Bresser BIOLUX NV Instrucciones De Uso página 21

Set a cover glass (available in most well
stocked hobby shops) perpendicularly at the
edge of the water drop, so that the water runs
along the cover glass edge (Fig. 8). Now
lower the cover glass slowly over the water
drop.
Tip:
i
The gum medium supplied
(Fig 2, 25b) is used to make
permanent slide cultures.
Add it instead of distilled
water. The gum medium har-
dens so that the specimen
is permanently affixed to its
slide.
9. Experiments
If you have made yourself familiar with the
microscope already, you can accomplish the
following experiments and observe the results
under your microscope.
9.1. Newspaper print
Objects:
1. A small piece of paper from a newspaper
with parts of a picture and some letters
2. A similar piece of paper from an illustrated
magazine
Use your microscope at
magnification and use the preparation of the
daily paper. The letters seen are broken up,
because the newspaper is printed on raw,
inferior paper.
appear smoother and more complete. The
picture of the daily paper consists of many
small points, which appear somewhat dirty.
The pixels (raster points) of the magazine
appear sharply.
9.2. Textile fibres
Objects and accessories:
1. Threads of different textiles: Cotton, line,
wool, silk, Celanese, nylon etc..
2. Two needles
Each thread is put on a glass slide and
frayed with the help of the two needles. The
threads are dampened and covered with
a cover glass. The microscope is adjusted
to a low magnification. Cotton staples are
of vegetable origin and look under the
microscope like a flat, turned volume. The
fibres are thicker and rounder at the edges
than in the centre. Cotton staples consist
primary of long, collapsed tubes. Linen fibres
are also vegetable origin; they are round and
run in straight lines direction. The fibres shine
like silk and exhibit countless swellings at the
fibre pipe. Silk is animal origin and consists
of solid fibres of smaller diameter contrary
to the hollow vegetable fibres. Each fibre
is smooth and even moderate and has the
the lowest
appearance of a small glass rod. Wool fibres
are also animal origin; the surface consists of
Letters of the magazines
overlapping cases, which appear broken and
wavy. If it is possible, compare wool fibres of
different weaving mills. Consider thereby the
different appearance of the fibres. Experts
can determine from it the country of origin
of wool. Celanese is like the name says,
artificially manufactured by a long chemical
process. All fibres show hard, dark lines on
the smooth, shining surface. The fibres ripple
themselves/crinkle after drying in the same
condition. Observe the thing in common and
differences.
9.3. Salt water prawns
Accessories:
1. Prawn eggs (Fig 2, 25d)
2. Sea salt (Fig 2, 25c)
3. Prawn breeding plant (Fig 2, 23)
4. Yeast (Fig 2, 25a)
CAREFUL!
Eggs and prawns are not fit
for human consumption.
9.3.1 The lifecycle of the saltwater prawn
The saltwater prawn or artimia salina to
scientists has an unusual and interesting
lifecycle. The female's eggs are hatched
without any male shrimp having to fertilise
them. The resultant baby prawns are all
female. Under unusual circumstances such
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