Duclaux, Émile

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Duclaux, Émile Gender: M
Pierre-Émile Duclaux
born on 24 June 1840 at 17:00 (= 5:00 PM )
Place Aurillac, France, 44n56, 2e26
Timezone LMT m2e26 (is local mean time)
Data source
BC/BR in hand
Rodden Rating AA
Collector: Scholfield
Astrology data s_su.18.gif s_cancol.18.gif 03°08' s_mo.18.gif s_aricol.18.gif 25°11 Asc.s_scocol.18.gif 28°55'

Émile Duclaux (1890)


French microbiologist and chemist who, for much of his career, was associated with the work of Louis Pasteur. Duclaux's work was largely in the fields of chemistry, bacteriology, hygiene and agriculture. He initiated the custom of naming enzymes by adding the suffix "-ase" to the enzyme's substrate. With Pasteur, he collaborated in the study of silkworm diseases, and also took part in experiments to debunk the theory of spontaneous generation. In the 1870s, he undertook studies of phylloxera, an aphid-like pest that plagued grape vineyards. In addition, he performed research on the composition of milk, and conducted studies on beer and wine.

He studied at the College of Aurillac, the Lycée Saint-Louis in Paris and at École Normale Supérieure. In 1862 he began work as an assistant in the laboratory of Pasteur (1822–1895). During his career, he taught classes in Tours (1865), Clermont-Ferrand (1866), Lyon (from 1873) and Paris (from 1878). In Paris, he was a professor of meteorology at the Institute of Agronomy.

In 1887, he began publication of the Annales de l'Institut Pasteur, with Charles Chamberland (1851-1908), Jacques-Joseph Grancher (1843–1907), Edmond Nocard (1850–1903) and Pierre Paul Émile Roux (1853–1933) as members of the first editorial board. Following Pasteur's death in 1895, Duclaux became director of the Institute, with Roux and Chamberland serving as its sub-directors.

Duclaux was a prolific writer, some of his better known publications were Traité de microbiologie, L'hygiène sociale, Ferments et maladies and Pasteur, histoire d'un esprit, the latter being a biography dedicated to Pasteur.

Being actively involved in French politics, he was a vocal supporter of Alfred Dreyfus (1859-1935), when the latter was unjustly accused of treason. Duclaux's second wife, Agnes Mary Frances Duclaux (maiden name Agnes Mary Frances Robinson 1857–1944), was a well-known author, and his son, Jacques Eugène Duclaux (1877–1978), was a highly regarded chemist.

He died on 2 May 1904, aged 63, in Paris.

Link to Wikipedia biography


  • business associate/partner relationship with Pasteur, Louis (born 27 December 1822)


  • Relationship : Marriage 1873 (Mathilde Briot)
  • Death of Mate 1880 (Mathilde Briot)
  • Relationship : Marriage 10 January 1901 (Agnes Mary France(s) Robinson)
    chart Placidus Equal_H.

Source Notes

Sy Scholfield submitted birth certificate (acte n°198) from the online Cantal archives: "cinq heures du soir" (5pm). Data for 2nd marriage in margin.

Grazia Bordoni's Science file quotes Lescaut for same data.


  • Family : Relationship : Mate - Noted (2nd wife)
  • Family : Relationship : Number of Marriages (Two)
  • Family : Parenting : Kids 1-3 (Three, all with 1st wife)
  • Vocation : Education : Teacher
  • Vocation : Science : Chemistry (Microbiologist)
  • Vocation : Writers : Biographer (Louis Pasteur)
  • Vocation : Writers : Textbook/ Non-fiction