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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Structure and regulation of stearoyl-ACP desaturase and metallothionein-like genes in developing fruits of the oil palm (Elaeis guineensis)

Abdullah, Siti Nor Akmar January 1999 (has links)
No description available.
2

Genetic diversity and oil quality of Guizotia Cass. (Asteraceae) /

Petros, Yohannes, January 2008 (has links) (PDF)
Diss. (sammanfattning) SLU, Alnarp : Sveriges lantbruksuniversitet, 2008. / Härtill 4 uppsatser.
3

Influência da água residuária da suinocultura sobre a acidez do óleo do pinhão manso (Jatropha curcas L.) / Effect of swine wastewater on Jatropha curcas L. oil acidity

Bastos, Rafaela Koglin 05 February 2016 (has links)
Made available in DSpace on 2017-07-10T15:14:36Z (GMT). No. of bitstreams: 1 _Rafaela_K_BASTOS.pdf: 1560970 bytes, checksum: ffc24518eabfdef76f8aff1be1e053ce (MD5) Previous issue date: 2016-02-05 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / The increased interest in biofuels in recent years, coupled with the problem of the need for environmental sanitation in different areas of the economy justify the proposal of this work, which is the reuse of wastewater from swine (SW) in the jatropha crop (Jatropha curcas L.) and its influence on oil acidity - short parameter importance in the production of biodiesel; culture stands out from oilseeds for its oil production capacity and high adaptability in different scenarios. The experiment featured a Jatropha plantation area of 900 m², which were used 216 m² for conducting the experiment, divided into eighteen installments, the research was conducted over three years; each year the plots received six treatments with different proportions of SW with three repetitions each, applications were performed in triplicate with an interval of three months between each application. Seed harvest was done by hand during the entire production plan period from the first application of each year, the oil was extracted with solvent (ethanol), justified because it is cheaper, less toxic and less harmful to the environment, when compared to other organic solvents such as hexane. The acidity was determined by titration process with sodium hydroxide (NaOH) at the end of each experimental cycle; further the composition was determined as the percentage of oils of fatty acids (FA) by gas chromatography. The results showed an inversely proportional reduction of acidity amount of SW applied during the three years analyzed; It was also observed a decrease in linolenic acid concentration due to the increase of the applied dose and in all cycles. Knowing FA unsaturated oils leave them more susceptible to oxidation, reduction FA that may be related to decreased acidity / O aumento do interesse por biocombustíveis nos últimos anos, somado à problemática da necessidade do saneamento ambiental em diferentes áreas da economia, justificam a proposta do presente trabalho, que é o reuso da água residuária da suinocultura (ARS) na cultura do pinhão manso (Jatropha curcas L.) e sua influência sobre a acidez do óleo - parâmetro de suma importância na produção de biodiesel; a cultura se destaca dentre as oleaginosas por sua capacidade de produção de óleo e a alta adaptabilidade em diferentes cenários. O experimento contou com uma área de plantio de pinhão manso de 900 m², da qual foram utilizados 216 m² para condução do experimento, divididos em dezoito parcelas, a pesquisa foi conduzida ao longo de três anos; em cada ano as parcelas receberam seis tratamentos com diferentes proporções de ARS com três repetições cada, as aplicações foram realizadas em triplicata com intervalo de três meses entre cada aplicação. A colheita das sementes foi feita manualmente durante todo o período produtivo da planta a partir da primeira aplicação de cada ano, o óleo foi extraído com solvente (etanol), justificado pelo fato de ser mais barato, menos tóxico e menos nocivo ao meio ambiente, quando comparado a outros solventes orgânicos, como o hexano. A acidez foi determinada pelo processo de titulação com hidróxido de sódio (NaOH) ao final de cada ciclo experimental; foi determinada ainda a composição dos óleos quanto a porcentagem de ácidos graxos (AG), por cromatografia gasosa. Os resultados mostraram uma redução da acidez inversamente proporcional a quantidade de ARS aplicada, nos três anos analisados; observou-se ainda um decréscimo na concentração do ácido linolênico em função do aumento das doses aplicadas e em todos os ciclos. Sabendo que AG insaturados deixam os óleos mais susceptíveis à oxidação, a redução desse AG pode estar relacionada à diminuição da acidez
4

Epidemiology and forecasting of Sclerotinia stem rot on spring sown oilseed rape in Sweden /

Twengström, Eva, January 1900 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv. / Härtill 4 uppsatser.
5

