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| Registros recuperados: 54 | |
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| CHALITA,Patrícia Bombonati; FARIAS,Eliane do Nascimento Cunha; COSTA,Ismaele Breckenfeld da; SOUSA,Brenda Ferreira; SANTOS,Marco Antônio Oliveira dos; ALBUQUERQUE,Teresinha Costa Silveira de; VITAL,Marcos José Salgado; SILVA,Krisle da. |
| ABSTRACT Brazil nut is a very important nontimber forest product in the Amazon region. Propagation of this tree still represents a challenge due to slow and uneven seed germination. In this context, plant growth-promoting bacteria can facilitate the process of propagation. The aims of this study were to isolate and characterize endophytic bacteria from the roots of Brazil nut trees in native terra firme forest and cultivation areas in northern Brazil, and to identify mechanisms by which bacteria act in plant growth promotion. Overall, 90 bacterial isolates were obtained from the roots of Brazil nut trees in monoculture, agroforestry and native forest areas by using different semisolid media. The isolates were characterized by sequencing the 16S rRNA gene.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 16S rRNA; Phosphate solubilization; Indole compounds; Biological nitrogen fixation; Plant growth-promotion bacteria; Amazon. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672019000400257 |
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| SILVA,Krisle da; PERIN,Liamara; GOMES,Maria de Lourdes; BARAÚNA,Alexandre Cardoso; PEREIRA,Gilmara Maria Duarte; MOSQUEIRA,Cátia Aparecida; COSTA,Ismaele Breckenfeld da; O'HARA,Graham; ZILLI,Jerri Édson. |
| ABSTRACT Maize plants can establish beneficial associations with plant growth-promoting bacteria. However, few studies have been conducted on the characterization and inoculation of these bacteria in the Amazon region. This study aimed to characterize endophytic bacteria isolated from maize in the Amazon region and to assess their capacity to promote plant growth. Fifty-five bacterial isolates were obtained from maize grown in two types of ecosystems, i.e., a cerrado (savanna) and a forest area. The isolates were characterized by the presence of the nifH gene, their ability to synthesize indole-3-acetic acid (IAA) and solubilize calcium phosphate (CaHPO4), and 16S rRNA partial gene sequencing. Twenty-four bacteria contained the nifH gene, of which seven... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biological nitrogen fixation; Zea mays L.; 16S rRNA. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672016000200111 |
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| SOUZA ROCHA,Katarine de; SCHUPP DE SENA MESQUITA,Gleiciane; SILVA FERREIRA,Maeli Fernanda; LEITE BARROS,Flávia de Nazaré; MACEDO,Renata Cecília Soares de Lima; ARAÚJO SARAIVA,Elane de; MENDES-OLIVEIRA,Ana Cristina; DUARTE CERQUEIRA,Valíria; SCOFIELD,Alessandra; GOES CAVALCANTE,Gustavo; ABEL,Isis; GUIMARÃES DE MORAES,Carla Cristina. |
| ABSTRACT We analyzed the presence of Leptospira spp. in liver and kidney tissue of wild marsupials and rodents trapped in a periurban forest in the eastern Brazilian Amazon. We examined 25 individuals of four marsupial and seven rodent species for the presence of the 16S rRNA gene of Leptospira in the DNA extracted from 47 liver and kidney tissue samples using PCR. We detected positive samples in 12% (3/25) of the individuals, in kidney fragments of two marsupial species (Didelphis marsupialis and Marmosops pinheiroi) and in a liver fragment of one rodent species (Echimys chrysurus). These are the first records of Leptospira spp. in M. pinheiroi and E. chrysurus and it is the first molecular survey of marsupials and rodents in the Brazilian Amazon. |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Didelphimorphia; Rodentia; Live traps; Kidney; Liver; 16S rRNA. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672020000400305 |
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| LANDRIEL,SOLEDAD CAMINATA; CASTILLO,JULIETA D.L.M.; TABOGA,OSCAR A.; FERRAROTTI,SUSANA A.; GOTTLIEB,ALEXANDRA M.; COSTA,HERNÁN. |
| Abstract: Cyclodextrin glycosyltransferases (CGTases) are important enzymes in the biotechnology field because they catalyze starch conversion into cyclodextrins and linear oligosaccharides, which are used in food, pharmaceutical and cosmetic industries. The CGTases are classified according to their product specificity in α-, β-, α/β- and γ-CGTases. As molecular markers are the preferred tool for bacterial identification, we employed six molecular markers (16S rRNA, dnaK, gyrB, recA, rpoB and tufA) to test the identification of a CGTase-producing bacterial strain (DF 9R) in a phylogenetic context. In addition, we assessed the phylogenetic relationship of CGTases along bacterial evolution. The results obtained here allowed us to identify the strain DF 9R as... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyclodextrin glycosyltransferases; Housekeeping genes; Paenibacillus; 16S rRNA. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652019000500620 |
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| Radulović,.; Milutinović,M.; Tomanović,S.; Mulenga,A.. |
