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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 galvanic or similar production sites. They block the effect of enzymes so that the processes in the metabolism of the organisms that are controlled by these ...
Kit completo para estudio de defectos de la visión humana con modelo experimental
Este kit con modelo experimental permite los siguientes beneficios:
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 fruits and blossoms of many plants possess intensively
bright colors. The colorful fruit attracts animals, are devoured by
them and the seeds are excreted at other places. This is how the
plant is dispersed. Colorful blossoms attract insects that harvest
nectar from the ...
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 surprising results.
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 is ...
The compact Cobra4 "Weather" multisensor can be employed as a simple means to set up a weather station, which can then be used to explain the relationship between air pressure, humidity, temperature, and light intensity. The measurement combination of a Cobra4 Mobile-Link and a ...
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 ...
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 ...
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