The Tryptophan Operon – A Repressible Operon System

The tryptophan (trp) operon system is a type of repressible operon system. It was worked out by Jacob and Monod in 1953. The 20 amino acids are required in large amounts for protein synthesis and E.coli can synthesize all of them. The genes for the enzymes needed to synthesize tryptophan are generally clustered in trp … Continue reading The Tryptophan Operon – A Repressible Operon System

Introduction to Restrictive Lung Diseases

Definition Restrictive lung diseases are usually chronic, diffused, lung interstitial diseases, usually effecting the most peripheral and delicate interstitium of the alveolar walls. What is pulmonary Interstitium? Pulmonary interstitium is composed of basement membranes of the alveolar epithelial cells, vascular endothelial cells, and the tissue between them, mostly made of elastic fibers, collagen, fibroblasts that … Continue reading Introduction to Restrictive Lung Diseases

The Human Genome Project

The genome is the ultimate source of information about an organism. Advances in genetic engineering techniques made it possible for the scientists to isolate and clone DNA pieces and determine nucleotide sequences of these genome. After the development of practical DNA sequencing methods, serious discussions began about the prospects for sequencing the entire 3 billion … Continue reading The Human Genome Project