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.
Causes of pleurisy. Pleurisy is inflammation of the pleura. It's usually caused by another condition, such as an infection, but sometimes no cause can be identified.The pleura are two thin sheets of tissue that separate the lungs and ribcage.One is attached to the ribcage and the other is attached to the lungs.auses of pleurisy. Pleurisy is inflammation of the pleura. It's usually caused by another condition, such as an infection, but sometimes no cause can be identified.