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.
Results
Showing 1 to 20 of 22 for “"Photosynthetic apparatus"”.
-
Characterization of the composition and activity of the photosynthetic apparatus in chloroplasts
The effect of growth light intensity on the photosynthetic apparatus of pea thylakoid membranes was investigated. Peas were grown either in a growth chamber at light intensities that ranged from 8 to 1050 $\mu$E/m$\sp2$ $\cdot$ s, or outside under natural sunlight. In thylakoid membranes the …
-
Role of xanthophyll and water-water cycles in the protection of photosynthetic apparatus in Arbutus unedo and Arabidopsis thaliana
Photosynthetic organisms have sought out the delicate balance between efficient light harvesting under limited irradiance and regulated energy dissipation under excess irradiance. One of the protective mechanisms is the thermal energy dissipation through the xanthophyll cycle that may transform …
-
The effect of drying rate on the resurrection species Craterostigma wilmsii (homoiochlorophyllous) and Xerophyta humilis (poikilochlorophyllous)
… resurrection plant, breaks down its photosynthetic apparatus during drying.
-
Variability of photosynthesis genes in purple bacteria and molecular determinants of their spectral properties
The structural genes of the photosynthetic apparatus of two purple bacteria, Amoebobacter (Amb.) purpureus ML1 and Roseospirillum (Rss.) parvum 930I, were investigated by molecular biological methods. Analyses were focused on their light harvesting (LH) 1 core antenna, which is encoded within the …
-
Physiological, biochemical and molecular aspects of induced resistance in maize against Bipolaris maydis infection using a zinc-polyphenolic compound and silicon
… to water-sprayed plants. Less impairment on the photosynthetic apparatus [higher values for leaf gas exchange (rate of net CO 2 assimilation, stomatal conductance to water vapor, and transpiration rate) and chlorophyll a fluorescence (variable-to-maximum Chl a fluorescence ratio, photochemical …
-
A Model for the Chloroplast: A Study of the Photochemical and Spectral Properties of Pheophytin A Adsorbed to the Surface of Small Particles
… the role which the structure of the photosynthetic apparatus has in influencing the nature and efficiency of the photochemical electron-transfer reactions of chlorophyll. This research has involved the study of a simple model for the chloroplast with the purpose of gaining some …
-
Novel photobioreactor systems for characterizing algal behavior in outdoor-simulating environments
… novel photobioreactors for cultivating photosynthetic microorganisms in outdoor-simulating environments. The reactors have been created with the needs of the organisms as well as the lab and scientists in mind for characterizing high productivity candidate strains for outdoor farming of …
-
Population ecology of the dinoflagellate species Lingulodinium Polyedrum in southern California
… a first indication for an involvement of the photosynthetic apparatus in the induction of gametogenesis in dinoflagellates. The light acclimation experiments revealed, for the first time, intraspecific phenotypic diversity in L. polyedrum. The two studied strains differed distinctly in their …
-
Physiological studies of phototrophy and heterotrophy in two algae with contrasting nutritional characteristics, Pyrenomonas salina (Cryptophyceae) and Poterioochromonas malhamensis (Chrysophyceae)
… organic compound additions on the growth and photosynthetic apparatus were examined in two nanophytoplankton with contrasting nutritional characteristics, Pyrenomonas salina (Cryptophyceae) and Poterioochromonas malhamensis (Chrysophyceae). Although both species are capable of …
-
Impact of Air Quality on Lichen Net Carbon Uptake and Structural Organization With Attention to the Role of Photoinhibition
… in the desiccated state by inactivating their photosynthetic apparatus compared to in hydrated state. P. sulcata which is in less shaded habitat is more tolerant to high irradaince by possessing higher content of carotenoids and higher volume density of upper cortex to protect their photobionts …
-
Evidence for reversible phosphorylation as a post-translational regulatory mechanism in the chlorophyll catabolic pathway
… aerial plant tissues is the disassembly of the photosynthetic apparatus, accompanied by the release and degradation of chlorophyll molecules. As unbound chlorophyll and several of its catabolites react readily with light to form damaging reactive oxygen species, chlorophyll degradation functions …
-
Photosynthetic electron transport in cyanobacteria
… cyanobacteria and prochlorophytes have a similar photosynthetic apparatus. The light-driven reactions take place in the thylakoid membranes and three major membrane-intrinsic protein complexes carry out photosynthetic electron transfer, photosystem II, the cytochrome bf complex and photosystem I. …
-
Photocatalysis in a New Light: A Biohybrid Approach for Improved Reactivity with Tunable, Low-Energy Light Excitation
… key step in photocatalytic mechanisms. Natural photosynthetic systems drive the high-energy reactions of photosynthesis with efficient and broadband energy capture. They provide a blueprint toward optimizing these processes in synthetic systems. In photosynthesis, both light capture and …
-
Understanding the Interaction of Mesotrione and Atrazine in Redroot Pigweed (Amaranthus Retroflexus)
… the interaction of mesotrione and atrazine on a photosynthetic level using chlorophyll fluorescence for measuring damage to photosynthetic apparatus supports that the herbicides' synergy is based on an interaction of herbicidal effects within photosynthesis. Further studies investigating effects …
-
Physiological responses of sun and shade foliage in thinned and unthinned ten-year-old loblolly pine stands
… usually associated with shade foliage: lower photosynthetic capacity, lower light compensation point and dark respiration rates. Observed physiological differences were not related to plant water status, chlorophyll content or chlorophyll a/b ratio. The higher light saturated gas exchange …
-
Mediterranean forest resilience to drought and climate change
… differences in species’ investments in the photosynthetic apparatus. I conclude by highlighting the implications of my research for studying the relationships between diversity and ecosystem functioning from space.
-
Characterising natural genetic variation in dynamic photosynthesis and photoprotection in sorghum
… photoprotective processes are key for protecting photosynthetic machinery from excess light energy. Improving the regulation of NPQ in leaves during dynamic light conditions has been identified as a potential route toward increasing photosynthetic efficiency in the world’s most important crops. …
-
Studies on photosystem II in higher plant chloroplasts
… be involved in regulation of some aspect of the photosynthetic apparatus. Evidence has also been gathered implicating Ca2+ as being involved in the OEC possibly in a structural role to organise the components into an efficient 02—evolving configuration. It would also seem that as the isolated …
-
Regulation of the chloroplast light harvesting antenna by plastoquinone redox: Modulation of chlorophyll metabolism and thylakoid complex organization
… deal of interest in the possibility of modifying photosynthetic parameters to improve photosynthesis, specifically with the aim of increasing crop yields for food and biofuels. Photoinhibition, the reduction of photosynthetic electron transport in the face of excess irradiance, is thought to …
-
Improving C4 photosynthetic chilling tolerance in bioenergy crops: the search for elite breeding materials
… use efficiencies than plants utilizing the C3 photosynthetic pathway, although these advantages are only seldom realized under suboptimal temperatures due to photosynthetic limitations at chilling temperatures (<20° C). The mechanistic limitation at chilling temperatures has been suggested to …
Page 1 of 2