ABSTRACT. Sea cucumbers (holothuroids) play a major role in coastal environments; their detritivore conduct favors oxygen penetration in the sediments and the disposal of pathogens on the sea floor. This study determined holothuroid diversity in the rocky intertidal zone of Matanchén Bay, Mexico. Sampling campaigns were carried out in January, March, May, and July 2018. Linear transects (10 m length and 1 m width) perpendicular to the coastline in rocky areas (0-3 m depth) were established, where the density (ind m-2) and proportion (%) of sea cucumbers were estimated. Organisms were photographed, examined live, and preserved in 70% alcohol for subsequent identification utilizing ossicle characterization. Our results show the presence of four sea cucumber species: Holothuria (Halodeima) inornataSemper, 1868, Holothuria (Selenkothuria) lubricaSelenka, 1867, Holothuria (Selenkothuria) portovallartensisCaso, 1954, and Holothuria (Mertensiothuria) viridiaurantiaBorrero-Pérez & Vanegas-González, 2019. The average density per species was 0.208, 0.108, 0.017, and 0.025 ind m-2, respectively; each species' proportion was 58.1, 30.2, 4.7, and 7.0%, respectively. Due to the above values, we found that the number and spatial distribution of sea cucumber species vary in Matanchén Bay.

Abstract Background: The Neotropical woody bamboos (NWB) comprise a clade native to the Western Hemisphere. Taxonomically the NWB are classified into three subtribes: Arthrostylidiinae, Chusqueinae, and Guaduinae. These woody bamboos are distributed from northern Mexico and the West Indies to south-central Chile and Argentina and from sea level to over 4,000 m in elevation. The most recent comprehensive treatment of the diversity and classification of NWB was published just over 20 years ago, and knowledge of the NWB has greatly increased in the interim. Questions and / or Hypotheses: How much has our knowledge of Neotropical woody bamboo diversity, distribution and classification changed in the last 20 years? Results: The present work reviews the current state of Neotropical woody bamboo taxonomy and provides 1) new morphological keys (in English and Spanish) to and synoptic descriptions of the NWB genera; 2) an updated comprehensive species list; and 3) a biodiversity analysis by country and habitat type. Neotropical woody bamboo diversity presently totals 446 species in 23 genera. In the 21st century, 103 new species and five genera of NWB have been described. Conclusions: The new species and genera described since 2000 have produced an increase in species richness of 29.5 % and a net increase in generic richness of 26.3 %. This new review will be useful for systematists, ecologists, conservation biologists and others working with woody bamboos in the Neotropics.

Resumen Antecedentes: Los bambúes leñosos neotropicales (NWB) pertenecen al clado nativo de América. Taxonómicamente los NWB se clasifican en tres subtribus: Arthrostylidiinae, Chusqueinae, y Guaduinae. Estos bambúes se distribuyen desde el norte de México y las Indias occidentales hasta el Sur - Centro de Chile y Argentina, y desde el nivel del mar hasta por encima de los 4,000 m. El tratamiento más completo de la diversidad y clasificación de los NWB fue publicado hace 20 años y el conocimiento de los NWB se ha incrementado desde entonces. Preguntas y/o Hipótesis: ¿Cuánto ha cambiado nuestro conocimiento de la diversidad, distribución y clasificación de los bambúes leñosos neotropicales en los últimos 20 años? Resultados: En en este estudio se realiza una revisión del estado actual de los bambúes leñosos neotropicales y se provee 1) nuevas claves morfológicas (inglés y español) y una descripción sinóptica a nivel de géneros; 2) una lista completa y actualizada de las especies; y 3) un análisis de la biodiversidad por país y tipo de hábitat. La diversidad total de los bambúes leñosos neotropicales actualmente es de 446 especies y 23 géneros. En este siglo 21, se han descrito 103 especies y 5 nuevos géneros. Conclusiones: Las especies y géneros nuevos descritos desde el 2000 han producido un incremento en la riqueza del 29.5 % y un incremento neto a nivel genérico del 26.3 %. Esta nueva revisión será útil para los taxónomos, ecólogos, biólogos de la conservación y otros que trabajen con bambúes leñosos en el Neotrópico.