IMPROVEMENT OF NEW OIL CROPS FOR KENTUCKY

Jamboonsri, Watchareewan 01 January 2010 (has links)
Three oil crops, chia (Salvia hispanica L.), flax (Linum usitatissimum L.), and castor (Ricinus communis L.), were studied because of their nutritional and industrial values. Chia and flax are rich in an ω3 fatty acid, α-linolenic acid, and castor is a very high oil producer and high in a hydroxy fatty acid. Ethyl methanesulfonate (EMS) and gamma rays were employed to mutagenize chia seeds to produce early flowering mutants. The M1 population was grown and induced to flower by short-day photoperiods. The M2 population was planted in the field in Lexington, KY in 2008. Early flowering plants were found 55 days after planting while non-mutagenized plants did not produce any flower buds until the 7th of October, 82 days after planting, at a daylength of 11 hours and 32 minutes. 0.012% of the EMS-treated M2 population and 0.024% of the gamma radiation-treated population flowered much earlier than the controls. M3 early flowering mutant lines were able to flower at photoperiods of 12-15 hours in a greenhouse. Selected lines produced flower buds on the 7th of July, 47 days after planting, at a daylength of 14 hours and 41 minutes in the field in Lexington, Kentucky. Different varieties of flax were evaluated for seed yield and field performance in Kentucky. Plant height and yield data were collected from three growing seasons. Yields from 2006 trial varied from 368-1,267 kg/ha. Yields from 2007 and 2008 were much lower due to drought. The variety ‘Carter’ gave the highest yield every season. Flax can be grown in Kentucky but yields are low. Two high-yield castor varieties, ‘Carmencita’ and ‘TTU-LRC’, were crossed in greenhouse. The F1 population was grown in the field. Inflorescences were covered to ensure self-pollination. The F2 population showed a high degree of segregation for plant height, stem color, capsule color and seed yield in the following growing season. Data on plant height, number of branches, color, and yield was collected from 89 F2 individuals. Fifteen lines with the highest yield were selected to plant in the field in spring of 2009. New high-yield castor varieties are being developed for production in Kentucky.
6

Modified fatty acid composition in Brassica napus using transformation and somatic hybridisation /

Pontoppidan, Mia, January 1900 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv. / Härtill 4 uppsatser.
7

Monitoring and control of Plasmodiophora brassicae in spring oilseed brassica crops /

Wallenhammar, Ann-Charlotte, January 1900 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv. / Härtill 5 uppsatser.
8

Genotype analysis and studies of pyrethroid resistance of the oilseed rape (Brassica napus) insect pest - pollen beetle (Meligethes aeneus) /

Kazachkova, Nadiya, January 2007 (has links) (PDF)
Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniversitet, 2007. / Härtill 4 uppsatser.
9

Verticillium longisporum, infection, host range, prevalence and plant defence responses /

Johansson, Anna, January 2006 (has links) (PDF)
Licentiatavhandling Uppsala : Sveriges lantbruksuniversitet, 2006. / Härtill 3 uppsatser.
10

Agroenergia na mitigação das mudanças climáticas globais, na segurança energética e na promoção social / Agroenergy in the mitigation of global climatic changes, energy security and social movement

