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Description: English: Amoebas from C.G. Ehrenberg's Die Infusionthierchen, 1830. Date: 6 November 2011. Source: Die Infusionthierchen, 1830. Author: C.G. Ehrenberg.
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Description: English: The first record and illustration of an amoeba (possibly Chaos carolinense), from Roesel von Rosenhof's Insecten-Belustigung. Date: 1755. Source: Historiae Polyporum from Insecten-Belustigung, 1746-1761. Author: Augustus Iohannes Roesel von Rosenhof.
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Darg ground illuminated image of an unconstrained cell. Its length is a little over half a millimeter. The cell is popypodial in that many broad rounded pseudopodia form at the same time. The cell is moving to the right. The posterior end of the cell has a rumpled appearance and is the uroid.
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A smal collection of cells that are unconstrained and showing the different shapes that the amoebae may take. Stressed cells round up (upper right) and then begin to extend pseudopodia. Active cells are extended often producing many pseudopodia, and with the cells often becoming branched.
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Bright field image of a moving amoeba. The cell is polypodial and has a number of rounded pseudopodia extending in the direction of movement (upwards in this image). The posterior end is rumpled and referred to as the uroid.
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The posterior end of a moving cell has a rumpled appearance. this is the uroid. It forms as a result of the interactions between motility proteins such as actin and myosin. Phase contrast micrograph.
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As many amoebae move, the front margin of the advancing psudopodia is filled with a transparent fluid. The cytoplasm and its contents are bound together in a more gelatinous cytoplasm. The transparent region is called the hyaline cap. Phase contrast micrograph.
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The cytoplasm of this amoebae contains numerous inclusions, such as crystals. Most crystals are believed to be by products of metabolism which are not exported out of the cell but simply deposited within the cell in an inert form. Differential interference contrast optics.
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The genus Chaos is one of a small group of large (over half a millimetre) free-living amoebae, and is distinguished largely because it has numerous nuclei. The nuclei are about 20 microbs in diamter and have granular deposits of heterochromatin around the inner margins of the nucleus. These nuclei were images in a dying cell. Phase contrast micrograph.
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The posterior part of a actively moving naked amoebae usually adopts a distinctive appearance. The cytoplasm is often more rigid in this area, and the surface of the cell is thrown into folds or is the source of numerous filaments. In this amoeba, the uroid has a rumpled appearance as a result of folds forming in the cell surface. Phase contrast micrograph.
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There are only a few genera of free-living amoebae that have lobose pseudopodia and which measure over half a millimetre. The genus Chaos is distinguished in part because the cytoplasm contains many nuclei. This cell is lysing, and the nuclei are spilling out of it. Many more remains inside the cell. Phase contrast micrograph.
