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| Registros recuperados: 2.661 | |
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| Moura,Elisa Ferreira; Ventrella,Marília Contin; Motoike,Sérgio Yoshimitsu. |
| Macaw palm (Acrocomia aculeata (Jacq.) Lodd. ex Mart.) is a tropical species with multiple uses, including oil supply for biodiesel production. However, structural and physiological studies of the seed are still scarce, as well as in vitro propagation techniques. The aim of this study was to characterize the anatomy, histochemistry and ultrastructure of the seed and the in vitro somatic embryo of A. aculeata, gaining insight into relationships between the post-harvest seed behavior and the somatic embryo conversion to plant. The zygotic embryo and the endosperm show high quantities of protein and lipids, stored in protein and lipid bodies, respectively. The cell wall storage polysaccharides occur in the thickened cell wall of the endosperm. The absence of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Macaw palm; Zygotic embryo; Endosperm; Storage reserves. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000400004 |
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| Kalil,Geovanita Paulino da Costa; Terra,Maurilo Monteiro; Kalil Filho,Antonio Nascimento; Macedo,Jefferson Luiz Vasconcello de; Pires,Erasmo José Paioli. |
| Este trabalho foi desenvolvido com o objetivo de avaliar a resposta do cultivar Maria (IAC 514-6) ao anelamento e à aplicação de ácido giberélico na concentração de 200ppm, no início ou após o florescimento, para as características dos cachos, bagos e engaços. O experimento foi realizado em Jundiaí, SP, e o delineamento estatístico foi inteiramente casualizado, com doze tratamentos e cinco repetições. Não foram detectados efeitos de época de anelamento ou de aplicação de ácido giberélico. Efeitos significativos do anelamento no tronco ou nos ramos e da aplicação do ácido giberélico ou de ambos os tratamentos foram detectados para as características estudadas. Os incrementos verificados para essas características foram semelhantes ao serem aplicados os... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Videira cv. Maria; Anelamento; Ácido giberélico. |
| Ano: 1999 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161999000200010 |
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| Shigaki,Francirose; Sharpley,Andrew; Prochnow,Luís Ignácio. |
| Eutrophication has become a major threat to water quality in the U.S., Europe, and Australasia. In most cases, freshwater eutrophication is accelerated by increased inputs of phosphorus (P), of which agricultural runoff is now a major contributor, due to intensification of crop and animal production systems since the early 1990s'. Once little information is available on the impacts of Brazilian agriculture in water quality, recent changes in crop and animal production systems in Brazil were evaluated in the context of probable implications of the fate of P in agriculture. Between 1993 and 2003, there was 33% increase in the number of housed animals (i.e., beef, dairy cows, swine, and poultry), most in the South Region (i.e., Paraná, Rio Grande do Sul, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diffuse pollution; Eutrophication; Poultry production; Swine production; Surface runoff. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000200013 |
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| MARTINS-CORDER,M.P.; MELO,I.S. de. |
| O presente trabalho visou testar e selecionar isolados selvagens de Trichoderma spp. quanto à capacidade antagônica ao fungo fitopatogênico Verticillium dahliae. Os ensaios in vitro consistiram de testes para avaliar a capacidade hiperparasítica e de antibiose através da produção de metabólitos voláteis e não voláteis. Pela técnica de culturas pareadas, 47 isolados de diversas espécies de Trichoderma foram avaliados e, pelos resultados obtidos, 20 foram selecionados. Através do teste de antibiose, selecionaram-se 7 isolados: T15P e Tal-1 (T. viride), TW6 e CNP311A (T. koningii), CNP17 e TCII (T. harzianum) e Tal-10 (T. aureoviride) os quais inibiram completamente o crescimento micelial de V. dahliae através da produção de metabólitos. Observações... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biocontrole; Parasitismo; Antagonismo; Trichoderma; Verticillium. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000100002 |
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| Belém-Costa,Andréa; Cyrino,José Eurico Possebon. |
| One of the most important problems involving treatments with antibiotics against Aeromonas hydrophila isolated from fishes is that antibiotic resistance develops readily. The antimicrobial activity of chemotherapeutants in isolates from pacu Piaractus mesopotamicus (Holmberg, 1887) and tilapia Oreochromis niloticus (Linnaeus, 1758) was tested by the Kirby-Bauer disk method, over Mueller-Hinton surface agar previously inoculated with 100 µL of bacterial suspensions. After regular incubation, isolates from tilapia and pacu were uniformly resistant to amoxicillin, ampicillin, lincomycin, novobiocin, oxacillin, penicillin, and trimetoprim+sulfametoxazole. The A. hydrophila type strain presented resistance to the same antimicrobial substances and also against... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Bacterial isolates; Bacterial strains; Antimicrobial substances; Chemotherapeutants; Drugs. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000300011 |
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| Melo,Flávia Mandolesi Pereira de; Fiore,Marli Fátima; Moraes,Luiz Alberto Beraldo de; Silva-Stenico,Maria Estela; Scramin,Shirlei; Teixeira,Manoel de Araújo; Melo,Itamar Soares de. |
