Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 20.073
Primeira ... 123456789 ... Última
Imagem não selecionada

Imprime registro no formato completo
A comparative analysis of the technical efficiency of rain-fed and smallholder irrigation in Ethiopia AgEcon
Makambe, Godswill; Namara, Regassa E.; Hagos, Fitsum; Awulachew, Seleshi Bekele; Ayana, Mekonnen; Bossio, Deborah A..
Agriculture is the most significant contributor to Ethiopia’s economy. Most of the agricultural production is under rainfed conditions and thus extremely sensitive to rainfall variability. Irrigation development, including smallholder irrigation, is used by the Ethiopian Government to attempt to mitigate the effects of rainfall variability. In this study, we look at smallholder irrigation - modern and traditional irrigation systems. A detailed description of the cropping patterns is given. The stochastic frontier production function approach is used to estimate technical inefficiency, and constraints to production are analyzed. Since the traditional system is found to be efficient but on a lower production frontier, the study shows that significant gains...
Tipo: Working or Discussion Paper Palavras-chave: Rainfed farming; Irrigated farming; Efficiency; Irrigation schemes; Small scale systems; Cropping patterns; Crop production; Economic aspects; Statistical analysis; Agricultural and Food Policy; Crop Production/Industries; Production Economics.
Ano: 2011 URL: http://purl.umn.edu/118298
Imagem não selecionada

Imprime registro no formato completo
A comparative chemical and pharmacological study of standardized extracts and vanillic acid from wild and cultivated Amburana cearensis A. C. Smith. Repositório Alice
LEAL, L. K. A. M.; PIERDONÁ, T. M.; GÓES, J. G. S.; CANUTO, K. M.; SILVEIRA, E. R.; BEZERRA, A. M. E.; VIANA, G. S. B..
The objectives of this work were to carry out a comparative chemical study and to evaluate the antinociceptive and anti-inflammatory activities of ethanol extracts (EtOHE) and vanilic acid (VA) from cultivated and wild Amburana cearensis A.C. Smith (Fabaceae), an endangered species used in Northeast Brazil for the treatment of asthma. The HPLC analysis of EtOHE, showed that coumarin (CM) and VA were the major constituents from the cultivated plant, while in the extract from the wild plant the major constituents were amburoside A (AMB) and CM. Pharmacological tests were performed with male Swiss mice or male Wistar rats acutely administered with 100?400 mg/kg, p.o. of EtOHEs or 12.5?50 mg/kg, p.o. of VA. EtOHEs from A. cearensis with 4, 7 or 9 months of...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Amburana cearensis; Vanillic acid; HPLC; Antinociceptive activity; Anti-inflammatory activity.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/904909
Imagem não selecionada

Imprime registro no formato completo
A comparative cost-effectiveness analysis of biodiversity indicators in grassland farming systems AgEcon
Targetti, Stefano; Viaggi, Davide; Cuming, David.
Tipo: Conference Paper or Presentation Palavras-chave: Farm Management; Resource /Energy Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/116077
Imagem não selecionada

Imprime registro no formato completo
A comparative study of clinical manifestations, haematological and serological responses after experimental infection with Anaplasma phagocytophilum in two Norwegian sheep breeds Organic Eprints
Stuen, Snorre; Grøva, Lise; Granquist, Erik G; Sandstedt, Karin; Olesen, Ingrid; Steinshamn, Håvard.
Background: It has been questioned if the old native Norwegian sheep breed, Old Norse Sheep (also called Norwegian Feral Sheep), normally distributed on coastal areas where ticks are abundant, is more protected against tick-borne infections than other Norwegian breeds due to a continuously high selection pressure on pasture. The aim of the present study was to test this hypothesis in an experimental infection study. Methods: Five-months-old lambs of two Norwegian sheep breeds, Norwegian White (NW) sheep and Old Norse (ON) sheep, were experimentally infected with a 16S rRNA genetic variant of Anaplasma phagocytophilum (similar to GenBank accession number M73220). The experiment was repeated for two subsequent years, 2008 and 2009, with the use of 16...
Tipo: Journal paper Palavras-chave: Sheep and goats; Health and welfare.
Ano: 2011 URL: http://orgprints.org/19867/1/PAPER_III.pdf
Imagem não selecionada

