hammer, Elke, Specht, Michael, Francke, Wittko, Schauer, Frieder
We examined the pathway by which the fungicide biphenyl is metabolized in the imperfect fungus Paecilomyces lilacinus. The initial oxidation yielded the three monohydroxylated biphenyls. Further...
Rieger, Paul-Gerhard, Sinnwell, Volker, Preuß, Andrea, Francke, Wittko, Knackmuss, Hans-Joachim
Biodegradation of 2,4,6-trinitrophenol (picric acid) by Rhodococcus erythropolis HLPM-1 proceeds via initial hydrogenation of the aromatic ring system. Here we present evidence for the formation of a...
Hammer, Elke, Krowas, Dirk, Schäfer, Annett, Specht, Michael, Francke, Wittko, Schauer, Frieder
We characterized the ability of a yeast to cleave the aromatic structure of the dioxin-like compound dibenzofuran. The yeast strain was isolated from a dioxin-contaminated soil sample and identified...
Degradation of 1,2,4-Trichloro- and 1,2,4,5-Tetrachlorobenzene by Pseudomonas Strains
Sander, Peter, Wittich, Rolf-Michael, Fortnagel, Peter, Wilkes, Heinz, Francke, Wittko
Two Pseudomonas sp. strains, capable of growth on chlorinated benzenes as the sole source of carbon and energy, were isolated by selective enrichment from soil samples of an industrial waste deposit....
Metabolism of Dibenzofuran by Pseudomonas sp. Strain HH69 and the Mixed Culture HH27
Fortnagel, Peter, Harms, Hauke, Wittich, Rolf-Michael, Krohn, Sabine, Meyer, Holger, Sinnwell, Volker, ...
A Pseudomonas sp. strain, HH69, and a mixed culture, designated HH27, were isolated by selective enrichment from soil samples. The pure strain and the mixed culture grew aerobically on dibenzofuran...
Transformation of Dibenzo-p-Dioxin by Pseudomonas sp. Strain HH69
Harms, Hauke, Wittich, Rolf-Michael, Sinnwell, Volker, Meyer, Holger, Fortnagel, Peter, Francke, Wittko
Dibenzo-p-dioxin was oxidatively cleaved by the dibenzofuran-degrading bacterium Pseudomonas sp. strain HH69 to produce minor amounts of 1-hydroxydibenzo-p-dioxin and catechol, while a 2-phenoxy...
Rappert, Sugima, Botsch, Kathrin Caroline, Nagorny, Stephanie, Francke, Wittko, Müller, Rudolf
A bacterium was isolated from the waste gas treatment plant at a fishmeal processing company on the basis of its capacity to use 2,3-diethyl-5-methylpyrazine (DM) as a sole carbon and energy source....
Cometabolic Degradation of Dibenzofuran by Biphenyl-Cultivated Ralstonia sp. Strain SBUG 290†
Becher, Dörte, Specht, Michael, Hammer, Elke, Francke, Wittko, Schauer, Frieder
Cells of the gram-negative bacterium Ralstonia sp. strain SBUG 290 grown in the presence of biphenyl are able to cooxidize dibenzofuran which has been 1,2-hydroxylated. Meta cleavage of the...
Gesell, Manuela, Hammer, Elke, Specht, Michael, Francke, Wittko, Schauer, Frieder
We examined the pathway by which the fungicide biphenyl is metabolized in the imperfect fungus Paecilomyces lilacinus. The initial oxidation yielded the three monohydroxylated biphenyls. Further...
Rieger, Paul-Gerhard, Sinnwell, Volker, Preuß, Andrea, Francke, Wittko, Knackmuss, Hans-Joachim
Biodegradation of 2,4,6-trinitrophenol (picric acid) by Rhodococcus erythropolis HLPM-1 proceeds via initial hydrogenation of the aromatic ring system. Here we present evidence for the formation of a...
Hammer, Elke, Krowas, Dirk, Schäfer, Annett, Specht, Michael, Francke, Wittko, Schauer, Frieder
We characterized the ability of a yeast to cleave the aromatic structure of the dioxin-like compound dibenzofuran. The yeast strain was isolated from a dioxin-contaminated soil sample and identified...
