Plant reproduction research in Latin America: Toward sustainable agriculture in a changing environment.

Food production and food security depend on the ability of crops to cope with anthropogenic climate change and successfully produce seed. To guarantee food production well into the future, contemporary plant scientists in Latin America must carry out research on how plants respond to environmental stressors such as temperature, drought, and salinity. This review shows the opportunities to apply these results locally and abroad and points to the gaps that still exist in terms of reproductive processes with the purpose to better link research with translational work in plant breeding and biotechnology. Suggestions are put forth to address these gaps creatively in the face of chronic low investment in science with a focus on applicability.

Evidence of scale-free clusters of vegetation in tropical rainforests.

Tropical rainforests exhibit a rich repertoire of spatial patterns emerging from the intricate relationship between the microscopic interaction between species. In particular, the distribution of vegetation clusters can shed much light on the underlying process that regulates the ecosystem. Analyzing the distribution of vegetation clusters at different resolution scales, we show the first robust evidence of scale-invariant clusters of vegetation, suggesting the coexistence of multiple intertwined scales in the collective dynamics of tropical rainforests. We use field data and computational simulations to confirm our hypothesis, proposing a predictor that could be particularly interesting to monitor the ecological resilience of the world's "green lungs."

Polineuropatía por amiloidosis por transtiretina de inicio tardío. Caso clínico / Late-onset hereditary transthyretin amyloidosis with polyneuropathy. Report of one case

Hereditary transthyretin amyloidosis is a multisystemic autosomal dominant genetic disorder characterized by progressive distal sensory-motor polyneuropathy or restrictive cardiomyopathy, secondary to amyloid deposits. Its pathogenesis lies in the TTR gene mutation, and the Val50Met mutation is the most frequent. Patients have significant differences in the onset and severity of clinical presentation according to their country of origin. The diagnosis of this pathology is complex, even more in countries where it is not considered endemic. However, early suspicion and management are essential to improve survival and avoid unnecessary diagnostic and therapeutic strategies. We report a 69-year-old woman who presented a sensory-motor polyneuropathy, predominantly sensory, associated with distal neuropathic pain and bilateral vitritis. The history of her Italian father with polyneuropathy of unspecified etiology stood out. A vitreous biopsy identified amyloid substance deposits (congo red positive). These were also confirmed on a superficial peroneal nerve biopsy. During the etiological study of her polyneuropathy, an increased Kappa/Lambda index of 2.55 mg/L stood out. Therefore, light chain amyloidosis was suspected, and chemotherapy treatment was indicated without favorable response. After 10 years of progressive neurological and ophthalmological involvement, a genetic study confirmed the first case of late-onset hereditary transthyretin amyloidosis Val50Met with polyneuropathy in Chile.

Effects of the economic recession on suicide mortality in Brazil: interrupted time series analysis / Efectos de la recesión económica en la mortalidad por suicidio en Brasil: análisis de series de tiempo interrumpido / Efeitos da recessão econômica na mortalidade por suicídio no Brasil: análise com séries temporais interrompidas

ABSTRACT Objectives: to analyze trends in suicide rates in Brazil in the period before and after the start of the economic recession. Methods: interrupted time series research using national suicide data recorded in the period between 2012 and 2017 with socioeconomic subgroups analyses. Quasi-Poisson regression model was employed to analyze trends in seasonally adjusted data. Results: there was an abrupt increase in the risk of suicide after economic recession in the population with less education (12.5%; RR = 1.125; 95%CI: 1.027; 1.232) and in the South Region (17.7%; 1.044; 1.328). After an abrupt reduction, there was a progressive increase in risk for the black and brown population and for those with higher education. In most other population strata, there was a progressive increase in the risk of suicide. Conclusions: the Brazilian economic recession caused different effects on suicide rates, considering social strata, which requires health strategies and policies that are sensitive to the most vulnerable populations.

