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Spatial pattern detection modeling of thrips (Thrips tabaci) on onion fields; Detecção de padrões espaciais na ocorrência do tripes (Thrips tabaci) na cultura da cebola

RIBEIRO JR, Paulo Justiniano; VIOLA, Denise Nunes; DEMÉTRIO, Clarice Garcia Borges; MANLY, Bryan F.; FERNANDES, Odair Aparecido
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
45.86%
Onion (Allium cepa) is one of the most cultivated and consumed vegetables in Brazil and its importance is due to the large laborforce involved. One of the main pests that affect this crop is the Onion Thrips (Thrips tabaci), but the spatial distribution of this insect, although important, has not been considered in crop management recommendations, experimental planning or sampling procedures. Our purpose here is to consider statistical tools to detect and model spatial patterns of the occurrence of the onion thrips. In order to characterize the spatial distribution pattern of the Onion Thrips a survey was carried out to record the number of insects in each development phase on onion plant leaves, on different dates and sample locations, in four rural properties with neighboring farms under different infestation levels and planting methods. The Mantel randomization test proved to be a useful tool to test for spatial correlation which, when detected, was described by a mixed spatial Poisson model with a geostatistical random component and parameters allowing for a characterization of the spatial pattern, as well as the production of prediction maps of susceptibility to levels of infestation throughout the area.; A cebola é uma das hortaliças mais cultivadas e consumidas no Brasil e sua importância social se deve à grande demanda por mão-de-obra. Uma das principais pragas que afeta essa cultura é o tripes do prateamento (Thrips tabaci) e sua distribuição espacial...

Plasticity of stomatal distribution pattern and stem tracheid dimensions in Podocarpus lambertii: an ecological study

Locosselli, Giuliano Maselli; Ceccantini, Gregorio
Fonte: OXFORD UNIV PRESS; OXFORD Publicador: OXFORD UNIV PRESS; OXFORD
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
66.04%
Leaf and wood plasticity are key elements in the survival of widely distributed plant species. Little is known, however, about variation in stomatal distribution in the leaf epidermis and its correlation with the dimensions of conducting cells in wood. This study aimed at testing the hypothesis that Podocarpus lambertii, a conifer tree, possesses a well-defined pattern of stomatal distribution, and that this pattern can vary together with the dimensions of stem tracheids as a possible strategy to survive in climatically different sites. Leaves and wood were sampled from trees growing in a cold, wet site in south-eastern Brazil and in a warm, dry site in north-eastern Brazil. Stomata were thoroughly mapped in leaves from each study site to determine a spatial sampling strategy. Stomatal density, stomatal index and guard cell length were then sampled in three regions of the leaf: near the midrib, near the leaf margin and in between the two. This sampling strategy was used to test for a pattern and its possible variation between study sites. Wood and stomata data were analysed together via principal component analysis. The following distribution pattern was found in the south-eastern leaves: the stomatal index was up to 25 higher in the central leaf region...

Detecção e modelagem de padrão espacial em dados binários e de contagem; Detection and modelling of space pattern in binary and counting data

Viola, Denise Nunes
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 19/04/2007 PT
Relevância na Pesquisa
45.89%
A distribuição espacial de insetos e doenças em campos comerciais é importante, por exemplo, para aplicação racional de pesticidas. Entretanto, não tem sido considerada nas recomendações de manejo da cultura, planejamento de experimentos e estudos amostrais, sendo escassa literatura a esse respeito. Os artigos apresentados nessa tese foram motivados por duas situações diferentes, uma envolvendo dados de contagem e a outra, dados binários. Os dois modelos diferem em relação às estratégias da descrição da estrutura de dependência espacial. No primeiro artigo, a variável resposta é contagem. Para caracterizar o padrão espacial da dispersão do tripes do prateamento da cebola foi feito um levantamento anotando-se o número de insetos por fase de desenvolvimento em folhas de plantas de cebola, em diferentes datas e pontos amostrais dentro de quatro propriedades com fazendas vizinhas apresentando diferentes níveis de infestação e métodos de plantio. O teste de aleatorização de Mantel foi utilizado para testar a presença de padrão espacial, que quando detectado foi descrito por um modelo de Poisson misto espacial com componente aleatório geoestatístico. Tal modelo possibilitou a caracterização do padrão espacial bem como a obtenção de mapas de predição dos níveis de susceptibilidade à infestação na área. No segundo artigo a variável resposta é binária e foi feito um estudo de simulação para verificar o comportamento dos estimadores de pseudo-verossimilhança dos parâmetros do modelo autologístico...

