In China, Wang (1991) came with documented results concerning the production and application in China oil fields of biopolymers produced by Leuconostoc mesen- teroides and Pseudomonas aeruginosa strains, as well as by Brevibacterium viscogenes, Corynebacterium gumiform, and Xanthomonas campestris; the last three species were obtained using hydrocarbons for biopolymer production.