RESUMEN Objetivos: analizar tendencias de tasas de suicidio en Brasil, antes y después del inicio de la recesión económica. Métodos: estudio de series de tiempo interrumpido utilizando datos nacionales de suicidio registrados entre 2012 y 2017 con análisis por subgrupos socioeconómicos. Modelo de regresión quasi-Poisson empleado para analizar tendencias de datos ajustados estacionalmente. Resultados: observado aumento abrupto en el riesgo de suicidio pos recesión económica en la población con menor escolaridad (12,5%; RR = 1,125; IC95%:1,027; 1,232) y en la Región Sur (17,7%; 1,044; 1,328). Pos reducción abrupta, ocurrió aumento progresivo en el riesgo para la población de negros y pardos y de mayor escolaridad. En la mayoría de los demás estratos poblacionales, verificado aumento progresivo en el riesgo de suicidio. Conclusiones: la recesión económica brasileña produzco efectos diferentes en las tasas de suicidio, considerando los estratos sociales, lo que demanda estrategias de salud y políticas sensibles a poblaciones más vulnerables.

RESUMO Objetivos: analisar as tendências nas taxas de suicídio no Brasil, no período antes e depois do início da recessão econômica. Métodos: estudo de séries temporais interrompidas utilizando dados nacionais de suicídio registrados no período entre 2012 e 2017 com análises por subgrupos socioeconômicos. Modelo de regressão quasi-Poisson foi empregado para analisar as tendências dos dados ajustados sazonalmente. Resultados: observou-se aumento abrupto no risco de suicídio após recessão econômica na população com menor escolaridade (12,5%; RR = 1,125; IC95%:1,027; 1,232) e na Região Sul (17,7%; 1,044; 1,328). Após redução abrupta, ocorreu aumento progressivo no risco para a população de pretos e pardos e na de maior escolaridade. Na maioria dos demais estratos populacionais, verificou-se aumento progressivo no risco de suicídio. Conclusões: a recessão econômica brasileira produziu efeitos diferentes nas taxas de suicídio, considerando os estratos sociais, o que demanda estratégias de saúde e políticas sensíveis às populações mais vulneráveis.

Asociación entre la caminabilidad del barrio de residencia y la mortalidad por distintas causas en Andalucía / Association between neighborhood walkability and mortality due to different causes in Andalusia (Spain)

Objetivo: Describir la asociación entre la caminabilidad del barrio de residencia y la mortalidad. Método: Estudio ecológico de áreas pequeñas. Se calcularon las razones de mortalidad estandarizadas (RME) y el Walk Score© en cada sección censal. Los valores se compararon con pruebas paramétricas y no paramétricas. Resultados: En los hombres, las RME medias para enfermedades isquémicas en las categorías de más y de menos caminabilidad fueron 1,03 y 0,85 (p <0,01), y para la enfermedad pulmonar obstructiva crónica (EPOC) fueron de 1,009 y 1,20 (p <0,01). En las mujeres, las medias de las RME para la diabetes fueron de 0,97 y 1,2 (p <0,01), para las enfermedades isquémicas fueron 1,01 y 1,12 (p <0,01), para las enfermedades cerebrovasculares fueron 1,007 y 1,18 (p <0,01), para la EPOC fueron 1,01 y 1,49 (p <0,01), y para todas las causas fueron 1,006 y 1,08 (p <0,01). Conclusiones: El comportamiento para caminar dentro de las actividades de la vida diaria es distinto entre sexos. Vivir en barrios caminables es un factor protector para las mujeres. (AU)

Objective: To describe the association between the Neighborhood Walkability and mortality. Method: Ecological study of small areas. The standardized mortality ratios (SMR) and the Walk Score© were calculated in each census tract. These values were compared with parametric and nonparametric tests. Results: For men, in the case of ischemic diseases, the means of the SMR for the categories with the highest walkability and the least were 1.03 and 0.85 (p <0.01), and in chronic obstructive pulmonary disease (COPD) were 1,009 and 1.20 (p <0.01). In women, the means of the SMR for diabetes were 0.97 and 1.2 (p <0.01), for ischemic diseases were 1.01 and 1.12 (p <0.01), for cerebrovascular diseases were 1.007 and 1.18 (p <0.01), for COPD were 1.01 and 1.49 (p <0.01) and for all causes were 1.006 and 1.08 (p <0.01) Conclusions: Behavior about walking in the activities of daily life is different between sexes. Living in walkable neighborhoods is a protective factor for women. (AU)

