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| Registros recuperados: 414 | |
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| Reche,Maria Helena Lima Ribeiro; Fiuza,Lídia Mariana. |
| Bacteria are the most diverse living beings on earth and only a fraction of them have been identified. This paper aims at the analysis of the diversity of mesophilic and heterotrophic bacteria found in samples of irrigation water from rice-fields areas in Rio Grande do Sul State, Brazil. Sample collection was carried out in five rice crop regions areas and followed by isolation, multiplication and bacterial characterization. The species' identification was based on biochemical tests (API-System, bioMérieux). Bacterial diversity was determined by the Shannon & Weaner and Pielou index. The results regarding bacterial diversity revealed 26 species. The most abundant representatives belonged to the Bacillus, Corynebacterium, Staphylococcus and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Diversity; Water; Rice-field. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300009 |
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| Su,Yuan-Ying; Sun,Xin; Guo,Liang-Dong. |
| The seasonal change and host preference of arbuscular mycorrhizal (AM) colonization and community composition of five common plant species Agropyron cristatum, Anemarrhena asphodeloides, Cleistogenes squarrosa, Leymus chinensis, and Stipa grandis in the Inner Mongolia steppe were investigated. The AM root length colonization rates were different among the five plant species and were generally high in early (May and June) and late (September) growth seasons and low in August. A total of 18 AM fungal species representing five genera were isolated from rhizosphere soils of the five plant species, and most AM fungi had not host specificity, except that Acaulospora sp., Glomus constrictum, G. diaphanum and Glomus sp. showed a certain degree of host preference.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Seasonal dynamics; Arbuscular mycorrhizal fungi; Diversity; Grassland. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100008 |
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| Schoenlein-Crusius,Iracema Helena; Milanez,Adauto I.; Trufem,Sandra F.B.; Pires-Zottarelli,Carmen L.A.; Grandi,Rosely A. Piccolo; Santos,Maria L.; Giustra,Kátia C.. |
| This article presents a survey of fungi obtained from soil, water and mixed leaf litter samples taken from the Atlantic Rainforest in the municipality of Cubatão, in the State of São Paulo, during the years of 1993 to 1995. Using different techniques for the isolation of microscopic fungi, a total of 280 taxa was obtained (66 zoosporic fungi, 40 Mucorales, 45 Glomales, 125 anamorphs, three Ascomycota and one Basidiomycota), with 23 species being reported for the first time in Brazil. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fungi; Diversity; Atlantic Rainforest; Brazil. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822006000300014 |
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| Aanniz,Tarik; Ouadghiri,Mouna; Melloul,Marouane; Swings,Jean; Elfahime,Elmostafa; Ibijbijen,Jamal; Ismaili,Mohamed; Amar,Mohamed. |
| The diversity of thermophilic bacteria was investigated in four hot springs, three salt marshes and 12 desert sites in Morocco. Two hundred and forty (240) thermophilic bacteria were recovered, identified and characterized. All isolates were Gram positive, rod-shaped, spore forming and halotolerant. Based on BOXA1R-PCR and 16S rRNA gene sequencing, the recovered isolates were dominated by the genus Bacillus (97.5%) represented by B. licheniformis (119), B. aerius (44), B. sonorensis (33), B. subtilis (subsp. spizizenii (2) and subsp. inaquosurum (6)), B. amyloliquefaciens (subsp. amyloliquefaciens (4) and subsp. plantarum (4)), B. tequilensis (3), B. pumilus (3) and Bacillus sp. (19). Only six isolates (2.5%) belonged to the genus Aeribacillus represented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermophilic bacteria; Hot springs; Diversity; 16S rRNA gene sequencing; Hydrolytic enzymes. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000200443 |
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| Braga,Raíssa Mesquita; Dourado,Manuella Nóbrega; Araújo,Welington Luiz. |
| ABSTRACT The microorganism-microorganism or microorganism-host interactions are the key strategy to colonize and establish in a variety of different environments. These interactions involve all ecological aspects, including physiochemical changes, metabolite exchange, metabolite conversion, signaling, chemotaxis and genetic exchange resulting in genotype selection. In addition, the establishment in the environment depends on the species diversity, since high functional redundancy in the microbial community increases the competitive ability of the community, decreasing the possibility of an invader to establish in this environment. Therefore, these associations are the result of a co-evolution process that leads to the adaptation and specialization,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microbial interaction; Diversity; Microbe-host interaction; Molecular interaction. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000500086 |
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| Qiu,Shanlian; Chen,Guoyuan; Zhou,Yiyong. |
