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Search Results: 1 - 10 of 21063 matches for " Seyed Ali Akbar Sajadi "
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Metal ion–binding properties of the L-aspartic acid and tartaric acid, a coparative investigation. How can be increased the dosage of mineral absorption in the body  [PDF]
Seyed Ali Akbar Sajadi
Advances in Bioscience and Biotechnology (ABB) , 2010, DOI: 10.4236/abb.2010.14047
Abstract: A comparative research has been developed for acidity and stability constants of M(TTA)1 and M(Asp)2 complexes which have been determined by potentiometric pH titration. Depending on metal ion–binding properties, vital differences in building complex were observed. The present study shows that in M(TTA) complexes, metal ions are coordinated to the carboxyl groups, but in M(Asp) some metal ions are able to build macrochelate over amine group. Hence, the following intermolecular and as a result independent concentration equilibrium between an open–isomer M(Asp)op and a closed–isomer M(Asp)cl, has to be considered cl op. The amounts are reported. The results mentioned above demonstrate that for some M(Asp) complexes the stability constants is also largely determined by the affinity of metal ions for amine group. This leads to a kind of selectivity of metal ions and transfer them via building complexes with the aspartate. The result of this effect is a higher dosage-absorption of minerals in body. Based on the sort of metal ions, the drug-therapy can be different. For heavy metal ions this building complex helps the absorption and filtration of the blood plasma, and consequently the excursion of heavy metal ions takes place. This is an important method in microdialysis. Other metal ions such as the complexes can be considered as mineral carriers. These complexes in certain conditions (PH–range) can release the minerals in body.
A comparative investigation of interaction between metal ions with L-methionene and related compounds such as alanine, leucine, valine, and glycine in aqueous solution  [PDF]
Seyed Ali Akbar Sajadi
Advances in Bioscience and Biotechnology (ABB) , 2010, DOI: 10.4236/abb.2010.1109
Abstract: The acidity and stability constants of M-L (M: M2+; L: Met, L-methionine) complexes, determined by potentiometric pH titrations, were used to make a comparative investigation. The stability constants of the 1:1 complexes formed between M2+ and L–, were determined by potentiometric pH titration in aqueous solution (I = 0.1 M, NaNO3, 25°C). The order of the stability constants was reported. It is shown that regarding to M ion – binding properties, vital differences on complex bilding were considered. It is demonstrated that in M-L complexes, M ion is coordinated to the carboxyl group, is also able to bild macrochelate over amine group. The aforementioned results demonstrate that for M (Met) complex, the stability constants are also largely determined by the affinity of Cu ion for amino group. It is indicated that this additional interaction with amino groups can influence the character of some amino acid complexes in biological systems.
UPFC Location and Performance Analysis in Deregulated Power Systems
Seyed Abbas Taher,Ali Akbar Abrishami
Mathematical Problems in Engineering , 2009, DOI: 10.1155/2009/109501
Abstract: We deal with the effect of Unified Power Flow Controller (UPFC) installation on the objective function of an electricity market. Also this paper proposes a Novel UPFC modelling in OPF which facilities the consideration of the impact of four factors on power market. These include the series transformer impedance addition, the shunt reactive power injection, the in-phase component of the series voltage and the quadrature component of the series voltage. The impact of each factor on the electricity market objective function is measured and then compared with the results from a sensitivity approach. The proposed sensitivity approach is fast so it does not need to repeat OPF solutions. The total impacts of the factors are used to offer UPFC insertion candidate points. It is shown that there is a clear match between the candidate points of the sensitivity method and those proposed by the introduced UPFC modelling in our test case. Furthermore, based on the proposed method, the relation between settings of UPFC series part and active and reactive power spot prices is presented.
Cognitive Task Complexity and L2 Narrative Writing Performance
Ali Akbar Khomeijani Farahani,Seyed Reza Meraji
Journal of Language Teaching and Research , 2011, DOI: 10.4304/jltr.2.2.445-456
Abstract: The present study was an attempt to chart the effects of two task design features, namely pre-task planning time and immediacy on written narrative performance. This is of pronounced importance since the synergistic effects of these two task features have gone largely unheeded in task-based research except for a smattering of studies (e.g., Gilabert, 2007). Accordingly, 123 participants were assigned to one of the 4 groups in the study, i.e., No planning & Here-and-Now, No planning & There-and-Then, Planning & Here-and-Now, and Planning & There-and-Then to write out a narrative task based on a series of pictures. The participants’ output was coded and measured for grammatical accuracy, syntactic complexity, lexical complexity, and fluency. Results showed that only pre-task planning time significantly promoted grammatical accuracy albeit with a small effect size. Pre-task planners complexified their discourse more than no-planners. In addition, displacedness of time and space coupled with pre-task planning led to significantly higher gains in syntactic complexity. However, lexical complexity measures did not yield any significant results across the groups of participants. Finally, both provision of pre-task planning time and immediacy of time and space led to significantly more fluent production.
