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Janssen
Janssen was a spectacle maker that is credited with making the first microscope. He invented a quite primitive microscope, but it allowed future scientists to take his idea and refine it. The microscope lead to many discoveries regarding cell theory. His microscope looks like a metal cylinder with a hole in both ends. It enabled scientists to see things smaller than the eye could see. -
Van leeuwenhoek
He contributed to cell theory, he is known as the father of microbiology. His microscope resembles a small paddle with a screw for the handle. He saw the protozoa, or single-celled organisms which he called animalcules. -
Robert Hooke
Robert Hooke named cells because they looked like jail cells. He made his discovery in 1665. His discovery was not too accurate because he didn't see the nucleus. His microscope looked like a fat needle attached to a stand, and it allowed him to see smaller objects than ever before. -
Redi
Redi had a theory of spontaneous regeneration, which meant that cells will be created randomly from other things. He made an experiment to test the creation of maggots by putting fresh meat in two different jars. One jar was left open while the other was covered with a cloth. Much later, the open jar contained maggots, and the covered jar contained no maggots. Redi showed that the maggots came from fly eggs and helped to disprove spontaneous generation. -
Needham
Needham conducted an experiment in which he placed a broth into a bottle and heated the bottle to kill everything inside and sealed it. Days passed, and he saw that there was life in the broth, which had come from nothing. -
Pasteur
Pasteur designed an experiment to test whether Needham's theory was correct or not. He filled two containers with the same broth and boiled them to kill any bacteria or microorganisms. He then broke off one of the flask's top, leaving it exposed. The one that was not broken remained devoid of life, proving the theory of spontaneous generation inncorrect. -
Transmission Electron Microscope
This type of microscope works when a beam of electrons is sent through an ultra-thin specimen, interacting with the specimen as it traverses through it. This microscope also allows you to see better than the usual microscope. -
Scanning Electron Microscope
This microscope produces images of a specimen by scanning it with a beam of electrons. The atoms interact with the electrons in the sample, making various signals that show information about the sample's surface. -
Confocal Microscope
The Confocal microscope works using a laser beam that passes through a source of light and then is focused by an objective lens into a small focal point on the surface of a specimen. It allows the user to see specimens clear than the usual telescope.
