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.
Biodegradation is the chemical dissolution of materials by bacteria, fungi, or other biological means.Although often conflated, biodegradable is distinct in meaning from compostable.n practice, almost all chemical compounds and materials are subject to biodegradation, the key is the relative rates of such processes-minutes, days, years, centuries... A number of factors determine the degradation rate of organic compounds. Salient factors include light, water and oxygen.