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 “"Photosynthetic parameters"”.
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Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem
… in the variation of a number of measurable photosynthetic parameters and variables which can be evaluated in controlled laboratory experiments. The processes can be expressed in time scales from seconds to hours e.g. carbon to chlorophyll ratio changes over several hours. Photoacclimative …
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The environmental and photo-physiological control of microphytobenthos primary production on an intertidal mudflat
… was occurring. A spatial comparison of photosynthetic parameters showed that benthic microalgae inhabiting the lowshore compensated for reduced photoperiods by increasing their photosynthetic capacity (P<sup>B</sup><sub>max</sub>) and efficiency (aB) and decreasing their I<sub>k</sub>. …
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Spatial and Temporal Patterns of Areal and Volumetric Phytoplankton Productivity of Lake Texoma
… and laboratory incubation. Mean values of the photosynthetic parameters, PBmax and alphaB ranged from 4.86 to 46.39 mg O2.mg Chl-1.hr-1 for PBmax and 20.06 to 98.96 mg O2.mg Chl-1.E-1.m2 for alphaB. These values were in the range to be expected for a highly turbid, temperate reservoir. …
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Characterization of natural variation in steady- and non-steady-state photosynthesis and its underlying mechanisms to improve productivity in rice (Oryza sativa)
… to stagnate in recent decades. Improving the photosynthetic performance of rice presents an opportunity to both increase yields and resource-use efficiencies. Historically, most of our understanding of photosynthesis has come through measurements made at a steady-state. However, these …
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Effects of Hydrologic Connection on Physicochemical Conditions and Algal Properties in Backwaters of the Lower Mississippi River
… NO3-N and PO4-P concentrations. Comparisons of photosynthetic parameters of algal communities in the Lower Mississippi River floodplain did not suggest photo-acclimation. However, there were differences in phytoplankton community composition between the main channel and backwater sites that …
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Manipulating Guard Cell Anatomy and Physiology Using Biotechnological Approaches to Understanding Impact on Crop Performance
… atmosphere and therefore have great control on photosynthetic processes and water loss from the plant. The number and patterning of stomata on a leaf are determined by a developmental pathway involving the epidermal patterning factor (EPF) protein family. Several EPF members affect epidermal …
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Multi-scale Remote Assessment of Phenology of Photosynthesis and Productivity of Northern Forests
Northern trees undergo seasonal regulation of photosynthetic activity in response to environmental conditions. Remote sensing provides a powerful tool to assess photosynthetic phenology at the global scale. However, traditional “greenness” based vegetation indices, like the normalized difference …
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Estimation of Primary Production and Carbon Flux in Antarctic Coastal Waters: A Modeling Study
… estimates were increased by up to 130% when photosynthetic parameters with a diel periodicity were used in the production model. Inclusion of spectrally-resolved quantum yields increased primary production estimates by as much as 300%, relative to a reference simulation that used constant …
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Effects of temperature and location on the photosynthesis-irradiance relationship of the seagrass Halophila ovalis
… to reduced light quantity. Knowledge of seagrass photosynthetic characteristics can assist in predicting and managing impacts of light reducing activities, such as dredging. However, information on photo-physiology is quite limited. Most studies on seagrass photosynthetic characteristics generally …
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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 …
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Characterising cyanobacterial and algal bicarbonate transporters using heterologous systems; exploring relationships between sequence, structure and function
… could boost Rubisco carboxylation, increasing photosynthetic efficiency, thereby improving crop productivity. The expression of functional HCO3- transporters in the chloroplast inner envelope membrane (IEM) could support a 7-16% increase in crop productivity resulting from increased CO2 supply …
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Characterising cyanobacterial and algal bicarbonate transporters using heterologous systems; exploring relationships between sequence, structure and function
… could boost Rubisco carboxylation, increasing photosynthetic efficiency, thereby improving crop productivity. The expression of functional HCO3- transporters in the chloroplast inner envelope membrane (IEM) could support a 7-16% increase in crop productivity resulting from increased CO2 supply …
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Respostas fisiológicas e bioquímicas de Lactuca sativa cv Hanson submetida ao arsenato (AsV) e arsenito (AsIII)
As formas inorgânicas de arsênio (As), arsenato (AsV) e arsenito (AsIII) são consideradas as mais tóxicas sendo também, as mais encontradas em plantas. A contaminação de As em alimentos representa um grande risco à saúde pública, já que essa é considerada a segunda principal forma de contaminação …
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Using Silicon Isotopes to Trace the Biogenic Silica in the Southern Ocean
… with the growth, stoichiometric composition, photosynthetic parameters, and increased chlorophyll a (Chl a) and bSi compared to the Dark treatment. A slight increase in the Si isotope composition of bSi for low light and UV-filtered treatments (Day 8) was observed. Due to the low utilisation …
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Using Silicon Isotopes to Trace the Biogenic Silica in the Southern Ocean
… with the growth, stoichiometric composition, photosynthetic parameters, and increased chlorophyll a (Chl a) and bSi compared to the Dark treatment. A slight increase in the Si isotope composition of bSi for low light and UV-filtered treatments (Day 8) was observed. Due to the low utilisation …
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Current and future consequences of tropospheric ozone on soybean biochemistry, physiology and yield
… there is cultivar variation in the antioxidant, photosynthetic, and yield responses of soybean to growth at ambient and double ambient [O3] under field conditions. Ten cultivars of soybean were grown at elevated [O3] from germination through maturity at a fully open-air agricultural field …