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Melo, Vânia Maria Maciel
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Id: biblio-1039267
Autor: Araujo, Ademir Sergio Ferreira de; Mendes, Lucas Wiliam; Bezerra, Walderly Melgaço; Nunes, Luis Alfredo Pinheiro Leal; Lyra, Maria do Carmo Catanho Pereira de; Figueiredo, Marcia do Vale Barreto; Melo, Vania Maria Maciel.
Título: Archaea diversity in vegetation gradients from the Brazilian Cerrado
Fonte: Braz. j. microbiol;49(3):522-528, July-Sept. 2018. tab, graf.
Idioma: en.
Projeto: FAPEPI/CNPq.
Resumo: Abstract We used 16S rRNA sequencing to assess the archaeal communities across a gradient of Cerrado. The archaeal communities differed across the gradient. Crenarcheota was the most abundant phyla, with Nitrosphaerales and NRPJ as the predominant classes. Euryachaeota was also found across the Cerrado gradient, including the classes Metanocellales and Methanomassiliicoccaceae.
Descritores: Plantas/microbiologia
Microbiologia do Solo
Archaea/isolamento & purificação
-Filogenia
Plantas/classificação
Solo/química
Brasil
Archaea/classificação
Archaea/crescimento & desenvolvimento
Archaea/genética
Biodiversidade
Desenvolvimento Vegetal
Responsável: BR1.1 - BIREME


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Id: biblio-951793
Autor: Wu, Xiukun; Zhang, Gaosen; Zhang, Wei; Liu, Guangxiu; Chen, Tuo; Wang, Yun; Long, Haozhi; Tai, Xisheng; Zhang, Baogui; Li, Zhongqin.
Título: Variations in culturable bacterial communities and biochemical properties in the foreland of the retreating Tianshan No. 1 glacier
Fonte: Braz. j. microbiol;49(3):443-451, July-Sept. 2018. tab, graf.
Idioma: en.
Projeto: Natural Science Foundation of China; . National Basic Research Program (973) of China; . China Postdoctoral Science Fund.
Resumo: Abstract As a glacier retreats, barren areas are exposed, and these barren areas are ideal sites to study microbial succession. In this study, we characterized the soil culturable bacterial communities and biochemical parameters of early successional soils from a receding glacier in the Tianshan Mountains. The total number of culturable bacteria ranged from 2.19 × 105 to 1.30 × 106 CFU g-1 dw and from 9.33 × 105 to 2.53 × 106 CFU g-1 dw at 4 °C and 25 °C, respectively. The number of culturable bacteria in the soil increased at 25 °C but decreased at 4 °C along the chronosequence. The total organic carbon, total nitrogen content, and enzymatic activity were relatively low in the glacier foreland. The number of culturable bacteria isolated at 25 °C was significantly positively correlated with the TOC and TN as well as the soil urease, protease, polyphenoloxidase, sucrase, catalase, and dehydrogenase activities. We obtained 358 isolates from the glacier foreland soils that clustered into 35 groups using amplified ribosomal DNA restriction analysis. These groups are affiliated with 20 genera that belong to six taxa, namely, Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Actinobacteria, Bacteroides, and Deinococcus-Thermus, with a predominance of members of Actinobacteria and Proteobacteria in all of the samples. A redundancy analysis showed that the bacterial succession was divided into three periods, an early stage (10a), a middle stage (25-74a), and a late stage (100-130a), with the total number of culturable bacteria mainly being affected by the soil enzymatic activity, suggesting that the microbial succession correlated with the soil age along the foreland.
Descritores: Bactérias/isolamento & purificação
Camada de Gelo/microbiologia
Camada de Gelo/química
-Filogenia
Solo/química
Microbiologia do Solo
Bactérias/classificação
Bactérias/crescimento & desenvolvimento
Bactérias/genética
DNA Bacteriano/genética
DNA Ribossômico/genética
RNA Ribossômico 16S/genética
China
Análise de Sequência de DNA
Nitrogênio/análise
Nitrogênio/metabolismo
Responsável: BR1.1 - BIREME


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Id: biblio-974310
Autor: Souza, Renata Carolini; Cantão, Maurício Egídio; Nogueira, Marco Antonio; Vasconcelos, Ana Tereza Ribeiro; Hungria, Mariangela.
