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.
Pleurisy is inflammation of the sheet-like layers that cover the lungs (the pleura). The most common symptom of pleurisy is a sharp chest pain when breathing deeply. Sometimes the pain is also felt in the shoulder. The pain may be worse when you cough, sneeze or move around, and it may be relieved by taking shallow breaths. Other symptoms can include shortness of breath and a dry cough.