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Fotocópia
Id: biblio-1171793
Autor: Barrera Viviana A; Kageyama Koji; Rojo Rodrigo A; Gasoni Laura; Kobayashi Kiroku.
Título: A species-specific method for detecting pathogenic Streptomyces species from soil and potato tubers in Argentina / A species-specific method for detecting pathogenic Streptomyces species from soil and potato tubers in Argentina.
Fonte: Rev. argent. microbiol;45(4):277-81, dic. 2013.
Idioma: es.
Resumo: Potato common scab is caused by several soil-inhabiting pathogenic Streptomyces species. In the present study, a species-specific PCR method was used to detect Streptomyces species in potato tuber lesions and soils. Total genomic DNA from soil samples from six locations and tuber samples from four potato cultivars (Spunta, Shepody, Innovator and Russet Burbank) were assessed. Streptomyces scabies, Streptomyces acidiscabies, and Streptomyces turgidiscabies were detected in soybean, tobacco and potato soils and in all potato varieties except Russet Burbank. The phylogenetic analysis of the sequences obtained confirmed the identification. The method proposed proved to be time-saving and cost effective for the rapid detection of Streptomyces species. This is the first report of the detection of S. acidiscabies and S. turgidiscabies in soils and potato tubers from Argentina.
Descritores: Doenças das Plantas/microbiologia
Microbiologia do Solo
Solanum tuberosum/microbiologia
Streptomyces/isolamento & purificação
-Argentina
Especificidade da Espécie
Técnicas Bacteriológicas/métodos
Tipo de Publ: Artigo de Revista
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Responsável: AR5.1 - Centro de Gestión del Conocimiento y las Comunicaciónes


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Id: biblio-1171769
Autor: Busquets Natalia P; Baroni María R; Ochoteco María C; Zurbriggen María L; Virgolini Stella; Meneghetti Fernando G.
Título: Aislamientos bacterianos de muestras respiratorias de pacientes pediátricos con fibrosis quística y su distribución por edades / [Bacterial isolates from respiratory samples of pediatric patients with cystic fibrosis and their distribution by ages].
Fonte: Rev. argent. microbiol;45(1):44-9, mar. 2013.
Idioma: es.
Resumo: The bacterial isolates from respiratory samples of 50 pediatric patients with cystic fibrosis, their distribution by ages and antimicrobial resistance pattern as well as the intermittence of isolations and coinfections, were investigated. Staphylococcus aureus was isolated in 72

of patients, followed by Pseudomonas aeruginosa (58

), and the Burkholderia cepacia complex (12

). The frequency of resistance of P. aeruginosa isolates to ß-lactam antibiotics was low (13.8

). Fifty percent of S. aureus isolates was methicillin-resistant, and 57.1

of H. influenza was ampicillin resistant due to ß-lactamase production. In children under 4 years-old, S. aureus was predominant, followed by P. aeruginosa and H. influenzae. This order of predominance was observed in all the groups studied, except in that of children between 10 and 14 years-old. Stenotrophomonas maltophilia and Achromobacter xylosoxidans isolates were intermittent and accompanied by other microorganisms. Finally, we observed a great variety of bacterial species, which imposes stringent performance requirements for microbiological studies in all respiratory samples of these patients.
Descritores: Bactérias Gram-Negativas/isolamento & purificação
Fibrose Cística/complicações
Infecções Respiratórias/microbiologia
Sistema Respiratório/microbiologia
Staphylococcus aureus/isolamento & purificação
-Adolescente
Bactérias Gram-Negativas/efeitos dos fármacos
Coinfecção/epidemiologia
Coinfecção/microbiologia
Criança
Escarro/microbiologia
Especificidade da Espécie
Estudos Retrospectivos
Faringe/microbiologia
Farmacorresistência Bacteriana Múltipla
Fatores Etários
Feminino
Fibrose Cística/microbiologia
Humanos
Infecções Estafilocócicas/epidemiologia
Infecções Estafilocócicas/etiologia
Infecções Estafilocócicas/microbiologia
Infecções Respiratórias/epidemiologia
Infecções Respiratórias/etiologia
Infecções por Bactérias Gram-Negativas/epidemiologia
Infecções por Bactérias Gram-Negativas/etiologia
Infecções por Bactérias Gram-Negativas/microbiologia
Lactente
Masculino
Nasofaringe/microbiologia
Pré-Escolar
Tipo de Publ: Resumo em Inglês
Artigo de Revista
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Responsável: AR5.1 - Centro de Gestión del Conocimiento y las Comunicaciónes


