a novel acrylic acid-functionalized fe3o4 magnetic nanoparticle with a core-shell structure was developed for utilization as a heterogeneous organosuperacid in chemical transformations. the structural, surface, and magnetic characteristics of the nanosized catalyst were investigated by various techniques such as transmission electron microscopy (tem), thermogravimetric analysis (tga), and ft-ir...

Background and Aim: The variety of sweets along with significant difference level of hygiene in the production, supplies and high potential contamination of sweets ingredients with Escherichia coli, led to investigate the frequency of broad-spectrum beta lactamase strains of E. coli in sweets and determine the presence of SHV, TEM and CTX-M genes. Material and methods: In this descriptive cros...

this thesis basically deals with the well-known notion of the bear-invariant of groups, which is the generalization of the schur multiplier of groups. in chapter two, section 2.1, we present an explicit formula for the bear-invariant of a direct product of cyclic groups with respect to nc, c>1. also in section 2.2, we caculate the baer-invatiant of a nilpotent product of cyclic groups wuth resp...

     کلی باسیلوز یک بیماری شایع در واحدهای پرورش مرغ های گوشتی بوده که بواسطه مقاومت باکتریائی و استفاده بی‌رویه از داروها طی سالیان متمادی تلفات و خسارات زیادی را به بار آورده است. هدف از مطالعه حاضر، بررسی وجود ژن‌های bla TEM,   bla CTX-M و bla SHV در نمونه‌های اشریشیا کلی جدا شده از طیور به روش Multiplex-PCR و تعیین الگوی حساسیت آنتی بیوتیکی این سویه‌ها می‌باشد. در مجموع تعداد 60 جدایه اشریش...

Abstract Introduction and objective: Urinary tract infections (UTIs) is one of common infections in children which rapidly acquiring more resistance to antimicrobial drugs in the worldwide.  The aim of this study was to evaluate the frequency of SHV, TEM and CTX-M genes in Escherichia Coli and Klebsiella Pneumoniae strains isolated from UTI in children in 17 Shahrivar hospital from Rasht city....

some new water-soluble schiff base complexes of na2[m(5-so3-1,2-salophen)].nh2o; (5-so3-1,2-salophen = n,n’-bis(5-sulphosalicyliden)-1,2-phenylendiamine); na2[m(5-so3-2,3-salpyr)(h2o)n].2h2o; (5-so3-2,3-salpyr = n,n’-bis(5-sulphosalicyliden)-2,3-diaminopyridine); and na2[m(5-so3-3,4-salbenz)(h2o)n].nh2o; (5-so3-3,4-salbenz = n,n’-bis(5-sulphosalicyliden)-3,4-diaminobenzophenon); where m = cu, n...