on the other hand, different microganisms have a length between 0.4 and 14 μm and width of 0.2 to 12 μm (Gibbon,1997). in the case of blends having about 30% TPS40, it is possible that microganisms or their colonies can restrict starch diffusion by obstructing the polyethylene pores to result in a significant reduction of the final extent of biodegradation.