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Id: biblio-1171766
Autor: de Oliveira Kelly M P; dos S Júlio Péricles D; Grisolia Alexéia B.
Título: Antimicrobial susceptibility profile of Pseudomonas spp. isolated from a swine slaughterhouse in Dourados, Mato Grosso do Sul State, Brazil / Antimicrobial susceptibility profile of Pseudomonas spp. isolated from a swine slaughterhouse in Dourados, Mato Grosso do Sul State, Brazil.
Fonte: Rev. argent. microbiol;45(1):57-60, mar. 2013.
Idioma: es.
Resumo: The present work sought to detect the presence of Pseudomonas spp. at different stages of an effluent treatment plant using the Australian system of stabilization ponds, and to determine the susceptibility of those isolates to different antimicrobials. Thirty-four isolates of Pseudomonas spp. derived from effluent treatment station water samples were collected near the transfer ducts between the ponds in November/2008 and december/2009. Among the Pseudomonas spp. isolates, 47.05

showed susceptibility to all antimicrobials tested, 20.58

were resistant to cefepime, and 24

showed intermediate resistance to streptomycin. No Pseudomonas spp. isolates were found in the final pond, or in post-treatment effluents. The Pseudomonas spp. isolates did not exhibit multiresistance to the antimicrobials tested.
Descritores: Matadouros
Pseudomonas/efeitos dos fármacos
Resistência Microbiana a Medicamentos
Sus scrofa/microbiologia
-Animais
Antibacterianos/farmacologia
Brasil
Eliminação de Resíduos Líquidos/métodos
Eliminação de Resíduos de Serviços de Saúde/métodos
Especificidade da Espécie
Estudos Retrospectivos
Microbiologia da Água
Pseudomonas/classificação
Pseudomonas/isolamento & purificação
Resíduos Industriais
Suínos
Testes de Sensibilidade a Antimicrobianos por Disco-Difusão
Águas Residuárias/microbiologia
Tipo de Publ: Artigo de Revista
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Research Support, Non-U.S. Gov't
Responsável: AR5.1 - Centro de Gestión del Conocimiento y las Comunicaciónes


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Texto completo SciELO Brasil
Texto completo
Id: lil-769580
Autor: Freitas, TMS.; Prudente, BS.; Oliveira, VA.; Oliveira, MNC.; Prata, EG.; Leão, H.; Montag, LFA..
Título: Influence of the flood pulse on the reproduction of Tocantinsia piresi (Miranda Ribeiro) and Auchenipterus nuchalis (Spix & Agassiz) (Auchenipteridae) of the middle Xingu River, Brazil / Influência do pulso de inundação na reprodução de Tocantinsia piresi (Miranda Ribeiro) e Auchenipterus nuchalis (Spix & Agassiz) (Auchenipteridae) do médio Rio Xingu, Brasil
Fonte: Braz. j. biol;75(3s1):158-167, Aug. 2015. tab, graf.
Idioma: en.
Projeto: CNPq; . CNPq.
Resumo: Abstract This study investigates the influence of the flood pulse on the reproductive biology of the auchenipterids Tocantisia piresi (Miranda Ribeiro, 1920) and Auchenipterus nuchalis (Spix & Agassiz, 1829) from the middle Xingu River in the Brazilian state of Pará. The specimens were collected every three months between April, 2012, and January, 2014, covering four distinct periods (flood, ebb, dry, and filling). The sex ratio, size at first maturity, gonadosomatic index, and condition factor were analysed in the two species, and evaluated in the context of the different hydrological periods. A total of 897 specimens of T. piresi were collected, of which 467 were female, and 430 males, and 383 A. nuchalis (286 females and 97 males). In T. piresi, the sex ratio was biased only in the filling and ebb periods, whereas in A. nuchalis, it departed significantly from the expected ratio of 1:1 in all periods, with a predominance of females. The female T. piresi mature at a smaller size than the males, with the opposite of the pattern being recorded in A. nuchalis. In T. piresi, the breeding peak was observed during the low water periods, whereas in A. nuchalis, the peak was recorded in the flood periods. Male and female T. piresi presented similar positively allometric growth rates, whereas in A. nuchalis, growth was negatively allometric, but rates were different between genders. A higher condition factor was recorded in the females of both species during the ebb period. Overall, the results of this study reveals distinct flood pulse effects on the reproductive parameters of the two auchenipterid species studied; for A. nuchalis the spawning seems to happen at the flood period and for T. piresi at the dry season of the middle Xingu River.

