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| Registros recuperados: 473 | |
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| Prodocimo,Viviane; Freire,Carolina Arruda. |
| Temperature as an environmental factor has been a frequent subject of study, since it affects either directly or indirectly all living organisms. The determination of thermal limits (critical thermal minima - CTmin and maxima - CTmax) for the tropical ornamental freshwater teleost Xiphophorus maculatus Günther, 1866 (platyfish) was performed after their acclimation to the following temperatures: 15, 20, 25, and 30ºC, for seven days. After this period, the water temperature was elevated or reduced at a rate of 0.125ºC/min until CTmax and CTmin could be determined as the temperature at which 50% of the animals had lost equilibrium. Mean values for CTmax and CTmin for the acclimation temperatures of 15, 20, 25, and 30ºC were respectively:... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xiphophorus maculatus; Temperature; Critical thermal maxima and minima; Acclimation; Platyfish. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000500007 |
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| Fanta,Edith. |
| The behavioural patterns and their cireadian rhythms may be adaptive to the peculiar environmental conditions of subtropical brackish waters where Ba-thygobius soporator Valenciennes, 1837 live. Adult fish were caught at the southern Brazilian coast from mangrove rivers and rocky shores in a bay, where temperature and water salinity vary during the day and through the year. Observation on the behaviour of the animals was undertaken in salinity 8.5ppt, 17.0ppt, 25.5ppt and 34.0ppt, each one in temperatures of 18ºC and 28ºC. Temperature and salinity affect the frequency and intensity of some of the behavioural events, more than its pattern or rhythm. Swimming is rare, decreasing along the day and with temperature increase, being even lower at low salinity;... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bathygobius soporator; Fish; Behaviour; Cireadian rhythm; Salinity; Temperature. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000100021 |
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| Molina Benavides,Raúl Andrés; Sánchez Guerrero,Hugo; Atzori,Alberto Stanislao. |
| Abstract Thermal environment is recognized to be one the most important ecological factor to determine domestic animal growth, development and productivity for direct and indirect effects on its physiology and behavior. Despite having specific and individual adaptation, is very common, within seasonal or diurnal temperature variations, animals deal with situations outside their thermal comfort zone. Due to heat stress, dairy cows reduce milk production and fertility, and therefore, had achieved an increasing in metabolic disorders incidence, causing low revenues to farm in short and medium periods. Due to world climate change more impact of the meteorological variables on animal responses is expected for the future. This study aimed to describe and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climate change; Grazing; Livestock production systems; Milk production; System dynamics; Temperature. |
| Ano: 2018 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100059 |
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| Galli,Juliana Altafin; Michelotto,Marcos Doniseti; Bernardes-Soares,Maria Beatriz; Mello-Martins,Antonio Lucio; Fischer,Ivan Herman. |
| Abstract Guava (Psidium guajava L.) presented prominence among the tropical fruit. Guava exports are still unimpressive, because of the quarantine pests, among them the fruit flies. The present research had as objective to evaluate the population fluctuation of fruit flies Anastrepha spp. and the fruits infestation caused in guava accesses cultivated in organic system, and study the possible correlations between this pest and meteorological factors. To estimate population fluctuation, 20 yellow sticky traps were used. The reviews were initiated in April 2013, for 378 days. The traps were kept in the field for the entire duration of the experiment, and they were reviewed every 14 days in most cases, during replacement of traps for new ones. With the data,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psidium guajava; Precipitation; Temperature; Varietal resistance. |
| Ano: 2019 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122019000100009 |
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| WOOLRICH-PIÑA,GUILLERMO A; GEOFFREY R,SMITH; LEMOS-ESPINAL,JULIO A; MONTOYA-AYALA,RAYMUNDO; ÁVILABOCANEGRA,LUIS E; BENAVIDES GARDUÑO,EDUARDO. |
| The distribution and abundance of organisms within a pond or lake can reflect the result of a variety of factors. We examined the abundance of the endemic fish, Poblana alchichica, in Lago de Alchichica, Puebla, Mexico, as well as how the abundance varied among months. Dissolved oxygen, temperature, and salinity varied among months. The abundance of Poblana alchichica peaked in December and February. For the months when fish were observed, their abundances were positively related to dissolved oxygen concentration and were generally not related to temperature. Our results provide evidence that there is substantial seasonal variation in the abundances of Poblana alchichica and that within months, their distributions are likely driven by dissolved oxygen than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abundance; Dissolved oxygen; Poblana alchichica; Salinity; Seasonal variation; Temperature. |
| Ano: 2012 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2012000100015 |
