Browsing by Author "6805cc70-f0a6-4e1f-9f8a-c6a4b6ee7b8d"
Now showing items 1-20 of 90
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Marín Briano, Víctor; Rodríguez, Luis C.; Niemeyer, Hermann M. (2012)Opuntia scrublands are important socio-ecological systems (SESs) in the Andean area. Opuntia provides a variety of products employed in the human diet and in animal feed, as well as cochineal insects, a highly valued source ...
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Daza-Bustamante, Pauline; Fuentes-Contreras, Eduardo; Niemeyer, Hermann M. (Czech Academy of Sciences, 2003)Aphidius ervi Haliday is a parasitoid of natural populations of both Acyrthosiphon pisum (Harris) on alfalfa and Sitobion avenae (Fabricius) on wheat in Chile. In this study the performance of the aphid parasitoid on both ...
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Labra, Antonieta; Cortez, Soledad; Niemeyer, Hermann M. (2003)We explored chemical discrimination of own vs. novel space by different age classes (neonates, juveniles, and adults) of the lizard Liolaemus bellii, during pre- and post-hibernation seasons. We recorded the number of ...
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Gianoli, Ernesto; Niemeyer, Hermann M. (Birkhauser Verlag Basel, 1998)We characterized the induction of hydroxamic acids (Hx) by aphid infestation in the wild wheat Triticum uniaristatum by addressing the following questions: i) Do different leaves have similar responses to aphid damage?, ...
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Atkinson, Jeffrey; Morand, Peter; Arnason, John T.; Niemeyer, Hermann M.; Bravo, Héctor R. (1991)Analogues of the aglucones of naturally occurring cyclic hydroxamic acids (2,4-dihydroxy-1,4-benzoxazin-3-ones) from Gramineae (Poaceae) have been synthesized by the reductive cyclization of the ring-substituted methyl ...
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Villagra, Cristian A.; Ramírez, Claudio C.; Niemeyer, Hermann M. (Academic Press, 2002)Under predation risk, prey may prioritize antipredator behaviours and sacrifice feeding. However, energetically constrained animals may choose to sacrifice or change antipredator responses and accept relatively greater ...
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Vargas, Renzo R.; Troncoso, Alejandra J.; Tapia, Daniel H.; Olivares-Donoso, Ruby; Niemeyer, Hermann M. (2005)Host plant selection and acceptance by aphids involves four consecutive steps: (1) prealighting behaviour, (2) leaf surface exploration and probing of subepidermal tissues, (3) deep probing of plant tissues, and (4) ...
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Lagos, Nelson A.; Fuentes-Contreras, Eduardo; Bozinovic, Francisco; Niemeyer, Hermann M. (2001)The effects of parasitisation by Aphidius ervi on the thermoregulatory behaviour of the pea aphid Acyrtosiphon pisum were studied in alfalfa fields and in an experimental thermal gradient. In the field, mummies were found ...
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Torrico Bazoberry, Daniel; Cáceres Sánchez, Liliana; Saavedra Ulloa, Daniela; Flores Prado, Luis; Niemeyer, Hermann M.; Pinto, Carlos F. (Oxford, 2014)Treehoppers (Membracidae) exhibit different levels of sociality, from solitary to presocial. Although they are one of the best biological systems to study the evolution of maternal care in insects, information on the ...
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Belmar, Carolina A.; Alfaro, Silvia; Munita, Doina; Albornoz, Ximena; Carrasco, Carolina; Echeverría, Javier; Mera, Rodrigo; Adán, Leonor; Quiroz, Luciana; Niemeyer, Hermann M.; Planella, Maria Teresa (Universidad de Magallanes, 2017)Archaeological and ethnohistorial data show that smoking practices in the central-southern region of Chile begins during the Early Ceramic period and continue until historical times. In view of this long time span, twelve ...
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Collantes, Hugo G.; Gianoli, Ernesto; Niemeyer, Hermann M. (1998)The effect of defoliation on growth and on levels and allocation patterns of hydroxamic acids (Hx) in maize seedlings was evaluated 6 days after treatment. No significant differences were found between defoliated and ...
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Niemeyer, Hermann M.; Pesel, Erika; Copaja, Sylvia V.; Bravo, Héctor R.; Franke, Stephan; Francke, Wittko (1989)Seedlings of four wheat cultivars were infested with Metopolophium dirhodum nymphs. After aphids had fed for 40 hr on the plants, the levels of the defense metabolite 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one had changed. ...
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Gianoli, Ernesto; Niemeyer, Hermann M. (Springer New York LLC, 1997)Hydroxamic acids (Hx) are natural products of Gramineae that are associated with cereal resistance to pests. We aimed at characterizing the induction of Hx accumulation in seedlings of wheat. Triticum aestivum, by short-term ...
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Teillier, Sebastián; Urzüa, Alejandro; Niemeyer, Hermann M. (2008)Patterns of headspace volatiles and flavonoids extracts from flowers of sympatric populations of Luzuriaga radicans Ruiz et Pav. (Monocotyledoneae: Luzuriagaceae), L. polyphylla (Hook.) J.FMacbr., and a Luzuriaga taxon ...
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Escobar, Claudio M.; Escobar, Carlos A.; Labra, Antonieta; Niemeyer, Hermann M. (2003)The chemical composition of secretions of precloacal pores from two populations of the lizard Liolaemusfabiani (Puilar and Punta-Brava) were compared. This is an endemic species from the Atacama Salt Flat (26°46'S 68° 14'W; ...
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Niemeyer Marich, August; De Souza Herreros, Patricio; Camilo, Conrado; Echeverría, Javier (Elsevier Inc., 2018)Consumption of psychoactive substances is a long-standing tradition among indigenous peoples of the Americas. Archaeologically, consumption of tobacco has been shown through analysis of archaeological smoking pipe residues, ...
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Givovich, Arturo; Niemeyer, Hermann M. (1995)Feeding behaviour of five species of cereal aphids in wheat seedlings differing in hydroxamic acid (Hx) levels, was monitored via electrical penetration graphs (EPG). Aphid species could be grouped as sensitive to the ...
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Niemeyer, Hermann M. (2009)The chemical composition of essential oils of five aromatic Asteraceae native of Chile was examined using GC and GC/MS. In the oil of Gnaphalium philippi Cabrera, 25 compounds were identified, with (E)-nerolidol (44.3%) ...
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Niemeyer, Hermann M.; Zapata, Víctor; Cantillana, Paulina; Missene, Alejandra; Aguilera, José; Torres, Arturo (Academic Press, 2013)Wooden snuff trays from San Pedro de Atacama (SPA) in northern Chile are objects of particular museological value. Computed tomography (CT), a non-destructive analytical technique useful in the analysis of archaeological ...
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López Barrales, Rocío; Hubbe, Mark; Aspillaga Fontaine, Eugenio; Niemeyer, Hermann M. (Universidad de Tarapaca, 2015)Systemic stress in prehispanic populations of San Pedro de Atacama (SPA) during the Middle and Late Intermediate periods was explored through cortisol analysis of hair samples of mummies from these periods. The cortisol ...