Effect of increased dietary protein level in meagre (Argyrosomus regius) juvenile growth and muscle cellularity          下载免费PDF全文

M. Saavedra  T.G. Pereira  A. Candeias‐Mendes  L. Carvalho  P. Pousão‐Ferreira  L.E.C. Conceição 《Aquaculture Nutrition》2018,24(3):1153-1159

In this study, two different dietary protein levels were tested (500 and 600 g/kg) in meagre juveniles of approximately 2 g, to determine whether a higher body protein diet would favour muscle growth. Results showed that meagre survival and growth were not affected by different levels of dietary protein. However, a higher content of protein was observed in the body composition of meagre fed the P60 diet (656 g/kg versus 624 g/kg). When fish were 82 days after hatched (DAH), protein retention efficiency was significantly higher in fish that were fed the P50 diet (37.1% versus 32.5%). Muscle cellularity changed considerably from the beginning to the end of the trial. The contribution of fibre hyperplasia to muscle growth was reduced although still accounted for 30% in 96 DAH meagre. Several differences were found in the frequency of fibres with areas between 1,000 μm² and 2,200 μm² between younger and older meagre, but no effect was found associated with dietary protein. This study suggests that neither growth nor muscle cellularity of fast‐growing juvenile meagre is positively affected by an increased dietary protein levels.  相似文献   

Growth of intact plants and coppice in short rotation eucalypt plantations     

Felippe Coelho de Souza  Geraldo Gonçalves dos Reis  Maria das Graças Ferreira Reis  Helio Garcia Leite  Ronan Soares de Faria  Jônio Pizzol Caliman  Rodolfo Alves Barbosa  Carlos Henrique Rodrigues de Oliveira 《New Forests》2016,47(2):195-208

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Effect of the integrated livestock–forest system on recovery of trichostrongylid nematode infective larvae from sheep     

Eduardo Ferreira Faria  Luciano Bastos Lopes  Daniela dos Reis Krambeck  Douglas dos Santos Pina  Artur Kanadani Campos 《Agroforestry Systems》2016,90(2):305-311

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Humic Substances on Soybeans Grown Under Water Stress     

Marcelo Ribeiro Vilela Prado  Oscarlina Lúcia dos Santos Weber  Milton Ferreira de Moraes  Carlos Leandro Rodrigues dos Santos  Morgana Santos Tunes  Fabricio Tomaz Ramos 《Communications in Soil Science and Plant Analysis》2016,47(21):2405-2413

Hypothetically, humic substances (HSs) can improve the response of plants in sandy soils. The objective was to assess the effect of applying an organomineral fertilizer enriched with HSs on soybean plants grown with and without water stress. The experimental design was entirely randomized, in a greenhouse, in a 2 × 5 factorial setup (two moisture levels and five fertilizer doses: 0, 1, 2, 4, and 8 mL dm^?3), for a total of 10 treatments, with eight repetitions, using as substrate a Psamment. The organomineral fertilizer was applied in the soil 21 days after plant emergence, and the water regimes were established 1 week thereafter. Plant height, shoot and root dry mass, mineral nutrition, and grain yield were evaluated. There was a positive response to the doses, with the most efficient one under water stress being 6.5 mL dm^?3 and HSs favored the uptake of micronutrients.  相似文献   

Copper Biogeochemistry in Response to Rhizosphere Soil Processes Under Four Native Plant Species Growing Spontaneously in an Abandoned Mine Site in NE Brazil     

Fabio Perlatti  Tiago Osório Ferreira  Lucas R. Sartor  Xosé Luis Otero 《Water, air, and soil pollution》2016,227(5):142

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Molecular characterization of accessions of a rare genetic resource: sugary cassava (Manihot esculenta Crantz) from Brazilian Amazon     

Elisa Ferreira Moura  Nelcimar Reis Sousa  Mônika Fecury Moura  Miguel Costa Dias  Everton Diel Souza  João Tomé de Farias Neto  José Edson Sampaio 《Genetic Resources and Crop Evolution》2016,63(4):583-593

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Digestive enzyme activity in juvenile Nile tilapia (Oreochromis niloticus, L) submitted to different dietary levels of shrimp protein hydrolysate     

Juliana Ferreira Santos  Patrícia Fernandes Castro  Albino Luciani Gonçalves Leal  Augusto Cézar Vasconcelos de Freitas Júnior  Daniel Lemos  Luiz Bezerra Carvalho Jr.  Ranilson Souza Bezerra 《Aquaculture International》2013,21(3):563-577

