Of the common causes for exudative pleural effusions, parapneumonic effusions have the highest diagnostic priority. Even in the face of antibiotic therapy, infected pleural effusions can rapidly coagulate and organize to form fibrous peels that might require surgical decortication.
Retrogradation is the landward change in position of the front of a river delta with time.etrogradation is the landward change in position of the front of a river delta with time.
In particular it appears that retrogradation is the recrystallization of the amylopectin where the amylose molecules clump together and separate from the sol or gel, thus destroying the semi-elastic network on which its properties depend.Retrogradation is more likely to occur in a high amylose starch.n particular it appears that retrogradation is the recrystallization of the amylopectin where the amylose molecules clump together and separate from the sol or gel, thus destroying the semi-elastic network on which its properties depend.