Browsing by Author "1fd59521-ee24-4db0-95b1-591275ec2f1b"
Now showing items 1-20 of 35
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1988)The aerial parts of Aphyllocladus denticulatus afforded, in addition to some widespread compounds, six 5-methylcoumarin derivatives isolated previo. © 1988.
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NICOL, D.; COPAJA, S. V.; WRATTEN, S. D.; NIEMEYER, H. M. (1992)In a screen of seedlings of a worldwide range of 47 cultivars of Triticum (mainly T. aestivum) the concentration of the hydroxamic acid DIMBOA ranged between 1 and 8 mmol/kg fresh wt. In a bioassay in which alatae of the ...
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García, C.; García, S. I.; Heinzen, H.; Moyna, P.; Niemeyer, H. M. (John Wiley and Sons Ltd, 1998)A new method is described for the quantification of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) and 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA), the main hydroxamic acids in wheat and rye extracts, respectively, ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1991)The aerial parts of B. santelicis afforded several known furoclerodanes and phenolics. In addition to known compounds an unusual dimeric sesquiterpene and five labdane derivatives were isolated from B. petiolata. The ...
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Daza-Bustamante, P.; Fuentes-Contreras, E.; Rodríguez, L. C.; Figueroa, C. C.; Niemeyer, H. M. (2002)The Palaeoarctic parasitoid Aphidius ervi Haliday (Hymenoptera, Aphidiidae) parasitises legume aphids in its region of origin. In Chile, it parasitises both legume and cereal aphids. This special situation was studied at ...
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Gianoli, E.; Papp, M.; Niemeyer, H. M. (Association of Applied Biologists, 1996)Estimations of infestation by the bird cherry-oat aphid (Rhopalosiphum padi) as well as measurements of grain yield in 26 Hungarian winter wheat cultivars under field conditions were correlated with the concentration of ...
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Gaete-Eastman, C.; Figueroa, C. C.; Olivares-Donoso, R.; Niemeyer, H. M.; Ramírez, C. C. (2004)Herbivorous insect species with narrow diet breadth are expected to be more prone to genetic differentiation than insect species with a wider diet breadth. However, a generalist can behave as a local specialist if a single ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1988)The aerial parts of Gypothamnium pinifolium afforded, in addition to three known 5-methyl coumarins, four new 5-methyl coumarins and two closely related coumaranones. Furthermore, seven diterpenes, all derived from ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1990)The aerial parts of Haplopappus deserticola afforded three ent-labdane and one labdane derivative as well as a nor-ent-labdane. Furthermore, in addition to three known umbelliferone derivatives, a dimeric coumarin was ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1990)The aerial parts of Nardophyllum lanatum, collected in northern Chile, gave in addition to a seco-diterpene isolated from an Argentinian collection two new cis-clerodanes and an acid derived from geranyl geraniol. The ...
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Figueroa, C. C.; Koenig, C.; Araya, C.; Santos, M. J.; Niemeyer, H. M. (Kluwer Academic/Plenum Publishers, 1999)2,4-Dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), a hydroxamic acid involved in the resistance of cereals to aphids, was administered to adult individuals of the aphid Sitobion avenae in artificial diets. Effects on ...
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Effects of DIMBOA on detoxification enzymes of the aphid Rhopalosiphum padi (Homoptera: Aphididae) Mukanganyama, S.; Figueroa, C. C.; Hasler, J. A.; Niemeyer, H. M. (Elsevier Ltd, 2003)The presence of glutathione transferases and esterase activity was investigated in Rhopalosiphum padi and the effects of the cereal hydroxamic acid, 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) on these detoxification ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1990)The aerial parts of Baccharis pingraea, collected in Chile, afforded, in addition to two diterpene glycosides isolated previously, 14 new ones and two of the corresponding desacyl aglycones. The structures were elucidated ...
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Dupré, S.; Grenz, M.; Jakupovic, J.; Bohlmann, F.; Niemeyer, H. M. (1991)From 11 Chilean Senecio species eight new furoeremophilanes and eremophilanolides, eight eremophilane, one cadinane, five germacrane, one oplopanone and five shikimic acid derivatives were isolated in addition to known ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1991)From the aerial parts of Haplopappus pulchellus two new labdanes and six friedolabdanes were isolated while H. arbutoides afforded in addition to known labdanes five new ones, two clerodanes and a cyperone derivative. ...
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Jakupovic, J.; Grenz, M.; Bohlmann, F.; Niemeyer, H. M. (1991)Investigation of five further Chilean Senecio species afforded, in addition to known compounds, four new furoeremophilanes, four eremophilanes, a germacratrienol and an acylpyrrol derivative. Structures were elucidated by ...
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Ahmed, Muniruddin; Niemeyer, H. M. (1991)In addition to known compounds, a new furoeremophilane and two pairs of epimeric acetals with an eremophilane skeleton have been isolated from Senecio pachyphyllos. The structures were elucidated by high field 1H NMR ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1992)The aerial parts of Gutierrezia resinosa gave 15 new diterpenes including 12 labdanes and three nerylgeraniol derivatives. The structures were elucidated by high field NMR spectroscopy. © 1992.
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Fuentes-Contreras, E.; Figueroa, C. C.; Reyes, M.; Briones, L. M.; Niemeyer, H. M. (2004)The tobacco-feeding race of Myzus persicae (Sulzer), formerly known as M. nicotianae Blackman, was introduced into Chile during the last decade. In order to evaluate the genetic diversity and insecticide resistance status ...
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Zdero, C.; Bohlmann, F.; Niemeyer, H. M. (1991)The investigation of three Stevia species afforded a large variety of known sesquiterpene lactones as well as one new guaianolide, two known longipinene derivatives, two ent-labdanes and several other common compounds. © 1991.