what is the achievement of Cornelius Van Niel ?
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Van Niel was the first biologist to receive the American National Medal of Science;[6] he was awarded the 1963 Medal in biological sciences for "his fundamental investigations of the comparative biochemistry of microorganisms, for his studies of the basic mechanisms of photosynthesis, and for his excellence as a teacher of many scientists."[7]Additional awards include:
1955: Marjory Stephenson Prize of theSociety for General Microbiology1966: Charles F. Kettering Award of theAmerican Society of Plant Biologists1967: Rumford Prize1970: Leeuwenhoek Medal
In 1950 van Niel became a correspondent of the Royal Netherlands Academy of Arts and Sciences. studying purple sulfur bacteria and green sulfur bacteria he was the first scientist to demonstrate that photosynthesis is a light-dependent redox reaction in 1931,[2] in whichhydrogen from an oxidizable compoundreduces carbon dioxide to cellular materials. Expressed as:
2 H2A + CO2 → 2A + CH2O + H2O
where A is the electron acceptor. His discovery predicted that H2O is the hydrogen donor in green plant photosynthesis and is oxidized to O2. The chemical summation of photosynthesis was a milestone in the understanding of the chemistry of photosynthesis. This was later experimentally verified by Robert Hill.
In a nutshell, van Niel proved that plants give off oxygen as a result of splitting water molecules during photosynthesis, not carbon dioxide molecules as thought before.
Bacterial taxonomyEdit
Van Niel also played a key role in the development of bacterial taxonomy.[1] In 1962, van Niel in collaboration with Roger Y. Stanier defined prokaryotes as cells in which the nuclear material is not surrounded by anuclear membrane, a definition that is still used to date.[3]
TeachingEdit
Shortly after his arrival at Hopkins Marine Station, van Niel developed a course in general microbiology which was to become widely influential.[1] During its run from 1938 to 1962, the course drew students from around the world, and included several accomplished scientists among its alumni, including Esther Lederberg and Allan Campbell.[4][5] and Arthur Kornberg, the recipient of the 1959 Nobel prize for DNA synthesis.
1955: Marjory Stephenson Prize of theSociety for General Microbiology1966: Charles F. Kettering Award of theAmerican Society of Plant Biologists1967: Rumford Prize1970: Leeuwenhoek Medal
In 1950 van Niel became a correspondent of the Royal Netherlands Academy of Arts and Sciences. studying purple sulfur bacteria and green sulfur bacteria he was the first scientist to demonstrate that photosynthesis is a light-dependent redox reaction in 1931,[2] in whichhydrogen from an oxidizable compoundreduces carbon dioxide to cellular materials. Expressed as:
2 H2A + CO2 → 2A + CH2O + H2O
where A is the electron acceptor. His discovery predicted that H2O is the hydrogen donor in green plant photosynthesis and is oxidized to O2. The chemical summation of photosynthesis was a milestone in the understanding of the chemistry of photosynthesis. This was later experimentally verified by Robert Hill.
In a nutshell, van Niel proved that plants give off oxygen as a result of splitting water molecules during photosynthesis, not carbon dioxide molecules as thought before.
Bacterial taxonomyEdit
Van Niel also played a key role in the development of bacterial taxonomy.[1] In 1962, van Niel in collaboration with Roger Y. Stanier defined prokaryotes as cells in which the nuclear material is not surrounded by anuclear membrane, a definition that is still used to date.[3]
TeachingEdit
Shortly after his arrival at Hopkins Marine Station, van Niel developed a course in general microbiology which was to become widely influential.[1] During its run from 1938 to 1962, the course drew students from around the world, and included several accomplished scientists among its alumni, including Esther Lederberg and Allan Campbell.[4][5] and Arthur Kornberg, the recipient of the 1959 Nobel prize for DNA synthesis.
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he discovered that plants prepare there own food by process of photosynthesis
he even formulated the simple equation
that is,
CO2+H2O = (CH2O)2 +O2 in presence of sunlight and chlorophyll
he even formulated the simple equation
that is,
CO2+H2O = (CH2O)2 +O2 in presence of sunlight and chlorophyll
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