Montes C.,NASA |
Rutllant J.A.,Católica del Norte University |
Rutllant J.A.,University of Chile |
Aguirre A.,University of Aconcagua |
And 2 more authors.
Journal of Applied Meteorology and Climatology | Year: 2016
The terral de Vicuña is a warm and dry wind that flows down the Elqui Valley in north-central Chile typically at dawn and early morning. Given that most terral episodes occur in austral winter when chill accumulation by deciduous fruit trees proceeds, negative effects on agriculture may be expected. During 11 (2004-14) winters a meteorological characterization of terral winds and the assessment of their impact on chill accumulation, by the modified Utah Model and the Dynamic Model, were performed. Within this period, 67 terral days (TD) were identified as those in which nighttime to early morning wind direction and speed, air temperature, and relative humidity reached defined thresholds on an hourly basis (terral hours). Most frequent TD featured 6-9 consecutive terral hours; duration is considered here as a proxy for their intensity. Synoptic-scale meteorological analysis shows that 65% of moderate and strong terral events develop as a cold, migratory anticyclone drifts poleward of the study area, coinciding with the onset of a midtropospheric ridge over central Chile, bringing southwest winds on top of the Andes (~500-hPa level). The remaining 35% are either associated with 500-hPa easterlies (foehn like), with prefrontal conditions ahead of a trough driving northwest 500-hPa winds, or with transitional 500-hPa westerlies. Assessments of chill accumulation during TD show that, although present average and cold winter conditions do not represent a major TD hazard to local agriculture, lower chill accumulation associated with anomalously high nocturnal temperatures could be significantly more important during present and future warmer winters. © 2016 American Meteorological Society.
de los Paramo M.A.,University of Aconcagua
Revista Argentina de Clinica Psicologica | Year: 2011
The principal objective of this study is to analyze the meanings of the adolescence, psychologist profile and psychotherapy for adolescents, trough focal groups with adolescents (15-20 years old, both genders), parents, teachers, and psychologists. The methodology was of qualitative nature, with a narrative design. The sampling methods were deliberately no probabilistic. The analysis of the textual data was made through the Content Analysis technique. The discussion was considered in terms of adolescence and psychotherapy. © 2011 Fundación AIGLÉ.
de los Angeles Paramo M.,University of Aconcagua
Terapia Psicologica | Year: 2011
In this study, the risk and protective factors in adolescence were analized. The methodology was of qualitative nature, with a narrative design. The sampling methods were deliberately no probabilistic. The information was obtained through discussion groups with adolescents, parents, teachers, and psychologists. The analysis of the data was made through the Content Analysis technique. The discussion was considered in terms of adolescence and factors of risk and protection. © 2011 Sociedad Chilena de Psicología Clínica.
Saez Lancellotti T.E.,National University of Cuyo |
Saez Lancellotti T.E.,University of Aconcagua |
Boarelli P.V.,National University of Cuyo |
Monclus M.A.,National University of Cuyo |
And 8 more authors.
PLoS ONE | Year: 2010
Hypercholesterolemia represents a high risk factor for frequent diseases and it has also been associated with poor semen quality that may lead to male infertility. The aim of this study was to analyze semen and sperm function in diet-induced hypercholesterolemic rabbits. Twelve adult White New Zealand male rabbits were fed ad libitum a control diet or a diet supplemented with 0.05% cholesterol. Rabbits under cholesterol-enriched diet significantly increased total cholesterol level in the serum. Semen examination revealed a significant reduction in semen volume and sperm motility in hypercholesterolemic rabbits (HCR). Sperm cell morphology was seriously affected, displaying primarily a ''folded head''- head fold along the major axe-, and the presence of cytoplasmic droplet on sperm flagellum. Cholesterol was particularly increased in acrosomal region when detected by filipin probe. The rise in cholesterol concentration in sperm cells was determined quantitatively by Gas chromatographic-mass spectrometric analyses. We also found a reduction of protein tyrosine phosphorylation in sperm incubated under capacitating conditions from HCR. Interestingly, the addition of Protein Kinase A pathway activators -dibutyryl-cyclic AMP and iso-butylmethylxanthine- to the medium restored sperm capacitation. Finally, it was also reported a significant decrease in the percentage of reacted sperm in the presence of progesterone. In conclusion, our data showed that diet-induced hypercholesterolemia adversely affects semen quality and sperm motility, capacitation and acrosomal reaction in rabbits; probably due to an increase in cellular cholesterol content that alters membrane related events. © 2010 Saez Lancellotti et al.
