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Calvin–Benson cycle. C 3 carbon fixation is the most common of three metabolic pathways for carbon fixation in photosynthesis, the other two being C 4 and CAM.This process converts carbon dioxide and ribulose bisphosphate (RuBP, a 5-carbon sugar) into two molecules of 3-phosphoglycerate through the following reaction:
The simpler C3 cycle which operates in most plants is adapted to wetter darker environments, such as many northern latitudes. [ citation needed ] Maize , sugar cane , and sorghum are C4 plants. These plants are economically important in part because of their relatively high photosynthetic efficiencies compared to many other crops.
While young children display a wide distribution of reading skills, each level is tentatively associated with a school grade. Some schools adopt target reading levels for their pupils. This is the grade-level equivalence chart recommended by Fountas & Pinnell. [4] [5]
Isotopic fractionation differs between C4 carbon fixation and C3, due to the spatial separation in C4 plants of CO 2 capture (in the mesophyll cells) and the Calvin cycle (in the bundle sheath cells). In C4 plants, carbon is converted to bicarbonate, fixed into oxaloacetate via the enzyme phosphoenolpyruvate (PEP) carboxylase, and is then ...
The Calvin cycle thus happens when light is available independent of the kind of photosynthesis (C3 carbon fixation, C4 carbon fixation, and crassulacean acid metabolism (CAM)); CAM plants store malic acid in their vacuoles every night and release it by day to make this process work. [2]
The first experiments indicating that some plants do not use C 3 carbon fixation but instead produce malate and aspartate in the first step of carbon fixation were done in the 1950s and early 1960s by Hugo Peter Kortschak and Yuri Karpilov.
The CDI manual includes comprehensive information about psychometrics, norms, and item development. Many relevant charts are also included in the manual relating to reliability, constructs, and other areas. [1] Descriptions of CDI's scales are also provided, including examples of sample tests, along with associated tables of data and information.
In psychology, maturity can be operationally defined as the level of psychological functioning (measured through standards like the Wechsler Intelligence Scale for Children) one can attain, after which the level of psychological functioning no longer increases much with age.