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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

Untersuchungen zum Metabolismus ungesättigter Fettsäuren unter besonderer Berücksichtigung der Bildung chiraler aliphatischer Lactone in Hefen /

Haffner, Thomas. January 1997 (has links) (PDF)
Techn. Univ., Diss.--Berlin, 1997.
2

Bioprodução de compostos voláteis e carotenóides por Sporidiobolus salmonicolar CBS2636

Valduga, Eunice January 2005 (has links)
Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia Química. / Made available in DSpace on 2013-07-16T00:55:33Z (GMT). No. of bitstreams: 1 224147.pdf: 3449136 bytes, checksum: ad60b26aef1b3582ceb87ab8b524a9ff (MD5)
3

Produkce lipolytických enzymů kvasinkami / Production of lipolytic enzymes by yeasts

Bradáčová, Kristína January 2018 (has links)
This diploma thesis is focused on controlled production of lipolytic enzymes, bioactive substances and lipids by carotenogenic yeasts. Theoretical part deals with characterization of lipolytic enzymes, carotenoids, lipids and their properties, possibility of production and application. In experimental part the enzymes, carotenoids and lipids were produced by red yeasts Rhodotorula mucilaginosa, Cystofilobasidium macerans and Sporidiobolus salmonicolor by submerged cultivation in mineral medium with different additions: glucose, glycerol, fat, fat with glucose, fat with polysorbate 80, fat with glycerol, fat with polyethylene glycol, fat with higher and lower addition of palmitic acid, enzymatic fat hydrolysate, acidic hydrolysate a basic hydrolysate. The activity of extracellular lipase was monitored in medium after 96-hour cultivation. Concentration of -carotene, total carotenoids, ergosterol and ubiquinone was determined by HPLC, concentration of fatty acids and amount of fat by GC. Production had differed depending on used yeasts and substrate. As the best producer of carotenoids Cystofilobasidium macerans was found, ergosterol was highly produced by Sporidiobolus salmonicolor. The production of ubiquinone was almost equivalent in all yeasts and lipolytic activity was the highest in Sporidiobolus salmonicolor. The patricular medium sample with high lipolytic activity was further separated and analysed by ultrafiltration and PAGE-SDS electrophoresis. This diploma thesis was done within the international project ,,LipoFungi“.
4

Variabilidade genética do fungo Erythricium salmonicolor, agente causal da rubelose dos citros / Genetic variability of fungus Erythricium salmonicolor, causal agent of pink disease of citrus

Souza, Fernanda Luiza de 12 April 2006 (has links)
A rubelose é uma doença que atinge galhos e ramos, e é causada pelo fungo Erythricium salmonicolor, o qual infecta várias espécies vegetais, tais como citros, seringueira, e macieira. Esta doença vem chamando a atenção dos citricultores devido à redução de até 10% da produção de citros, a qual é preocupante para o Brasil, o maior produtor de laranja do mundo. Entretanto, a diversidade do fungo E. salmonicolor em cultivares brasileiras ainda não foi avaliada. Desta maneira, este trabalho teve como objetivos: i) avaliar a variabilidade genética, por meio de RAPD, de isolados do fungo E. salmonicolor provenientes de diferentes regiões citrícolas de São Paulo e Minas Gerais, ii) avaliar a compatibilidade vegetativa e fusão de hifas deste fungo e iii) selecionar bactérias endofíticas com potencial para o controle deste fungo fitopatogênico. Após a análise por RAPD, foram observados 6 grupos distintos (A, B, C, D, E, F), os quais não apresentaram correlação com o local de origem e espécie hospedeira. No teste de compatibilidade vegetativa houve encontro de hifas em todos os cruzamentos e 84% destes apresentaram fusão entre as hifas. Foi verificada compatibilidade entre linhagens, embora não tenha sido observada correlação com os haplótipos. No teste de antagonismo, 8 isolados bacterianos inibiram E. salmonicolor. Entretanto, foi observada diferença na interação entre as bactérias e diferentes isolados de E. salmonicolor, visto que bactérias diferentes inibiram os dois genótipos do fungo, revelando a variabilidade genética entre estas linhagens que pertencem a diferentes haplótipos. Os resultados observados neste trabalho indicam a importância de futuros estudos sobre a fase sexual de E. salmonicolor, uma vez que a anastomose de hifas precede a formação de heterocário, responsável pelos processos de recombinações sexuais e parassexuais, que geram variabilidade genética em fungos filamentosos. / The fungus Erythricium salmonicolor is the causal agent of pink disease, which infects branches of many host plants, such as citrus, rubber, and apple. This disease may be a serious problem in Brazil, since it can reduce the citrus production up to 10%. Brazil is the major world citrus producer, therefore this problem is alarming. The genetic diversity of E. salmonicolor from Brazilian plants has not been evaluated, so the aims of this study were i) to evaluate the genetic diversity by RAPD of E. salmonicolor isolates from São Paulo and Minas Gerais; ii) to evaluate the vegetative compatibility and hyphal fusion of this fungus; and iii) to select endophytic bacteria able to inhibit the E. salmonicolor growth. RAPD analysis showed at least 6 distinct haplotypes (A, B, C, D, E, F), which did not have correlation with the isolation site and host plant. Also, vegetative compatibility tests showed that 84% of crosses resulted in hyphal fusion, but this compatibility was not related to the RAPD haplotypes. Eight endophytic bacteria were selected against E. salmonicolor, which could be used for biological control of this pathogen. However it was observed different types of interaction among endophytic bacteria and E. salmonicolor strains, since these bacteria inihibited differentially two fungi isolates. It reveals the genetic variability between these fungi isolates that belongs to different haplotypes These results show the importance of future studies concerning the sexual phase of E. salmonicolor, since the genetic variability seems to be high and this hyphal fusion, which precede the formation of heterokaryon (sexual and parassexual reproduction), could be responsible for the variability in this filamentous fungus.
5

