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.
What is pleurisy? Pleurisy is inflammation of the pleura membrane covering the lungs. Pleurisy is also known as pleuritis and can cause chest pain with breathing. Part of a doctor's diagnosis of pleurisy is listening to the chest to check for a distinctive dry and crunching sound with each breath. Seek medical advice about pleurisy if symptoms donât improve or if they get worse after around 3-5 days.