This work deals on the preparation of silicon oxycarbide (SiOC) and silicon boron oxycarbide (SiBOC) ceramics from pyrolysis involving alkoxysilanes with different organic groups. Boron content, organic substituent and annealing time were evaluated on crystallization and composition of resulting ceramics. B-free precursors composed of methyltriethoxysilane (MTES), phenyltriethoxysilane (PTES) and vinyltrimethoxysilane (VTMS) were obtained by the sol-gel method, whilst B-containing precursors were prepared by adding to each alkoxysilane a proper amount of boric acid resulting in B/Si atomic ratios of 0.1 and 0.5. Precursors were pyrolyzed at 1500 ºC for 1 and 3 h to produce respective SiOC and SiBOC ceramics. X-ray diffraction (XRD) patterns revealed enhanced SiC phase crystallization for PTES-derived ceramics, followed by those containing vinyl and methyl groups, which was also confirmed by X-ray photoelectron spectroscopy (XPS) from percentages of SiºC and Si?O bonds. Csp2 and Csp3 amounts varied among ceramics, indicating direct influence of organic substituent on conductive carbon phase development. Boron addition induced the growth of SiC crystallites, having more evident effect in matrices with higher proportions of amorphous fraction and lower residual carbon amounts. Organic group nature, boron content and annealing time played an important role for production and evolution of SiC and C phases into ceramics.

ABSTRACT Recent studies suggested that cannabis use influences on the emergence of psychosis by disrupting neurodevelopmental processes that occur during adolescence and early adulthood and which are reflected on brain anatomical changes detectable with MRI. However, no MRI studies have investigated whether intrauterine neurodevelopmental abnormalities also interact with later cannabis use to influence on psychosis risk. We investigated differences between first-episode psychosis (FEP) patients with history of cannabis use (FEPC+, n=28), FEP subjects without cannabis use (FEPC-, n=78) and healthy controls (n=80) in regard to the frequency of absent or short Adhesio Interthalamica (AI), a well-established marker of intrauterine neurodevelopment. The FEPC+ subgroup had a significantly lower prevalence of absent AI than FEPC- subjects, as well as a lack of a significantly shorter AI length compared to controls (as found in FEPC- subjects). These preliminary results show that psychosis subjects with cannabis use present a low rather than high frequency of absent AI, suggesting that fixed intrauterine neurodevelopmental abnormalities may not be associated with cannabis use later in life to influence on the emergence of psychosis. This is consistent with a view that multiple different etiological processes may lead to similar clinical presentations in patients with FEP.

ABSTRACT The aim of this study was to evaluate the productive performance and nutritional value of seven clover genotypes at three altitude levels (PA I: 2300-2800 m above sea level, PA II: 2801-3300 and PA III: 3301-3800) of the northern highlands of Peru during a year. Four genotypes of white clover (Trifolium repens) and three genotypes of red clover (Trifolium pratense) were installed in each altitudinal floor (PA). The germination power, weight and purity of the seeds were evaluated to ensure the viability of the number of seeds sown. The yield (kg DM ha-1 year-1), growth rate (kg DM ha-1 day-1), plant height (cm) and nutritional value for each genotype were determined. The highest yields and the best growth rates (p<0.01) in the three PAs corresponded to the three varieties of Trifolium pratense (Tuscan, Americano and Relish). PA I (p<0.01) obtained the highest dry matter production (12 340.6 kg DM ha-1 year-1), followed by PA II (7808.4 kg DM ha-1 year-1) and PA III (3923.4 kg DM ha-1 year-1), showing the same trend for the growth rate (p<0.01). Crude protein levels ranged from 19.75 to 23.77% (p=0.009). The results indicate that all genotypes of Trifolium pratense and Trifolium repens should be considered as a good alternative to associate with pastures in the highlands of northern Peru.

RESUMEN El objetivo del estudio fue evaluar el comportamiento productivo y el valor nutricional de siete genotipos de trébol en tres niveles de altitud (PA I: 2300-2800 msnm, PA II: 28013300 msnm y PA III: 3301-3800 msnm) de la sierra norte de Perú durante un año. Se instalaron cuatro genotipos de trébol blanco (Trifolium repens) y tres genotipos de trébol rojo (Trifolium pratense) en cada piso altitudinal (PA). Se evaluó el poder germinativo, peso y pureza de la semilla para asegurar la viabilidad del número de semillas sembradas. Se determinó el rendimiento (kg MS ha-1 año-1), tasa de crecimiento (kg MS ha-1 día-1), altura de la planta (cm) y valor nutricional para cada genotipo. Los rendimientos más altos y las mejores tasas de crecimiento (p<0.01) en los tres PA correspondieron a las tres variedades de Trifolium pratense (Tuscan, Americano y Relish). El PA I (p<0.01) obtuvo la mayor producción de materia seca (12 340.6 kg MS ha-1 año-1), seguido del PA II (7808.4 kg MS ha-1 año-1) y PA III (3923.4 kg MS ha1 año-1), mostrando la misma tendencia para la tasa de crecimiento (p<0.01). Los niveles de proteína cruda variaron de 19.75 a 23.77% (p=0.009). Los resultados encontrados indican que todos los genotipos de Trifolium pratense y Trifolium repens deben considerarse como una buena alternativa para asociarse con pastos en las tierras altas del norte del Perú.

