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Zacharias Janssen's microscope
Zacharias Janssen is generally believed to be the first person to invent the compound microscope.his father, Hans, must have played an important role in the creation of the instrument. There would many debates on whether who invented the first telescopes. Many other different or modified and better telescopes were created after his creation -
robert hooke's discovery of cells
The cell was first discovered and named by Robert Hooke. He remarked that it looked strangely similar to small rooms which monks have lived in, and that was how the name was created. However, what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope. The cell walls observed by Hooke gave no indication of the nucleus and other organelles found in most living cells. The first man to witness a live cell under a microscope was Anton van Leeuwenhoek. -
leeuwenhoek's microscope
It was the Dutch Antony Van Leeuwenhoek who used the microscope to start making discoveries, using simple light.
He looked at lake water, blood and gums and teeth. The tradesman turned to craft his own lenses, which had up to 300X magnification, a huge jump in power from most previous devices. -
Dutch Antony Van Leeuwenhoek
He is credited with discovering bacteria, protists, nematodes, and spermatozoa. this further advanced the idea of cells because without bacteria it would be hard for scientists to make the cell theory. He examined and drew the “animalcules” now known as bacteria. Leeuwenhoek noted that the bacteria was “very prettily a-moving” in the spittle, one type going “like a pike does through the water.” -
Henri Dutrochet
Henri Dutrochet studied the cell in 1824. Also, he proposed that new cells arose from old ones. he stated that the cell was the basic unit of organisms. Dutrochet discovered that plants grow because of the reproduction of cells, and cells were mandatory to a living organism. -
Robert Brown
Robert Brown was watching the process of pollen grains fertilizing a plant, he noticed that there were ovals inside the plant cells and the pollen was moving in and out of the ovals. He realized that the ovals were of great importance to the cells and called them the nucleus of the cell. The nucleus is like the brain of the cell that contains DNA and directs everything that takes place in the cell. -
Matthias Schleiden
Schleiden discovered the cell approximately in 1838. He declared that the cell is the basic building block of all plant matter. He founded that all plants are made up of cells. Like the rest of the scientists, Schleiden did his discoveries under a microscope. Schleiden's theory proved Dutrochet's theory because he concluded that all plants have cells, which if that is the case then the cell is the basic structure of organisms. -
Theodor Schwann
In 1839, Theodor Schwann, a German biologist, reached the same conclusion as Schleiden about animal tissue being composed of cells, ending speculations that plants and animals were different in structure. he also suggested that cells would be the unit for life and preexisting cells produce new cells. He suggested most of the cell theory. -
cell theory: all living things require cells
there were many scientists seeking to understand more about what makes up plants and animals. Several scientists realized that there were cells present in both plants and animals, that’s where they concluded that all living organisms require cells to live. -
Rudolf Virchow
In 1855, the German physiologist, Rudolf Virchow was able to add a third part to the cell
theory. He stated that all cells develop only from existing cells.He looked at tissues and noticed that the same cells were on diseased tissues and healthy tissues.
