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Articles by Ali Reza Khosravi
Total Records ( 3 ) for Ali Reza Khosravi
  Ali Reza Khosravi , Mahdi Mansouri , Ali Reza Bahonar and Hojjatollah Shokri
  The natural occurrence of fungal contamination was evaluated in stored maize in three different agro-ecological zones (Iran, Brazil and China). A total of 45 samples were analyzed and 685 fungal isolates were identified. The most frequent isolated fungi from maize originated from Iran, Brazil and China were Fusarium sp. (17.3, 17.9 and 37.1%), Aspergillus sp. (9.3, 17.4 and 19.7%), Penicillium sp. (5.8, 15.2 and 17.6%), Rhizopus sp. (2.4, 3.2 and 3.5%), Mucor sp. (1.1, 1.6 and 1.3%), Cladosporium sp. (1.6, 1.9 and 1.9%), Alternaria sp. (1.1, 1.6 and 1.3%), Geotrichum sp. (0, 0 and 0.3%), Acromonium sp. (0.5, 0.8 and 0%) and Absidia sp. (0, 0.8 and 0.5%), respectively. Significant difference was observed between the frequency of fungal isolates of Iranian maize and foreign products (p<0.0005). Maize mycoflora profiles showed that Fusarium verticillioides and Aspergillus flavus prevailed in 30.7 and 13.3% of the samples from China, in 12 and 5.3% of the samples from Iran and 11.7 and 11.5% of the samples from Brazil, respectively. There were significant differences in the frequency of Fusarium verticillioides in Chinese maize with other countries products (p<0.0005) and that of Aspergillus flavus in Iranian maize with other countries (p<0.002). The results emphasize that farmers and consumers should be alerted to the danger of fungal contamination in maize.
  Ali Reza Khosravi , Mohammad Dakhili and Hojjatollah Shokri
  Feed contamination to fungi can lead to nutrient losses and detrimental effects on animal health and production. The purpose of this study was to investigate the mycoflora of 32 feed samples representing 10 types of animal feed ingredients, which included corn seed, corn silage, cottonseed meal, dried bread, barely, straw, hay, bran, mixed-feed and concentrate, in Ghom province, Iran during a one-year study. The most dominant species isolated of animal feed samples belonged to the genera Aspergillus (56%), Mucor (17%), Penicillium (15%), Fusarium (6%), Cladosporium (2%) and yeast (4%). From Aspergillus genus, three species were identified and Aspergillus flavus was the most frequent (48%). The highest fungi were detected from barely (17.6%). In all samples, the toxigenic (Aspergillus, Fusarium, Penicillium) and non-toxigenic fungi were prevailed in 67% and 33%, respectively, representing significant difference between two groups (p<0.05). Regarding to presence of highly toxigenic fungi on the feeds, it should be considered to plan a program for identifying fungi in order to hygienic control of fungi on feeds into the future.
  Samaneh EIDI , Ali Reza KHOSRAVI and Shahram JAMSHIDI
  Malassezia yeasts are commensal organisms on the skin of warm-blooded vertebrates. The lipid-dependent Malassezia species have recently been cultured from veterinary specimens. The present study investigated and compared different Malassezia species in the skin and external ear canal of healthy and diseased dogs. The sampling in the study was carried out on 152 animals, comprising 90 samples from the diseased group and 62 samples from the healthy group. All of the samples were determined by cytological examination and fungal culture. The isolated yeasts were identified by their morphological features as well as their physiological characteristics. The culture results were positive in only 32.2% samples, including 75.5% samples from the diseased group, and 24.5% samples from the healthy group. A total of 75 strains from 6 Malassezia species isolated from both groups were detected with a frequency rate as follows: M. pachydermatis (56%), M. sympodialis (28%), M. furfur (8%), M. obtusa (5.4%), M. globosa (1.3%), and M. restricta (1.3%). The present work confirms both the presence of M. pachydermatis as the most prevalent species in both groups, and the presence of some lipid- dependent species of Malassezia.
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