Browsing by Title Facultad de Ciencias
Now showing items 4127-4146 of 8173
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(Kluwer Academic Publishers, 1988)Fifty-five accessions of Triticum species were analyzed for content of hydroxamic acids (Hx), a natural resistance factor against various organisms. Hx were found in all accessions analyzed. Extreme values were found in ...
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(Kluwer Academic Publishers-Plenum Publishers, 1992)DIMBOA glucoside (2-O-/gb-D-glucopyranosyl-4-hydroxy-7-meth-oxy-1,4-benzoxazin-3-one), the main hydroxamic acid (Hx) in intact wheat plants, was detected in the honey dew of Rhopalosiphum padi feeding on seedlings of six ...
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(1988)Hydroxamic acids of the type 4-hydroxy-1,4-benzoxazm-3-ones constitute one of the most extensively studied secondary metabolites m relation to host plant resistance to pests and diseases They play a maJor role in the defence ...
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(1990)Hydroxamic acids were quantified by HPLC in leaves of one-week-old seedlings and in 30 day-old callus tissues of four wheat cultivars. Leaves accumulated preferentially 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA). ...
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(1991)2,4‐Dihydroxy‐7‐methoxy‐1,4‐benzoxazin‐3‐one (DIMBOA), a hydroxamic acid (Hx) occurring in wheat, was shown to deter feeding by the aphid Rhopalosiphum padi (L.), and to reduce BYDV transmission to the plant. Dual choice ...
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(2009)Many cereals accumulate hydroxamic acids derived from 2-hydroxy-2H-1,4- benzoxazin-3(4H)-one. These benzoxazinoid hydroxamic acids are involved in defense of maize against various lepidopteran pests, most notably the ...
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(VERLAG Z NATURFORSCH, 2006-10)Contents of the hydroxamic acids 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA), and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA) in leaves and roots of 14 cultivars of rye, Secale cereale L., were determined. Dynamics ...
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(Elsevier, 2021)Chemical investigation of the alkaloid extract of the aerial parts of Schizanthus tricolor led to the targeted isolation of 26 hygroline derivatives of which 20 were fully characterized. They have not yet been described ...
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(1999)Mutations in the human skeletal muscle Na+ channel underlie the autosomal dominant disease hyperkalemic periodic paralysis (HPP). Muscle fibers from affected individuals exhibit sustained Na+ currents thought to depolarize ...
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(Elsevier, 2013)An atomic-level simulation of the collisions between a nano-projectile against a target, both composed of copper, is presented. The study is performed by means of molecular dynamics simulations, in a system at a temperature ...
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(Springer, 2012)It has been reported that dormancy-breaking compound hydrogen cyanamide (HC) stimulates the fermentative pathway and inhibits respiration in grapevinebuds, suggesting in this way, that a respiratory stress must be ...
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(2012)Paradoxically, in eukaryotic cells, hydrogen peroxide (H2O 2) accumulates in response to oxygen deprivation (hypoxia). The source of H2O2 under hypoxia varies according to the species, organs, and tissue. In nonphotosynthetic ...
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(2012)Paradoxically, in eukaryotic cells, hydrogen peroxide (H2O2) accumulates in response to oxygen deprivation (hypoxia). The source of H2O2 under hypoxia varies according to the species, organs, and tissue. In nonphotosynt ...
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(SPRINGER, 2006)The magnetosphere is a multi-scale spatio-temporal complex dynamical system. Self-organization is a possible solution to the seemingly contradicting observation of the repeatable and coherent substorm phenomena with ...
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(ACADEMIC PRESS INC ELSEVIER SCIENCE, 2010-10-08)In this paper we study plenary train algebras of arbitrary rank. We show that for most parameter choices of the train identity, the additional identity (x2 − ω(x)x)2 = 0 is satisfied. We also find sufficient conditions ...
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(Universidad de Chile, 1990)Los problemas estudiados en este trabajo, tiene su origen en el estudio de las álgebras ponderadas (A,w) , sobre un cuerpo K de característica distinta de 2 (introducida por I.M.H. Etherington, 1939), es decir K álgebras ...
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(Universidad de Chile, 2016)
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(Universidad de Chile., 2021)Durante las etapas tardías del ciclo replicativo, el ARN genómico (ARNg) del Virus de la Inmunodeficiencia Humana de tipo 1 (VIH-1) se ensambla en complejos ribonucleoprotéicos (mRNPs) específicos cuya composición determina ...
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(Universidad de Chile, 2019)Tradicionalmente, los líquenes se definen como una asociación simbiótica mutualista entre un hongo y uno o dos organismos fotosintéticos (alga y/o cianobacteria). Investigaciones actuales han descrito una comunidad ...
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(Universidad de Chile, 2018)En insectos eusociales, el reconocimiento y la comunicación entre compañeros de nido soportan la estructura social de la colonia. Estas conclusiones se basan más en estudios en himenópteros que en termitas (Blattodea). En ...