Competencias digitales y habilidades investigativas en estudiantes de una universidad pública de Lima, 2022

La presente investigación titulada “Competencias digitales y habilidades investigativas en estudiantes de una universidad pública de Lima, 2022” tiene por objetivo determinar la relación de las competencias digitales y las habilidades investigativas en estudiante de una universidad pública. Para cumplir con ese propósito, esta investigación se ha desarrollado de acuerdo al enfoque cuantitativo, según los diseños no experimentales, transversales y de alcance correlacional con una muestra compuesta de 109 estudiantes. Entre los resultados más importantes de esta investigación, 51.4% de estudiantes presentaron un nivel alto en las competencias digitales respecto de un 67.9% de estudiantes que presentaron también un nivel alto de las habilidades investigativas. Por otra parte, de acuerdo con los hallazgos inferenciales, se obtuvo una significancia menor a 0.05 con lo que se ha determinado que existe relación entre las competencias digitales y las habilidades investigativas. Siendo Rho igual a 0.594 mediante el cual se concluye que existe correlación lineal positiva

Uso de colifagos somáticos como indicadores de contaminación fecal en playas de “la Costa Verde”, Lima–Perú

This study was undertaken in order to assess the use of somatic coliphages as faecal pollution indicators in recreational seawater. In 140 samples from 5 beaches at the “Costa Verde” circuit, Lima, somatic coliphages were enumerated and correlated with conventional faecal pollution indicators (Faecal coliforms, E. coli and enterococci). After sample treatment with the “Sample Filtration” modified technique, somatic coliphages were assayed by the “Single-Agar-Layer” method using the strain E. coli C ATCC 13706 as the bacterial host. Faecal coliforms (FC) E. coli (EC) and enterococci (EN) were enumerated by the Most Probable Number method. In the statistical analysis, we took into account faecal pollution levels based on arbitrary values such as <1000 CF/100 mL (“Low pollution”) and 1000 FC/100 mL (“High pollution”). The beaches surveyed showed faecal pollution levels from <3 to 2,4 x 105 to both FC and from EC, and <3 to 2,4 x 104 EN. In samples with “low pollution” the 32% of coliphage´s counts were greater than those of FC and EC, whereas on samples with “High pollution” no count was bigger than any of FC and EC. On the other hand, according with the principal component analysis, coliphages and enterococci were the best indicators of faecal pollution in the surveyed beaches. Furthermore, statistically significant correlations were determined between somatic coliphages with FC and EC; being greater on samples with “High pollution” (r = 0,89) than those in samples with “low pollution” (r = 0,43). From coliphages determination in the samples evaluated it was determined the value of 115 UFP/100 mL as a guideline for recreational seawater in the beaches under study. According with the results of this study, the somatic coliphages could be used as alternative faecal pollution indicators in recreational seawater.El presente estudio fue realizado con el objetivo de evaluar el uso de los colifagos somáticos como indicadores de contaminación fecal en aguas recreacionales marinas. Los colifagos somáticos fueron cuantificados en 140 muestras provenientes de 5 playas del circuito de la “Costa Verde”, Lima, y correlacionados con los indicadores de contaminación fecal convencionales (Coliformes fecales, E. coli y Enterococos). Los colifagos fueron determinados por el método de “capa simple” previa aplicación de la técnica modificada de “filtración de la muestra” y utilizando a E. coli ATCC 13706 como cepa hospedero. Los Coliformes fecales (CF), E. coli (EC) y Enterococos (EN) fueron cuantificados por el método del Número Más Probable (NMP). Para efectos de análisis estadístico se consideró niveles de contaminación fecal en función de valores arbitrarios de <1000 CF/100 mL (“baja contaminación”) y >1000 CF/100 mL (“alta contaminación”). Las playas evaluadas presentaron niveles de contaminación fecal de <3 a 2,4 x 105 CF y EC y <3 a 2,4 x 104 EN. En las muestras con “baja contaminación” fecal, el 32% de los recuentos de los colifagos fueron mayores que los de CF y EC; miemtras que en las muestras con “alta contaminación” ningún recuento de colifagos superó a los de CF o EC. Por otro lado, de acuerdo al análisis estadístico de componentes principales los colifagos y Enterococos fueron los mejores indicadores de contaminación fecal en las playas evaluadas. Asimismo, se determinó correlaciones estadísticamente significativas entre colifagos, CF y EC; siendo mayor en muestras con alta contaminación (r = 0,89) que en aquellas con baja contaminación (r = 0,43). Mediante la cuantificación de colifagos en las muestras evaluadas se determinó estadísticamente el valor de 115 UFP/100 mL como criterio calificativo de balneabilidad para las playas de la zona evaluada. De acuerdo a nuestros resultados los colifagos somáticos podrían emplearse como una alternativa de indicadores de contaminación fecal en aguas recreacionales marinas

