![]() (A micrometer equals 1/1,000,000 of a meter. There are three basic shapes of bacteria represented in this sample taken from Danielles wormery: coccus (round or oval) bascillus (rod-shaped) and spiral (. Scanning electron micrograph of methicillin-resistant Staphylococcus aureus (MRSA) courtesy of CDCĪn average coccus is about 0.5-1.0 micrometer (µm) in diameter. Bacteria are difficult to see with a bright-field compound microscope for several reasons: They are small: In order to see their shape, it is necessary to use a magnification of about 400x to 1000x. Bacteria were Leeuwenhoek's most remarkable microscopic discovery. These span out the whole bacterium from one end to the other. He then published his observations in a series of letters to the Royal Society of London. The shape comes from proteins that form long cables within the bacterial cell. There are also three common arrangements. ![]() scanning electron micrograph of Staphylococcus aureus, a staphylococcus courtesy of Dennis Kunkel's Microscopy Bacteria were first observed by the Dutch microscopist Antonie van Leeuwenhoek in 1676, using a single-lens microscope of his own design. There are three main bacterial shapes: coccus (round), bacillus (rod), and spirillus (spiral). negative image of Staphylococcus aureus
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