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Search Results: 1 - 10 of 149809 matches for " H . Dadras "
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Experimental Assessment of the Pathogenicity of Avian Influenza Virus H9N2 Subtype in Japanese Quail (Coturnix Coturnix Japanica)
Keshtkar, M.,Nili, H.,,Dadras, H.,Asasi, K.
Archives of Razi Institute , 2010,
Abstract: H9N2 avian influenza A viruses are endemic in poultry of many Eurasian countries and have caused repeated human infections in Asia since 1998. It has been also reported that H9N2 can cause high mortality in commercial broiler farms in Iran previously. However there was no report of H9N2 outbreak in any other species. In order to evaluate the pathogenicity of H9N2 virus in Japanese quail, 145 Japanese quail were randomly divided into 5 separate groups (116 quails in the treatment and 29 quails in the control groups). The experimental groups infected via oral rout, eye drop, intramuscular injection and spray method at the age of 32 days with 106.5 EID50/bird. The virus A/chicken/Iran/ZMT-101/98(H9N2) was kindly provided obtained from Razi vaccine& serum institute with EID50=108. The blood samples were experimented the day before use to show freedom from antibodies to influenza A and more specifically, the H9 subtype. The clinical signs and antibody titer of the infected chicks were also monitored. Five birds of each group were bled at 10 and 20 days post infection (DPI), and 20 birds of each group at 30 DPI were bled. The immune response to infection was measured by Haemmaglutination Inhibition (HI) test using the H9N2 virus as antigen. Feed & water consumption were recorded on daily bases before and after inoculation. Body weight of each group was also recorded on weekly bases before and after inoculation. During the current study clinical signs such as sneezing, gasping, depression observed in challenged groups followed by decreasing in laying (1-17%). High HI antibody titers of AIV subtype H9 was seen in 10 DPI. The quails exhibited no decrease in food and water consumption and all quails were growing well and did not show any abnormality.
Role of Infectious Bronchitis Live Vaccine on Pathogenicity of H9N2 Avian Influenza Virus
M. Haghighat-Jahromi,K. Asasi,H . Nili,H . Dadras
International Journal of Poultry Science , 2007,
Abstract: Based on experimental inoculation of chickens and sequence of amino acids at cleavage site, H9N2 AIV is pathotyped as low pathogenic avian influenza virus. But our extensive field experiences during last decade show serious disease problems and high mortality associated with this subtype in some Asian countries. One of the possible explanations for such a high mortality and great economic losses could be circulation of the virus and mixed infection with other respiratory pathogens. Infectious Bronchitis Live Vaccine (IBLV) is being used broadly in chicken farms of these countries. So it was decided to experimentally study the effect of infectious bronchitis live vaccine (H120) on enhancing of pathogenicity of H9N2 in broiler chicks. Clinical signs, gross lesions, viral shedding and mortality rate were compared between groups. Results of the present study showed that co-infection of IBLV with H9N2 AI virus not only increased the severity of H9N2 AIV clinical sings and gross lesions; but also increased the mortality rate and extended viral shedding period of H9N2 avian influenza virus.
The effect of cations on sperm motility performance and fertilizing ability of silver carp Hypophtalmychtis molitrix
Khara H.,Shahrooz Baradaran N.,Hadiseh Dadras,Rahbar Mina
Acta Veterinaria , 2012, DOI: 10.2298/avb1206599k
Abstract: The objective of the study was to investigate the effect of saline solution containing cations (Na+, K+, Ca+2, Mg+2) on sperm motility performance (duration of sperm motility and percentage of motile spermatozoa) and fertilizing capacity of sperm (fertilization rate, hatching rate, larvae length during hatching, larvae length during active feeding and survival rate) in silver carp. The results suggested that solutions containing ions did not improve the duration of sperm motility. The same was observed for the percentage of motile spermatozoa. Fertilization rate influenced by solutions containing Ca+2, and other ions could not affect this parameter. The results showed that hatching rate was higher in solutions containing 99 mEq/L NaCl, 2 mEq/L MgCl2 and 2, 4 mEq/L CaCl2 respectively. Also, survival rate was higher in the solution containing 2 mEq/L MgCl2 and 36 mg/dL KCl respectively.With regard to the obtained results, it was concluded that using appropriate activation medium can improve quality of fish sperm and subsequently increases artificial reproduction performance.
