PPT-Microscopes One of most important tools of Biology = Microscope

Two main types of microscopes for biology 1 Compound light microscope 2 Electron microscope Images from httpwwwmicroscopemicroscopeorgbasicmicroscopetypeshtm httpwwwjeolcomDefaultaspxTabId124 . Microscopes are delicate and expensive instruments they should be handled with utmost care Before you use the microscope your instructor will explain its proper use Following are rule s that will protect the microscope and insure that you can make m From its humble beginnings the microscope has undergone numerous revisions since Leeuwenhoek’s day. But its usefulness has certainly not diminished. Numerous types of Microscopes are currently being used. Visit the following for a more detailed description of them. . Compound Light Microscope. Electron Microscopes. (TEM and SEM). Overview of Microscopes. Magnification. – increase of an object. ’. s apparent size. Total . magnification:. . mag. . of eyepiece x mag. of objective lens. History of the Microscope. Hans and Zacharias Janssen- (1595) Eyeglass crafters- Magnify object 3-10x . Robert Hooke- (1655) Observed pores on corks and called them "cells". History of the Microscope. Introduction to cells. Cells form the parts of an organism and carry out all of its functions.. Cells are the basic units of structure and function in living things.. What are cells?. The structure of a living thing is determined by the amazing variety of ways its cells are put together.. Optical Microscope. [photograph]. . Retrieved from https://. commons.wikimedia.org. /wiki/File:Optical_microscope_nikon_alphaphot_+.jpg. Microscopes:. Microscopes are some of the most commonly used pieces of lab equipment. Always carry your scope with 2 hands (One around the handle/Arm; One supporting the base). The Handle/Arm and oculars should be facing you when using the microscope.. Only use lens paper to clean the objectives. (provided in each Student Drawer) . 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.. How does science progress?. A clue . …. T. hink about these words by Newton:. “. If I have seen further, it is because I have stood on the shoulders of giants. .”. What is Newton really saying?. 1. When moving your microscope, always carry it with both hands. Grasp the arm with one hand and place the other hand under the base for support.. How To Use a Microscope. 2. Turn the revolving nosepiece so that the lowest power objective lens is clicked into position (This is the shortest objective lens).. . 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. Introduction The applications of microscopy in the forensic sciences are almost limitless. This is due in large measure to the ability of microscopes to detect, resolve and image the smallest items o video (link on the website). http://www.youtube.com/watch?v=X-. w98KA8UqU. Warm up . Why would we want to use a microscope to see things? When would it be better to use a telescope or binoculars?. Week 12, Day One.