Jan Zaleski was a Polish

Poland

Poland , officially the Republic of Poland , is a country in Central Europe bordered by Germany to the west; the Czech Republic and Slovakia to the south; Ukraine, Belarus and Lithuania to the east; and the Baltic Sea and Kaliningrad Oblast, a Russian exclave, to the north...

 biochemist

Biochemist

Biochemists are scientists who are trained in biochemistry. Typical biochemists study chemical processes and chemical transformations in living organisms. The prefix of "bio" in "biochemist" can be understood as a fusion of "biological chemist."-Role:...

. Zaleski was a professor of the Agricultural University of Dublany (1904–1907), professor of the Warsaw University (since 1922) and a member of the Polish Academy of Learning

Polish Academy of Learning

The Polish Academy of Arts and Sciences or Polish Academy of Learning , headquartered in Kraków, is one of two institutions in contemporary Poland having the nature of an academy of sciences....

 (since 1921).

Between 1895 and 1901 he co-operated with Marceli Nencki

Marceli Nencki

Wilhelm Marceli Nencki was a famous Polish chemist and doctor.-Work:Nencki's main scientific interest concentrated on urea synthesis, the chemistry of purines and biological oxidation of aromatic compounds. He was also interested in the structure of proteins, enzymatic processes in the intestine...

 in research about the content of ammonia

Ammonia

Ammonia is a compound of nitrogen and hydrogen with the formula . It is a colourless gas with a characteristic pungent odour. Ammonia contributes significantly to the nutritional needs of terrestrial organisms by serving as a precursor to food and fertilizers. Ammonia, either directly or...

 in blood and conversions of blood pigment. In 1907 Zaleski published an empirical formula of mesoporphyrin. He is a co-author (with K. Lindenfeld) of a method to obtain a haemin.

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