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Search Results: 1 - 10 of 572 matches for " Farzad Izadi "
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PolyvinylaminecoatedFe3O4@SiO2magneticmicrospheresforKnoevenagelcondensation
Farzad Zamani,Elham Izadi
催化学报 , 2014, DOI: 10.1016/S1872-2067(12)60685-8
Abstract: ?PolyvinylaminecoatedFe3O4@SiO2compositemicrosphereswithacore-shellstructurewerepreparedandemployedasamagneticcatalystforKnoevenagelcondensationundermildconditions.Thecatalystcanbereadilyrecoveredusingamagnetandreusedseveraltimeswithoutlossinactivityorselectivity.TheperformanceofthemagneticbasecatalystwascomparedwiththatofpolyvinylaminefunctionalizedmesoporousSBA-15,whichshowedthatthemagneticnanoparticlesgaveimprovedreactionrateandyield.
Schwannoma of the Brachial Plexus Presented as a Neck Mass: A Case Report and Review of the Literature  [PDF]
Aslan Ahmadi, Hengameh Hirbod, Mostafa Cheraghipoor, Farzad Izadi
International Journal of Otolaryngology and Head & Neck Surgery (IJOHNS) , 2015, DOI: 10.4236/ijohns.2015.42019
Abstract: Schwannomas of the head and neck as well as brachial plexus primary tumors are both uncommon entities, and combination of these conditions is quite rare. Schwannomas of the brachial plexus are usually asymptomatic and they present as slowly enlarging masses in the supra- or infraclavicular regions. Although imaging plays a routine role in the detection of these neoplasms, identification of the nerve origin is not often feasible until the time of surgery. Definitive diagnosis is based on histopathological features with presence of spindle-shaped Schwann cells. We report a case of a middle aged woman with left lateral mid-neck mass, which based on the clinical findings, was provisionally diagnosed as a painless lymphadenopathy. Ensuing excisional biopsy revealed the brachial plexus as the origin of a tumor, which subsequently was confirmed to be a schwannoma with microscopic evaluation. The course of disease was complicated with upper brachial plexus injury which was recovered by sural nerve graft.
Porous high-density polyethylene in facial reconstruction and revision rhinoplasty: a prospective cohort study
Shabahang Mohammadi, Shadi Ghourchian, Farzad Izadi, Ahmad Daneshi, Aslan Ahmadi
Head & Face Medicine , 2012, DOI: 10.1186/1746-160x-8-17
Abstract: This study was a prospective cohort study. Surgical techniques included using Medpor? in reconstruction of lamina papiracea (LP) (15 patients), frontal bone (15 patients), orbital rim (18 patients) and open rhinoplasty (8 patients). All interventions on LP were performed by endoscopic procedures. All frontal operations were carried out by bicoronal incision. In orbital defects, we used subciliary incision.From all 56 patients, 1 case had primitive neuroectodermal tumor (PNET) of maxillary sinus. In that case, reconstruction of inferior orbital rim was not successful and extrusion was occurred after radiotherapy. In rhinoplasty and other experiences no extrusion or infection were detected within the next 1 to 3?years of follow up. There were not any palpable and visible irregularities under the skin in our experiences.In this study the patients did not experience any complications during the follow up periods and the satisfaction was remarkable. Gathering these data gives rise to future review studies which can provide more organized evidences for replacing classic reconstructive methods by the presented material.Loss of tissue caused by trauma, cancer or surgery usually needs some materials for reconstruction. Initial methods which used human tissues as reconstructive materials caused different problems including disable to shape the graft, limitation of accessibility and donor site morbidity [1-3].In 1828, using artificial materials was established by using gold in nose reconstruction [1,4].Using silicon rubber, polyamide and Gore-Tex has been improved since 1950, but each of them was accompanied by different reactions such as extrusion, infection and not well-shaped slippery reconstruction [4-9].In 1970s porous high-density polyethylene (PHDPE, Medpor?) was introduced by its exclusive advantageous including no donor site morbidity, easily shaped and the minimal foreign body reaction [10-13]. Furthermore the likelihood of infection was reduced by significant vascul
The effect of speech therapy on laryngeal stroboscopic features of patients with vocal cord nodules
