20130263793 | NUCLEUS COVERED WITH PHA - The present invention relates to a nucleus covered or coated with a film including one or more PHA. The invention also relates to a PHA, characterized in that it is of the type PHB-V, a film and a composition including the PHA. The invention further relates to a film or a composition including a PHA and zosteric acid or a bioactive molecule. The invention moreover relates to a surface, preferably a nucleus, covered with the film of PHA, a method for production thereof, and methods for grafting a pearl oyster and producing a pearl using this nucleus. Finally, the present invention relates to a method for reducing graft failure and/or for improving the quality of the pearl using the nucleus according to the invention. | 10-10-2013 |