2Objectives State Objectives: 2 -Identifying components of the cell theory-Identifying cells as prokaryotic or eukaryoticOur objective:To understand and be able to use a microscope.To observe cells.
3The MicroscopeZacharias Janssen: He gets credit for the first microscope, in Middleburg, Holland, around the year 1595.Point: Since Zacharias was very young at that time, it's possible that his father Hans made the first one, but young Zach took over the production.
5The MicroscopeGalileo: In 1609, (father of modern physics and astronomy), heard of these early experiments with microscopes and worked out the principles of lenses. He made a much better instrument with a focusing device.
7The MicroscopeAnton van Leeuwenhoek: He made simple (one lens) microscopes. started as an apprentice in a dry goods store where magnifying glasses were used to count the threads in cloth. He taught himself new methods for grinding and polishing tiny lenses of great curvature which gave magnifications up to 270 diameters, the finest known at that time. These led to the building of his microscopes and the biological discoveries for which he is famous.Point: Leeuwenhoek was the first person to describe bacteria (from teeth scrapings), protozoans (from pond water), helped to prove the theory of blood circulation.
9The MicroscopeRobert Hooke: His remarkable engineering abilities enabled him to invent and improve many mechanical devices, including timepieces (for which he invented the spiral spring), the quadrant, and the Gregorian telescope.Point: In Micrographia (1665), he coined the word cell to describe the features of plant tissue (cork from the bark of an oak tree) he was able to discover under the microscope. He also improved on Leeuwenhoek light microscope.
13The MicroscopePractice Naming the Parts of the Microscope
14The MicroscopeThe perfect light microscope only allows us to see thing half the wavelength of light.We need to create an instrument to see smaller items.
15The MicroscopeElectron Microscope: Co-invented by Germans, Max Knott and Ernst Ruske in Can magnify object up to a million times.Draw backs: No living organism can survive an electron microscope. We can’t see cell movements.