Ribeiro, Rita da Mata 27 August 2009 (has links)
Made available in DSpace on 2015-03-26T13:39:34Z (GMT). No. of bitstreams: 1 texto completo.pdf: 4547948 bytes, checksum: a4e6166dd7e07196209bfe8285680cb5 (MD5) Previous issue date: 2009-08-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Agroenergy has a strategic role in the mitigation of Greenhouse Effect Gases (GEG), in energy security and in social movements. Two equally important factors rekindle the world-wide interest for renewable energies sources, especially those originating from biomass: i) the current perspective of the depletion of non-renewable energy reserves and ii) the negative scenarios of global climatic changes (GCCs), caused by global warming. This last factor has a strong relation to burning fossil fuels, which accounts for 75 % of the GEG emissions, and with the current form of use and occupation of land, as reported by the Intergovernmental Panel on Climate Changes (IPCC). In this context, renewable energy alternatives are primary in confronting such challenges. The present work is sectioned into three chapters, each intimately connected. The first two were based on the exploratory research documentation. To do this parameters and information relative to the IPCC and its implications were used, especially on agriculture, and global agroenergy programs, such as the National Program of Production and Use of Biodiesel (PNPB). Biodiesel appears to be a promising alternative in the partial substitution of petro-derivatives and in the mitigation of GCCs, besides other advantages that qualify it in a favorable global scenario. The spread in the participation of biodiesel in a favorable world-wide energy matrix creates an opportunity to execute policies in the following areas: social (generation of jobs and income and the reduction of regional asymmetries), environmental (reduction of GEGs) and economical (import reductions of petrodiesel and exchange factor). Agrofuels represent an important instrument of development, especially for countries that signed the Kyoto Protocol agreement, in effect until 2012 and, in the future, the Copenhagen Protocol, which will be implemented after 2012. Among the producing countries, Brazil presents the greatest conditions to lead energy agriculture on a world-wide scale. The third chapter is based on a questionnaire answered by Biodiesel Production Factories (BPFs) in Brazil, after the introduction of the PNPB. The inquiry also was supported in secondary sources, such as books, maps and the web. The data of the National Agency of Oil, Natural gas and Biofuels (ANP) were used as parameters. The most used raw materials in the production of biodiesel in the country are soy (main), animal fat, and the cotton and castor seed, in this order, and with a great interest in the fisic nut. The methyl route is the most used, being adopted by 53 % of the BPFs in study. Within the premise of the PNPB, the Social Fuel Seal (SCS) is an important component to stimulate the introduction of the BPFs. The PNPB presents advancements like the insertion of biodiesel into the Brazilian energy matrix, generation of jobs, income and regional development, especially in the Northeast and in the semi-arid regions. However, there are still many challenges to be faced, like the subsidies and protectionism of the biodiesel production countries, especially the USA and EU. / A agroenergia tem papel estratégico na mitigação dos Gases de Efeito Estufa (GEE), na segurança energética e na promoção social. Dois fatores igualmente importantes reacendem o interesse mundial por fontes de energias renováveis, notadamente, aqueles provenientes da biomassa: i) a atual perspectiva de esgotamento das reservas energéticas não-renováveis e ii) os cenários negativos das mudanças climáticas globais (MCGs), causadas pelo aquecimento global. Este último fator tem forte relação com a queima de combustíveis fosséis, os quais respondem por 75% das emissões de GEE, e com a forma atual de uso e ocupação do solo, conforme reportado pelo Painel Intergovernamental sobre Mudanças do Clima (IPCC). Neste contexto, alternativas energéticas renováveis são primordiais para o enfrentamento de tais desafios. O presente trabalho está formatado em três capítulos, intimamente relacionados. Os dois primeiros basearam-se na pesquisa exploratória documental. Para tanto foram utilizados como parâmetros dados e informações relativas ao IPCC e suas implicações, notadamente sobre a agricultura, e dos programas globais de agroenergia, a exemplo do Programa Nacional de Produção e Uso de Biodiesel (PNPB). O biodiesel surge como alternativa promissora na substituição parcial dos petroderivados e na mitigação das MCGs, além de outras vantagens que o qualifica em um cenário favorável globalmente. A ampliação da participação do biodiesel na matriz energética mundial propicia a oportunidade de executar políticas nos âmbitos: social (geração de emprego e renda e redução das assimetrias regionais), ambiental (redução de GEE) e econômico (redução de importações de petrodiesel e fator de divisas). Os agrocombustíveis representam importante instrumento de desenvolvimento, especialmente para países signatários do acordo firmado pelo Protocolo de Quioto, vigente até 2012 e, futuramente, pelo Protocolo de Copenhague, a ser implementado após 2012. Dentre os países produtores, o Brasil apresenta maiores condições para liderar a agricultura de energia em escala mundial. O terceiro capítulo baseou-se em um questionário respondido por Usinas Produtoras de Biodiesel (UPBs) do Brasil, após a implantação do PNPB. A pesquisa também se apoiou em fontes secundárias, como livros, mapas e web. Os dados da Agência Nacional de Petróleo, Gás Natural e Biocombustíveis (ANP) foram utilizados como parâmetros. As matérias-primas mais utilizadas na produção de biodiesel no país são a soja (majoritariamente), a gordura animal, o caroço de algodão e a mamona, nessa ordem, e com grande interesse pelo pinhão-manso. A rota metílica é a mais utilizada, sendo adotada por 53% das UPBs em estudo. Dentro das premissas do PNPB, o Selo Combustível Social (SCS) é um componente importante como incentivador da implantação das UPBs. O PNPB apresenta avanços, como a inserção do biodiesel na matriz energética brasileira, geração de emprego, renda e desenvolvimento regional, notadamente no Nordeste e nas regiões semiáridas. Porém ainda apresenta muitos desafios a serem enfrentados, a exemplo dos subsídios e protecionismos dos países produtores de biodiesel, especialmente dos EUA e UE.

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