Mehri Safari,Younes Amirshuki,Ali Ghorbani,Farzad Izadi
Iranian Journal of Otorhinolaryngology , 2009,
Abstract: Introduction: Vocal cord nodule is one of the most prevalent disorders of laryngeal mucosa which is commonly caused by the overuse of laryngeal vocal function. The aim of this study was to investigate the effect of speech therapy on laryngeal stroboscopic features of patients with vocal cord nodules. Materials and Methods: In this clinical trial, five women with vocal cord nodules aged between 14 and 45 years participated in a speech therapy program. Their laryngeal stroboscopic features were assessed in the first and ninth sessions of therapy. Results: After speech therapy, glottal closure in 3 subjects reached to complete closure or near to it. Symmetry of phases in 3 cases reached to symmetrical condition and periodicity of phases in 1 patient reached to periodical state. After speech therapy, right mucosal wave in 4 subjects reached to normal condition. The left mucosal wave in 1 subject reached to normal and in 1 patient approached to normal form. Conclusion: The results of this study revealed that speech therapy has a gradual influence on treatment of vocal cord nodule which can be evaluated by subjective methods such as therapist's assessment of patient's voice or objective methods such as stroboscopy.
Comparison of Medical and Voice Therapy for reflux Laryngitis Based on Acoustic and Laryngeal Characteristics
Abbas Dehestani Ardakani,Farhad Torabinezhad,Zahra Agharasouli,Farzad Izadi
Audiology , 2011,
Abstract: Background and Aim: Reflux laryngitis is extremely common among patients with voice disorder. Medical therapy approaches are not efficient enough. The main goal of this study is to assess the acoustic and laryngeal characteristics of patients with dysphonia before and after medical or voice therapy, and to evaluate the effectiveness of each.Methods: In this retrospective study, 16 reflux laryngitis patients were assessed. Five received complete voice therapy, tow ceased voice therapy and nine received medication. Perceptual voice evaluation was performed by a speech-language pathologist, the severity of voice problem was calculated, based on the affected acoustic and laryngeal characteristics pre- and post-treatment.Results: Post-treatment evaluation in patients who received complete voice therapy indicates 80 percent improvement in the severity of disorder and 100 percent improvement in the perceptual voice evaluation. After medical therapy, we observed that voice disorder and perceptual voice evaluation are improved 44 and 66 percent respectively. The improvement was statistically significant in both treatment approaches: complete voice therapy (P=0.039) and medical therapy (p=0.017).Conclusion: In patients with reflux laryngitis, most acoustic and laryngeal characteristics were normal and satisfying after the treatment. It can be concluded that the proficiency of voice therapy in improving the acoustic and laryngeal characteristics is comparable to medical therapy
Effects of Voice Therapy on Vocal Acoustic Characteristics in Patients With Vocal Cord Nodules
Mehri safari,Ali Ghorbani,Yunos Amiri Shavaki,Farzad Izadi
Audiology , 2011,
Abstract: Background and Aim: Vocal cord nodule is one of the voice disorders causes hoarseness and breathy voice. Voice therapy is one of the treatment approaches. We aimed to find out the effects of voice therapy on vocal acoustic characteristics in these patients.Methods: In this case series, five women with vocal nodule (14 to 45-year-old) participated in a 9-week voice therapy program developed by Boone. Vocal hygiene and voice practices were measured every day using a questionnaire. Moreover, structure and movements of vocal folds were examined using videolaryngostroboscope by a laryngologist before and after voice therapy to evaluate the effectiveness of program. For collecting voice samples we used sustained / / in comfortable loudness for all patients and data were analyzed using Speech Studio.Results: After voice therapy, fundamental frequency in four of five subjects were decreased but it was not significant (p=0.225). However, jitter in all of five subjects was significantly decreased (p=0.043). After voice therapy, shimmer in three of five subjects were decreased that was not significant (p=0.345).Conclusion: Voice therapy can be used for the remedy of acoustic vocal characteristics and elimination or contraction of vocal cord nodule.
