Fractionation of carbon isotopes in oxygenic photosynthesis values more similar to C3 plants. In contrast to terrestrial plants, where CO diffusion in air is relatively fast and typically not limiting, diffusion of dissolved CO in water is considerably slower and can often limit carbon fixation in phytoplankton. As gaseous CO is dissolved into aqueous CO, it is fractionated by both kinetic and equilibrium effects that are temperature-dependent. Relative to plants, the dissolved CO source for phytoplankton can be enriched in C by about 8‰ from atmospheric CO. Isotope fractionation of C by phytoplankton photosynthesis is affected by the diffusion of extracellular aqueous CO into the cell, the
What You Need (The Twilight Zone) What You Need (The Twilight Zone) "What You Need" is episode 12 of the American television anthology series "The Twilight Zone". It is based on the short story of the same name by Lewis Padgett (Henry Kuttner and C. L. Moore). Pedott , a peddler, has the curious ability to give people exactly what they need before they need it. He enters a coffee shop where he first gives a woman a vial of cleaner. Then he gives a down-on-his-luck ex-baseball player a bus ticket to Scranton, Pennsylvania. Moments later, the ball player receives a phone call at the cafe