scholarly journals Ecological significance of blue light stimulation of photosynthetic capacity in Laminaria spp. and other brown algae

1994 ◽  
Vol 113 ◽  
pp. 271-277 ◽  
Author(s):  
MJ Dring ◽  
RM Forster ◽  
R Schmid
Keyword(s):  
Blue Light ◽  
Brown Algae ◽  
Photosynthetic Capacity ◽  
Ecological Significance ◽  
Light Stimulation ◽  
Stimulation Of

scholarly journals Reversible Actuation Ability upon Light Stimulation of the Smart Systems with Controllably Grafted Graphene Oxide with Poly (Glycidyl Methacrylate) and PDMS Elastomer: Effect of Compatibility and Graphene Oxide Reduction on the Photo-Actuation Performance

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 832 ◽  
Author(s):  
Josef Osicka ◽  
Miroslav Mrlik ◽  
Marketa Ilcikova ◽  
Barbora Hanulikova ◽  
Pavel Urbanek ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Glycidyl Methacrylate ◽  
Mechanical Response ◽  
Dynamic Mechanical Properties ◽  
Light Stimulation ◽  
Smart Systems ◽  
Elastomeric Matrix ◽  
Chain Mobility ◽  
Angle Measurements ◽  
Stimulation Of

This study is focused on the controllable reduction of the graphene oxide (GO) during the surface-initiated atom transfer radical polymerization technique of glycidyl methacrylate (GMA). The successful modification was confirmed using TGA-FTIR analysis and TEM microscopy observation of the polymer shell. The simultaneous reduction of the GO particles was confirmed indirectly via TGA and directly via Raman spectroscopy and electrical conductivity investigations. Enhanced compatibility of the GO-PGMA particles with a polydimethylsiloxane (PDMS) elastomeric matrix was proven using contact angle measurements. Prepared composites were further investigated through the dielectric spectroscopy to provide information about the polymer chain mobility through the activation energy. Dynamic mechanical properties investigation showed an excellent mechanical response on the dynamic stimulation at a broad temperature range. Thermal conductivity evaluation also confirmed the further photo-actuation capability properties at light stimulation of various intensities and proved that composite material consisting of GO-PGMA particles provide systems with a significantly enhanced capability in comparison with neat GO as well as neat PDMS matrix.

scholarly journals Acclimating Cucumber Plants to Blue Supplemental Light Promotes Growth in Full Sunlight

2021 ◽  
Vol 12 ◽  
Author(s):  
Chenqian Kang ◽  
Yuqi Zhang ◽  
Ruifeng Cheng ◽  
Elias Kaiser ◽  
Qichang Yang ◽  
...  
Keyword(s):  
Blue Light ◽  
Photosynthetic Capacity ◽  
Light Exposure ◽  
Chlorophyll Concentration ◽  
Solar Light ◽  
Shoot Biomass ◽  
Light Use Efficiency ◽  
Production Environment ◽  
Full Sunlight ◽  
Use Efficiency

Raising young plants is important for modern greenhouse production. Upon transfer from the raising to the production environment, young plants should maximize light use efficiency while minimizing deleterious effects associated with exposure to high light (HL) intensity. The light spectrum may be used to establish desired traits, but how plants acclimated to a given spectrum respond to HL intensity exposure is less well explored. Cucumber (Cucumis sativus) seedlings were grown in a greenhouse in low-intensity sunlight (control; ∼2.7 mol photons m–2 day–1) and were treated with white, red, blue, or green supplemental light (4.3 mol photons m–2 day–1) for 10 days. Photosynthetic capacity was highest in leaves treated with blue light, followed by white, red, and green, and was positively correlated with leaf thickness, nitrogen, and chlorophyll concentration. Acclimation to different spectra did not affect the rate of photosynthetic induction, but leaves grown under blue light showed faster induction and relaxation of non-photochemical quenching (NPQ) under alternating HL and LL intensity. Blue-light-acclimated leaves showed reduced photoinhibition after HL intensity exposure, as indicated by a high maximum quantum yield of photosystem II photochemistry (Fv/Fm). Although plants grown under different supplemental light spectra for 10 days had similar shoot biomass, blue-light-grown plants (B-grown plants) showed a more compact morphology with smaller leaf areas and shorter stems. However, after subsequent, week-long exposure to full sunlight (10.7 mol photons m–2 day–1), B-grown plants showed similar leaf area and 15% higher shoot biomass, compared to plants that had been acclimated to other spectra. The faster growth rate in blue-light-acclimated plants compared to other plants was mainly due to a higher photosynthetic capacity and highly regulated NPQ performance under intermittent high solar light. Acclimation to blue supplemental light can improve light use efficiency and diminish photoinhibition under high solar light exposure, which can benefit plant growth.

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