Estudos sobre Variabilidade de Amostragem, Distribui-cao e Abundancia de Larvas de Peixes da Regiao Sudes-te do Brasil; Study on sampling variability, distribution and abundance of fish larvae off the Southeastern Coast of Brazil

Katsuragawa, Mario
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 17/04/1985 PT
Relevância na Pesquisa
45.86%
Utilizando-se materiais coletados durante qua-tro cruzeiros oceanográficos com o N/Oc ."Prof. W. Besnard", na região Sudeste do Brasil, compreendida entre Cabo Frio (RJ) e Florianópolis (SC), de janeiro de 1980 a março de 1982, foram realizados estudos quali quantitativos so-bre ocorrências de larvas de peixes, relacionando-as com fatores abióticos. Problemas concernentes aos processos de amostragem tambem foram verificadas. Realizaram-se dois tipos de arrastos: arrasto oblíquo com a rede Bongo usando-se malhagens de 0,333 mm (fina) e de 0,505 mm (regular), e arrasto horizontal de superfície com a rede de Neuston, de 0,333 mm de malhagem. Em cada estação oceanográfica, alem das amostras biologicas, efetuaram-se as medições de temperatura e coleta de água para determinação de salinidade. Um total de 35.090 larvas foram analisadas, incluíndo as coletas das redes fina e regular da Bongo e a rede de Neuston. Dentre estas, 61 grupos diferentes foram separados, chegando a níveis específicos em alguns casos.- Dois gêneros e quatro especies foram identificados pela primeira vez na região: Saurida spp, Hygophum spp, Trachinocephalus myops, Synodus foetens Bregmaceros can-tori e Maurolicus muelleri. As famílias predominantes foram Clupeidae...

Soil sampling intensity and spatial distribution pattern of soils attributes and corn yield in no-tillage system

Rodrigues, Marcos S.; Corá, José E.; Fernandes, Carolina
Fonte: Associação Brasileira de Engenharia Agrícola (SBEA) Publicador: Associação Brasileira de Engenharia Agrícola (SBEA)
Tipo: Artigo de Revista Científica Formato: 852-865
ENG
Relevância na Pesquisa
45.97%
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP); Processo FAPESP: 08/52559-3; Tendo em vista ser a intensidade amostral de atributos do solo um fator determinante para a aplicação dos conceitos de agricultura de precisão, este trabalho foi conduzido para determinar o padrão de distribuição espacial de atributos do solo e da produtividade de milho em quatro intensidades de amostragem de solo e verificar a influência da intensidade amostral na compreensão da relação de causa e efeito entre atributos do solo e produtividade. Para isto, utilizou-‑se uma malha amostral de 100 pontos referenciados, na qual cada célula amostral de 45 m² era composta por cinco linhas de 10 m da cultura, onde o ponto referenciado foi considerado o centro da célula. As amostras foram realizadas nas profundidades de 0-0,1 e 0,1-0,2 m para avaliar atributos químicos e a textura do solo. A partir dos 100 pontos, obtiveram-se conjuntos de dados com 100; 75; 50 e 25 pontos amostrais. Os dados foram submetidos à análise estatística descritiva e à geoestatística. A melhor intensidade amostral para determinação do padrão de distribuição espacial foi dependente do atributo do solo estudado. Os teores de P e K+ no solo apresentaram maior variabilidade espacial...

