الفهرس 
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Abstract
The cellulolytic thermophilic fungal species;Chaetomium thermophile, Sporotrichum roseolurn and Hurnicola grisea var. thermoidae were compared to the thermotolerant ones ; Q. olivaceum, Aspergillus fumigatus, Paecilom,’{ces variotii and the mesophilic species; G. globosumj lie grisea, Trichothecium roseum and Sclerotium cepivorum from the following points of
A.Production and acti vi ty of the extracellular celluolyli tic and amylolytic enzYmes at different temperatures.
B.Lipid composition and production at various temperatures.
C.Effect of temperature on leakage of electrolytes and sugars from mycelial cells.
D.Effect of some supplementary nutrient factors on tempera ture tolerance.
A- Results of testing the cellulolytic and amylolytic capa bilities of the selected fungal species revealed the following :
1.All the fungal species tested were able to degrade filter papers and utilize soluble carboxymethylcellulose
amylase enzymes when gro\~ at )0 C than at 45 c.
motolerant species exhibited optimal activity at 40 C
with slight decrease over a temperature range up to
60 C whereas, the enzymes produced by mesophiles showed
optimum activity at 30 C with slight decrease in act i-
vity as the temperature is increased up to 50. C.
1.On dry weight basis, mycelia of therrnophiles contain more lipids than either the mesopbiles or the thermo-
produce more lipids at 40 C than at lower or higher
lipids and sterol content. whereas, lipids of mesophi les contain high proportions of triglycerides.
grown at 45 C than at 30 C.
when grown at 45 C which decreased in its relative
o concentration when the fungus was grown at 30 C.
7.G.L.C. analysis indicated that the major fatty acids in the total lipids of the fungi examined were, myri-
stic, palmitic, palmitoleic, stearic, oleic and linoleic acid with quantitative diffrences among the