579 research outputs found
Ecology of Plant Communities in Central Mexico
In Central Mexico converge three biogeographic provinces: Altiplano sur, Sierra Madre Occidental and Costa del PacĂfico. Each one of them is composed by different plant communities: Thorn Forest, Temperate Mountain Forest and Dry Tropical Forest respectively. Our objective is to show, through phytoecological analysis, the species richness, diversity and the structure of the plant communities from the Temperate Mountain Forest and from the Tropical Dry Forest. In the Temperate Mountain Forest, 50 forest species were recorded, with a Shannon Wiener diversity index HÂŽÂ = 1.63 on altitudes from 2400 to 2600 m. The Whittaker ÎČ index is Bw = 7.22. In the tropical dry forest, we identified 79 plants species with a mean diversity index HÂŽÂ = 3.49 on altitudes from 1951 to 2100 m. In this ecosystem the Bw index is 8.12. This study offers important information for the establishment of management practices, considering the protection status from the areas in which this vegetation type is distributed
NGC 6705 a young -enhanced Open Cluster from OCCASO data
The stellar [/Fe] abundance is sometimes used as a proxy for stellar
age, following standard chemical evolution models for the Galaxy, as seen by
different observational results. In this work we show that the Open Cluster
NGC6705/M11 has a significant -enhancement [/Fe] dex,
despite its young age (300 Myr), challenging the current paradigm. We use
high resolution (R) high signal-to-noise (70) spectra of 8 Red
Clump stars, acquired within the OCCASO survey. We determine very accurate
chemical abundances of several elements, using an equivalent width
methodology (Si, Ca and Ti), and spectral synthesis fits (Mg and O). We obtain
[Si/Fe]=, [Mg/Fe]=, [O/Fe]=,
[Ca/Fe]= and [Ti/Fe]=. Our results place these
cluster within the group of young [/Fe]-enhanced field stars recently
found by several authors in the literature. The ages of our stars have an
uncertainty of around 50 Myr, much more precise than for field stars. By
integrating the cluster's orbit in several non-axisymmetric Galactic
potentials, we establish the M11's most likely birth radius to lie between
6.8-7.5 kpc from the Galactic center, not far from its current position. With
the robust Open Cluster age scale, our results prove that a moderate
[/Fe]-enhancement is no guarantee for a star to be old, and that not
all -enhanced stars can be explained with an evolved blue straggler
scenario. Based on our orbit calculations, we further argue against a Galactic
bar origin of M11.Comment: 10 pages, 6 figures, accepted in A&
Remesas e inclusiĂłn financiera en municipios del Noreste de MĂ©xico: Un anĂĄlisis espacio - temporal bayesiano
Este trabajo tiene por objetivo analizar la distribuciĂłn espacio-temporal de las remesas en los municipios del noreste de MĂ©xico derivada del efecto de los servicios financieros, y por tanto, se enfoca en estudiar la relaciĂłn entre el flujo de remesas y la inclusiĂłn financiera, considerando la infraestructura y red existente de servicios bancarios en los municipios de la regiĂłn, al tiempo que se argumenta que la inclusiĂłn financiera puede apoyar la acumulaciĂłn de recursos a travĂ©s del ahorro y permitir el acceso a crĂ©ditos, seguros y otro tipo de productos financieros. Los resultados muestran que la concentraciĂłn de recursos en instituciones y municipios con mayor presencia de instituciones bancarias puede, evidentemente, llevar a la expansiĂłn de pequeños negocios, a la generaciĂłn de ingresos derivados del desarrollo de micronegocios y a la inversiĂłn productiva especialmente en segmentos de bajos recursos y que esto se encuentra asociado a la recepciĂłn de remesas, asimismo se busca destacar la importancia de comprender las complejas interacciones entre la migraciĂłn internacional, las remesas y la economĂa
PĂșrpura fulminans
We repon a case of a 65 year-old woman with Purpura fulminans secondary to Disseminated Intravascular Coagulation associated to urinary sepsis. We review the associated literature.Presentamos el caso de una mujer de 65 años con PĂșrpura fulminante secundaria a CoagulaciĂłn Intravascular Diseminada asociada a sepsis urinaria. Revisamos la literatura asociada
Exercise variables and pain threshold reporting for strength training protocols in people with haemophilia: a systematic review of clinical trials
