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Search Results: 1 - 10 of 1632 matches for " Fatemeh Hassani "
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The role of earnings management and dividend announcement in explanation of information asymmetry: Evidence from Tehran Stock Exchange
Mohammad Hassani,Fatemeh Taheri
Management Science Letters , 2012,
Abstract: This study examines the relationship between earnings management and information asymmetry based on some companies listed in Tehran Stock Exchange over the period of 2005-2010. The study only uses qualified samples by taking into account all limitations and necessary criteria. Based on the results of this survey, we can conclude that there is not a significant relationship between earning management and information asymmetry in Tehran Stock Exchange. There is also not a significant relationship between low or high earning management and information asymmetry. Estimated dividend announcement has information content and it can influence on information asymmetry. Finally, in Tehran Stock Exchange, there is information asymmetry and after dividend announcement, its value is more than before.
Heavy Metal Distributions in Water of the Aras River, Ardabil, Iran  [PDF]
Fatemeh Nasehi, Amirhesam Hassani, Masoud Monavvari, Abdoreza Karbassi, Nematollah Khorasani, Aliakbar Imani
Journal of Water Resource and Protection (JWARP) , 2012, DOI: 10.4236/jwarp.2012.42009
Abstract: Aras (situated on the frontier river) is one of Iran’s important rivers which is situated on the west North of the country. The concentration of heavy metals in this river was studied around Ardabil province during the 1389 in all four seasons (spring, summer, autumn, winter). The cluster analysis technique with the help of the results gained from density of metals like (Zn, Cu, Fe, Hg, Ni, Pb, Cd) was used in the water of Aras river for classifying quality of the river. Accord- ing to the gained results from the cluster analysis, the stations were divided into three groups with high pollution (HP), medium pollution (MP) and low pollution (LP). In general, S3, S5 stations with high pollution, S2, S4 stations with medium pollution and S1 station with low pollutions are classified in the water of Aras River.
Effects of patient age, duration and cause of infertility and number of pre-ovulatory follicles on intrauterine insemination outcomes
Hassan Hassani Bafrani,Maasoomeh Abedzadeh,Fatemeh Fruzanfard,Zoreh Tabasi
Koomesh , 2010,
Abstract: Introduction: Prevalence of infertility in general population is around 15-10 percent. Intra- uterineinsemination (IUI) is one method for treatment of infertility. Success rate of this method is affected bydifferent factors. Past studies have shown that induction of ovulation and IUI has increased significantlythe chance of pregnancy in the infertile couple, especially male factor infertility. The aim of this studywas to investigate the success rate of IUI and associated factors in Kashan fertility and sterility center.Material and Methods: Data from 120 patients (age between 20 and 42 years) who were referred toKashan Infertility Center (Iran) during 2005-2009 were studied. According to the World healthOrganization instructions, semen samples of patients were prepared using swim-up and percoll gradienttechniques. After preparation of sample, sperm motility and sperm count were performed. One ml ofsperm suspension was expelled into uterine cavity.Results: Pregnancy rate of women with less than 40 years was significantly more than older womenwere (P<0.007). Pregnancy rate in infertility duration of less than 6 years was significantly more than thelonger duration of infertility (P<0.005). Pregnancy rate in patients with unknown cause of infertility15.3%, but in patients who had endometriosis, pregnancy rate was significantly lower (P<0.05). In cycleswith a single pre-ovulatory follicle the pregnancy rate was significantly lower than in cycles with morefollicles (P<0.05).Conclusion: This study showed that in infertile patients with less than 40 years of age, duration ofinfertility less than 6 years and infertility with non-endometriosis origin, IUI using Clomiphene citrateand HMG is a suitable method for treatment of infertility.
