Hongos formadores de micorrizas arbusculares: una alternativa biologica para la sostenibilidad de los agroecosistemas de praderas en el caribe colombiano

In recent years interest has sparked the interactions between plants and fungi, especially arbuscular mycorrhizae. Mycorrhizae represent symbiotic associations between plants and fungi based on the exchange of metabolites and nutrients. Over 95% of embriofitas plants are capable of forming with mycorrhizal symbiosis. Both plants and fungi occur worldwide, thus presenting ecotypes adapted to different conditions and extreme. It is noteworthy that the mycorrhizal and plants have a common origin. Arbuscular mycorrhizas are widespread in natural conditions, are found in every continent except Antarctica, occur in all soils, including abandoned mines, agricultural soils, wetland soils and aquatic habitats. Soils naturally possess a diversity of mycorrhizal species that can colonize the roots of most crop plants, regardless of environmental conditions, thereby improving nutrient supply, growth and production of host plants especially in poor nutrient conditions.En los últimos años ha despertado interés las interacciones entre plantas y hongos, especialmente con micorrizas arbusculares. Las micorrizas representan las asociaciones simbióticas entre las plantas y hongos basada sobre el intercambio de metabolitos y nutrientes. Más del 95 % de las plantas embriofitas son capaces de formas simbiosis con micorrizas. Tanto los hongos como las plantas tienen distribución universal, presentándose de esta manera ecotipos adaptados a condiciones diversas y extremas. Es de señalar que las plantas y las micorrizas tienen un origen común. Las micorrizas arbusculares están ampliamente distribuidas en condiciones naturales, se encuentran en todos los continentes, excepto en la Antártida; se dan en todos los suelos, incluyendo los de minas abandonadas, suelos agrícolas, suelos de pantanos y en hábitat acuáticos. Los suelos poseen naturalmente una diversidad de especies de micorrizas, que pueden colonizar las raíces de la mayoría de las plantas cultivadas, independientemente de las condiciones ambientales, mejorando así el suministro de nutrientes, crecimiento y producción de las plantas hospederas especialmente en condiciones de nutrientes deficientes

Diversidad de bacterias totales y endófitas asociadas a raíces del pasto bothriochloa pertusa (l) a. Camus

The objective of this study was to determine the diversity of total bacterial communities and cultivable endophytes associated with grass roots colosuana in the department of Sucre. The diversity of total bacterial communities and endophytes was made by isolation of colonies in culture media (SAKIYAMA et al., 2001). The population density was estimated by direct counting of colonies on plate and cultural characteristics of each morphotype were obtained by observation of each colony made. Once quantified total bacterial communities and endophytes, we determined the species richness (R), the diversity index of Shannon-Weaver (H) and equitability of morphotypes with mathematical models suggested for each purpose. To establish statistical differences between total bacterial communities and endophytes were conducted ANOVAs, parametric and nonparametric test using the program R. 14 farms Livestock were sampled, located in the physiographic region of Sabana de Sucre, where he was reported for the first time the presence of bacteria associated with endophytes colosuana roots. Significant differences were detected between species richness and evenness of total bacteria and endophytes in grass roots. This is the first report that we have about the presence of bacteria endophytes in grass roots of this worldwide.El objetivo del presente trabajo fue determinar la diversidad de comunidades cultivables de bacterias totales y endófitas asociadas a raíces del pasto colosuana en el departamento de Sucre. La diversidad de comunidades de bacterias totales y endófitas fue realizada mediante aislamiento de colonias en medios de cultivos (SAKIYAMA et al., 2001). La densidad poblacional fue estimada por conteo directo de colonias en placa y las características culturales de cada morfotipo fueron obtenidas mediante observación de cada colonia formada. Una vez cuantificadas las comunidades de bacterias totales y endófitas, se determinó la riqueza de especie (R), el índice de diversidad de ShannonWeaver (H) y la equitabilidad de morfotipos mediante modelos matemáticos propuestos para cada fin. Para establecer diferencias estadísticas entre comunidades de bacterias totales y endófitas se realizaron ANOVAS, test paramétricos y no paramétricos utilizando el programa R. Fueron muestreadas 14 fincas ganaderas, localizadas en la región fisiográfica de Sabanas de Sucre, donde fue reportada la presencia por primera vez de bacterias endófitas asociadas a las raíces de colosuana. Fueron encontradas diferencias significativas entre la riqueza de especies y la equitabilidad de bacterias totales y endófitas en raíces del pasto. Este es el primer reporte que se tiene sobre la presencia de bacterias endófitas en la raíces de este pasto a nivel mundial

