statement of problem: changes in protein levels, host calls enzymes and inflammatory mediators in gingival crevicular fluid (gcf) are considered as diagnostic indicators of periodontitis.purpose: he aim of the present study was to measure the elastase enzyme activity in gingival crevicular fluid among patients with periodontitis.material and methods: in this study, 52 periodontitis patients (ex...

in this study, a computational fluid dynamics (cfd) model was developed to evaluate ultraviolet disinfection applesauce reactor. to simulate uv reactors, three sets of equations, including hydrodynamics, radiation and species mass conservation were solved simultaneously. the realizable k-e turbulence model and the discrete ordinate method were used to find the uv radiation profile through the r...

increasing the thermal stability and resistance to bacterial attack (bioresistance) of the potato starch used in the water-based drilling fluid is the aim of this work. four types of potato starch grafted with acrylamide and a mixture of each one with acrylic acid, 2-acrylamido-2-methyl-1-propane sulfuric acid and itaconic acid were synthesized by manganese (iv)-induced redox system at the suit...

a pressurized fluid extraction (pfe) method for the extraction of pistachio oil was developed using a modified supercritical fluid extractor. the supercritical fluid extraction apparatus was modified to be able to pump liquid solvent and co2 into the extraction vessel alternatively. the experimental results showed that the extraction yield was independent of the extraction pressure. it was also...

treatment of hydrocephalus in posterior fossa tumors in children is still a matter of controversy and different centers have their own routines. in this regard, hospital records of all children with posterior fossa tumors treated in our center during the interval of 1985-1995 were reviewed. patients’ demographic and diagnostic data were analyzed and the frequencies of shunting procedures were d...

mumps infection is endemic in iran. our objective was to evaluate the presence of anti mumps antibodies ( igm & igg) in cerebrospinal fluid in mumps meningoencephalitic children. a prospective/cross-sectional study was performed in tehran, iran (2003 to 2004) and serum anti mumps antibodies (igm) were detected (quantitive; elisa) in meningoencephaltis patients. specific anti mumps antibodies (i...

objective cerebrospinal fluid (csf), its secretion, circulation and absorption have been the subject of recent researches. there is a general agreement that the main site of csf secretion is in the choroids plexus. however, the main absorption site is controversial. some believe that arachnoid granulations are the principle sites of csf absorption. in this study, different locations of csf abso...

background: receptor activator of nuclear factor kappa b ligand (rankl) is one of the key cytokines in the induction of osteoclastogenesis both in vitro and in vivo.several reports indicated the presence of srankl in gingival crevicular fluid of patients with periodontal diseases. objective: to determine the presence of rankl in peri-implant crevicular fluid samples of implants with peri-implan...