Pathological Findings of Highly Pathogenic Avian Influenza Virus A/Duck/Vietnam/12/2005 (H5N1) in Turkeys
M.J. Mehrabanpour,H. Dadras,A. Khodakaram-Tafti,A. Rahimian
International Journal of Poultry Science , 2007,
Abstract: The aim of present study was to identify the clinical signs, gross and histopathological findings in turkeys experimentally infected with highly pathogenic avian influenza virus A/duck/Vietnam/12/2005 (H5N1). Specific pathogens free of white turkeys having 6 weeks old were inoculated with 0.1 mL of the virus with 105 EID50. Death was event at 3 DPI. Gross lesions observed after necropsy were splenomegaly, pulmonary edema, severe congestion in lungs, hyperemia in brain as well as cecal-tonsil and congestion in skeletal muscle. Histopathological finding were multi organ necrosis and/or inflammation. The most consistent and severely affected organs were spleen, lungs, brain, pancreas and cecal-tonsil. It would be worth to mention that the lungs and spleen were most affected organs, among the others grossly and histopathologically, However to our knowledge, this is the first description of histopathological finding of highly pathogenic avian influenza virus A/Duck/Vietnam/12/2005 (H5N1) in turkey.
Nano filaments (CNT & CNF) and 123 systems
S Dadras,V Daadmehr
Iranian Journal of Physics Research , 2009,
Abstract: The effects of carbon nano filaments on the superconducting properties of Y-123 compound were studied. Samples were synthesized using standard solid-state reaction technique by adding CNT up to 1 wt %. The XRD data confirm the single phase orthorhombic structure for all the samples. The SEM of samples shows existence of CNTs which can powered the weak links that increase the . We obtained changes in critical temperature , by changing CNT doping amount in Y-123 systems, and TC have an optimum in 0.3 wt% CNT doping .
The comparsion of propofol with thiopental as induction drug on neonatal apgar during elective cesarean section
Maziar Mahjoobifard,Mohammad M. Dadras,Abdollah Panahipoor,Mohammad A. Dadras
Zahedan Journal of Research in Medical Sciences , 2011,
Abstract: Background: Neonatal Apgar at birth is one of the leading factors of postnatal mortality. One of the factors affecting neonatal Apgar after cesarean section is the anesthetic drug. Propofol is better than thiopental to prepare patient for cesarean section but this is a controversial issue because of its side effects. We conducted this study to evaluate thiopental and propofol effects on neonatal Apgar score, maternal nausea and vomiting and maternal recovery time after anesthesia.Materials and Method: After the approval of university ethics committee, 230 otherwise healthy women without fetal problems who were candidates for elective cesarean section under general anesthesia entered into the study. They were randomly divided into two groups to induce anesthesia with either propofol or thiopental. Other treatments were the same in two groups during anesthesia. First and fifth minute Apgar score, maternal recovery time and post operative nausea and vomiting were recorded.Results: Data was analyzed digitally using SPSS-18 using chi-squared and student t-tests. Results show that 1st and 5th minute Apgar score were significantly higher in propofol group compared with thiopental. Recovery time was not different statistically in two groups. Nausea and vomiting was encountered less frequently in propofol group than thiopental.Conclusion: It seems that in elective cesarean section in which there is no danger to mother and neonate without any contraindication, propofol may be useful as an anesthetic inducing agent. Despite its less effect on the neonatal Apgar score, it induces less post operative nausea and vomiting for mothers
Effect of Preoperative Oral Celecoxib on Pain Reduction in Elective Patients for Leg Surgery
Mohammad Mehdi Dadras,Shahram Borjeian,Masoum Khoshfetrat,Mohammad Amin Dadras
Zahedan Journal of Research in Medical Sciences , 2013,
Abstract: Background: Acute pain intensity after surgical operation is an important predictor of the chronic post-operation pain. Thus, controlling acute pain can play an important role during the convalescence of the patient after surgery. Preemptive analgesia indicates that if controlling the pain process starts before onset of the painful process, it will be more effective than after onset of the painful process. This study was designated with regard to the importance of controlling pain and special properties of celecoxibs. Materials and Methods: As a double-blind clinical trial, the study was conducted on 80 people who have undergone leg surgery. Patients were divided into two 40-member groups and were treated with 200 mg celecoxib or placebo two hours before surgery. The statistical blocks were used for randomization purposes. Both the patient and the person who was responsible for checking the pain intensity and opioid intake were not informed on the prescribed medicine. After the surgery was wrapped up, the patient’s pain intensity was estimated based on Visual Analog Scale (VAS) 2, 6, 12 and 24 hours after surgery. After 24 hours, the uptake amount of the consumed opoid was recorded in the information form. Results: The difference in VAS of patents two hours after surgery was not significant statistically (p=0.2); while in celecoxib group it became significantly lower than placebo group in the hours 6 (p=0.038), 12 (p=0.037) and 24 (p=0.038) after surgery. Also pethidine intake has been significantly decreased (p=0.042) in celecoxib group compared to the placebo group. Conclusion: Taking 200 mg celecoxib two hours before operation will decrease significantly pain intensity and opoid intake after surgery.