Título: Outstanding impact of soil tillage on the abundance of soil hydrolases revealed by a metagenomic approach
Fonte: Braz. j. microbiol;49(4):723-730, Oct.-Dec. 2018. graf.
Idioma: en.
Projeto: CNPq-Universal; . CNPq; . Embrapa.
Resumo: ABSTRACT The soil represents the main source of novel biocatalysts and biomolecules of industrial relevance. We searched for hydrolases in silico in four shotgun metagenomes (4,079,223 sequences) obtained in a 13-year field trial carried out in southern Brazil, under the no-tillage (NT), or conventional tillage (CT) managements, with crop succession (CS, soybean/wheat), or crop rotation (CR, soybean/maize/wheat/lupine/oat). We identified 42,631 hydrolases belonging to five classes by comparing with the KEGG database, and 44,928 sequences by comparing with the NCBI-NR database. The abundance followed the order: lipases > laccases > cellulases > proteases > amylases > pectinases. Statistically significant differences were attributed to the tillage system, with the NT showing about five times more hydrolases than the CT system. The outstanding differences can be attributed to the management of crop residues, left on the soil surface in the NT, and mechanically broken and incorporated into the soil in the CT. Differences between the CS and the CR were slighter, 10% higher for the CS, but not statistically different. Most of the sequences belonged to fungi (Verticillium, and Colletotrichum for lipases and laccases, and Aspergillus for proteases), and to the archaea Sulfolobus acidocaldarius for amylases. Our results indicate that agricultural soils under conservative managements may represent a hotspot for bioprospection of hydrolases.
Descritores: Solo/química
Proteínas Fúngicas/genética
Archaea/enzimologia
Proteínas Arqueais/genética
Fungos/enzimologia
Hidrolases/genética
-Microbiologia do Solo
Feijão de Soja/crescimento & desenvolvimento
Triticum/crescimento & desenvolvimento
Brasil
Archaea/isolamento & purificação
Archaea/classificação
Archaea/genética
Zea mays/crescimento & desenvolvimento
Agricultura
Metagenoma
Metagenômica
Fungos/isolamento & purificação
Fungos/classificação
Fungos/genética
Responsável: BR1.1 - BIREME


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Id: biblio-1049225
Autor: Kamimura, Karina Marie; Dias Júnior, Moacir de Souza; Oliveira, Marcelo Silva de; Santos, Gérson Rodrigues dos; Guimarães, Paulo Tácito Gontijo; Ajayi, Ayodele Ebenezer.
Título: Spatial variability of precompression stress and volumetric water content of a red-yellow latosol (Oxisol) / Variabilidade espacial da pressão de preconsolidação e da umidade volumétrica de um latossolo vermelho amarelo
Fonte: Biosci. j. (Online);36(1):142-151, jan./feb. 2020. ilus, tab.
Idioma: en.
Resumo: The intensive agricultural machinery traffic to which soils under coffee crops are exposed may cause significant changes in soil structure. The goals of this study were to: a) characterize the spatial variability of precompression stress (σp) and volumetric water content (θ) of a Red-Yellow Latosol (Oxisol) and determine their spatially dependent structures using ordinary kriging semivariograms; b) using this date to construct a load-bearing capacity (LBC) map for the site, identifying the depth with higher ; and c) use the map as a decision support tool regarding agricultural machinery logistic management in coffee plantations. The research was conducted on an experimental farm of the Agricultural Research Company of Minas Gerais (Epamig), Patrocinio, MG, on a clayey Oxisol. Samples were collected from 2.0 × 1.5 m sampling pits at intersections of a rectangular 40 × 150 m grid, totaling 28 sampling points. The soil samples were collected with metal rings (0.0254 m in height and 0.0630 m in diameter) using an Uhland sampler. Sampling at each pit was at 3 layers: 0.00­0.03 m, 0.10­0.13 m, and 0.25­0.28 m, and seven samples arranged in a matrix form were collected at each layer, totaling 588 samples. The σp and θ showed a spatially dependent structure. The depth of 0.00­0.03 m showed higher LBC, indicating that this depth was more compacted compared to other depths. Based on the σp maps, the tractor and the combine should not traffic into the areas at water content of 0.45 m3 m-3, because the soil has a LBC of 200 kPa. If this condition is not respected, additional compaction will occur. Tractor traffic is permissible when the water content reaches values less than 0.36 m3 m-3, whereas for combine traffic, the water content values must be less than 0.30 m3 m-3.

