Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 44001-44020 of 98886
-
(Blackwell Munksgaard, 1998)The crystal structure of the title complex, [Ni(C3H4-N2)6]CO3.5H 2O, which is isostructural with the Cd, Co and Ru analogues, is built up from cationic and anionic sheets parallel to the basal plane of the hexagonal unit ...
-
(Elsevier Ltd, 1997)Reactions of complexes [{(η5-C5Me5)MCl2}2] (M = Rh, Ir) and [{(η6-MeC6H4Pri)RuCl 2}2] with the ligand Ph2PCH2SPh in acetone solution led to neutral complexes with the general formula [(ring)MCl2(η1-Ph2PCH2SPh-P)] (1-3). ...
-
(Allen Press Inc., 1999)We determined non-shivering thermogensis (NST) and maximum metabolic rate (MMR) as functions of thermal acclimation in a small mammal species in a seasonal environment. We studied the rodent Phyllotis xanthopygus (Muridae) ...
-
(Kluwer Academic Publishers-Plenum Publishers, 1991)Hydroxamic acids (Hx) produced by some cereal crops have been associated with allelopathy. However, the release of Hx to the soil by the producing plant-an essential condition for a compound to be involved in allelopathy-has ...
-
(Marcel Dekker Inc., 1996)The electronic absorption charge transfer bands in a series of para-substituted benzalketones are analyzed in order to stablish the role of the electron-donor substituent as well as the electronic properties of the molecular ...
-
Diurnal changes in zooplankton respiration rates and the phytoplankton activity in two Chilean lakes (Kluwer Academic Publishers, 1989)Respiration rates of natural zooplankton communities were measured for diel cycles in two lakes. Distinct diurnal cycles were observed in Embalse Rapel with high respiratory rates for the spring cladoceran dominated ...
-
HSAB analysis of charge transfer in the gas-phase acid-base equilibria of alkyl-substituted alcohols (American Chemical Society, 1999)A simple model to analyze charge redistribution associated with proton transfer (PT) reaction is derived from a classical ion transport model. The model is applied to the gas-phase acid-base equilibria of alkyl alcohols. ...
-
(1992)The results of an investigation of the infrared spectra of mono(diethylenetriamine)copper(II) compounds are reported, with particular reference to the low-energy region. Most assignments are based on the available literature. ...
-
(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 ...
-
(Amer Inst Physics, 1987)The gravitational field equations for a spherical symmetric perfect fluid are completely solved. The general analytical solution obtained depends on an arbitrary function of the radial coordinate. As illustrations of the ...
-
(1977)An experimental technique was devised to measure the maximum binding ability (MBA) of any macromolecule having electron donor groups. It is a dialysis technique wherein polymer portions are isolated in dialysis bags and ...
-
Partial purification and characterization of a hydroxamic acid glucoside β-d-glucosidase from maize (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 ...
-
(1977)The role of naturally-occurring soil organic matter (SOM) in the translocation of metal ions from parent materials to biological systems is discussed. To explain the movement of essential elements, a hypothesis or model ...
-
(2000)A new formula for the conserved charges in 3+1 gravity for spacetimes with local anti-de Sitter asymptotic geometry is proposed. It is shown that requiring the action to have an extremum for this class of asymptotia sets ...
-
(American Chemical Society, 1997)Various density functionals have been tested in calculating atomic and molecular dipole polarizabilities. For atoms, it has been found that the results are not competitive with more sophisticated ab initio methods. Exchange ...
-
(1984)As part of a systematic chemical investigation of Chilean Compositae (1-3), we examined the secondar chemistry of a member of the genus Gochnatia (tribe Mutisieae, subtribe Gochnatiinae): Gochnatia foliosa var. fscicularia ...
-
(1996)Aldol reactions lithium alkyl acetates (LiCRR″CO2R′) with (RS)-2-(p-tolylsulfinyl)cyclohexanone (1) (as an epimeric mixture at C-2) take place with very efficient control of the configuration at the tertiary hydroxylic ...
-
(1998)We study the dependence of the intramolecular M I-M I interaction on electron correlation effects in eight-membered rings of type [M 2(PH 2CH 2PH 2) 2] 2+, [M 2(NHCHNH) 2], [M 2(SCHS) 2] (M = Au, Ag, Cu), [Au 2(PH 2CH 2PH ...
-
(1984)The indole bases N∞-methyltryptamine, 5-methoxy-N, N-dimethyltryptamine, 3-N,N-dimethylaminomethylindole (gramine) and 5-methoxytryptamine decreased survival of nymphs of Rhopalosiphum maidis with LD50 of 3.8, 3.5, 2.9 and ...