RESUMO Objetivo. Avaliar a associação entre comportamentos relacionados ao uso de álcool durante a pandemia de COVID-19 e quarentena, sintomas de ansiedade e características sociodemográficas na América Latina e no Caribe (ALC). Métodos. Os dados foram coletados em uma pesquisa transversal online (amostra não probabilística) realizada pela Organização Pan-Americana da Saúde (OPAS) em 33 países e dois territórios da ALC entre 22 de maio e 30 de junho de 2020. Participaram da pesquisa pessoas com 18 anos ou mais de idade que não haviam feito viagens ao exterior desde 15 de março de 2020 (n = 12 328, mediana [M] de idade = 38,1 anos, 65% do sexo feminino). Quatro comportamentos relacionados ao uso de álcool (socialização online com o uso de álcool, uso de álcool na presença de crianças, uso de álcool antes das 5 da tarde e episódios de consumo excessivo de álcool) foram as variáveis de resposta e quarentena, sintomas de ansiedade e covariáveis sociodemográficas foram as variáveis explicativas. Resultados. A quarentena teve uma associação positiva com uma maior frequência de socialização online com o uso de álcool e o uso de álcool na presença de crianças, mas demonstrou uma associação negativa com uma maior frequência de episódios de consumo excessivo de álcool. Sintomas de ansiedade foram associados a uma maior frequência de episódios de consumo excessivo de álcool, socialização online com uso de álcool e uso de álcool antes das 5 da tarde. Houve uma aparente associação entre maior nível de renda e todos os comportamentos relacionados ao uso de álcool estudados. As mulheres em geral relataram menos uso de álcool antes das 5 da tarde e menos episódios de consumo excessivo de álcool durante a pandemia. Conclusões. A quarentena durante a pandemia de COVID-19 parece influenciar o comportamento relacionado ao uso de álcool e indicadores de saúde mental, como sintomas de ansiedade. Este é o primeiro estudo que procurou dimensionar a repercussão da quarentena no uso de álcool e na saúde mental das pessoas na ALC durante a pandemia de COVID-19. Diante das associações observadas, recomenda-se rastrear problemas relacionados ao uso de álcool e de saúde mental e oferecer intervenções breves.

ABSTRACT Objective. To assess the association between drinking behaviors during the COVID-19 pandemic and quarantine, anxiety symptoms, and sociodemographic characteristics in Latin America and the Caribbean (LAC). Method. Data was collected through a cross-sectional online survey (non-probabilistic sample) conducted by the Pan American Health Organization between May 22 and June 30, 2020, in 33 countries and two territories of LAC. Participants were 18 years of age or older and must not have traveled outside of their country since March 15, 2020 (n= 12 328, M age= 38.1 years, 65% female). Four drinking behaviors (online socializing drinking [OSD], drinking with child present [DCP], drinking before 5 p.m. [DB5]), heavy episodic drinking [HED]) were response variables, and quarantining, anxiety symptoms and sociodemographic covariables were explanatory variables. Results. Quarantine was positively associated with a higher frequency of OSD and with DCP, but negatively associated with a higher frequency of HED. Anxiety symptoms were associated with a higher frequency of HED, more OSD, and DB5. Higher incomes seemed to be more associated with all the studied drinking behaviors. Women tended to report less DB5 and less HED during the pandemic. Conclusions. Quarantine during the COVID-19 pandemic seems to affect drinking behavior and mental health indicators like anxiety symptoms. This study is the first effort to measure the consequences of the quarantine on alcohol consumption and mental health in LAC during the COVID-19 pandemic. Considering the associations found, screenings and brief interventions targeting alcohol consumption and mental health are recommended.

