Neurohormones were first identified by Otto Loewi in 1921.

* 1873 – Otto Loewi, German pharmacologist, Nobel Prize laureate ( d. 1961 )

The presence of such a gap suggested communication via chemical messengers traversing the synaptic cleft, and in 1921 German pharmacologist Otto Loewi ( 1873 – 1961 ) confirmed that neurons can communicate by releasing chemicals.

Furthermore, Otto Loewi is accredited with discovering acetylcholine ( ACh )— the first known neurotransmitter.

* December 25 – Otto Loewi, German-born pharmacologist, recipient of the Nobel Prize in Physiology or Medicine ( b. 1873 )

* Physiology or Medicine – Sir Henry Hallett Dale, Otto Loewi

* June 3 – Otto Loewi, German-born pharmacologist, recipient of the Nobel Prize in Physiology or Medicine ( d. 1961 )

At this location, neuroscientist Otto Loewi first proved that nerves secrete substances called neurotransmitters, which have effects on receptors in target tissues.

Nobel Prize Laureates who taught at the University of Vienna include Robert Bárány, Julius Wagner-Jauregg, Hans Fischer, Karl Landsteiner, Erwin Schrödinger, Victor Franz Hess, Otto Loewi, Konrad Lorenz and Friedrich Hayek.

For his study of acetylcholine as agent in the chemical transmission of nerve impulses ( neurotransmission ) he shared the 1936 Nobel Prize in Physiology or Medicine with Otto Loewi.

While working at the University College London he met and became friends with Otto Loewi.

Carl was invited to Graz to work with Otto Loewi to study the effect of the vagus nerve on the heart, Loewi would receive the Nobel Prize in Physiology or Medicine in 1936 for this work.

Nobel Laureate Otto Loewi taught at the University of Graz from 1909 until 1938.

* Otto Loewi, 1936 in medicine – in Graz 1909 to 1938

* Otto Loewi

Otto Loewi ( 3 June 1873 – 25 December 1961 ) was a German born pharmacologist whose discovery of acetylcholine helped enhance medical therapy.

The Nobel Prize diploma of Otto Loewi, housed at the University of Graz

* Otto Loewi Biography.

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Otto von Bismarck in 1873.

** Otto Harbach, American lyricist and librettist ( b. 1873 )

Under the threat of violence, on 25 November 1934 rector Otto Grosser ( 1873 – 1951 ) handed over the insigniae.

Otto Abels Harbach, born Otto Abels Hauerbach ( August 18, 1873 – January 24, 1963 ) was an American lyricist and librettist of about 50 musical comedies.

* February 6 – Otto Mahler, composer ( born 1873 ) ( suicide )

Image: Otto von Bismarck 1873. jpg | Otto von Bismarck, " Iron Chancellor " of the second German Empire

His enthusiasm for the subject was so great that he traveled to Germany in July 1930 to meet with Hugo Otto Georg Hans Westphal ( August 26, 1873 – September 15, 1934 ), a great-grandson of Accum's.

That same year, Elisabeth met Prince Otto Weriand von Windisch-Grätz ( 1873 – 1952 ) at a court ball.

* Otto Nyberg 1873 – 1879

Princess Stéphanie of Windisch-Graetz ( Ploskovice, Bohemia April 4, 1909 – Uccle ( Belgium ) May 29, 2005 ) was the daughter of Prince Otto Weriand of Windisch-Grätz ( 1873 – 1952 ) and Archduchess Elisabeth Marie of Austria ( 1883 – 1963 ), only child of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium.

As Minister of War 1859 – 1873 Roon, along with Otto von Bismarck and Helmuth von Moltke, was a dominating figure in Prussia's government during the key decade of the 1860s, when a series of successful wars against Denmark, Austria and France led to German unification under Prussia's leadership.

On 22 October 1873, German Chancellor Otto von Bismarck negotiated an agreement between the monarchs of Austria – Hungary, Russia and Germany.

* Hannah More Macaulay ( 1810 – 1873 ) who married Sir Charles Trevelyan and was the mother of Sir George Otto Trevelyan

Otto Wels ( 15 September 1873 – September 16, 1939 ) was the chairman of the Social Democratic Party of Germany ( SPD ) from 1919 and a member of parliament from 1920 to 1933.

Carl Otto Lampland ( December 29, 1873 – December 14, 1951 ) was an American astronomer.

In conjunction with Wattenbach he completed the Monumenta Alcuiniana ( Berlin, 1873 ), which had been begun by Philipp Jaffé, and with Rudolf Köpke he wrote Kaiser Otto der Grosse ( Leipzig, 1876 ).

Krøyer, their homes were gathering places for such other contemporary artists as authors Holger Drachmann ( 1846 – 1908 ), Herman Bang ( 1857 – 1912 ) and Henrik Pontoppidan ( 1857 – 1943 ) and painters Wilhelm Marstrand ( 1810 – 1873 ), Frederik Vermehren ( 1823 – 1910 ), Otto Bache ( 1839 – 1927 ), Kristian Zahrtmann ( 1843 – 1917 ), and Frants Henningsen ( 1850 – 1908 ).

The best known of his works is his biography of Prince Otto von Bismarck ( Das Buch vom Fursten Bismarck ) ( 3rd ed., 1873 ; English trans.