Acetyl group known as paracetamol), and acetylsalicylic acid (better known as aspirin). The introduction of an acetyl group into a molecule is called acetylation. In biological organisms, acetyl groups are commonly transferred from acetyl-CoA to other organic molecules. Acetyl-CoA is an intermediate both in the biological synthesis and in the breakdown of many organic molecules. Acetyl-CoA is also created during the second stage of cellular respiration, the Krebs Cycle, by the action of pyruvate dehydrogenase on pyruvic acid. Histones and other proteins are often modified by acetylation. For example, on the DNA level, histone acetylation by acetyltransferases (HATs) causes an expansion of
Medicine in the medieval Islamic world include "A Dissertation on the causes of the Coryza which occurs in the spring when roses give forth their scent", a tract in which al-Razi discussed why it is that one contracts coryza or common cold by smelling roses during the spring season, and "Bur’al Sa’a" ("Instant cure") in which he named medicines which instantly cured certain diseases. "Ibn Sina", more commonly known in west as Avicenna was a Persian polymath and physician of the tenth and eleventh centuries. He was known for his scientific works, but especially his writing on medicine. He has been described as the "Father of