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Paul Ehrlich (German: [ˈpaʊl ˈʔeːɐ̯lɪç] ⓘ; 14 March 1854 – 20 August 1915) was a Nobel Prize-winning German physician and scientist who worked in the fields of hematology, immunology and antimicrobial chemotherapy. Among his foremost achievements were finding a cure for syphilis in 1909 and inventing an important modification of the technique for Gram staining bacteria. The methods he developed for staining tissue made it possible to distinguish between different types of blood cells, which led to the ability to diagnose numerous blood diseases. His laboratory discovered arsphenamine (Salvarsan), the first antimicrobial drug and first effective medicinal treatment for syphilis, thereby initiating and also naming the concept of chemotherapy. Ehrlich introduced the concept of a magic bullet. He also made a decisive contribution to the development of an antiserum to combat diphtheria and conceived a method for standardising therapeutic serums. In 1908, he received the Nobel Prize in Physiology or Medicine for his contributions to immunology. He was the founder and first director of the Paul Ehrlich Institute, a German research institution and medical regulatory body named for him in 1947, that is the nation's federal institute for vaccines and biomedicines. A genus of Rickettsiales bacteria, Ehrlichia, is named after him.
Trying to separate the contributions of nature and nurture to an attribute is rather like trying to separate the contributions of length and width to the area of a rectangle, which at first glance also seems easy. When you think about it carefully, though, it proves impossible.
Few problems are less recognized, but more important than, the accelerating disappearance of the earth's biological resources. In pushing other species to extinction, humanity is busy sawing off the limb on which it is perched.