O tráfego intenso de máquinas agrícolas sobre solos cultivados com cafeeiro pode causar alterações significativas na estrutura do solo. Os objetivos deste estudo foram: a) avaliar e identificar a variabilidade espacial da pressão de preconsolidação (σp) e a umidade volumétrica (θ) de um Latossolo Vermelho-Amarelo (LVA) e determinar a estrutura de dependência espacial através de semivariogramas utilizando a krigagem ordinária; b) verificar no mapa, a profundidade com maior capacidade de suporte de carga (CSC) do solo ; c) dar suporte a tomada de decisão no manejo do maquinário agrícola da cultura cafeeira e utilizar esses mapas para a logística de manejo de trafego de máquinas. O experimento foi conduzido num LVA textura muito argilosa na Fazenda da Epamig (Empresa de Pesquisa Agropecuária de Minas Gerais), em Patrocínio-MG. A amostragem foi realizada numa malha retangular (150 m x 40 m), onde foram coletadas amostras indeformadas em anéis metálicos de 0,0254 m de altura por 0,0630 m de diâmetro com auxílio do amostrador tipo Uhland em 28 trincheiras. Cada trincheira possui três degraus que correspondem às profundidades de (0.00-0.03; 0.10-0.13 e 0.25-0.28 m) e as dimensões dos degraus foram de 2,0 x 1,5 m, coletaram-se sete amostras (disposta em forma matricial) para cada degrau, totalizando 588 amostras. A σp e θ apresentaram estrutura de dependência espacial. A profundidade de 0.00-0.03m apresentou maior CSC indicando que esta profundidade está mais compactada em relação as demais profundidades. Com base nos mapas da σp, o trator e a colhedora não devem trafegar na área para umidade volumétrica igual a 0.45 m3 m-3, pois o solo possui CSC de 200 kPa. Se essa condição for desrespeitada, a compactação adicional poderá ocorrer. Para o tráfego do trator, deve-se esperar por um período, para que a θ atinja um valor menor que 0.36 m3 m-3, enquanto que para o tráfego da colhedora deve-se esperar a θ atingir valor menor que 0.30 m3 m-3.
Descritores: Solo
Compactação
Suporte de Carga
Café
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-828187
Autor: Cheng, Fei; Hou, Lin; Woeste, Keith; Shang, Zhengchun; Peng, Xiaobang; Zhao, Peng; Zhang, Shuoxin.
Título: Soil pretreatment and fast cell lysis for direct polymerase chain reaction from forest soils for terminal restriction fragment length polymorphism analysis of fungal communities
Fonte: Braz. j. microbiol;47(4):817-827, Oct.-Dec. 2016. tab, graf.
Idioma: en.
Projeto: Technical management system for increasing the capacity of carbon sink and water regulation of mountain forests in the Qinling Mountains; . Detecting, simulating and applying techniques for coupling of carbon, nitrogen and water in forest ecosystems.