Seasonal Changes in Methanogenesis and Methanogenic Community in Three Peatlands, New York State

Fluctuating environmental conditions can promote diversity and control dominance in community composition. In addition to seasonal temperature and moisture changes, seasonal supply of metabolic substrates selects populations temporally. Here we demonstrate cascading effects in the supply of metabolic substrates on methanogenesis and community composition of anaerobic methanogenic archaea in three contrasting peatlands in upstate New York. Fresh samples of peat soils, collected about every 3 months for 20 months and incubated at 22 ± 2°C regardless of the in situ temperature, exhibited potential rates of methane (CH4) production of 0.02–0.2 mmol L−1 day−1 [380–3800 nmol g−1 (dry) day−1). The addition of acetate stimulated rates of CH4 production in a fen peatland soil, whereas addition of hydrogen (H2), and simultaneous inhibition of H2-consuming acetogenic bacteria with rifampicin, stimulated CH4 production in two acidic bog soils, especially, in autumn and winter. The methanogenic community structure was characterized using T-RFLP analyses of SSU rRNA genes. The E2 group of methanogens (Methanoregulaceae) dominated in the two acidic bog peatlands with relatively greater abundance in winter. In the fen peatland, the E1 group (Methanoregulaceae) and members of the Methanosaetaceae were co-dominant, with E1 having a high relative abundance in spring. Change in relative abundance profiles among methanogenic groups in response to added metabolic substrates was as predicted. The acetate-amendment increased abundance of Methanosarcinaceae, and H2-amendment enhanced abundance of E2 group in all peat soils studied, respectively. Additionally, addition of acetate increased abundance of Methanosaetaceae only in the bog soils. Variation in the supply of metabolic substrates helps explain the moderate diversity of methanogens in peatlands

CRISPR Associated Diversity within a Population of Sulfolobus islandicus

Predator-prey models for virus-host interactions predict that viruses will cause oscillations of microbial host densities due to an arms race between resistance and virulence. A new form of microbial resistance, CRISPRs (clustered regularly interspaced short palindromic repeats) are a rapidly evolving, sequence-specific immunity mechanism in which a short piece of invading viral DNA is inserted into the host's chromosome, thereby rendering the host resistant to further infection. Few studies have linked this form of resistance to population dynamics in natural microbial populations.We examined sequence diversity in 39 strains of the archeaon Sulfolobus islandicus from a single, isolated hot spring from Kamchatka, Russia to determine the effects of CRISPR immunity on microbial population dynamics. First, multiple housekeeping genetic markers identify a large clonal group of identical genotypes coexisting with a diverse set of rare genotypes. Second, the sequence-specific CRISPR spacer arrays split the large group of isolates into two very different groups and reveal extensive diversity and no evidence for dominance of a single clone within the population.The evenness of resistance genotypes found within this population of S. islandicus is indicative of a lack of strain dominance, in contrast to the prediction for a resistant strain in a simple predator-prey interaction. Based on evidence for the independent acquisition of resistant sequences, we hypothesize that CRISPR mediated clonal interference between resistant strains promotes and maintains diversity in this natural population

