Nickelsen, K., Govindjee: The Maximum Quantum Yield Controversy. Otto Warburg and the Midwestern Gang

2012 ◽  
Vol 50 (1) ◽  
pp. 139-140
Author(s):  
G. C. Papageorgiou
Keyword(s):  
Quantum Yield ◽  
Maximum Quantum Yield ◽  
Otto Warburg

scholarly journals Potential Maximum Quantum Yield of Photosystem II Reflects the Growth Rate of Chattonella marina in Field Bloom Samples

2016 ◽  
Vol 61 (2) ◽  
pp. 331-335 ◽  
Author(s):  
Xuchun Qiu ◽  
Kouki Mukai ◽  
Yohei Shimasaki ◽  
Michito Tsuyama ◽  
Tadashi Matsubara ◽  
...  
Keyword(s):  
Growth Rate ◽  
Quantum Yield ◽  
Photosystem Ii ◽  
Maximum Quantum Yield ◽  
Chattonella Marina ◽  
Potential Maximum

Zinc requirement for two phytoplankton strains of the Tasman Sea

2017 ◽  
Vol 68 (2) ◽  
pp. 361 ◽  
Author(s):  
Marie Sinoir ◽  
Andrew R. Bowie ◽  
Mathieu Mongin ◽  
Edward C. V. Butler ◽  
Christel S. Hassler
Keyword(s):  
Growth Rate ◽  
Quantum Yield ◽  
Maximum Quantum Yield ◽  
Biological Transport ◽  
Short Term ◽  
Pennate Diatom ◽  
Cellular Energy ◽  
Zn Uptake ◽  
Tasman Sea ◽  
Zinc Concentrations

Zinc has been proposed as a limiting, or co-limiting, micronutrient for phytoplankton. In the Tasman Sea, extremely low zinc concentrations have been reported, raising the possibility there of limitation of phytoplankton growth by zinc. The pennate diatom Nitzschia closterium (CS-1) and the coccolithophorid Emiliania huxleyi (CS-812) were cultured in two low zinc concentrations (Zn2+ = 1.5 pmolL–1 and Zn2+ = 1.5 nmolL–1) mimicking conditions found in coastal and pelagic Tasman Sea. To monitor phytoplankton health and productivity, the maximum quantum yield (Fv/Fm), growth rate and cell size were analysed. These parameters showed that both strains were able to adapt and still grow. Short-term uptake experiments revealed an effect on Zn biological transport, with consequences for its bioavailability. When grown at low Zn2+ concentrations, E. huxleyi showed an induction of a two-transporter system, highly dependent on photosynthetic energy for Zn uptake. N. closterium was able to survive without inducing a higher-affinity Zn transporter. Its Zn uptake was also highly dependent on cellular energy and the ability to potentially access labile complexed forms of Zn. This strategy, thus, represented an advantage over E. huxleyi. Results are discussed in the context of the conditions found in the Tasman Sea.

Nitrogen- and irradiance-dependent variations of the maximum quantum yield of carbon fixation in eutrophic, mesotrophic and oligotrophic marine systems

1996 ◽  
Vol 43 (8) ◽  
pp. 1241-1272 ◽  
Author(s):  
Marcel Babin ◽  
André Morel ◽  
Hervé Claustre ◽  
Annick Bricaud ◽  
Zbigniew Kolber ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Carbon Fixation ◽  
Maximum Quantum Yield ◽  
Marine Systems

scholarly journals Orange Rust Effects on Leaf Photosynthesis and Related Characters of Sugarcane

Plant Disease ◽  
2011 ◽  
Vol 95 (6) ◽  
pp. 640-647 ◽  
Author(s):  
Duli Zhao ◽  
Neil C. Glynn ◽  
Barry Glaz ◽  
Jack C. Comstock ◽  
Sushma Sood
Keyword(s):  
Stomatal Conductance ◽  
Quantum Yield ◽  
Net Photosynthetic Rate ◽  
Photosynthetic Rate ◽  
Transpiration Rate ◽  
Carbon Fixation ◽  
Dark Respiration ◽  
Western Hemisphere ◽  
Maximum Quantum Yield ◽  
Leaf Photosynthesis

Orange rust of sugarcane (Saccharum spp. hybrids), caused by Puccinia kuehnii, is a relatively new disease in the Western Hemisphere that substantially reduces yields in susceptible sugarcane genotypes. The objective of this study was to determine the physiological mechanisms of orange rust–induced reductions in sugarcane growth and yield by quantifying effects of the disease on leaf SPAD index (an indication of leaf chlorophyll content), net photosynthetic rate, dark respiration, maximum quantum yield of CO2 assimilation, carbon fixation efficiency, and the relationships between these leaf photosynthetic components and rust disease ratings. Plants growing in pots were inoculated with the orange rust pathogen using a leaf whorl inoculation method. A disease rating was assigned using a scale from 0 to 4 with intervals of 0.5. At disease ratings ≥2, the rust-infected leaf portion of inoculated plants showed significant reductions in SPAD index, maximum quantum yield, carbon fixation efficiency, stomatal conductance, leaf transpiration rate, and net photosynthetic rate; but the rusted portion of the infected leaves had increased intercellular CO2 concentration and leaf dark respiration rate. Although leaf SPAD index, photosynthetic rate, stomatal conductance, and transpiration rate at the rust-infected portion decreased linearly with increased rust rating, the effect of orange rust on photosynthetic rate was much greater than that on stomatal conductance and transpiration. Unlike earlier reports on other crops, reduction in leaf photosynthesis by orange rust under low light was greater than that under high light conditions. These results help improve the understanding of orange rust etiology and physiological bases of sugarcane yield loss caused by orange rust.

An electrochemical demonstration of the energy cycle and maximum quantum yield in photosynthesis

1953 ◽  
Vol 12 (1-2) ◽  
pp. 347-355 ◽  
Author(s):  
Kurt Damaschke ◽  
Fritz Tödt ◽  
Dean Burk ◽  
Otto Warburg
Keyword(s):  
Quantum Yield ◽  
Maximum Quantum Yield ◽  
Energy Cycle

Plasmonic Au nanoclusters dispersed in nitrogen-doped graphene as a robust photocatalyst for light-to-hydrogen conversion

2021 ◽  
Author(s):  
Dung Van Dao ◽  
Luis A. Cipriano ◽  
Giovanni Di Liberto ◽  
Thuy T. D. Nguyen ◽  
Sang-Woo Ki ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Hydrogen Evolution Reaction ◽  
Visible Light Irradiation ◽  
Reaction Rate ◽  
Maximum Quantum Yield ◽  
Au Nanoclusters ◽  
Nitrogen Doped ◽  
High Maximum ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Au nanoclusters (2.18 wt%) consisting of a few tens of atoms supported nitrogen-doped graphene deliver an impressive hydrogen evolution reaction rate of 3.16 μmol mgcat−1 h−1 under visible-light irradiation and a high maximum quantum yield of 14.3%.

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