Resumo: Abstract Humic substances in soil DNA samples can influence the assessment of microbial diversity and community composition. Using multiple steps during or after cell lysis adds expenses, is time-consuming, and causes DNA loss. A pretreatment of soil samples and a single step DNA extraction may improve experimental results. In order to optimize a protocol for obtaining high purity DNA from soil microbiota, five prewashing agents were compared in terms of their efficiency and effectiveness in removing soil contaminants. Residual contaminants were precipitated by adding 0.6 mL of 0.5 M CaCl2. Four cell lysis methods were applied to test their compatibility with the pretreatment (prewashing + Ca2+ flocculation) and to ultimately identify the optimal cell lysis method for analyzing fungal communities in forest soils. The results showed that pretreatment with TNP + Triton X-100 + skim milk (100 mM Tris, 100 mM Na4P2O7, 1% polyvinylpyrrolidone, 100 mM NaCl, 0.05% Triton X-100, 4% skim milk, pH 10.0) removed most soil humic contaminants. When the pretreatment was combined with Ca2+ flocculation, the purity of all soil DNA samples was further improved. DNA samples obtained by the fast glass bead-beating method (MethodFGB) had the highest purity. The resulting DNA was successfully used, without further purification steps, as a template for polymerase chain reaction targeting fungal internal transcribed spacer regions. The results obtained by terminal restriction fragment length polymorphism analysis indicated that the MethodFGB revealed greater fungal diversity and more distinctive community structure compared with the other methods tested. Our study provides a protocol for fungal cell lysis in soil, which is fast, convenient, and effective for analyzing fungal communities in forest soils.
Descritores: Microbiologia do Solo
Polimorfismo de Fragmento de Restrição
Florestas
Reação em Cadeia da Polimerase
Microbiota
Fungos/classificação
Fungos/genética
-Solo/química
Cloreto de Cálcio
DNA Bacteriano
DNA Fúngico
Fungos/isolamento & purificação
Responsável: BR1.1 - BIREME


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Id: biblio-1049184
Autor: Miguel, Divino Levi; Silva, Eliane Maria Ribeiro da; Silva, Cristiane Figueira da; Pereira, Marcos Gervasio; Leite, Luiz Fernando Carvalho.
Título: Soil microbiological properties and enzyme activity in agroforestry systems compared with monoculture, natural regeneration, and native Caatinga / Propriedades microbiológicas e atividade enzimática do solo sob sistemas agroflorestais comparado com monocultura, regeneração natural e caatinga nativa
Fonte: Biosci. j. (Online);36(1):1-16, jan./feb. 2020. tab, ilus.
Idioma: en.
Resumo: The objective of this study was to evaluate the influence of agroforestry systems of different ages (AFS1: one-year old; AFS5: five-years old) on the biological attributes of soil; the following systems were used for comparison: a slash-and-burn (SBF) farming area, Caatinga which has been undergoing regeneration for 6 years (CaR6), and native Caatinga (NCa) in Brazil. Enzyme activity, abundance and composition of arbuscular mycorrhizal fungi (AMF), and production of glomalin-related soil proteins (GRSP) were evaluated at soil depths of 0­0.05 m. AMF species composition in the AFS was more similar to that in the NCa than in the SBF and CaR6 systems. In the rainy season, sporulation was most abundant in the AFS-1, CaR6, and SBF systems, whereas GRSP concentrations were highest in the AFS5 during the dry season. Acid phosphatase and arylsulfatase enzyme activity was lower in the AFS1 soils than in the NCa and SBF soils (rainy period), and levels of ß-glucosidase and fluorescein diacetate hydrolysis in the AFS were equal to or higher than those in the NCa in the dry season but lower in the rainy season. AFS thus appear to promote the maintenance of soil biological quality, and may be more sustainable than SBF farming systems in the Brazilian Caatinga over the long term.

O objetivo do estudo foi avaliar a influência de sistemas agroflorestais (AFS1: um ano de idade; AFS5: cinco anos de idade), nos atributos biológicos do solo usando como referência, uma área de agricultura de corte e queima (SBF), Caatinga em regeneração há 6 anos (CaR6), e Caatinga nativa (NCa), in Brasil. A atividade enzimática, a abundância e composição dos fungos micorrízicos arbusculares (AMF), e a produção de proteína do solo relacionada à glomalina (GRSP) foram avaliados, na profundidade de 0-5 cm do solo. A composição das espécies de AMF nos AFS foi mais semelhante a observada na NCa, do que os sistemas SBF e CaR6. Na estação chuvosa, a esporulação foi mais abundante em AFS-1, CaR6 and SBF quando comparada as outras áreas, enquanto a GRSP apresentou maiores teores no AFS5 no período seco. AFS1 apresentou atividade da fosfatase ácida e arilsulfatase inferiores tanto a NCa quanto a SBF, no período chuvoso. No período seco, a atividade de ß-glicosidase e a hidrólise do diacetato de fluoresceína (FDA) na AFS foram iguais ou superiores a Nca, mas menor no período chuvoso. Verifica-se que os AFS são potenciais para a manutenção da qualidade biológica do solo, podendo, em longo prazo, serem mais sustentáveis que a SBF, em ambiente de Caatinga.
