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Desempenho e atividade de lipase em tilápias do Nilo
Moura,G.S.; Oliveira,M.G.A.; Lanna,E.A.T.;
Archivos de Zootecnia , 2012, DOI: 10.4321/S0004-05922012000300005
Abstract: the objective was to evaluate the effects of temperature on performance and activity of lipase in the nile tilapia, thai lineage. the experimental design was completely randomized with four treatments (20, 24, 28 and 32oc), six replicates and ten fishes per experimental unit. the diet was the same for all treatments. at 55 days of experiment were evaluated apparent feed intake, weight gain, apparent feed conversion, lipase activity and specific lipase activity. the apparent feed intake and weight gain increased linearly with temperature increase. for apparent feed conversion, quadratic effect was observed as a function of temperature, showing a conversion improvement of 1.79 to 1.00 with the increase of the temperature until 29,15oc. linear effect in lipase and specific lipase activities was observed too as a result of temperature, comprising high lipase activity at 32oc. water temperature influences the performance and amylase activity in nile tilapia.
Apparent Digestibility Coefficients of Pelleted Feed Incorporated with Water Hyacinth Echhornia crassipes Fed to Red Tilapia, [Oreochromis mossambicus (Peters, 1852) X Oreochromis niloticus (Linnaeus, 1758)]
E.A.T. Mubarak,M.A. Amiza,H.K. Bakhsh,A.B. Abol-Munafi
Agricultural Journal , 2013, DOI: 10.3923/aj.2011.322.326
Abstract: A 3 weeks feeding trial was conducted to evaluate the Apparent Digestibility Coefficients (ADCs) of dry matter, protein, gross energy, nitrogen, crude lipid and fiber of Water Hyacinth (WH), Echhornia crassipes meal incorporated in pelleted test feeds (0, 10, 15, 20 and 25%, dry matter basis) for red tilapia fingerlings. Chromium dioxide (1%) was added as an inert bio-marker to iso-nitrogenous (35.00±0.20% crude protein) and iso-caloric (4.00±0.52 kcal kg-1) feeds. Results showed that the maximum value (p = 0.05) of ADCs for dry matter (68.09%) was recorded for the control feed with 0% WH while the minimum value of 50.36% was recorded for the test feed 4 including 20% WH. Similarly, the maximum ADCs values (p = 0.05) for crude protein, gross energy, ether extract, crude lipid and crude fiber were also found in control feed while the minimum values were observed in test feed 4 including 20% WH. The study was clearly indicated that red tilapia fingerlings efficiently digest the nutrients when only the maximum inclusion of WH 20% in their feed does not exceed 20% of WH meal (on dry basis).
Differences in the Performance and Phosphorus-Use Efficiency of Some Tropical Rice (Oryza sativa L.) Varieties
E.A. Akinrinde,T. Gaizer
Pakistan Journal of Nutrition , 2006,
Abstract: Deficiency of phosphorus (P) is widespread in tropical and temperate acid soils. Six rice (Oryza sativa L) varieties (TOX 4008 – 34, TOX 3499-84, FARO 51, LOCAL CHECK, FAROX 317, and WAT 107 – TGR) were evaluated for their P nutrition capability at 0, 50, 100, 150 and 200 mg kg-1 levels of P applied in an Alfisol. Plant height (from 3 weeks after planting, WAP), number of tillers (from 4 WAP), as well as dry matter (DM) yields, P concentration and uptake in partitioned plant parts and P - use efficiency parameters were estimated after 6 weeks of growth. Plant height at 4 WAP, content and uptake of P determined in shoot and root were significantly (P < 0.01) influenced by P application rates. The varieties also differed significantly in their growth; DM production and P - use efficiency, thus permitting their categorization into efficient or non-efficient and responsive or non-responsive types.
Alleviation of temperature stress by nutrient management in crop plants: a review
Waraich,E.A; Ahmad,R; Halim,A; Aziz,T;
Journal of soil science and plant nutrition , 2012, DOI: 10.4067/S0718-95162012000200003
Abstract: the effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiments in egypt. the aim of the study was to determine the vulnerability of wheat to extreme weather event under climate change scenarios. eight fertigation treatments, in addition to farmer irrigation were tested. two climate change scenarios obtained from hadley climate change model were incorporated in cropsyst model to assess wheat yield responses to fertigation regimes under these scenarios. the results showed that the highest yield and the highest water use efficiency (wue) was obtained under irrigation application using 1.2 and 0.8 of etc, respectively, with fertigation application in 80% of application time in both growing seasons. the calibration of cropsyst model confirmed that the model is able to mimic the growth of wheat and predicted grain, biological yield, and wue with high degree of accuracy. the highest yield reduction and the lowest wue under the tested climate change scenarios were obtained from farmer irrigation. it can be concluded that irrigating wheat grown in sandy soil with an amount of either 1.0 or 0.8 of etc with fertigation application in 80% of application time is recommended to enhance growth and yield, and to reduce wheat's damage caused by extreme climate change.