Cabrillana M.E.,National University of Cuyo |
Cabrillana M.E.,University of Aconcagua |
Monclus M.A.,National University of Cuyo |
Monclus M.A.,University of Aconcagua |
And 10 more authors.
Cytoskeleton | Year: 2011
Mammalian sperm proteins undergo thiol group (SH) oxidation to form disulfides bonds (S-S) as they travel through the epididymis during cell maturation. Disulfide bonds are involved in chromatin condensation and tail organelle stabilization. In this work, we used a fluorescent thiol-selective labeling agent, monobromobimane (mBBr), to study the protein thiol status of rat sperm during maturation. Fluorescence signal decrease along the epididymal trip, more evidently in the head, but also in the tail, indicates that both sub cellular regions participate in the thiol changes. The sources of the fluorescence signal are sulfhydryls sperm proteins labeled by mBBr (mBBr-spp). Initial attempts to identify the mBBr-spp labeled were detected in the initial-caput, but not in the distal cauda-segment of the epididymis in sodium dodecyl sulfate (SDS)-PAGE analysis. This phenomenon could be due to protein resistance to solubilization. For this reason, disulfide bond reduction was accomplished by sodium dodecyl sulfate plus dithiothreitol treatment to recover the mBBr signal in SDS-PAGE. Under this protocol, a major 27 kDa protein band displays a strong signal. Protein identification by mass spectrometry and sequence database searching correlated this protein with the outer dense fiber 1 (ODF1). The mBBr specifically bound to N-terminal domain cysteine of ODF1. The mBBr reduces rat sperm motility, quantitatively and qualitatively, and the effects are dose dependent, without significantly increasing the percentage of dead sperm. Thus, we found that ODF1 is highly responsible for mBBr fluorescence detection in the sperm tail, and the motility inhibition by the fluorescence marker indicates that ODF1 N-terminal domain are related to sperm motility. © 2011 Wiley-Liss, Inc.
Navarro D.,University of Aconcagua
Cuadernos de Turismo | Year: 2015
Based on available definitions of tourist resources and tourist attractions, several coincidences, excesses and omissions are identified: The functional variable and the conversion state define the difference between resources and attractions. Then, two classifications are proposed for both categories: resources (considering system approaches and UNESCO typology) and attractions (attending the assessment of its resources andrepresentations as well as the capacity or necessity of being managed). Moreover, assessment tools are propounded for both study objects in view of remarkable characteristics (for resources) and actions taken (for attractions).
Sassi P.L.,CONICET |
Taraborelli P.,CONICET |
Albanese S.,CONICET |
Gutierrez A.,University of Aconcagua
Ethology | Year: 2015
The activity rhythm of a species is ruled by internal signals as well as external factors. Among them, ambient temperature strongly influences the amount, duration, and distribution of an organism's activities throughout the day. The result is a pattern of activity that, between certain limits, can be flexible to deal with seasonal and spatial thermal heterogeneity. The range of behavioral plasticity increases with environmental variability and could be beneficial for a species' persistence under novel conditions. Thus, the goal of this study was to experimentally explore the behavioral plasticity in Phyllotis xanthopygus, a rodent species inhabiting an altitudinal gradient in the Central Andes Mountains of Argentina. In the laboratory, we assessed activity rate and pattern under different temperatures by comparing groups of individuals collected at different altitudes. All animals were acclimated to subsequent thermal treatments in a paired design. As expected, P. xanthophygus showed changes in activity under different temperatures, and animals from diverse altitudes were differently affected. In particular, animals from mid-altitudes and high altitudes reduced their activity under high temperatures. Intraspecific differences across the altitudinal gradient suggest that animals from mid-altitudes and high altitudes are less heat tolerant than those from lower sites, in spite of acclimation to equal conditions. We propose that climate ranges experienced in the field possibly promote this different response. Our results are discussed in light of recent forecasts of temperature rises in the region, which could constrain P. xanthophygus activity in space and time. © 2015 Blackwell Verlag GmbH.
