Home Itens selecionados Provedores de dados OAI Créditos Sobre Ajuda

			Busca avançada
	Provedor de dados AgEcon (6) ArchiMer (1) Autor Bangsund, Dean A. (2) Leistritz, F. Larry (2) Alom, Fardous (1) Devadoss, Stephen (1) Evenson, Robert E. (1) Frusher, Stewart (1) Ghosh, Joydeep (1) Hamon, Katell (1) Holland, David W. (1) Lee, John G. (1) Little, L. Richard (1) Mwabu, Germano (1) Paarlberg, Philip L. (1) Seitzinger, Ann Hillberg (1) Stodick, Leroy (1) Thebaud, Olivier (1) Mais... Palavra-chave Economic effects (7) Expenditures (2) Fishing (2) Hunting (2) Livestock Production/Industries (2) North Dakota (2) Resource /Energy Economics and Policy (2) Agricultural and Food Policy (1) Agricultural extension (1) Asia (1) Australia (1) D60 (1) Demand and Price Analysis (1) Demand decline (1) Food price (1) Foot-and-mouth disease (1) ITQ (1) International Relations/Trade (1) Jasus edwardsii (1) Livestock (1) Mais... Tipo do documento Working or Discussion Paper (3) Journal Article (2) Conference Paper or Presentation (1) Text (1) Ano 2011 (1) 2009 (1) 2006 (1) 2003 (3) 1998 (1) País United States (6) France (1) Idioma Inglês (7)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 157 Primeira ... 1 2 3 4 5 6 7 8 ... Última Effects of physiological and management factors on the milk composition of rambouillet ewes Agrociencia Ochoa-Cordero,Manuel A.; Torres-Hernández,Glafiro; Mandeville,Peter B.; Díaz-Gómez,Marta O.. Abstract The effects of physiological and management factors on the milk composition of Rambouillet ewes under confined management at the Sheep Unit, Agronomy Faculty, Universidad Autónoma de San Luis Potosí, México, were evaluated. Two treatments were randomly assigned to 45 single and twin-rearing ewes, 2-5 years old: 6 and 8 weeks of lactation, which were the dates when the lambs were weaned. Milk samples were taken during lactation (weeks 1, 3, 6, 8, and 12), and chemically analyzed using standard laboratory procedures for protein, fat, total solids, ash and lactose percentages. Statistical analysis was performed utilizing a model that included the fixed effects of lambing number (LN: 1-3+), birth type (BT: single, twins), lamb sex (LS: ram lambs, ewe... Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental factors; Ewes; Intensive management; Milk components. Ano: 2007 URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952007000300263 Annual, seasonal and spatial abundance of the seabob shrimp Xiphopenaeus kroyeri (Decapoda, Penaeidae) off the Southeastern coast of Brazil Anais da ABC (AABC) HECKLER,GISELE S.; LOPES,MATEUS; SIMÕES,SABRINA M.; SHIMIZU,ROBERTO M.; COSTA,ROGERIO C. DA. We investigated the influence of environmental factors in spatial and temporal distribution of the seabob shrimp Xiphopenaeus kroyeri in Santos Bay and São Vicente Estuary, state of São Paulo, Brazil. Monthly samples were obtained, from May 2008 through April 2010, from four locations in the estuary and four in the bay. No individual was collected in the estuary and this was attributed to the low salinity means recorded in this environment. We collected 109,153 individuals in the bay and there was no difference in abundance between the two years comprised by the study period. The similarity in spatial distribution can be related to sediment grain size that in all sampling locations showed great amount of very fine sand. The largest amount of reproductive... Tipo: Info:eu-repo/semantics/article Palavras-chave: Distribution; Environmental factors; Estuary; Santos Bay. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000301337 Germination responses of the invasive Calotropis procera (Ait.) R. Br. (Apocynaceae): comparisons with seeds from two ecosystems in northeastern Brazil Anais da ABC (AABC) LEAL,LAURA C.; MEIADO,MARCOS V.; LOPES,ARIADNA V.; LEAL,INARA R.. Life history traits are considered key indicators of plant invasibility. Among them, the germination behavior of seeds is of major relevance because it is influenced by environmental factors of invaded ecosystem. Here, we investigated how seed traits and seed tolerance to environmental factors on seed germination of Calotropis procera vary depending on the invaded ecosystems in northeastern Brazil. We have tested seeds from two vegetation types – Caatinga and Restinga – to different levels of light intensity, salinity, and water stress. Previous to those experiments, seed-set and morphometric analysis were carried out for both studied populations. We have observed a higher seed-set in Caatinga. Seeds produced in this ecosystem had lower seed moisture... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biological invasions; Caatinga; Environmental factors; Restinga; Seed germination; Seed-set. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301025 Different slopes of a mountain can determine the structure of ferns and lycophytes communities in a tropical forest of Brazil Anais da ABC (AABC) NETTESHEIM,FELIPE C.; DAMASCENO,ELAINE R.; SYLVESTRE,LANA S.. A community of Ferns and Lycophytes was investigated by comparing the occurrence of species on different slopes of a paleoisland in Southeastern Brazil. Our goal was to evaluate the hypothesis that slopes with different geographic orientations determine a differentiation of Atlantic Forest ferns and lycophytes community. We recorded these plants at slopes turned towards the continent and at slopes turned towards the open sea. Analysis consisted of a preliminary assessment on fern beta diversity, a Non Metric Multidimensional Scaling (NMDS) and a Student t-test to confirm if sites sampling units ordination was different at each axis. We further used the Pearson coefficient to relate fern species to the differentiation pattern and again Student's t-test to... Tipo: Info:eu-repo/semantics/article Palavras-chave: Atlantic rain forest; Topography; Pteridophytes; Richness; Environmental factors. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000100199 Effect of environmental factors on the abundance of decapod crustaceans from soft bottoms off southeastern Brazil Anais da ABC (AABC) FURLAN,MICHELE; CASTILHO,ANTONIO L.; FERNANDES-GÓES,LISSANDRA C.; FRANSOZO,VIVIAN; BERTINI,GIOVANA; COSTA,ROGéRIO C. DA. This study investigated the importance of variations in environmental factors affecting the abundance patterns of decapods on the southeastern Brazilian coast. Sampling was carried out monthly from January 1998 through December 1999 in Ubatumirim and Mar Virado, Ubatuba region, using a commercial shrimp fishing boat equipped with double-rig nets. Six areas adjacent to rocky shores were chosen. Bottom-water samples were collected using a Nansen bottle, to measure the temperature and salinity. Sediment samples were also obtained by means of a Van Veen grab, for determination of texture and organic-matter content. The association of environmental factors with species abundance was evaluated by Canonical Correspondence Analysis (α = 0.05). Forty-one species of... Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic species; Decapod crustaceans; Environmental factors; Habitat selection. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401345 Temporal and spatial variations in tidepool fish assemblages of the northeast coast of Brazil Biota Neotropica Cunha,Francisca Edna de Andrade; Monteiro-Neto,Cassiano; Nottingham,Mara Carvalho. Temporal and spatial variations and environmental factors influencing the structure of tidepool fish assemblages were quantitatively investigated at Iparana beach, northeast Brazilian coast. The majority of the tidepool fishes sampled were suprabenthic juvenile individuals of great mobility. We recorded during monthly diurnal underwater visual censuses a total of 4,750 fish from 26 species, represented mainly by partial residents from the families Scaridae, Haemulidae, Gerreidae and Pomacentridae. The number of species and individuals showed significant variability among tidepools as a response to variations in their volume and type of substrate cover. The greatest species abundance and richness associated with rocks covered with algae suggested that... Tipo: Info:eu-repo/semantics/article Palavras-chave: Tidepool fishes; Environmental factors; Seasonality; Diversity; Abundance. