Биология

 
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Water quality - contamination with heavy metals

Principle

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 enzymes may ...

 
Детали

Продукт No: P0990162

Mechanism of diaphragmatic respiration

Benefits
  • Graphic demonstration experiment
  • Easy to demonstrate
  • Easy to understand
 
Детали

Продукт No: P1049300

Blood pressure measurement

Tasks
  1. Determination of the systolic and diastolic blood pressure
  2. Determination of the blood pressure under physical stress
 
Детали

Продукт No: P1051100

Vision defects (model experiment)

Function and Applications

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.

 
Детали

Продукт No: P1054300

Detection of quinine in tonic water

Principle

Chinine is the main alkaloid of the bark of the Chinabaum. It has a typical, bitter taste and is hardly soluble in water, but soluble in alcohol, ether and chloroform

In this experiment, chinine is extracted from tonic water with an organic solvent and detected by its fluorescence ...

 
Детали

Продукт No: P1259800

Fermentation of molasse to ethanol with yeast

Principle

As a result of the need to save energy and the increased consciousness of environmental problems, biotechnological production methods are on the advance. Fermenters are used for the biotechnological production of enzymes and other products using bacteria, yeast and cell cultures. For ...

 
Детали

Продукт No: P1313600

Chromoplasts

Principle
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 ...

 
Детали

Продукт No: P1441301

The stem of a monocotyledonous plant

Principle

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 ...

 
Детали

Продукт No: P1442301

Brine shrimp (Artemia salina)

Principle

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 ...

 
Детали

Продукт No: P1443901

We examine our drinking water

Principle

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.

Benefits

  • Experiment is part of an experiment set with ...
 
Детали

Продукт No: P1520062

Altitude measurement on a trail

Principle

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 ...

 
Детали

Продукт No: P1520262

Weather observation with the Cobra4 Mobile-Link

Principle

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 ...

...

 
Детали

Продукт No: P1520462

Terrain mapping

Principle

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 ...

 
Детали

Продукт No: P1520662

Changes of the light conditions in a deciduous forest

Principle

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 ...

 
Детали

Продукт No: P1520762

Acidity changes of a watercourse

Principle

The pH value (a measure of the concentration of hydrogen ions) in running waters depends on the geological conditions, the pollution load that is caused by agricultural production, and on plant activities. This experiment shows how the pH value of a stream changes even at a short ...

 
Детали

Продукт No: P1520862

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