Resumo Analisamos a influência do pulso de inundação na biologia reprodutiva dos auchenipterídeos Tocantisia piresi (Miranda Ribeiro, 1920) e Auchenipterus nuchalis (Spix & Agassiz, 1829) no médio rio Xingu, no Estado do Pará, Brasil. Os indivíduos analisados foram coligidos por meio de capturas trimestrais entre os meses de abril de 2012 a janeiro de 2014 contemplando os quatro períodos hidrológicos (cheia, vazante, seca e enchente). A proporção sexual, o tamanho de primeira maturidade sexual, o índice gonadossomático e o fator de condição foram analisados para as duas espécies, e avaliados em função dos diferentes períodos hidrológicos. Foram coletados 897 espécimes de T. piresi, sendo 467 fêmeas e 430 machos, e 383 A. nuchalis, sendo 286 fêmeas e 97 machos. Para T. piresi a proporção sexual variou apenas nos períodos de enchente e vazante, enquanto que para A. nuchalis a proporção variou entre todos os períodos hidrológicos, com uma proporção maior de fêmeas do que machos. Em relação ao tamanho mínimo da primeira maturação sexual, as fêmeas de T. piresi maturam com tamanho inferior aos dos machos, enquanto que o inverso foi registrado para A. nuchalis. Para T. piresi a maior atividade reprodutiva foi registrada nos períodos de seca e enchente, enquanto que para A. nuchalis a maior atividade foi registrada na enchente e cheia. Machos e fêmeas de T. piresi não diferiram entre os padrões de crescimento, ambos apresentaram crescimento alométrico positivo. Já para A. nuchalis, o padrão de crescimento diferiu entre os sexos, embora ambos tenham apresentado crescimento alométrico negativo. Para as fêmeas de ambas as espécies foram observadas um maior fator de condição no período da vazante. Assim, nossos resultados evidenciam que o pulso de inundação pode influenciar de maneiras distintas os parâmetros reprodutivos destas duas espécies de auchenipterideos, pois a desolva de A. nuchalis parece acontecer no período de cheia e de T. piresi para a época de seca do Médio Rio Xingu.
Descritores: Tamanho Corporal
Peixes-Gato/fisiologia
Reprodução
Razão de Masculinidade
Maturidade Sexual
-Brasil
Peixes-Gato/crescimento & desenvolvimento
Inundações
Rios
Especificidade da Espécie
Limites: Animais
Feminino
Masculino
Tipo de Publ: Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME


