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Search Results: 1 - 10 of 408154 matches for " M. Teresa; "
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Intermittent-Contact Heterodyne Force Microscopy
M. Teresa Cuberes
Journal of Nanomaterials , 2009, DOI: 10.1155/2009/762016
Abstract: Heterodyne Force Microscopy opens up a way to monitor nanoscale events with high temporal sensitivity from the quasistatic cantilever mechanical-diode response taking advantage of the beat effect. Here, a novel heterodyne ultrasonic force method is proposed, in which the cantilever is driven in amplitude-modulation mode, at its fundamental flexural eigenmode. Ultrasonic vibration in the megahertz range is additionally input at the tip-sample contact from the cantilever base and from the back of the sample. The ultrasonic frequencies are chosen in such a way that their difference is coincident with the second cantilever eigenmode. In the presence of ultrasound, cantilever vibration at the difference frequency is detected. Similarly as in heterodyne force microscopy, it is expected that the phase response yields information with increased sensitivity due to the beat effect.
Phenotypic variation meets systems biology
Teresa M Przytycka
Genome Biology , 2009, DOI: 10.1186/gb-2009-10-8-313
Abstract: This year's annual growth factor and signal transduction symposium held at Iowa State University focused on systems-biology approaches to the study and modeling of complex biological processes. The topics discussed covered a wide spectrum of recent advances, including systems-level approaches to understanding transcriptional and posttranscriptional regulation and systems-level analysis and modeling of the responses of biological systems to perturbations. A few of the highlights of the meeting in these fields are reported here.Transcriptional regulation can be broadly defined as the process in which transcription factors interact with each other, with DNA, and with other biomolecules to regulate gene expression. This complex regulatory process is the subject of intensive study utilizing a variety of experimental and computational techniques. Opening the meeting, David Hume (Roslin Institute, University of Edinburgh, UK) described his recent results on gene regulation in macrophages related to the RIKEN genome Network Project and FNTOM 4 (Functional Annotation of Mammalian Genome). Hume and his collaborators analyzed transcriptional control of the human monocytic cell line THP-1 throughout a time course of growth, arrest and differentiation. Using the deepCAGE technique, they measured the dynamics of genome-wide usage of transcription start sites. This analysis was followed with comparative genomics approaches to predict active regulatory motifs throughout time and to predict the key transcription factors driving differentiation and uncover their time-dependent activation. Some of the predicted factors were subsequently confirmed by knockdowns using small interfering RNAs. Challenging the concept of 'master regulators', Hume argued that cellular states are constrained by complex networks that involve a substantial number of both positive and negative regulations.Transcriptional regulation was also the focus of Timothy Ravasi (University of California, San Diego, USA)
Functional annotation and ENU
Teresa M Gunn
BMC Research Notes , 2012, DOI: 10.1186/1756-0500-5-580
Delincuencia femenina por drogas: Una aproximación a su realidad educativa. Centro penitenciario "Región Los Andes". Mérida, Edo. Mérida. Venezuela
Salazar M,Teresa;
Educere , 2008,
Abstract: latin america is a developing region and economically dependent, together with the worldwide phenomena of drugs. our country does no escape this and some structural characteristics subsist where women develop in society. the following paper is about an aspect of the analysis of female delinquency due to drugs made in mérida (venezuela) in the “región andina” penitentiary between 2005 and 2006 about the demographical, educational, family and socio-economical characteristics of the women involved in drug-related crimes and their motivation to commit them. the aspects were tackled by a census. this is a transectional, field, descriptive and inference research. among other results a significant relation between the kind of crime according to age and education level of the mother is evidenced. regarding the motivation for the crime, the income, family and the childhood living acquaintances variables were significant.
Eyzaguirre Philippi,M. Teresa;
Gayana. Botánica , 2008, DOI: 10.4067/S0717-66432008000200012
Abstract: the collection oí alstroemeria citrina phil, in the mountains of alicahue, located in the province of petorca, region of valparaiso (november 2002), and north of pedernales in the south of the province of choapa, region of coquimbo (november 2007), is described. the last location corresponds to the site where it was first described by philippi in 1865. this plant had never been collected since.
Taxonomic position and phylogenetic relationships of the bivalve Goniophorina Isberg, 1934, and related genera from the early Ordovician of northwestern Argentina
Sánchez,Teresa M.;
Ameghiniana , 2006,
Abstract: on the basis of collections from tremadoc and arenig successions of northwestern argentina, the affinities of goniophorina isberg, 1934, are reassessed. studied material includes ucumariids, lipanellids, goniophorina , and other specimens for which the new genus lossella is proposed with the new species l . juancruzi sp. nov. as type species. goniophorina and lossella are grouped in the new family goniophorinidae. synapomorphies of goniophorinids, ucumariids, and lipanellids lead to the conclusion that goniophorina integrates a major group of edentulous bivalves, a lineage of which -the ucumariidsprobably gave rise to anomalodesmata. this fauna represents a rapid, local diversification event that is part of the west-gondwanan bivalve radiation during the early ordovician.
Heterotopy and heterochrony in the palaeotaxodont bivalve Natasia boliviensis (Babin and Branisa) from the Early Ordovician of northwestern Argentina
Sánchez,Teresa M.;
Ameghiniana , 2009,
Abstract: in the last few years several contributions concerning heterochronic processes have been produced, but only few papers dealing on heterotopy have been published. material of natasia boliviensis (babin and branisa, 1987) from the early ordovician of northwestern argentina includes specimens at different growth stages, from smaller, juvenile individuals with taxodont dentition, to larger adult shells displaying actinodont dentition. ontogenetic development of dentition is tentatively interpreted as resulting from heterotopic changes from an unknown praenuculid ancestor, whereas changes in shell outline could be explained by mean of heterochrony.
Formación de profesionales e investigación social en Latinoamérica
Pacheco Méndez, Teresa;
Sinéctica , 2010,
Abstract: up to only a few decades ago, the processes of production of the knowledge in the latin american region had been developed in a practically exclusive way in the higher education institutions, characterizing itself like a subordinated area of the science field decisions. at present, the generation of knowledge in the region has gone gradually moving towards positions that are far to reach those sectors that traditionally regulated their effect and incidence in the different strata of society. from the sociology of the institutions in this paper we discuss how this re-positioning of knowledge leads inevitably to wonder where the identity is emerging not only for higher education institutions but also for the actors who participate in it, establishing through the training and social research activities, a new ways to articulate local, regional and worldwide scopes. it is necessary to indicate that this work assembles a set of reflections ensued from research products realized during the last two decades.
Importancia de las vacunas contra los virus de las hepatitis A y B en Chile
Valenzuela B,M Teresa;
Revista médica de Chile , 2009, DOI: 10.4067/S0034-98872009000600017
Abstract: the mode of transmission and epidemiological approach for hepatitis a and b are different. however, both are preventable with vaccines whose efficacy and long lasting protection has been demonstrated. this review describes the secular tendency of both infections in chile, their risk factors that have contributed to their persistence in the country and the interventions that have been carried out to reduce the disease burden. although the vaccine for hepatitis b was incorporated to the immunization program in 2005, the vaccine for hepatitis a persists in the list of interventions that must be assumed with priority by the ministry of health. if chilean health authorities pretend to reach the enteric disease indicators of developed countries, they must accelerate the epidemiological transition towards the elimination of hepatitis a.
Préface. La terminologie dans le contexte du multilinguisme et à la défense de la diversité linguistique
M. Teresa Cabré Castellví
Synergies Espagne , 2012,
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