Imprime registro no formato completo
A comparative study of tocopherols composition and antioxidant properties of in vivo and in vitro ectomycorrhizal fungi IPB - Escola Superior Agrária
Reis, Filipa S.; Ferreira, Isabel C.F.R.; Barros, Lillian; Martins, Anabela.
In aerobic organisms, the free radicals are constantly being produced during the normal cellular metabolism. The antioxidant properties of many organisms and particularly of wild mushrooms with their content in antioxidant compounds such as tocopherols, can detoxify potentially damaging forms of activated oxygen. Herein, a comparative study of tocopherols composition and antioxidant properties of in vivo (fruiting bodies) and in vitro (mycelia) ectomycorrhizal fungi: Paxillus involutus and Pisolithus arhizus. Tocopherols were determined by high performance liquid chromatography (HPLC) coupled to a fluorescence detector. The antioxidant properties were studied in terms of DPPH radical-scavenging activity, reducing power and inhibition of β-carotene...
Tipo: Article Palavras-chave: Paxillus involutus; Pisolithus arhizus; Fruiting bodies/mycelia; Tocopherols; HPLC-fluorescence; Antioxidant activity.
Ano: 2011 URL: http://hdl.handle.net/10198/3880
Imagem não selecionada

Imprime registro no formato completo
A comparative study on the production of ethanol from lignocellulosic biomass by chemical and biological method Nature Precedings
Shaheed SM; Rohit JP; Madhan R; Selvakumar K.
Ethanol derived from non-edible biomass is renewable and a clean source of energy. It is independent of the food industry and it is economically feasible. The first generation biofuel or bioethanol is still not a very convenient source of energy as it prominently depends on the availability of grains. The main objective of this work is to develop an industrious efficient process to produce ethanol from lignocellulosic biomasses like wood and leaf in a lab scale. Two processes were compared. The first process involved an alkaline pre-treatment of the powdered biomass followed by dilute acid hydrolysis. The second process involved an alkaline treatment followed by direct hydrolysis of the biomass by use of a fungal species obtained from rotting wood....
Tipo: Manuscript Palavras-chave: Biotechnology.
Ano: 2011 URL: http://precedings.nature.com/documents/6579/version/1
Imagem não selecionada

Imprime registro no formato completo
A Comparison of Auction and Choice Experiment: An Application to Consumer Willingness to Pay for Rice with Improved Storage Management AgEcon
Su, Lianfan; Adam, Brian D.; Lusk, Jayson L.; Arthur, Frank.
Experimental auction and discrete choice experiment are two popular value elicitation methods. Theoretically they should yield the same results but empirical results have been mixed (e.g., Lusk and Schroeder 2004, 2006; Corrigan et al. 2010.) This study uses both methods to determine consumers’ willingness to pay (WTP) for rice with improved insect control and for rice stored using Integrated Pest Management (IPM). This study investigates two potential reasons – anchoring and information – for why some studies have found apparent inconsistencies between auction and choice experiment results. Results indicate that consumers’ WTP derived in the auction and choice experiments are significantly different. Consumers’ average bids in the auction are higher than...
Tipo: Conference Paper or Presentation Palavras-chave: 2nd price auction; Choice experiment; Price level; Information; Consumer/Household Economics; Crop Production/Industries.
Ano: 2011 URL: http://purl.umn.edu/103975
Imagem não selecionada

Imprime registro no formato completo
A Comparison of Imputation Methods under Large Samples and Different Censoring Levels (PowerPoint) AgEcon
Lopez, Jose Antonio.
PowerPoint Presentation
Tipo: Conference Paper or Presentation Palavras-chave: Imputation methods; Multiple imputation; Censored prices; Protein demand; Elasticities; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; Research Methods/ Statistical Methods; C81; Q11; R21.
Ano: 2011 URL: http://purl.umn.edu/109894
Imagem não selecionada

Imprime registro no formato completo
A comparison of Indonesian and Vietnamese approaches to agriculture in the ASEAN-China FTA AgEcon
Vanzetti, David; Setyoko, Nur Rakhman; Ngoc Que, Nguyen; Trewin, Ray.
Both Indonesia and Vietnam, as members of ASEAN, have negotiated a free trade agreement with China (ACFTA). ASEAN Member States can independently negotiate their tariff reductions. Both countries are generally aware of the opportunities access to the large Chinese market may present, but both are concerned to differing degrees about being flooded with Chinese imports, including agricultural products. As the time for implementation approaches, Indonesia has expressed a desire to renegotiate its tariff reduction schedules to protect sensitive sectors, including agriculture. By contrast, Vietnam, just over the border from China and with a history of informal trade, seems more accepting of the prospects. A global general equilibrium model, GTAP, is used to...
Tipo: Conference Paper or Presentation Palavras-chave: International Relations/Trade.
Ano: 2011 URL: http://purl.umn.edu/101002
Imagem não selecionada

