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Id: biblio-1151626
Autor: Mungmungpuntipantip, Rujittika; Wiwanitkit, Viroj.
Título: Correlation between rainfall and the prevalence of scrub typhus: an observation from a tropical endemic country / Correlación entre las precipitaciones y la prevalencia del tifus de matorral: una observación de un país endémico para enfermedades tropicales
Fonte: Int. j. med. surg. sci. (Print);8(1):1-4, mar. 2021. ilus.
Idioma: en.
Resumo: The effect of climatological parameter on infectious disease is an interesting issue in clinical epidemiology. Of several parameters, rainfall is reported for its interrelationship with many tropical diseases such as malaria. In this short communication, the authors report the observation on correlation between rainfall and the prevalence of scrub typhus from a tropical endemic country.

El efecto del parámetro climatológico en las enfermedades infecciosas es un tema interesante en la epidemiología clínica. De varios parámetros, se reportan precipitaciones por su interrelación con muchas enfermedades tropicales como el paludismo. En esta breve comunicación, los autores informan de la observación sobre la correlación entre las precipitaciones y la prevalencia del tifus de matorral de un país endémico tropical.
Descritores: Chuva
Tifo por Ácaros/etiologia
Prevalência
-Tailândia
Clima Tropical
Doenças Endêmicas
Responsável: CL61.1 - Biblioteca Central Campus Sur


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Id: biblio-1041904
Autor: Monge-Nájera, Julián.
Título: Relative humidity, temperature, substrate type, and height of terrestrial lichens in a tropical paramo / Humedad relativa, temperatura, tipo de sustrato y altura de los líquenes del suelo en un páramo tropical
Fonte: Rev. biol. trop;67(1):206-212, Jan.-Mar. 2019. tab, graf.
Idioma: en.
Resumo: Abstract Lichens are traditionally divided into types such as "crustose", "foliose" and "fruticose", with different shapes and heights. Substrate, temperature and water are thought to affect lichen height, but there are few studies regarding tropical paramo lichens. Along 2015 I measured those variables in the terricolous lichens of the Cerro Buena Vista, paramo (Costa Rica, 9°33' N & 83°45' W). The measurements were taken inside the lichens and in the substrate under them, in 61 randomly located quadrats (50 x 50 cm). Lichens grew taller on (1) warmer ground, (2) wetter ground, (3) the moister Caribbean slope, and (4) the season with heavier rainfall, as expected. Apparently, atmospheric factors are more important than substrate in the determination of temperature, relative humidity and growth of lichens. Physiologically available water seems to be the main determinant of lichen vertical growth in the Buena Vista paramo.(AU)

Resumen Los líquenes se dividen tradicionalmente en morfotipos como "crustoso", "folioso" y "fruticoso", con diferentes formas y alturas. Se cree que el sustrato, la temperatura y el agua afectan la altura de los líquenes, pero existen pocos estudios con respecto a los líquenes tropicales. A lo largo del 2015, medí esas variables en los líquenes del suelo en el páramo de Cerro Buena Vista (Costa Rica, 9 ° 33'N; 83 ° 45'W). Las medidas se tomaron dentro de los líquenes y en el sustrato debajo de ellos, en 61 cuadrantes ubicados al azar (50 x 50 cm). Los líquenes fueron más altos en (1) suelo más cálido, (2) suelo más húmedo, (3) la pendiente del Caribe, que es más húmeda y (4) la temporada con lluvias más intensas, como se esperaba. Aparentemente, los factores atmosféricos son más importantes que el sustrato en la determinación de la temperatura, la humedad relativa y el crecimiento de los líquenes. El agua fisiológicamente disponible parece ser el principal determinante del crecimiento vertical de los líquenes en el páramo del Cerro Buena Vista.(AU)
Descritores: Clima Tropical
Ecossistema Tropical
Fenômenos Físicos
Líquens/crescimento & desenvolvimento
-Costa Rica
Responsável: BR1.1 - BIREME