| A reverse transcriptase - polymerase chain reaction based assay for Borrelia species detection in ticks was developed. The method was based on amplification of 552 nucleotide bases long sequence of 16S rRNA, targeted by Borrelia specific primers. In the present study, total RNA extracted from Ixodes ricinus ticks was used as template. The results showed higher sensitivity for Borrelia detection as compared to standard dark-field microscopy. Method specificity was confirmed by cloning and sequencing of obtained 552 base pairs long amplicons. Phylogenetic analysis of obtained sequences showed that they belong to B. lusitaniae and B. afzelii genospecies. RT-PCR based method presented in this paper could be very useful as a screening test for detecting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Borrelia; RT-PCR; 16S rRNA; Ixodes ricinus. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352010000400015 |
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| WILHELM,VIVIAN; VILLEGAS,JAIME; MIQUEL,ÁLVARO; ENGEL,ESTEBAN; BERNALES,SEBASTIÁN; VALENZUELA,PABLO D.T.; BURZIO,LUIS O.. |
| The complete sequence of the mitochondrial genome of Chinook salmon, Oncorhynchus tshawytscha, has been determined. The circular genome consisting of 16,644 base pairs encodes thirteen proteins, the 12S and 16S ribosomal RNAs, and 22 transfer RNAs. These genes are ordered in the same way as most other vertebrates. The nucleotide and amino acid sequences of the ribosomal RNAs and the thirteen protein-coding genes were compared with those of other salmonids such as Oncorhynchus mykiss, Salmo salar, Salvelinus fontinalis, Salvelinus alpinus and Coregonus lavaretus. The sequence features of the control region (D-loop), the origin of L-strand replication and a putative peptide codified by the 16S mitochondrial RNA are described and discussed. |
| Tipo: Journal article |
Palavras-chave: Salmonids; Mitochondria; Genome; Peptides; 16S rRNA. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602003000200012 |
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| Santana,Raiana S. M.; Fernandes,G. W.; Ávila,Marcelo P.; Reis,Mariana P.; Araújo,Flávio M. G. de; Salim,Anna C. M.; Oliveira,Guilherme; Chartone-Souza,Edmar; Nascimento,Andréa M. A.. |
| ABSTRACT Although endophytic bacteria impact the health, and ultimately the fitness, of their hosts, our understanding of the diversity of endophytic species remains limited. Here we report on the endophytic microbiota inhabiting the roots, healthy leaves and leaves attacked by a gall-inducing insect of Baccharis dracunculifolia, a species of major economic relevance in South America, using 16S rRNA gene new generation sequencing. Rhodoplanes and Nitrospira were well represented in the communities of roots and leaves; known to be important for nitrogen cycling. The difference in bacterial diversity between healthy and galled leaves was not pronounced. The leaves seem to harbor specialized bacteria with high tolerances to abiotic stresses such as wide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Baccharis dracunculifolia; Endophytic bacteria; 16S rRNA. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100433 |
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| Ribeiro,Catherine Gérikas; Steffens,Maria Berenice Reynaud; Etto,Rafael Mazer; Galvão,Carolina Weigert; Martins,César de Castro; Pedrosa,Fábio de Oliveira; Kolm,Hedda Elisabeth. |
| The mangrove's sediments from the coastal areas under human activities may contain significant contaminations by hydrocarbons, even when there are no visual evidences of it. The microorganisms are essential to these ecosystems, especially in the control of their chemical environment. Sediment samples were collected in two regions under different environment conditions (pristine and contaminated) of the Paranaguá Estuarine Complex (Paranaguá Bay and Laranjeiras Bay), Brazil. Aliphatic hydrocarbons were determined by the GC-FID to assess the status of contamination of the studied areas. The total DNA was extracted from these samples. The 16S rRNA gene was amplified by the PCR reactions with the pair of primers 21F and 958R for the archaeal domain, and 27F... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diversity; Mangroves; Archaea; Bacteria; 16S rRNA; ARDRA; Aliphatic hydrocarbons. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000200013 |
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| Tawong,Wittaya. |
| ABSTRACT The genus Planktothricoides Suda & Watanabe is considered as a 2-methylisoborneol (MIB) producer, affecting water quality and aquatic animal products worldwide. To date, there is limited information about the diversity of this genus from Thailand. In this study, Thai Planktothricoides strains were isolated from fish ponds and reservoirs in North, Northeast and Central regions for morphological examination, phylogenetic analyses based on 16S rRNA, rbcLX and MIB synthase genes as well as GC/MS/MS analyses. The morphological results and the 16S rRNA and rbcLX phylogenies of Thai Planktothricodes strains enabled them to be designated as Planktothricoides raciborskii. Cell dimensions of Thai strains tested were in 1.86 to 5.96 µm length (L), 2.83... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 2-methylisoborneol; Filamentous cyanobacteria; 16S rRNA; MIB synthase; Thailand. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100433 |
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| Pisa,G.; Magnani,G.S.; Weber,H.; Souza,E.M.; Faoro,H.; Monteiro,R.A.; Daros,E.; Baura,V.; Bespalhok,J.P.; Pedrosa,F.O.; Cruz,L.M.. |
