File:Dd-life-cycleH.jpg
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[edit]DescriptionDd-life-cycleH.jpg |
English: The life cycles of Dictyostelium discoideum -
Most of its life, this haploid social amoeba undergoes the vegetative cycle, preying upon bacteria in the soil, and periodically dividing mitotically. When food is scarce, either the sexual cycle or the social cycle begins. Under the social cycle, amoebae aggregate to cAMP by the thousands, and form a motile slug, which moves towards light. Ultimately the slug forms a fruiting body in which about 20% of the cells die to lift the remaining cells up to a better place for sporulation and dispersal. Under the sexual cycle, amoebae aggregate to cAMP and sex pheromones, and two cells of opposite mating types fuse, and then begin consuming the other attracted cells. Before they are consumed, some of the prey cells form a cellulose wall around the entire group. When cannibalism is complete, the giant diploid cell is a hardy macrocyst which eventually undergoes recombination and meiosis, and hatches hundreds of recombinants. Not drawn to scale. |
Date | |
Source | http://www.dictybase.org/Multimedia/DdLifeCycles/index.html, http://www.dictybase.org/Multimedia/DdLifeCycles/Dd-life-cycleH.jpg |
Author | David Brown & Joan E. Strassmann |
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current | 01:48, 29 February 2012 | 2,999 × 2,249 (422 KB) | Denis Barthel (talk | contribs) |
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Orientation | Normal |
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Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS4 Macintosh |
File change date and time | 14:27, 5 October 2009 |
Color space | Uncalibrated |
Image width | 2,999 px |
Image height | 2,249 px |
Date and time of digitizing | 15:42, 1 October 2009 |
Date metadata was last modified | 09:27, 5 October 2009 |
Unique ID of original document | xmp.did:F77F117407206811B699F64559D9C419 |
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1 October 2009
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2,999 pixel
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