Abstract

Summary Conventional and unconventional microbial morphotypes were observed in geothermal springs when in situ electron microscopy methods were used. The conventional morphologies observed were rod, coccal and spiral shaped cells. In certain cases, phage and flagellated cells were also observed. The unconventional morphotypes consisted of cells with “flap” like structures or filamentous cells which possessed swollen sac-like structures. Based on the typical cell wall architecture some of the microorganisms could tentatively be assigned to archaebacterial species or Thermus species. The methods described in the paper have aided in the identification and thereby the isolation of some of the unique morphotypes whereas some other types still elude isolation.

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