Repositorio Académico de la Universidad de Chile: Recent submissions
Now showing items 42881-42900 of 97873
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(1965)Apyrase from potato extracts has been purified 200-fold by two different procedures; both procedures furnish an apyrase which splits ATP faster than ADP. By using P32-labeled substrates, it was possible to demonstrate that ...
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(1992)The preparation and spectroscopic properties of monometallic complexes of rhenium(I)tricarbonylbromide coordinated to 6,7-dihydrodipyrido-[2,3-b : 3′,2′-j]-1,10-phenanthroline (2-4N), 7,8-dihydro-6H-cyclohepta-[2,1-b : ...
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(Academic Press Inc., 1997)Twenty archaeological campsites intercalated between more than 30 debris flows caused by heavy rainfall events between 6200 and 3100 14C yr B.P. have recently been discovered at Quebrada Puripica in the Atacama Desert of ...
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Spectrophotometric and derivative spectrophotometric determination of iron by extraction of the ... (1989)A solvent extraction-spectrophotometric determination of microamounts of iron has been developed, based on the formation of an ion-association complex of iron(II) with 2,4,6-tris(2′-pyridyl)-1,3,5-triazine as primary ligand ...
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(1999)We have investigated the solution conformation of the functionally relevant C-terminal extremes of α- and β-tubulin, employing the model recombinant peptides RL52α3 and RL33β6, which correspond to the amino acid sequences ...
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(American Chemical Society, 1997)Natural 2-benzoxazolinones BOA and MBOA and related synthetic derivatives inhibited the growth of Staphylococcus aureus, Escherichia coli, and Candida albicans. Both the electrophilic character of the nitrogen atom of the ...
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(1996)A simple and natural approach to the single-layer homogeneous absorber problem is developed and used to calculate previously unavailable universal design curves and equations for different orders of solutions. It is shown ...
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(1998)Two new tropane alkaloids schizanthine Y and schizanthine Z have been isolated from the methanol extract of the leaves of Schizantus porrigens, in addition to the known compounds (-)-6β-angeloy-loxytropan-3α-ol and ...
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(1996)The relationship between mistletoes and birds has been studied from the perspectives of mutualism and seed dispersal. Here, we emphasize the role that avian dispersers play as agents of mistletoe seed transmission to plant ...
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(1991)From the aerial parts of Haplopappus pulchellus two new labdanes and six friedolabdanes were isolated while H. arbutoides afforded in addition to known labdanes five new ones, two clerodanes and a cyperone derivative. ...
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(1998)Fetal cystoscopy was performed in nine fetuses with sonographic evidence of lower urinary tract obstruction and normal urinary electrolytes. Posterior urethral valves (PUV) were thought to be present in all cases. Endoscopic ...
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Apyrase activity and changes in metabolites during germination and tuberization of Solanum tuberosum (1990)Levels of adenine nucleotides, inorganic phosphate, starch and apyrase were measured during the growth of Solanum tuberosum tuber. The data obtained from potatoes sown in summer were compared with the data already reported ...
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(American Institute of Physics Inc., 1998)We present the microscopic description of the vapor using the concept of cluster. Taking into consideration nonideal contributions, the distribution functions of every cluster species are obtained. From these distribution ...
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(1983)2,4‐Dihydroxy‐7‐methoxy‐1,4‐benzoxazin‐3‐one (DIMBOA), the main hydroxamic acid isolated from maize extracts, increased the mortality of Schizaphis graminum when fed in artificial diets. Electrically‐monitored feeding ...
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(1998)Studies in unpolluted, old-growth forests in the coastal range of southern Chile (42°30′S) can provide a baseline for understanding how forest ecosystems are changing due to the acceleration of nitrogen (N) inputs that has ...
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(1991)Four new alicyclic monoterpenes based on the 1-(2-chlorovinyl)-2,4,5-trichloro-1,5-dimethylcyclohexane skeleton were isolated from Plocamium cartilagineum from the Chilean coast, together with four known cyclic monoterpenes. ...
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(1989)We compare values of time obtained with linear utility functions used in LOGIT and HIERARCHICAL LOGIT specifications of a nine-mode passenger choice model estimated with disaggregate data from Santiago, Chile, and find ...
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(2005)We study resonant light scattering in arrays of channel optical waveguides in which tunable quadratic non-linearity is introduced as nonlinear defects by periodic poling of single (or several) waveguides in the array. We ...
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(1988)The aerial parts of Aphyllocladus denticulatus afforded, in addition to some widespread compounds, six 5-methylcoumarin derivatives isolated previo. © 1988.