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Texto completo SciELO Brasil
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Id: lil-448118
Autor: Falcão, Newton Paulo de Souza; Borges, Lillian França.
Título: Efeito da fertilidade de terra preta de índio da Amazônia Central no estado nutricional e na produtividade do mamão hawaí (Carica papaya L) / Effect of amazonian dark earth fertility on nutritional status and fruit production of papaya(Carica papaya L)in Central Amazonia
Fonte: Acta amaz;36(4):401-406, out.-dez. 2006.
Idioma: pt.
Resumo: Com o objetivo de avaliar o efeito da fertilidade de solos antropogênicos no estado nutricional e na produtividade do mamão Havaí (Carica papaya L.), conduziu-se o presente estudo em um plantio, localizado na Costa do Açutuba, Iranduba, AM, em Latossolo Amarelo antrópico em plantas com oito meses de idade e no início da produção de frutos, no período de agosto a outubro de 2003. O delineamento experimental foi inteiramente casualizado, com quatro tratamentos e nove repetições, constituídos de uma amostra composta por três plantas e trinta e seis unidades experimentais, sendo os tratamentos Tpn = plantio em terra preta não adubada; Tpa = plantio em terra preta adubada; Tm1 = plantio em terra mulata não adubada; Tm2 = plantio em terra mulata com um ano de pousio. O tratamento que apresentou maior produção foi o Tpa, com média de 61,10 frutos/planta, e o que apresentou menor produção foi o Tpn, com média de 18,18 frutos/planta. A acidez potencial em todos os tratamentos apresentou-se em níveis médios, mesmo com o manejo da fertilidade praticado nos últimos anos. Observou-se um desbalanço nutricional provocado pelos altos teores de P, Ca, Mg e baixo teor de K; todos os tratamentos apresentaram teores de Zn e Mn considerados tóxicos, enquanto que o Fe apresentou níveis adequados.

The effect of Amazonian dark earth fertility on the nutritional status and fruit production of a Carica papaya plantation was evaluated in Açutuba Coast, Iranduba Municipality, Amazonas, Brazil, between August and Octuber 2003, when the plantation was eight months old and just starting production. A completely randomized experimental design, with four treatments and nine replications, was used; each replication contained three plants. The treatment were: Tpn - Amazonian Dark Earth with no supplemental fertilizer; Tpa - Amazonian Dark Earth with supplemental fertilizer (3 kg aged chicken manure and 300 g dolomite per plant); Tm1 - Mulata Earth with no supplemental fertilizer after cropping with squash; Tm2 - Mulata Earth with no supplemental fertilizer after slashing and burning fallow. The fruit production on Tpn (18.2 fruits/plant) was approximately 30 percent of the maximum production obtained on Tpa (61.1 fruits/plant); this effect was attributed to K which is low in Tpn and higher in Tpa because of the chicken manure. The potential acidity in all treatments was as expected in TP or TM, without apparent effect of previous soil management. There appeared to be a very large nutritional disequilibrium, caused by the high levels of P, Ca, Mg and low level of K. All treatments had levels Zn and Mn that are considered toxic, whereas Fe was suitable.
Descritores: Plantas
Clima Tropical
Ciências da Nutrição
Frutas
Responsável: BR6.1 - BCS - Biblioteca de Ciências da Saúde


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Id: lil-504709
Autor: Hayasida, Willian; Sousa, Arlison Silva de; Lima, Maria da Paz; Nascimento, Claudete Catanhede do; Ferreira, Antonio Gilberto.
Título: Proposta de aproveitamento em resíduos de pau-rainha (Brosimum rubescens) descartados pelo setor madeireiro / Proposal of profite in residues of \"pau-rainha\" (Brosimum rubescens) discarded for the lumber sector
Fonte: Acta amaz;38(4):749-752, dez. 2008. ilus, tab.
Idioma: pt.
Resumo: A indústria da madeira do estado de Amazonas (Brasil) contribui com a produção de uma quantidade grande de resíduos. Este trabalho visa indicar o uso final para espécie florestal pau-rainha (Brosimum rubescens Taubert, Moraceae). Os resíduos descartados durante o processamento mecânico da madeira foram utilizados na confecção de artefatos como: instrumentos musicais e artigos decorativos gerando resíduos menores (serragens). Foram obtidos extratos das serragens do cerne e alburno por maceração com hexano e metanol. O teor extrativo no cerne foi 19,87 por cento e a porcentagem (com relação a serragem) de xantiletina (2,2-dimetilcromeno cumarina) obtida foi 2,35 por cento. Não foi detectada a cumarina nos extratos do alburno. A xantiletina é reportada pelas atividades antiplaquetária, antifúngica e herbicida e alguns derivados possuem atividade em linhagens de células leucêmicas. A proposta de uso final adequado dos resíduos de pau-rainha para confecção de artefatos tem uma grande importância social e a busca de metabólitos secundários é bastante promissora pois estes podem ser transformados em novos produtos.