| In the search for new organisms and new secondary metabolites, a study was conducted to evaluate the diversity of endophytic bacteria from ethnovarieties of cassava cultivated by Brazilian Amazon Indian tribes and also to study the secondary metabolites produced by a Bacillus pumilus strain. Sixty seven cassava endophytic bacteria were subjected to 16S rRNA sequencing and FAME analysis. The bacterial profile revealed that 25% of all endophytic isolates belonged to the genus Bacillus. The isolate B. pumilus MAIIIM4a showed a strong inhibitory activity against the fungi Rhizoctonia solani, Pythium aphanidermatum and Sclerotium rolfsii. Secondary metabolites of this strain were extracted using hexane, dichloromethane and ethyl acetate. Extracts were subjected... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ESI-MS/MS; Pumilacidin; Endophytic bacteria; Bioautography. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000500002 |
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| Pinto,José Maria; Botrel,Tarlei Arriel; Machado,Eduardo C.; Feitosa Filho,José C.. |
| A cultura do melão tem se firmado no Brasil como importante fonte de divisas para o agricultor, ocupando expressiva parcela na nossa pauta de exportações. A concentração do dióxido de carbono (CO2) na atmosfera era de 250 mimolCO2 mol-1 antes da revolução industrial, atingiu a 315 mimolCO2 mol-1 em 1958, estando, hoje, próximo de 365 mimolCO2 mol-1, com tendência de aumentar ainda mais. O aumento da concentração de CO2 aumenta a fotossíntese e a absorção de nutrientes pelas plantas. Nesse trabalho avaliaram-se a produtividade e as características dos frutos de melão em função da aplicação de CO2 via água de irrigação por gotejamento. A aplicação de CO2 foi realizada diariamente, três vezes por semana e sem aplicação de CO2 (testemunha) em três maneiras de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo; Fotossíntese; Qualidade de fruto. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162001000100006 |
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| TREJO-CHANDIA,J.E.; ANGELOCCI,L.R.; OLIVEIRA,R.F. de. |
| O método de balanço de calor é usado para monitorar fluxo de seiva em plantas de diversas espécies. Neste trabalho, estudou-se o desempenho e aplicabilidade do método, em mudas de limoeiro com diâmetros em torno de 18 mm. Os sensores foram avaliados em plantas envasadas, em casa de vegetação, sob condições naturais de temperatura e radiação solar. O desempenho do método foi avaliado comparando-se o fluxo de massa computado e as medidas gravimétricas de perda de massa, fazendo-se depois, análise de regressão. Os resultados indicam que os sensores tiveram uma precisão de 8% na escala horária e 11% na escala diária. A constante de tempo foi de 12 minutos, o que é um indicativo de que o método é adequado para medir fluxo de seiva em mudas de citros com boa... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sensores de medida; Fluxo de seiva; Transferência de calor. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161997000200018 |
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| Araujo,Rafael Canonenco de; Pires,Alexandre Vaz; Susin,Ivanete; Urano,Fumi Shibata; Mendes,Clayton Quirino; Rodrigues,Gustavo Henrique; Packer,Irineu Umberto. |
| Soybean hulls (SH) are an alternative fiber source that may be used to maintain neutral detergent fiber (NDF) concentration while increasing the energy concentration of ruminant diets. The objective of this experiment was to determine the effects of replacing coastcross (Cynodon sp.) hay NDF by SH NDF on the apparent digestibility of nutrients and nitrogen balance of Santa Inês ram lambs. Twenty-four animals (42.5 ± 3.6 kg of body weight and six months old) were placed in metabolism crates and assigned in a randomized complete block design defined by body weight (BW). Experimental diets provided a similar concentration of NDF (52%) and crude protein (15%). Hay NDF from a 70% roughage-based diet was replaced with SH NDF by 33%, 67%, and 100%, resulting in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: NDF; Hair sheep; Nitrogen balance; Santa Inês; Water intake. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600003 |
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| Sousa Junior,Vilmar Rodrigues de; Sabino,Luana Araújo; Moura,Daniella Jorge de; Nunhez,José Roberto; Sonoda,Lilia Thays; Silva,Alexandre Oliveira; Prada,Ronald Jaimes; Fontoura,Diener Volpin Ribeiro; Seber,Rogério Torres. |
| ABSTRACT: Ventilation systems used in swine facilities deserve to be studied because they directly affect productivity in the pig farming sector. Bearing this in mind the uniformity of air distribution and temperature is essential to animal welfare in this breeding environment. Thus, the purpose of this study was to identify whether changes in air entrances and exhaust fan positioning could influence air velocity and temperature distribution. The experimental data were collected in a commercial full-scale sow facility. Validation was carried out by comparing the simulated air temperatures and data measured in the field. These results showed agreement between data with a maximum relative error of approximately 3 %. The real settings showed a gradual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CFD; Airflow pattern; Temperature distribution. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000300173 |
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| Popovic,Tatjana; Milovanovic,Predrag; Aleksic,Goran; Gavrilovic,Veljko; Starovic,Mira; Vasic,Mirjana; Balaž,Jelica. |