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032007000100016 Benthic macroinvertebrate community structure and seasonal variation in a neotropical stream in the State of Alagoas, Brazil Biota Neotropica Linares,Marden Seabra; Faccioli,Gregorio Guirado; Freitas,Liriane Monte. This paper presents a study on the macrobenthic community in the Salvia stream, a headwater stream that runs through a conserved Atlantic forest fragment in the state of Alagoas, Brazil, and identifies the environmental factors that most influence the community structure. Ten sampling sites were chosen, conducting each collection during the rainy season of 2010 and the dry season of 2011. At each site the macroinvertebrates were collected using a D net (0.250 mm mesh). Water samples were collected and taken to the laboratory to analyze Dissolved Oxygen, Conductivity, pH and Alkalinity. Water temperature, surface current speed and depth were measured at the site. Canonical Correspondence was used to analyze the effect of environmental factors on the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic insects; Diversity; Environmental factors; Lotic environment; Zoobenthic fauna. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300050 Structure and composition of fish assemblages from São Sebastião Channel tide pools, southwestern Atlantic Biota Neotropica Pastro,Gabriela; Dias,Gustavo Muniz; Gibran,Fernando Zaniolo. Abstract Organisms living in tide pools in the intertidal zone are exposed to daily and abrupt changes in temperature, dissolved oxygen, pH and salinity, during tidal cycles. Fish assemblages in tide pools are usually very different from those in surrounding areas; resident species exhibit morphological and ecological adaptations to deal with such a variable environment. In this study, we described the environmental conditions and the fish diversity and composition from four tide pools at the continental margin of the São Sebastião Channel, São Sebastião (23º41'-23º54'S; 45º19'-45º30'W), in southeastern Brazil. Monthly, from January to December 2011, we sampled four tide pools (12 samples per pool), applying a standard protocol to record environmental... Tipo: Info:eu-repo/semantics/article Palavras-chave: Subtropical fish; Intertidal zone; Environmental factors; Species richness; Southeastern Brazil. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300204 Sensitivity to halothane and its relationship to the development of PSE (Pale, Soft, Exudative) meat in female lineage broilers BABT Marchi,Denis Fabrício; Trindade,Marco Antônio; Oba,Alexandre; Soares,Adriana Lourenço; Ida,Elza Iouko; Ferraz,José Bento Sterman; Michelan Filho,Tércio; Ziober,Iris Lamberti; Shimokomaki,Massami. This work aimed to evaluate female lineage broilers for halothane sensitivity and for their susceptibility to the subsequent development of PSE meat. The halothane test was carried out in an anesthetic chamber with 3.0% halothane. The unconscious birds were examined for leg muscle rigidity. If one or both legs became extended and rigid, the birds were classified as halothane sensitive (HAL+), while unresponsive birds were classified as halothane negative (HAL-). The results showed that of 298 birds aged 42 days old, 95.6% were HAL- and 4.4% were HAL+. A sample of pectoralis major muscle was collected from HAL- (n=105) and HAL+ (n=13) birds. The pH and breast fillet color were determined at 4ºC, 24 hours post-mortem. Interestingly, only 2.5% of HAL+ birds... Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental factors; Pectoralis major; Meat color abnormality. Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000700028 Environmental factors affecting sporulation of Fuligo septica (Myxomycetes) on sugar cane bagasse BABT Chiappeta,Alda de Andrade; Sena,Kêsia Xisto Fonseca R. de; Cavalcanti,Laise de Holanda. The influence of environmental factors on sporulation of Fuligo septica (L.) Wigg. and the abundance of this species on sugar cane bagasse (Saccharum officinarum L.), stored outdoors was studied.In Northeastern Brazil, between January/1997 and January/1998, a total of 29 specimens were collected through monthly collections of aethalia. The relationships between the abundance of aethalia and rainfall, temperature, relative humidity of the air and insolation were studied. Results indicated that on the substrate analyzed, F. septica was an abundant species. Sporulation occurred in all seasons of the year, with a well-defined peak at the end of winter and beginning of spring (August/September),which was strongly influenced by rainfall. Tipo: Info:eu-repo/semantics/article Palavras-chave: Fuligo septica; Myxomycetes; Phenology; Environmental factors. Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100002 Characterization of the physical and chemical parameters of Ubatuba Bay, Northern Coast of São Paulo State, Brazil BJB MANTELATTO,F. L. M.; FRANSOZO,A.. The objective of the present study is to characterize the physical and chemical environmental parameters of Ubatuba Bay (SP), as a subsidy for studies of the composition and distribution of benthic crustaceans which live on the non-consolidated sublittoral bottom of this area. Depth, temperature, salinity, dissolved oxygen, organic content and granulometric composition of the sediments were measured monthly from September/95 to August/96 in eight subareas of the bay. The bay presents an average depth of 9.3 m and is characterized by the following annual mean values for the hydrologic factors: temperature 23.8 ºC, salinity 33.2‰ and dissolved oxygen 5.11 mg/l. The annual mean for the organic matter content of the bay bottom sediments was 11.8% and most... Tipo: Info:eu-repo/semantics/article Palavras-chave: Crustacea; Environmental factors; Sediment; Organic content; Ubatuba; Brazil. Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100004 An evaluation and partial characterization of a bacteriocin produced by Lactococcus lactis subsp lactis ST1 isolated from goat milk BJM Taheri,Parinaz; Samadi,Nasrin; Ehsani,Mohammad Reza; Khoshayand,Mohammad Reza; Jamalifar,Hossein. A bacteriocin-like inhibitory substance producing Lactococcus lactis subsp lactis strain, ST1, isolated from goat milk of Iranian origin and with broad spectrum of activity and desirable technical properties was used for evaluating some futures of bacteriocin inhibitory activity. Cell growth and bacteriocin production studies were carried out in MRS medium incubated statically under uncontrolled pH condition. The antibacterial activity presented a primary metabolite pattern and showed a rapid decrease at the stationary phase. Microaerobiosis and capnophily growth conditions resulted in higher bacteriocin production while aerobiosis showed negative effect on both cell growth and bacteriocin production. Bacteriocin production, on the other hand, was favored... Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactococcus lactis subsp lactis ST1; Bacteriocin production; Environmental factors; Bacteriocin release; Ultrasound shock. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822012000400029 Nitrogenase activity of Beijerinckia derxii is preserved under adverse conditions for its growth BJM Barbosa,Heloiza R.; Moretti,Marcos A.; Thuler,Daniela S.; Augusto,Elisabeth F.P.. In order to evaluate the response of Beijerinckia derxii ICB-10 to different environmental factors, growth curves and specific nitrogenase activity were studied. Tested conditions were as follows: a) media with different pH values (2.5, 2.8, 4.2 and 5.7); b) medium supplemented with 230 µM aluminium sulphate; c) media with two different potassium phosphate concentrations (50 mM and 100 mM); d) shaken or still cultures; e) medium supplemented with 40 mM sodium thiosulphate. Growth curves and specific nitrogenase activity at pH 4.2 were closely similar to those for cultures at pH 5.7 (standard condition), whereas no growth occurred at pH 2.5. Changes in growth curves and/or specific nitrogenase activity were observed under the following conditions: I) pH 2.8... Tipo: Info:eu-repo/semantics/article Palavras-chave: Beijerinckia; Nitrogenase; Nitrogen fixation; Growth; Environmental factors. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000300007 Ecophysiology of papaya: a review Braz. J. Plant Physiol. Campostrini,Eliemar; Glenn,David M.. Papaya (Carica papaya L.) is a principal horticultural crop of tropical and subtropical regions. Knowledge of how papaya responds to environmental factors provides a scientific basis for the development of management strategies to optimize fruit yield and quality. A better understanding of genotypic responses to specific environmental factors will contribute to efficient agricultural zoning and papaya breeding programs. The objective of this review is to present current research knowledge related to the effect of environmental factors and their interaction with the photosynthetic process and whole-plant physiology. This review demonstrates that environmental factors such as light, wind, soil chemical and physical characteristics, temperature, soil water,... Tipo: Info:eu-repo/semantics/article Palavras-chave: Carica papaya; Environmental factors; Photosynthesis; Water relations; Water-use efficiency. