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What is the Hans and Zacharias Janssen Cell Theory?

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The cell theory states that the cell is the basic unit of life. Hans and Zacharias Jansen greatly contributed to the various parts of this theory by inventing the first microscope.

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The cell theory also states that all living organisms are composed of cells. Organisms can be unicellular or multicellular. The theory states that all cells arise from pre-existing cells, according to About.com. Zacharias Jansen, a Dutch spectacle maker, invented the first compound microscope around 1590. Hans Jansen, Zacharias's father, was believed to have assisted in the creation of this young scientist's invention. The first microscope consisted of three draw tubes with lenses inside the ends. This microscope was complex for its time. The design consisted of a bi-convex eyepiece lens and a plano-convex objective lens. Magnifying images was achieved by sliding the draw tube in or out while focusing on the sample. When the tubes were extended to the maximum length, the microscope was able to magnify a sample up to 10 times the original size. The invention of this scientific instrument allowed Robert Hooke and Anton van Leeuwenhoek, notable scientists of the late 17th century, to observe diatoms, fossils and the first cells. The invention of the compound microscope laid the foundation for the advancement in microscopy.

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  • Q:

    Who were Hans and Zacharias Janssen?

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    Hans and Zacharias Janssen were a Dutch father and son accredited with the creation of the first microscope. Both lived in the Netherlands and were working with each other as spectacle makers.

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  • Q:

    Who developed cell theory?

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    Cell theory was developed in the early 19th century by three German scientists, Theodor Schwann, Matthias Jacob Schleiden and Rudolf Virchow. While all three scientists contributed to the generally accepted classical cell theory, each hypothesized different sections of it and had parts of their theory refuted and replaced.

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  • Q:

    Who came up with the cell theory?

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    The cell theory, which is comprised of three different but related elements, was discovered and developed by Matthias Schleiden, Theodor Schwann and Rudolph Virchow. All three men were scientists in Germany who lived during the 1800s, but they did not work together to develop the theory.

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  • Q:

    Who were the cell theory scientists?

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    The cell theory scientists were Theodor Schwann and Matthias Jakob Schleiden. Schleiden suggested that all the different parts of plants are made of cells. Schwann came to the same conclusion as Schleiden and stated further that animals were also composed of cells.

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