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First Microscope
Hans and Zacharias Janssen created it by placing two lenses in a tube. -
Antoine Van Leeuwenhoek
Died: August 26, 1723
Known for: Discovery of protozoa, First red blood cell description -
Robert Hooke
Died: March 3, 1706
Known for: Hooke's Law, Microscopy, applied the word 'cell' -
Discovery of the Nucleus
The nucleus (plural nuclei) is an organelle found inside cells that is enclosed in an impermeable membrane. It contains strings of genetic information, called chromosomes. Most cells have one nucleus, however others have either no nuclei or several nuclei. The nucleus is the largest cell organelle in animal cells, with an average diameter being approximately 6 micrometers (1 micrometer = 0.0001 cm.) . It appears as a dense, roughly round organelle. -
Discovery of Nucleus (continued)
The nucleus was the first organelle to be discovered. It is most likely that Antonie van Leeuwenhoek discovered it while looking through a microscope in 1719 (an animal cell). The nucleus was also described by Franz Bauer in 1804 and in 1831 by Robert Brown in more detail (a plant cell). In 1838, Matthias Schleiden proposed that the nucleus plays a role in generating cells. Its function was decided that it controls the activities of the rest of the cell and store genes. -
Matthias Schleiden
Died: June 23, 1881
Known for: Co-Creating the cell theory -
Theodor Schwann
Died: January 11, 1882
Known for: Cell Theory, Schwann Cells -
Rudolf Virchow
Died: September 5, 1902
Known for: Cellular pathology -
Cell Theory
All living things have cells
All cells are made up of/come from pre-existing cells
Cells are the basic structure of living things
The wellbeing of an organism depends on the wellbeing of its cells.
Cell Theory by Robert Hooke, Matthias chleiden, and Theodor Schwann -
Electron Microscope
Max Knoll and Ernst Ruska created it, however Ernst Ruska created an electron microscope with an increased magnification in 1933. The magnification has since been improved.
Electron microscopes can have a magnification of up to
10 000 000x and use beams of electrons to magnify and illuminate the specimen. -
Digital Microscope
Invented in Toyko, Japan
A microscope with a camera on it, which is attached to a computer monitor. There are usually no eyepieces on the microscope. The magnification is changed by how many times the speciman/image can be "zoomed in on" or "reproduced" on the computer monitor.
The sample can be viewed in 2D or 3D.
