oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 1 )

2018 ( 7 )

2017 ( 14 )

2016 ( 14 )

Custom range...

Search Results: 1 - 10 of 6896 matches for " Flor Mena Martinez "
All listed articles are free for downloading (OA Articles)
Page 1 /6896
Display every page Item
OCCASIONAL PHRASEOLOGICAL SYNONYMY
Flor Mena Martinez
International Journal of English Studies (IJES) , 2006, DOI: 10.6018/ijes.6.1.46901
Abstract: Just from one type of formal modification, i.e. lexical substitution, various semantic relationships between the the original phraseological unit (PhU) and the modified occurrence (MPhU) can be derived. We cannot rely on the semantic connection between the elements which take part in the substitution to describe and identi@ this semantic link. This is so because many times there is no semantic connection between the lexemes involved in the process. The key to interpret the kind of semantic relationship has to be extracted from the contextual clues. Following a cognitive approach, the purpose of this paper is doublefold. First, we focus on the analysis of one type of semantic relation, the synonymy, of creative variations of proverbs; and second, we check the validity of the cognitive approach to identify the procedures, transformations and changes which take part in the process of formal modification which ends in the generation of a synonymous paremiological unit.
Atmospheric neutrinos in ice and measurement of neutrino oscillation parameters
Enrique Fernandez-Martinez,Gerardo Giordano,Olga Mena,Irina Mocioiu
Physics , 2010, DOI: 10.1103/PhysRevD.82.093011
Abstract: The main goal of the IceCube Deep Core Array is to search for neutrinos of astrophysical origins. Atmospheric neutrinos are commonly considered as a background for these searches. We show that the very high statistics atmospheric neutrino data can be used to obtain precise measurements of the main oscillation parameters.
The dark side of curvature
G. Barenboim,E. Fernandez-Martinez,O. Mena,L. Verde
Physics , 2009, DOI: 10.1088/1475-7516/2010/03/008
Abstract: Geometrical tests such as the combination of the Hubble parameter H(z) and the angular diameter distance d_A(z) can, in principle, break the degeneracy between the dark energy equation of state parameter w(z), and the spatial curvature Omega_k in a direct, model-independent way. In practice, constraints on these quantities achievable from realistic experiments, such as those to be provided by Baryon Acoustic Oscillation (BAO) galaxy surveys in combination with CMB data, can resolve the cosmic confusion between the dark energy equation of state parameter and curvature only statistically and within a parameterized model for w(z). Combining measurements of both H(z) and d_A(z) up to sufficiently high redshifts around z = 2 and employing a parameterization of the redshift evolution of the dark energy equation of state are the keys to resolve the w(z)-Omega_k degeneracy.
Neutrino Probes of the Nature of Light Dark Matter
Sanjib K. Agarwalla,Mattias Blennow,Enrique Fernandez Martinez,Olga Mena
Physics , 2011, DOI: 10.1088/1475-7516/2011/09/004
Abstract: Dark matter particles gravitationally trapped inside the Sun may annihilate into Standard Model particles, producing a flux of neutrinos. The prospects of detecting these neutrinos in future multi-\kton{} neutrino detectors designed for other physics searches are explored here. We study the capabilities of a 34/100 \kton{} liquid argon detector and a 100 \kton{} magnetized iron calorimeter detector. These detectors are expected to determine the energy and the direction of the incoming neutrino with unprecedented precision allowing for tests of the dark matter nature at very low dark matter masses, in the range of 5-50 GeV. By suppressing the atmospheric background with angular cuts, these techniques would be sensitive to dark matter - nucleon spin dependent cross sections at the fb level, reaching down to a few ab for the most favorable annihilation channels and detector technology.
Epidemiología de las intoxicaciones en Chile: una década de registros
Mena H,Cristián; Bettini S,Marli; Cerda J,Patricia; Concha S,Flor; Paris M,Enrique;
Revista médica de Chile , 2004, DOI: 10.4067/S0034-98872004000400013
