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.
Some accessory pigments include forms of chlorophyll a, such as chlorophyll b, and others do not include forms of chlorophyll a, such as carotenoids. Chlorophyll B Chlorophyll b is an accessory pigment that helps plants absorb light used for energy.