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Ultrastructure of Thiothrix spp. and "Type 021N" Bacteria
T M Williams1, R F Unz, J T Doman
1Laboratory of Environmental Microbiology, Department of Civil Engineering, and Department of Molecular and Cell Biology, The Pennsylvania State University, University Park, Pennsylvania 16802.
Applied and Environmental Microbiology
|July 1, 1987
Summary
Ultrastructural analysis reveals distinct features in Thiothrix spp. and type 021N filamentous sulfur bacteria, including differences in fimbriae, sheaths, and cell wall complexity. These findings enhance our understanding of microbial morphology and taxonomy.
Area of Science:
- Microbiology
- Cell Biology
- Bacteriology
Background:
- Filamentous sulfur bacteria, including Thiothrix spp. and type 021N, play significant roles in sulfur cycling.
- Understanding their ultrastructural characteristics is crucial for taxonomic classification and ecological function.
Purpose of the Study:
- To investigate and compare the ultrastructural features of Thiothrix spp. and type 021N filamentous sulfur bacteria.
- To elucidate the cellular organization and identify key morphological differences between these bacterial groups.
Main Methods:
- Transmission electron microscopy (TEM) was employed for ultrastructural examination.
- Negative staining with uranyl acetate and thin sectioning with ruthenium red staining were utilized.
Main Results:
- Tufts of fimbriae were observed at the ends of gonidia in both Thiothrix and type 021N.
- A sheath enveloped Thiothrix trichomes but was absent in type 021N; type 021N exhibited a more complex outer cell wall.
- Sulfur inclusions were membrane-bound and located within cytoplasmic membrane invaginations.
Conclusions:
- Distinct ultrastructural differences exist between Thiothrix spp. and type 021N, particularly regarding sheath presence and cell wall structure.
- These morphological variations contribute to the taxonomic differentiation of these filamentous sulfur bacteria.
- The study provides detailed insights into the cellular architecture and organization of these important microbial groups.