Detection of helicobacter pylori in benign laryngeal lesions by polymerase chain reaction: a cross sectional study
Farzad Izadi, Aslan Ahmadi, Shadi Ghourchian, Ahmad Daneshi, Faramarz Memari, Ehsan Khadivi, Shabahang Mohammadi
Infectious Agents and Cancer , 2012, DOI: 10.1186/1750-9378-7-10
Abstract: The samples were taken from 55 patients with benign laryngeal lesions and frozen in ?20°C. One milliliter (ml) of lysis buffer was added to 100 mg (mg) of each sample and the tube was placed in 56°C overnight. Then DNA extraction was carried out.To find HP DNA, in-house PCR was performed that revealed 5 positive results among 55 patients with benign laryngeal lesions. Of them, 3 were polyp, 1 was nodule and 1 was papilloma.Although the number of positive results was not a lot in this study, it was in contrast with previous studies which could not find any HP tracks in benign laryngeal lesions by other methods. More studies about the prevalence of HP in benign laryngeal lesions improve judging about the effect of this infection on benign laryngeal lesions.
Evaluation of Propagation of Chinese Hibiscus (Hibiscus rosa-sinensis) through Stenting Method in Response to Different IBA Concentrations and Rootstocks  [PDF]
Zeinab Izadi, Hossein Zarei
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513197
Abstract:

Stenting is a vegetative propagation method, based on cutting and grafting in one action. The question addressed in this study is whether indole-3-butyric acid (IBA) concentration is able to impress success of Chinese hibiscus propagation when grafted onto two kinds of rootstocks. The used IBA concentrations include: 0, 1000, 3000 and 5000 ppm and two cultivars of Hibiscus syriacus (“Blue Stain” and “Jeanne d’Arc”), which have been used as rootstock. Results indicated that, all the cultivars were superior for most of the measured parameters when IBA treatments were used compared to control plants except for average of the longest root size. The highest healing percentage resulted in stentlings (plant which has been propagated by stenting method) with 5000 ppm of IBA treatment. All IBA treatments significantly increased rooting percentage compared with the control plants. Stentlings that were treated with 3000 and 5000 ppm of IBA, produced the greatest leave number. In Chinese hibiscus/“Jeanne d’Arc” combination, higher root number and dry weight of roots were observed. Interactions of kinds of rootstock and IBA concentration showed that the highest healing percentage was obtained in “Blue Stain” in concentration of 5000 ppm and the highest root number were seen in stentlings with “Jeanne d’Arc” in 3000 ppm and “Jeanne d’Arc” in 5000 ppm.

A Fixed Point Method for Convex Systems  [PDF]
Morteza Kimiaei, Farzad Rahpeymaii
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.330189
Abstract: We present a new fixed point technique to solve a system of convex equations in several variables. Our approach is based on two powerful algorithmic ideas: operator-splitting and steepest descent direction. The quadratic convergence of the proposed approach is established under some reasonable conditions. Preliminary numerical results are also reported.
Groundwater Quality Assessment Based on WQI and Its Vulnerability to Saltwater Intrusion in a Coastal City, Iran  [PDF]
Salman Tavassoli, Farzad Mohammadi
Journal of Geoscience and Environment Protection (GEP) , 2017, DOI: 10.4236/gep.2017.56010
Abstract: The purpose of this paper was to assess the quality of groundwater in Behshahr (Iran) based on water quality index (WQI). Sixteen water samples from this coastal aquifer were collected and analyzed to study physico-chemical parameters such as pH, hardness, chloride (Cl), electrical conductivity (EC) and total dissolved solids (TDS). The results showed that the annual average of TDS value increased by 343 mg/l between 1999 and 2015 due to anthropogenic activities. According to WQI, it was concluded that the groundwater quality degraded over the last sixteen-year period so that the percentage of samples identified as “good water” decreased by 18.5% and on the other hand, alas, the percentage of “poor water” quality soared by nearly 12.5%. Correspondence of WQI distribution diagram with that of chloride-bicarbonate ratio attests to the significant contribution of saltwater intrusion to groundwater quality deterioration in this area.
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