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400010 Thermal requirements and estimated number of generations of Neopamera bilobata (Say) in strawberry-producing regions of Brazil Ciência Rural Kuhn,Taciana Melissa de Azevedo; Loeck,Alci Enimar; Botton,Marcos. ABSTRACT: The thermal threshold and thermal requirements of Neopamera bilobata were determined, and the number of generations that this species may produce in the main strawberry-producing regions of Brazil was estimated. In a climate chamber (70±10% RH and 12h photophase) at 16, 19, 22, 25, 28, or 30±1°C, the development of 120 eggs was monitored until the adult stage, at each temperature. Nymphs were maintained in individual cages and fed on strawberry fruits of the cultivar Aromas. The mean duration and viability of the egg and nymph stages were calculated by estimating the lower and upper developmental thresholds and the thermal constant, and this information was used to estimate the number of generations per year in different strawberry-producing... Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental factors; Thermal requirements; Predictive models. Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000100153 Radiation levels of UV-A and UV-B on growth parameters and coumarin content in guaco Ciência Rural Alves,Luciano; Deschamps,Cícero. ABSTRACT: Guaco is a medicinal plant species containing coumarin, a secondary metabolite whose concentration is influenced by various factors, such as the level of exposure to UVA (315-400 nm) and UVB (280-315 nm) radiation, age of the plant, and position of the storage organ in the plant. This study aimed to assess the effect of different blocking levels of UVA and UVB radiation on growth parameters and coumarin content of two guaco accessions. Treatments did not affect any of the growth parameters assessed, except leaf area. Coumarin content was higher in leaves collected from the upper canopy and with unblocked exposure to UVA and UVB. Tipo: Info:eu-repo/semantics/article Palavras-chave: Mikania glomerata Spreng; 1-2-benzopyrone; Secondary metabolism; Growth analysis; Environmental factors. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000600403 Environmental risk factors related to the development of canine non-Hodgkin's lymphoma Ciência Rural Zanini,Danielle Almeida; Kimura,Katia Cristina; Nishiya,Adriana Tomoko; Ubukata,Rodrigo; Leandro,Rafael Magdanelo; Brito,Claudia Prado de; Trombetti,Márcia; Lagoa,Ana Carolina; Macedo,Thais Rodrigues; Rodrigues,Lucas Campos de Sá; Rosendo,Janaína Aparecida da Silva; Arndt,Helen Lyrio; Dias,Ricardo Augusto; Dagli,Maria Lúcia Zaidan. This research aimed to investigate the possible risk factors associated with the development of canine non-Hodgkin's lymphoma. Owners of 83 dogs with non-Hodgkin's lymphoma and of 84 healthy dogs answered an epidemiological questionnaire. Dogs who lived outside of the house and within 100 meters of busy streets or avenues (defined as more than 50 vehicles per minute) had a higher risk for developing the disease (OR: 3.1, 95% CI: 1.4-6.9, P=0.005). These results suggest that air pollution derived from vehicle traffic may be associated with the development of canine non-Hodgkin's lymphoma. Tipo: Info:eu-repo/semantics/article Palavras-chave: Pollution; Epidemiologic questionnaire; Environmental factors; Environmental tobacco smoke. Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000700025 Registros recuperados: 157 Primeira ... 1 2 3 4 5 6 7 8 ... Última

Empresa Brasileira de Pesquisa Agropecuária - Embrapa Todos os direitos reservados, conforme Lei n° 9.610 Política de Privacidade Área restrita		Embrapa Parque Estação Biológica - PqEB s/n° Brasília, DF - Brasil - CEP 70770-901 Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco