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Zacharias Janssen; also Zacharias Jansen or Sacharias Jansen; 1585 – pre-1632 [1]) was a Dutch spectacle-maker who lived most of his life in Middelburg.He is associated with the invention of the first optical telescope and/or the first truly compound microscope, but these claims (made 20 years after his death) may be fabrications put forward by his son.
From these conclusions about plants and animals, two of the three tenets of cell theory were postulated. 1. All living organisms are composed of one or more cells 2. The cell is the most basic unit of life. Schleiden's theory of free cell formation through crystallization was refuted in the 1850s by Robert Remak, Rudolf Virchow, and Albert ...
However, the Alpher–Bethe–Gamow theory does correctly explain the relative abundances of the isotopes of hydrogen and helium. Taken together, these account for more than 99% of the baryonic mass of the universe. Today, nucleosynthesis is widely considered to have taken place in two stages: formation of hydrogen and helium according to the ...
The cell is the unit of structure, physiology, and organization in living things. [32] The cell retains a dual existence as a distinct entity and a building block in the construction of organisms. [32] By the 1860s, these tenets were the accepted basis of cell theory, used to describe the elementary anatomical composition of plants and animals. [3]
Illustration of Virchow's cell theory. Virchow is credited with several key discoveries. His most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He was one of the first to accept the work of Robert Remak, who showed that the origin of cells was the division of pre-existing cells. [29]
Again claims revolve around the spectacle making centers in the Netherlands including claims it was invented in 1590 by Zacharias Janssen and/or his father, Hans Martens, [53] [54] [55] claims it was invented by rival spectacle maker, Hans Lippershey, [56] and claims it was invented by expatriate Cornelis Drebbel who was noted to have a version ...
By 2003, Mallinson, then in his late teens, had been downloading and comparing Jackson and Sonic tracks for years. That September, he explained his Sonic/Jackson conspiracy theory in a post on Sonic Classic, one of the countless message board communities that dominated early-2000s Internet culture.
1590: earliest date of a claimed Hans Martens/Zacharias Janssen invention of the compound microscope (claim made in 1655). [3] [4] After 1609: Galileo Galilei is described as being able to close focus his telescope to view small objects close up [5] and/or looking through the wrong end in reverse to magnify small objects. [6]