Effectiveness in vitro and in vivo of a Camellia sinensis “green tea “ based gel against microorganisms of importance in periodontal processes

Las enfermedades periodontales después de la caries dental, son los problemas más prevalentes en lo que a salud bucal se refiere. La gingivits y la periodontitis son resultados de la presencia de las bacterias y sus productos capaces de alterar los tejidos así como de la respuesta del hospedero. Diversos estudios se han desarrollado utilizando productos naturales en el país, por ejemplo, la uña de gato, muña, propóleo, coca, el té verde comprobándose su acción antimicrobiana y en este ultimo caso también acción anticancerígena. El propósito del estudio fue determinar la efectividad in vivo de un gel elaborado con carboximetilceluloda y extracto alcohólico de té verde, é in vitro sobre microorganismos relacionados con la enfermedad periodontal como: Prevotella loeschi, Peptostreptococcus anaerobius y Capnocytophaga.Los resultados muestran la presencia de halos de inhibición del extracto de té verde a concentraciones de 100 %, 75 %, 50 % y 25 %; con el gel sólo se apreció acción en el sitio de contacto, sin halo. En lo referente a los resultados en pacientes se observó una mejoría del índice gingival (Loe y Silness) luego de la exposición al gel con extracto de té verde hasta por 2 semanas. Se concluye que el extracto de te verde tiene acción antibacteriana sobre las cepas ATCC de P. loechi, P. anaerobius a diversas concentraciones utilizadas, pero que el gel sólo manifiesta un efecto en el sitio de contacto. Hubo evidencia de mejoras en los índice gingivales en los pacientes tratados con el gel con extracto hasta las 2 semanas de evaluación.Periodontal diseases after dental caries are the most prevalent in the dental health is concerned. The gingivitis and periodontitis are the result of the presence of bacteria and their products capable of altering the tissue and the host response. Studies on action of Camellia sinensis (green tea) on microorganisms of periodontal disease, demonstrates the beneficial effects of this product and the application potential in different areas. Therefore the purpose of the study was to determine the in vivo effectiveness of a gel made from carboximetilcelulosa and alcoholic extract of green tea, and in vitro on microorganisms associated with periodontal disease: P. loeschi, P.anaerobius and Capnocytophaga. The results show the presence of halos of inhibition of green tea extract at concentrations of 100 %, 75 %, 50 % and 25 %, the gel was observed only action on the site of contact, no halo. Regarding the results in patients showed an improvement in gingival index (Loe and Silness) after exposure to gel with green tea extract for up to 2 weeks. We conclude that green tea extract has antibacterial action on ATCC strains of P. loechi, P.anaerobius various concentrations used, but the gel shows only an effect on the site of contact. There was evidence of improvements in the gingival index in patients treated with the gel extract up to 2 weeks of evaluation

Peatland core domain sets: building consensus on what should be measured in research and monitoring

It is often difficult to compile and synthesise evidence across multiple studies to inform policy and practice because different outcomes have been measured in different ways or datasets and models have not been fully or consistently reported. In the case of peatlands, a critical terrestrial carbon store, this lack of consistency hampers the evidence-based decisions in policy and practice that are needed to support effective restoration and conservation. This study adapted methods pioneered in the medical community to reach consensus over peatland outcomes that could be consistently measured and reported to improve the synthesis of data and reduce research waste. Here we report on a methodological framework for identifying, evaluating and prioritising the outcomes that should be measured. We discuss the subsequent steps to standardise methods for measuring and reporting outcomes in peatland research and monitoring. The framework was used to identify and prioritise sets of key variables (known as core domain sets) for UK blanket and raised bogs, and for tropical peat swamps. Peatland experts took part in a structured elicitation and prioritisation process, comprising two workshops and questionnaires, that focused on climate (32 and 18 unique outcomes for UK and tropical peats, respectively), hydrology (26 UK and 16 tropical outcomes), biodiversity (8 UK and 22 tropical outcomes) and fire-related outcomes (13, for tropical peatlands only). Future research is needed to tackle the challenges of standardising methods for data collection, management, analysis, reporting and re-use, and to extend the approach to other types of peatland. The process reported here is a first step towards creating datasets that can be synthesised to inform evidence-based policy and practice, and contribute towards the conservation, restoration and sustainable management of this globally significant carbon store. evidence-based policy and practice, evidence synthesis, outcomes, standardisationpublishedVersio