Descritores: Arilsulfatases
Solo
Fosfatase Ácida
Glicosídeo Hidrolases
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-1049149
Autor: Avila, Ígor Araujo Menezes de; Hurtado, Sandro Manuel Carmelino; Jezus, Gabriel Camargo de; Silva, Gustavo Costa; Rezende, Matheus Mendes.
Título: Soil attributes and weed seedbank spatial correlation / Correlação espacial entre atributos físicos e químicos do solo e o banco de sementes de plantas infestantes
Fonte: Biosci. j. (Online);35(6):1871-1877, nov./dec. 2019. tab, ilus.
Idioma: en.
Resumo: The crop yield potential is affected by the crop-weed competition and their control create a dependence on herbicide use who brings, as consequence, soil impacts. Knowing the weed's spatial distribution on the field is a feasible alternative for improving the crop yield. The goal of this paper is the identification of the spatial variability on physical and chemical attributes of soil as well as the weed's seedbank so that, when correlated, may find standards to help on field management. The experiment was conducted on Uberlandia Federal University premises at soybean no-till area. Using georeferenced soil samples, were analyzed the physical and chemical attributes as well as the weed's seedbank. The weed population on controlled environment was quantify, sorting out broadleaf and grassy weeds species. The obtained data were analyzed by descriptive statistic and geostatistics for a semivariogram modeling, interpolation by the kriging methodology and the spatial variability maps achievement. The average value, coefficient of variation (CV%), asymmetry, kurtosis coefficient and the significant linear correlations interfered on data spatial variability which we concluded by the spatial dependences on the attributes that had a linear correlation between them. The semivariograms presented varied range between 202 to 752 meters. Using the maps, verified two different regions for the broadleaf and grassy weeds seedbank. For both situations there was influence by the soil attributes on infestation level, which makes it possible to target the herbicide management reducing costs and the environmental impact. From the analyzed data we conclude that there is a spatial dependence for the physical and chemical soil attributes and their spatial distribution explains the weed seedbank spatial variability.

O potencial produtivo das culturas é afetado pela competição por plantas infestantes e o seu controle cria dependência no uso de herbicidas, com consequente impacto ao solo. Conhecer o comportamento espacial das espécies infestantes é alternativa viável no aumento do lucro das lavouras. O presente trabalho teve por objetivo identificar o comportamento espacial nos atributos físicos e químicos do solo e no banco de sementes de plantas infestantes, de maneira que, ao correlacioná-los possa-se encontrar padrões que auxiliem no manejo das áreas agrícolas. O estudo foi realizado em área pertencente à Universidade Federal de Uberlândia-MG em área cultivada com soja em plantio direto. A partir de amostragens georreferenciadas foi realizada avaliação química e física do solo e determinação do banco de sementes de plantas infestantes. Foi mensurado o número de plantas infestantes em ambiente controlado, separando as espécies germinadas em Folha Estreita e Folha Larga. Os dados foram avaliados pela estatística descritiva e geoestatística, para ajuste de semivariogramas, interpolação por krigagem e obtenção de mapas de distribuição espacial. Os valores de média, CV%, assimetria, curtose, e as correlações lineares significativas inferiram no comportamento espacial dos dados, comportamento verificado pela dependência espacial observada para os atributos com correlação linear significativa entre eles. Os semivariogramas apresentaram alcance variando entre 202 m e 752 m. A partir dos mapas verifica-se duas regiões distintas para o banco de plantas infestantes de folha estreita e larga. Para ambas situações houve contribuição dos atributos do solo nos níveis de infestação, o que possibilita o direcionamento no ajuste de doses herbicidas para redução de custos e impacto ambiental. A partir dos dados conclui-se que há comportamento espacial para atributos químicos e físicos de solo, e a sua distribuição espacial explica o comportamento espacial do banco de sementes de plantas infestantes.
