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Janssen Hooke
The microscope was invented in 1595, by Hans and Zacharias Janseen. Using a two lens sytem of an eyepiece, and an objective lens. This was the first compound microscope (it made use of more than one lens to magnify object). The Janssen microscope had a mignifying pwoer of approxematly 20x. 38 ilistrations of plant, animal and non-living objects were viewed through this microscope. -
The Microscope
A microscope is an instrument that produces images of things that are too little into huge so that they can be examined properly. A simple microscope could be a microscope that uses just one lens for magnification. It is the original style of the light magnifier. Van Leeuwenhoek’s microscopes consisted of atiny low single converging lens mounted on a brass plate with a screw mechanism to carry the sample or specimen to be inspected. -
Francesco Redi - Spontaneous Generation
In 1668, Francesco Redi questioned the belief that maggots appeared spontaneously from raw meat. He set out flakes containing raw meat, some were sealed, some were coated with gauze and a few were open. He believed that flys laid their eggs in their meat. Redi prepared this experiment to check his hypothesis. -
Francesco Redi Continued - Spontaneous Generation
He controlled the acess of the flies to the meat. Maggots were found solely within the flakes that were opened and accesable to the flies to lay eggs. Despite the proof the concept of spontanious generation still thrived. -
John Needleham - Spontaneous Generation
John Needleham boiled chicken stock and placed it within the flask and sealed it. Throughout this point in time everybody excepted the boiling of small organisms, since boiling was a standard methodology of removing substances that will create illness. However within the experiment micro-organisms still appeared. Victorious Needleham sugested that there was a life force that produced spontanious generation. -
Lazzaro Spallanzani - Spontaneous Generation
Lazzaro Spallanzani a physiologist, refuted to Needlehams claim and instead, proposed that there were microorganisms in the air. He repeated Needlehams experiment but drew off the air, nothing grew within the remaining broth. Critics instructed that each one physiologist had shown it had been that air was needed for a spontanious generation to occur, the idea of spontaneous generation continuing to be excepted. -
Robert Brown - Cell Theory
A Scotish scientist, Robert Brown discovered an important cell structure, the nucleus in his study of orchids. Brown noticed a small spot and later identified them as the nucleus. -
M.J. Schleiden - Cell Theory
A German prosfesor, M.J. Schleiden obsered witht he microscope that all plants were composed of cells and he proposed that nucleus was the stcucture that ws responsible for deveolpment of the cell over time. Schleiden reviwed his work wth his friend Theodor Schwann, who at the time was studying animal physoligy and looked for simmilarites between plant and animal tissue and found that they both had spots. Using this information they propsed that all plants and animals were composed of cells. -
Rudolf Virchow's - Cell Theory
The cell theory was later further extended by, Rudolf Virchow's statement that all cells arise only from pre-existing cells. The ceel theory applies to all living things regardless of their state shape, size or number of cells involved. -
Louis Pasteur Continued - Spontaneous Generation
However the flasks were tipped that the broth could reach the flask, but micro-organisms and other particles would get caught in the S bend. In conclusion along with his experiment, he was given the honor to form a speech at the University of Paris Scientist Soriee on April 7, 1864. -
Louis Pasteur - Spontaneous Generation
In 1864 Louis Pasteur submitted an experiment to the academy of sciences. He used the work in Needlehas and Sallanzani with a very important modification. Before boiling meat broth during a flask, Pasteur heated the neck of the flask associated bent it into an S form air might reach the broth however small organisms and alternative particles we have a tendency to get caught within the tube. -
How are they connected
With the development and improvement of the light microscope, the theory of the cell that organisms would be made of cells was confirmed as scientist were able to actually see cells in tissues placed under the microscope.
