Alireza Ghassempour

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A simple and effective speciation and preconcentration method based on hollow fiber liquid phase microextraction (HF-LPME) was developed for simultaneous separation of trace inorganic tellurium and selenium in environmental samples prior to electrothermal atomic absorption spectroscopy (ETAAS) determination. The method involves the selective extraction of(More)
Trichlorfon is an organophosphorus insecticide, which is extensively being used for protection of fruit crops. Trichlorfon is a thermal labile compound, which cannot be easily determined by gas chromatography (GC) and has no suitable group for sensitive detection by high performance liquid chromatography (HPLC). In this study, a 31P nuclear magnetic(More)
In this study, a total of 25 endophytic fungi were successfully isolated from the inner bark of Taxus baccata grown in Iran by the aseptic technique. Genomic DNA was extracted from isolated endophytic fungi and subjected to polymerase chain reaction (PCR) analysis for the presence of the Taxus taxadiene synthase (ts) gene, which encodes the enzyme(More)
The biodegradability of a polycyclic aromatic hydrocarbons (PAHs) mixture consisted of fluorene (Fl), phenanthrene (Phe) and pyrene (Pyr) by a bacterial consortium enriched from mangrove sediments under sediment-free and sediment slurry conditions was investigated. The enriched consortium made up of three bacterial strains, namely Rhodococcus sp.,(More)
Antibacterial activity of silver nanoparticles (AgNPs) was investigated using Staphylococcus aureus PTCC1431 as a model of Gram-positive bacteria. The mechanism of antibacterial activity of AgNPs was then studied by analyzing the growth, morphology, and molecular variations in the cell wall. Experimental data showed that AgNPs at a concentration of 4 μg/ml(More)
Diazinon is an organophosphorus insecticide (OPP) that is used as a pesticide for Chilo suppressalis (WLK) (Lep., Pyralidae) in rice fields. The extraction of diazinon from soil and the stems of rice plants has been carried out by microwave-assisted extraction (MAE) and the results compared with ultrasonic extraction (USE). The best parameters for MAE are(More)
The venom proteomes of Toxicocalamus longissimus and Hydrophis cyanocinctus, a fossorial and a marine species, respectively, of the Hydrophiinae genus of Elapidae, were investigated by Edman degradation of RP-HPLC isolated proteins, and de novo MS/MS sequencing of in-gel derived tryptic peptide ions. The toxin arsenal of T. longissimus is made up of 1-2(More)
For successful conservation and breeding of a medicinal species, it is important to evaluate its genetic diversity as well as its content of phytochemical compounds. The aim of the present study was to investigate the genetic variation of Iranian natural populations of W. somnifera and W. coagulans, using the RAPD (random amplified polymorphic DNA) markers,(More)
Cyclotides are an interesting family of circular plant peptides. Their unique three-dimensional structure, comprising a head-to-tail circular backbone chain and three disulfide bonds, confers them stability against thermal, chemical, and enzymatic degradation. Their unique stability under extreme conditions creates an idea about the possibility of using(More)
Cyclotides are a very abundant class of plant peptides that display significant sequence variability around a conserved cystine-knot motif and a head-to-tail cyclized backbone conferring them with remarkable stability. Their intrinsic bioactivities combined with tools of peptide engineering make cyclotides an interesting template for the design of novel(More)