Descritores: Solo
Plantas Daninhas
Banco de Sementes
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-1049201
Autor: Cunha, Marialdo Santana da; Ferreira Neto, Miguel; Portela, Jeane Cruz; Ernesto Sobrinho, Francisco; Silva, Jucirema Ferreira da; Dias, Nildo da Silva; Cunha, Jeska Thayse da Silva Fernandes da; Sá, Francisco Vanies da Silva.
Título: Ethnopedology in production units at Canto da Ilha de Cima, São Miguel do Gostoso-RN, Brazil / Etnopedologia em unidades de produção canto da ilha de cima, São Miguel do Gostoso, RN, Brasil
Fonte: Biosci. j. (Online);36(1):113-121, jan./feb. 2020. tab.
Idioma: en.
Resumo: Ethnopedological studies in family units tend to contribute to the academy with respect to the importance of knowledge exchange, allowing the understanding on the local reality of a community. The objective of this study was to conduct an ethnopedological study in production units at the Settlement Project Canto da Ilha de Cima ­ RN, Brazil, and to infer on their interrelationships of knowledge. Participatory workshops and transverse walks were carried out and soils were classified by means of Ethnopedology. The soils were classified using etic and emic approaches, respectively: Inceptisol - CAMBISSOLO HÁPLICO Carbonático típico (Terra Boa or Malhada de Boi) (P1); Oxisol - LATOSSOLO AMARELO Eutrófico típico(Terra de Arisco) (P2); Ultisol - ARGISSOLO VERMELHO AMARELO Eutrófico típico (Terra de Arisco Branco Amarelado) (P3); Oxisol - LATOSSOLO AMARELO Eutrófico típico (Terra de Piçarro) (P4); Ultisol - ARGISSOLO AMARELO Eutrófico abrúptico (Terra de Arisco) (P5) and Inceptisol - CAMBISSOLO HÁPLICO Tb Eutrófico típico (Terra Boa or Velha Chica) (P6 and P7). In the emic survey, farmers described as fertile and better for agricultural activities the soils in the following areas: "Terra Boa" or "Malhada do Boi" (P1) and "Velha Chica" or "Terra Boa" (P6 and P7), corroborating the etic classification, based on the parent material. The soils in these areas were classified as Inceptisols(CAMBISSOLOS), which have higher natural fertility.

Estudos etnopedológicos em unidade familiar tendem a contribuir com academia sobre a importância da troca de saberes, proporcionando a compreensão da realidade local de uma comunidade. Objetivou-se a realização de estudo etnopedológico no Projeto de Assentamento Canto da Ilha de Cima ­ RN, em unidades de produção e inferir sobre as suas inter-relações dos conhecimentos. Foram realizadas oficinas participativas e caminhadas transversais e a classificação dos solos por meio da Etnopedologia. Os solos foram classificados de forma eticista e emicista, respectivamente: CAMBISSOLO HÁPLICO Carbonático típico ­ Inceptisol (Terra Boa Malhada de Boi) (P1); LATOSSOLO AMARELO Eutrófico típico ­ Oxisol (Terra de Arisco) (P2); ARGISSOLO VERMELHO AMARELO Eutrófico típico ­ Ultisol (Terra de Arisco Branco Amarelado) (P3); LATOSSOLO AMARELO Eutrófico típico ­ Oxisol (Terra de Piçarro) (P4); ARGISSOLO AMARELO Eutrófico abrúptico ­ Ultisol (Terra de Arisco) (P5) and CAMBISSOLO HÁPLICO Tb Eutrófico típico ­ Inceptisol (Terra Boa Velha Chica) (P6 and P7). Os agricultores denominaram no levantamento emicista como terras férteis e melhores para o desempenho das atividades agrícolas, nas seguintes áreas: Terra Boa ou Malhada do Boi (P1) e as áreas denominadas de Velha Chica ou Terra Boa (P6 e P7), corroborando com a classificação eticista, em função do material de origem, sendo classificadas como CAMBISSOLOS, com maior fertilidade natural.