Degradation of 1,2,4-Trichloro- and 1,2,4,5-Tetrachlorobenzene by Pseudomonas Strains
Sander, Peter, Wittich, Rolf-Michael, Fortnagel, Peter, Wilkes, Heinz, Francke, Wittko
Two Pseudomonas sp. strains, capable of growth on chlorinated benzenes as the sole source of carbon and energy, were isolated by selective enrichment from soil samples of an industrial waste deposit....
Metabolism of Dibenzofuran by Pseudomonas sp. Strain HH69 and the Mixed Culture HH27
Fortnagel, Peter, Harms, Hauke, Wittich, Rolf-Michael, Krohn, Sabine, Meyer, Holger, Sinnwell, Volker, ...
A Pseudomonas sp. strain, HH69, and a mixed culture, designated HH27, were isolated by selective enrichment from soil samples. The pure strain and the mixed culture grew aerobically on dibenzofuran...
Transformation of Dibenzo-p-Dioxin by Pseudomonas sp. Strain HH69
Harms, Hauke, Wittich, Rolf-Michael, Sinnwell, Volker, Meyer, Holger, Fortnagel, Peter, Francke, Wittko
Dibenzo-p-dioxin was oxidatively cleaved by the dibenzofuran-degrading bacterium Pseudomonas sp. strain HH69 to produce minor amounts of 1-hydroxydibenzo-p-dioxin and catechol, while a 2-phenoxy...
Rappert, Sugima, Botsch, Kathrin Caroline, Nagorny, Stephanie, Francke, Wittko, Müller, Rudolf
A bacterium was isolated from the waste gas treatment plant at a fishmeal processing company on the basis of its capacity to use 2,3-diethyl-5-methylpyrazine (DM) as a sole carbon and energy source....
Pollinator attraction in a sexually deceptive orchid by means of unconventional chemicals.
Ayasse, Manfred, Schiestl, Florian P, Paulus, Hannes F, Ibarra, Fernando, Francke, Wittko
Ophrys flowers mimic virgin females of their pollinators, and thereby attract males for pollination. Stimulated by scent, the males attempt to copulate with flower labella and thereby ensure...
An Inhibitory Sex Pheromone Tastes Bitter for Drosophila Males
Lacaille, Fabien, Hiroi, Makoto, Twele, Robert, Inoshita, Tsuyoshi, Umemoto, Daisuke, Manière, Gérard, ...
Sexual behavior requires animals to distinguish between the sexes and to respond appropriately to each of them. In Drosophila melanogaster, as in many insects, cuticular hydrocarbons are thought to...
Evolution of ‘pollinator’- attracting signals in fungi
Schiestl, Florian P, Steinebrunner, Fabrizio, Schulz, Claudia, Von Reuß, Stephan, Francke, Wittko, Weymuth, Christophe, ...
Fungi produce a plethora of secondary metabolites yet their biological significance is often little understood. Some compounds show well-known antibiotic properties, others may serve as volatile...
Spitting out information: Trigona bees deposit saliva to signal resource locations
Schorkopf, Dirk Louis P, Jarau, Stefan, Francke, Wittko, Twele, Robert, Zucchi, Ronaldo, Hrncir, Michael, ...
Stingless bees of the species Trigona spinipes (Fabricius 1793) use their saliva to lay scent trails communicating the location of profitable food sources. Extracts of the cephalic labial glands of...
Enfleurage, lipid recycling and the origin of perfume collection in orchid bees
Eltz, Thomas, Zimmermann, Yvonne, Haftmann, Jenny, Twele, Robert, Francke, Wittko, ...
Enfleurage, the extraction of elusive floral scents with the help of a lipophilic carrier (grease), is widely used in the perfume industry. Male neotropical orchid bees (Euglossini), which accumulate...
Steiger, Sandra, Peschke, Klaus, Francke, Wittko, Müller, Josef K
The waxy layer of the cuticle has been shown to play a fundamental role in recognition systems of insects. The biparental burying beetle Nicrophorus vespilloides is known to have the ability to...
Löfstedt, Christer, Bergmann, Jan, Francke, Wittko, Jirle, Erling, Hansson, Bill S., Ivanov, Vladimir D.
In the caddisfly Molanna angustata, females produce a sex pheromone in glands with openings on the fifth sternite. Gas chromatographic analyses of pheromone gland extracts with electroantennographic...