Global ETD Search

1	Induction of a photomixotrophic plant cell culture of Helianthus annuus and optimization of culture conditions for improved α-tocopherol production Geipel, Katja, Song, Xue, Socher, Maria Lisa, Kümmritz, Sibylle, Püschel, Joachim, Bley, Thomas, Ludwig-Müller, Jutta, Steingroewer, Juliane 26 January 2017 (has links) (PDF) Tocopherols, collectively known as vitamin E, are lipophilic antioxidants, which are synthesized only by photosynthetic organisms. Due to their enormous potential to protect cells from oxidative damage, tocopherols are used e.g. as nutraceuticals and additives in pharmaceuticals. The most biologically active form of vitamin E is α-tocopherol. Most tocopherols are currently produced via chemical synthesis. Nevertheless, this always results in a racemic mixture of different and less effective stereoisomers because the natural isomer has the highest biological activity. Therefore, tocopherols synthesized in natural sources are preferred for medical purposes. The annual sunflower (Helianthus annuus L.) is a well-known source for α-tocopherol. Within the presented work, sunflower callus and suspension cultures were established growing under photomixotrophic conditions to enhance α-tocopherol yield. The most efficient callus induction was achieved with sunflower stems cultivated on solid Murashige and Skoog medium supplemented with 30 g l-1 sucrose, 0.5 mg l-1 of the auxin 1-naphthalene acetic acid and 0.5 mg l-1 of the cytokinin 6-benzylaminopurine. Photomixotrophic sunflower suspension cultures were induced by transferring previously established callus into liquid medium. The effects of light intensity, sugar concentration and culture age on growth rate and α-tocopherol synthesis rate were characterized. A considerable increase (max. 230 %) of α-tocopherol production in the cells was obtained within the photomixotrophic cell culture compared to a heterotrophic cell culture. These results will be useful for improving α-tocopherol yields of plant in vitro cultures. Sonnenblumen Photobiotechnologie Photosynthese Vitamin E photomixotrophic plant in vitro culture sunflower photobiotechnology photosynthesis vitamin E ddc:570 rvk:WA 15000
2	Induction of a photomixotrophic plant cell culture of Helianthus annuus and optimization of culture conditions for improved α-tocopherol production Geipel, Katja, Song, Xue, Socher, Maria Lisa, Kümmritz, Sibylle, Püschel, Joachim, Bley, Thomas, Ludwig-Müller, Jutta, Steingroewer, Juliane January 2014 (has links) Tocopherols, collectively known as vitamin E, are lipophilic antioxidants, which are synthesized only by photosynthetic organisms. Due to their enormous potential to protect cells from oxidative damage, tocopherols are used e.g. as nutraceuticals and additives in pharmaceuticals. The most biologically active form of vitamin E is α-tocopherol. Most tocopherols are currently produced via chemical synthesis. Nevertheless, this always results in a racemic mixture of different and less effective stereoisomers because the natural isomer has the highest biological activity. Therefore, tocopherols synthesized in natural sources are preferred for medical purposes. The annual sunflower (Helianthus annuus L.) is a well-known source for α-tocopherol. Within the presented work, sunflower callus and suspension cultures were established growing under photomixotrophic conditions to enhance α-tocopherol yield. The most efficient callus induction was achieved with sunflower stems cultivated on solid Murashige and Skoog medium supplemented with 30 g l-1 sucrose, 0.5 mg l-1 of the auxin 1-naphthalene acetic acid and 0.5 mg l-1 of the cytokinin 6-benzylaminopurine. Photomixotrophic sunflower suspension cultures were induced by transferring previously established callus into liquid medium. The effects of light intensity, sugar concentration and culture age on growth rate and α-tocopherol synthesis rate were characterized. A considerable increase (max. 230 %) of α-tocopherol production in the cells was obtained within the photomixotrophic cell culture compared to a heterotrophic cell culture. These results will be useful for improving α-tocopherol yields of plant in vitro cultures. info:eu-repo/classification/ddc/570 ddc:570
3	Methodische Untersuchungen zum Einsatz der Nahinfrarot-Spektroskopie (NIRS) zur Qualitätsbeurteilung von High-Oleic-Sonnenblumen / Investigations for the estimation of several quality parameters of high oleic sunflower achenes by near-infrared spectroscopy (NIRS) Moschner, Christian R. 12 July 2007 (has links) No description available. 570 Biowissenschaften Biologie Agricultural Sciences Nahinfrarot-Spektroskopie NIRS Chemometrie High-Oleic-Sonnenblumen near-infrared spectroscopy NIRS chemometrics high-oleic sunflower 35.05 Mathematische Chemie chemische Statistik (Chemometrie) 35.25 Spektrochemische Analyse 48.58 Pflanzenzüchtung RRB 000 (Nah-)Infrarotspektroskopie YA 000 Land- und Forstwirtschaft
4	Agronomic approaches in yield and quality stability of high oleic sunflowers (Helianthus annuus L.) / Pflanzenbauliche Ansätze zur Ertrags- und Qualitätssicherung bei hochölsäurehaltigen (HO) Sonnenblumen (Helianthus annuus L.) Dilci, Burcin 23 October 2008 (has links) No description available. 630 Landwirtschaft Veterinärmedizin Agricultural Sciences HO Sonnenblumen Ertrag Ölqualität pilzlicher Krankheiten Sclerotinia sclerotiorum Botrytis cinerea BTH Bion Flüssiginjektionsdüngung CULTAN Mikro-Vital High oleic sunflowers yield oil quality fungal diseases Sclerotinia sclerotiorum Botrytis cinerea BTH Bion ammonium fertilizer injection CULTAN Mikro-Vital 48.50 48.52 48.54

1

Page generated in 0.0526 seconds