Biologie

Mélange de couleurs subjectif avec disque de Newton

Principle

Si un disque circulaire divisé en différents secteurs de couleur différente mis en rotation par un moteur suffisemment vite que l'œil ne peut plus distinguer les couleurs, une couleur mélangée est alors perçu. En variant ...

Water quality - contamination avec heavy métals

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 ...

Mécanisme de la respiration diaphragmatique

• poumon
• Respiration
• diaphragme
• les muscles du diaphragme
• Panier poitrine

Blood pressure measurement

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

Défauts de vision (maquette de la fonction oculaire)

Principe

Dans la myopie, le globe oculaire est trop long, mesuré du milieu du cristallin à l'arrière de l'œil. Les rayons lumineux qui pénètrent dans la lentille ne s'unissent pas sur la rétine après réfraction, mais ...

Teneur en protéines des aliments - réaction du biuret

Learn to recognize possible tests for protein and examine various foods for protein.

Lc 4.6

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 ...

Fermentation alcoolique de mélasse avec de la levure

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 ...

Nous étudions notre rythme cardiaque - électrocardiographie



Principle

The heart is a hollow, muscular organ that comprises several secondary muscles. These secondary muscles contract and relax successively, thus pumping the blood through the heart. These muscle activities can be measured electrically as a whole at the surface of the skin ...

Nous étudions notre rythme cardiaque - électrocardiographie

Electromyographie (EMG)sur le bras supérieur

Principle

With the exception of the heart muscle, the contractions of striated muscles can be controlled at will. This characteristic enables the observation of the activities of individual muscle groups. An electromyogram (EMG) can be used to measure (record) the electrical activity (i.e. ...

Electrooculographie humaine (EOG) avec Cobra4

Principle

With this experiment, you can find evidence of the electrical activity that is generated during the movement of your eyes. Several electrodes attached to the skin of the face measure all the changes of the electrical voltage that are caused by the movement of the eyes. This ...

The components of the microscope

Principle

 While small items and living beings can be magnified by up to 15 times with a magnifying glass, it is necessary to use a light microscope to magnify by 40x to 400x, with particularly powerful microscopes even 1000x.

Benefits

• Experiment is part of a complete solution set ...

Working avec the microscope mi 1.2

Principle

You should observe some basic rules of microscopy so you can make interesting observations as soon as possible.

Benefits

• Experiment is part of a complete solution set with a total of 50 experiments for all microscopy applications
• With student worksheet, appropriate for all ...

Microscopic magnification mi 1.3

How small or big are the objects you see under the microscope? The following exercises shall help to illustrate the magnification of the microscope.