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Birthdays, July 27

Today is the birthday of Friedrich Dorn, born in 1848, he was the first person to discover that a radioactive substance radon was emitted from radium. He called it emanation, it was renamed radon by an international body of scientists.

Today is also the birthday of Hans Fisher, born in 1881, he received the Nobel Prize in 1930 for his synthesis of bilirubin and haemin, he also investigated bile pigments, cholorophyll and pyrrole.

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Birthdays July 26

Today is the birthday of Robert Remak, born in 1815, he is responsible for the three germ layer tissue theory: endoderm, mesoderm and ectoderm. He also discovered unmyelinated nerve fibers in the heart that are now called Remak’s ganglia, he discovered that the origin of cells is by cell division of preexisting cells.

Paul Walden, born in 1863, invented the walden inversion in stereochemistry

And Lenka Kotkova, born in 1973, she discovered the asteroid, 60001 Adelka

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Birthdays, July 25

Today is the birthday of  Rosalind Franklin, born in 1920, her data on X-Ray diffraction of DNA led to the Watson and Crick discovery of the double helix. Unpublished drafts of her papers show that she had determined the structure of DNA, yet her work was only vaguely acknowledged.  She should get credit for the discovery of the DNA double helix, and someday she will.

Today is also the birthday of Christopher Scheiner, born in 1575, he was an astronomer, physicist and priest who invented the pantograph in 1603. This was an instrument which enlarge or reduce drawings to any scale.

David Douglas, born in 1799 was a Scottish botanist who introduced several hundred species of plants and shrubs to Great Britain and Europe, the Douglas fir tree is named  after him as well as many other plant species that have Douglas or Douglasii in the name. He died while climbing Mauna Kea in Hawaii when he fell into a pit trap and a bull fell on top of him, the location is called “Doctor’s Pit” in Hawaiian

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Today in Automobile History, July 23

Did you know that on this day in 1903, the Ford Motor Company sold its first car?

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Birthdays, July 23

Today is the birthday of Etienne Malus, born in 1775, he was a mathematician who studied geometric light.  Being a mathematician, he also studied line geometry and line systems called ray systems. He used these ray systems to prove Christiaan Huygen’s theory of light. His theory of double refraction of light in crystals was published in 1810.  He is probably best known for Malus’ Law giving the resultant intensity, when a polarizer is placed in the path of an incident light beam.

Today is also the birthday of

Walter Schottky, born in 1886 who invented the screen-grid vacuum tube

And Vladimir Prelog, born in 1906 who is famous for the Cahn, Ingold, Prelog sequence used in organic chemistry to name stereoisomers with an R/S descriptor, or an E/Z descriptor for double bonds. He is the source of anecdotes about almost all eminent chemists and his scientific opus encompasses over 400 works.

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