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| Ribeiro,Raquel Menestrino; Tessarolo,Geizianne; Soares,Thannya Nascimento; Teixeira,Itamar Rosa; Nabout,João Carlos. |
| ABSTRACT We experimentally evaluated how different temperatures affect germination of individual seedlings of Dipteryx alata, and estimated the impact of climate change on the species using ecological niche modeling. A total of 240 seeds were randomly distributed among three different temperature treatments (32 ºC, 36 ºC, and 40 ºC), and monitored for 35 days. We measured seven seed traits and estimated the ecological niche of D. alata using a consensus of four methods. The treatment with the highest temperature produced smaller and lighter seedlings. The consensus of ecological niche modeling indicated that are expected to reduce the areas with climates favorable for D. alata in future scenarios. Thus, our two results (experiment and ecological niche... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climatic scenarios; Germination; Global climate change; Ecological niche model; Temperature. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300446 |
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| Rezvani,Mohammad; Zaefarian,Faezeh; Amini,Vajihe. |
| Shepherd's purse (Capsella bursa-pastoris) is a problematic weed in citrus orchards and crop fields in northern Iran. In a series of laboratory and greenhouse experiments, we evaluated the effects that treatment with gibberellic acid (GA3) and potassium nitrate (KNO3), as well as environmental factors, including temperature, the duration of pre-chilling (wet and dry), drought stress, salt stress, pH, and sowing depth, have on seed dormancy breaking and germination in C. bursa-pastoris. Treatment with GA3 strongly stimulated germination of C. bursa-pastoris in conditions of light/dark and continuous darkness. The germination rate was highest (40.08%) for seeds treated with 400 ppm of GA3 in the light/dark condition. Treatment with KNO3 did not significantly... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drought and salt stress; Gibberellic acid; Light; Temperature; Sowing depth. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062014000400002 |
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| Strenske, Andressa; Vasconcelos, Edmar Soares de; Egewarth, Vanessa Aline; Herzog, Neusa Francisca Michelon; Malavasi, Marlene de Matos. |
| In this experiment, we assessed the germination and vigor of quinoa seeds packed in paper bags and stored at room temperature for 36, 85, 119, 146, 177 and 270 days. The seeds were harvested under experimental conditions in Marechal Candido Rondon, Paraná, during the 2012/13 growing seasons. Four replicates of 100 seeds each were established for each storage time, and the seeds were evaluated, on paper, based on the BOD under the following experimental temperature conditions: alternating temperatures of 20 and 30°C and a constant temperature of 25°C. The seeds from both treatments were subject to seven-hour photoperiods and 25°C under continuous darkness. The germinated seeds were counted daily for eight days after sowing, and we evaluated the percentages... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.03.03-2 Germination test; Temperature; Photoperiod; Seed vigor Produção e Beneficiamento de Sementes. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30989 |
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| Biaggioni, Marco Antônio Martin; UNESP - Botucatu; Lopes, Ana Beatriz de Castro; UNESP - Botucatu; Jasper, Samir Paulo; UNESP - Botucatu; Berto, Dirlei Antonio; UNESP - Botucatu; Gonçalves, Elisa Vidal; UNESP-Botucatu. |
| Visando estabelecer a contribuição dos parâmetros físicos na qualidade final da silagem de grãos úmidos de milho, foi conduzido experimento, no interior de câmara climatizada, simulando cinco condições de temperatura ambiente (5°C 24h-1 por dia; 25°C 24h-1 por dia; 40°C 24h-1 por dia; 20°C 16h-1 por dia + 5°C 8h-1 por dia; 30°C 16h-1 por dia + 20°C 8h-1 por dia) e duas condições de pressão no interior dos tambores de armazenagem (com e sem pressão interna). Para se determinar os efeitos sobre o grau de disponibilidade do amido na silagem pronta, procedeu-se a análises para avaliar a qualidade final da silagem (teor de umidade, pH, ácidos orgânicos, amido total e granulometria). O delineamento... |
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Palavras-chave: 5.01.00.00-9 Agronomia silagem; Qualidade; Temperatura; Pressão silage; Quality; Temperature; Pressure. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/325 |
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| Caixeta, Marilda Pereira; UEM; Corazza, Maria Júlia; UEM; Oliveira, Ricardo Ribeiro de; UEM; Zanutto, Carlos Alexandre; UEM; Nunes, William Mário de Carvalho; UEM; Vida, João Batista; UEM. |
| O presente trabalho teve como objetivo identificar 11 isolados de Guignardia citricarpa, agente causal da mancha preta dos citros (MPC), obtidos de frutas cítricas sintomáticas de diferentes regiões geográficas, por meio da PCR e caracterização morfofisiológica das estruturas propagativas, esporulação e crescimento micelial em diferentes meios de cultura, temperaturas e regimes de luz, nas condições de laboratório. Pelo teste de PCR, todos os isolados foram identificados como o patógeno G. citricarpa. Os isolados caracterizados foram submetidos às temperaturas de 20, 25 e 30ºC, em regime de luz contínua, escuro contínuo e fotoperíodos de 12 horas, durante 24 dias. Utilizaram-se os meios de cultura aveia-ágar (AA), batata-dextrose-ágar (BDA) e... |
