1 / 13

MICROSCOPES

MICROSCOPES. Microscopes reveal the world of the cell : Advances in science often coincide with advances in tools and technology Use of the microscope led to development of the cell theory: - All living things are made of cells

vidor
Download Presentation

MICROSCOPES

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MICROSCOPES

  2. Microscopes reveal the world of the cell: • Advances in science often coincide with advances in tools and technology • Use of the microscope led to development of the cell theory: - All living things are made of cells - cells come from other cells by reproduction.

  3. Terms: Magnification: the increase in the apparent size of an object Resolution: a measure of the clarity of an image (The ability of an optical instrument to show two close objects as separate)

  4. Types of microscopes: • Light microscope: works by passing visible lightthrough the specimen - Glass lenses bend light to magnify the image - Light microscopes can effectively magnify images only about 1,000 times

  5. The light microscope

  6. 2. Electron microscope: uses a beam of electrons instead of light Advantage: much greater resolutionandmagnification Disadvantage: preparing the specimen kills the cells

  7. There are 2 types of electron microscopes: Transmission electron microscope:(TEM) used to study details of internal cell structure • Specimens are cut into extremely thin sections and stained with atoms of heavy metals • A beam of electrons is aimed throughthe slice

  8. Scanning electron microscope:(SEM) examines the cell surface after it has been coated with a thin layer of metal

More Related