Evaluación de la actividad antifúngica de melia azederach sobre aislados de colletotrichum spp

The study was to evaluate in vitro antifungal activity of leaf extract of Melia azedarach L on fungi isolated from Colletotrichum sp, which causes anthracnose disease of yam cultivation in the department of Sucre, Colombia. Total extracts were obtained in ethanol from the dried leaves of M. azederach by Soxhlet extraction method and from the extracts, were prepared with liquid-liquid splits light petroleum (E. petrol) and ethyl acetate (AcOEt). Total ethanolic extract and two fractions were prepared different concentrations (ppm) and its activity was evaluated in vitro in 4 isolates of Colletotrichum sp. Isolates that showed increased susceptibility to the extracts were C040 and C853 compared to C279 and C507 who were resistant to the activity of the extract. Greater antifungal activity was observed in total ethanol extract and ethyl acetate fraction from 50 ppm. The phytochemical screening performed in M, azederach, indicated the presence of secondary metabolites such terpenes/sterols, alkaloids, saponins, tannins and anthocyanins. This is the first draft you have in Colombia on the in vitro effect of plant extract of this plant species on the growth of fungi isolated from the genus Colletotrichum sp causing anthracnose disease of yam cultivation in the Colombian Caribbean región.El estudio consistió en evaluar in vitro la actividad antifúngica del extracto de hoja de Melia azederach L sobre aislados de hongos del género Colletotrichum sp, causante de la enfermedad de la antracnosis en el cultivo del ñame en el departamento de Sucre, Colombia. Fueron obtenidos extractos totales en etanol a partir de hojas secas de M. azederach mediante el método de extracción por Soxhlet y a partir del extracto total, se prepararon fraccionamientos líquido-líquido con éter de petróleo (E. petrol) y acetato de etilo (AcOEt). Del extracto total etanólico y las dos fracciones se prepararon diferentes concentraciones (ppm) y su actividad fue evaluada in vitro sobre 4 aislados de Colletotrichum sp. Los aislados que mostraron mayor susceptibilidad a los extractos fueron C040 y C853 con respecto a C279 y C507 quienes presentaron resistencia a la actividad del extracto. Se observó mayor actividad antifúngica con el extracto total etanólico, y la fracción acetato de etilo a partir de 50 ppm. El screening fitoquímico realizado en M. azederach, indicó presencia de metabolitos secundarios tipo terpenos/ esteroles, alcaloides, saponinas, taninos y antocianinas. Este es el primer preliminar que se tiene en Colombia sobre el efecto in vitro del extracto vegetal de esta especie de planta sobre el crecimientos de aislados de hongos del genero Colletotrichum sp causante de la enfermedad de antracnosis en el cultivo de ñame en regiones Caribeñas de Colombia

Evaluación de métodos para medir la actividad inhibitoria de extractos vegetales nativos del departamento de sucre sobre bacterias y levadura patógenas

