กล้องจุลทรรศน์ Levenhuk 7S NG Microscope 71917
Levenhuk 7S NG Monocular Microscope is an advanced microscope for beginner explorers of the micro world. It will be a wonderful assistant in studies and will help in performing a lot of scientific experiments. It is easy to operate – even a little kid can work with it on his/her own. That is partially due to the safe design of the microscope: Levenhuk 7S NG body is made of shockproof metal; illumination does not require AC supply.
The magnification range of the microscope is from 40x to 800x. It is sufficient for carrying out school biological experiments, exploring the life of one-cell organisms, and studying the small structures of the prepared microscope slides. The revolving nosepiece accommodates three objective lenses; the eyepieces of different magnification can be placed into the eyepiece tube. You can adjust sharpness with the fine and coarse focusing knobs. The mechanical scale allows for precise placement of the microscope slides directly under the objective lens.
For illumination, the microscope uses an Abbe condenser, an iris diaphragm, light filters and a mirror placed under the stage.
The kit includes:
User Manual: User manual: Levenhuk 5S/7S NG Microscopes (pdf)
Looking for something to start your observations with?
Paramecium caudatum is perhaps one of the first protozoans that a young naturalist would explore. These organisms live in fresh standing water. They can also be found in an aquarium, especially if it hasn’t been cleaned for a long time. My ciliate-shoes were taken from the aquarium. Of course, there are only a few ciliate-shoes in aquarium water – the possibility of finding one of them in your microscope’s eyepiece is extremely low. Therefore, we need to increase their concentration. To do so, take a jar (about 17 fluid ounces or 0.5 liters), fill it with aquarium water, put a small spoiled onion and banana peel inside. Put the jar in a warm dark place for 5 to 7 days (don’t close it with a lid).
Paramecium caudatum. Animation. Magnification: 64x.
The average size of Paramecium caudatum is 0.02 inches (0.5 mm). For locomotion Paramecium caudatum uses its cilia (about 15 thousand cilia cover its little body!). Moreover, it has two nuclei (a large macronucleus is responsible for nutrition, respiration, metabolism, etc.; and a small micronucleus – for reproduction). Paramecium caudatum feeds on bacteria or algae. The food is caught by an oral groove covered in cilia and then goes to the cell mouth. It is then digested in the digestive vacuole (gullet). Undigested leftovers are ‘thrown out in the open’ through an anal pore (cytoproct). To remove all excess water, our heroine has two contractile vacuoles. They work like pumps on a boat, pumping excess water out of its body. Paramecium caudatum maintains its slipper-like shape thanks to a special membrane (pellicle).
Study this image to learn all parts of Paramecium.
Some things you can see under a microscope:
You can find a review on this microscope here.
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