Biology

Influence of the hydrogen ion concentration on the enzymeaction

Effect of heavy metal ions on enzymes

Thin layer chromatography of vitamins in a multivitamin pre-paration

Dependence of the soil temperature on the structure and wa-ter content of the soil

Principle

This experiment covers the separation and analysis of traces of sand, clay and humus in soil. These substances, both mineral and organic, appear in various types of soil and have a major effect on soil properties. The quantity of humus is the basis for the ...

Influence of the temperature on the reproduction rate ofgreen algae

Selected green algae are cultivated at various temperatures. Every day the number of cells per unit volume is determined with the help of a microscope and plotted against time on a graph. A comparison can then be made of the reproduction rates at various temperatures.

Humidity preferendum of soil arthropods

Principle

Heat radiated by a lamp gradually causes soil to dry out. That and the light emitted cause any creatures in a sample to burrow to the bottom where they are sieved into a funnel and collected inside a vessel. The vessel contains moist filter paper in order to capture ...

Visibility depth, suspended matter and light conditions in abody of water

Electrometric determination of dissolved oxygen in water

Courtship and copulation behaviour of Drosophila

Agonistic behaviour in male fighting fish

Shoaling behaviour in fish

Stanley-Miller-experiment

Hydrogen ion concentration of water

Water purification by filtration with active carbon

Principle

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 im ...

Air pollution through uncontrolled waste burning