Modelos predictivos de la epidemia de COVID-19 en España con curvas de Gompertz / Predictive models of the COVID-19 epidemic in Spain with Gompertz curves

Durante la crisis de salud internacional provocada por la pandemia de COVID-19, además de conocer los datos sobre contagios, muertes y ocupación de camas hospitalarias también es necesario hacer predicciones que ayuden a la gestión de la crisis por parte de las autoridades sanitarias. El presente trabajo tiene como objetivo describir la metodología utilizada para la elaboración de modelos predictivos de contagios y defunciones para la epidemia de COVID-19 en España basados en curvas de Gompertz. La metodología se aplica al total del país y a cada una de sus comunidades autónomas. De acuerdo con los datos oficiales publicados a la fecha de realización de este trabajo, y a través de los modelos descritos, estimamos un total de alrededor de 240.000 contagiados y 25.000 fallecidos al final de la epidemia. Pronosticamos el final de la epidemia entre los meses de junio y julio de 2020

During the international health crisis caused by the COVID-19 pandemic, it is necessary not only to know the data on infections, deaths and the occupation of hospital beds, but also to make predictions that help health authorities in the management of the crisis. The present work aims to describe the methodology used to develop predictive models of infections and deaths for the COVID-19 epidemic in Spain, based on Gompertz curves. The methodology is applied to the country as a whole and to each of its Autonomous Communities. Based on the official data available on the date of this work, and through the models described, we estimate a total of around 240.000 infected and 25.000 deaths at the end of the epidemic. At a national level, we forecast the end of the epidemic between June and July 2020

Necrolisis epidérmica tóxica en el curso de un síndrome hemofagocítico secundario a linfoma de Hodgkin: caso clínico / Toxic epidermal necrolysis during a hemophagocytic syndrome secondary to Hodgkin lymphoma: report of one case

Toxic epidermal necrolysis (TEN) is a lethal entity, characterized by extensive epidermal necrosis and multiorgan failure. Hemophagocytic syndrome (HFS) is also a rare and lethal syndrome characterized by hyperinflammation that leads to the appearance of fever, pancytopenia, organomegaly and hemophagocytosis. The concomitance of these diseases is extremely uncommon. We report a 38 years old female, who during the course of a HFS secondary to Hodgkin Lymphoma (HL), presented a TEN secondary to antibiotics. She was admitted due to a consumptive syndrome, lymphadenopathy, visceromegaly and severe pancytopenia. Laboratory and bone marrow tests confirmed HFS. Due to constant fever, imipenem was indicated. On the third day she started with pain and skin rash. She evolved with positive Nikolsky sign. Cutaneous biopsy was concordant with extensive TEN, which was managed with intravenous immunoglobulin and dexamethasone. A complete response and normalization of the blood count were achieved. Finally, the lymph node biopsy showed HL of mixed cellularity type, which was managed with 8 cycles of ABVD chemotherapy, achieving complete remission.

Hipercalcemia, peak monoclonal y leucemización como presentación de un linfoma de células B de alto grado, con reordenamiento de MYC, BCL-2 y BCL-6 (Triple Hit). Caso clínico / Hypercalcemia, monoclonal peak and leukemic presentation of a High-grade B-cell lymphoma with MYC, BCL-2 and BCL-6 translocations (triple hit). Report of one case

High-grade B-cell lymphomas with rearrangement of MYC, BCL-2 and/or BCL-6 were introduced by the update of the WHO classification of lymphoid neoplasms. They usually present unique morphological and molecular characteristics, with an aggressive clinical outcome and worse prognosis. We report a 48 year-old female patient presenting with B symptoms and enlarged lymph nodes. Blood count showed pancytopenia and peripheral blood smears showed large lymphoid cells, some with nuclei and vacuoles. LDH was 3524 g/L and serum calcium was 11.5 mg/dL. Flow cytometry immunophenotyping showed pathological mature B lymphocytes. Protein electrophoresis showed a slight monoclonal peak. The biopsy disclosed a triple expressor diffuse large B-cell lymphoma, arising from germinal center. FISH was positive for MYC, BCL-2 and BCL-6 (triple hit) with a clonal evolution. Conventional cytogenetics showed a complex karyotype. Chemotherapy was started with R-CHOP (Rituximab/cyclophosphamide/doxorubicin/vincristine/prednisone). She developed impaired consciousness; the brain CT scan showed a large brain mass. The patient died within 3 weeks.

