30 Result(s)
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Douglas A. Campbell
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Article
Open AccessThe Photoprotective Behavior of a Motile Benthic Diatom as Elucidated from the Interplay Between Cell Motility and Physiological Responses to a Light Microgradient Using a Novel Experimental Setup
It has long been hypothesized that benthic motile pennate diatoms use phototaxis to optimize photosynthesis and minimize photoinhibitory damage by adjusting their position within vertical light gradients in co...
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Article
Open AccessLight history modulates growth and photosynthetic responses of a diatom to ocean acidification and UV radiation
To examine the synergetic effects of ocean acidification (OA) and light intensity on the photosynthetic performance of marine diatoms, the marine centric diatom Thalassiosira weissflogii was cultured under ambien...
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Chapter
Photosynthetic Light Reactions in Diatoms. II. The Dynamic Regulation of the Various Light Reactions
Photosynthesis in diatoms is performed using the same basic modules as cyanobacteria and plants. It can be regulated on multiple levels depending on the environmental cues, allowing diatoms to adjust their pho...
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Reference Work Entry In depth
Photoinhibition: Fundamentals and Implications for Primary Productivity
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Chapter
Photosynthetic Light Reactions in Diatoms. I. The Lipids and Light-Harvesting Complexes of the Thylakoid Membrane
Light harvesting and photochemistry is performed by photosystems coupled to specific antennae embedded in the thylakoid membrane, a common principle across diatoms, plants, and green algae. Still, unique featu...
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Living Reference Work Entry In depth
Photoinhibition: Fundamentals and Implications for Primary Productivity
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Chapter
Photoinhibition of Photosystem II in Phytoplankton: Processes and Patterns
All the diverse lineages of phytoplankters use conserved Photosystem II complexes to mediate photochemical extraction of electrons from water, with concomitant release of oxygen. Photosystem II suffers light-d...
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Article
Decoupling light harvesting, electron transport and carbon fixation during prolonged darkness supports rapid recovery upon re-illumination in the Arctic diatom Chaetoceros neogracilis
During winter in the Arctic marine ecosystem, diatoms have to survive long periods of darkness caused by low sun elevations and the presence of sea ice covered by snow. To better understand how diatoms survive...
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Article
Correction to: Arctic Micromonas uses protein pools and non-photochemical quenching to cope with temperature restrictions on Photosystem II protein turnover
In Table 2 of the original publication, all instances of krec in the Parameter and Equation columns should read krecinact.
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Article
Open AccessArctic Micromonas uses protein pools and non-photochemical quenching to cope with temperature restrictions on Photosystem II protein turnover
Micromonas strains of small prasinophyte green algae are found throughout the world’s oceans, exploiting widely different niches. We grew arctic and temperate strains of Micromonas and co...
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Article
Open AccessInteractive effects of nitrogen and light on growth rates and RUBISCO content of small and large centric diatoms
Among marine phytoplankton groups, diatoms span the widest range of cell size, with resulting effects upon their nitrogen uptake, photosynthesis and growth responses to light. We grew two strains of marine cen...
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Article
Under high light stress two Indo-Pacific coral species display differential photodamage and photorepair dynamics
The in hospite Symbiodinium symbiont of corals on shallow reefs relies on photoprotection and photorepair during periods of exposure to short-term high light and/or temperature stress. A coral’s susceptibility to...
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Article
Photosystem II repair in marine diatoms with contrasting photophysiologies
Skeletonema costatum and Phaeodactylum tricornutum are model marine diatoms with differing strategies for non-photochemical dissipation of excess excitation energy within photosystem II (...
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Article
Changes in the Rubisco to photosystem ratio dominates photoacclimation across phytoplankton taxa
When growth irradiance changes, phytoplankton acclimates by changing allocations to cellular components to re-balance their capacity to absorb photons versus their capacity to use the electrons from the oxidat...
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Article
Electron transport kinetics in the diazotrophic cyanobacterium Trichodesmium spp. grown across a range of light levels
The diazotrophic cyanobacterium Trichodesmium is a major contributor to marine nitrogen fixation. We analyzed how light acclimation influences the photophysiological performance of Trichodesmium IMS101 during exp...
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Article
Increased reliance upon photosystem II repair following acclimation to high-light by coral-dinoflagellate symbioses
Changing light environments force photoautotroph cells, including coral symbionts, to acclimate to maintain photosynthesis. Photosystem II (PSII) is subjected to photoinactivation at a rate proportional to the...
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Article
Photosystem II protein clearance and FtsH function in the diatom Thalassiosira pseudonana
All oxygenic photoautotrophs suffer photoinactivation of their Photosystem II complexes, at a rate driven by the instantaneous light level. To maintain photosynthesis, PsbA subunits are proteolytically removed...
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Article
Physiological characterization and light response of the CO2-concentrating mechanism in the filamentous cyanobacterium Leptolyngbya sp. CPCC 696
We studied the interactions of the CO2-concentrating mechanism and variable light in the filamentous cyanobacterium Leptolyngbya sp. CPCC 696 acclimated to low light (15 μmol m−2 s−1 PPFD) and low inorganic carbo...
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Article
Flux capacities and acclimation costs in Trichodesmium from the Gulf of Mexico
Phytoplankton function and acclimation are driven by catalytic protein complexes that mediate key physiological transformations, including generation of photosynthetic ATP and reductant, and carbon and nitroge...
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Article
Dynamics of Fluxes Through Photosynthetic Complexes in Response to Changing Light and Inorganic Carbon Acclimation in Synechococcus elongatus
Cyanobacteria acclimate to environmental inorganic carbon (Ci) concentrations through re-organisations of photosynthetic function and the induction of carbon concentrating mechanisms (CCMs), which alter and const...
