1. 1. Microscopes UNIT THREE, LESSON 3.1 BY MARGIELENE D. JUDAN
2. 2. LESSON OUTLINE History of Microscope Timeline Common Types of Microscopes
3. 3. HISTORY TIMELINE o1st century CE oLate 13th century o1595 o1609 o1665 o1674 o18th century1830 o19th century to present
4. 4. 1st century CE (0 99 CE) oThe Romans invented glasses, studied and tested them. oThey were able to reshape the glasses in such a way that one side is thick and one side is thin. oThe glasses were placed above an object, and it became bigger. oThats the birth of lenses. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
5. 5. Late 13th century oLenses were used as spectacles for people with blurred vision. oThese lenses are the first microscope (with 6 to 10x magnifying power). 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
6. 6. 1595 oZacharias Jansen, with the help of his brother, Hans, came up with the discovery of the first compound microscope. oIt has two or more lenses. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
7. 7. 1609 oGalileo Galilei heard Janssens remarkable creation. He created an almost similar model to see faraway objects. oHe created the telescope, which was originally named as spyglass. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
8. 8. 1665 oAnton van Leeuwenhoek created a high magnifying power lens, thus regarding him as the Father of Microscopy. oHe is first one to observe bacteria and protozoan which he called animalcules. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
9. 9. 1674 oRobert Hooke, the Father of Cytology, made his compounds microscope and observed little boxes from the thin slice of cork which he called cells. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
10. 10. 1830 oJoseph Jackson Lister improved the ability of compound microscopes. oHe discovered that using weak lenses together at various distances provided clear magnification. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
11. 11. 19th century to present (1800s present) oDevelopment of microscopes continue. Today, we have now different types of microscopes aside from lenses and compound microscopes. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
12. 12. 19th century to present (1800s present) oIn 2013, the University of Victoria launched the most powerful microscope. oEngr. Prof. Rodney Herring shows the electron microscope he designed, and which in March created the highest resolution image yet, on the order of the fraction of the width of an atom. oThe microscope is 4.5 m tall. 0 AD 1200 1300 15951609 1674 1665 18301700 201519001400 1500
13. 13. There are two types of microscopes: simple and compound. oSimple microscopes have one lens and have a weaker magnifying power (5x) (ex. magnifying glass) oCompound microscopes have two or more lenses with powerful magnification. The types of microscopes on the next slide are all compound microscopes.
14. 14. COMMON TYPES OF COMPOUND MICROSCOPES oCompound Light Microscope (CLM) oElectron Microscope 1. Transmission Electron Microscope (TEM) 2. Scanning Electron Microscope (SEM)
15. 15. Electron Microscopes oSo complex they can magnify up to 100,000 x oUses beam of electrons and electromagnets (not light) to focus objects oHave two types (next slide)
16. 16. Transmission Electron MS (TEM) oMagnification: 10,000-100,000 x oCommonly used to view layers and details of the specimen oViews 2D images only
17. 17. Scanning Electron MS (SEM) oMagnification: 1,000- 10,000 x oCommonly used to study the surface of a specimen and particularly for cellular and viral studies oViews 3D images
18. 18. Assignment (by group): Bring the following tomorrow 1. Cartolina (any color) 2. Colored pens 3. Color 4. Other art materials You will draw and label the parts of the microscope. The picture in your book (p. 91) will serve as a guide but if you like a larger and more detailed picture, you can print another one.
19. 19. Sources: Science Links 7