Granulomas pulmonares y en médula ósea: más allá de la tuberculosis. A propósito de un caso / Differential diagnosis of bone marrow and lung granulomas: Report of one case

The differential diagnosis of pulmonary tuberculosis and lymphoma with pulmonary infiltration is very difficult, given their similar clinical characteristics. We report a 59 year old female with weight loss, fever, dyspnea and cough of several months of duration. She had a cavitated mass in lung imaging. A positive conventional PCR lead to the diagnosis of tuberculosis, but she had negative smears and cultures for Mycobacterium tuberculosis. The patient did not respond to treatment and her clinical condition worsened. A peripheral lymph node biopsy confirmed the presence of a diffuse large B cell non-Hodgkin lymphoma. Bone marrow pathology showed non caseating granulomas, again with negative microbiological tests for M. tuberculosis. Findings in the bone marrow were interpreted as a secondary sarcoid reaction to cancer and PCR results as a false positive. The lymphoma was treated, achieving complete remission. This case highlights the importance of the differential diagnosis between these two entities.

Phenolic composition, antioxidant and anti-proliferative activities of edible and medicinal plants from the Peruvian Amazon

ABSTRACT Among 23 extracts of medicinal and edible plants tested, Mauritia flexuosa L.f., Arecaceae, showed significant antioxidant ability (DPPH and ORAC = 1062.9 and 645.9 ± 51.4 µg TE/mg extract, respectively), while Annona montana Macfad., Annonaceae, demonstrated the most promising anti-proliferative effect (IC50 for Hep-G2 and HT-29 = 2.7 and 9.0 µg/ml, respectively). However, combinatory antioxidant/anti-proliferative effect was only detected in Oenocarpus bataua Mart., Arecaceae (DPPH = 903.8 and ORAC = 1024 µg TE/mg extract; IC50 for Hep-G2 and HT-29 at 102.6 and 38.8 µg/ml, respectively) and Inga edulis Mart., Fabaceae (DPPH = 337.0 and ORAC = 795.7 µg TE/mg extract; IC50 for Hep-G2 and HT-29 at 36.3 and 57.9 µg/ml, respectively). Phenolic content was positively correlated with antioxidant potential, however not with anti-proliferative effect. None of these extracts possessed toxicity towards normal foetal lung cells, suggesting their possible use in development of novel plant-based agents with preventive and/or therapeutic action against oxidative stress-related diseases.

Análisis de la distribución geográfica de médicos especialistas en la República Argentina / Analysis of the geographical distribution of medical specialists in the Argentine Republic

A lo largo de las tres últimas décadas, muchos países de Latinoamérica y el Caribe (LAC) han reconocido la salud como un derecho humano y han actuado de acuerdo a ese reconocimiento. En consecuencia las exigencias a los sistemas de salud han aumentado de forma sostenida con el objetivo de responder mejor a la prestación de servicios. De ahí que se hayan promovido y puesto en marcha políticas y programas encaminados a lograr la cobertura universal de salud(1). En este contexto las políticas de Recursos Humanos han adquirido, si cabe, una mayor relevancia.

Enfermedad de Dieulafoy duodenal: a propósito de un caso / A case report of Dieulafoy's disease of the duodenum

La enfermedad de Dieulafoy es una causa infrecuente de hemorragia digestiva tanto alta como baja. La gran mayoría de estas lesiones están localizadas en el cuerpo y fondo gástrico. La localización duodenal ha sido comunicada de forma ocasional. El diagnóstico generalmente es endoscópico, lo que permite, además, realizar simultáneamente el tratamiento con inyectoterapia y esclerosis, por lo que la confirmación anatomopatológica es infrecuente. Presentamos el caso de un hombre de 68 años de edad con hemorragia digestiva alta severa debido a una lesión de Dieulafoy duodenal, con confirmación histológica(AU)