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Machado, Rosangela Zacarias
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Id: lil-770308
Autor: Machado, Rosangela Zacarias; Silva, Jenevaldo Barbosa da; André, Marcos Rogério; Gonçalves, Luiz Ricardo; Matos, Carlos Antonio; Obregón, Dasiel.
Título: Outbreak of anaplasmosis associated with the presence of different Anaplasma marginale strains in dairy cattle in the states of São Paulo and Goiás, Brazil / Surto de anaplasmose associado com a presença de diferentes cepas de Anaplasma marginale em gado leiteiro dos estados de São Paulo e Goiás, Brasil
Fonte: Rev. bras. parasitol. vet;24(4):438-446, Oct.-Dec. 2015. tab, graf.
Idioma: en.
Resumo: Abstract The present study reports the genetic diversity of Anaplasma marginale during anaplasmosis outbreaks in rural properties of the states of Goiás and São Paulo, Brazil. Mortality rates of 3.5% (37/1,050) in calves, 4.7% (45/954) in heifers and 1.1% (25/2,200) in lactating cows were observed in a cattle herd of the municipality of Mambaí, state of Goiás, central-western Brazil. In a cattle herd from the municipality of Lins, state of São Paulo, in southeastern Brazil, none of the animals died, despite presenting clinical signs suggestive of bovine anaplasmosis and exhibiting a drastic decrease in milk production. Thus, blood samples were collected from 100 animals with clinical signs suggestive of bovine anaplasmosis in the municipalities of Mambaí and Lins. Based on the microsatellite structure of the MSP1a of A. marginale, the genotypes E and H were observed in Lins, and the C, D and E genotypes were found in Mambaí. The analysis of the tandem repeat structures of the MSP1a showed nine different strains (τ-10 -15, α-β2, α-β3-13, α-β2 192, τ-β-100, α-β2-Γ, 193-β-100, 191-13-Γ and 191-13-18) in Lins and two (α-β3-Γ and E-F-φ2-F2) in Mambaí. Three new tandem repeats of MSP1a (191, 192 and 193) were described. The τ-10-15 and α-β3-Γ strains were predominantly associated with the occurrence of clinical anaplasmosis and mortality in calves, heifers and lactating cows.

Resumo O presente estudo relata a diversidade genética de Anaplasma marginale durante surtos de anaplasmose bovina no Brasil em propriedades localizadas nos Estados de Goiás e São Paulo. No rebanho bovino de Mambaí, Estado de Goiás, Centro-oeste do Brasil, observaram-se taxas de mortalidade de 3,5% (37/1050) nos bezerros; 4,7% (45/954) nas novilhas e 1,1% (25/2200) nas vacas em lactação. No rebanho bovino de Lins, Estado de São Paulo, Sudeste do Brasil, embora os animais tenham apresentado sinais clínicos sugestivos de anaplasmose bovina, culminando em redução drástica da produção leiteira, nenhum animal veio a óbito. Assim, amostras de sangue de 100 bovinos com sinais clínicos sugestivos de anaplasmose foram coletadas em Mambaí-GO e Lins-SP. Baseando-se na estrutura do microssatélite da MSP1a de A. marginale, observou-se a presença dos genótipos E e H em Lins e C, D e E em Mambaí. A análise da estrutura em “tandem repeats” da MSP1a mostrou nove diferentes estirpes (τ-10 -15, α-β2, α-β3-13, α-β2 192, τ-β-100, α-β2-Γ, 193-β-100, 191-13-Γ e 191-13-18) em Lins e duas (α-β3-Γ e E-F-φ2-F2) em Mambaí. Três novos “tandem repeats” da MSP1a (191, 192 e 193) foram descritos. Foi observado predomínio das estirpes τ-10-15 e α-β3-Γ associado à ocorrência de anaplasmose clínica e mortalidade em bezerras, novilhas e vacas em lactação.
Descritores: Doenças dos Bovinos/epidemiologia
Surtos de Doenças/veterinária
Anaplasma marginale/classificação
Anaplasmose/epidemiologia
-Filogenia
Especificidade da Espécie
Brasil/epidemiologia
Lactação
Doenças dos Bovinos/parasitologia
Anaplasmose/parasitologia
Limites: Animais
Feminino
Bovinos
Responsável: BR1.1 - BIREME


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Id: lil-785164
Autor: Hoshino, Maria Danielle Figueiredo Guimarães; Neves, Lígia Rigôr; Tavares-Dias, Marcos.
Título: Parasite communities of the predatory fish, Acestrorhynchus falcatus and Acestrorhynchus falcirostris, living in sympatry in Brazilian Amazon / Comunidades de parasitos dos peixes predadores, Acestrorhynchus falcatus and Acestrorhynchus falcirostris, vivendo em simpatria na Amazônia brasileira
Fonte: Rev. bras. parasitol. vet;25(2):207-216tab, graf.
Idioma: en.
Resumo: Abstract This study investigated the parasite communities of wild Acestrorhynchus falcatus and Acestrorhynchus falcirostris populations living in sympatry in Brazilian Amazon. In these two hosts, a total of 12 parasite species e 1-9 parasite species were found per fish, and 10 of these species are metazoans. Eight species of parasites were common to both host species and four of them exhibited differences in abundance and/or prevalence. Parasite communities of the hosts were taxonomically similar (83%) and composed of both ectoparasites and endoparasites, and characterized by high prevalence and high abundance of endoparasites and an aggregated dispersion pattern. For A. falcirostris, the dominant parasite was Ichthyophthirius multifiliis, and for A. falcatus, it was Piscinoodinium pillulare. Shannon diversity and Berger-Parker dominance were similar for both hosts, while the parasites species richness and evenness showed differences influenced by the ectoparasites species. These two populations of hosts that inhabited the same geographical area had different sizes, but were exposed to the same infective stages, and acquired qualitatively and quantitatively similar endoparasites community, thus indicating that the amounts and types of prey congeneric that they were eating were similar. Therefore, the overlap in the same occurrence area play an important role in the parasite communities to these phylogenetically related hosts.