Spatial pattern detection modeling of thrips (Thrips tabaci) on onion fields

Ribeiro Jr, Paulo Justiniano; Viola, Denise Nunes; Demétrio, Clarice Garcia Borges; Manly, Bryan F.; Fernandes, Odair Aparecido
Fonte: Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ) Publicador: Universidade de São Paulo (USP), Escola Superior de Agricultura Luiz de Queiroz (ESALQ)
Tipo: Artigo de Revista Científica Formato: 90-99
ENG
Relevância na Pesquisa
45.86%
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); A cebola é uma das hortaliças mais cultivadas e consumidas no Brasil e sua importância social se deve à grande demanda por mão-de-obra. Uma das principais pragas que afeta essa cultura é o tripes do prateamento (Thrips tabaci) e sua distribuição espacial, embora importante, não tem sido considerada nas recomendações de manejo da cultura, planejamento de experimentos ou estudos amostrais. O objetivo desse artigo foi considerar métodos estatísticos para detectar e modelar padrões espaciais na ocorrência do tripes do prateamento da cebola. Para caracterizar o padrão espacial da dispersão do tripes do prateamento da cebola foi feito um levantamento anotando-se o número de insetos por fase de desenvolvimento em folhas de plantas de cebola, em diferentes datas e pontos amostrais dentro de quatro propriedades com fazendas vizinhas apresentando diferentes níveis de infestação e métodos de plantio. O teste de aleatorização de Mantel mostrou-se útil para testar a presença de padrão espacial, que quando detectado foi descrito por um modelo de Poisson misto espacial com componente aleatório geoestatístico com parâmetros que possibilititam a caracterização do padrão espacial...

Spatial point pattern analysis of gorilla nest sites in the Kagwene Sanctuary, Cameroon: Towards understanding the nesting behavior of a critically endangered subspecies

Neba, Funwi-Gabga
Fonte: Universidade Nova de Lisboa Publicador: Universidade Nova de Lisboa
Tipo: Dissertação de Mestrado
Publicado em 07/03/2011 ENG
Relevância na Pesquisa
45.99%
Dissertation submitted in partial fulfillment of the requirements for the Degree of Master of Science in Geospatial Technologies.; Gorilla nest site data from the Kagwene sanctuary, Cameroon were analyzed to foster an understanding of the nesting behavior of Cross River Gorillas. The main objective of the study was to verify the pattern of nest site distribution in the sanctuary, the influence of environmental covariates and possible interaction between nest sites and between nest sites of two gorilla groups – the Major and Minor groups. Spatial point pattern analysis methods were implemented in the R software environment for this purpose. Overall, we sought to fit models that could best estimate an intensity function for nest site distribution in the sanctuary. Resulting models revealed that nest site distribution does not conform to a Poisson process, and that the data can be better described by a combination of environmental factors and interaction between nest sites. Univariate models fitted to different nest site categories proved to be more useful than bivariate models in defining intensity functions for nest site distribution. The final model category chosen for the data therefore constituted a combination of the effect of covariates and higher-order interaction between nest sites. This set of models...

The distribution pattern of Lutzomyia longipalpis (Diptera: Psychodidae) in the peridomiciles of a sector with canine and human visceral leishmaniasis transmission in the municipality of Dracena, São Paulo, Brazil

Rangel,Osias; Sampaio,Susy Mary Perpetuo; Ciaravolo,Ricardo Mario de Carvalho; Holcman,Marcia Moreira
Fonte: Instituto Oswaldo Cruz, Ministério da Saúde Publicador: Instituto Oswaldo Cruz, Ministério da Saúde
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/03/2012 EN
Relevância na Pesquisa
55.91%
The specimen distribution pattern of a species can be used to characterise a population of interest and also provides area-specific guidance for pest management and control. In the municipality of Dracena, in the state of São Paulo, we analysed 5,889 Lutzomyia longipalpis specimens collected from the peridomiciles of 14 houses in a sector where American visceral leishmaniasis (AVL) is transmitted to humans and dogs. The goal was to analyse the dispersion and a theoretical fitting of the species occurrence probability. From January-December 2005, samples were collected once per week using CDC light traps that operated for 12-h periods. Each collection was considered a sub-sample and was evaluated monthly. The standardised Morisita index was used as a measure of dispersion. Adherence tests were performed for the log-series distribution. The number of traps was used to adjust the octave plots. The quantity of Lu. longipalpis in the sector was highly aggregated for each month of the year, adhering to a log-series distribution for 11 of the 12 months analysed. A sex-stratified analysis demonstrated a pattern of aggregated dispersion adjusted for each month of the year. The classes and frequencies of the traps in octaves can be employed as indicators for entomological surveillance and AVL control.

