RESUMO

Introducción: La procrastinación académica es la conducta negativa de postergar sin razón diversas tareas. Se ha relacionado con diferentes variables, sin embargo, se desconoce si los hábitos de lectura influyen en su reducción. Objetivo: Determinar la influencia de los hábitos de lectura en la procrastinación académica en estudiantes de enfermería. Métodos: Estudio descriptivo, correlacional causal, con una muestra de 271 estudiantes de enfermería de primero a quinto año de formación en la Universidad Nacional de San Agustín de Arequipa, Perú. Se usaron dos instrumentos: el Inventario de hábitos de lectura de Muñoz y la escala de procrastinación de Busko. Se aplicó la prueba r de Pearson y el análisis de regresión lineal. Resultados: Las estudiantes de enfermería tuvieron edades que fluctúan entre los 16 y 25 años, con predominio del sexo femenino. Los hábitos de lectura fueron de nivel medio en el 66,79 por ciento y alto en el 30,99 por ciento de los casos. El 97,05 por ciento de estudiantes tuvo algún nivel de procrastinación, de los cuales 2,58 por ciento registró un nivel alto. Existe asociación significativa tanto entre hábitos de lectura y edad, como entre procrastinación y año de estudios. Conclusión: Los hábitos de lectura se relacionan de forma inversa con la procrastinación académica y predicen su disminución(AU)

Introduction: Academic procrastination is the negative behavior of putting off various tasks without reason. It has been related to different variables; however, it is unknown whether reading habits influence its reduction. Objective: To determine the influence of reading habits on academic procrastination in nursing students. Methods: Descriptive study, causal correlation, with a sample of 271 nursing students from first to fifth year of training at the National University of San Agustín de Arequipa, Peru. Two instruments were used: Muñoz Reading Habits Inventory and Busko Procrastination Scale. Pearson's r test and linear regression analysis were applied. Results: The nursing students had ages that fluctuate between 16 and 25 years, with a predominance of females. Reading habits were medium level in 66.79 percent and high in 30.99 percent of the cases. Certain level of procrastination was identified in 97.05 percent of students, 2.58 percent of them registered a high level. There is significant association between reading habits and age, as well as between procrastination and year of studies. Conclusion: Reading habits are inversely related to academic procrastination and predict its decline(AU)

Assuntos

RESUMO

Salar de Uyuni (SdU), with a geological history that reflects 50 000 years of climate change, is the largest hypersaline salt flat on Earth and is estimated to be the biggest lithium reservoir in the world. Its salinity reaches saturation levels for NaCl, a kosmotropic salt, and high concentrations of MgCL2 and LiCl, both salts considered important chaotrophic stressors. In addition, extreme temperatures, anoxic conditions, high UV irradiance, high albedo and extremely low concentrations of phosphorous, make SdU a unique natural extreme environment in which to contrast hypotheses about limiting factors of life diversification. Geophysical studies of brines from different sampling stations show that water activity is rather constant along SdU. Geochemical measurements show significant differences in magnesium concentration, ranging from 0.2 to 2M. This work analyses the prokaryotic diversity and community structure at four SdU sampling stations, selected according to their location and ionic composition. Prokaryotic communities were composed of both Archaea (with members of the classes Halobacteria, Thermoplasmata and Nanohaloarchaea, from the Euryarchaeota and Nanohaloarcheota phyla respectively) and Bacteria (mainly belonging to Bacteroidetes and Proteobacteria phyla). The important differences in composition of microbial communities inversely correlate with Mg2+ concentration, suggesting that prokaryotic diversity at SdU is chaotropic dependent.

Assuntos

RESUMO

Our goal was to examine the composition of methanogenic archaea (MA) and sulfate-reducing (SRP) and sulfur-oxidizing (SOP) prokaryotes in the extreme athalassohaline and particularly sulfate-rich sediment of Tirez Lagoon (Spain). Thus, adenosine-5'-phosphosulfate (APS) reductase α (aprA) and methyl coenzyme M reductase α (mcrA) gene markers were amplified given that both enzymes are specific for SRP, SOP, and MA, respectively. Anaerobic populations sampled at different depths in flooded and dry seasons from the anoxic sediment were compared qualitatively via denaturing gradient gel electrophoresis (DGGE) fingerprint analysis. Phylogenetic analyses allowed the detection of SRP belonging to Desulfobacteraceae, Desulfohalobiaceae, and Peptococcaceae in ∂-proteobacteria and Firmicutes and SOP belonging to Chromatiales/Thiotrichales clade and Ectothiorhodospiraceae in γ-proteobacteria as well as MA belonging to methylotrophic species in Methanosarcinaceae and one hydrogenotrophic species in Methanomicrobiaceae. We also estimated amino acid composition, GC content, and preferential codon usage for the AprA and McrA sequences from halophiles, nonhalophiles, and Tirez phylotypes. Even though our results cannot be currently conclusive regarding the halotolerant strategies carried out by Tirez phylotypes, we discuss the possibility of a plausible "salt-in" signal in SRP and SOP as well as of a speculative complementary haloadaptation between salt-in and salt-out strategies in MA.

RESUMO

In a previous article [Oggerin M., Arahal, D. R., Rubio, V. & Marin, I. (2009). Int J Syst Evol Microbiol 59, 2323-2328], it has been shown that strain Beijerinckia fluminensis UQM 1685(T) and its derived equivalent B. fluminensis CIP 106281(T) do not conform to the description of the type strain of Beijerinckia fluminensis Döbereiner and Ruschel 1958. Indeed, both strains were identified as members of the species Rhizobium radiobacter and exhibited marked phenotypic and genotypic differences with members of the genus Beijerinckia. It was concluded that both strains, and any other equivalents derived from them, do not descend from the nomenclatural type. Since then, our attempts to find older deposits of the type strain, hopefully derived from the original isolate, or other existing strains of Beijerinckia fluminensis that could be proposed as a neotype strain, have been in vain. It is therefore proposed that the Judicial Commission should place the name Beijerinckia fluminensis Döbereiner and Ruschel 1958 on the list of rejected names if a suitable replacement type strain or a neotype cannot be found within two years following the publication of this Request (Rule 18c).

Assuntos