Variabilidade genética do fungo Erythricium salmonicolor, agente causal da rubelose dos citros / Genetic variability of fungus Erythricium salmonicolor, causal agent of pink disease of citrus

Fernanda Luiza de Souza 12 April 2006 (has links)
A rubelose é uma doença que atinge galhos e ramos, e é causada pelo fungo Erythricium salmonicolor, o qual infecta várias espécies vegetais, tais como citros, seringueira, e macieira. Esta doença vem chamando a atenção dos citricultores devido à redução de até 10% da produção de citros, a qual é preocupante para o Brasil, o maior produtor de laranja do mundo. Entretanto, a diversidade do fungo E. salmonicolor em cultivares brasileiras ainda não foi avaliada. Desta maneira, este trabalho teve como objetivos: i) avaliar a variabilidade genética, por meio de RAPD, de isolados do fungo E. salmonicolor provenientes de diferentes regiões citrícolas de São Paulo e Minas Gerais, ii) avaliar a compatibilidade vegetativa e fusão de hifas deste fungo e iii) selecionar bactérias endofíticas com potencial para o controle deste fungo fitopatogênico. Após a análise por RAPD, foram observados 6 grupos distintos (A, B, C, D, E, F), os quais não apresentaram correlação com o local de origem e espécie hospedeira. No teste de compatibilidade vegetativa houve encontro de hifas em todos os cruzamentos e 84% destes apresentaram fusão entre as hifas. Foi verificada compatibilidade entre linhagens, embora não tenha sido observada correlação com os haplótipos. No teste de antagonismo, 8 isolados bacterianos inibiram E. salmonicolor. Entretanto, foi observada diferença na interação entre as bactérias e diferentes isolados de E. salmonicolor, visto que bactérias diferentes inibiram os dois genótipos do fungo, revelando a variabilidade genética entre estas linhagens que pertencem a diferentes haplótipos. Os resultados observados neste trabalho indicam a importância de futuros estudos sobre a fase sexual de E. salmonicolor, uma vez que a anastomose de hifas precede a formação de heterocário, responsável pelos processos de recombinações sexuais e parassexuais, que geram variabilidade genética em fungos filamentosos. / The fungus Erythricium salmonicolor is the causal agent of pink disease, which infects branches of many host plants, such as citrus, rubber, and apple. This disease may be a serious problem in Brazil, since it can reduce the citrus production up to 10%. Brazil is the major world citrus producer, therefore this problem is alarming. The genetic diversity of E. salmonicolor from Brazilian plants has not been evaluated, so the aims of this study were i) to evaluate the genetic diversity by RAPD of E. salmonicolor isolates from São Paulo and Minas Gerais; ii) to evaluate the vegetative compatibility and hyphal fusion of this fungus; and iii) to select endophytic bacteria able to inhibit the E. salmonicolor growth. RAPD analysis showed at least 6 distinct haplotypes (A, B, C, D, E, F), which did not have correlation with the isolation site and host plant. Also, vegetative compatibility tests showed that 84% of crosses resulted in hyphal fusion, but this compatibility was not related to the RAPD haplotypes. Eight endophytic bacteria were selected against E. salmonicolor, which could be used for biological control of this pathogen. However it was observed different types of interaction among endophytic bacteria and E. salmonicolor strains, since these bacteria inihibited differentially two fungi isolates. It reveals the genetic variability between these fungi isolates that belongs to different haplotypes These results show the importance of future studies concerning the sexual phase of E. salmonicolor, since the genetic variability seems to be high and this hyphal fusion, which precede the formation of heterokaryon (sexual and parassexual reproduction), could be responsible for the variability in this filamentous fungus.

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