Evidencias de metasomatismo en el manto sublitosférico de Patagonia Evidences of metasomatism in the sublitospheric mantle of Patagonia
P.A. Aliani,E.A. Bjerg,T. Ntaflos
Revista de la Asociación Geológica Argentina , 2004,
Abstract: Los xenolitos ultramáficos recolectados en la Estancia Poklepovic, provincia de Santa Cruz, comprenden lherzolitas, harzburgitas y wehrlitas y se encuentran alojados en lavas alcalinas y conos cineríticos. La mayoría de los xenolitos contienen vidrio en venillas y/o bolsillos de fundido y la gran mayoría comprende además anfíbol, mica o ambas. El metasomatismo crítptico se manifiesta por el enriquecimento en tierras raras livianas en los análisis de roca total en muestras sin fases minerales hidratadas, bolsillos de fundido, ni venillas con vidrio. El metasomatismo modal es evidente en muestras con fases minerales hidratadas, bolsillos de fundido o venillas con vidrio y se refleja en la química de roca total, que muestra concentraciones elevadas de los elementos incompatibles. Las relaciones texturales permiten considerar al menos dos eventos metasomáticos claramente diferenciables. El primero produce la cristalización de anfíbol y mica y el otro es responsable del desarrollo de los bolsillos de fundido. La presencia de venillas con vidrio (± carbonato) en muestras en las que no se han identificado bolsillos de fundido sugiere que las mismas podrían ser el resultado de un evento metasomático distinto. Las evidencias texturales indican que al menos parte del carbonato presente en estos xenolitos precipitó a partir de aguas meteóricas ricas en carbonato. Ultramafic xenoliths from Estancia Poklepovic, Santa Cruz province, comprise lherzolites, harzburgites and wehrlites, hosted by alkaline lavas and cinder cones. Most of the samples carry glass veins and/or melt pockets and most of them also bear amphibol, mica or both. Criptic metasomatism is demonstrated by enrichment of light rare earth elements in bulk rock analyses of samples devoid of hydrous phases, melt pockets and glass veins. Modal metasomatism is evident in samples carrying hydrous phases, melt pockets and glass veins, which led to high contents of incompatible elements in bulk rock analyses. Textural evidences suggest that two metasomatic events affected this part of the mantle. One event allowed the crystallization of amphibol and mica, and the second is responsible for the melt pockets. The presence of glass veins (± carbonate) in samples devoid of melt pockets may be the result of a different metasomatic episode. Textural evidences demonstrate that at least part of the carbonate was precipitated by carbonate-rich meteoric water.
Alleviation of temperature stress by nutrient management in crop plants: a review
E.A Waraich,R Ahmad,A Halim,T Aziz
Journal of Soil Science and Plant Nutrition , 2012,
Abstract: The effect of fertigation regimes on wheat grown in sandy soil was tested in two field experiments in Egypt. The aim of the study was to determine the vulnerability of wheat to extreme weather event under climate change scenarios. Eight fertigation treatments, in addition to farmer irrigation were tested. Two climate change scenarios obtained from Hadley climate change model were incorporated in CropSyst model to assess wheat yield responses to fertigation regimes under these scenarios. The results showed that the highest yield and the highest water use efficiency (WUE) was obtained under irrigation application using 1.2 and 0.8 of Etc, respectively, with fertigation application in 80% of application time in both growing seasons. The calibration of CropSyst model confirmed that the model is able to mimic the growth of wheat and predicted grain, biological yield, and WUE with high degree of accuracy. The highest yield reduction and the lowest WUE under the tested climate change scenarios were obtained from farmer irrigation. It can be concluded that irrigating wheat grown in sandy soil with an amount of either 1.0 or 0.8 of ETc with fertigation application in 80% of application time is recommended to enhance growth and yield, and to reduce wheat's damage caused by extreme climate change.