Imprime registro no formato completo
A comparison of multisensor integration methods for land cover classification in the Brazilian Amazon. Repositório Alice
LU, D.; LI, G.; MORAN, E.; DUTRA, L.; BATISTELLA, M..
Many data fusion methods are available, but it is poorly understood which fusion method is suitable for integrating Landsat Thematic Mapper (TM) and radar data for land cover classification. This research explores the integration of Landsat TM and radar images (i.e., ALOS PALSAR L-band and RADARSAT-2 C-band) for land cover classification in a moist tropical region of the Brazilian Amazon. Different data fusion methods?principal component analysis (PCA), wavelet-merging technique (Wavelet), high-pass filter resolution-merging (HPF), and normalized multiplication (NMM)?were explored. Land cover classification was conducted with maximum likelihood classification based on different scenarios. This research indicates that individual radar data yield much poorer...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Landsat Thematic Mapper; Wavelet multisensor.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/902113
Imagem não selecionada

Imprime registro no formato completo
A comparison of paraffin and resin-based techniques used in bark anatomy Naturalis
Hamann, T.; Smets, E.; Lens, F..
Bark anatomy is an unappreciated discipline in plant systematics, despite its great potential to reveal systematically informative features. In this paper, main reasons for the lack of detailed bark anatomical data in many plant families are identified, including problems with sectioning, terminological issues, and difficulties in observation of dilated stems. We deal with these problems by focusing on two aspects: (1) compare, discuss and improve existing sectioning and maceration techniques using two species with soft and hard bark tissues; and (2) discuss the best way to collect stem bark samples. We hope that this paper will stimulate inclusion of bark anatomical data in future systematic studies.
Tipo: Article / Letter to the editor Palavras-chave: Bark anatomy; Light microscopy; Macerations; Plant systematics; Phloem; Sectioning; 42.54.
Ano: 2011 URL: http://www.repository.naturalis.nl/record/421834
Imagem não selecionada

Imprime registro no formato completo
A Comparison of Price Imputation Methods under Large Samples and Different Levels of Censoring. AgEcon
Lopez, Jose Antonio.
Research paper
Tipo: Conference Paper or Presentation Palavras-chave: Consumer/Household Economics; Demand and Price Analysis; Research Methods/ Statistical Methods; Imputation methods; Multiple imputation; Censored prices; Protein demand; Elasticities.
Ano: 2011 URL: http://purl.umn.edu/104498
Imagem não selecionada

Imprime registro no formato completo
A comparison of soil and water properties in organic and conventional farming systems in England Organic Eprints
Hathaway-Jenkins, L. J.; Sakrabani, R; Pearce, Bruce; Whitmore, A. P; Godwin, R. J..
Organic farming and improvements to agricultural sustainability are often seen as synonymous. However, an extensive European review demonstrated that in practice this is not always true. This study aims to compare the status of soil and water properties between separate fields managed in either an organic or a conventional manner. Soil samples were collected from 16 pairs of farms, throughout England, with both arable and grass fields within each pair on similar soil type. Chemical (nutrients, pesticides, herbicides) and physical (aggregate stability, field capacity, shear strength, soil organic matter, infiltration rates) soil properties were measured in four main soil texture classes in organic and conventional fields. The physical soil properties varied...
Tipo: Journal paper Palavras-chave: Soil quality.
Ano: 2011 URL: http://orgprints.org/18705/1/Hathaway_Jenkins_2011_SUM_paper.pdf
Imagem não selecionada

Imprime registro no formato completo
A comparison of the economic and environmental performances of conventional and organic farming: evidence from financial statements AgEcon
Argiles, Josep M.; Brown, Nestor Duch.
While conventional farming systems face serious problems of sustainability, organic agriculture is seen as a more environmentally friendly system since it favours renewable resources, recycles nutrients, uses the environment’s own systems for controlling pests and diseases, sustains ecosystems, protects soils, and reduces pollution. At the same time organic farming promotes animal welfare, the use of natural foodstuffs, product diversity and the avoidance of waste, among other practices. However, the future of organic agriculture will depend on its economic viability and on the determination shown by governments to protect these practices. This paper performs panel regressions with a sample of Catalan farms (Spain) to test the influence of organic farming...
Tipo: Article Palavras-chave: Organic farming; Conventional farming; Social/environmental/financial performance; Social and environmental accounting; Agribusiness; Environmental Economics and Policy; Farm Management; Q01; Q12; Q51; M41.
Ano: 2011 URL: http://purl.umn.edu/118577
Imagem não selecionada

