 Human eye: >0,1mm (=100µm)  Microscope:>0,4µm  Electron microscope: >2 nm (=0,002µm)

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Presentation transcript:

 Human eye: >0,1mm (=100µm)  Microscope:>0,4µm  Electron microscope: >2 nm (=0,002µm)

Do you know the function of any of these structures? Task : Fill in the blanks with the correct words.

rts.pdf

 Steps to follow before starting to actually examining something under the microscope:

 1. For each pair, get a microscope to share.  2. Use both hands as demonstrated to you.  3. Remove the dust cover and store away properly.  4. Make sure the objective lens is on the smallest magnification.  5. Plug your microscope in and switch it on.  Set your specimen slide and get a clear picture with the smallest magnification.

TASKS:  Take a hair from your head.  Prepare a wet mount and a dry mount.  Can you guess what a wet mount is? What is the proper procedure to prepare a wet mount?  Have a look at the hair and its root.  Describe the surface of a hair.  Compare the wet mount and the dry mount.  Tidy up and make sure objective lens is on lowest magnification before you return it to the cupboard.

Preparing a wet mount slide cover slip

 Draw with a PENCIL! (One you can erase!)  Include clear, proper labels! ◦ Date, your name ◦ Name of the observed object ◦ Magnification, e.g. 10x10  Use at least half an A4 sheet for the drawing  It´s not about artistic drawing! Draw what you see!

Recap : Main parts of a microscope Proper handling of a microscope Wet mount and dry mount

 Know the most important parts of a microscope?  Know how to use a microscope properly?  Make a drawing from an observed object?  Prepare a wet mount

 Material:  How to do it:

 Draw at least 2 different species you can find!

 Banana and onion cells

 Take a look at your own oral mucosa cells.  Draw them.  Compare them with the onion cells you have seen! Can you find a difference?