Mehdi Razzaghi-Abyaneh

[ 1 ] - Expression of aflR, veA and laeA as regulators of aflatoxins and cyclopiazonic acid biosynthesis pathway in Aspergillus flavus

In this study, the production of aflatoxin B1 (AFB1) and cyclopiazonic acid (CPA) was investigated in toxigenic and non-toxigenic Aspergillus flavus with respect to expression of aflR, veA and laeA genes that are involved to toxins production. A. flavus strains were cultured in YES broth at 28 °C for 4 days and the presence of (AFB1) and (CPA) was confirmed and measured by TLC and HPLC. The exp...

[ 2 ] - Biogenic Approach using Sheep Milk for the Synthesis of Platinum Nanoparticles: The Role of Milk Protein in Platinum Reduction and Stabilization

Bio-directed synthesis of nanoparticles is an interesting field of rapid advancement for biologists,chemists and materials scientists, especially in light of efforts to find out green methods of inorganicmaterial synthesis. In the present study, green synthesis of platinum nanoparticles (PtNPs) using sheepmilk is reported for the first time. By adjusti...

[ 3 ] - Scanning Electron Microscopy (SEM) analysis and biological control of Ixodes ricinus using entomopathogenic fungi

In the present study, pathogenicity of four native strains of Entomopathogenic fungus; Metarhizium anisopliae, was studied against adult stage of Ixodes ricinus. For this purpose a total number of 180 adult ticks were examined in triplicate. Thirty ticks for each strain and negative and positive controls were immersed in 2.4×107 fungal conidia/ml in vitro. Samples were incubated in separate Pet...

[ 4 ] - Mycobiota and aflatoxin B1 contamination of rainbow trout (Oncorhinchus mykiss) feed with emphasis to Aspergillus section Flavi

In the present study, mycobiota and natural occurrence of aflatoxin B1 (AFB1) in pellet feed and feed ingredients used in a feed manufacturing plant for rainbow trout nutrition was investigated. The samples were cultured on the standard isolation media for 2 weeks at 28 ºC. Identification of fungal isolates was implemented based on the macro- and microscopic morphological criteria. AFB1 was d...

[ 5 ] - ارزیابی حضور و تنوع ژن Alt a 1 در آلترناریاهای جداسازی شده از هوای تهران

زمینه و اهداف: در تحقیق حاضر، الگوی پراکندگی و فیلوژنی گونه های آلترناریای جدا شده از هوای تهران بر اساس حضور و تنوع ژن Alt a1 مورد بررسی قرار گرفت. مواد و روش کار: تعداد 48 جدایه آلترناریا متعلق به گونه های آلترناریا الترناتا (33/4%)، آلترناریا سولانی (23%)، آلترناریا تنئوایسیما (23%)، آلترناریا پوری (16/6%) و آلترناریا براسیکولا (4%) جداسازی شده از نمونه های هوای شهر تهران در پلیت های سابورو...

[ 6 ] - Comparative Study of the Major Iranian Cereal Cultivars and some Selected Spices in relation to Support Aspergillus parasiticus Growth and Aflatoxin Production

Background: Aflatoxins are toxic fungal metabolites enable to contaminate a wide range of natural substrates. This contamination can be host-specific for different plant species. In this study, the ability of a toxigenic Aspergillus parasiticus to produce various aflatoxins on major Iranian cereals was evaluated with special focus on plant susceptibility to toxin production at cultivar level. M...

[ 7 ] - Mycobiota and aflatoxin B1 contamination of rainbow trout (Oncorhinchus mykiss) feed with emphasis to Aspergillus section Flavi

In the present study, mycobiota and natural occurrence of aflatoxin B1 (AFB1) in pellet feed and feed ingredients used in a feed manufacturing plant for rainbow trout nutrition was investigated. The samples were cultured on the standard isolation media for 2 weeks at 28 ºC. Identification of fungal isolates was implemented based on the macro- and microscopic morphological criteria. AFB1 was d...

[ 8 ] - Aflatoxins and aflatoxigenic fungi in Iran: A systematic review of the past, present, and future

Aflatoxins are highly toxic compounds that are produced as secondary metabolites by some Aspergillus and Emericella species. Despite huge progress on aflatoxin research during the past 50 years, we have witnessed many cases of food contamination with aflatoxins all over the world. Aflatoxins have mutagenic and carcinogenic effects and they are capable of inducing hepatocellular carcinoma in hum...

[ 9 ] - تاثیر پارامتر زمان بر رشد قارچ آسپرژیلوس پارازیتیکوس و تولید آفلاتوکسین توسط آن در مجاورت گیاه چریش

مقدمه: آفلاتوکسین ‌ ها متابولیت ‌ های ثانویه سمی قارچی هستند که توسط سویه ‌ های مولد سم برخی از گونه ‌ های قارچ آسپرژیلوس بر روی مواد غذایی انسان و دام تولید می ‌ شوند. بدلیل خواص جهش ‌ زایی و سرطان ‌ زایی، این سموم از جمله عوامل مخاطره ‌ آمیز بهداشت عمومی در انسان و دام محسوب می ‌ گردند. مقابله با تولید آفلاتوکسین توسط قارچ ‌ های مولد و یا حذف آنها از مواد غذایی، توجه محققین زیادی را طی سال ‌ ...