Labeling the parts of the microscope activity:http://www.biology.ualberta.ca/facilities/multimedia/uploads/intro-biology/microscope.html

Image from wikimedia commons: http://commons.wikimedia.org/wiki/File:Microscope-blank.svg

MagnificationThe image we see through the light microscope has been magnified.

Objective lensx eyepiece lens

Modern Microscopy

Image: d2540-6 by USDA on Flickr (CC): http://flic.kr/p/dPqvvY

Modern Microscopy

Image: d2540-6 by USDA on Flickr (CC): http://flic.kr/p/dPqvvY

As we develop more and more sophisticated and precise imaging tools, we can see more detail of the cells and molecules that make us.

Scanning electron microscopes deliver high-resolution, 3D surface images of structures, whereas transmission electron microscopes give us a view inside cells and organelles.

Emiliana huxleyi

Image from: http://earthguide.ucsd.edu/earthguide/imagelibrary/emilianiahuxleyi.html

Transmission electron micrograph of HIV particles.

HIV-1. Transmission electron micrograph, via wikimedia commons: http://commons.wikimedia.org/wiki/File%3AHIV-1_Transmission_electron_micrograph_AIDS02bbb_lores.jpg

120nm

False-coloured scanning electron micrograph of HIV (green) budding on a lymphicoyte (blue) http://en.wikipedia.org/wiki/File:HIV-budding-Color.jpg OR http://phil.cdc.gov/phil/details.asp?pid=10000

1μm

Scanning electron micrograph of HIV particles budding on a human lymphocyte.

Unicellular Organismscarry out all the functions of life

M ovementR espirationS ensitivity

G rowthR eproductionE xcretionN utrition

Paramecium bursariaby Proyecto Agua on Flickr (CC) http://flic.kr/p/7WXdFz

Given the right conditions, cells can survive outside their normal habitat.

Art from Petri dishes_1 by Image in Science and Art on Flickr (CC) http://flic.kr/p/838xjC

VIRUSESAre they living or non-living?

Hmm…..

Image: Swine Flu H1N1 virus influenza 9.0 by hitthatswitch on Flickr (CC) http://flic.kr/p/74e4SP

Some units that I use & know

Unit abbr. Metric equivalent

kilometer km 1,000m 1 x 103m

meter m 1m 1m

centimeter cm 0.01m 1 x 10-2m

millimeter mm 0.001m 1 x 10-3m

micrometer μm 0.000 001m 1 x 10-6m

nanometer nm 0.000 000 001m 1 x 10-9m

÷1,000

÷1,000

÷1,000

X 1,000

μm = micrometersWe usually use this in discussion of cells.

There are 1,000μm in one mm.

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