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Experimentarkivet - Enkla experiment för barn och vuxna. PROFESSOR ROCK. Cell Size and Scale. Some cells are visible to the unaided eye The smallest objects that the unaided human eye can see are about 0.1 mm long. That means that under the right conditions, you might be able to see an ameoba proteus, a human egg, and a paramecium without using magnification. A magnifying glass can help you to see them more clearly, but they will still look tiny.

Smaller cells are easily visible under a light microscope. It's even possible to make out structures within the cell, such as the nucleus, mitochondria and chloroplasts. Light microscopes use a system of lenses to magnify an image. To see anything smaller than 500 nm, you will need an electron microscope. Adenine The label on the nucleotide is not quite accurate. How can an X chromosome be nearly as big as the head of the sperm cell? No, this isn't a mistake. The X chromosome is shown here in a condensed state, as it would appear in a cell that's going through mitosis.

Carbon The size of the carbon atom is based on its van der Waals radius.

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Allemansrättsskolan. No. Watch - Upptäck. BBC Two - Icons: The Greatest Person of the 20th Century - Scientists. PhET PowerPoint Add-in - Add Science & Math Simulations to Slides. PhET is a free resource that has been popular with science and math teachers for many years. PhET provides free interactive math and science simulations covering topics in physics, chemistry, biology, earth science, and mathematics. In the PhET library you'll find simulations appropriate for elementary, middle, high school, and university students.

PhET even offers a search tool that will help you find lesson ideas built upon the free simulations. 56 of the PhET simulations are available to insert into PowerPoint presentations through the use of PhET's free PowerPoint Add-in. With the Add-in installed you can browse the available simulations and insert them into your slides. The simulations work in your slide just as they do on the PhET website. Applications for Education The PhET PowerPoint Add-in could be time-saver if you are planning to use more than one simulation during a lesson. Grundskola 4-6.

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Hans Persson | Konkret och kreativ NO. Miljö. Biologi. Natur. Kemi. Teknik. Fysik. Hans Persson | Konkret och kreativ NO. Om - NO-Labbet. Smart is the New Sexy. Our story as revealed by science. - Hashem Al-Ghaili. Ett bildspel om Alfred Nobel. Photo. Fakta om naturen och rymden. Begreppsmaskin | Liber. Evas Superkoll, Säsong 1, del 6-10.