Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 42921-42940 of 97873
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(1990)Two new ent-labdanes were isolated from the leaves of Baccharis paniculata. The results of a chemical study of other three Baccharis species are reported. © 1990.
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(Elsevier GmbH, 2004)
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(2005)We give a characterization of the representations on train algebras of rank 3. We prove that the subalgebra of the algebra of endomorphisms of a module generated by the representation of the nil ideal of the algebra is ...
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(American Institute of Mathematical Sciences, 2018)© 2018 American Institute of Mathematical Sciences. All rights reserved. We study a chemostat model with an arbitrary number of competing species, one substrate, and constant dilution rates. We allow delays in the growth ...
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(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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(2004)We study all-optical switching based on the dynamic properties of discrete vector solitons in waveguide arrays. We employ the concept of polarization mode instability and demonstrate simultaneous switching and amplification ...
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(2003)C17H13NO3, orthorhombic, P21nb (No. 33), a = 8.7927(8) Å, b = 30.165(2) Å,c = 4.9136(6) Å, K= 1303.2 Å3,Z= 4, Rgt(F) = 0.053, wRref(F2) = 0.161, T = 293 K. © 2014, Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, ...
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(2005)C15H22O2, monoclinic, C121 (no. 5), a = 18.623(4) Å, b = 9.702(2) Å,c = 7.770(2) Å, β = 98.19(3)°, V= 1389.6 Å3, Z = 4, Rgt(F) = 0.058, wRref(F2) = 0.133, T= 293 K. © 2014, Oldenbourg Wissenschaftsverlag München. All rights ...
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(2000)The products 3-hydroxy-1,4-benzoxazin-2-one (5) and 5-nitro-2-aminophenol were isolated from the decomposition reaction of the title compounds in aqueous solutions. Two mechanisms are proposed for the formation of these products.
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(1993)The influence of three physiological factors related to triploid production was examined for rainbow trout. Individual spawnings of 46 females were used to perform triploid production experiments from 1989 to 1991, with ...
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(Elsevier, 1996)FT-IR spectra of the title compounds and derivatives were measured in the range 4000-120 cm-1. A complete experimental spectral assignment has been performed. A simplified normal coordinate treatment orientates some ...
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(Kluwer Academic Publishers, 1986)The synthesis, characterization and electrochemical behaviour of a new series of copper(II) complexes derivated from substituted anilines and bromosalicylaldehydes have been studied. The complexes show a square-plane ...
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(1997)We report the reaction of gallic acid with chloroacetic acid and three equivalents of sodium hydroxide. In this reaction, 2,6-dihydroxy-4-carboxyphenoxyacetic acid (A) is produced instead of 2,3-dihydroxy-5-carboxyphenoxyacetic ...
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(1996)Stepwise instability constants of the cuprous complex of the title was determined by spectrophotometric method at different temperatures in dimethylsulfoxide. A comparative study between thermodynamic functions in the ...
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(Springer-Verlag, 1985)In recent years there has been an increasing interest in the study of interpolation procedures preserving some shape defined in the form of a convex constraint, such as: monotonicity, positivity and convexity. In a recent ...
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(1988)Ten Δ5-sterols, making up 77% of the total fraction, and seven 5α-stanol derivatives were identified from the sponge Iophon proximun. The pattern is similar to that found in related sponges. © 1988.
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(1998)Fatty acids and sterols have been isolated and identified from the Chiloé sponges lophon proximum (Ridley 1881) and lophon sp. The structures of these compounds were established by means of spectroscopic evidence and ...
