The biology of Polyangium cellulosum var. fulvum (Imsenecki and Solntzeva) Mishustin
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"Initial interest for this study of Polyangium cellulosum var. fulvum (Imsenecki and Solntzeva) Mishustin was developed during talks with Dr. John E. Peterson, Department of Botany, University of Missouri. Dr. Peterson had found P. cellulosum var. fulvum and three other varieties of P. cellulosum in considerable profusion in Missouri soils. Previous to this, this organism had never been found in North American soils; it had been reported only in Russian soils. The genus Polyangium Link, which contains thirteen species, is one of the five genera comprising the family Polyangiaceae. The family Polyangiaceae is one of five families of the Myxobacterales, an order of the Schizomycetes. Members of the genus Polyangium may best be described as producing fruiting structures which consist of rounded cysts surrounded by a well developed membrane. The cysts may be either free or embedded in a second slime layer. The vegetative cells of species of Polyangium are elongated rods which shorten and thicken during the fruiting stage. A review of the literature concerning cellulose-decomposing myxobacteria indicates that the major proportion of the studies have been accomplished on the Cytophaga group. Our present knowledge of P. cellulosum var. fulvum is extremely limited, and is based on only two different studies. Much information concerning these organisms is lacking. Nothing is known of the developmental morphology, or of the germination of fruiting bodies nothing is known of dye reactions, or movement of the vegetative cells. There is no information on such basic physiological characteristics as nutrition, optimum pH, optimum temperature, or resistance to adverse environment. The specific goal of the study reported in this thesis was to contribute to the knowledge of the morphology and physiology of Polyangjum cellulosum var. fulvum (Imsenecki and Solntzeva) Mishustin."--Introduction.
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