Browsing by Author "6805cc70-f0a6-4e1f-9f8a-c6a4b6ee7b8d"
Now showing items 61-80 of 90
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Gianoli, Ernesto; Niemeyer, Hermann M. (Blackwell Publishing Ltd, 1997)Aphid infestation triggered a significant induction of hydroxamic acids (Hx) in wild wheat Triticum uniaristatum seedlings in comparison to control seedlings. We hypothesized that indirect costs of Hx induction (expressed ...
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Cossio-Rodriguez, Romina; Cocroft, Reginald B.; Niemeyer, Hermann M.; Pinto, Carlos F. (Blackwell Publishing Ltd, 2019)1. In treehoppers in which courtship has been studied, males initiate the search for females by periodically emitting a vibrational signal. The responses by the female are used by males as a beacon and give rise to a duet. ...
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Figueroa, Christian C.; Simon, Jean Christophe; Le Gallic, Jean Francois; Niemeyer, Hermann M. (1999)A set of molecular markers to differentiate the aphid (Hemiptera: Aphidoidea) species Sitobion avenae (Fabricius) from Sitobion fragariae (Walker), is presented. These markers correspond to (1) a region of the mitochondrial ...
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Flores-Prado, Luis; Aguilera-Olivares, Daniel; Niemeyer, Hermann M. (Royal Society, 2008)In eusocial Hymenoptera, females are more tolerant towards nest-mate than towards non-nest-mate females. In solitary Hymenoptera, females are generally aggressive towards any conspecific female. Field observations of the ...
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Flores‐Prado, Luis; Chiappa, Elizabeth; Niemeyer, Hermann M. (2008)The Xylocopinae contains four tribes with species which show a range of nesting habits, from solitary to social. The Manueliini is the sister group to all other Xylocopine tribes, with one genus, Manuelia, of three species ...
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Echeverría, Javier; Niemeyer Marich, August (Academic Press, 2013)The consumption of plant-derived hallucinogenic substances through smoking and snuffing is a long-standing tradition in the south-central Andes. Chemical and archaeobotanical evidence point to the consumption of nicotine ...
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Gianoli, Ernesto; Niemeyer, Hermann M. (Universite Laval, 1998)Following a short-term infestation by aphids, wheat seedlings show an increase in their concentration of hydroxamic acids (Hx), secondary metabolites conferring resistance against insects. The benefits for a wheat cultivar ...
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Pettersson, Jan; Quiroz, Andrés; Stephansson, David; Niemeyer, Hermann M. (1995)
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Partial purification and characterization of a hydroxamic acid glucoside β-d-glucosidase from maize Cuevas, Liliana; Niemeyer Marich, August; Jonsson, Lisbeth M.V. (Elsevier, 1992)β-Glucosidase activities measured in extracts from maize leaves during development gave different curves when p-nitrophenyl β-d-glucopyranoside (PNP-Glc) or hydroxamic acid glucoside (Hx-Glc) were the substrates. The PNP-Glc ...
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Catalán, Tamara P.; Barceló, Matías; Niemeyer, Hermann M.; Kalergis, Alexis M.; Bozinovic, Francisco (2011)Background: Feeding habits and dietary nutritional content may play a key role in pathogendependent foraging ecology, because mounting an effective immune response is costly for the host. Hypothesis: Since immune defence ...
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Castañeda, Luis E.; Figueroa, Christian C.; Fuentes-Contreras, Eduardo; Niemeyer, Hermann M.; Nespolo, Roberto F. (2010)'Superclones' are predominant and time-persistent genotypes, exhibiting constant fitness across different environments. However, causes of this ecological success are still unknown. Therefore, we studied the physiological ...
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Escobar, Carlos; Niemeyer, Hermann (1993)Swedish wheats were analysed at the seedling stage for hydroxamic acids (Hx), a family of natural aphid resistance factors. Analysis comprised the historical development from old landraces to modem cultivars, and included ...
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Pérez, Francisco J.; Niemeyer, Hermann M. (1989)DIMBOA (2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one), a hydroxamic acid from cereals, reacted with primary amines to give an addition compound with two imino groups. Kinetic studies with DIMBOA and with the DIMBOA analogues ...
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Valdivia, Carlos E.; Niemeyer, Hermann M. (2005)Assessments of the effects of invertebrate herbivores on high-altitude plants have seldom taken into account both mutualistic and antagonistic interactions. To evaluate the effect of herbivores (antagonists) and pollinators ...
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Argandoña, Victor H.; Luza, Juvenal G.; Niemeyer, Hermann M.; Corcuera, Luis J. (1980)Hydroxamic acid concentration in Gramineae, both natural and incorporated, correlates with resistance to the aphid Metopolophium dirhodum. 2,4-Dihydroxy-7-methoxy-2H-1,4-benzoxazin-3(4H)-one, a hydroxamic acid isolated ...
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Russell, Graeme B.; Faundez, Eric H.; Niemeyer, Hermann M. (2004)Leaf volatiles were collected from three Nothofagus species growing in close proximity in Los Ruiles National Reserve, Chile. The volatile preparation from leaves of No. alessandrii were attractive to the specialist aphid, ...
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Torres Contreras, Hugo; Olivares-Donoso, Ruby; Niemeyer, Hermann M. (2007)Several North American species of Pogonomyrmex harvester ants exhibit group foraging, whereas South American species are exclusively solitary foragers. The composition of the secretions of the poison and Dufour glands in ...
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Labra, Antonieta; Escobar, Carlos A.; Aguilar, Paz M.; Niemeyer, Hermann M. (Sociedad de Biologia de Chile, 2002)Experimental tests were conducted with the lizard Liolaemus tenuis (Tropiduridae), to determine the potential sources of pheromones used in its chemical communication, centered in the phenomenon of self-recognition. During ...
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Leighton, Victoria; Niemeyer, Hermann M.; Jonsson, Lisbeth M.V. (1994)Microsomal preparations from maize seedlings exhibited N-hydroxylase activity with 2-hydroxy-1,4-benzoxazin-3-one (HBOA) as substrate, but not with its 7-methoxy analogue (HMBOA), or their corresponding 2-O-β-d-glucosides. ...
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Córdova-Yamauchi, Leslie; Gianoli, Ernesto; Quiroz, Andrés; Niemeyer, Hermann M. (Czech Academy of Sciences, 1998)The behavioural response of an aphid-tending ant, the Argentine ant Linepitherma humile, to semiochemicals related with spacing behaviour in the aphid Rhopalosiphum padi (L.) was used evaluated. The compounds involved were ...