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Biology Timeline

By Joe456
  • Janssen

    Jansenn invented the first primitive microscope, although it wasn't very effective. It still allowed future scientists to view inside the cell. The microscope looked like a cylinder made of metal with one hole on each end. It allowed future scientists to see things that have never being seen before. The microscope was used by Hooke to discover the cell.
  • Van leeuwenhoek

    Van Leeuwenhoek created a microscope which was able to zoom to a length pf 270 times, greater than anything during the time. His microscope was considered the first practical microscope. Leeuwenhoek was the first to describe what bacteria looked like. His microscope resembled a small paddle which had a screw for a handle.
  • Hooke

    Robert Hooke discovered the cell in 1665. He saw very small pores that resemble the cells in which monks at the monastery lived in. Hooke discovery was not very accurate because he did not find any evidence o the nucleus of organelles withing the cell. Hooke discovered the first known micro-organism. His microscope resembled a large needle, it allowed to see further with more resolution than ever before into things that are unseen to the human eye.
  • Redi

    Redi's theory of spontaneous regeneration states that cells will be created randomly from other things. His experiment involves three things of meat, one was in a covered jar another in a semi covered jar and another was completely open. The completely open jar has maggots in the meat, the other two did not. His experiment showed how cells can be created from other things.
  • Needham and Pasteur

    They both demonstrated that spontaneous generation did not occur. There experiments involved heating mean in a container that had a "S" shaped entrance that did not permit living organisms to enter. After a few days, the meat showed no signs of living things. For the next test bugs were allowed to enter the meat, however it would be difficult. The meat showed signs of living things growing in it. The test revealed that spontaneous generation did not exist.
  • Electron Micrscopy

    The two types. TEM- a beam of electrons passes through a thing part of stained tissue. The electron that touch the tissue are transformed to a digital image on a computer. It can view images up to 1 500 000 times. SEM- this technology gives info about the surface of a organism. The specimen being viewed is covered in a electron- dense material such as gold, this reflects electrons. While the beam reflects off the specimen a 3D image is formed. it can operate up to a zoom of 300 000 times.
  • Confocal technology

    Confocal technology has made it possible to view cells like never before. In a confocal microscope, a laser sends light onto the object or organism that is being viewed. The laser passes through the confocal pinhole which converts the light into an image. When the views are combined by a computer you can view them in a three dimensional format.