Timber industry of Amazonas state (Brazil) contribute with the production of great amount of residues. This paper aims to indicating end-uses for this forest species pau-rainha (Brosimum rubescens Taubert, Moraceae). The residues discharged during the mechanical processing in timber production were used as manufactured goods such as: musical instruments and decorative articles generating less wastes in sawmills. They were carried sawdust of the heartwood and sapwood and extraction by maceration with hexane and methanol. The heartwood extractive yield was 19.87 percent and content of xanthyletin (2,2-dimethylchromene coumarin) was 2.35 percent with basis dry mass. It was not detected the coumarin in extracts of sapwood. Xanthyletin is reported as antiplatelet, antifungal and herbicide and some its derivatives have a leukaemic cells lineage activities. The proposal of adequate end-uses of "pau-rainha" as manufacture-goods is a great social benefit and the search of secondary metabolites is quite promising it can be transformed into novel products.
Descritores: Clima Tropical
Resíduos
Madeira
Responsável: BR6.1 - BCS - Biblioteca de Ciências da Saúde


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Id: biblio-886622
Autor: MOURA, RENAN F; DAWSON, DEBORAH A; NOGUEIRA, DENISE M.
Título: The use of microsatellite markers in Neotropical studies of wild birds: a literature review
Fonte: An. acad. bras. ciênc;89(1):145-154, Jan,-Mar. 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Despite extensive habitat fragmentation, the Neotropical region possesses 30% of the world´s bird species. Microsatellites have remained one of the most popular genetic markers and have been used in ecological and conservation studies since the 1990's. We conducted a literature review comparing the number of papers published from January 1990 to July 2015 that used microsatellite markers for studies of wild birds in the Neotropical region, USA and some European countries. We assigned the articles to three categories of studies: population genetics, animal behavior/kinship analysis and the development of species-specific bird microsatellite markers. We also compared the studies in the Neotropics that used heterologous versus species-specific markers and provide a list of heterologous markers of utility in multiple birds. Despite the rich bird fauna in the Neotropics, the number of articles published represents only 5.6% of that published by the USA and selected European countries. Within the Neotropical region, Brazil possessed 60.5% of the total papers published, with the remaining 39.5% shared between five countries. We conclude that the lack of specialized laboratories and resources still represents a limit to microsatellite-based genetic studies of birds within the Neotropical region. To overcome these limitations, we suggest the use of heterologous microsatellite markers as a cost-effective and time-effective tool to assist ecological studies of wild birds.
Descritores: Aves/genética
Repetições de Microssatélites
Animais Selvagens/genética
-Especificidade da Espécie
Clima Tropical
Variação Genética
Limites: Animais
Tipo de Publ: Revisão
Responsável: BR1.1 - BIREME


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Id: biblio-886637
Autor: GARCIA, LETÍCIA C; BARROS, FERNANDA V; LEMOS-FILHO, JOSÉ P.
Título: Environmental drivers on leaf phenology of ironstone outcrops species under seasonal climate
Fonte: An. acad. bras. ciênc;89(1):131-143, Jan,-Mar. 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Banded iron formations (BIF) have a particular vegetation type and provide a good model system for testing theories related to leaf phenology, due to unique stressful environmental conditions. As a consequence of the stressful conditions of BIF environment, we hypothesize that most species would retain at least some significant canopy cover, even at the end of the dry season, independently of growth form - trees, shrubs, and sub-shrubs. Considering the strong seasonality, we also hypothesize that photoperiod and rainfall act as triggers for leaf fall and leaf flushing in these environments. The majority of the fifteen studied species had a semi-deciduous behavior and shed their leaves mainly during the dry season, with a recovery at the end of this season. In general, leaf flushing increased around the spring equinox (end of the dry season and start of the rainy season). A trade-off between leaf loss and leaf maintenance is expected in a community in which most plants are naturally selected to be semi-deciduous. Our results suggest photoperiod as a dominant factor in predicting leaf phenology.
Descritores: Estações do Ano
Solo/química
Clima Tropical
Folhas de Planta/fisiologia
Ferro/química
-Chuva
Temperatura
Fatores de Tempo
Árvores/fisiologia
Brasil
Fotoperíodo
Ecossistema
Responsável: BR1.1 - BIREME


