Introduction: Tympanoplasty is the standard and well established procedure for closure of tympanic membrane perforations .This paper compares the results of tympanoplasty in terms of hearing improvement and graft incorporation in patients with chronic perforation of the tympanic membrane between two groups with and without active drainage at the time of surgery.  Materials and Methods: Sixty re...

the aim of the current study is to investigate hearing function in patients with allergic rhinitis. fifty-eight patients with positive skin prick test (group 1) (116 ears) and    31 subjects with negative skin prick test (62 ears) as group 2 were included. pure tone audiometry at 250,500, 1000, 2000, 4000 and 8000 hz and immittance measures, including tympanometry and acoustic reflex tests, wer...

background: it is estimated that about 370 million people are chronic carriers of hbv worldwide. apparently 3% of iranian populations are chronic carriers of this virus. we aimed to evaluate the viral dna in biological fluids of chronic hepatitis patients compared to a control group. methods: the current case-control study was designed to evaluate the viral dna in biological fluids of 70 chroni...

objectives: hearing impairment in children is considered as an important public health problem. auditory function in these children is poor and depends on their hearing aids efficacy and also their ears’ status. hearing aids are very expensive and ear disease deteriorates its performance. therefore detecting the ear disease and offering proper treatment is necessary. the aim of this study is to...

Intersection homology is obtained from ordinary homology by imposing conditions on how the embedded simplices meet the strata of a space X . In this way, for the middle perversity, properties such as strong Lefschetz are preserved. This paper defines local-global intersection homology groups, that record global information about the singularities of X . They differ from intersection homology in...

introduction: chronic otitis media (com), a persistent and durable inflammation and infection of the middle ear, is a common disorder. alterations in the contralateral ear in sufferers have been observed in recent years. because only a few studies have been reported in this area, we performed this study in order to assess alterations in the contralateral ear of patients with com.   materials an...

in order to study the effect of sowing date and plant density on ear of sweet corn an experiment was conducted in gorgan reaserch station since june 2001 during 3 years. in this experiment five sowing date (24th june, 9th july, 24th july, 18th agust and 23th agust) and four plant density (45000, 55000, 65000 and 75000 plant per hectar) were evaluated in form of factorial experiment (5×4) within...