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By E. J. Ferguson Wood
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Additional info for Microbiology of Oceans and Estuaries
Sample text
T. thiopartrs does not grow below pH 5, aerobic. T. denitr$cans utilizes reduction of nitrate to nitrogen as source of energy, and oxidizes sulfides anaerobically. B. Heterotrophic (7) Pseudomonadaceae. The commonest bacteria in marine environments, most strains being strongly pleomorphic in the natural environment, less so if at all in old or prolonged culture. Most of the strains found fit morphologically into Mycoplana or appear as Spirillae on primary isolation, and later become morphologically Psezldomonas.
The conclusions of these authors are very interesting: “In all this, little has been said about the separation of species, because the more experienced workers in this field have for the present ceased trying to identify them. It seems certain that most of the Psetldomonas and Achromobacter species described in the current lists of Bergey or Brisou are illusory; in this connection, one may recall the recent monograph by Rhodes in which he suggested that the species of Psetldomonas (exclusive of plant pathogens) should be reduced to three, not very readily separable.
The hydrolysis of carbohydrates is another selective property. Some strains will hydrolyse agar even if other carbon sources are supplied, others will do so actively only if no other source is present, while still others hydrolyse agar only very slowly. The majority of strains isolated from a single environment are intermediate in activity but would not be classified as Agarbacterium if grown on nutrient agar. Further, some strains lose the property of agar digestion on prolonged subculture. This, in my opinion, makes the use of such generic names erroneous and misleading and it is high time they were dropped.