Biology

Photosynthesis (bubble-counting-method)

Ionic permeability of the cell membrane

Determination of the Michaelis constant

Substrate inhibition of enzymes

Enzyme inhibition (poisoning of enzymes)

Conductivity of various water samples

We examine our drinking water

24-hour weather observation

Relative humidity

The pH value of various soils

Salinity of soils and plant substrates

Contrast medium experiment with a blood vessel model

Principle:

A liquid contrast medium is to be injected into a model of a blood vessel, which is hidden from sight and exposed to X-ray radiation, to enable the inner structure of the model to be examined on a fluorescent screen.

Tasks:

1. A 50% potassi ...

Recording of nerve and muscle potentials by mechanical sti-mulation at the rear end of an earthworm (with the Cobra3 Basic-Unit)

Principle and tasks:

To work on the following themes by measuring nerve and muscle potentials:

• The course of a biphasic action potential over time
• Estimation of the conduction velocity
• Coding of the stimulant intensity as frequency modulation< ...

Recording of nerve and muscle potentials by mechanical sti-mulation at the front end of an earthworm (with the Cobra3 Basic-Unit)

Principle and tasks:

To work on the following themes by measuring nerve and muscle potentials:

• The difference in sensitivity of the front and rear ends
• The facilitation effect
• Conduction velocity and fibre diameter
• Synaptic depressi ...

Recording of nerve potentials after the electrical stimula-tion of an anaesthetised earthworm (with the Cobra3 Basic- Unit)

Principle and tasks:

To work on the following themes by measuring nerve and muscle potentials:

• The action of an anaesthetic
• The different conduction velocities of median and lateral giant fibres
• Refractory period of the median giant fibre