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When looking through a slide with two very small holes located
very close together (optometer aperture), in the absence of
accommodation relative to their distance, objects close
to the eye appear to be relatively well focussed except that there
appear to be two of ...
If a circular disc separated into various differently coloured sectors is rotated by a motor so fast that the eye can no longer distinguish the colours, a mixed colour is then perceived. By varying the composition and size of the sectors, it is possible to give the impression of any ...
Electronystagmography (ENG) is an electrophysiological
diagnostic procedure for measuring the movement of the eyes.
Several electrodes measure the potential differences that are
caused by the eye movements. When looking at a moving, regular,
repetitive pattern (e.g. the wagons of ...
The content of plant ash is investigated to investigate the
mineral content of plants. The characteristic lines of the elements
are determined using a small spectroscope. The cations of sodium,
potassium and calcium are detected qualitatively.
Active carbon is a good absorbent and as such is excellent when used as a filter. During water treatment, for example, active carbon filters are used to remove pesticides and detergents (soap and washing-up liquid). The cleansing of water can be demonstrated impressively by ...
Eight petri dishes are filled nearly to the brim with finely sieved, moist garden soil and 50 cress seeds are planted in each one. They are then placed inside a device which keeps each of the samples at a different temperature, whereby they are evenly distributed between cold and warm regions. ...
Heavy-metal ions may be carried into surface or ground water
from mining fields or via the waste water of galvanicor similar
production sites. They block the effect of enzymes so that the
processes in the metabolism of the organisms that are controlled by
these enzymes may be ...
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