Browsing by Title Facultad de Ciencias
Now showing items 4117-4136 of 8173
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(American Chemical Society, 2013)Preferential solvation in aromatic nucleophilic substitution reactions is discussed using a kinetic study complemented with quantum chemical calculations. The model system is the reaction of a series of secondary ...
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(Springer New York LLC, 1998)© Springer-Verlag 1998. Recently, the proton affinity (PA) of ozone was experimentally determined by Cacace and Speranza [Science (1994) 265: 208] using a bracketing technique that involved the proton transfer (PT) reactions: ...
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(Elsevier, 2015)In this work, we report the heat rectifying capability of a-helices. Using molecular dynamics simulations we show an increased thermal diffusivity in the C-Terminal to N-Terminal direction of propagation. The origin of ...
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(American Chemical Society, 2014)Recent evidence has shown a correlation between the heat diffusion pathways and the known allosteric communication pathways in proteins. Allosteric communication in proteins is a central, yet unsolved, problem in ...
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(MDPI, 2021)Changes in the level of hydrogen peroxide (H2O2) is a good indicator to monitor fluctuations in cellular metabolism and in the stress responses. In this study, the changes in H2O2 content during bud endodormancy (ED) and ...
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(American Chemical Society, 2016-10-20)The potential and properties of palladium hollow nano particles (hNPs) as a possible H storage material are explored by means of classical molecular dynamics (MD) simulations. First, we study the stability of pure Pd hNPs ...
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(Sociedad Chilena de Quimica, 2011)The crystal structure of ethyl 7-hydroxy-2-oxo-2H-chromene-3-carboxylate monohydrate (1), C12H10O5.H2O, was established by X-ray crystallographic analysis. The molecule of the title compound is essentially planar except ...
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(1992)Hydrolysis of geranyl diphosphate (GPP) at pH 7 in water gives largely linalool (LOH) + geraniol (GOH) in the ratio of 3:1. Added N−3 generates mixed acylic allylic azides and increases the LOH GOH ratio to 15:1 in 2 M ...
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(1983)The content of two hydroxamic acids, 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA) and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA), in cultivated and wild species of Gramineae was determined. Zea mays and Triticum ...
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(1991)Ninety-four accessions of perennial Triticeae were examined for content of the hydroxamic acids DIBOA and DIMBOA. Levels of DIBOA (up to 44 mmolkg-1 fr. wt) were higher than those of DIMBOA (up to 4.5 mmol kg-1 fr.wt). The ...
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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 ...