DNA Binding and Antitumor Activity of α-Diimineplatinum(II) and Palladium(II) Dithiocarbamate Complexes
Hassan Mansouri-Torshizi,Maryam Saeidifar,Fatemeh Khosravi,Adeleh Divsalar,Ali Akbar Saboury,Fatemeh Hassani
Bioinorganic Chemistry and Applications , 2011, DOI: 10.1155/2011/394506
Abstract: The two water-soluble designed platinum(II) complex, [Pt(Oct-dtc)(bpy)]NO3 (Oct-dtc = Octyldithiocarbamate and bpy = 2,2′ -bipyridine) and palladium(II) complex, [Pd(Oct-dtc)(bpy)]NO3, have been synthesized and characterized by elemental analyses, molar conductivity measurements, IR, NMR, and electronic spectra studies. Studies of antitumor activity of these complexes against human cell tumor lines (K562) have been carried out. They show Ic50 values lower than that of cisplatin. The complexes have been investigated for their interaction with calf thymus DNA (CT-DNA) by utilizing the electronic absorption spectroscopy, fluorescence spectra, and ethidium bromide displacement and gel filtration techniques. Both of these water-soluble complexes bound cooperatively and intercalatively to the CT-DNA at very low concentrations. Several binding and thermodynamic parameters are also described. 1. Introduction In order to reduce the toxicity of cisplatin, that is, the well-known anticancer drug, and modulate its activity, a new strategy is the design of novel metal complexes containing N and S donor ligands [1–3]. This interest has probably initiated from detoxicant properties of sulfur-containing ligands against heavy metal intoxication [4]. As an example is the use of sodium diethyldithiocarbamate (DDTC) in the treatment of patients with acute poisoning of nickel carbonyl, arsenic, and thallium [5]. A further interest in this chelating ligand has arisen due to its highly selective use to protect a variety of animal species from renal, gastrointestinal, and bone marrow toxicity, induced by cisplatin without inhibition of cisplatin’s antitumor effect [6–9]. In addition, diethyldithiocarbamate has remarkable property of reversing platinum binding to macromolecules responsible for host toxicity. However, it does not interfere with the tumoricidal Pt-DNA interaction in the tumor cell. Thus, the protective action of the dithiocarbamate against the toxicity of cisplatin seems to be the formation of its stable platinum dithiocarbamate complexes [7, 10]. A large number of analogs of cisplatin have been tested, and it has been reported that many active complexes could react with cell DNA and inhibit its synthesis [11–14]. Recently, significant attention has been focused on the DNA binding properties of dithiocarbamate metal complexes [15–17] and several dithiocarbamate derivatives have been investigated as potential biologically active agents [18–23]. Among which platinum and palladium complexes of dithiocarbamates have gained considerable interest due-to-their potential
Performance Improvement in Amplitude Synthesis of Unequally Spaced Array Using Least Mean Square Method
S. Kazemi;Hamid Reza Hassani;Gholamreza R. Dadashzadeh;Fatemeh Geran Gharakhili
PIER B , 2008, DOI: 10.2528/PIERB07103002
Abstract: In this paper, an efficient method to obtain the elements current distribution for a non uniformly spaced array is presented. For a given far field pattern, after sampling the array factor the proposed method uses the least mean square error technique to solve the system ofequations rather than solving the previously published Legendre function method. It's shown that the average side lob level obtained by this proposed method is some 5 dB lower in comparison with the existing Legendre function method ofsolution. Ifthe Legendre function method published in the literature is to be used to solve for the current distribution, in the final part ofthis paper, a criteria on how to choose suitable vectors that would result in a 3 dB lower side lobe level performance will be provided.
Nitric Oxide-Induced Polycystic Ovaries in The Wistar Rat
Fatemeh Hassani,Manizheh Karami,Mohammad Reza Jalali Nadoushan,Poopak Eftekhari Yazdi
International Journal of Fertility & Sterility , 2012,
Abstract: Background: Nitric oxide (NO) involves in polycystic ovary syndrome (PCOS), a causeof infertility in women during the reproductive age. The PCOS is now categorized as aninflammatory phenomenon. The aim of this study was to evaluate the role of NO, a proinflammatoryagent, in this syndrome at histological and biochemical levels.Materials and Methods: In this experimental study, animals were female Wistar rats(weighing 200-250 g) kept under standard conditions. L-Arginine (50-200 mg/kg), a precursorof NO, was injected intra-peritoneally (i.p.) through a period ranging from 9 to14 days/once a day. The rats' estrous cycle was studied using Papanicolaou test; those showing phaseof Diestrous were grouped into experimental and control groups. The control group solelyreceived saline (1 ml/kg, i.p.) throughout all experiments. To evaluate the inflammatory effectof NO, the rats were treated an anti-inflammatory agent, naloxone hydrochloride (0.4 mg/kg,i.p.), prior to L-arginine. At the end of the treatment period all animals’ ovaries were assessedfor histopathological and histochemical investigations. Also, activation of NO synthase (NOS)in the experiments was studied using NADPH-diaphorase technique.Results: The ovaries of rats treated with L-arginine showed polycystic characteristics incontrast to those collected from control or naloxone pretreated groups, based on image analysis.A difference in enzyme activation was also shown in the sections that belonged to thegroups that received L-arginine when compared with the pre-naloxone and control groups.Conclusion: Based on these results, we believe that NO may play a major role in thepathophysiology of PCOS.
Evaluation of genetic diversity among some wild populations of Achillea bieberstenii Afan. from Iran using morphological and agronomical traits
Seyed Fazel Mirahmadi,Mohammad Reza Hasandokht,Mohammad Esmail Hassani,Fatemeh Sefidkon
International Journal of Forest, Soil and Erosion , 2012,
Abstract: In this study, genetic diversity among 25 populations (each population 6 plants) of Achillea bieberstenii Afan. collected from 12 provinces of Iran using a total of 35 morphological and agronomical characteristics including 31 quantitative and 4 qualitative traits was evaluated as an important step for possible use in the breeding programs of this medicinal plant. According to the results of analysis of variance, there were significant differences among the studied populations for some important characters. Also, results of simple correlation analysis were shown the significant positive and negative correlations among some important characters. Factor analysis was also used for defining of the determinant factors and the characters constituted in each factor. In Principal component analysis (PCA), 10 main and independent factors with over Eigen values than two explained 85.36% of the total variation related to main effective characters. Based on the constructed dendrogram, 25 populations of A. biebersteinii were clearly divided into 11 main clusters. Groups mainly have differences in yield and yield components. In this investigation not only was observed high variation for studied morphological characteristics but also some native populations were clearly shown their valuable breeding potential in some agronomical traits for breeding programs and medicinal purposes.
