Joan Oró

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Joan Oró i Florensa (1923–2004) was a Spanish-Catalan biochemist whose work helped explain how life began. He spent many years in the United States and worked on NASA missions, including the Viking mission to Mars. He received the Oparin Medal for his contributions to origin-of-life research.

Early life and education
Joan Oró was born on 26 October 1923 in Lleida, Catalonia, Spain, as the youngest of five children. The Spanish Civil War delayed his schooling, but he later studied chemistry with a focus on organic chemistry at the University of Barcelona, finishing in 1947. To make ends meet, he spent three years working at his father’s bakery. In 1952, he and his family moved to the United States because scientific opportunities in Spain were limited at the time.

In the United States, he began graduate studies at the Rice Institute in Houston. After meeting biochemist Donald Rappoport, he switched to biochemistry and earned his PhD in biochemistry in 1956 at Baylor College of Medicine.

Scientific career
Oró became a full professor at the University of Houston in 1963, where he founded and directed the department of biochemistry and biophysics. From the 1960s he worked with NASA on the Viking missions to Mars.

Key discoveries and ideas
- Oró helped analyze Martian soil samples from the Viking mission and offered an abiotic explanation (chemical reactions that do not involve life) for the observed release of carbon dioxide, rather than microbial metabolism.
- He made important contributions to prebiotic chemistry. Between 1959 and 1962 he showed that the nucleobase adenine could be synthesized from hydrogen cyanide (HCN) and that amino acids could be formed from HCN and ammonia in water. These results, alongside the Miller–Urey experiments, are foundational to ideas about how life’s building blocks could form on the early Earth.
- Oró proposed that comets could be carriers of organic molecules to the early Earth. This idea is widely accepted today. In 1971 he and colleagues reported the presence of amino acids and hydrocarbons in the Murchison meteorite and studied their optical activity.

Other roles
Oró was also active in public life after Spain’s transition to democracy, serving in the Parliament of Catalonia. He acted as a science advisor for many American projects and committees, including those related to the International Space Station and future Mars missions.

Personal life and legacy
Oró married Francesca Forteza in 1948, and they had four children. He passed away on 2 September 2004 in Barcelona, Spain. His work earned him the Oparin Medal for contributions to the study of the origins of life.