The objective of this study was to evaluate the efficiency of two methods for measuring inhibitory activity of native ethanolic extracts plant of the Department of Sucre on bacteria and yeast human pathogenic. Sampling was conducted in the municipalities of Morroa and Sincelejo. The leaves of the plants Melia azederach, Sapium sp, Jatropha gossypilia, Psidium guajava, Origanum vulgare, Melissa officinalis, Eucalyptus sp and Cymbopogon citratus were processed using the methods of percolation and Soxhlet for the extraction of the extract. Methods were tested on agar hole method (Method 1) and the sensitive disk method (method 2) to measure the inhibitory effect on Pseudomonas aeruginosa, Klebsiella oxytoca, Enterococcus faecalis, Escherichia coli, and Bulkolderia glumaea Zygosaccharomyces microellipsoides. The results demonstrate that the method 2 allows greater efficiency and interpretation of results with regard to method 1 where there was diffusion of the extracts in the hole, which creates interference in the measurement. This is the first work in the department of Sucre where two methods are evaluated to determine inhibitory activity of a large group of native plants on pathogenic bacteria and yeast.El objetivo del presente trabajo fue evaluar la eficiencia de dos métodos para medir actividad inhibitoria de extractos vegetales etanólicos nativos del Departamento de Sucre sobre bacterias y levadura patógenas de humanos y plantas. Los muestreos se realizaron en los municipios de Morroa y Sincelejo. Las hojas de las plantas Melia Azederach, Sapium sp, Jatropha gossypilia, Psidium guajava, Origanum vulgare Melissa officinalis, Eucalyptus sp y Cymbopogon citratus fueron procesadas utilizando los métodos de percolación y de soxhlet para la extracción de los extractos. Se evaluaron los métodos de orificio sobre agar (método 1) y el método de disco sensitivos (método 2) para medir el efecto inhibitorio sobre Pseudomonas aeruginosa, Klebsiella oxytoca, Enterococcus faecalis, Escherichia coli, Bulkolderia glumaea y Zygosaccharomyces microellipsoides. Los resultados obtenidos demuestran que el método 2 permite una mayor eficacia e interpretación de los resultados con relación al método 1 donde se observó difusión de los extractos en el orificio, lo cual crea interferencia en la medición. Este es el primer trabajo en el departamento de Sucre donde se evalúan dos métodos para determinar actividad inhibitoria de un grupo amplio de plantas nativas sobre bacterias y levadura patógenas

Meta-analysis Reveals Genome-Wide Significance at 15q13 for Nonsyndromic Clefting of Both the Lip and the Palate, and Functional Analyses Implicate GREM1 As a Plausible Causative Gene

Nonsyndromic orofacial clefts are common birth defects with multifactorial etiology. The most common type is cleft lip, which occurs with or without cleft palate (nsCLP and nsCLO, respectively). Although genetic components play an important role in nsCLP, the genetic factors that predispose to palate involvement are largely unknown. In this study, we carried out a meta-analysis on genetic and clinical data from three large cohorts and identified strong association between a region on chromosome 15q13 and nsCLP (P = 8.13×10−14 for rs1258763; relative risk (RR): 1.46, 95% confidence interval (CI): 1.32–1.61)) but not nsCLO (P = 0.27; RR: 1.09 (0.94–1.27)). The 5 kb region of strongest association maps downstream of Gremlin-1 (GREM1), which encodes a secreted antagonist of the BMP4 pathway. We show during mouse embryogenesis, Grem1 is expressed in the developing lip and soft palate but not in the hard palate. This is consistent with genotype-phenotype correlations between rs1258763 and a specific nsCLP subphenotype, since a more than two-fold increase in risk was observed in patients displaying clefts of both the lip and soft palate but who had an intact hard palate (RR: 3.76, CI: 1.47–9.61, Pdiff<0.05). While we did not find lip or palate defects in Grem1-deficient mice, wild type embryonic palatal shelves developed divergent shapes when cultured in the presence of ectopic Grem1 protein (P = 0.0014). The present study identified a non-coding region at 15q13 as the second, genome-wide significant locus specific for nsCLP, after 13q31. Moreover, our data suggest that the closely located GREM1 gene contributes to a rare clinical nsCLP entity. This entity specifically involves abnormalities of the lip and soft palate, which develop at different time-points and in separate anatomical regions.Clefts of the lip and palate are common birth defects, and require long-term multidisciplinary management. Their etiology involves genetic factors and environmental influences and/or a combination of both, however, these interactions are poorly defined. Moreover, although clefts of the lip may or may not involve the palate, the determinants predisposing to specific subphenotypes are largely unknown. Here we demonstrate that variations in the non-coding region near the GREM1 gene show a highly significant association with a particular phenotype in which cleft lip and cleft palate co-occ

The Fourteenth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the extended Baryon Oscillation Spectroscopic Survey and from the second phase of the Apache Point Observatory Galactic Evolution Experiment