Introduction: Although strength exercise is often prescribed for people with haemophilia (PWH), it remains unknown how exercise variables and pain thresholds are used to prescribe strength training in PWH. Aim: To analyse how strength exercise variables and pain thresholds have been used to prescribe strength training in PWH. Methods: A systematic search was conducted in PubMed, Embase, Web of Science, CENTRAL and CINAHL databases from inception to 7 September 2022. Studies whose intervention included strengthening training in adults with haemophilia were included. Two independent reviewers were involved in study selection, data extraction and risk of bias assessment. Results: Eighteen studies were included. The least reported variables among the studies were: prophylactic factor coverage (11.1%), pain threshold/tolerability (5.6%), intensity (50%), total or partial range of motion (27.8%), time under tension (27.8%), attentional focus modality (0%), therapist experience in haemophilia (33.3%) and adherence assessment (50%). In contrast, weekly frequency (94.4%), duration (weeks) (100%), number of sets/repetitions (88.9%), repetitions to failure/not to failure (77.8%), types of contraction (77.8%), rest duration (55.6%), progression (55.6%), supervision (77.8%), exercise equipment (72.2%) and adverse event record (77.8%) had a higher percentage of reported (>50% of studies). Conclusion: Future research on strength training for PWH should improve information on pain threshold and other important variables such as prophylactic factor coverage, intensity, range of motion, time under tension, attentional focus modality, therapist experience in haemophilia and adherence assessment. This could improve clinical practice and comparison of different protocols
Evaluation of bacterial adherence of clinical isolates of Staphylococcus sp. using a competitive model: An in vitro approach to the "race for the surface" theory
Objectives Implant-related infection is one of the most devastating complications in orthopaedic surgery. Many surface and/or material modifications have been developed in order to minimise this problem; however, most of the in vitro studies did not evaluate bacterial adhesion in the presence of eukaryotic cells, as stated by the 'race for the surface' theory. Moreover, the adherence of numerous clinical strains with different initial concentrations has not been studied. Methods We describe a method for the study of bacterial adherence in the presence of preosteoblastic cells. For this purpose we mixed different concentrations of bacterial cells from collection and clinical strains of staphylococci isolated from implant-related infections with preosteoblastic cells, and analysed the minimal concentration of bacteria able to colonise the surface of the material with image analysis. Results Our results show that clinical strains adhere to the material surface at lower concentrations than collection strains. A destructive effect of bacteria on preosteoblastic cells was also detected, especially with higher concentrations of bacteria. Conclusions The method described herein can be used to evaluate the effect of surface modifications on bacterial adherence more accurately than conventional monoculture studies. Clinical strains behave differently than collection strains with respect to bacterial adherence.This work was funded by the following grants from the Spanish MINECO (MAT2013-
48224-C2-2-R and MAT2013-48224-C2-1-R).
M. MartĂnez-PĂ©rez reports funding received from EFORT 2015 congress: travel supported
by PFIZER, which is related to this article. J. Esteban and E. GĂłmez-Barrena report funding received from several companies
for travel, expenses and grants, none of which is related to this articl
Ensayo de un pronóstico numérico para la Argentina
La aplicaciĂłn del pronĂłstico numĂ©rico en la Argentina encuentra el problema de los datos bĂĄsicos para el anĂĄlisis del estado inicial. En este trabajo se realiza un ensayo basado en el anĂĄlisis de los datos convencionales y en las imĂĄgenes de los campos nubosos proporcionados por la EstaciĂłn Receptora APT en Ezeiza. Para ello se ha empleado un modelo baroclĂnico de dos capas y se ha extendido el pronĂłstico hasta un tĂ©rmino de 24 horas. El resultado muestra que, aun con los datos disponibles en este momento, es posible encarar el pronĂłstico numĂ©rico.Numerical forecasting in Argentina has to deal with the problem of availability of observational data for the analysis. In this paper we describe a test based on the analysis of the conventional data as well as on the cloud patterns received by the APT â Station of Ezeiza. For this purpose we applied a two layer baroclinic model and extended the forecast for a period of 24 hours. The result indicates that with the data currently available it is possible to employ numerical methods for routine forecasting.AsociaciĂłn Argentina de GeofĂsicos y Geodesta
SK channels contribution to ventricular electrophysiology in heart failure patients
Heart failure (HF) is characterized by deterioration of the electrical and contractile function of the heart due to structural and functional remodelling, leading to development of arrhythmias and increased sudden cardiac death risk. SK channels are a type of calcium-activated potassium channels that do not play a relevant role in normal ventricular electrophysiology. However, it has been hypothesized that these channels become more relevant in pathologies such as HF. Nontheless, their role in human ventricular electrophysiology is not fully characterized
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