RESUMEN Objetivo. Evaluar la asociación entre comportamientos relacionados con el consumo de alcohol durante la pandemia de COVID-19 y la cuarentena, los síntomas de ansiedad y las características sociodemográficas en América Latina y el Caribe. Método. Se recopilaron datos mediante una encuesta transversal en línea (muestra no probabilística) realizada por la Organización Panamericana de la Salud entre el 22 de mayo y el 30 de junio del 2020 en 33 países y 2 territorios de América Latina y el Caribe. Los participantes tenían 18 años o más y no tenían que haber viajado fuera de su país después del 15 de marzo del 2020 (n= 12 328, edad M= 38,1 años, 65% mujeres). Las variables de respuesta eran cuatro comportamientos relacionados con el consumo de alcohol: beber socializando en línea, beber en presencia de niños, beber antes de las 5 de la tarde o consumo excesivo episódico. La cuarentena, los síntomas de ansiedad y las covariables sociodemográficas fueron las variables explicativas. Resultados. La cuarentena se relacionó positivamente con una mayor frecuencia de consumo de alcohol socializando en línea y en presencia de niños, pero negativamente con una mayor frecuencia de consumo excesivo episódico. Los síntomas de ansiedad se relacionaron con una mayor frecuencia de consumo excesivo de alcohol, un mayor consumo de alcohol socializando en línea y con beber antes de las 5 de la tarde. Aparentemente los ingresos más altos estuvieron más asociados con todos los comportamientos relacionados con el consumo del alcohol estudiados. Las mujeres tendieron a notificar menos consumo de alcohol antes de las 5 de la tarde y menos consumo excesivo episódico de alcohol durante la pandemia. Conclusiones. La cuarentena durante la pandemia de COVID-19 parece afectar el comportamiento relacionado con el consumo de alcohol y los indicadores de salud mental, como los síntomas de ansiedad. Este estudio es la primera iniciativa para medir las consecuencias de la cuarentena sobre el comportamiento relacionado con el consumo de alcohol y la salud mental en América Latina y el Caribe durante la pandemia de COVID-19. Dadas las asociaciones encontradas, se recomienda llevar a cabo pruebas de tamizaje e intervenciones breves para abordar el consumo del alcohol y la salud mental.

Abstract Background Western countries share an interest in evaluating quality of care in the healthcare field. In spite of this, there is a lack of intercultural comparison of the perceptions of professionals. One reason for this may be the lack of standardized instruments. The objective of this study was to investigate the psychometric properties and dimensions of the Spanish version of the Quality in Psychiatric Care-Inpatients Staff (QPC-IPS) instrument. Methods After translation and revision of the instrument by a panel of experts, a questionnaire was obtained in Spanish that was administered to a pilot sample. A total of 163 professionals participated in the study. Results After conducting pilot testing and a cognitive interview with 30 professionals, it was determined that the QPC-IPS was adequate and could be self-administered. Confirmatory factor analysis confirmed six factors that explained 60.9% of the variation. In terms of internal consistency, a Cronbach's alpha of 0.92 was obtained for the full instrument. For test re-test reliability, the intraclass correlation coefficient for the overall questionnaire was 0.91. Convergent validity was analyzed using the NTP394 satisfaction instrument, yielding a positive correlation (0.58). Conclusions The results demonstrated that the psychometric properties in terms of internal consistency, temporal stability (test-retest), content validity, and construct validity (confirmatory factor analysis) were adequate. These results confirm that the structure of the Spanish version is similar to the original Swedish version of the QPC-IP.

Resumen Fundamento Los países occidentales comparten un interés en evaluar la calidad de la atención en el campo de la salud. A pesar de esto, existe una falta de comparación intercultural de las percepciones de los profesionales. Una razón para esto puede ser la falta de instrumentos estandarizados. El objetivo de este estudio fue investigar las propiedades psicométricas y las dimensiones de la versión española del instrumento Quality in Psychiatric Care-Inpatients Staff (QPC-IPS). Métodos Tras la traducción y revisión del instrumento por un panel de expertos se obtuvo un cuestionario en español que fue administrado a una muestra piloto. La muestra estuvo configurada por 163 profesionales. Resultados Después de realizar una prueba piloto y una entrevista cognitiva con 30 profesionales, se determinó que el QPC-IPS era adecuado y podía autoadministrarse. El análisis factorial confirmatorio confirmó seis factores que explican el 60,9% de la varianza. Mediante el análisis de consistencia interna, se obtuvo un alfa de Cronbach de 0,92 para el total del instrumento. Para la fiabilidad del test-retest, el coeficiente de correlación intraclase para el cuestionario general fue de 0,91. La validez convergente se analizó utilizando el instrumento de satisfacción NTP394, produciendo una correlación positiva (0,58). Conclusiones Los resultados demostraron que las propiedades psicométricas en términos de consistencia interna, estabilidad temporal (test-retest), validez de contenido y validez de constructo (análisis factorial confirmatorio) fueron adecuadas.

