The linear mass density can then be understood as the derivative of the mass function with respect to the one dimension of the rod (the position along its length =) The SI unit of linear mass density is the kilogram per meter (kg/m). Linear density of fibers and yarns can be measured by many methods.
An Arabidopsis thaliana chlorophyll(ide) a oxygenase gene (cao), which is responsible for chlorophyll b synthesis from chlorophyll a, was introduced and expressed in a photosystem I-less strain of the cyanobacterium Synechocystis sp.
The absorbed energy is transferred to the reaction center chlorophylls, P 680 in photosystem II, P 700 in photosystem I. Absorption of 1 photon of light by Photosystem II removes 1 electron from P 680. With its resulting positive charge, P 680 is sufficiently electronegative that it can remove 1 electron from a molecule of water.