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 16 of 16 for “"Chlorophyll a fluorescence"”.
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Development of a rapid Hormosira banksii bioassay using chlorophyll a fluorescence
A wealth of information exists for chlorophyll a fluorescence applications in ecophysiology. However, the use of chlorophyll a fluorescence in marine ecotoxicology has been limited and this is especially true of macroalgal ecotoxicology. The primary objective of this thesis was to develop and …
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A novel approach to investigating chlorophyll-a fluorescence quantum yield variability in the Southern Ocean
The apparent fluorescence quantum yield of chlorophyll-a (ΦF ), i.e. the ratio of photons emitted as chlorophyll-a fluorescence to those absorbed by phytoplankton, serves as a first order measure of photosynthetic efficiency and a photophysiological indicator of the resident phytoplankton …
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The interdependent regulation of photosynthesis and the circadian clock in wheat
… organisms such as wheat. I therefore optimised a chlorophyll a fluorescence imaging system for the measurement of circadian rhythms in wheat leaves (Chapter 3). Using a suite of Arabidopsis mutant lines, I identified chloroplast movement as the most significant driver of chlorophyll a fluorescence …
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Analysing the role of SAL1/PAP retrograde signalling within the circadian system of Arabidopsis thaliana
… to abiotic signals. This study shows that chlorophyll a fluorescence imaging can be used to describe circadian rhythms of PSII operating efficiency (Fq’/Fm’) in the chloroplasts of Arabidopsis thaliana. These circadian rhythms in Fq’/Fm’ are influenced by the well-defined rhythmic …
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Physiological, biochemical and molecular aspects of induced resistance in maize against Bipolaris maydis infection using a zinc-polyphenolic compound and silicon
… to water vapor, and transpiration rate) and chlorophyll a fluorescence (variable-to-maximum Chl a fluorescence ratio, photochemical yield, and yield for dissipation by down-regulation) parameters] along with preserved pool of chlorophyll a+b and carotenoids were noticed for infected and IR …
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Effect of O3 fumigation on photosynthesis and growth of quinoa and its interaction with drought and elevated CO2
… and water stress effects were assessed by prompt chlorophyll a fluorescence induction kinetics. Chlorophyll a fluorescence data for both drought-induced and ozone treated plants exhibited a marked decrease in photochemical efficiency, active photosystem II (PSII) reaction centres per leaf cross …
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Kinetics of electron transfer and binding of inhibitors in the two-electron gate of chloroplasts
… an actinic flash, monitored by decay kinetics of chlorophyll a fluorescence, and the measurement of the partition coefficient of the inhibitors, e.g. DCMU, atrazine, o-phenanthroline, cyanoacrylate derivatives, naphthoquinone analogues.
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Interactions of cadmium, zinc, and phosphorus in marine Synechococcus : field uptake, physiological and proteomic studies
… shallower than 40 m, correlates positively with chlorophyll a concentrations and is roughly equivalent to the calculated upwelling flux of cadmium inside the dome. In laboratory experiments, Synechococcus WH5701 cells exposed to low picomolar quantities of free Cd under Zn deficiency show similar …
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Interactions of cadmium, zinc, and phosphorus in marine Synechococcus : field uptake, physiological and proteomic studies
… shallower than 40 m, correlates positively with chlorophyll a concentrations and is roughly equivalent to the calculated upwelling flux of cadmium inside the dome. In laboratory experiments, Synechococcus WH5701 cells exposed to low picomolar quantities of free Cd under Zn deficiency show similar …
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Seasonal variability of phytoplankton photophysiology in the Southern Ocean: an analysis of uncertainties and the impact of assumptions
… productivity is through active single-turnover chlorophyll-a fluorescence (ST-ChlF) techniques, such as Fast Repetition Rate fluorometry (FRRf), which infer photosynthetic capacity by measuring the transport of electrons during photosynthesis. While promising, this technique requires the …
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Heterogeneity of Leaf-Level Photosynthesis as Seen Through the Lens of Ozone, Soybean, and Chlorophyll Fluorescence Imaging
… and analyze this heterogeneity. Modulated chlorophyll a fluorescence imaging (CFI) coupled with gas exchange was used to test the hypothesis that O 3 induces differential leaf-level spatial effects on photosynthesis in soybean depending on its exposure regime (acute vs. chronic). Spatial …
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AGRONOMIC AND ECO-PHYSIOLOGICAL RESPONSES OF BRASSICACEAE SUBJECTED TO BIOSTIMULANT TREATMENT AND ABIOTIC STRESS
The European Union is committed to achieving climate neutrality by 2050 through its Green Deal, focusing on sustainable agriculture to secure an eco-friendly food supply. The strategy involves "producing more while consuming less," emphasising efficient resource utilisation and fair compensation in …
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An assessment of Eddy Correlation technique in marine habitats
… Eddy Correlation microelectrode system (ECE) and Chlorophyll a fluorescence using PAM under control-flow environment (Chapter 3). The results showed that the ECE has a potential to quantify O₂ flux and O₂ production in seagrass meadows at different light and temperature conditions within a …
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Improving integrated systems for algal biofuels and wastewater treatment
… respiration than WT cells. The slow SM phase of chlorophyll a fluorescence transient was much reduced in IM cells, which is ascribed to a regulatory event called, “state 2 to state 1 change”. Additionally, when the IM strain is grown under low light, non-photochemical quenching of excited …
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Fluorescence lifetime-resolved imaging microscopy studies: quantitative image analysis, spectral-FLIM, and photosynthesis
… and image analysis methods for the fluorescence lifetime-resolved imaging microscopy (FLIM) were carried out in this thesis. With the new instrument setup and imaging processing algorithms, valuable information has been provided for studying in vivo photosynthesis activities. Chapter …
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Strategies to overcome drought stress in ornamental plants in Mediterranean climate [Strategie per superare lo stress da siccità delle piante ornamentali in clima mediterraneo]
Anche a seguito del cambiamento climatico, lo stress da siccità rappresenta uno dei principali ostacoli per la crescita e talvolta per la sopravvivenza delle piante. Il problema è particolarmente avvertito nell’area mediterranea che rappresenta un hotspot climatico, in cui gli effetti dei …