T-REX: software for the processing and analysis of T-RFLP data

Softwar

Biogeosciences perspectives on integrated, coordinated, open, networked (ICON) science

This article is composed of three independent commentaries about the state of ICON principles (Goldman et al. 2021) in the AGU Biogeosciences section and discussion on the opportunities and challenges of adopting them. Each commentary focuses on a different topic: Global collaboration, technology transfer and application (Section 2), Community engagement, citizen science, education, and stakeholder involvement (Section 3), and Field, experimental, remote sensing, and real-time data research and application (Section 4). We discuss needs and strategies for implementing ICON and outline short- and long-term goals. The inclusion of global data and international community engagement are key to tackle grand challenges in biogeosciences. Although recent technological advances and growing open-access information across the world have enabled global collaborations to some extent, several barriers ranging from technical to organizational to cultural have remained in advancing interoperability and tangible scientific progress in biogeosciences. Overcoming these hurdles is necessary to address pressing large-scale research questions and applications in the biogeosciences, where ICON principles are essential. Here, we list several opportunities for ICON, including coordinated experimentation and field observations across global sites, that are ripe for implementation in biogeosciences as a means to scientific advancements and social progress

Biogeosciences Perspectives on Integrated, Coordinated, Open, Networked (ICON) Science

This article is composed of three independent commentaries about the state of Integrated, Coordinated, Open, Networked (ICON) principles in the American Geophysical Union Biogeosciences section, and discussion on the opportunities and challenges of adopting them. Each commentary focuses on a different topic: (a) Global collaboration, technology transfer, and application (Section 2), (b) Community engagement, community science, education, and stakeholder involvement (Section 3), and (c) Field, experimental, remote sensing, and real-time data research and application (Section 4). We discuss needs and strategies for implementing ICON and outline short- and long-term goals. The inclusion of global data and international community engagement are key to tackling grand challenges in biogeosciences. Although recent technological advances and growing open-access information across the world have enabled global collaborations to some extent, several barriers, ranging from technical to organizational to cultural, have remained in advancing interoperability and tangible scientific progress in biogeosciences. Overcoming these hurdles is necessary to address pressing large-scale research questions and applications in the biogeosciences, where ICON principles are essential. Here, we list several opportunities for ICON, including coordinated experimentation and field observations across global sites, that are ripe for implementation in biogeosciences as a means to scientific advancements and social progress

Biogeosciences Perspectives on Integrated, Coordinated, Open, Networked (ICON) Science

This article is composed of three independent commentaries about the state of Integrated, Coordinated, Open, Networked (ICON) principles in the American Geophysical Union Biogeosciences section, and discussion on the opportunities and challenges of adopting them. Each commentary focuses on a different topic: (a) Global collaboration, technology transfer, and application (Section 2), (b) Community engagement, community science, education, and stakeholder involvement (Section 3), and (c) Field, experimental, remote sensing, and real-time data research and application (Section 4). We discuss needs and strategies for implementing ICON and outline short- and long-term goals. The inclusion of global data and international community engagement are key to tackling grand challenges in biogeosciences. Although recent technological advances and growing open-access information across the world have enabled global collaborations to some extent, several barriers, ranging from technical to organizational to cultural, have remained in advancing interoperability and tangible scientific progress in biogeosciences. Overcoming these hurdles is necessary to address pressing large-scale research questions and applications in the biogeosciences, where ICON principles are essential. Here, we list several opportunities for ICON, including coordinated experimentation and field observations across global sites, that are ripe for implementation in biogeosciences as a means to scientific advancements and social progress