1.4 Chemical Determination. Proteins are complex, organic compounds composed of many amino acids linked together through peptide bonds and cross-linked between chains by sulfhydryl bonds, hydrogen bonds and van der Waals forces.
What causes pleurisy? In young, healthy people, an infection of the lower respiratory system by a virus or bacteria may cause pleurisy. Pleurisy usually lasts a few days to 2 weeks. In very rare cases, the virus or bacteria may spread and cause pleurisy in others. Other causes of pleurisy include air leaking into the pleural cavity from a hole in a lung (pneumothorax), injury to the chest (such as a broken rib), tuberculosis or other infections, or a tumor in the pleura.
The pleural cavity is the area between the lungs and inner chest wall. Pleurisy is a common complication of several different medical conditions, the most pervasive being a viral infection of the lower respiratory system.Other causes of pleurisy include: 1  Bacterial infections such as pneumonia and tuberculosis.2  A chest wound that punctured the pleural cavity. 3  A pleural tumor. 4  Autoimmune disorders like lupus and rheumatoid arthritis. 5  Sickle cell anemia. 6  Pancreatitis. 7  Pulmonary embolism.ther causes of pleurisy include: 1  Bacterial infections such as pneumonia and tuberculosis. 2  A chest wound that punctured the pleural cavity. 3  A pleural tumor. 4  Autoimmune disorders like lupus and rheumatoid arthritis.