The various preparations of insulin available for prescription vary in onset, intensity, and duration of action. Animal source insulins, pork and beef, have been discontinued in the U.S. market. Human insulin is derived by recombinant DNA technology and is termed quick acting, intermediate acting, or long acting.
The pole lathe was invented sometime before the 13th century AD. Although it represented a great advance the pole lathe was not that much more complicated than its predecessors. The differences consisted of a framework to raise the bed of the lathe clear of the ground, the addition of a pole and a treadle.
Two years later, Latimer would play a part in one of the worldâs most important inventions. In 1876, Latimer was sought out as a draftsman by an instructor for hard of hearing children. The teacher had created a device and needed Lewis to draft the drawing necessary for a patent application. The instructor was Alexander Graham Bell and the product was the telephone.