Inventors and Scientific Discoveries

Casimir Funk discovered that certain substances were vital for life and coined the term 'vitamine' in 1912, later shortened to 'vitamin'. The name combines 'vita' (life) and 'amine' (a chemical group he thought these compounds contained). Funk's work on beriberi led to isolating thiamine (vitamin B1). Hopkins contributed to discovering vitamins but did not name them.

Meselson and Stahl (1958) experimentally demonstrated semi-conservative DNA replication using density gradient centrifugation with nitrogen isotopes (N-14 and N-15). They grew E. coli in heavy N-15 medium, then transferred to light N-14 medium. After each generation of replication, DNA showed intermediate density (one heavy and one light strand), proving semi-conservative replication. Sutton and Boveri worked on chromosome theory, Griffith discovered transformation, and Hershey-Chase proved DNA is genetic material.

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Mendel's findings were rediscoverd in 1900 by De Vries, Corren and Tschermk.

Gene mapping was first developed by Alfred Staurtevant.

J.J. Thomson discovered the electron in 1897 through cathode ray tube experiments, for which he received the Nobel Prize. Rutherford discovered the atomic nucleus, Chadwick discovered the neutron, and Dalton proposed the atomic theory but did not discover subatomic particles.

Ronald Ross discovered that malaria is transmitted by mosquitoes in 1897, for which he received the Nobel Prize in 1902. Alexander Fleming discovered penicillin, Louis Pasteur contributed to germ theory and vaccination, and the name 'Alexander Pastur' appears to be a confusion of the two.

X-rays were discovered by Wilhelm Conrad Röntgen in 1895 at the University of Würzburg in Germany. He received the first Nobel Prize in Physics in 1901 for this discovery, which revolutionized medical diagnosis and scientific research.

Albert Einstein proposed the theory of relativity in the early 20th century. Special relativity was published in 1905, describing the relationship between space and time. General relativity came in 1915, explaining gravity as the curvature of spacetime.

The term biotechnology was coined by Hungarian engineer Karoly Ereky in 1919.

Robert Hooke is correctly regarded as the father of cytology for his pioneering work with microscopes and his discovery of cells in 1665. He published 'Micrographia' and coined the term 'cell' after observing cork tissue. Da Vinci was an artist and inventor, not a cell biologist. Anton Van Leeuwenhoek was a pioneer in microscopy but came later and is known for observing microorganisms, not founding cytology.

Robert Hooke discovered cells in 1665 when he examined cork slices under a primitive microscope and observed tiny box-like structures. He coined the term 'cell' because they reminded him of monks' living quarters in a monastery. Leeuwenhoek was a great microscopist but his work came later and focused on microorganisms like bacteria and protozoa.

Von Mohl introduced the term 'protoplasm' in 1846 to describe the jelly-like living substance within cells. J.E. Purkinje had used the term 'protoplasma' earlier for animal embryo material, but Von Mohl established it for the living cellular content. Dujardin discovered 'sarcode' in protozoa. Hertwig was an embryologist. Max Schultz is not associated with this discovery.

Theodor Schwann (1839) and Matthias Schleiden (1838) jointly proposed the cell theory. Schleiden worked on plant cells, Schwann extended the ideas to animal cells. Rudolf Virchow later added the third tenet 'Omnis cellula e cellula' (all cells from pre-existing cells) in 1855. Dujardin and Max Schultz are not associated with the cell theory.

S.J. Singer and G.L. Nicolson proposed the Fluid Mosaic Model in 1972. It describes the membrane as a fluid bilayer of phospholipids with proteins embedded like mosaic tiles. The phospholipids can move laterally, giving flexibility. Robertson proposed the earlier 'unit membrane' model. Knoll and Ruska were electron microscopy pioneers.