BRMW is a free open source entity-relationship database modeling tool. We're working to make learning database modeling simple and accessible for everyone.
The heart is a fist-sized organ in the chest that is responsible for pumping blood. It has four chambers: two upper chambers (atria) and two lower chambers (ventricles). These chambers are separated ...
These drawings, which first appeared in the journal Advances in Protein Chemistry in 1981, became known as ribbon diagrams. Richardson’s drawing ... Proteins are minuscule, on the order of nanometers, ...