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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 ...
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 ...
This experiment allows a vivid demonstration of short-sightedness and long-sightedness compared to the normal vision of the human eye and of how such defects can be corrected.
Los métodos de producción biotecnológicos desempeñan un papel
económico muy significativo en las industrias farmacéutica, química
El biorreactor de burbujas aquí mostrado representa una alternativa
sencilla y ...
The stem of plants must accomplish various functions. It
supports the leaves, the lateral branches, and the blossoms. The
mechanical supportive tissue (collenchyma) is responsible for the
necessary stability and elasticity. Did you ever come to think
about how a 20m-tall tree is ...
There is a genus of very small crustaceans living in salt lakes.
These animals feed on other microscopic organisms such as algae and
bacteria. The brine shrimps lay eggs from which larvae develop.
These grow up to juvenile crustaceans within a few weeks. When salt
lakes dry up ...
This experiment shows how much the quality of drinking water of
various locations in the same region can vary. The comparison of
tap water with bottled mineral water and distilled water leads to
The altitude profile of a hiking trail or route to school can be
measured during a school trip or as an exercise for the students.
The altitude profile can also be used to demonstrate that the
atmospheric pressure decreases when the altitude increases. As a
result, the experiment ...
The compact Cobra4 "Weather" multisensor can be employed as a
simple means to setup a weather station, which can then be used to
explain the relationship between the air pressure, humidity,
temperature, and the light intensity. The measurement combination
of a Cobra4 Mobile-Link ...
The drawing of maps is one of the favourite tasks of the
students during geography lessons and of a high didactic value. The
altitude measuring function of the Cobra4 Sensor-Unit "Weather" is
a user-friendly tool which provides altitude values so that contour
lines can be added ...
Why are there only a few different kinds of plants in a
deciduous forest? Except for having trees that are all
approximately of the same height, hardly any other plants grow in a
deciduous forest, except for young plants of the same type of
trees. This experiment shows how the ...
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