Abstract: background: the existence of poison centers for management and prevention of intoxications has been endorsed by the international experience. in chile, the toxicological information center at the pontifical catholic university of chile has been active since 1992, receiving about 130.000 calls until 2002. aim: to analyze the statistical data gathered throughout the first ten years of our research center. to delineate the epidemiological pa-ttern of intoxications in chile. material and methods: retrospective study in which records from calls for toxicological information received during the 1992-2002 period reviewed. analyzed data were total calls per year, place of call, exposure circumstances, age, sex, route of exposure and involved agents. results: 96,468 calls analyzed. the main exposure circumstance was ?unintentional? (78.6%), followed by ?intentional? (16.9%). intoxications in children under 5 years old motivated 50% of calls. according to route of exposure, ingestions involved 75,992 calls (78.8%). medications were the most common substances, accounting for 49.2% of calls, followed by cleaning products (12.1%), pesticides (11.3%), industrial and chemical products (10.5%) and cosmetics (2.7%). medications acting on the cns were the most recurrent, with 19,096 reports. conclusions: the epidemiological pattern for intoxications in chile is very si-milar to that reported in developed and other latin american countries. children under 5 years old, are a high risk group for intoxications. it is imperative to improve the recording and follow-up of patients that call to the center, to improve epidemiological data of intoxications in chile (rev méd chile 2004; 132: 493-9)
Epidemiología de las intoxicaciones en Chile: una década de registros Epidemiology of intoxications in Chile: ten years of registry
Cristián Mena H,Marli Bettini S,Patricia Cerda J,Flor Concha S
Revista médica de Chile , 2004,
Abstract: Background: The existence of Poison Centers for management and prevention of intoxications has been endorsed by the international experience. In Chile, the Toxicological Information Center at the Pontifical Catholic University of Chile has been active since 1992, receiving about 130.000 calls until 2002. Aim: To analyze the statistical data gathered throughout the first ten years of our Research Center. To delineate the epidemiological pa-ttern of intoxications in Chile. Material and methods: Retrospective study in which records from calls for toxicological information received during the 1992-2002 period reviewed. Analyzed data were total calls per year, place of call, exposure circumstances, age, sex, route of exposure and involved agents. Results: 96,468 calls analyzed. The main exposure circumstance was unintentional (78.6%), followed by intentional (16.9%). Intoxications in children under 5 years old motivated 50% of calls. According to route of exposure, ingestions involved 75,992 calls (78.8%). Medications were the most common substances, accounting for 49.2% of calls, followed by cleaning products (12.1%), pesticides (11.3%), industrial and chemical products (10.5%) and cosmetics (2.7%). Medications acting on the CNS were the most recurrent, with 19,096 reports. Conclusions: The epidemiological pattern for intoxications in Chile is very si-milar to that reported in developed and other Latin American countries. Children under 5 years old, are a high risk group for intoxications. It is imperative to improve the recording and follow-up of patients that call to the Center, to improve epidemiological data of intoxications in Chile (Rev Méd Chile 2004; 132: 493-9)
Phosphorylation Controls the Localization and Activation of the Lumenal Carbonic Anhydrase in Chlamydomonas reinhardtii
Amaya Blanco-Rivero, Tatiana Shutova, María José Román, Arsenio Villarejo, Flor Martinez
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0049063
Abstract: Background Cah3 is the only carbonic anhydrase (CA) isoform located in the thylakoid lumen of Chlamydomonas reinhardtii. Previous studies demonstrated its association with the donor side of the photosystem II (PSII) where it is required for the optimal function of the water oxidizing complex. However this enzyme has also been frequently proposed to perform a critical function in inorganic carbon acquisition and CO2 fixation and all mutants lacking Cah3 exhibit very poor growth after transfer to low CO2 conditions. Results/Conclusions In the present work we demonstrate that after transfer to low CO2, Cah3 is phosphorylated and that phosphorylation is correlated to changes in its localization and its increase in activity. When C. reinhardtii wild-type cells were acclimated to limiting CO2 conditions, the Cah3 activity increased about 5–6 fold. Under these conditions, there were no detectable changes in the level of the Cah3 polypeptide. The increase in activity was specifically inhibited in the presence of Staurosporine, a protein kinase inhibitor, suggesting that the Cah3 protein was post-translationally regulated via phosphorylation. Immunoprecipitation and in vitro dephosphorylation experiments confirm this hypothesis. In vivo phosphorylation analysis of thylakoid polypeptides indicates that there was a 3-fold increase in the phosphorylation signal of the Cah3 polypeptide within the first two hours after transfer to low CO2 conditions. The increase in the phosphorylation signal was correlated with changes in the intracellular localization of the Cah3 protein. Under high CO2 conditions, the Cah3 protein was only associated with the donor side of PSII in the stroma thylakoids. In contrast, in cells grown at limiting CO2 the protein was partly concentrated in the thylakoids crossing the pyrenoid, which did not contain PSII and were surrounded by Rubisco molecules. Significance This is the first report of a CA being post-translationally regulated and describing phosphorylation events in the thylakoid lumen.