Effect of β-Mercaptoethanol with and without BSO (DL-Buthionine Sulfoximine) on Resumption of Meiosis, in vitro Maturation and Embryo Development of Immature Mouse Oocytes
Hossein Eimani,Fatemeh Hassani,Seyed Ali Haerie-Rohani,Mohammad Hossein Nasr Esfahani
Cell Journal , 2006,
Abstract: Introduction: The purpose of this study was to evaluated the effect of β-mercaptoethanol on resumption of meiosis, in vitro maturation of immature mouse oocytes and resulting embryo development with and without BSO (DL-Buthionine sulfoximine). Material and Methods: Germinal vasicle (GV) were recovered from 6-8 weeks old NMRI ovaries and cultured in maturation medium in MEMα supplemented with 7.5IU/ml hCG, 100mIU/ml rhFSH, 5% FCS (control group) and adding 100μm β-mercaptoethanol (group 1) or with 5mM BSO + 100μm β-mercaptoethanol (group 2) for 24h. The matured oocytes then were fertilized and cultured for 5 days. Fertilization and development were accomplished in T6 medium. Results: The percentage of GV oocytes reaching to metaphase I (or undergo GVBD) were 78.5%, 85%, 86% in control group, group 1 and group 2 respectively, that no significant difference was detected between groups. The proportion of oocytes that progressed to the metaphase II (MII) stage was minimum within 5mM BSO group (group 2) and maximum within β-mercaptoetanol group (group 1) with significant difference comparing with control and each other (P≤0.05). The percentage of embryos reaching to morula stage within β-mercaptoetanol group was significantly higher than the control group (5% and 12.2% respectively). None of oocytes treated with BSO could pass the 8 cell stage. Conclusion: β-mercaptoetanol enhances IVM and improves embryo development. While adding BSO into the maturation medium even with β-mercaptoetanol decreases maturation and declines the embryo development.
Maxillary Distraction Osteogenesis  [PDF]
Mohammad-Esmaiil Hassani, Hamid Karimi, Hosein Hassani, Ali Hassani
Surgical Science (SS) , 2015, DOI: 10.4236/ss.2015.62003
Abstract:

Background: Distraction Osteogenesis is popular for long bones. And nowadays it has found its role in facial bone deficiency treatments. Purpose: We used our special designed Distractor for advancement of Maxillary deficiencies in cleft lip and palate patients. The purpose of this paper is to compare the treatment of hypoplastic, posteriorly retruded maxillary of cleft palate patients using distraction osteogenesis vs. Le fort I orthognathic surgery for length of advancement, stability and relapse, growth after distraction and soft tissue expansion and soft tissue profile changes. Meterial & Methods: In group A only Le fort I and surgical maxillary advancement sometimes with bone graft were done. In group B we used our special Distractor for Distraction Osteogenesis and advancement of the Maxillary bone. Demographic data, length of retrusion of maxilla, time length of treatment, length of advancement and relapse, SNA and SNB angles were measured and included in the study. The results were compared in each group before and after advancement and between both groups. The rate of distraction was 0.5 mm twice per day to achieve normal occlusion with 2 mm overcorrection more than calculated measures. The devices removed after 10 weeks as latency period. Results: The SNA increased at the end of distraction (p < 0.001), with no significant relapse indicating stability at 1 year after treatment. The total length of advancement in group A was 17 ± 4 mm and in group B was 20 ± 3 mm. The difference between before and after measurements in each group was significant (p = 0.002, p = 0.003 respectively). The mean length of relapse in group A was 3 ± 1 mm and in group B was 1 mm. Discussion: For the deformities and retrusions less than 7 - 8 mm, the Orthognatic surgery is the treatment of choice, however for more retrusions (>10 mm) we recommend Distraction Osteogenesis, and it preferred to start it soon in younger ages.

Educational Advisor System Implemented by Web-Based Fuzzy Expert Systems  [PDF]
Mahdi Hassani Goodarzi, Vahid Rafe
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.57058
Abstract: Using of the Internet technology and the field of Fuzzy expert systems has proposed new branches of sharing and distributing knowledge. However, there has been a general lack of investigation in the area of web-based Fuzzy expert systems (FES). In this paper the issues associated with the design, development, and use of web-based FES from a standpoint of the benefits and challenges of developing and using them. The original theory and concepts in conventional FES were reviewed and a knowledge engineering framework for developing them was revisited. Student in an educational place need an educational advisor for solve problems. Some of educational circulars order changing because advisor must update information away. The student's request is linguistic and crisp Expert System cannot solve problems completely. In my approach we build Web-Based Fuzzy Expert System for Student Education Advisor (FES-SEA) and stays in university portal. This system implemented with ASP.NET, SQL-SERVER 2008.
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