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Id: biblio-886706
Autor: LIMA, ROBSON B DE; BUFALINO, LINA; ALVES JUNIOR, FRANCISCO T; SILVA, JOSÉ A A DA; FERREIRA, RINALDO L C.
Título: Diameter distribution in a Brazilian tropical dry forest domain: predictions for the stand and species
Fonte: An. acad. bras. ciênc;89(2):1189-1203, Apr.-June 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Currently, there is a lack of studies on the correct utilization of continuous distributions for dry tropical forests. Therefore, this work aims to investigate the diameter structure of a brazilian tropical dry forest and to select suitable continuous distributions by means of statistic tools for the stand and the main species. Two subsets were randomly selected from 40 plots. Diameter at base height was obtained. The following functions were tested: log-normal; gamma; Weibull 2P and Burr. The best fits were selected by Akaike's information validation criterion. Overall, the diameter distribution of the dry tropical forest was better described by negative exponential curves and positive skewness. The forest studied showed diameter distributions with decreasing probability for larger trees. This behavior was observed for both the main species and the stand. The generalization of the function fitted for the main species show that the development of individual models is needed. The Burr function showed good flexibility to describe the diameter structure of the stand and the behavior of Mimosa ophthalmocentra and Bauhinia cheilantha species. For Poincianella bracteosa, Aspidosperma pyrifolium and Myracrodum urundeuva better fitting was obtained with the log-normal function.
Descritores: Árvores/crescimento & desenvolvimento
Clima Tropical
Florestas
Dispersão Vegetal/fisiologia
-Valores de Referência
Árvores/classificação
Brasil
Estatísticas não Paramétricas
Anacardiaceae/crescimento & desenvolvimento
Aspidosperma/crescimento & desenvolvimento
Caesalpinia/crescimento & desenvolvimento
Bauhinia/crescimento & desenvolvimento
Mimosa/crescimento & desenvolvimento
Biodiversidade
Mapeamento Geográfico
Responsável: BR1.1 - BIREME


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Id: biblio-886715
Autor: ESTRADA, GUSTAVO C D; SOARES, MÁRIO L G.
Título: Global patterns of aboveground carbon stock and sequestration in mangroves
Fonte: An. acad. bras. ciênc;89(2):973-989, Apr.-June 2017. tab, graf.
Idioma: en.
Projeto: INCT AmbTropic - Brazilian National Institute of Science and Technology for Tropical Marine Environments, CNPq/FAPESB.
Resumo: ABSTRACT In order to contribute to understand the factors that control the provisioning of the ecosystem service of carbon storage by mangroves, data on carbon stock and sequestration in the aboveground biomass (AGB) from 73 articles were averaged and tested for the dependence on latitude, climatic parameters, physiographic types and age. Global means of carbon stock (78.0 ± 64.5 tC.ha-1) and sequestration (2.9 ± 2.2 tC.ha-1.yr-1) showed that mangroves are among the forest ecosystems with greater capacity of carbon storage in AGB per area. On the global scale, carbon stock increases toward the equator (R²=0.22) and is dependent on 13 climatic parameters, which can be integrated in the following predictive equation: Carbon Stock in AGB = -16.342 + (8.341 x Isothermality) + (0.021 x Annual Precipitation) [R²=0.34; p < 0.05]. It was shown that almost 70% of carbon stock variability is explained by age. Carbon stock and sequestration also vary according to physiographic types, indicating the importance of hydroperiod and edaphic parameters to the local variability of carbon stock. By demonstrating the contribution of local and regional-global factors to carbon stock, this study provides information to the forecast of the effects of future climate changes and local anthropogenic forcings on this ecosystem service.
Descritores: Carbono/análise
Carbono/química
Áreas Alagadas
Sequestro de Carbono
-Valores de Referência
Clima Tropical
Análise de Regressão
Análise de Variância
Biomassa
Tipo de Publ: Revisão
Responsável: BR1.1 - BIREME


