Thames & Kosmos Kids First: Biology Lab (V 2.0) handleiding
Handleiding
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24
On a “carpet safari”
in your house dust
You will need
– Slide
– Cover slip
– Pipette
– Tweezers
– Water
– Sheet of white letter-size paper
– Sample from the vacuum cleaner
– Desk lamp
– Kitchen sieve
Here’s how
1. Place a dust sample in a fine-meshed kitchen
sieve and shake the sieve gently over the sheet
of paper. Little dust particles and a few mites
will fall onto the sheet when you do that.
2. House mites don’t like air that is too warm or
dry. As soon as you warm the sheet with the
desk lamp, they will escape from the dust and
gather themselves into little groups.
3. Use the tweezers to transfer the escapees to a
drop of water on the slide, and then cover them
with a cover slip and study them under the
microscope.
EXPERIMENT
9
I
Whether you look in the carpet, on upholstered
chairs or sofas, or in the bed, you will find them
everywhere that dust accumulates — tiny
creatures known as dust mites. They are
essentially harmless little animals that feed
primarily on flakes of dead skin. They really
only become a problem for those of us who
suffer from dust mite allergies. If you are
allergic, dust mite excrement can trigger a
sneezing attack or even breathing problems.
K
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House dust mite
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Kids First: Biology Lab (V 2.0) |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 24679 MB |