Descritores: Solo
Zona Semiárida
Responsável: BR396.1 - Biblioteca Central


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Id: biblio-828206
Autor: Lopes Leal, Patrícia; Varón-López, Maryeimy; Gonçalves de Oliveira Prado, Isabelle; Valentim dos Santos, Jessé; Fonsêca Sousa Soares, Cláudio Roberto; Siqueira, José Oswaldo; de Souza Moreira, Fatima Maria.
Título: Enrichment of arbuscular mycorrhizal fungi in a contaminated soil after rehabilitation
Fonte: Braz. j. microbiol;47(4):853-862, Oct.-Dec. 2016. tab, graf.
Idioma: en.
Resumo: Abstract Spore counts, species composition and richness of arbuscular mycorrhizal fungi, and soil glomalin contents were evaluated in a soil contaminated with Zn, Cu, Cd and Pb after rehabilitation by partial replacement of the contaminated soil with non-contaminated soil, and by Eucalyptus camaldulensis planting with and without Brachiaria decumbens sowing. These rehabilitation procedures were compared with soils from contaminated non-rehabilitated area and non-contaminated adjacent soils. Arbuscular mycorrhizal fungi communities attributes were assessed by direct field sampling, trap culture technique, and by glomalin contents estimate. Arbuscular mycorrhizal fungi was markedly favored by rehabilitation, and a total of 15 arbuscular mycorrhizal fungi morphotypes were detected in the studied area. Species from the Glomus and Acaulospora genera were the most common mycorrhizal fungi. Number of spores was increased by as much as 300-fold, and species richness almost doubled in areas rehabilitated by planting Eucalyptus in rows and sowing B. decumbens in inter-rows. Contents of heavy metals in the soil were negatively correlated with both species richness and glomalin contents. Introduction of B. decumbens together with Eucalyptus causes enrichment of arbuscular mycorrhizal fungi species and a more balanced community of arbuscular mycorrhizal fungi spores in contaminated soil.
Descritores: Solo/química
Microbiologia do Solo
Brasil
Micorrizas/classificação
Poluição Ambiental
-Poluentes do Solo/química
Esporos Fúngicos
Proteínas Fúngicas
Contagem de Colônia Microbiana
Metais Pesados/química
Responsável: BR1.1 - BIREME


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Id: lil-788972
Autor: Shuai, Jianjun; Yu, Xurun; Zhang, Jing; Xiong, Ai-sheng; Xiong, Fei.
Título: Regional analysis of potential polychlorinated biphenyl degrading bacterial strains from China
Fonte: Braz. j. microbiol;47(3):536-541, July-Sept. 2016. tab, graf.
Idioma: en.
Resumo: ABSTRACT Polychlorinated biphenyls (PCBs), the chlorinated derivatives of biphenyl, are one of the most prevalent, highly toxic and persistent groups of contaminants in the environment. The objective of this study was to investigate the biodegradation of PCBs in northeastern (Heilongjiang Province), northern (Shanxi Province) and eastern China (Shanghai municipality). From these areas, nine soil samples were screened for PCB-degrading bacteria using a functional complementarity method. The genomic 16S rDNA locus was amplified and the products were sequenced to identify the bacterial genera. Seven Pseudomonas strains were selected to compare the capacity of bacteria from different regions to degrade biphenyl by HPLC. Compared to the biphenyl content in controls of 100%, the biphenyl content went down to 3.7% for strain P9-324, 36.3% for P2-11, and 20.0% for the other five strains. These results indicate that a longer processing time led to more degradation of biphenyl. PCB-degrading bacterial strains are distributed differently in different regions of China.
Descritores: Bactérias/classificação
Bactérias/metabolismo
Bifenilos Policlorados/metabolismo
Poluentes Ambientais/metabolismo
-Filogenia
Solo/química
Microbiologia do Solo
Biodegradação Ambiental
RNA Ribossômico 16S/genética
China
Responsável: BR1.1 - BIREME



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