Participa??o de estudantes de medicina como avaliadores em exame estruturado de habilidades clínicas (Osce)
Amaral, Fernando T. V.;Troncon, Luiz E.A.;
Revista Brasileira de Educa??o Médica , 2007, DOI: 10.1590/S0100-55022007000100011
Abstract: two educational experiments developed to verify if senior medical students could act as examiners in an osce of basic clinical skills are described. in the first experience, 6 interns and 6 staff members assessed 59 students from the traditional curriculum in a 6-station osce structured to assess medical history, physical examination and communication skills. the scores attributed by the staff members were higher than that of the students in all but the communication skill station. however, no significant difference was found among scores except in one physical examination station (p < 0,001) (wilcoxon test). in the second experience, 15 interns from the traditional curriculum and 9 staff members assessed 58 pbl curriculum students in a 3-station osce to assess clinical history, physical examination and manipulation of sterilized gloves. the students were paired to the staff members and an independent assessment was done using the same protocol. in 50% of the stations the mean scores attributed by the staff members and students were significantly different. this fact however was apparently due to a significant variability among the staff members' scores, what did not occur in the students' scores (p < 0,05) (wilcoxon test, anova - turkey, dunn). we conclude stating that senior students can be used as reliable examiners in a clinical skills osce for junior students. the variability in the scores attributed by the students for the same task seems to be inferior than it is in the scores attributed by the staff members.
Thin Layer Drying Kinetics of Solar-Dried Amaranthus hybridus and Xanthosoma sagittifolium Leaves
P.T. Akonor,E.A. Amankwah
Journal of Food Technology , 2013, DOI: 10.3923/jftech.2012.92.96
Abstract: The aim of the study was to model the solar drying characteristics of the leaves of Amaranthus hybridus and Xanthosoma sagittifolium dried in thin layers. Fresh leaves were obtained from Centre for Biodiversity Utilisation and Development (CBUD) farms, trimmed into strips of 0.3x3 cm and loaded into cabinet solar dryers up to a 5 mm layer. Drying was monitored and moisture loss determined by loss in weight of samples at hourly interval. Drying data were fitted to five thin layer models, namely; Newton s, Page s, Modified Page, Handerson and Pabis and Logarithmic Models by Non-linear Regression Analysis, the effective diffusivity was also determined for the two leafy vegetables. All five models showed a good fit between observed and predicted values with Page s Model resulting in the highest r2 and lowest RMSE and χ2 and hence the best model to describe the solar-drying characteristics of the two vegetables.
Concentrations of Heavy Metals in Leaves along Roadsides in Port Harcourt, Rivers State, Nigeria
E.A. Emerhi,T.J.K. Ideriah
Environmental Research Journal , 2012, DOI: 10.3923/erj.2012.114.120
Abstract: The concentrations of Cd, Cr, Cu, Ni and Pb in leaves collected along roadsides in Port Harcourt and environs were determined using GBC Avanta flame atomic absorption spectrophotometer Version 2.02. The metal concentrations in both seasons ranged from 0.001-19.530 Cr, 0.320-2.320 Ni, 0.118-1.150 Cd, 0.001-30.230 Pb and 0.386-3.850 ppm Cu. The difference between the dry and rainy seasons concentrations were significant (p<0.05). The concentrations of metals from high activity areas were higher than the concentrations from medium and low activity areas. The leaves were considered polluted as the concentrations of the metals except Ni exceeded permissible limits set by Rivers State Ministry of Environment. The levels of activity, ages and height of plant leaves influenced the concentrations of metals. Leaves should be properly treated before use for cooking and herbal or medicinal purposes.
Cassava/Maize Intercrop Performance and Soil Nutrient Changes with Fertilizers
O.T. Ayoola,E.A. Makinde
Journal of Agricultural Science , 2011, DOI: 10.5539/jas.v3n4p136
Abstract: Field trials were conducted in the forest vegetation (Ibadan) and the derived savannah (Ilora) zones of south west Nigeria to assess the yield performance of cassava/maize intercrop and soil nutrient changes with sole and some combined ratios of organic-based fertilizer (OBF) and inorganic fertilizer. Sole OBF was assessed at 2.5; 5.0 and 10.0 t ha-1 while 400 kg ha-1 NPK 15-15-15 served as the sole inorganic fertilizer treatment. The combined treatments were: 2.5 t ha-1 OBF + 100 kg ha-1 NPK 15-15-15 and 5 t ha-1 OBF + 100 kg ha-1 NPK 15-15-15. An unfertilized treatment served as the control treatment. Maize grain yield was highest with application of 5 t ha-1 OBF + 100 kg ha-1 NPK. It gave a mean yield of 2.45 t ha -1 at Ibadan and 2.49 t ha-1 at Ilora. Cassava root yield was however highest with 10 t ha-1 OBF. It gave a mean yield of 14.55 t ha-1 at Ibadan and 12.52 t ha-1 at Ilora. Soil N, P, K and Organic C was most increased with 10 t ha-1 OBF and 5 t ha-1 OBF+NPK. Crop yields and soil nutrient status decreased with no fertilizer application. Cassava –maize intercrop gives optimum yields and highest soil N, P, K increase with 10 t ha-1 OBF.
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