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Id: biblio-886723
Autor: LIMA, ROBSON B DE; ALVES JÚNIOR, FRANCISCO T; OLIVEIRA, CINTHIA P DE; SILVA, JOSÉ A A DA; FERREIRA, RINALDO L C.
Título: Predicting of biomass in Brazilian tropical dry forest: a statistical evaluation of generic equations
Fonte: An. acad. bras. ciênc;89(3):1815-1828, July-Sept. 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Dry tropical forests are a key component in the global carbon cycle and their biomass estimates depend almost exclusively of fitted equations for multi-species or individual species data. Therefore, a systematic evaluation of statistical models through validation of estimates of aboveground biomass stocks is justifiable. In this study was analyzed the capacity of generic and specific equations obtained from different locations in Mexico and Brazil, to estimate aboveground biomass at multi-species levels and for four different species. Generic equations developed in Mexico and Brazil performed better in estimating tree biomass for multi-species data. For Poincianella bracteosa and Mimosa ophthalmocentra, only the Sampaio and Silva (2005) generic equation was the most recommended. These equations indicate lower tendency and lower bias, and biomass estimates for these equations are similar. For the species Mimosa tenuiflora, Aspidosperma pyrifolium and for the genus Croton the specific regional equations are more recommended, although the generic equation of Sampaio and Silva (2005) is not discarded for biomass estimates. Models considering gender, families, successional groups, climatic variables and wood specific gravity should be adjusted, tested and the resulting equations should be validated at both local and regional levels as well as on the scales of tropics with dry forest dominance.
Descritores: Florestas
Biomassa
-Clima Tropical
Brasil
Monitoramento Ambiental
Modelos Estatísticos
México
Responsável: BR1.1 - BIREME


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Id: biblio-886731
Autor: SILVA, CARLOS A; KLAUBERG, CARINE; HUDAK, ANDREW T; VIERLING, LEE A; FENNEMA, SCOTT J; CORTE, ANA PAULA D.
Título: Modeling and mapping basal area of Pinus taeda L. plantation using airborne LiDAR data
Fonte: An. acad. bras. ciênc;89(3):1895-1905, July-Sept. 2017. tab, graf.
Idioma: en.
Projeto: Conselho Nacional de Desenvolvimento Científico e Tecnológico.
Resumo: ABSTRACT Basal area (BA) is a good predictor of timber stand volume and forest growth. This study developed predictive models using field and airborne LiDAR (Light Detection and Ranging) data for estimation of basal area in Pinus taeda plantation in south Brazil. In the field, BA was collected from conventional forest inventory plots. Multiple linear regression models for predicting BA from LiDAR-derived metrics were developed and evaluated for predictive power and parsimony. The best model to predict BA from a family of six models was selected based on corrected Akaike Information Criterion (AICc) and assessed by the adjusted coefficient of determination (adj. R²) and root mean square error (RMSE). The best model revealed an adj. R²=0.93 and RMSE=7.74%. Leave one out cross-validation of the best regression model was also computed, and revealed an adj. R² and RMSE of 0.92 and 8.31%, respectively. This study showed that LiDAR-derived metrics can be used to predict BA in Pinus taeda plantations in south Brazil with high precision. We conclude that there is good potential to monitor growth in this type of plantations using airborne LiDAR. We hope that the promising results for BA modeling presented herein will stimulate to operate this technology in Brazil.
Descritores: Florestas
Pinus taeda/crescimento & desenvolvimento
-Clima Tropical
Brasil
Biomassa
Tecnologia de Sensoriamento Remoto
Modelos Teóricos
Responsável: BR1.1 - BIREME



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