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.
Chlorophyll a and b are both primary photosynthetic pigments within the primary reaction centre of the photosystem (in the thylakoid membrane). They receive the absorbed light from the accessory pigments that reside at the anterior of the photosystem. The photon of light hits and the cascade of events commences.