The effect of different dietary concentrations of shrimp protein hydrolysate (SPH) on digestive enzyme activity of Nile tilapia juveniles was evaluated. SPH concentrations in diets were 0, 15, 30 and 60 g kg^?1 (treatments SPH0, SPH15, SPH30 and SPH60, respectively). Hemoglobin, azocasein, BApNA (Nα-benzoyl-dl-arginine-p-nitroanilide), SApNA (Suc-Ala-Ala-Pro-Phe p-nitroanilide), aminoacyl of β-naphthylamide and starch were used as substrates for enzyme activity determinations. The activity of total alkaline protease was significantly higher (P < 0.05) in fish under SPH15 and SPH60 treatments than in the control (SPH0). However, the effect was not dose-dependent. Substrate-SDS-PAGE was also performed to evaluate changes in the profile of Nile tilapia digestive proteases caused by SPH. Substrate-SDS-PAGE revealed 12 active proteolytic bands, eight of which responded to SPH dietary incorporation. Inhibition substrate-SDS-PAGE indicated a decrease in the activity of three enzymes, with trypsin activity decreasing with the increase of SPH concentration, whereas the opposite occurred for two aminopeptidases. Distinct protease profiles were also found for each treatment, suggesting adaptability of digestive proteases from Nile tilapia to the different diets.  相似文献   

Characterization and Quantification of Phenolic Compounds in Four Tomato (Lycopersicon esculentum L.) Farmers’ Varieties in Northeastern Portugal Homegardens     

Lillian Barros  Montserrat Due?as  José Pinela  Ana Maria Carvalho  Celestino Santos Buelga  Isabel C. F. R. Ferreira 《Plant foods for human nutrition (Dordrecht, Netherlands)》2012,67(3):229-234

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Fatigue performance of Kevlar/epoxy composites with filled matrix by cork powder     

P. N. B. Reis  J. A. M. Ferreira  J. D. M. Costa  M. J. Santos 《Fibers and Polymers》2012,13(10):1292-1299

The objective of this study is to characterize the fatigue strength of a Kevlar/epoxy laminate composite as well as the benefits obtained by using an epoxy matrix filled by cork powder. Twelve ply laminates, all in the same direction, of woven bi-directional Kevlar 292, were prepared by hand lay-up, using an SR 1500 epoxy resin. The composite sheets were produced by a vacuum moulding process. The addition of cork powder reduces the static strength, however, in terms of fatigue strength a similar behavior was found for both laminates.  相似文献   

Plant and animal endemism in the eastern Andean slope: challenges to conservation     

Jennifer J Swenson  Bruce E Young  Stephan Beck  Pat Comer  Jesús H Córdova  Jessica Dyson  Dirk Embert  Filomeno Encarnación  Wanderley Ferreira  Irma Franke  Dennis Grossman  Pilar Hernandez  Sebastian K Herzog  Carmen Josse  Gonzalo Navarro  Víctor Pacheco  Bruce A Stein  Martín Timaná  Antonio Tovar  Carolina Tovar  Julieta Vargas  Carlos M Zambrana-Torrelio 《BMC ecology》2012,12(1):1-19

Background

The Andes-Amazon basin of Peru and Bolivia is one of the most data-poor, biologically rich, and rapidly changing areas of the world. Conservation scientists agree that this area hosts extremely high endemism, perhaps the highest in the world, yet we know little about the geographic distributions of these species and ecosystems within country boundaries. To address this need, we have developed conservation data on endemic biodiversity (~800 species of birds, mammals, amphibians, and plants) and terrestrial ecological systems (~90; groups of vegetation communities resulting from the action of ecological processes, substrates, and/or environmental gradients) with which we conduct a fine scale conservation prioritization across the Amazon watershed of Peru and Bolivia. We modelled the geographic distributions of 435 endemic plants and all 347 endemic vertebrate species, from existing museum and herbaria specimens at a regional conservation practitioner's scale (1:250,000-1:1,000,000), based on the best available tools and geographic data. We mapped ecological systems, endemic species concentrations, and irreplaceable areas with respect to national level protected areas.

Results

We found that sizes of endemic species distributions ranged widely (< 20 km² to > 200,000 km²) across the study area. Bird and mammal endemic species richness was greatest within a narrow 2500-3000 m elevation band along the length of the Andes Mountains. Endemic amphibian richness was highest at 1000-1500 m elevation and concentrated in the southern half of the study area. Geographical distribution of plant endemism was highly taxon-dependent. Irreplaceable areas, defined as locations with the highest number of species with narrow ranges, overlapped slightly with areas of high endemism, yet generally exhibited unique patterns across the study area by species group. We found that many endemic species and ecological systems are lacking national-level protection; a third of endemic species have distributions completely outside of national protected areas. Protected areas cover only 20% of areas of high endemism and 20% of irreplaceable areas. Almost 40% of the 91 ecological systems are in serious need of protection (= < 2% of their ranges protected).

Conclusions

We identify for the first time, areas of high endemic species concentrations and high irreplaceability that have only been roughly indicated in the past at the continental scale. We conclude that new complementary protected areas are needed to safeguard these endemics and ecosystems. An expansion in protected areas will be challenged by geographically isolated micro-endemics, varied endemic patterns among taxa, increasing deforestation, resource extraction, and changes in climate. Relying on pre-existing collections, publically accessible datasets and tools, this working framework is exportable to other regions plagued by incomplete conservation data.  相似文献