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Database Central
Wastewater Organisms Database
Thiothrix I and II
Purpose of Web Page
The purpose of this web page is to present the physical characteristics of a filamentous bacteria that is present in wastewater. Thiothrix species consist of two types of Thiothrix and they are Thiothrix I and Thiothrix II. Thiothrix filaments are straight or slightly curved with Thiothrix I having an overall length of 100-500 µm and individual cells having a rectangular shape (1.4-2.5 x 3-5 µm). Thiothrix II has total length varying form 50-200 µm and its cells are rectangular (0.8-1.4 x 1-2 µm). Both types of Thiothrix are found stretching from the floc surface, there is a noticeable septa between cells. Both species are Gram negative and Neisser negative with cells that on occasions have sulphur granules. There are additional structures on Thiothrix trichomes and they include apical gonidia as well as rosettes and a sheath is present, incidental attached growth may be observed. A holdfast may add to the characteristic of radiating out from a common center, the "starburst effect".
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This photograph of Thiothrix I. Notice the rectangular shaped cells. Thiothrix I is one of the largest filamentous bacteria seen in wastewater in addition to 021N and Fungi. This photo was taken at a magnification of 1000x.. |
This is a photomicrograph of Thiothrix I. Again, notice the rectangular shaped cells. There is no attached growth. |
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This is Thiothrix II. Notice how the trichomes seem to radiate out from a common center. This is characteristic of Thiothrix. This photo was taken at a magnification of 400x. |
The "starburst effect" characteristic of Thiothrix II. More than one trichome can be seen radiating out from a common center. Notice incidental attached growth. This photo was taken at a magnification of 1000x. |
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Date Page Last Revised: 19 January 2000
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