Bioenergy cellulose simulation. Molecular model simulation of cellulose (blue) surrounded by lignin molecules (red and green). This simulation tracked the motions of 3.3 million atoms. Water molecules were also present, but are not shown. Cellulose and lignin are the main components of plant biomass, and research into the properties of these chemical compounds is being done to aid the development of biofuels. This work is being carried out at Oak Ridge National Laboratory, Tennessee, USA. Image published in 2009.