Abstract
The mycelial wall of Conidiobolus obscurus is essentially composed of β(1 → 3)-glucan (soluble in cold NaOH) associated with small amounts of protein and chitin. It is also characterized by the absence of galactose, uronic acids, and chitosan. The wall of the azygospore is different from that of the mycelium and is almost exclusively composed of a chitin–protein complex associated with a very small amount of hexoses. The mycelial wall is easily fractionated by cold or hot NaOH and hot acetic acid, whereas the spore wall is very resistant to both acid and alkali treatments. The composition of the various fractions is outlined. Chitin is present as short microfibrils while protein occurs in an amorphous form; β(1 → 3)-glucans are present in both amorphous and fibrillar forms. An architectural scheme of the mycelial and spore walls is proposed.
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