ABSTRACT
Six different varieties of date-palm viz. Sukhari, Saggae, Rotana, Kholasi, Rashoodia and Nabtat Ali, were screened for seed-borne fungi. Eleven species belonging to nine different genera of fungi were isolated. The genera isolated were Alternaria, Eurotium, and Fusarium (two species), Aspergillus, Drechslera, Penicillium, Rhizopus, and Curvularia (one species each). This is the first record of seed-borne fungi from Phoenix dactyliera L. in Saudi Arabia.
ABSTRACT
Fungi inhabiting household environments in the West, East and Central localities of Riyadh city were screened. The screened area included bedrooms, drawing rooms, living rooms, kitchens and bathrooms. The common genera of fungi isolated were Alternaria, Aspergillus, Cercospora, Chaetomium, Cladosporium, Curvularia, Drechslera, Embellisia, Fusarium, Mucor, Penicillium, Rhizopus, Scytalidium, Trichoderma, Torula and Ulocladium. Two uncommon genera Nodulosporium and Oidiodendron for Saudi Arabian mycoflora were also isolated. In all the localities, the highest number of fungal colonies per plate or per gram were found in the living rooms, followed by bedrooms. The number of colonies per plate or per gram was in general higher in densely populated than in less populated areas.
Subject(s)
Environmental Microbiology , Fungi/isolation & purification , Housing , Allergens/isolation & purification , Dust , Fungi/immunology , Humans , Saudi ArabiaABSTRACT
Some surface mycoflora, which might spoil truffles, were investigated on four different truffles, Tirmania nivea (Desf. ex Fr.) Trapp., T. pinoyi (Maire) Malençon, Terfezia boudieri Chatin, and T. claveryi Chatin. Twenty-three species of fungi were isolated of which Aspergillus and Mucor constituted the predominant genera. Bacteria were also found on all truffles both from the outer coat and the inner parts. Bacillus species and E. coli were isolated most frequently from the truffles tested.
ABSTRACT
Analysis of fatty acids using GLC revealed the presence of ten saturated, four unsaturated fatty acids, and an unidentified compound in different quantities in the truffles, Tirmania nivea , T. pinoyi , and Terfezia boudieri . These findings are discussed in relation to the occurrence of fatty acids in other fungi.
ABSTRACT
A comparative study of the lipids, proteins, amino acids and of the ultrastructure of lipid bodies of Penicillium chrysogenum (mesophilic), Talaromyces leycettanus (thermotolerant) and T. thermophilus (thermophilic) was done. The highest lipid content was found in T. thermophilus and highest protein content in P. chrysogenum whilst a total of 17 amino acids were found in P. chrysogenum and T. thermophilus and only sixteen were detected in T. leycettanus. Ultrastructural features of lipid bodies are reported and compared.
Subject(s)
Ascomycota/metabolism , Penicillium chrysogenum/metabolism , Penicillium/metabolism , Amino Acids/analysis , Ascomycota/ultrastructure , Bacterial Proteins/analysis , Lipids/analysis , Microscopy, Electron , Penicillium chrysogenum/ultrastructure , Species SpecificityABSTRACT
Natural gum Arabic ( Acacia senegal L.) showed appreciable growth of microorganisms in different growth media. Fungi isolated were three species of Aspergillus , Alternaria sp., Curvularia sp., and Helminthosporium sp., and dominant bacteria isolated were four species of Bacillus , Serratia marcescens and Micrococcus varians . No algal growth was observed. Gamma irradiation with 60Co (53 Kr/h) eradicated all fungi isolated except Alternaria sp. which required 13.25 Krad irradiation and Alternaria was sp. completely eradicated with 39.75 Krad irradiation. Bacterial growth was reduced dramatically with 13.25 Krad and with 39.75 Krads of irradiation, and was completely stopped with 106 Krads. Hydrolyzed carbohydrates showed very little change, quantitatively, in both natural and irradiated gum, and paper chromatographic separation showed the presence of glucuronic acid, galactose, rhamnose and arabinose. The unirradiated gum did not show any ESR signal. The irradiated samples gave resonance lines that increased in intensity as the irradiation dose was increased. The g-value of the resonance lines was calculated as 1.004±0.001. Use of gamma irradiation as a means of irradiating microorganisms without severe damage to the carbohydrate composition, but with minor changes in the ESR spectrum of gum is discussed.
