Friedrich Miescher

Johan Friedrich Miescher (13 August 1844, Basel - 26 August 1895, Davos) was a Swiss biologist. He isolated various phosphate-rich chemicals, which he called nuclein (now nucleic acids), from the nuclei of white blood cells in 1869 at Felix Hoppe-Seyler's laboratory at the University of Tübingen, Germany, paving the way for the identification of DNA as the carrier of inheritance. The significance of the discovery, first published in 1871, was not at first apparent, and it was Albrecht Kossel who made the initial inquiries into its chemical structure. Friedrich Miescher PBS is Public Domain Copied from http://www. ... Friedrich Miescher PBS is Public Domain Copied from http://www. ... is the 225th day of the year (226th in leap years) in the Gregorian calendar. ... Jan. ... For other uses, see Basel (disambiguation). ... is the 238th day of the year (239th in leap years) in the Gregorian calendar. ... Year 1895 (MDCCCXCV) was a common year starting on Tuesday (link will display full calendar) of the Gregorian calendar (or a common year starting on Sunday of the 12-day-slower Julian calendar). ... Davos viewed from air Davos is a town in eastern Switzerland, in the canton of Graubünden, on the Landwasser River. ... A biologist is a scientist devoted to and producing results in biology through the study of organisms. ... Look up nucleic acid in Wiktionary, the free dictionary. ... White Blood Cells redirects here. ... 1869 (MDCCCLXIX) is a common year starting on Friday (link will take you to calendar) of the Gregorian calendar or a common year starting on Sunday of the 12-day-slower Julian calendar. ... 1825-1895, German physiologist and chemist. ... Tübingen, Neckar front Tübingen, a traditional university town of Baden-Württemberg, Germany, is situated 20 miles southwest of Stuttgart, on a ridge between the River Neckar and the Ammer. ... The structure of part of a DNA double helix Deoxyribonucleic acid, or DNA, is a nucleic acid molecule that contains the genetic instructions used in the development and functioning of all known living organisms. ... 1871 (MDCCCLXXI) was a common year starting on Sunday (see link for calendar). ... Ludwig Karl Martin Leonhard Albrecht Kossel (September 16, 1853 - July 5, German medical doctor. ...

Miescher came from a scientific family: his father and his uncle held the chair of anatomy at the University of Basel. As a boy he was shy but intelligent. He had a partial hearing impairment due to a severe attack of typhus. But this did not stop him from having an interest in music and his father performed publicly. Miescher himself studied medicine at Basel. In the summer of 1865 Friedrich worked for the organic chemist Adolf Stecker in Goettingen. His studies were interrupted for the year when he became ill with typhoid fever; however, he still received his M.D. in 1868. The University of Basel (German: Universität Basel) is located at Basel, Switzerland. ... For the unrelated disease caused by Salmonella typhi, see Typhoid fever. ...

Miescher felt that his partial deafness would be a disadvantage as a doctor so he turned to physiological chemistry. Miescher originally wanted to study lymphocytes but was encouraged by Felix Hoppe-Seyler to study leucocytes. Miescher was interested in studying the chemistry of the nucleus. Lymphocytes were difficult to obtain in sufficient enough numbers to study while leucocytes were known to be the one of the main components in pus and could be obtained from bandages at the nearby hospital. The problem was, however, washing the cells off the bandages without damaging them. A scanning electron microscope (SEM) image of a single human lymphocyte. ... 1825-1895, German physiologist and chemist. ... White Blood Cells is also the name of a White Stripes album. ... The nucleus of an atom is the very small dense region, of positive charge, in its centre consisting of nucleons (protons and neutrons). ...

Miescher devised different salt solutions eventually producing one with sodium sulfate. The cells were filtered. Since centrifuges were not present at this time the cells were allowed to settle at the bottom of a beaker. He then tried to isolate the nuclei free of cytoplasm. He subjected the purified nuclei to an alkaline extraction followed by acidification resulting in a precipitate being formed which Miescher called nuclein (now known as DNA). He found that this contained phosphorus, nitrogen, and sulfur. The discovery was so unlike anything else at the time that Hoppe-Seyler repeated all Miescher's research himself before publishing it in his journal. Friedrich then went on to study physiology at Leipzig in the laboratory of Carl Ludwig for a year before returning to Basel where he was appointed professor of physiology. The structure of part of a DNA double helix Deoxyribonucleic acid, or DNA, is a nucleic acid molecule that contains the genetic instructions used in the development and functioning of all known living organisms. ... 1825-1895, German physiologist and chemist. ...

Miescher and his students researched much of the nucleic acid chemistry but their function remained unknown. However, his discovery played an important part in the identification of nucleic acids as the carriers of inheritance. The importance of Miescher's discovery was not apparent until Albrecht Kossel (a German physiologist specializing in the physiological chemistry of the cell and its nucleus and of proteins) carried out research on the chemical structure of nuclein. Friedrich Miescher is also known for demonstrating that carbon dioxide concentrations in blood regulate breathing.

He died of tuberculosis in 1895 aged 51. He has had a laboratory of the Max Planck Society in Tübingen and a research institute in Basel named after him. Tuberculosis (abbreviated as TB for tubercle bacillus or Tuberculosis) is a common and deadly infectious disease caused by mycobacteria, mainly Mycobacterium tuberculosis. ... “Planck” redirects here. ... Tübingen, Neckar front Tübingen, a traditional university town of Baden-Württemberg, Germany, is situated 20 miles southwest of Stuttgart, on a ridge between the River Neckar and the Ammer. ... For other uses, see Basel (disambiguation). ...

References

• Short biography and bibliography in the Virtual Laboratory of the Max Planck Institute for the History of Science
• FMI - Friedrich Miescher Institute
• The Friedrich Miescher Laboratory of the Max Planck Society
• Lasker Foundation
• FMI - DNA Pioneers and Their Legacy by Ulf Lagerkvist
• Miescher, Friedrich (1871). "Ueber die chemische Zusammensetzung der Eiterzellen". Med.-Chem. Unters. 4: 441–460.
• Ralf Dahm (2005). "Friedrich Miescher and the discovery of DNA". Developmental Biology 278 (2): 274-288. doi:10.1016/j.ydbio.2004.11.028.
• Jesse P. Greenstein (1943). "Friedrich Miescher, 1844-1895". The Scientific Monthly 57 (5): 523-532.
• Florian Maderspacher (2004). "Rags before the riches: Friedrich Miescher and the discovery of DNA". Current Biology 14 (15): R608. doi:10.1016/j.cub.2004.07.039.
• Meyer Friedman and Gerald W. Friedland, Medicine's 10 Greatest Discoveries, ISBN 0-300-08278-9, pp.194-196.