Se describió la composición y estructura florística del bosque amazónico de tierra firme del sector Alto Madera de la provincia centrosureña (fide Navarro). Se instalaron cinco parcelas de una hectárea (100x100 m), entre 140 a 156 m de altitud y geográficamente esta de 9 °55'a 10°19'S y 65°34' a 65°46'O; donde, se evaluaron e identificaron todos los árboles y lianas ≥10 cm de DAP. La densidad registrada fue de 480 (±13) arboles/ha y la diversidad promedio fue 152 (±8) especies/ha, 105 (±4) géneros/ha y 45(±2) familias/ha, basados en la evaluación de 2398 árboles y 137 lianas en 5 ha. La estructura se presentó en forma de J invertida, con mayor cantidad de individuos en las clases menores y a medida que aumenta el tamaño el número de individuos disminuye. En este bosque, las especies de mayor importancia ecológica (IVI) fueron Attalea vel. sp. nov. (palla) y Peltogyne heterophylla (morado), seguida de Euterpe precatoria (asaí), Pseudolmedia laevis (nuí peludo), Tetragastris altissima (isigo colorado), Tachigali vasquezii (palo santo colorado), Brosimun lactescens (quecho verde) y Bertholletia excelsa. En conclusión, el bosque de tierra firme del Alto Madera, es el bosque de mayor diversidad arbórea en Bolivia. No obstante, los valores se encuentran en el rango de diversidad para sus latitudes. Además, presentan composición florística diferente a otros bosques amazónico de tierra firme, la dominancia de la palla (Attalea vel. sp. nov.) y el morado (Peltogyne heterophylla) entre otras especies exclusiva le confieren una particularidad florística y fisionómica a esta formación forestal.

We describe the composition and floristic structure of the terra firme Amazon forest of the Alto Madera sector of the Centro-sureñan province (fide Navarro). Five plots of one hectare (100x100 m) were installed at an altitude of 140 to 156 m at the geographically locale 9 "55' to 10°19'S and 65°34' to 65°46'W; with all trees and lianas ≥ 10 cm diameter measured. The density is 480 (± 13) trees/ha and the diversity is greater than at other sites in Bolivia, with an average of 152 (± 8) species/ha, 105 (± 4) genera/ha and 45 (± 2) families/ha, based on the evaluation of 2398 trees and 137 vines. The structure is pyramidal or in the form of an inverted J, with a greater number of individuals in the smaller classes. In this forest, the most ecologically important species are Attalea sp. nov. (palla) and Peltogyne heterophylla (morado), followed by Euterpe precatoria (asaí), Pseudolmedia laevis (nuí peludo), Tetragastris altissima (isigo colorado), Tachigali vasquezii (palo santo colorado), Brosimum lactescens (quecho verde) y Bertholletia excelsa. In conclusion, the Alto Madera terra firme forest is the forest with the greatest tree diversity in Bolivia. However, the values are in the range of diversity of forests of similar latitudes. In addition, they have a floristic composition different from other Amazon forests of the terra firme, the dominance of the palla (Attalea sp. nov.) and the Purple Heart (Peltogyne heterophylla) among other exclusive species giving this formation a floristic and physiognomic particularity to this forest formation.

Resumo O objetivo deste artigo é identificar as características dos programas de prevenção ao uso de drogas desenvolvidos nas escolas brasileiras e verificar a existência de princípios de boas práticas de prevenção nestes programas. Estudo transversal com uma amostra probabilística de 1.151 dirigentes de escolas públicas e privadas. Os dados foram coletados por meio de um questionário online. Regressão de Poisson permitiu identificar os fatores associados à maior quantidade de princípios de boas práticas de prevenção nos programas. Os programas se operacionalizam sem regularidade e com duração média de um trimestre, dirigidos principalmente aos alunos, com integração de diferentes modelos teóricos e promovidos principalmente pela Polícia Militar. As escolas privadas possuem 14% mais chance de apresentarem mais princípios de boas práticas em seus programas, quando comparadas às escolas públicas. Programas ofertados por uma equipe da própria escola ou por uma instituição da área de saúde ou pela secretaria de educação possuem maiores chances de apresentarem mais princípios de boas práticas. As ações de prevenção ao uso drogas nas escolas brasileiras necessitam de aperfeiçoamento das medidas adotadas. Os programas não se baseiam em evidências científicas e boas práticas em prevenção.

