Photosynthetic induction strongly affects the light compensation point of net photosynthesis and coincidentally the apparent quantum yield

Trees ◽  
2001 ◽  
Vol 16 (1) ◽  
pp. 47-62 ◽  
Author(s):  
H.C. Timm ◽  
J. Stegemann ◽  
M. Küppers
Keyword(s):  
Quantum Yield ◽  
Net Photosynthesis ◽  
Compensation Point ◽  
Photosynthetic Induction ◽  
Apparent Quantum Yield ◽  
Light Compensation Point

Nitrogen Fixation on a Tropical Volcano, La Soufrière (Guadeloupe): The Interaction of Temperature, Moisture, and Light with Net Photosynthesis and Nitrogenase Activity in Stereocaulon Virgatum and Response to Periods of Insolation Shock

1988 ◽  
Vol 20 (1) ◽  
pp. 63-81 ◽  
Author(s):  
R. P. Fritz-Sheridan ◽  
D. S. Coxson
Keyword(s):  
Quantum Yield ◽  
Light Intensity ◽  
Acetylene Reduction ◽  
Light Exposure ◽  
Nitrogenase Activity ◽  
Dark Respiration ◽  
Net Photosynthesis ◽  
High Light Intensity ◽  
High Light ◽  
Apparent Quantum Yield

AbstractThe response of net photosynthesis, dark respiration and acetylene reduction to temperature, moisture and light intensity were examined for Stereocaulon virgatum growing in the cloud/shroud zone on the tropical volcano La Soufrière, Guadeloupe, French West Indies. Rates for both acetylene reduction and net photosynthesis were maximal at saturating water contents, a pattern attributed to the finely branched nature of the phyllocladoid branchlets and the exposed position of spherical cephalodia, both of which minimize the formation of surface and interhyphal water films. Under conditions typical of those during cloud/shroud periods (13–16°C), thalli of S. virgatum exhibit many characteristics seen in other shade-tolerant lichen species. Net photosynthesis was light saturated at 300 μmol m−2 s−1 PAR, while the photocompensation point was less than 25 µmol m−2 s−1 PAR. Net photosynthetic uptake of carbon dioxide was optimal at 27–34°C, at which point light saturation was near 700 µmol m−2 s−1 PAR and the photocompensation point between 50 and 100 µmol m−2 s−1 PAR. Thalli of S. virgatin exhibited temperature-dependent sensitivity to high insolation. Only at 20°C were thalli able to tolerate high light exposure without reduction of apparent quantum yield. Exposure to high light intensity at 40°C inhibited the apparent quantum yield by almost 40% and acetylene reduction by 95%. This suggests brief periods of insolation shock may exert an influence disproportionately higher than either their frequency or duration. Thalli are normally exposed to cloud/shroud conditions but net photosynthetic uptake was maximal only during periods of elevated thallus temperature experienced at the onset of an insolation shock. However, with prolonged high insolation exposure and further elevation of thallus temperatures and thallus desiccation, severe impairment of subsequent photosynthetic activity ensues. S. virgatum may be characterized as a shade-tolerant species but its physiology is more adapted in some respects to conditions experienced during rare periods of full insolation.

Photolysis of uranium hexafluoride and some reaction variables affecting the apparent quantum yield

1979 ◽  
Vol 11 (5) ◽  
pp. 393-401 ◽  
Author(s):  
W.B. Lewis ◽  
F.B. Wampler ◽  
E.J. Huber ◽  
G.C. Fitzgibbon
Keyword(s):  
Quantum Yield ◽  
Uranium Hexafluoride ◽  
Apparent Quantum Yield

scholarly journals Photosynthetic induction and activity of enzymes related to carbon metabolism: insights into the varying net photosynthesis rates of coffee sun and shade leaves

2013 ◽  
Vol 25 (1) ◽  
pp. 62-69 ◽  
Author(s):  
Samuel Cordeiro Vitor Martins ◽  
Kelly Coutinho Detmann ◽  
Josimar Vieira dos Reis ◽  
Lucas Felisberto Pereira ◽  
Lílian Maria Vincis Pereira Sanglard ◽  
...  
Keyword(s):  
Carbon Metabolism ◽  
Net Photosynthesis ◽  
Photosynthetic Induction ◽  
Sun And Shade Leaves ◽  
Activity Of Enzymes ◽  
Sun And Shade ◽  
Shade Leaves

Controlling the visible-light driven photocatalytic activity of alloyed ZnSe–AgInSe2 quantum dots for hydrogen production

2020 ◽  
Vol 8 (26) ◽  
pp. 13142-13149 ◽  
Author(s):  
Ping-Yen Hsieh ◽  
Tatsuya Kameyama ◽  
Takayuki Takiyama ◽  
Ko Masuoka ◽  
Takahisa Yamamoto ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Quantum Yield ◽  
Hydrogen Production ◽  
Visible Light ◽  
Apparent Quantum Yield ◽  
Visible Light Driven

Alloyed ZnSe–AgInSe2 quantum dots were used as a photocatalyst for H2 production, showing an apparent quantum yield of 3.4% at 600 nm.

Simple Method to Determine the Apparent Quantum Yield Matrix of CDOM Photobleaching in Natural Waters

2020 ◽  
Vol 54 (21) ◽  
pp. 14096-14106
Author(s):  
Xiaohui Zhu ◽  
William L. Miller ◽  
Cédric G. Fichot
Keyword(s):  
Quantum Yield ◽  
Natural Waters ◽  
Apparent Quantum Yield ◽  
Simple Method

Remarkably high apparent quantum yield of the overall photocatalytic H2O splitting achieved by utilizing Zn ion added Ga2O3 prepared using dilute CaCl2 solution

2015 ◽  
Vol 51 (65) ◽  
pp. 12935-12938 ◽  
Author(s):  
Yoshihisa Sakata ◽  
Takuya Hayashi ◽  
Ryō Yasunaga ◽  
Nobuyuki Yanaga ◽  
Hayao Imamura
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Quantum Yield ◽  
High Photocatalytic Activity ◽  
Apparent Quantum Yield ◽  
Cacl2 Solution

Remarkably high photocatalytic activity for the overall H2O splitting was achieved by utilizing a Rh0.5Cr1.5O3(Rh; 0.5 wt%)/Zn(3 mol%)–Ga2O3 photocatalyst when Ga2O3 was prepared using dilute CaCl2 aqueous solution (0.001 mol l−1).

Highly-efficient cocatalyst-free H2-evolution over silica-supported CdS nanoparticle photocatalysts under visible light

2015 ◽  
Vol 51 (53) ◽  
pp. 10676-10679 ◽  
Author(s):  
Guiyang Yu ◽  
Longlong Geng ◽  
Shujie Wu ◽  
Wenfu Yan ◽  
Gang Liu
Keyword(s):  
Quantum Yield ◽  
Visible Light ◽  
Light Illumination ◽  
H2 Evolution ◽  
Apparent Quantum Yield ◽  
Highly Efficient ◽  
Cds Nanoparticle ◽  
Visible Light Driven

A silica-supported CdS nanoparticle photocatalyst exhibits excellent visible-light driven H2evolution activity without the use of a cocatalyst. The apparent quantum yield can reach 42% under 420 nm light illumination.

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