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Harald Sack

astronomy
William Lassell and the Discovery of Triton

William Lassell and the Discovery of Triton

Harald Sack
On October 10, 1846, English merchant and astronomer William Lassell discovered Triton, the largest moon of Neptune, just 17 days after the discovery of Neptune itself by German astronomer Johann Gottfried Galle. Besides, Lassell also discovered Ariel and Umbriel, two moons of planet Uranus [3], as well the Saturn moon Hyperion. Triton – A very special Satellite Lassell started a brewery business about 1825, after a seven-year apprenticeship. He became interested in astronomy…
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chemistry
Henry Louis Le Châtelier and the Le Châtelier Principle

Henry Louis Le Châtelier and the Le Châtelier Principle

Harald Sack
On October 8, 1850, French chemist Henry Louis Le Chatelier was born. Le Châtelier is most famous for devising Le Chatelier’s principle, with the help of his partner Jasper Rossi, used by chemists to predict the effect a changing condition has on a system in chemical equilibrium. Youth and Education Le Châtelier was born in Paris, France, the first of six children [1] of French materials engineer Louis Le Chatelier, an influential figure…
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chemistry
Florence Seibert and the Tuberculosis Test

Florence Seibert and the Tuberculosis Test

Harald Sack
On October 6, 1897, American biochemist Florence Barbara Seibert was born. Seibert is best known for identifying the active agent in the antigen tuberculin as a protein, and subsequently for isolating a pure form of tuberculin, purified protein derivative (PPD), enabling the development and use of a reliable TB test. Youth and Education Seibert was born in Easton, Pennsylvania, USA, the second of three children of George Peter Seibert, a rug manufacturer…
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biology
Edward Murray East and the Hybrid Corn

Edward Murray East and the Hybrid Corn

Harald Sack
On October 4, 1879, American plant geneticist, botanist, agronomist and eugenisist Edward Murray East was born. East is known for his experiments that led to the development of hybrid corn and his support of ‘forced’ elimination of the ‘unfit’ based on eugenic findings. “Genetics has enticed a great many explorers during the past two decades. They have labored with fruit-flies and guinea-pigs, with sweet peas and corn, with thousands of animals and…
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chemistry
Alexander Todd and the Chemistry of Nucleotide Coenzymes

Alexander Todd and the Chemistry of Nucleotide Coenzymes

Harald Sack
On October 2, 1907, British chemist and Nobel laureate Alexander Robertus Todd, Baron Todd was born. Todd‘s research on the structure and synthesis of nucleotides, nucleosides, and nucleotide coenzymes gained him the Nobel Prize for Chemistry. Youth and Education Alexander R. Todd was born near Glasgow, Scotland, the elder son of Alexander Todd, a business man of that city, and his wife Jean Lowrie. In 1918 Todd gained admission to the Allan…
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history
Themistokles and the Battle of Salamis

Themistokles and the Battle of Salamis

Harald Sack
On September 29, 480 BC, the Battle of Salamis took place, a naval battle between the Greek city-states under Themistocles and the Persian Empire under King Xerxes, which marked the high-point of the second Persian invasion of Greece. Herodotus – the Father of History Our main source for the Greco-Persian Wars is the Greek historian Herodotus, often referred to as the ‘Father of History’.[1] The Greek city-states of Athens and Eretria had…
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physics
Paul Villard and the Gamma Radiation

Paul Villard and the Gamma Radiation

Harald Sack
On September 28, 1860, French chemist and physicist Paul Ulrich Villard was born. Villard is best known for having discovered gamma rays in 1900 while studying the radiation emanating from radium. Paul Villard – Youth and Education Paul Villard was born in Saint-Germain-au-Mont-d’Or, Rhône, France. Villard entered the École Normal Supérieure in 1881 and received the agrégé in 1884, which gave him the license to teach at any secondary school financed by…
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chemistry
Harrison Brown and the Isolation of Plutonium

Harrison Brown and the Isolation of Plutonium

Harald Sack
On September 26, 1916, American nuclear chemist and geochemist Harrison Scott Brown was born. Brown is generally known for his role in isolating plutonium for its use in the first atomic bombs and for his studies regarding meteorites and the Earth’s origin. He also was a political activist, who lectured and wrote on the issues of arms limitation, natural resources and world hunger. Harrison Brown – Youth and Education Harrison Brown was…
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biology
Severo Ochoa and the Biological Systhesis of RNA and DNA

Severo Ochoa and the Biological Systhesis of RNA and DNA

Harald Sack
On September 24, 1905, Spanish physicist and biochemist Severo Ochoa de Albornoz was born. Ochoa received the 1959 Nobel Prize in Physiology or Medicine together with Arthur Kornberg for their discovery of the mechanisms in the biological synthesis of ribonucleic acid and deoxyribonucleic acid. Severo Ochoa – Early Years Severo Ochoa was born in Luarca (Asturias), Spain, to Severo Manuel Ochoa, a lawyer and businessman, and his mother Carmen de Albornoz. Ochoa…
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biology
George Stapledon and Grassland Science

George Stapledon and Grassland Science

Harald Sack
On September 22, 1882, English grassland scientist and pioneer environmentalist Sir Reginald George Stapledon was born. Stapledon worked to compensate for the land use changes of the 20th century, after the collapse of rural mining industries of 18th and 19th centuries and resultant depopulation. Reginald George Stapledon – Background Reginald George Stapledon was born at Lakenham, Northam, near Bideford, Devon, UK, the sixth of the seven children of shipping agent William Stapledon…
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