Dieulafoy’s disease is a rare cause of bleeding in either the upper or lower digestive tract. The majority of lesions are located in the body or fundus of the stomach, occurring only occasionally in the duodenum. It is generally diagnosed endoscopically and subsequently managed with endoscopic injection treatment, thus the histological confirmation of the diagnosis is in frequent. We report a case of Dieulafoy’s disease in the duodenum of a 68 year old man presenting with haemorrhage of the upper digestive tract, which was confirmed by histologically(AU)

Métodos para la suavización de indicadores de mortalidad: aplicación al análisis de desigualdades en mortalidad en ciudades del Estado español (Proyecto MEDEA) / Methods to smooth mortality indicators: application to analysis of inequalities in mortality in Spanish cities [the MEDEA Project]

Aunque la experiencia en el estudio de las desigualdadesen la mortalidad en las ciudades españolas es amplia, quedangrandes núcleos urbanos que no han sido investigadosutilizando la sección censal como unidad de análisis territorial.En este contexto se sitúa el proyecto coordinado ®Desigualdadessocioeconómicas y medioambientales en la mortalidaden ciudades de España. Proyecto MEDEA», en el cualparticipan 10 grupos de investigadores de Andalucía, Aragón,Cataluña, Galicia, Madrid, Comunitat Valenciana y PaísVasco. Cabe señalar cuatro particularidades: a) se utiliza comoárea geográfica básica la sección censal; b) se emplean métodosestadísticos que tienen en cuenta la estructura geográficade la región de estudio para la estimación de riesgos; c) seaprovechan las oportunidades que ofrecen 3 fuentes de datoscomplementarias (información sobre contaminación atmosférica,información sobre contaminación industrial y registrosde mortalidad), y d) se emprende un análisis coordinado degran alcance, favorecido por la implantación de la redes temáticasde investigación. El objetivo de este trabajo es explicarlos métodos para la suavización de indicadores de mortalidaden el proyecto MEDEA. El artículo se centra en lametodología y los resultados del modelo de mapa de enfermedadesde Besag, York y Mollié (BYM). Aunque en el proyectose han suavizado, mediante el modelo BYM, las razonesde mortalidad estandarizadas (RME) correspondientesa 17 grandes grupos de causas de defunción y 28 causasespecíficas, aquí se aplica esta metodología a la mortalidadpor cáncer de tráquea, de bronquios y de pulmón en ambossexos en la ciudad de Barcelona durante el período 1996-2003(AU)

Como resultado se aprecia un diferente patrón geográfico enlas RME suavizadas en ambos sexos. En los hombres se observanunas RME mayores que la unidad en los barrios conmayor privación socioeconómica. En las mujeres este patrónse observa en las zonas con un mayor nivel socioeconómico(AU)

Although there is some experience in the study of mortalityinequalities in Spanish cities, there are large urban centersthat have not yet been investigated using the census tract asthe unit of territorial analysis. The coordinated project ®Socioeconomicand environmental inequalities in mortality in Spanishcities. The MEDEA project» was designed to fill this gap,with the participation of 10 groups of researchers in Andalusia,Aragon, Catalonia, Galicia, Madrid, Valencia, and the BasqueCountry. The MEDEA project has four distinguishing features:a) the census tract is used as the basic geographicalarea; b) statistical methods that include the geographical structureof the region under study are employed for risk estimation;c) data are drawn from three complementary data sources(information on air pollution, information on industrialpollution, and the records of mortality registrars), and d) a coordinated,large-scale analysis, favored by the implantation ofcoordinated research networks, is carried out. The main objective of the present study was to explain the methods for smoothingmortality indicators in the context of the MEDEA project.This study focusses on the methodology and the resultsof the Besag, York and Mollié model (BYM) in disease mapping.In the MEDEA project, standardized mortality ratios(SMR), corresponding to 17 large groups of causes of deathand 28 specific causes, were smoothed by means of the BYMmodel; however, in the present study this methodology wasapplied to mortality due to cancer of the trachea, bronchi andlung in men and women in the city of Barcelona from 1996 to2003. As a result of smoothing, a different geographical patternfor SMR in both genders was observed. In men, a SMRhigher than unity was found in highly deprived areas. In contrast,in women, this pattern was observed in more affluentareas(AU)