Microscopes Development of the microscope n n n

Microscopes

Development of the microscope n n n Anton van Leeuwenhoek Father of Microbiology Made his own lenses (some as powerful as the microscopes we use in class)

Microscopes Type of microscope Focuses what Through /Surface Magnifies up to Live organisms?

Compound light microscope n n n Focuses light Uses combination of lenses Shines light through objects Magnifies up to 1000 times (ours are 400 x) Can view live organisms www. science. smith. edu/. . . /Labmanual/01 CELLS. htm

http: //www. bioweb. uncc. edu/1110 Lab/notes 1/labpics/Elodea%20 Leaf 40 c. jpg

Dissecting microscope n n n Focuses light See surface of objects Magnifies up to 40 times Can view live organisms Uses combination of lenses wappingersschools. org/. . . /visualvocab/page 4. html

http: //www. keweenawalgae. mtu. edu/ALGAL_IMAGES/charophyceans/Chara_d 2_LApond 2 e_3. 15 x. jpg

Electron microscope Two types: Transmission electron microscope (TEM) n Scanning electron microscope (SEM) n

Transmission electron microscope n n Focuses electrons Sees through objects Magnifies up to 100, 000 times Can view only dead or inanimate objects www. phy. cuhk. edu. hk/. . . /CM 120. html

Transmission electron microscope Mammalian mitochondrion biology. unm. edu/. . . /Summaries/Cell. html

Scanning electron microscope n n Uses electrons View surface of objects Magnifies up to 10, 000 times Views only dead or inanimate objects http: //gsc. nrcan. gc. ca/ebeam/sem_e. php

Scanning electron microscope Bee eye www. rdg. ac. uk/cfam/facilities/sem. htm

Viruses budding from a cell Transmission electron microscope Scanning electron miscroscope www. aecom. yu. edu/aif/gallery/sem. htm

Ion microscope n n Uses positively charged ions surface Magnifies up to at least 1, 000 times Cannot view live organisms

tungsten atoms through ion microscop e http: //www. aip. org/mgr/png/images/wolkow. jpg

Question # 11 & 12