BIOL 2051 Chapter : Chapter 2 Outline Spring 12
Document Summary
In library on first floor at reserve desk: Microbiology: an evolving science- call number is rx52. Size of prokaryotes: prokaryotes are generally smaller (0. 4 10 m, small size allows a simpler structure, prokaryotic cells can be as small as 0. 2 m. Typically have diameter of 2 m: some microbiologists have proposed that bacteria smaller than 0. 2 m exist in nature, cells referred to as nanobacteria. Microscopy: simple microscopes, one lens, magnify 50 300x, compound microscopes, multiple lenses, much higher magnification (1000x, ones in 2051 lab magnify 1000x. Lens system of compound microscopes: condenser lens located between light source and specimen, focuses light up through specimen, objective lens system, closest to specimen, typical scope has 10, 40, & 100x objective lenses. In each objective are multiple lenses: ocular lens system, closest to the eye, typically magnify 10x, each ocular has multiple lenses. Resolution: ability to distinguish between 2 separate objects that are close together --- causes an appearance of convergence.
