Browsing by Title Facultad de Ciencias
Now showing items 5207-5226 of 8177
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(Elsevier, 2013)The Morse–Sard theorem states that the set of critical values of a Ck smooth function defined on a Euclidean space Rd has Lebesgue measure zero, provided k ≥ d. This result is hereby extended for (generalized) critical ...
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(BLACKWELL, 2007-03-20)The polychlorinated biphenyl (PCB)-degrading Pseudomonas sp. B4 was tested for its motility and ability to sense and respond to biphenyl, its chloroderivatives and chlorobenzoates in chemotaxis assays. Pseudomonas sp. ...
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(American Dental Education Association, 2019)Since the motivation to study and engage in academic activities plays a key role in students' learning experience and well-being, gaining a better understanding of dental students' motivations can help educators implement ...
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(Universidad de Chile, 2009)Las bacteriocinas son antibióticos de naturaleza peptídica producidas por un amplio espectro de bacterias Gram positiva y negativa. La microcina E492 (MccE492) es una bacteriocina formadora de poros producida por Klebsiella ...
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(1998)Ion channels lie at the heart of gamete signaling. Understanding their regulation will improve our knowledge of sperm physiology, and may lead to novel contraceptive strategies. Sperm are tiny (~ 3 μm diameter) and, until ...
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(Universisdad de Chile, 2007)Las células troncales mesenquimaticas (MSC) se caracterizan por ser indiferenciadas, multipotentes, capaces de dar origen a linajes celulares de estirpe mesenquimatico como adipocitos, condrocitos y osteoblastos; pero ...
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(Universisdad de Chile, 2003)A diferencia de los animales las plantas no pueden desplazarse para responder a los estímulos que constantemente reciben del entorno. No obstante, las plantas han desarrollado numerosos procesos a nivel celular que buscan ...
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(Universidad de Chile., 2011)El exito de las plantas parasitas puede ser afectado indirectamente por la especie hospedera. En el Santuario de la Naturaleza Yerba Loca, al oriente de Santiago, la planta hemiparasitaria Tristerix verticillatus (Loranthaceae) ...
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(Universidad de Chile, 1966)
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(Universidad de Chile, 2011)
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(Universidad de Chile, 2023)La muda, el reemplazo de plumas, corresponde a un estado de historia de vida crucial para la supervivencia de las aves en el largo plazo. Altamente demandante, la expresión y desarrollo de la muda depende de una alta ...
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(Universidad de Chile, 2008)
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(MDPI AG, 2019)Extracts of bled resin from Azorella compacta, of the Azorelloideae family from the Andes (>4000 m), were analyzed by gas chromatography-mass spectrometry. The mass spectra of the dominant compounds of the resin and its ...
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(2004)Two mulinane-type diterpenoids were isolated from Azorella compacta; namely 20-hydroxymulin-11,13-dienyl acetate and 13,14-dihydroxymulin-11-en-20-oic acid. The structures were elucidated by analysis of their spectroscopic ...
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(2000)In addition to the known mulinolic acid and mulin-11, 13-dien-20-oic acid, 13-epimulinolic acid has been isolated from the aerial parts of Laretia acaulis (Cav.) Gill et Hook (Umbelliferae). Its structure was based on ...
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(MDPI AG, 2019)Mulinum crassifolium Phil. (Apiaceae) is an endemic shrub from Chile commonly used as infusion in traditional medicine to treat diabetes, bronchial and intestinal disorders and stomach ailments, including ulcers. From the ...
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(Interciencia, 2015)This paper reports on an unknown yellowish mineral compound found in an archaeological context from Chorrillos cemetery (Calama, Chile) dating to the Early Formative period (800 - 200 B.C.). We used optic microscopy, SEM, ...
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(2003)We present an approach to the construction of action principles (the inverse problem of the calculus of variations), for first order (in time derivatives) differential equations, and generalize it to field theory in order ...
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(Elsevier Masson SAS, 1998)In this paper we consider the study of standing wave solutions for a nonlinear Schrödinger equation. This problem reduces to that of finding nonnegative solutions of ε2Δu - V (x) u + (Latin small letter esh) (u) = 0 in Ω. ...
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(OXFORD UNIV PRESS, 2006-07)Background and Aims Post-dispersal seed predation in alpine communities has received little attention despite evidence that seeds removed by granivores can decrease plant recruitment into ecosystems. Moreover, few studies ...