Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 56 for “"UV-B"”.
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UV-B-Induzierte Genexpression bei der Buche Fagus sylvatica L.
… es, Veränderungen innerhalb weniger Stunden nach UV-B-Exposition auf Protein- und Transkriptionsebene bei 10-wöchigen Buchensämlingen Fagus sylvatica L. zu analysieren. Dazu wurden Buchensamen unter standardisierten Bedingungen angezogen und von dem Zeitpunkt der Keimung an unter einem …
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Hydroxycinnamoyl-Transferasen für UV-B-Schutzpigmente in der Kiefer, Pinus sylvestris L
… Synthese von acylierten Flavonolglykosiden, den UV-B-Schutzpigmenten in der Kiefer und anderen Bäumen, beteiligten Hydroxycinnamoyl-Transferasen sind weitgehend unerforscht. Dies verwundert um so mehr, als Kenntnisse über den UV-B-Schutz bei Bäumen, die von großer ökologischer und ökonomischer …
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UV-resistance locus 8 and UV-B specific signaling in Arabidopsis thaliana
UV-B is a natural component of the sunlight spectrum. As a result of the potentially harmful effects of this radiation, plants have evolved a highly effective suit of protective and repair mechanisms. However, the signalling pathways that control such responses are not yet well known. For example …
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Genetic effects of prolonged UV-B exposure in a Namaqualand daisy - Dimorphotheca sinuata
… into the genetic effects of long term UV-B exposure in Namaqualand daisies (Dimorphotheea sinuata) grown for several generations under ambient and enhanced UV-B levels. Enhanced UV-B radiation was found to have a major effect on the biochemical composition of the chloroplast accompanied …
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The effect of UV-B radiation on flavonoid accumulation and gene expression in Marchantia polymorpha
… adaption allowing this transition was to that of UV-B radiation and is the main focus of this study. This thesis investigates the effect of UV-B radiation on the basic land plant M. polymorpha and its responce through the production of secondary metabolites, in particular flavonoids. How flavonoid …
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Subcellular localisation and functional analysis of UVR8, a UV-B specific signalling component in Arabidopsis
UV-B is an integral component of the daylight spectrum that regulates plant gene expression and development, but very little is known about how plants perceive UV-B. Although UV-B-induced damage and repair have been extensively investigated, the mechanisms by which UV-B is perceived as a signal, …
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Evolutionary response of plants to increased UV-B radiation: Greenhouse and field studies with Arabidopsis thaliana
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Level of UV-B Radiation Influences the Effects of Glyphosate-Based Herbicide on Fitness of the Spotted Salamander
… habitat modification, ultraviolet radiation (UV-B) and environmental contaminants (such as glyphosate-based herbicide) being among the most common. This study identifies the effects of a generic glyphosate-based herbicide (GLY- 4 Plus) on mortality, immune function, body condition, and …
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Photosynthetic and oxidative stress in the green alga Dunaliella tertiolecta: The effects of UV-B and UV-A radiation
<p>The penetration of ultraviolet-B (UV-B; 290-320 nm) into the biosphere has increased in response to decreased stratospheric ozone. As a consequence, significant attempts have been made to elucidate the effects of UV-B radiation on primary producers such as phytoplankton and plants. Considerably …
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Licht- und UV-B-Wirkung auf die Bildung von Lignin, Flavonoiden und Tanninen in Keimlingen der Waldkiefer (Pinus sylvestris L.)
… (Pinus sylvestris) wurde die Licht- und UV-Regulation von UV-absorbierenden und damit möglicherweise dem UV-Schutz dienenden Phenylpropanverbindungen untersucht. Dabei wurde versucht zwischen UV-Akklimatisierungs- und UV-Streß-Reaktionen zu unterschieden, welche beide zur Bildung solcher …
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Salt stress and UV-B radiation modulate growth, physiology and 20-hydroxyecdysone contents in Brazilian-ginseng [Pfaffia glomerata (Spreng.) Pedersen]
… aiming to evaluate the impact of salt stress and UV-B radiation on growth, physiology, expression of key genes involved in the biosynthesis and the 20E content in Pfaffia glomerata. In the first experiment, accession 43 (A43) plants with 40-day-old grown in greenhouse were exposed to 0-, 120-, …
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Biotechnological applications of UV-B radiation in agri-food crops from La Rioja: grapes and mushrooms as models of quality and sustainability
From the observational methodology approach, this thesis analyses error in chess, conceived as an inherent aspect of the learning process. Errors are manifested both through illegal moves, which reflect an incomplete understanding of the rules, and through erroneous moves, associated with a lack of …
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The effects of ultraviolet-B radiation on antioxidant status and survival in the zebrafish.
Increased exposure to solar radiation in the UV-B range (280-320 nm) is occurring globally at least partly due to anthropogenic degradation of stratospheric ozone. The direct impact of present ambient (1.95 W/m$\sp2$) and sub-ambient doses of UV-B radiation on muscle and skin tissue antioxidants in …
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Ultraviolet radiation and aquatic bryophytes: physiological damage and protection mechanisms under laboratory and field conditions
… provoca un aumento de radiación ultravioleta-B (UV-B) en la Biosfera, lo que puede afectar a los organismos fotosintéticos. Dado que los briófitos de arroyos de montaña se han estudiado poco en este sentido, el objetivo de esta Tesis era profundizar en el conocimiento de las respuestas …
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The role of arabidopsis UV-resistance locus 8 protein in regulating photosynthetic competence
Arabidopsis thaliana UV-Resistance Locus 8 (UVR8) is a UV-B-specific protein that regulates genes concerned with protection against ultraviolet-B (UV-B) radiation. Some of these genes encode chloroplast proteins including the RNA polymerase sigma factor, sigma 5 (SIG5) and one of the Early Light …
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The Effects of Ultraviolet-B Radiation on Aquatic Invertebrates
… little is known about the effects of UV-B radiation on aquatic ecosystems. The purpose of this study was to assess the sensitivity of aquatic invertebrates to UV-B radiation. Solar simulators were used to expose five species of aquatic invertebrates to enhance levels of UV-B radiation. …
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PcEF1, ein frühes UV-induziertes Gen aus Petersilie (Petroselinum crispum L.), kodiert für ein neuartiges Ca2+-bindendes Protein
… Gen PcEF1 innerhalb von Minuten transient durch UV-B Strahlung, mechanischen-, Trocken- und Kältestress sowie durch Elicitoren (PEP13, Pmg) transkriptionell induziert wird. PcEF1 bildet mit homologen Proteinen aus anderen Spezies eine neuartige pflanzenspezifische Proteinfamilie. Das PcEF1-Gen …
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