the present invention relates to a biodegradable plastic made from a combination of at least one synthetic plastic polymer , at least one natural polymer and a natural polymer attacking agent and articles made therefrom . the present invention further relates to a method of eliminating hydrocarbon contaminating a region subjected to extreme temperatures by contacting the region with hydrocarbon - degrading microorganisms and adjusting the temperature of the region for optimum growth . the present invention also relates to a method of treating aspirin - ti - eatable conditions comprising administering to a patient in need of such treatment a compound of formula i ## str1 ## in addition , the present invention relates to a method of protecting a philatelic item bearing a mark identifying an expert or owner of the item and possibly an additional distinguishable mark specific to the philatelic item from alteration .