PPT-VIRTUAL ELECTRON MICROSCOPE

VIRTUAL ELECTRON MICROSCOPE Click Here to Begin to Use the Electron Microscope If you are viewing this message you must switch to SLIDE SHOW mode or use the F5 key to switch to slide show mode. Jim Atherton. Development of Light Microscope. 1590 Hans Zacharias Janssen. 1660 Robert Hook. Onserved. . cells (cork). 1. Klein, Aaron E. The Electron Microscope: A Tool of Discovery. New . Y. ork,McGRaw. Different types of microscopes. Objectives. Learners should . be able to:. explain how an electron microscope is different to a light microscope. define the terms magnification and resolution. convert units of measurement used in microscopy. Depth of . f. ield: small. Magnification. Uses lenses arranged in series, made of optical material that bends light. All magnification takes place via lenses. Uses . diascopic. illumination (that is, light is transmitted through the specimen). Magnification up to about 1000x.. Microscopy is the technical field using microscopes to view samples and objects that can not be seen without unaided eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of microscopy: optical, electron and scanning probe microscopy.. Microscope Review The diagram represents a cell in the field of view of a compound light microscope. In which direction should the slide be moved on the microscope stage to center the cell in the field of view 1590. –first compound microscope. History of the Microscope. 1655 – . Robert Hooke. used a compound microscope to observe pores in . cork.. He called them . “cells”. History of the Microscope. Electron . Microscopic techniques . (EM). 2020-2021. Electron microscopy (EM) is an electron beam which is focused into a small probe across the surface of . a specimen. . The. . first. . electromagnetic lens was developed in 1926 by Hans Busch. Electron microscope follows the same principle of compound microscope, but uses electrons beam as an illumination source instead of light. . What Is Microscope?. It is an instrument which deals with too small organisms that they cannot be seen distinctly with the naked eye. Microscopes provide the observer with enhanced . resolution. (ability to observe two nearby objects as distinct objects), . Introduction to the Microscope.  . What Is Microscope?.  . It is an instrument which deals with too small organisms that they cannot be seen distinctly with the naked eye.. Microscope Types. 1. Compound . . Electron microscopy (EM) . is an electron beam which is focused into a small probe across the surface of a specimen . . The first electromagnetic lens was developed in 1926 by . Hans Busch. .. . By the end of this topic, you will be able to:. Name the parts of the microscope and their functions.. Use the microscope to observe biological specimens. Know the difference between the light microscope and the electron microscope. Theoretically a microscope is an array of two lenses Need of M icroscopy Living organisms, cells and their organelles which are too small to be seen with the human eye, can only be seen with the aid To explain the advantages of using an Electron Microscope . To be able to carry out Simple Magnification Calculations. . are boundaries that have . two dimensions,. and they normally separate regions of the materials that have . two different crystal structures. . . Example. : Grain Boundaries. . Grain Boundary.