Abstract The aim of this study was to identify the main characteristics of school-based drug prevention programs in Brazil and verify whether these interventions apply the prevention principles suggested by the National Institute on Drug Abuse (NIDA). A cross-sectional study was conducted using a random national sample of 1,151 public and private school managers. The data were collected using an online questionnaire. Poisson regression was used to identify factors associated with the application of a greater number of prevention principles in the programs. The findings showed that programs were generally sporadic, had an average duration of one semester, incorporated different program models, and primarily directed at students. The most active organization in the delivery of programs was the Military Police. Private schools were shown to be 14% more likely to apply more good practice principles than public schools. Furthermore, programs delivered by school staff, health institutions, or departments of education were more likely to apply more prevention principles. Efforts are needed to improve drug prevention practice in Brazilian schools. Our findings show that, overall, school-based drug prevention programs do not apply the NIDA prevention principles.

Resumo O objetivo deste artigo é identificar as características dos programas de prevenção ao uso de drogas desenvolvidos nas escolas brasileiras e verificar a existência de princípios de boas práticas de prevenção nestes programas. Estudo transversal com uma amostra probabilística de 1.151 dirigentes de escolas públicas e privadas. Os dados foram coletados por meio de um questionário online. Regressão de Poisson permitiu identificar os fatores associados à maior quantidade de princípios de boas práticas de prevenção nos programas. Os programas se operacionalizam sem regularidade e com duração média de um trimestre, dirigidos principalmente aos alunos, com integração de diferentes modelos teóricos e promovidos principalmente pela Polícia Militar. As escolas privadas possuem 14% mais chance de apresentarem mais princípios de boas práticas em seus programas, quando comparadas às escolas públicas. Programas ofertados por uma equipe da própria escola ou por uma instituição da área de saúde ou pela secretaria de educação possuem maiores chances de apresentarem mais princípios de boas práticas. As ações de prevenção ao uso drogas nas escolas brasileiras necessitam de aperfeiçoamento das medidas adotadas. Os programas não se baseiam em evidências científicas e boas práticas em prevenção.

Abstract The aim of this study was to identify the main characteristics of school-based drug prevention programs in Brazil and verify whether these interventions apply the prevention principles suggested by the National Institute on Drug Abuse (NIDA). A cross-sectional study was conducted using a random national sample of 1,151 public and private school managers. The data were collected using an online questionnaire. Poisson regression was used to identify factors associated with the application of a greater number of prevention principles in the programs. The findings showed that programs were generally sporadic, had an average duration of one semester, incorporated different program models, and primarily directed at students. The most active organization in the delivery of programs was the Military Police. Private schools were shown to be 14% more likely to apply more good practice principles than public schools. Furthermore, programs delivered by school staff, health institutions, or departments of education were more likely to apply more prevention principles. Efforts are needed to improve drug prevention practice in Brazilian schools. Our findings show that, overall, school-based drug prevention programs do not apply the NIDA prevention principles.

ABSTRACT The objective of this work is to determine the influence of several osmotic solutions obtained through the process of combined dehydration of pineapple for its conservation, for which a methodology was developed from an experimental analysis and an evaluation of experts that made it possible to determine that The solution of Sucrose Syrup BD of all osmotic solutions (SO) better guaranteed the organoleptic properties of the fruit. Statistical analysis determined that of the three SOs that contributed most solute gains were Sucrose Syrup BD (66%), Honey B (64%) and Honey B reduced (63%) respectively, as well as the greatest weight loss for fruit slices it was from Honey C reduced (78%), Honey B and Honey A reduced by 76%. Finally, by means of a multiple linear regression analysis, it was possible to evaluate the influence of the variables (oBrix,% of Water, Temperature) of the Sacarosa BD Syrup on the weight of the fruit and obtain the model W e i g h t _ F r u i t B D = − 793,779 + 13,5751 ⋅ ° B r i x − 11,4982 ⋅ % o f W a t e r + 10,6665 ⋅ T e m p e r a t u r e for a value of R2 of 0.75, indicating the correct fit of the model for the conditions evaluated in the study.

