bio lab 6
Microscopy and the Electron Microscope Humans have been magnifying objects for centuries by using lens. Using lens to magnify objects has helped mankind know more about the cell theory and ways of life. Zacharias constructed the first compound microscope. Robert Hooke used the microscope to examine slices of cork. He noticed many "little boxes" and called them cells. Cells are the building blocks of life. We would not know as much about cells as we do with out microscopes. It is important to know about the different types of microscopes and how they function. CD player, Individualized Biology lab book, pen, and your brain. Objectives: (See page 2 of Individualized Biology Unit 9 Script.) Anton van Leeuwenhoek is considered to be the father of bacteriology. He used a simple microscope consisting of one lens to observe bacteria and other unicellular microorganisms. He grinded the lens he used, so that the lens had great curvature. He reached magnifications of 270 diameters. This was the most reached from his time. Magnification increases the visibility of what ever detail the objective lens can reveal. There is a s
The bright field light source is used in the compound microscopes in lab. The transmission electron microscope only takes sections of the given specimen. The preparation for the light microscope is much easier to do compare to the electron microscopes. In the lab it was easier to see the parenchyma of the potato after adding the iodine. The light microscope however, does not give a 3D image like the transmission electron microscope and the scanning electron microscope. It is about 100 times more than the light microscope. ignificant relationship between wave length and resolving power. The Scanning electron microscope scans the entire surface. All you have to do is prepare the specimen on to a slide. The preparation of the specimens for the electron microscopes is much more work, as described in the results section. In the lab I was able to look at red blood cells. This allows me to see things that I can not with just my eyes. The transmission electron microscope takes cross-sections of a specimen.
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