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The creation of the first microscope.
Both Hans and Zacharias are sometimes credited with the creation becuase Hans influenced Zacharias' thinking so much.
The first microscope was just a tube with a few pieces of glass in it.
Zacharias noticed that he could see the object at the end of the tube and it was very enlarged. -
Marcello was the first person to see red blood cells through a microscope and attributed to the color of them.
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Robert Hooke saw the first cells in a thin slice of cork. He was also the person who gave them their name, "cell."
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Conducted experiments that were controlled. He found that living things can not just "appear." They come from other living things.
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van Leeuvenhoek was the first person to observe bacteria and protozoa. He discovered that there is microscopic life that can only be seen through a microscope.
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Brown discovered that there is a nucleous in a plant cell.
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Schwann discovered the digestive enzyme. He named it, pepsin. He extended Schleiden's cell theory to animals. He also beleived that cells come from existing cells.
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He found that the different parts of the plant organism are cells. He also recognized the important of the cell nucleous. Also he was the co-founder of the cell theory.
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Virchow disproved the previous cause of the inflamation of a vein causing disease. He used the cell theory to descibe the effects of disease in the tissues and in organs. He stated that disease do not come from tissues or organs in general rather than the indivual cells themselves.
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Mendel is often refered to as, "the father of modern genetics." He discovered the principles of heriditary. His experiments led to the study of heriditary in people from him studies on peas.
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He used dye to stain the embyos of a slamander. He then found that there were threadlike materials he could see when the cells started to divide. Those threadlike materials were chromosomes. This was important for later work in meisos and the chromosonal theory of inheritance.
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Morgan did numerous experiments on fruit flies. From those experiments he established/confirmed the chromosome theory of heredity. He found that genes are linked in a series of chromosomes and are responsible for prominate, hereditary traits.
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Together, these two discovered the structure of DNA. DNA is responsible for all hereditary control of life functions. This was the cornerstone for all genetic studies after the structure was discovered.