RESUMEN En el presente estudio se evaluó la influencia de varias soluciones osmóticas en el proceso de deshidratación combinada de la piña para su conservación. Se elaboró una metodología a partir de un análisis experimental y una evaluación de expertos que posibilitó determinar que la solución de Jarabe de Sacarosa BD de todas las soluciones osmóticas (SO) garantizaba en mejor medida las propiedades organolépticas de la fruta. El análisis estadístico determinó que de los tres SO que más ganancias de solutos aportaron fueron el Jarabe de Sacarosa BD (66%), Miel B (64%) y la Miel B rebajada (63%) respectivamente, así como la mayor pérdida de peso para las rodajas de frutas fue a partir de la Miel C rebajada (78%), la Miel B y Miel A rebajada con un 76%. Finalmente mediante un análisis de regresión lineal múltiple fue posible evaluar la influencia de las variables (oBrix,% de Agua, Temperatura) del Jarabe de Sacarosa BD en el peso de la fruta y obtener el modelo P e s o _ F r u t a B D = − 793,779 + 13,5751 ⋅ ° B r i x − 11,4982 ⋅ % d e A g u a + 10,6665 ⋅ T e m p e r a t u r a. El valor de temperatura en la ecuación es para un valor de R2 de 0,75, lo que indica el ajuste correcto del modelo para las condiciones evaluadas en el estudio.

Resumen En ecología una de las preguntas más importantes es: ¿cuáles son los factores ambientales que explican la alta diversidad de especies de plantas en los bosques tropicales? En este trabajo, se estudiaron las comunidades de palmas y su relación con los nutrientes del suelo en dos localidades del Chocó biogeográfico. Específicamente, se investigó: (1) cómo varían los nutrientes del suelo entre las dos localidades; (2) cuál es la relación entre los nutrientes del suelo y la composición florística de palmas; (3) cuáles son los nutrientes más importantes que explican la variación en la composición florística de las comunidades de palmas; y (4) cómo varía la abundancia de las especies dominantes de sotobosque y de dosel a lo largo del gradiente de concentración de los nutrientes más importantes. Se realizaron 20 transectos de 500 x 5 m (5 ha), en los cuales se identificaron y contaron todos los individuos de palmas en sus diferentes estadios de crecimiento. Las muestras de suelo se tomaron en cada uno de los transectos a los 0 , 250 y 500 m. Los cationes (Al, Ca, Mg, K, P) se extrajeron con la técnica Mehlich-III y las concentraciones se analizaron con espectrometría de emisión con plasma de acoplamiento inductivo (ICP-OES). La concentración de macronutrientes se relacionó con la composición florística mediante el test de Mantel, el test parcial de Mantel, regresiones lineales y escalamiento multidimensional no métrico (NMDS). Se encontraron 9 158 individuos y 33 especies de palmas en las 5 ha cubiertas por los transectos. La composición florística presentó una correlación positiva y significativa con los nutrientes del suelo (rM = 0.63-0.69) y con la distancia geográfica entre los transectos (rM = 0.71-0.75), mientras que las variables edáficas mostraron una alta correlación con la distancia geográfica (rM = 0.72). Asimismo, se encontró una débil relación significativa entre la fertilidad del suelo y la abundancia de palmas de sotobosque, pero ninguna con las palmas del dosel. Nuestros resultados demuestran que los suelos juegan un papel importante en la composición de las comunidades de palmas a escalas locales en la región del Chocó, y que los suelos más pobres y ricos en fósforo presentan la mayor diversidad de palmas.

Abstract One of the most important questions in ecology is: which are the environmental factors that explain the high plant diversity of tropical forests? We studied the floristic composition of palm communities and their relationship to soil nutrients in two localities of the Chocó region to understand (1) how soil nutrients vary between the two localities; (2) what is the relationship between soil nutrients and palm floristic composition; (3) what are the most important nutrients that explain the variation in floristic composition of palm communities; and (4) how does the abundance of the most exuberant understory and canopy palm species vary along the concentration gradient of the most important nutrients? We established 20 transects (5 x 500 m) and identified all palm individuals of all growth stages. Soil samples were taken at each transect at the beginning, middle, and end. Macronutrients (Al, Ca, Mg, K, P) were extracted with the Mehlich-III technique and their concentrations were analyzed by inductively coupled plasma emission spectrometry (ICP-OES). We used Mantel test, partial Mantel tests, linear regressions, and non-metric multidimensional scaling to determine if the concentration of nutrients was related to the floristic composition. We found a total of 9 158 individuals and 33 species of palms in the 5 ha covered by our transects. Floristic composition had a positive and significant correlation with soil nutrients (rM = 0.63-0.69) and with geographical distance between transects (rM= 0.71-0.75), whereas the soil nutrients were highly correlated with geographical distance (rM = 0.72). We also found a small, yet significant, relationship between soil fertility and the abundance of understory palms, but no relationship with canopy palms. Our results demonstrate for the first time that soils play an important role in the composition of palm communities at local scales in the Chocó region, and that infertile and phosphorus-rich soils have the highest palm diversity.

