Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 43901-43920 of 98913
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(1993)Oligosaccharides of different sizes were released from intact Citrus limon seedlings treated with endopolygalacturonase obtained from Alternaria alternata. Also, an increase of phenylalanine ammonia lyase (PAL) activity ...
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(1992)The ordering behaviour in quenched αCu-Al was investigated by differential scanning calorimetry (DSC) under rising temperature conditions and by electron diffraction. It was found that the ordering processes can be better ...
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Free energies of transfer of anions from water to cationic micelles from ionic exchange measurements (1981)Ionic exchanges for several anions in hexadecyltrimethylammonium (CTA) have been measured by ultrafiltration and by the shift in the concentration of ferric thiocyanate complex by CTA addition. The results are compared ...
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(1989)Many natural phenomena are governed by nonlinear recursive relations of the type xt+1=f(xt), where f does depend on t. We focus our interest on the particularly simple case xt+1=rtxt(1-xt), where rt adopts either periodically ...
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(1993)A new (non-Noetherian) symmetry transformation for the small oscillations problem is exhibited. A novel way to solve this classical problem, based on conservation laws constructed using the new symmetry, is presented. ...
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(R. Oldenbourg Verlag GmbH, 2003)KSbP2S6, monoclinic, P121 1 (No. 4), a = 6.605(1) Å, b = 7.651 (2) Å, c = 9.754(2) Å, β= 92.11 (3)°, V = 492.6 Å3, Z = 2, Rgt(F) = 0.018, wARref(F2) = 0.044, T= 293 K. © by Oldenbourg Wissenschaftsverlag.
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(1989)DIMBOA (2,4-dihydroxy-7-methoxy- 1,4-benzoxazin-3-one was found in nymphs of the aphids Metopolophium dirhodum and Sitobion avenae which had fed on DIMBOA-containing wheat seedlings and artificial diets. DIMBOA levels found ...
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(1990)Ab initio torsional potential functions for a series of representative sulphur-containing molecules are presented. A few interesting parameters determining the relevant characteristics of the intermediate conformations ...
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(1987)The ground state potential energy curves of alkali (LiH to CsH) and alkaline-earth monohydrides (BeH to BaH) have been calculated. A pseudopotential formalism including a core-polarization potential has been used. For the ...
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(1991)The aerial parts of Polyachyrus sphaerocephalus gave seven new eudesmane derivatives and a germacra-dien-diol while a reinvestigation of P. fuscus afforded a new caryophyllene, two nerolidolglycosides, a curcumene and two ...
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(Marcel Dekker Inc., 1997)Para-benzylideneacetones present a characteristic long distance charge transfer pattern, where the olefinic bridge (CH=CH) and the aromatic ring (Ph) carbon centers are perturbed according to the nature of the para-substituent ...
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(1996)A method to construct Hamiltonian theories for systems of both ordinary and partial differential equations is presented. The knowledge of a Lagrangian is not at all necessary to achieve the result. The only ingredients ...
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(R. Oldenbourg Verlag GmbH, 2003)BiKP2S6, monoclinic, P1211 (No. 4), a = 6.6200(6) Å, b = 7.4058(7) Å, c = 9.9002(9) Å, β = 92.108(1)°, V= 485.0 Å3, Z = 2, Rgt(F) = 0.027, wRref(F2) = 0.060, T = 293 K. © by Oldenbourg Wissenschaftsverlag.
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(1987)Vertical profiles of chlorophyll and phytoplankton biomass were measured in Lake Tahoe from July 1976 through April 1977. A deep chlorophyll maximum (DCM) persisted during summer and early autumn (July-October) near 100 ...
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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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(1999)Lacidipine is an antihypertensive drug that is oxidizable at the glassy carbon electrode. The voltammetric oxidation of lacidipine in aqueous-alcoholic solutions (70 + 30) produces a well-defined voltammetric peak when ...
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(1995)The efficiencies of singlet oxygen production from the singlet and triplet states of a series of anthracene derivatives in acetonitrile are reported. For anthracene and for all of the anthracene meso derivatives studied, ...
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(1996)A general theory for the spatial ordering of immobile clustered defects in irradiated materials is presented here. A vectorial form for the Fourier transforms of perturbations in the concentration of point and clustered ...
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(1994)The dinuclear complexes [(η5 C5Me5)RhCl2]2 and [(η6 C6Me6)RuCl2]2 reacted with dppmSe2 giving the cationic compounds [(η5 C5Me5)RhCl&{η2 (SePPh2)2CH2&}]+ (1) and [(η6 C6Me6)RuCl&{η2 (SePPh2)2CH2&}]+ (2), which were isolated ...