| Sugarcane is an important agricultural product of Brazil, with a total production of more than 500 million tons. Knowledge of the bacterial community associated with agricultural crops and the soil status is a decisive step towards understanding how microorganisms influence crop productivity. However, most studies aim to isolate endophytic or rhizosphere bacteria associated with the plant by culture-dependent approaches. Culture-independent approaches allow a more comprehensive view of entire bacterial communities in the environment. In the present study, we have used this approach to assess the bacterial community in the rhizosphere soil of sugarcane at different times and under different nitrogen fertilization conditions. At the high taxonomic level, few... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 16S rRNA; Biodiversity; Nitrogen fixation; Bacteria; Sugarcane; Soil. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011001200004 |
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| El-Naggar,Noura El-Ahmady; Abdelwahed,Nayera A.M.; Saber,Wesam I.A.; Mohamed,Asem A.. |
| The use of low cost agro-industrial residues for the production of industrial enzymes is one of the ways to reduce significantly production costs. Cellulase producing actinomycetes were isolated from soil and decayed agricultural wastes. Among them, a potential culture, strain NEAE-J, was selected and identified on the basis of morphological, cultural, physiological and chemotaxonomic properties, together with 16S rDNA sequence. It is proposed that strain NEAE-J should be included in the species Streptomyces albogriseolus as a representative of a novel sub-species, Streptomyces albogriseolus subsp. cellulolyticus strain NEAE-J and sequencing product was deposited in the GenBank database under accession number JN229412. This organism was tested for its... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agro-industrial residues; Endoglucanase production; Streptomyces albogriseolus; 16S rRNA; Scanning electron microscope. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822014000200050 |
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| Huang,Haibin; Unver,Ahmet; Perez,Miriam J.; Orellana,Nelson G.; Rikihisa,Yasuko. |
| Blood specimens from clinically normal military dogs and their trainers, in Lara, Venezuela were screened for Anaplasma platys, A. phagocytophilum, or Ehrlichia ewingii using 16S rRNA PCR tests. Sixteen percent (7/43) of dog specimens were positive by A. platys PCR test followed by sequencing of the PCR products, and all human blood specimens [25] were negative. All specimens from these dogs and humans were PCR negative for E. ewingii or A. phagocytophilum. Twelve Rhipicephalus sanguineus ticks removed from these dogs were negative for A. platys by reverse transcription PCR test. Almost the entire 16S rRNA gene (1,364 bp) and groESL operon (1,646 bp) sequences of A. platys isolated from a dog were determined, revealing that both sequences were closely... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 16S rRNA; GroESL operon; Anaplasma platys; Dogs; Venezuela. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000300002 |
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| De La Torre-Ruiz,Neyser; Ruiz-Valdiviezo,Víctor Manuel; Rincón-Molina,Clara Ivette; Rodríguez-Mendiola,Martha; Arias-Castro,Carlos; Gutiérrez-Miceli,Federico Antonio; Palomeque-Dominguez,Héctor; Rincón-Rosales,Reiner. |
| ABSTRACT The effect of plant growth-promoting bacteria inoculation on plant growth and the sugar content in Agave americana was assessed. The bacterial strains ACO-34A, ACO-40, and ACO-140, isolated from the A. americana rhizosphere, were selected for this study to evaluate their phenotypic and genotypic characteristics. The three bacterial strains were evaluated via plant inoculation assays, and Azospirillum brasilense Cd served as a control strain. Phylogenetic analysis based on the 16S rRNA gene showed that strains ACO-34A, ACO-40 and ACO-140 were Rhizobium daejeonense, Acinetobacter calcoaceticus and Pseudomonas mosselii, respectively. All of the strains were able to synthesize indole-3-acetic acid (IAA), solubilize phosphate, and had nitrogenase... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agave; Inoculation; Bacteria; Inulin; 16S rRNA. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300587 |
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| Pillai,Aneesh Balakrishna; Kumar,Arjun Jaya; Thulasi,Kavitha; Kumarapillai,Harikrishnan. |
| Abstract This study was focused on the polyhydroxybutyrate (PHB) accumulation property of Bacillus aryabhattai isolated from environment. Twenty-four polyhydroxyalkanoate (PHA) producers were screened out from sixty-two environmental bacterial isolates based on Sudan Black B colony staining. Based on their PHA accumulation property, six promising isolates were further screened out. The most productive isolate PHB10 was identified as B. aryabhattai PHB10. The polymer production maxima were 3.264 g/L, 2.181 g/L, 1.47 g/L, 1.742 g/L and 1.786 g/L in glucose, fructose, maltose, starch and glycerol respectively. The bacterial culture reached its stationary and declining phases at 18 h and 21 h respectively and indicated growth-associated PHB production. Nuclear... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacillus aryabhattai PHB10; Polyhydroxybutyrate; Domestic sewerage; Polymer characterization; 16S rRNA. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300451 |
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| Registros recuperados: 54 | |
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