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The PI (or photosynthesis-irradiance) curve is a graphical representation of the empirical relationship between solar irradiance and photosynthesis. A derivation of the Michaelis–Menten curve, it shows the generally positive correlation between light intensity and photosynthetic rate. It is a plot of photosynthetic rate as a function of light ...
The following is a breakdown of the energetics of the photosynthesis process from Photosynthesis by Hall and Rao: [6]. Starting with the solar spectrum falling on a leaf, 47% lost due to photons outside the 400–700 nm active range (chlorophyll uses photons between 400 and 700 nm, extracting the energy of one 700 nm photon from each one)
The average rate of energy captured by global photosynthesis is approximately 130 terawatts, [6] [7] [8] which is about eight times the total power consumption of human civilization. [9] Photosynthetic organisms also convert around 100–115 billion tons (91–104 Pg petagrams , or billions of metric tons), of carbon into biomass per year.
The photosynthetic rate (Rate of CO 2 exchange in the leaf chamber) is the difference in CO 2 concentration through chamber, adjusted for the molar flow of air per m 2 of leaf area, mol m −2 s −1. The change in H 2 O vapour pressure is water vapour pressure out of leaf chamber, in mbar, minus the water vapour pressure into leaf chamber, in ...
The overall 13 C fractionation for C3 photosynthesis ranges between -20 and -37‰. [2] The wide range of variation in delta values expressed in C3 plants is modulated by the stomatal conductance, or the rate of CO 2 entering, or water vapor exiting, the small pores in the epidermis of a leaf. [1]
This formula determines the overall inflation rate, which is the percentage change in the CPI over a given time period. In January 2024, the CPI increased 3.1 percent over the previous 12 months ...
The fraction of absorbed photosynthetically active radiation (FAPAR, sometimes also noted fAPAR or fPAR) is the fraction of the incoming solar radiation in the photosynthetically active radiation spectral region that is absorbed by a photosynthetic organism, typically describing the light absorption across an integrated plant canopy.
The scientist Charles Barnes first used the word 'photosynthesis' in 1893. This word is taken from two Greek words, photos, which means light, and synthesis, which in chemistry means making a substance by combining simpler substances. So, in the presence of light, synthesis of food is called 'photosynthesis'.