Malária em mulheres de idade de 10 a 49 anos, segundo o SIVEP- Malária, Manaus, Amazonas, 2003-2006
Almeida, Lesliane Balbino de;Barbosa, Maria das Gra?as Vale;Martinez-Espinosa, Flor Ernestina;
Revista da Sociedade Brasileira de Medicina Tropical , 2010, DOI: 10.1590/S0037-86822010000300018
Abstract: introduction: the sivep-malaria epidemiological surveillance information system has been in use for notification of malaria cases diagnosed in brazil since 2003. this study analyzed malaria cases notified among women aged 10 to 49 years between 2003 and 2006, according to the presence or absence of pregnancy. methods: authorization to evaluate the data was requested from the health surveillance foundation (fvs). results: over this period, 13,308 malaria cases were notified, of which 815 (6.1%) were among pregnant women. there was a gradual decrease in the absolute numbers of cases among pregnant and non-pregnant women. regarding species, 14.3% of the notified cases were caused by plasmodium falciparum; 85% by plasmodium vivax and 0.6 % by both of them. the frequency of plasmodium falciparum infection was greater among pregnant women than among non-pregnant women (p > 0.05). although most of the cases lived in the eastern zone of the city, the western zone appeared to be the likely location of infection in 39% of the cases. endemic peaks of malaria in july and august were observed among the non-pregnant women in all four years analyzed. conclusions: the data showed that sivep-malaria was an important tool for determining the distribution of malaria cases and that it should be used for controlling the endemic disease. however, the data from its first four years of operation showed that the quality was compromised by data entry failures, using the field of notification of pregnancy as an example.
Topographical Organization of the Pedunculopontine Nucleus
Cristina Martinez-Gonzalez,J. Paul Bolam,Juan Mena-Segovia
Frontiers in Neuroanatomy , 2011, DOI: 10.3389/fnana.2011.00022
Abstract: Neurons in the pedunculopontine nucleus (PPN) exhibit a wide heterogeneity in terms of their neurochemical nature, their discharge properties, and their connectivity. Such characteristics are reflected in their functional properties and the behaviors in which they are involved, ranging from motor to cognitive functions, and the regulation of brain states. A clue to understand this functional versatility arises from the internal organization of the PPN. Thus, two main areas of the PPN have been described, the rostral and the caudal, which display remarkable differences in terms of the distribution of neurons with similar phenotype and the projections that originate from them. Here we review these differences with the premise that in order to understand the function of the PPN it is necessary to understand its intricate connectivity. We support the case that the PPN should not be considered as a homogeneous structure and conclude that the differences between rostral and caudal PPN, along with their intrinsic connectivity, may underlie the basis of its complexity.
Asymmetric Dark Matter and Dark Radiation
Mattias Blennow,Enrique Fernandez-Martinez,Olga Mena,Javier Redondo,Paolo Serra
Physics , 2012, DOI: 10.1088/1475-7516/2012/07/022
Abstract: Asymmetric Dark Matter (ADM) models invoke a particle-antiparticle asymmetry, similar to the one observed in the Baryon sector, to account for the Dark Matter (DM) abundance. Both asymmetries are usually generated by the same mechanism and generally related, thus predicting DM masses around 5 GeV in order to obtain the correct density. The main challenge for successful models is to ensure efficient annihilation of the thermally produced symmetric component of such a light DM candidate without violating constraints from collider or direct searches. A common way to overcome this involves a light mediator, into which DM can efficiently annihilate and which subsequently decays into Standard Model particles. Here we explore the scenario where the light mediator decays instead into lighter degrees of freedom in the dark sector that act as radiation in the early Universe. While this assumption makes indirect DM searches challenging, it leads to signals of extra radiation at BBN and CMB. Under certain conditions, precise measurements of the number of relativistic species, such as those expected from the Planck satellite, can provide information on the structure of the dark sector. We also discuss the constraints of the interactions between DM and Dark Radiation from their imprint in the matter power spectrum.
Page 1 /6896
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.