Prokaryotes Microbes

Prokaryotes Microbes

Here we shall consider in brief prokaryotes other than eubacteria. These are chiefly archaebacteria, mollicutes, (mycoplasmas or PPLO), L-forms, mycobacteria, myxobacteria, rickettsiae and chlamydiae.

Archaebacteria
These bacteria differ from true bacteria (eubacteria) in respect of organisation and chemical composition of their cell wall and cell membrane. Their 16s rRNA molecules also differ from other bacteria and ribosomes are insensitive to chloramphenicol. They are also unique in inhabiting extreme environments.

Such physiological features coupled with morphological and structural differences make them distinct from true bacteria. They appear to be primitive bacteria and erectcd to the status of a kingdom, distantly related to other prokaryotes. They include the methanogens of anaerobic muds; the extreme red halophiles; the salt loving bacteria of saturated brine and salted fish; and the thermoacidophiles, found in hot sulphur spring or smouldering coal wastes. It is suggested that they represent a very ancient lineage whieh diverged from the eubacteria very early in evolutionary process, and have survived only in these specialised ecological niches.

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Nonfruiting Active Cellulolytic Forms Swarm Stage of Myxobacteria Encystment or Fruiting Stage of Myxobacteria Cytophagales Rickettsiae Structure of Rickettsiae List of Rickettsial Diseases Weil Felix Test Chlamydiae List of Chlamydial Diseases Comparison of Gonorrhea and Nongonococcal Urethritis (NGC)/Chlamydia Urethritis

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