Bordonaro O.L.,Centro Cientifico Tecnologico |
Pratt B.R.,University of Saskatchewan |
Robledo V.,University of Aconcagua
Geological Journal | Year: 2013
The ptychoparioid trilobite Blainia gregaria Walcott, 1916 is described for the first time from the late middle Cambrian (Series 3) of the Argentine Precordillera. It occurs commonly in the upper part of La Laja Formation, a carbonate platform succession that crops out in the Precordillera Oriental of San Juan where it reaches a thickness of some 600m. Sections were sampled on cerro Tres Marías in Sierra de Marquesado and in quebrada de Zonda at the northern termination of Sierra Chica de Zonda. More than 1200 specimens were recovered from 22 stratigraphic levels over a thickness of 155m, located in the uppermost 15m of the Soldano Member, the approximately 100m thick Rivadavia Member, and in the lower 40m of the Juan Pobre Member. Our biometric study dealt with 205 cranidia and 365 pygidia from cerro Tres Marías. Measured dimensions of a subset of this collection provide bivariate datasets that in some characters show broad scatter plots and relatively low linear correlation coefficients, indicative of rather wide intraspecific morphological variation. Six morphotypes (three cranidial and three pygidial), recognized mainly on the basis of shape, occur together in the same collections. This evidence for an unusually high degree of variability leads to a proposed synonymy of some 30 previously named species in North America belonging to two genera, Blainia Walcott, 1916 and Glyphaspis Poulsen, 1927, the latter considered a junior synonym. The biogeographic distribution of B. gregaria, as redefined here, shows that it was an endemic Laurentian species that inhabited the inner parts of the carbonate platform that rimmed the craton and mantled portions of its interior. Its presence in western Argentina is further evidence for the very close faunal relationship between the Precordilleran terrane, known as Cuyania, and Laurentia during the Cambrian. © 2012 John Wiley & Sons, Ltd.
Gomez E.E.,University of Aconcagua
Acta Colombiana de Psicologia | Year: 2012
In the present paper, the concept of incommensurability is analyzed in the light of what is happening in different disciplines related to psychology. it is detected that there are many concepts that are applied in different studies without a conceptual elaboration or re-elaboration from new attributes identified in a certain phenomenon. Sometimes it consists of merely adding together many terms; in other cases, concepts are transferred without specifying the ontology or taxonomy of which they are part. two theoretical works are described - one by castorina and the other one by Bruner - to exemplify the arguments expressed. Finally, it is argued that a certain margin of common space would exist between psychological theories, which could be represented, for example, in the resolution of "problems" (both theoretical and empirical). that is to say, a theory is valid while it is questionned by an important sector of the scientific community (mainly for research and secondarily for professional practice).
PubMed | National University of Cuyo and University of Aconcagua
Type: Journal Article | Journal: CoDAS | Year: 2016
Using a pretest and posttest comparison group design, this 20 weeks study investigated the effects of a phonological awareness training program (PATP) on attention efficiency (AE) in 57 children (age = 5 to 6 years) at risk. The experimental group received the PATP (EG; n=30). We obtained pretest and posttest measures of phonological awareness and AE. The ANOVA showed significant interaction effects of the PATP and time on phonological awareness and AE. For both groups, posttest AE score means were higher than pretest score means. Pretest measures showed that the AE score mean for the EG was lower than that for the Control Group (CG; n=31); whereas posttest data showed no between group differences. Contrast analysis showed that the EG gained a greater level of phonological awareness ability and AE over CG. Our results indicate that childrens attention efficiency not only improved as they developed, but also increased by means of a PATP.