The ways in which pedagogical practices have evolved and how to understand the teaching and learning process are different. With the use of the Internet, the sources of information and evaluation are amplified, and educational agents within virtual education play an important role, reflecting on a new paradigm of learning and knowledge construction. From the theoretical review carried out in this document, aspects for virtual education and the tendency to an evaluative practice that does not deal exclusively with the classroom are exposed, since the intercommunication tools become and contribute to a new pedagogical practice focused on learning, giving rise to a more active role for students.

Son diferentes las formas que han evolucionado las prácticas pedagógicas y la manera de comprender el proceso de enseñanza y aprendizaje. Con el uso del internet las fuentes de información y de evaluación se amplifican, y los agentes educativos dentro de la formación virtual cumplen un rol de importancia, reflexionando sobre un nuevo paradigma de aprendizaje y de construcción del conocimiento. Desde la revisión teórica llevada a cabo en la presente investigación, se exponen aspectos que orientan a una educación virtual y la tendencia a una práctica evaluativa que no se circunscribe al aula, pues las herramientas de intercomunicación se convierten y contribuyen en una nueva práctica pedagógica centrada en el aprendizaje, dando lugar a un rol más activo a los estudiantes.

Abstract Biennial variations of marine palynomorph concentrations mirrored oceanographic conditions in the Magdalena Basin, Baja California Sur (Mexico), in the period from 1811 to 1907 (common era, CE), for which the sea surface temperature index (SSTI) showed predominantly negative anomalies. We analyzed 49 samples of laminated sediments taken from a core extracted at a water depth of 520 m. Changes in dinoflagellate assemblages and copepod egg abundances were compared to SSTI records and to El Niño Southern Oscillation (ENSO) and Pacific Decadal Oscillation (PDO) reconstructions. Copepods were the most abundant and showed a significant correlation with SSTI. Among the dinoflagellates, heterotrophs were the most abundant and did not correlate with SSTI. The lowest concentration of autotrophs showed a significant and inverse correlation with SSTI. The canonical correlation analysis also indicated that copepods and autotrophs were modulated by variations in SSTI. Dinoflagellate richness and concentrations and copepod egg concentrations were low, indicating low productivity, and these values coincided with the negative SSTI anomalies. In contrast, the increase in concentrations from 1881 to 1907 CE coincided with positive SSTI anomalies. Also, even when marine palynomorphs showed no significant correlation with either ENSO or PDO, their concentrations increased during age intervals with combined negative conditions (La Niña, negative PDO) and decreased during combined warm conditions (El Niño, positive PDO).

Resumen Las variaciones bianuales de las concentraciones de palinomorfos marinos reflejaron las condiciones oceanográficas en la cuenca Magdalena, Baja California Sur (México), en el periodo de 1811 a 1907 (era común, EC), para el cual el índice de la temperatura superficial del mar (ITSM) demostró, predominantemente, anomalías negativas. Se analizaron 49 muestras de sedimentos laminados tomadas de un núcleo extraído a 520 m de profundidad del agua. Los cambios observados en los conjuntos de quistes de dinoflagelados y las abundancias de huevos de copépodos fueron comparadas con registros del ITSM y reconstrucciones de El Niño Oscilación del Sur (ENOS) y la Oscilación Decenal del Pacífico (ODP). Los copépodos fueron los más abundantes y presentaron una correlación significativa con el ITSM. Entre los dinoflagelados, los heterótrofos fueron los más abundantes y no se correlacionaron con el ITSM. La concentración más baja de autótrofos mostró una correlación significativa e inversa con el ITSM. El análisis de correlación canónica también indicó que las abundancias de copépodos y autótrofos estuvieron modulados por las variaciones del ITSM. La riqueza y la concentración de dinoflagelados, así como las concentraciones de huevos de copépodos, fueron bajas, indicativo de baja productividad, y coincidieron con las anomalías negativas del ITSM. En contraste, se observó un incremento en las concentraciones de 1881 a 1907 EC, correspondiente a un aumento del ITSM. Además, aunque los palinomorfos marinos no mostraron una correlación significativa con ENOS ni con la ODP, las concentraciones aumentaron cuando se presentó la combinación de condiciones negativas de estos índices (La Niña, ODP negativa), pero disminuyeron en condiciones cálidas combinadas (El Niño, OPD positiva).