Soil sampling intensity and spatial distribution pattern of soils attributes and corn yield in no-tillage system

Rodrigues,Marcos S.; Corá,José E.; Fernandes,Carolina
Fonte: Associação Brasileira de Engenharia Agrícola Publicador: Associação Brasileira de Engenharia Agrícola
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/10/2012 EN
Relevância na Pesquisa
45.97%
Taking into account that the sampling intensity of soil attributes is a determining factor for applying of concepts of precision agriculture, this study aims to determine the spatial distribution pattern of soil attributes and corn yield at four soil sampling intensities and verify how sampling intensity affects cause-effect relationship between soil attributes and corn yield. A 100-referenced point sample grid was imposed on the experimental site. Thus, each sampling cell encompassed an area of 45 m² and was composed of five 10-m long crop rows, where referenced points were considered the center of the cell. Samples were taken from at 0 to 0.1 m and 0.1 to 0.2 m depths. Soil chemical attributes and clay content were evaluated. Sampling intensities were established by initial 100-point sampling, resulting data sets of 100; 75; 50 and 25 points. The data were submitted to descriptive statistical and geostatistics analyses. The best sampling intensity to know the spatial distribution pattern was dependent on the soil attribute being studied. The attributes P and K+ content showed higher spatial variability; while the clay content, Ca2+, Mg2+ and base saturation values (V) showed lesser spatial variability. The spatial distribution pattern of clay content and V at the 100-point sampling were the ones which best explained the spatial distribution pattern of corn yield.

Spatial pattern detection modeling of thrips (Thrips tabaci) on onion fields

Ribeiro Jr,Paulo Justiniano; Viola,Denise Nunes; Demétrio,Clarice Garcia Borges; Manly,Bryan F.; Fernandes,Odair Aparecido
Fonte: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" Publicador: São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/02/2009 EN
Relevância na Pesquisa
45.86%
Onion (Allium cepa) is one of the most cultivated and consumed vegetables in Brazil and its importance is due to the large laborforce involved. One of the main pests that affect this crop is the Onion Thrips (Thrips tabaci), but the spatial distribution of this insect, although important, has not been considered in crop management recommendations, experimental planning or sampling procedures. Our purpose here is to consider statistical tools to detect and model spatial patterns of the occurrence of the onion thrips. In order to characterize the spatial distribution pattern of the Onion Thrips a survey was carried out to record the number of insects in each development phase on onion plant leaves, on different dates and sample locations, in four rural properties with neighboring farms under different infestation levels and planting methods. The Mantel randomization test proved to be a useful tool to test for spatial correlation which, when detected, was described by a mixed spatial Poisson model with a geostatistical random component and parameters allowing for a characterization of the spatial pattern, as well as the production of prediction maps of susceptibility to levels of infestation throughout the area.

Histological analysis of the distribution pattern of glandular tissue in normal inferior nasal turbinates

Millas,Ieda; Liquidato,Bianca Maria; Dolci,José Eduardo Lutaif; Fregnani,José Humberto Tavares Guerreiro; Macéa,José Rafael
Fonte: Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial Publicador: Associação Brasileira de Otorrinolaringologia e Cirurgia Cervicofacial
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/08/2009 EN
Relevância na Pesquisa
45.89%
Nasal turbinates play an important role in nasal physiology. These functions include the important function of particle filtration by the mucocilliary system. Many nasal mucosal diseases, such as rhinitis and rhinosinusitis, are directly related with structural alterations of the mucosal lining of the turbinates. AIM: To study the distribution pattern of the glandular epithelium of the lamina propria in the normal lower nasal turbinate mucosa of the anterior, medium and posterior portions. MATERIAL AND METHOD: A prospective study in which small linear fragment of the lower nasal turbinate was removed from ten patients undergoing aesthetic nose surgery. The slides were hematoxilin-eosin stained, examined histologically and photographed. Glandular epithelium was delimited individually, the total area of the lamina propria on the anterior, medium and posterior portions of nasal turbinates was calculated (µm2). RESULTS: There was no statistically significant difference in the distribution pattern of the glandular epithelium of the lamina propria. CONCLUSION: This study showed no predominance of glandular epithelium distribution in anterior and posterior portions of lower nasal turbinates in normal subjects.

Distribution pattern of lysosomal granules in fibroblasts of the Chediak-Higashi syndrome.

Abe, K; Arashima, S; Honma, M
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /05/1982 EN
Relevância na Pesquisa
45.86%
Cultured fibroblasts from a patient with the Chediak-Higashi syndrome, the mother of the patient, and a normal control were studied by light and electron microscopy. The distribution pattern of PAS-positive and acid phosphatase-containing granules in the cytoplasm differed significantly in the fibroblasts from the patient when compared with those from the mother and control. The granules in the fibroblasts from the patient were clustered in the perinuclear area, whereas the granules in the fibroblasts from the mother and control were dispersed throughout the cytoplasm. After incubation with ascorbic acid, the clustered granules in the fibroblasts of the Chediak-Higashi syndrome showed a tendency to spread throughout the cytoplasm. The distribution pattern of the granules was studied by quantitative morphology.