| Halo blight, caused by Pseudomonas savastanoi pv. phaseolicola (Psp), is considered to be an important bacterial disease on common bean (Phaseolus vulgaris L.) in Serbia. Use of pathogen-free seeds is one of the most effective control measures against this disease. The aim of this study was to evaluate a detection method for Psp on untreated common bean seeds (23 genotypes) from commercial crops grown within Serbia. Detection of this pathogen was made by plating onto the modified sucrose peptone (MSP) and Milk Tween (MT) semi-selective mediums from soaked whole common bean seed. Colonies growing on the MSP medium were light yellow, convex and shiny, whereas on the MT medium, they were creamy white, flat and circular. The pathogenicity of the obtained... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MSP; MT; ELISA; Nested-PCR; Halo blight; Pathogenicity. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000400005 |
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| Liu,Yi; Yang,Shenjiao; Li,Shiqing; Chen,Fang. |
| Effects of meteorological variables on crop production can be evaluated using various models. We have evaluated the ability of the Hybrid-Maize model to simulate growth, development and grain yield of maize (Zea mays L.) cultivated on the Loess Plateau, China, and applied it to assess effects of meteorological variations on the performance of maize under rain-fed and irrigated conditions. The model was calibrated and evaluated with data obtained from field experiments performed in 2007 and 2008, then applied to yield determinants using daily weather data for 2005-2009, in simulations under both rain-fed and irrigated conditions. The model accurately simulated Leaf Area Index , biomass, and soil water data from the field experiments in both years, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crop simulation; Maize model; Potential productivity; Water stress; Spring maize. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000500003 |
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| Damian,Júnior Melo; Pias,Osmar Henrique de Castro; Cherubin,Maurício Roberto; Fonseca,Alencar Zachi da; Fornari,Ezequiel Zibetti; Santi,Antônio Luis. |
| ABSTRACT: The utilization of Normalized Difference Vegetation Index (NDVI) data obtained through satellite images can technically improve the process of delimiting management zones (MZ) for annual crops, resulting in socio-economic and environmental benefits. The aim of this study was to compare delimited MZ, using crop productivity data, with delimited MZ using the NDVI obtained from satellite images in areas under a no-tillage system. The study was carried out in three areas located in the state of Rio Grande do Sul, Brazil. Three crop productivity maps, from 2009 to 2015, were used for each area, whereby the NDVI was calculated for each crop productivity map using images from the Landsat series of satellites. Descriptive and geostatistical analysis were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fuzzy c-means clustering; Productivity data; Aerial images; Vegetation index. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000100101 |
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| Matthews,S.. |
| In comparisons of six seed lots of different F1 hybrid cultivars of cauliflower with similarly high laboratory germinations (above 90%) separation in germination was achieved after controlled deterioration (C.D.) at 24% moisture content (m.c.) and 45 0C for 24 hours. This measure of vigour was related to the position of the lots on the seed survival curve and was highly predictive of the longevity of the lots when stored at 15% m.c. and 20 0C for 12 and 16 weeks. When each seed lot was deteriorated at 24% m.c. for increasing times (from 0 to 36 hours) a reduction in the subsequent percentage germination was seen, which, using probit transformed percentages, was significantly and linearly related to the leakage of electrolytes into seed soak water over 24... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cauliflower; Controlled deterioration; Leakage; Electrical conductivity; Storage. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161998000500011 |
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| Arena,Gabriella Dias; Ramos-González,Pedro Luis; Nunes,Maria Andréia; Jesus,Camila Chabi; Calegario,Renata Faier; Kitajima,Elliot Watanabe; Novelli,Valdenice Moreira; Freitas-Astúa,Juliana. |
| ABSTRACT: Brevipalpus-transmitted viruses (BTV) are a taxonomically diverse group of plant viruses which severely affect a number of major crops. Members of the group can be sub-classified into cytoplasmic (BTV-C) or nuclear type (BTV-N) according to the accumulation sites of virions in the infected plant cells. Both types of BTV produce only local infections near the point of inoculation by viruliferous mites. Features of BTV-plant interactions such as the failure of systemic spread in their natural hosts are poorly understood. In this study we evaluated Arabidopsis thaliana, a model plant commonly used for the study of plant-virus interactions, as an alternative host for BTV. Infection of Arabidopsis with the BTV-N Coffee ringspot virus and Clerodendrum... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Clerodendrum chlorotic spot virus; Cilevirus; Solanum violaefolium ringspot virus; Coffee ringspot virus; Dichorhavirus. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000100085 |
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| Registros recuperados: 2.661 | |
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