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Showing 1 to 20 of 313 for “"chlorophyll a"”.
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Newly Discovered Intermediates in the Chlorophyll a Biosynthetic Pathway
Several new intermediates in chlorophyll a biosynthesis were detected in higher plants and chemically identified. The newly discovered pigments are divinyl protochlorophyllide, divinyl protochlorophyllide ester, divinyl chlorophyllide a, divinyl chlorophyll a and monovinyl …
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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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Spectroscopic Studies of Chlorophyll a Complexes with Trinitro-Substituted Flourene Derivatives
… and excited-state lifetime studies of chlorophyll a (Chl a) with fluorene, 2-(2,4,7-Trinitro-fluoren-9-ylideneaminooxy)-propionic acid (TFPR), 2- (2,4,7-Trinitro-fluoren-9-ylidenemethyl)-phenol, (TFPH), and 9-Isopropylidene-2,4,7- trinitro-9H-fluorene (ITNF) have been investigated. …
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Seasonal and inter-annual variability of SST and chlorophyll-a off Angola
… in SST and in concentration of surface chlorophyll-a of the main oceanographic features off Angola. SST time-series over the 1987 to 2002 were derived from Meteosat 5-day SST composites with a spatial resolution of about 5-6 km in Angolan waters and a thermal resolution of 0.5°C. …
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Quantifying Chlorophyll a Content Through Remote Sensing: A Pilot Study of Utah Lake
… of existing in situ water samples measuring chlorophyll a. The brightness values of the imagery were regressed against the water samples to produce a model to accurately predict chlorophyll a concentrations across the entire lake. The results of the pilot study conclude that Landsat imagery …
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Evaluating multi-satellite chlorophyll-a datasets an ocean colour case study within the Southern Benguela
Chlorophyll-a (chl-a), a photosynthetic pigment that can be derived from satellite ocean colour, is often used as a proxy for phytoplankton biomass and to derive primary productivity. Initiatives such as the Ocean Colour Climate Change Initiative (OC-CCI) produce merged multi-satellite products to …
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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 inter-annual variability in the onset of the enhanced chlorophyll-a east of Madagascar
Chlorophyll-a concentration is a measure of phytoplankton biomass and is therefore used as a proxy for primary production. The chlorophyll bloom occurring in the South western Indian Ocean is one of the major blooms in the open ocean and is subject to controversies about its formation, propagation …
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Remote Sensing of Cyanobacteria in Case II Waters Using Optically Active Pigments, Chlorophyll a and Phycocyanin
… optical properties of blue-green algal pigments (chlorophyll a and phycocyanin) can provide rapid detection of blue-green algal distribution. Coupled with physical and chemical data from lakes, remote sensing can provide an efficient method for tracking cyanobacteria bloom occurrence and toxin …
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An investigation of medium effects on the one and two-dimensional electronic spectroscopy of chlorophyll a
… known pigment involved in the photosynthesis, Chlorophyll a, and their changes with different solvents. The study of the pigment was conducted by linear spectroscopic studies for water-solvent mixtures, while by the nonlinear technique 2D spectroscopy was applied for pure solvent. The theory …
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Relating an archive of in situ vertical chlorophyll-a profiles to concurrent remotely sensed surface data
… scientists an unprecedented view of near-surface chlorophyll distribution and other surface conditions, including sea surface temperature and wind data, from regional to global scales but little information on the dynamics below the surface. As a result estimates of global production tend to use …
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The Function and Structural Organization of The Light Harvesting Chlorophyll A/b Protein in Chloroplast Membrane
Made available in DSpace on 2015-05-14T15:08:28Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7708920.PDF: 5112889 bytes, checksum: a53d201d8d005c2fc4739ffdaedf399b (MD5) Previous issue date: 1976
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Localization, biochemical characterization, and solubilization of (4-vinyl) chlorophyllide a reductase, a novel chlorophyll a biosynthetic enzyme
(4-vinyl) chlorophyllide a reductase (4VCR), catalyses the conversion of divinyl chlorophyllide a (DVChlide a) to monovinyl chlorophyllide a (MVChlide a). The latter is the immediate precursor of monovinyl chlorophyll a (MVChl a) in plants and algae. In reaction center and light harvesting …
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Mapping and Modeling Chlorophyll-a Concentrations in the Lake Manassas Reservoir Using Landsat Thematic Mapper Satellite Imagery
… sought to ascertain the spatial distribution of chlorophyll-a concentrations in the Lake Manassas Reservoir using a combination of Landsat TM satellite imagery and ground based field measurements. Images acquired on May 14, 1998 and March 8, 2000 were analyzed with chlorophyll-a measurements …
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Comparison of spatial and spectral properties of Landsat-8 and Sentinel-2 data for mapping plant chlorophyll-a
Background Chlorophyll-a (Chl-a) is a vital parameter to assess vegetation quality in plants as an indicator of photosynthetic capacity to ensure proper flow of ecosystem services. Nowadays, with a rapid increase in human population and deforestation chl-a in higher plants remain at risk from …
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USING AIRBORNE HYPERSPECTRAL IMAGERY TO ESTIMATE CHLOROPHYLL A AND PHYCOCYANIN IN THREE CENTRAL INDIANA MESOTROPHIC TO EUTROPHIC RESERVOIRS
… predicting phytoplankton pigment concentrations (chlorophyll a and phycocyanin) from remotely sensed imagery. Hyperspectral airborne and hand-held reflectance spectra were acquired on three reservoirs (Geist, Morse and Eagle Creek) in Central Indiana, USA. Concurrent with the reflectance …
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Seasonal and interannual variability of surface chlorophyll-a and sea surface temperature in the Delgoa Bight, southern Mozambique
Multi satellite data for surface chlorophyll‐a (Chl‐a), sea surface temperature (SST), sea surface wind (SSW) and sea level anomalies (SLA) have been obtained and analysed over the Delagoa Bight (24‐28°S, 32‐36°E), southern Mozambique for the period 2003‐2012 at monthly time scales. Both …
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Studies on 4-vinyl protochlorophyllide reductase and the biological significance of the divinyl and monovinyl monocarboxylic chlorophyll a biosynthetic routes
Monovinyl chlorophyll a is the end product of chlorophyll a biosynthesis in higher plants. Most of the monovinyl chlorophyll a is formed via two major biosynthetic routes, the divinyl and monovinyl monocarboxylic routes which appear to be linked at various levels of chlorophyll precursors. The …
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Heavy metal concentrations, primary productivity, chlorophyll-a levels, and the autotrophic indices of stream periphyton subjected to wood preservation waste
… The periphyton primary productivity, chlorophyll-a content, and autotrophic index were also determined. Water samples were analyzed for the three metals; arsenic, chromium, and copper. The highest mean periphyton arsenic and chromium concentration occurred at the station 1.2 miles …
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Untersuchungen zur Expression der Gene, die für die Fucoxanthin Chlorophyll a/c bindenden lichtsammelnden Polypeptide der centrischen Diatomee Cyclotella cryptica codieren
Die Transkriptgrößen der fcp Gene von Cyclotella cryptica wurden bestimmt. Außerdem wurde die steady state mRNA Konzentration aller fcp Gencluster im Hinblick auf den Einfluß von Lichtqualität und -quantität untersucht. Die Transkriptmengen der fcp Gencluster oszillierten auf diurnale Weise. Die …
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