Early Marjolin’s Ulcer after Minimal Superficial Burn
Ali Akbar Mohammadi,Seyed Morteza Seyed Jafari,Masoud Hosseinzadeh
Iranian Journal of Medical Sciences , 2013,
Verona Service Satisfaction Scale- 32 (VSSS-32): PersianTranslation and Cultural Adaptation
Ali Akbar Nejatisafa,Seyed jafar Mousavinia,Yasamin Mottaghipour,Vandad Sharifi
Iranian Journal of Psychiatry , 2008,
Abstract: "n Objective: "n To translate Verona Service Satisfaction Scale-32 (VSSS-32) to Persian, to adapt it for Iranian culture and to investigate the performance characteristics of the Persian version intended to measure patient satisfaction with psychiatric care. "nMethod: The VSSS-32 was translated to Persian using an elaborated methodology according to World Health Organization guideline. In addition, understandability and feasibility, of the measure were investigated in 121 patients and 74 relatives. "nResults : Few changes or few adaptations were made to bring about crosscultural comparability. The VSSS-32 questions were generally understandable and acceptable for Iranian patients and relatives. The instrument was feasible to be administered in both participants and interviewers point of view. "nConclusion: The VSSS-32 Persian version appears to be a good crossculturally equivalent of the original English version. Understandability and applicability of the instrument was good.
The Case Report of a Survival from Ekiri Syndrome
Seyed Mehdi Monajemzadeh,Sheedeh Assar,Ali Akbar Momen
Iranian Journal of Pediatrics , 2007,
Abstract: Background: Lethal toxic encephalopathy of shigellosis (Ekiri syndrome) is a rare complication of the shigella infection presented with fever, severe toxicity, seizure and diffuse brain edema, coma and death in the absence of dehydration and is nearly always lethal. This report is about a child who has survived the Ekiri syndrome.Case presentation: A three-year old child was admitted to the emergency ward because of fever, one attack of generalized tonic-clonic seizure, drowsiness and diarrhea with no signs of dehydration. The differential diagnosis was meningitis, shigellosis and atypical febrile convulsion. All test results for blood, urine, stool and cerebro-spinal fluid samples were normal except for serum sodium (119 mmol/l) and stool exam (many RBCs). He was treated with anticonvulsants because of the recurrent seizures and ceftriaxone with probability of shigellosis. The emergency brain CT scan showed diffuse brain edema. After 48 hours the consciousness was improved. Stool culture showed the growth of Shigella flexneri. Second brain CT scan revealed a dramatic decrease of the brain edema.Conclusion: Because neurological symptoms are among the extra intestinal complications of the shigellosis, it is recommended to put this disease in the list of differential diagnosis of unexplained neurological signs in endemic areas and consider the specific medications in the treatment programs.
Effect of treating helicobacter pylori infection on seizure frequency in patients with refractory epilepsy
Ali Akbar Asadi-Pooya,Seyed Mohsen Dehghani,Mehrdad Emami
Iranian Journal of Neurology , 2011,
Abstract: Background: The main purpose of the current study was todetermine the effect of treating helicobacter pylori (HP)infection on seizure frequency in patients with refractoryepilepsy.Methods: A small sample of adult patients above 18 years ofage with a diagnosis of refractory epilepsy was studied atthe outpatient epilepsy clinic at Shiraz University of MedicalSciences, from January 2009 through June 2011. If and whenurea breath test result was positive, an upper endoscopywith multiple gastric biopsies was requested. Rapid ureasetest and histopathology examination were performed. Forpatients with confirmed HP infection, treatment withclarithromycin, amoxicillin and omeprazole was ordered fortwo weeks. Seizure frequency was recorded before and afterHP treatment.Results: Nine patients were recruited. Using Wilcoxonsigned ranks test, seizure frequency did not differsignificantly after HP treatment compared to the periodbefore treatment (P = 0.6).Conclusion: Treating HP infection in patients withrefractory epilepsy did not significantly change the seizurefrequency.
Comparison of osteoblast cells growth in flat and long bones in mice and rabbits
Behzad Yasrebi,Samideh Khoei,Seyed Mahmoud Tabatabaei,Ali Akbar Malekirad
Koomesh , 2011,
Abstract: Introduction: Several in vitro studies have shown the effect of external stimulus on acceleration of long bone fracture repair in experimental animals. The aim of this study was to determine feasibility and creation of appropriate conditions for proliferation of the bone cells, in flat and long bones of mice and rabbits . Materials and Methods: Mice and rabbits flat and long bones were cultured in 12 plates. At 14th day of culture, they reached an appropriate level of cell growth. Then specific staining methods were used to study the pattern of cell growth. Results: The results showed a significant differences (P<0.05) in the number of proliferated flat bone (Calvaria) and long bone (Tibia) of rabbits in the first, second and third weeks of cell cultures. The highest rate of growth was observed in the third week in both bones. Similar differences were found in mice. The highest rate of growth in calvaria and tibial bones of mice were found in the second and third weeks, respectively. Conclusion: It seems that growth and proliferation rate of flat bones in mice and rabbits spread more quickly than their lone bones. Thus, this point should be taken into account in the in vitro study of repair pattern of bone tissue.
Investigating the barriers on media privatization
Seyed Mohammad Dadgaran,Ali Akbar Farhangi,Reza Najafbeigi,Roghiyeh Jame
Management Science Letters , 2013,
Abstract: During the past few years, there has been growing interests in reducing cost of products and services among developing countries. Privatization is believed to be one of the most important techniques to increase relative efficiencies of publically held organizations. In this paper, we study important barriers on privatization of television (TV) media industry in Iran. The proposed study of this paper designs and distributes a questionnaire using a sample of 234 out of 600 graduate students who were enrolled in media communication studies and examined six hypotheses based on one-side t-student. The survey considers different factors influencing privatization of TV media industry. The results of the investigation indicate that the cost of TV production, short and long-term investment security, people's interest on investing on TV media industry, building appropriate culture, cultural obstacles and economic barriers influence media privatization, significantly.
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