Comparing Propofol with Sodium Thiopental on Neonatal Apgar Score after Elective Cesarean Section
Mohammad Mehdi Dadras,Maziar Mahjoobifard,Abdollah Panahipoor,Mohammad Amin Dadras
Zahedan Journal of Research in Medical Sciences , 2013,
Abstract: Background: The Apgar score (Appearance, Pulse, Grimace, Activity, and Respiration) of newborn babies immediately after birth is a determining factor involved with mortality of newborns after birth. Regarding the disagreement on advantages and possible disadvantages of propofol rather thiopental in the available references, the study was triggered with the aim of analyzing effects of two mentioned drugs on babies’ apgar score, mothers’ nausea, vomit and time necessary for mothers’ recovery. Materials and Methods: In this double-blind clinical trial, a total of 230 healthy women who were volunteered to undertake cesarean operation were selected and then divided randomly into two equal groups using statistical blocking. One group was treated by propofol while other one was treated by thiopental. The prescribed drugs for both groups were identical except the anesthesia induction drug. Babies’ Apgar score 1 and 5 minutes after birth and recovery period, mothers’ nausea and vomiting after operation were recorded. Results: Apgar score I minute 1 (p=0.041) and apgar score in minute 5 (p=0.034) for propofol group were meaningfully higher than those for thiopental group. Recovery time from anesthesia was not different meaningfully in two groups (p=0.67). Statistical analysis of nausea and vomit in both groups showed that they are lower in propofol group rather thiopental group (p=0.028).Conclusion: It seems that in cesarean operations, after sufficient fluid therapy, propofol can be a proper drug to achieve anesthesia. Moreover it exerts less impact on cesarean babies’ apgar and stimulates lower levels of nausea and vomiting in mothers.
Generating one-, two-, three- and four-scroll attractors from a novel four-dimensional smooth autonomous chaotic system

Sara Dadras,Hamid Reza Momeni,

中国物理 B , 2010,
Abstract: A new four-dimensional quadratic smooth autonomous chaotic system is presented in this paper, which can exhibit periodic orbit and chaos under the conditions on the system parameters. Importantly, the system can generate one-, two-, three- and four-scroll chaotic attractors with appropriate choices of parameters. Interestingly, all the attractors are generated only by changing a single parameter. The dynamic analysis approach in the paper involves time series, phase portraits, Poincar\'{e} maps, a bifurcation diagram, and Lyapunov exponents, to investigate some basic dynamical behaviours of the proposed four-dimensional system.
Assessment of Brain absorbed X-ray dose during CT- Scan using ImPACT software in Tehran Univeristy hospitals
Khalilpour M,Norouzzadeh SH,Dadras M
Tehran University Medical Journal , 2009,
Abstract: "n Normal 0 false false false EN-US X-NONE AR-SA MicrosoftInternetExplorer4 st1":*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:Arial; mso-bidi-theme-font:minor-bidi;} Background: CT scan was first introduced into clinical practice in 1972, and since then has grown into one of the predominant diagnostic procedures. In 1998, the UK National Radiological Protection Board reported that 20% of the national collective dose from medical X-ray examinations derived from CT-scans, although it represented only 2% of all X- ray examinations the aim of this study was to determine the X-ray dosage received by patients in brain CT scan."n"n Methods: In this work, we have estimated patient dose arising from CT examination of brain in five hospitals in Tehran. Organ and effective doses were estimated for 150 patients who underwent CT examination of brain. "ImPACT" version 0.99v was used to estimate organ and effective dose. Brain examinations were performed with fixed Kvp, mAs and T (slice thickness) for each scanner. "n"n Results: Patients, who were scanned by CT of emam Khomeini center (Toshiba Xvision /EX Scanner), received maximum organ dose (brain) and minimum organ dose was delivered to patients who were scanned by CT of amir alam center (Toshiba Xvision /EX Scanner). Maximum effective dose was 1.7 mSv acquired in this study for emam Khomeini haspital, smaller than the corresponding value obtained by National Radiation Protection British (NRPB)."n"n Conclusions: In two research centers with a system, the obtained results of measurement of effective dose and organ dose show utilization method of system and its measure of Kvp & mAs is very important factor in comparison with type of system. Because there are both minimum dose and maximum dose in two different centers.
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