Resumo Este estudo investigou as comunidades parasitárias de populações naturais de Acestrorhynchus falcatus e Acestrorhynchus falcirostris, peixes piscívoros filogeneticamente relacionados e vivendo em simpatria na Amazônia brasileira. Nessas duas espécies de hospedeiros foram encontradas um total de 12 espécies de parasitos, 1-9 espécies de parasitos por peixe, e desse total de espécies de parasitos, 10 são metazoários. Oito espécies de parasitos foram comuns às duas espécies de hospedeiros e quatro deles apresentaram diferenças na abundância e/ou prevalência. As comunidades parasitárias desses hospedeiros foram taxonomicamente similares (83%) e compostas de ectoparasitos e endoparasitos, mas foram caracterizados por elevada prevalência e elevada abundância de endoparasitos com padrão de dispersão agregado. Para A. falcirostris, Ichthyophthirius multifiliis foi o parasito dominante, mas para A. falcatus foi Piscinoodinium pillulare. O índice de diversidade de Shannon e a dominância de Berger-Parker foram similares para ambos hospedeiros, enquanto a riqueza de espécies de parasitos e uniformidade apresentaram diferenças influenciadas pelas espécies de ectoparasitos. Estas duas populações de hospedeiros congenéricos que habitavam a mesma área geográfica tinham tamanhos diferentes, mas foram expostos aos mesmos estágios infectantes, adquirindo uma comunidade de endoparasitos qualitativa e quantitativamente similar, indicando assim que as quantidades e tipos de presa que eles estavam ingerindo foram similares. Portanto, a sobreposição em uma mesma área de ocorrência desempenhou um papel importante nas comunidades de parasitos para estes hospedeiros relacionados filogeneticamente.
Descritores: Caraciformes/parasitologia
Simpatria
Doenças dos Peixes/parasitologia
-Especificidade da Espécie
Brasil
Peixes
Limites: Animais
Responsável: BR1.1 - BIREME


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Id: biblio-886810
Autor: SOBOLESKI, VANESSA F; HIGUCHI, PEDRO; SILVA, ANA CAROLINA DA; SILVA, MARIELE A F DA; NUNES, AMANDA S; LOEBENS, RODINELI; SOUZA, KARINE DE; FERRARI, JHENIFFER; LIMA, CARLA L; KILCA, RICARDO V.
Título: Floristic-functional variation of tree component along an altitudinal gradient in araucaria forest areas, in Southern Brazil
Fonte: An. acad. bras. ciênc;89(3,supl):2219-2228, 2017. graf.
Idioma: en.
Resumo: ABSTRACT We aimed to investigate the taxonomic and functional variations of tree component of Araucaria Forest (AF) areas located along an altitudinal gradient (700, 900 and 1,600 m asl), in the southern region of Brazil. The functional traits determined were leaf area, specific leaf area, wood density, maximum potential height and dispersal syndromes and deciduousness. The data were analyzed through a functional and taxonomic dissimilarity dendrograms, community-weighted mean trait values, parametric and nonparametric tests, and Principal Component Analysis. The largest floristic-structural similarity was observed between the lower altitude areas (700 and 900 m asl), whose Bray-Curtis distance was 0.63. The area at 700 m asl was characterized by a predominance of deciduous and semi-deciduous species, with a high number of self- and wind-dispersed species, whereas the area at 1,600 m asl exhibited a predominance of animal-dispersed and evergreen species. It was also observed that there were significant variations for leaf traits, basic wood density and maximum potential height. Over all altitudinal gradient, the ordinations indicated that there was no evidence of functional differentiation among dispersal and deciduousness groups. In conclusion, the evaluated Araucaria Forest areas presented high floristic-functional variation of the tree component along the altitudinal gradient.
Descritores: Árvores/classificação
Biodiversidade
Altitude
-Especificidade da Espécie
Árvores/anatomia & histologia
Brasil
Florestas
Biomassa
Responsável: BR1.1 - BIREME