Differences in predominant T cell phenotypes and distribution pattern in reactional lesions of tuberculoid and lepromatous leprosy.

Narayanan, R B; Laal, S; Sharma, A K; Bhutani, L K; Nath, I
Fonte: PubMed Publicador: PubMed
Tipo: Artigo de Revista Científica
Publicado em /03/1984 EN
Relevância na Pesquisa
45.86%
The nature and histological pattern of the cutaneous infiltrates of 17 leprosy patients in reversal reactions (Type I) and erythema nodosum leprosum (Type II, ENL) were compared with tissues from 18 non-reactional borderline leprosy (BT, BL) and lepromatous leprosy (LL) patients using monoclonal antibodies and immunofluorescence. Reactional BT lesions showed a mild increase in OKT11+ pan T cells as compared to non-reactional tissues and a significant influx of OKT8+ (suppressor/cytotoxic) cells which were peripherally localized in the lymphocyte mantle surrounding the epithelioid cells. The Leu 3a+ (helper/inducer) cells were scattered amongst the lymphocytes and macrophages. The mean ratio (+/- s.d.) of Leu 3a+/OKT8+ cells was 1.88 +/- 0.64 in Type I BT reactions as compared to 2.95 +/- 0.95 in BT lesions. In contrast, lesions of BL reversal reactions and ENL showed a more marked increase in pan T cells with a preponderance of the helper/inducer subset, Leu 3a+/OKT8+ ratio being 2.26 +/- 0.61 and 0.93 +/- 0.57 in BL reactional and non-reactional lesions, respectively. Interestingly, this increase in the numbers of the T cells reached levels observed in BT lesions. The distribution pattern of OKT8+ cells was similar to Leu 3a+, both being diffusely scattered amongst the bacilli laden macrophages. Ia like antigens were present in all granulomas and were abundant on lymphocytes and macrophages and less conspicuous on epithelioid cells. T6+ Langerhans cells were uniformly increased in all reactional lesions. It would appear that the changes observed in both Type I and Type II reactions are similar in the lepromatous group of patients. They differ significantly from the BT reversal reaction in terms of the dominant T cell subset and the microanatomical distribution of the OKT8+ cells in the lesions.

Unique somato-dendritic distribution pattern of Kv4.2 channels on hippocampal CA1 pyramidal cells

Kerti, Katalin; Lorincz, Andrea; Nusser, Zoltan
Fonte: Blackwell Publishing Ltd Publicador: Blackwell Publishing Ltd
Tipo: Artigo de Revista Científica
Publicado em /01/2012 EN
Relevância na Pesquisa
45.86%
A-type K+ current (IA) plays a critical role in controlling the excitability of pyramidal cell (PC) dendrites. In vitro dendritic patch-pipette recordings have demonstrated a prominent, sixfold increase in IA density along the main apical dendrites of rat hippocampal CA1 PCs. In these cells, IA is mediated by Kv4.2 subunits, whose precise subcellular distribution and densities in small-diameter oblique dendrites and dendritic spines are still unknown. Here we examined the densities of the Kv4.2 subunit in 13 axo-somato-dendritic compartments of CA1 PCs using a highly sensitive, high-resolution quantitative immunogold localization method (sodium dodecyl sulphate-digested freeze-fracture replica-labelling). Only an approximately 70% increase in Kv4.2 immunogold density was observed along the proximo-distal axis of main apical dendrites in the stratum radiatum with a slight decrease in density in stratum lacunosum-moleculare. A similar pattern was detected for all dendritic compartments, including main apical dendrites, small-diameter oblique dendrites and dendritic spines. The specificity of the somato-dendritic labelling was confirmed in Kv4.2−/− tissue. No specific immunolabelling for the Kv4.2 subunit was found in SNAP-25-containing presynaptic axons. Our results demonstrate a novel distribution pattern of a voltage-gated ion channel along the somato-dendritic surface of CA1 PCs...