Imprime registro no formato completo
A Comparison of the Great Mississippi River Floods of 1993 and 2011: Implications for Crop Insurance and Reinsurance AgEcon
Vergara, Oscar.
The flooding situation in 2011 is similar in nature to the Great Mississippi Flood of 1993, but different in the particulars. First, the timing of the flood within the growing season is different. Second, the two floods occurred in different regions, with the 1993 flood affecting a portion of the Corn Belt and the 2011 flood affecting a region farther south. While floodwaters have inundated several million acres of cropland in 2011, yield losses from delayed planting are expected to be limited. Furthermore, the affected states from the current flood are primarily Group 2 states under the current SRA, which are provided with greater reinsurance protection by the government than the Group 1 states.
Tipo: Report Palavras-chave: Great Mississippi Flood; 1993; 2011; SRA; Crop Insurance Losses; AIR Model; Crop Production/Industries; Risk and Uncertainty; C; Q.
Ano: 2011 URL: http://purl.umn.edu/104897
Imagem não selecionada

Imprime registro no formato completo
A Competing Risks Model of Land Use Change AgEcon
Towe, Charles A..
Tipo: Conference Paper or Presentation Palavras-chave: Dependent competing risks; Land conversion; Real options; Hazard models; Preservation easements; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/103725
Imagem não selecionada

Imprime registro no formato completo
A Complex Variation of the Parietal and Visceral Branches of the Abdominal Aorta International Journal of Morphology
Unver Dogan,Nadire; Fazliogullari,Zeliha; Yilmaz,Mehmet Tugrul; Uysal,Ismihan Ilknur; Cicekcibasi,Aynur Emine; Ulusoy,Mahinur; Gunaslan,Pervin.
Variations in the branches of the abdominal aorta were determined during a routine abdominal region dissection of a 70-year-old male cadaver. Left gastric artery arose as the first root from antero-lateral of aorta. Coeliacomesenteric trunk occurred as a thick root. After 29.9mm, coeliacomesenteric trunk bifurcated as coeliac trunk and superior mesenteric artery. Coeliac trunk bifurcated as splenic artery and common hepatic artery. These multiple variations which change the normal anatomic structure of the abdominal aorta have to be kept in mind by surgeons, radiologists and anatomists.
Tipo: Journal article Palavras-chave: Abdominal aorta; Coeliacomesenteric trunk; Anatomical variation.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100015
Imagem não selecionada

Imprime registro no formato completo
A Composite Fuzzy Indicator for Assessing Farm Household Potential for Non-farm Income Diversification AgEcon
Fritzsch, Jana.
European politicians encourage the income diversification of rural households through various measures. Although being aware of farm households’ potential for non-farm income diversification seems important for finely-targeting such policy measures, no attempt has thus far been made to summarise the various determinants of income diversification in a single figure. This contribution aims to close this gap. A composite fuzzy indicator that measures farm household potential for non-farm income diversification is developed and applied to 1,053 farm households in Bulgaria, Hungary, Poland, Romania, and Slovenia. The indicator summarises the incentives of and capacities for non-farm income diversification on the individual household member level, and on the...
Tipo: Conference Paper or Presentation Palavras-chave: Composite indicator; Fuzzy logic; Rural non-farm income diversification; Transition countries; Consumer/Household Economics; C65; J24; Q12; R23.
Ano: 2011 URL: http://purl.umn.edu/114349
Imagem não selecionada

Imprime registro no formato completo
A Compound produced by fruigivorous Tephritidae (Diptera) larvae promotes oviposition behavior by the biological control agent Diachasmimorpha longicaudata (Hymenoptera: Braconidae). Repositório Alice
STUHL, C.; SIVINSKI, J.; TEAL, P.; PARANHOS, B. A. J.; ALUJA, M..
2011
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Diachasmimorpha longicaudata; Bactrocera; Anastrepha; Ceratitis; Para-ethylacetophenone.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/909060
Imagem não selecionada

Imprime registro no formato completo
A Comprehensive Approach to Building North Carolina's Local Food Economy From Farm to Fork (PowerPoint) AgEcon
Creamer, Nancy.
Tipo: Conference Paper or Presentation Palavras-chave: Agribusiness.
Ano: 2011 URL: http://purl.umn.edu/106144
Registros recuperados: 20.073
Primeira ... 123456789 ... 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

Valid HTML 4.01 Transitional