objective: microsporidia are ubiquitous opportunistic pathogens infecting all animal phyla. the purpose of this study was to characterization human-associated microsporidia in pigeons of tehran by staining and molecular methods. materials and methods: in the year 2010 a total of 147 pigeon’s fecal samples were randomly collected from bird stores and public parks of tehran and screened for the ...

this study utilized molecular methods to identify 22 isolates from traditional dairy products of azerbaijan. pcr was carried out using the universal primers of 16s rdna and a fragment of ~1500bp was amplified. amplified ribosomal dna restriction analysis was performed using bsuri, mspi, hindiii, taqi and bsp143i. ardra results were compared to the restriction profile in enzymatic restriction an...

background: clarithromycin resistance in helicbacter pylori has been found to be associated with point mutations in 23s rrna gene leads to reduced affinity of the antibiotic to its ribosomal target or changing the site of methylation. the aim of this study was to determine the most important point mutations in 23s rrna gene in h. pylori that are closely related to clarith-romycin resistance amo...

conclusions: this study detected multiple drug resistance in pseudomonas aeruginosa including resistance to β-lactams, aminoglycosides, and fluoroquinolones. therefore, identification of drug resistance patterns in p. aeruginosa and detection of pan-resistant producing isolates are of great importance in prevention and control of infections in burn center ward. background: serious infections by...

This is an update for the 5S rRNA sequences of the BERLIN RNA DATABANK last published in 1990 (1). The new entry consists of 25 eubacterial and 2 eukaryotic 5S rRNA sequences and 10 plant 5S rRNA pseudogenes (Table 1). Thus the BERLIN RNA DATABANK contains as of February 1, 1991 the 5S rRNA sequences of 44 archaebacteria, 292 eubacteria, 20 plastids, 6 mitochondria, 321 eukaryotes and 21 eukary...

Nucleolus is the major structural domain of the cell nucleus, which in addition to proteins contains ribosomal RNA (rRNA) at different stages of maturation (or pre-rRNA). In mammals, the onset of mitosis is accompanied by the inhibition of rRNA synthesis, nucleolus disassembly, and the migration of pre-rRNA to the cytoplasm. However, the precise role of cytoplasmic pre-rRNA in mitosis remains u...

5S rRNA is an integral component of the large ribosomal subunit in virtually all living organisms. Polyamine binding to 5S rRNA was investigated by cross-linking of N1-azidobenzamidino (ABA)-spermine to naked 5S rRNA or 50S ribosomal subunits and whole ribosomes from Escherichia coli cells. ABA-spermine cross-linking sites were kinetically measured and their positions in 5S rRNA were localized ...