Biochemical Characteristics and PrPSc Distribution Pattern in the Brains of Cattle Experimentally Challenged with H-type and L-type Atypical BSE

Priemer, Grit; Balkema-Buschmann, Anne; Hills, Bob; Groschup, Martin H.
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 21/06/2013 EN
Relevância na Pesquisa
45.92%
Besides the classical form of bovine spongiform encephalopathy (BSE) that has been known for almost three decades, two atypical forms designated H-type and L-type BSE have recently been described. While the main diagnostic feature of these forms is the altered biochemical profile of the accumulated PrPSc, it was also observed in the initial analysis that L-type BSE displays a distribution pattern of the pathological prion protein (PrPSc), which clearly differs from that observed in classical BSE (C-type). Most importantly, the obex region in the brainstem is not the region with the highest PrPSc concentrations, but PrPSc is spread more evenly throughout the entire brain. A similar distribution pattern has been revealed for H-type BSE by rapid test analysis. Based on these findings, we performed a more detailed Western blot study of the anatomical PrPSc distribution pattern and the biochemical characteristics (molecular mass, glycoprofile as well as PK sensitivity) in ten different anatomical locations of the brain from cattle experimentally challenged with H- or L-type BSE, as compared to cattle challenged with C-type BSE. Results of this study revealed distinct differences in the PrPSc deposition patterns between all three BSE forms...

Factors Affecting the Distribution Pattern of Wild Plants with Extremely Small Populations in Hainan Island, China

Chen, Yukai; Yang, Xiaobo; Yang, Qi; Li, Donghai; Long, Wenxing; Luo, Wenqi
Fonte: Public Library of Science Publicador: Public Library of Science
Tipo: Artigo de Revista Científica
Publicado em 15/05/2014 EN
Relevância na Pesquisa
45.89%
Understanding which factors affect the distribution pattern of extremely small populations is essential to the protection and propagation of rare and endangered plant species. In this study, we established 108 plots covering the entire Hainan Island, and measured the appearance frequency and species richness of plant species with extremely small populations, as well as the ecological environments and human disturbances during 2012–2013. We explored how the ecological environments and human activities affected the distribution pattern of these extremely small populations. Results showed that the extremely small populations underwent human disturbances and threats, and they were often found in fragmental habitats. The leading factors changing the appearance frequency of extremely small populations differed among plant species, and the direct factors making them susceptible to extinction were human disturbances. The peak richness of extremely small populations always occurred at the medium level across environmental gradients, and their species richness always decreased with increasing human disturbances. However, the appearance frequencies of three orchid species increased with the increasing human disturbances. Our study thus indicate that knowledge on how the external factors...

The distribution pattern of Halicephalobus gingivalis in a horse is suggestive of a haematogenous spread of the nematode

Henneke, Christina; Jespersen, Anna; Jacobsen, Stine; Nielsen, Martin K; McEvoy, Fintan; Jensen, Henrik E
Fonte: BioMed Central Publicador: BioMed Central
Tipo: Artigo de Revista Científica
Publicado em 19/09/2014 EN
Relevância na Pesquisa
45.86%
The majority of Halicephalobus gingivalis-infections in horses have been fatal and are usually not diagnosed before necropsy. Therefore, knowledge about the nematode and the pathogenesis of infection in horses is limited. This has resulted in an on-going discussion about the port of entry and subsequent dissemination of H. gingivalis within the host. The present case of H. gingivalis-infection in a horse was diagnosed ante mortem. Post mortem findings, the distribution pattern of H. gingivalis nematodes in the brain, a high prevalence of inflammation in close relation to blood vessels, and the presence of the nematode in multiple organs with a disseminated pattern of distribution strongly suggested a haematogenous spread of the nematode in the horse.

The distribution pattern of myofibroblasts in the stroma of human bladder carcinoma depends on their invasiveness