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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-886631
Autor: FABRIN, THOMAZ M C; PRIOLI, SONIA MARIA A P; PRIOLI, ALBERTO JOSÉ.
Título: Long-wavelength sensitive opsin (LWS) gene variability in Neotropical cichlids (Teleostei: Cichlidae)
Fonte: An. acad. bras. ciênc;89(1):213-222, Jan,-Mar. 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Cichlid fishes are an important group in evolutionary biology due to their fast speciation. This group depends widely of vision for feeding and reproduction. During the evolutionary process it plays a significant role in interspecific and intraspecific recognition and in its ecology. The molecular basis of vision is formed by the interaction of the protein opsin and retinal chromophore. Long-wavelength sensitive opsin (LWS) gene is the most variable among the opsin genes and it has an ecological significance. Current assay identifies interspecific variation of Neotropical cichlids that would modify the spectral properties of the LWS opsin protein and codons selected. Neotropical species present more variable sites for LWS gene than those of the African lakes species. The LWS opsin gene in Crenicichla britskii has a higher amino acid similarity when compared to that in the African species, but the variable regions do not overlap. Neotropical cichlids accumulate larger amounts of variable sites for LWS opsin gene, probably because they are spread over a wider area and submitted to a wider range of selective pressures by inhabiting mainly lotic environments. Furthermore, the codons under selection are different when compared to those of the African cichlids.
Descritores: Variação Genética
Opsinas de Bastonetes/genética
Ciclídeos/genética
-Filogenia
Especificidade da Espécie
Brasil
Códon/genética
Reação em Cadeia da Polimerase
Análise de Sequência de DNA
África
Ciclídeos/classificação
Limites: Animais
Responsável: BR1.1 - BIREME


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Id: biblio-886686
Autor: MENDONÇA, BRUNO A F DE; FERNANDES FILHO, ELPÍDIO I; SCHAEFER, CARLOS E G R; MENDONÇA, JÚLIA G F DE; VASCONCELOS, BRUNO N F.
Título: Soil-vegetation relationships and community structure in a "terra-firme"-white-sand vegetation gradient in Viruá National Park, northern Amazon, Brazil
Fonte: An. acad. bras. ciênc;89(2):1269-1293, Apr.-June 2017. tab, graf.
Idioma: en.
Resumo: ABSTRACT Viruá National Park encompasses a vast and complex system of hydromorphic sandy soils covered largely by the white sand vegetation ("Campinarana") ecosystem. The purpose of this study was to investigate a vegetation gradient of "terra-firme"-white sand vegetation at the Viruá National Park. Nine plots representing three physiognomic units were installed for floristic and phytosociological surveys as well as to collect composite soil samples. The data were subjected to assessments of floristic diversity and similarity, phytosociological parameters and to statistical analyses, focused on principal components (PC) and canonical correspondence analysis (CCA). The vegetation of the Campinaranas types and Forest differed in biomass and species density. Ten species, endemic to Brazil, were particularly well-represented. PC and CCA indicated a clear distinction between the studied plots, based on measured soil variables, especially base sum and clay, which were the most differentiating properties between Campinarana and Forest; For the separation of the Campinarana types, the main distinguishing variable was organic matter content and cation exchange capacity. Higher similarity of Campinaranas was associated to a monodominant species and the lower similarity of Forest was related to the high occurrence of locally rare species.
Descritores: Solo/química
Florestas
Biodiversidade
-Especificidade da Espécie
Árvores/classificação
Árvores/química
Brasil
Biomassa
Responsável: BR1.1 - BIREME



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