The fourth generation of the Sloan Digital Sky Survey (SDSS-IV) has been in operation since July 2014. This paper describes the second data release from this phase, and the fourteenth from SDSS overall (making this, Data Release Fourteen or DR14). This release makes public data taken by SDSS-IV in its first two years of operation (July 2014-2016). Like all previous SDSS releases, DR14 is cumulative, including the most recent reductions and calibrations of all data taken by SDSS since the first phase began operations in 2000. New in DR14 is the first public release of data from the extended Baryon Oscillation Spectroscopic Survey (eBOSS); the first data from the second phase of the Apache Point Observatory (APO) Galactic Evolution Experiment (APOGEE-2), including stellar parameter estimates from an innovative data driven machine learning algorithm known as "The Cannon"; and almost twice as many data cubes from the Mapping Nearby Galaxies at APO (MaNGA) survey as were in the previous release (N = 2812 in total). This paper describes the location and format of the publicly available data from SDSS-IV surveys. We provide references to the important technical papers describing how these data have been taken (both targeting and observation details) and processed for scientific use. The SDSS website (www.sdss.org) has been updated for this release, and provides links to data downloads, as well as tutorials and examples of data use. SDSS-IV is planning to continue to collect astronomical data until 2020, and will be followed by SDSS-V.Comment: SDSS-IV collaboration alphabetical author data release paper. DR14 happened on 31st July 2017. 19 pages, 5 figures. Accepted by ApJS on 28th Nov 2017 (this is the "post-print" and "post-proofs" version; minor corrections only from v1, and most of errors found in proofs corrected

Antimicrobial resistance among migrants in Europe: a systematic review and meta-analysis

BACKGROUND: Rates of antimicrobial resistance (AMR) are rising globally and there is concern that increased migration is contributing to the burden of antibiotic resistance in Europe. However, the effect of migration on the burden of AMR in Europe has not yet been comprehensively examined. Therefore, we did a systematic review and meta-analysis to identify and synthesise data for AMR carriage or infection in migrants to Europe to examine differences in patterns of AMR across migrant groups and in different settings. METHODS: For this systematic review and meta-analysis, we searched MEDLINE, Embase, PubMed, and Scopus with no language restrictions from Jan 1, 2000, to Jan 18, 2017, for primary data from observational studies reporting antibacterial resistance in common bacterial pathogens among migrants to 21 European Union-15 and European Economic Area countries. To be eligible for inclusion, studies had to report data on carriage or infection with laboratory-confirmed antibiotic-resistant organisms in migrant populations. We extracted data from eligible studies and assessed quality using piloted, standardised forms. We did not examine drug resistance in tuberculosis and excluded articles solely reporting on this parameter. We also excluded articles in which migrant status was determined by ethnicity, country of birth of participants' parents, or was not defined, and articles in which data were not disaggregated by migrant status. Outcomes were carriage of or infection with antibiotic-resistant organisms. We used random-effects models to calculate the pooled prevalence of each outcome. The study protocol is registered with PROSPERO, number CRD42016043681. FINDINGS: We identified 2274 articles, of which 23 observational studies reporting on antibiotic resistance in 2319 migrants were included. The pooled prevalence of any AMR carriage or AMR infection in migrants was 25·4% (95% CI 19·1-31·8; I2 =98%), including meticillin-resistant Staphylococcus aureus (7·8%, 4·8-10·7; I2 =92%) and antibiotic-resistant Gram-negative bacteria (27·2%, 17·6-36·8; I2 =94%). The pooled prevalence of any AMR carriage or infection was higher in refugees and asylum seekers (33·0%, 18·3-47·6; I2 =98%) than in other migrant groups (6·6%, 1·8-11·3; I2 =92%). The pooled prevalence of antibiotic-resistant organisms was slightly higher in high-migrant community settings (33·1%, 11·1-55·1; I2 =96%) than in migrants in hospitals (24·3%, 16·1-32·6; I2 =98%). We did not find evidence of high rates of transmission of AMR from migrant to host populations. INTERPRETATION: Migrants are exposed to conditions favouring the emergence of drug resistance during transit and in host countries in Europe. Increased antibiotic resistance among refugees and asylum seekers and in high-migrant community settings (such as refugee camps and detention facilities) highlights the need for improved living conditions, access to health care, and initiatives to facilitate detection of and appropriate high-quality treatment for antibiotic-resistant infections during transit and in host countries. Protocols for the prevention and control of infection and for antibiotic surveillance need to be integrated in all aspects of health care, which should be accessible for all migrant groups, and should target determinants of AMR before, during, and after migration. FUNDING: UK National Institute for Health Research Imperial Biomedical Research Centre, Imperial College Healthcare Charity, the Wellcome Trust, and UK National Institute for Health Research Health Protection Research Unit in Healthcare-associated Infections and Antimictobial Resistance at Imperial College London

Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases: subgroup analyses of the RESTART randomised, open-label trial

Background Findings from the RESTART trial suggest that starting antiplatelet therapy might reduce the risk of recurrent symptomatic intracerebral haemorrhage compared with avoiding antiplatelet therapy. Brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases (such as cerebral microbleeds) are associated with greater risks of recurrent intracerebral haemorrhage. We did subgroup analyses of the RESTART trial to explore whether these brain imaging features modify the effects of antiplatelet therapy

Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey

APOGEE-2 is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemo-dynamical mapping of the Milky Way Galaxy. The targeting for APOGEE-2 is complex and has evolved with time. In this paper, we present the updates and additions to the initial targeting strategy for APOGEE-2N presented in Zasowski et al. (2017). These modifications come in two implementation modes: (i) "Ancillary Science Programs" competitively awarded to SDSS-IV PIs through proposal calls in 2015 and 2017 for the pursuit of new scientific avenues outside the main survey, and (ii) an effective 1.5-year expansion of the survey, known as the Bright Time Extension, made possible through accrued efficiency gains over the first years of the APOGEE-2N project. For the 23 distinct ancillary programs, we provide descriptions of the scientific aims, target selection, and how to identify these targets within the APOGEE-2 sample. The Bright Time Extension permitted changes to the main survey strategy, the inclusion of new programs in response to scientific discoveries or to exploit major new datasets not available at the outset of the survey design, and expansions of existing programs to enhance their scientific success and reach. After describing the motivations, implementation, and assessment of these programs, we also leave a summary of lessons learned from nearly a decade of APOGEE-1 and APOGEE-2 survey operations. A companion paper, Santana et al. (submitted), provides a complementary presentation of targeting modifications relevant to APOGEE-2 operations in the Southern Hemisphere.Comment: 59 pages; 11 Figures; 7 Tables; 2 Appendices; Submitted to Journal and Under Review; Posting to accompany papers using the SDSS-IV/APOGEE-2 Data Release 17 scheduled for December 202

Effect of Dietary Zinc Oxide on Morphological Characteristics, Mucin Composition and Gene Expression in the Colon of Weaned Piglets

The trace element zinc is often used in the diet of weaned piglets, as high doses have resulted in positive effects on intestinal health. However, the majority of previous studies evaluated zinc supplementations for a short period only and focused on the small intestine. The hypothesis of the present study was that low, medium and high levels of dietary zinc (57, 164 and 2,425 mg Zn/kg from zinc oxide) would affect colonic morphology and innate host defense mechanisms across 4 weeks post-weaning. Histological examinations were conducted regarding the colonic morphology and neutral, acidic, sialylated and sulphated mucins. The mRNA expression levels of mucin (MUC) 1, 2, 13, 20, toll-like receptor (TLR) 2, 4, interleukin (IL)-1β, 8, 10, interferon-γ (IFN-γ) and transforming growth factor-β (TGF-β) were also measured. The colonic crypt area increased in an age-depending manner, and the greatest area was found with medium concentration of dietary zinc. With the high concentration of dietary zinc, the number of goblet cells containing mixed neutral-acidic mucins and total mucins increased. Sialomucin containing goblet cells increased age-dependently. The expression of MUC2 increased with age and reached the highest level at 47 days of age. The expression levels of TLR2 and 4 decreased with age. The mRNA expression of TLR4 and the pro-inflammatory cytokine IL-8 were down-regulated with high dietary zinc treatment, while piglets fed with medium dietary zinc had the highest expression. It is concluded that dietary zinc level had a clear impact on colonic morphology, mucin profiles and immunological traits in piglets after weaning. Those changes might support local defense mechanisms and affect colonic physiology and contribute to the reported reduction of post-weaning diarrhea