Shimasaki, N.; Kuroda, Naoto; Miyazaki, E.; Hayashi, Yoshihiro; Toi, M.; Hiroi, Makoto; Enzan, H.; Shuin, T.
Fonte: Murcia : F. Hernández Publicador: Murcia : F. Hernández
Tipo: Artigo de Revista Científica Formato: application/pdf
ENG
Relevância na Pesquisa
45.91%
The presence of myofibroblasts has been elucidated in the stroma of neoplasm of various organs. In the present article, we studied the distribution of myofibroblasts in the stroma of bladder carcinoma. Twenty-five surgical resected bladder tumors (urothelial carcinoma, n=21; combined urothelial carcinoma and adenocarcinoma, n=2; sarcomatoid squamous cell carcinoma, n=1; combined urothelial carcinoma and squamous cell carcinoma, n=1) were selected and we evaluated the distribution of myofibroblasts using immunohistochemical, electron and immunoelectron microscopic techniques. Immunohistochemically, the distribution pattern of myofibroblasts in invasive and non-invasive carcinomas were predominantly fascicular and reticular forms, respectively. Moreover, myofibroblasts around bladder carcinoma cells were confirmed by electron microscope. Understanding the distribution pattern of myofibroblasts in the stroma of bladder carcinoma may provide available information about the presence of carcinoma invasion.

Estrutura espacial e diamétrica de espécies arbóreas e seus condicionantes em um fragmento de cerrado sentido restrito no sudoeste goiano; Spatial distribution pattern and size structure of tree species and its structuring factors in a fragment of the Brazilian cerrado

Bernasol, Wilson Pereira; Lima-Ribeiro, Matheus de Souza
Fonte: brasil; Programa de Pós-Graduação em Ecologia e Evolução Publicador: brasil; Programa de Pós-Graduação em Ecologia e Evolução
Tipo: Artigo de Revista Científica
POR
Relevância na Pesquisa
55.97%
v. 37, n. 2, p. 181-198, 2010; The aim of this study was to analyze population structure and spatial distribution pattern of five tree species in a fragment of cerrado stricto sensu in the southwest of the Goiás State, Brazil. Fifty quadrats of 10 × 10 m (100 m2 ) were surveyed, and all individuals within each quadrat were sampled. The theoric distributions of Poisson and Negative Binomial and two indices of dispersion, the variance to mean ratio (I) and the Green’s coefficient (Ig ), were used to detect the spatial pattern of the populations. The population structure was verified by the frequencies distribution of six size classes. An aggregated spatial pattern was detected for all species, with smaller individuals segregated spatially from bigger individuals, except for Qualea grandiflora Mart., and also the distribution of size classes in “reverse J-shaped”, but with many particularities. This suggests differences in the structural pattern of the populations investigated and, consequently, in its dynamics and structuring processes.; O objetivo deste estudo foi verificar o padrão espacial e a estrutura populacional de cinco espécies arbóreas em um fragmento de cerrado sentido restrito no município de Jataí...

ARBOREOUS SPECIES POPULATION IN A TOPOGRAPHIC GRADIENT OF MIXED OMBROPHILOUS FOREST IN RIO GRANDE DO SUL; ARBOREOUS SPECIES POPULATION IN A TOPOGRAPHIC GRADIENT OF MIXED OMBROPHILOUS FOREST IN RIO GRANDE DO SUL

Narvaes, Igor da Silva; Instituto Nacional de Pesquisas Espaciais/Centro Regional da Amazônia - INPE/CRA - Pesquisador; Longhi, Solon Jonas; Universidade Federal de Santa Maria - UFSM - Professor; Kilca, Ricardo de Vargas; Universidade Federal de Santa M
Fonte: FUPEF DO PARANÁ Publicador: FUPEF DO PARANÁ
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Artigo Avaliado pelos Pares Formato: application/pdf
Publicado em 24/04/2014 POR
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AbstractThis study was part of the Long Term Ecological Project (PELD) conducted in the São Francisco de Paula National Forest, RS where Mixed Ombrophilous Forest is predominant. The aim was to identify distribution of arboreous species depending on different soil conditions occurring in the low, medium and upper slopes of the studied area. 180 sample units of 100 m2 distributed along the topographical gradient were installed, with identification of the totality of arboreous species with 3 cm ≤ CBH < 30 cm and height exceeding 1.30 meters. In addition, thirteen environmental variables were collected in each sub-unit. The Canonical Correspondence Analysis model (CCA) indicated that only the slope, the topographic position, the stoniness and the soil color (up to 50 cm in depth) were the variables that best distinguished the sample groups of the slope environments. Out of the 53 species included in the model, ten species showed best correlations with the typical environments of upper slopes and 12 species were most characteristics of the lower positions, while the remaining resulted well adapted to different hillside topographic conditions. Environmental preferences of the species could be considered in silvicultural and recuperation programs applied to hillside environments of the region.Keywords:  Araucarian Forest; species distribution pattern...