| The measures of most-probable-number and restriction fragment length polymorphism analysis were used to analyze the abundance and diversity of ammonia-oxidizing bacteria in sediment of a Chinese shallow eutrophic urban lake (Lake Yuehu). Among the 5 sampling sites, ammonia concentration in interstitial water was positively proportional not only to the content of organic matter, but also to ammonia-oxidizing bacteria numbers (at a magnitude of 10(5) cells g-1 dry weight) in sediment significantly. Furthermore, the diversity of ammonia-oxidizing bacteria were determined by means of PCR primers targeting the amoA gene with five gene libraries created and restriction pattern analysis. The 13 restriction patterns were recorded with 4 ones being common among all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ammonia-oxidizing bacteria; Abundance; AmoA; Diversity. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100031 |
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| Qiu,Shanlian; Wang,MK; Wang,Fei; Chen,Jichen; Li,Xiaoyan; Li,Qinghua; Lin,Cheng; Lin,Xinjian. |
| A field experiment established in 1980 was conducted to evaluate the effects of open drainage ditch applied for water removal on bacterial and fungal communities of cold waterlogged paddy soils in 2011. In this experiment, traditional plate counting and temperature gradient gel electrophoresis were employed to characterize the abundance and diversity of soil bacterial and fungal communities. Four different distances from the open drainage ditch, 5, 15, 25 and 75 m with different degrees of drainage were designed for this study. Maximum populations of culturable aerobic bacteria and fungi were at 15-m distance while minimum populations were at 75-m distance. Significant differences (p < 0.05) in fungal populations were observed at all distances from open... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Bacterial and fungal communities; Diversity; Open drainage ditch. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000300050 |
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| Rodrigues,Dalila Ribeiro; Silva,Aleksandro Ferreira da; Cavalcanti,Maria Idaline Pessoa; Escobar,Indra Elena Costa; Fraiz,Ana Carla Resende; Ribeiro,Paula Rose de Almeida; Ferreira Neto,Reginaldo Alves; Freitas,Ana Dolores Santiago de; Fernandes-Júnior,Paulo Ivan. |
| Abstract Erythrina velutina ("mulungu") is a legume tree from Caatinga that associates with rhizobia but the diversity and symbiotic ability of "mulungu" rhizobia are poorly understood. The aim of this study was to characterize "mulungu" rhizobia from Caatinga. Bacteria were obteined from Serra Talhada and Caruaru in Caatinga under natural regeneration. The bacteria were evaluated to the amplification of nifH and nodC and to metabolic characteristics. Ten selected bacteria identified by 16S rRNA sequences. They were tested in vitro to NaCl and temperature tolerance, auxin production and calcium phosphate solubilization. The symbiotic ability were assessed in an greenhouse experiment. A total of 32 bacteria were obtained and 17 amplified both symbiotic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological nitrogen fixation; "Mulungu"; Diversity; Inoculant; 16S rRNA. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300503 |
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| de la Barra,Rodrigo; Uribe,Héctor; Latorre,Etel; San Primitivo,Fermín; Arranz,Juan. |
| Chilean sheep breeds have a significant founder effect since they descend from very few parents, in some cases population inbreeding has increased and in others there have been significant differentiation processes as compared to their original population. The objective of this study was to estimate the current status of genetic diversity in sheep herds, which comprise the main sheep breeds in Chile, using molecular methods. Animals from four breeding herds were sampled and analyzed. The breeds studied were Corriedale, Suffolk Down, Romney Marsh and Chilota, these are the predominant numerical pure breeds in Chile. From each breed population 40 animals were sampled. Genetic characterization was done using nine microsatellite molecular markers (SSR)... |
| Tipo: Journal article |
Palavras-chave: Microsatellite; Diversity; Sheep; Chile. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000400016 |
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| Castro,Ana Paula Gomes de; Faleiro,Fábio Gelape; Carvalho,Daniel Diego Costa; Fonseca,Kenia Gracielle da; Vilela,Marina de Fátima; Junqueira,Nilton Tadeu Vilela; Cares,Juvenil Enrique. |
| This study aimed to characterize the genetic variability in commercial accessions of passion fruit from the Federal District, Brazil, by RAPD markers. Genetic analyses were done with leaf samples of 30 accessions. DNA samples were amplified by RAPD technique, and respective markers converted into a binary matrix, from which the genetic distances between the accessions were estimated. Clustering analyis based on genetic distances allowed to detect a wide range of genetic variabillity among the accessions of sour passion fruit, and to separate them from the two sweet passion fruit. The graphical positioning of 'BRS Ouro Vermelho' confirms its potential to improve the genetic variability of commercial varieties of sour passion fruit. Dispersal of genetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Passion fruit; Plant breeding; RAPD analysis. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000600013 |
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| Registros recuperados: 414 | |
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