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Palavras-chave: 5.01.02.00-1 Fitossanidade G. citricarpa; PCR; Esporulação; Crescimento micelial; Temperatura; Meio de cultura; Fotoperíodo. G. citricarpa; PCR; Sporing; Mycelial growth; Temperature; Mean of culture; Photoperiod. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/5962 |
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| Costa, Lílian Moreira; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Resende, Osvaldo; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Gonçalves, Douglas Nascimento; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Souza, Kelly Aparecida; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Sales, Juliana de Fátima; Instituto Federal de Educação, Ciência e Tecnologia Goiano - campus Rio Verde – Goiás; Donadon, Juliana Rodrigues; Instituto Federal de Educação - campus Rio Verde. |
| This study was performed to evaluate the physiological quality of Crambe abyssinica Hochst fruits subjected to drying under different treatments with air. The crambe fruits, with moisture content of 21.0 ± 1.3 (% w.b.), were manually collected and dried until their moisture content reached 7.0 ± 1.4 (% w.b.). The crambe fruits were dried with natural air (23°C mean temperature and 60.6% average relative humidity) and seven days after harvest in an experimental dryer with forced ventilation at temperatures of 30, 40, 50, 60 and 70°C and relative humidities of 37.4, 22.3, 14.0, 8.3 and 5.1%, respectively. The evaluation was the percent germination, the germination speed index (GSI), the amount of water absorption and the electrical conductivity. The results... |
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Palavras-chave: Oilseed; Temperature; Crambe abyssinica Hochst 5.01.03.03-2 Produção e Beneficiamento de Sementes. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/12482 |
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| Martins, Samuel Julio; Medeiros, Flavio Henrique Vasconcelos; Souza, Ricardo Magela; Vilela, Laize Aparecida Ferreira. |
| Abiotic stress interferes with plant-microbial interactions, but some microorganisms may buffer this interference. We investigated the interaction between temperature and bacterial wilt (Curtobacterium flaccumfaciens pv. flaccumfaciens - Cff) biocontrol and the ability of Bacillus subtilis strain ALB629 to colonize bean seedlings, to inhibit pathogen growth and to use different C and N sources. B. subtilis ALB629rif, a mutant selected from the wild population of ALB629, was used to monitor plant colonization at 20°C and 30°C. ALB629rif was detected only in the plant roots (103.22 CFU g-1) at the lower temperature but colonized the roots, stems, and leaves (105.85, 104.48, and 104.01 CFU g-1), respectively, at 30ºC. The area under the disease progress curve... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 5.01.02.01-0 seed treatment; Phaseolus vulgaris; Antibiosis; Temperature; Rhizobacteria; PGPR Fitopatologia. |
| Ano: 2014 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/18018 |
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| Toledo, Vagner de Alencar Arnaut de; UEM; Neves, Carolina Antunes; Copebrás; Alves, Eloi Machado; UEM; Oliveira, Jussara Ricardo de; Universidade Paranaense; Ruvolo-Takasusuki, Maria Cláudia Colla; UEM; Faquinello, Patrícia; UEM. |
| O objetivo foi avaliar o efeito da suplementação proteica sobre a produção de geleia real em colônias de Apis mellifera e correlacionar esta produção com as variáveis climáticas. Os tratamentos foram: colônias que receberam uma ração elaborada com 35% de proteína; colônias que receberam suplemento proteico comercial com 35% de proteína bruta e colônias que não receberam ração proteica. Não houve diferença (p > 0,05) entre os tratamentos para as variáveis de produção. As médias foram: quantidade de larvas aceitas, 8,56 ± 6,76; porcentagem de aceitação, 29,20 ± 22,03%; quantidade de geleia real produzida por colônia, 1,83 ± 0,82 g e quantidade produzida por cúpula, 213,58 ± 108,36 mg. A precipitação pluviométrica não influenciou (p > 0,05) a produção... |
| Tipo: Pesquisa de campo |
Palavras-chave: 5.04.05.00-4 Apis mellifera; Nutrição de abelhas; Proteína; Umidade relativa; Temperatura 5.04.05.02-0 Apis mellifera; Honeybee nutrition; Protein; Relative humidity; Temperature. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/6836 |
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| Dias Junior, Walter; Mourgués-Schurter, Lea Rosa; UFLA. |
| To evaluate circadian changes in thyroid hormones of piau, Leporinus obtusidens Valenciennes, 1847, (Osteichthyes, Anostomidae) after feeding were determined the plasma levels of thyroid hormones (TH) of 128 fishes, same age, immature, both sexes, distributed into four classes of weight. They were kept in 16 aquaria (100 L), with artificial aeration and 2 L min. -1 water flow, from March to August, 1996, in Aquaculture Station of the Universidade Federal de Lavras (UFLA). Daily, feed was supplied at 5% body weight. For blood samples, the fishes were anesthetized with benzocaine 10%, and plasmatic levels of TH were determined at 1, 4, 7, 10, 13, 16 and 22h after food supply during 4 consecutive days in June and in August, period of lowest temperature. The... |
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Palavras-chave: 2.07.04.00-3 T3 T4; Teleost fish; Temperature; Photoperiod Fisiologia Comparada. |
| Ano: 2009 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5814 |
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| Registros recuperados: 473 | |
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