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Search Results: 1 - 10 of 55 matches for " Mahvash Seifali "
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Systematic Study of Weedy Species of Setaria (L.) P. Beauv. (Poaceae) in Iran
Maryam Keshavarzi,Mahvash Seifali
Pakistan Journal of Biological Sciences , 2007,
Abstract: Weedy species of Setaria (L.) P. Beauv. (Poaceae, Panicoiodeae and Paniceae) compose one of the worst weed groups interfering with world agriculture and in other disturbed and managed habitats. These weed species (S. glauca, S. viridis and S. verticillata) form the foxtail species-group in Iran. In this study 30 populations from different part of Iran were collected. Morphological traits were studied. Some morphological characters as texture of upper lemma, awn color and ligule shape are used to differentiate Setaria species group in Iran. It is believed that these morphological traits have a lot of overlapping. Morphological variations were evaluated by multivariate statistical methods. This study shows the systematic value of different quantitative and qualitative characters in weedy Setaria species native to Iran. An identification key based on studied characters is provided.
A Morphological and Anatomical Study of an Annual Grass Eremopyrum (Poaceae) in Iran
Maryam Keshavarzi,Mahvash Seifali,Khadijeh Babaii
Pakistan Journal of Biological Sciences , 2007,
Abstract: Eremopyrum (Poaceae) is distributed in various habitats in Iran. This genus is an Irano touranian floristic element and is represented by five species in Iran. In the morphological study 55 quantitative and qualitative characters were evaluated in 26 populations. It was observed that length of lowermost and uppermost glumes and its awn, spike length and lodicules lengths are diagnostic characters. In anatomical studies, the cross sections of the leaf blade and dorsal epidermis were examined and the stomata index was calculated. Characters as frequency of short and silica cells, number of macro hairs, prickles, subsidiaries, shape and number of vascular bundles are diagnostic. Inter- and intra- specific variation in Eremopyrum is evaluated.
Systematic Study of Annual Weed Phalaris minor Retz. (Poaceae) in Iran
Maryam Keshavarzi,Mahnaz Khaksar,Mahvash Seifali
Pakistan Journal of Biological Sciences , 2007,
Abstract: Phalaris minor is an anuual grass in North temperate regions. This weed is inhabited in damp soils and swamps of Irano-Turanian phytogeographic region. Anatomical structure of leaf trans-sections, dorsal epidermis and morphological variation of 23 accessions of Phalaris minor from different parts of Iran were studied. Coastal and inter-coastal characters were evaluated and the intra-specific variations were studied. Results indicate a lot of variations in shape and wall thickness of long cells, the number and type of short cell, stomata number per leaf area, shape of silica bodies, guard cells and the presence of different kind of hairs. Also sclerenchyma position, the shape of midrib and furrows of leaf blade and the features of vascular bundles show a lot of variations. Different accessions show variations in shoot length and spike shape and length. The results indicate that there may be some ecotypes in Phalaris minor of Iran. Statistical analysis is provided for Iranian populations of weedy Phalaris minor.
Mitochondrial Genetic Differentiation of Spirlin (Actinopterigii: Cyprinidae) in the South Caspian Sea basin of Iran
Mahvash Seifali,Aziz Arshad,Faezeh Yazdani Moghaddam,Hamid Reza Esmaeili
Evolutionary Bioinformatics , 2012,
Abstract:
Mitochondrial Genetic Differentiation of Spirlin (Actinopterigii: Cyprinidae) in the South Caspian Sea basin of Iran
Mahvash Seifali, Aziz Arshad, Faezeh Yazdani Moghaddam, Hamid Reza Esmaeili, Bahram H. Kiabi, Siti Khalijah Daud and Mansour Aliabadian
Evolutionary Bioinformatics , 2012, DOI: 10.4137/EBO.S9207
Abstract: Background: Knowledge about Alburnoides remains lacking relative to many other species, resulting in a lack of a systematic position and taxonomic diagnosis. Basic biological information for Alburnoides has been constructed, and it is necessary to understand further and obtain more information about this species. Its phylogenetic relationships are still debated and no molecular data have been used to study this taxon in Iran. A holistic approach for genetic methods was adopted to analyze possible spirlin population differences at selected centers in the south Caspian Sea basin of Iran. Methods: The phylogenetic relationships were determined based on 774 base pairs of the mitochondrial cytochrome b gene of 32 specimens of spirlin from nine locations in the south Caspian Sea drainage basin of Iran. The nucleotide sequences were subjected to phylogenetic analysis using the neighbor-joining, maximum parsimony, maximum likelihood, and Bayesian methods. Results: The mitochondrial gene tree largely supports the existence of three major clades. The western populations (clade I) may be considered as Alburnoides eichwaldii, whereas the Talar river populations (clade II) are represented as Alburnoides sp.1 and the eastern populations (clade III) may be distinct taxa of Alburnoides sp.2. Conclusion: This molecular evidence supports the hypothesis that A. bipunctatus does not exist in the south Caspian Sea basin of Iran, and that the western and eastern populations are distinct taxa.
Evaluating teaching effectiveness in nursing education:An Iranian perspective
Mahvash Salsali
BMC Medical Education , 2005, DOI: 10.1186/1472-6920-5-29
Abstract: An exploratory descriptive design was employed. 143 nurse educators in nursing faculties from the three universities in Tehran, 40 undergraduate, and 30 graduate students from Tehran University composed the study sample. In addition, deans from the three nursing faculties were interviewed. A researcher-developed questionnaire was used to determine the perceptions of both faculty and students about evaluating the teaching effectiveness of nurse educators, and an interview guide was employed to elicit the views of deans of faculties of nursing regarding evaluation policies and procedures. Data were analyzed using parametric and nonparametric statistics to identify similarities and differences in perceptions within the Iranian nurse educator group and the student group, and between these two groups of respondents.While faculty evaluation has always been a major part of university based nursing programs, faculty evaluation must be approached more analytically, objectively, and comprehensively to ensure that all nursing educators receive the fairest treatment possible and that the teaching-learning process is enhanced.Educators and students stressed that systematic and continuous evaluation as well as staff development should be the primary goals for the faculty evaluation process. The ultimate goals is the improvement of teaching by nurse educators.The aims of nursing education principally center on the transmission of nursing knowledge, and assisting nursing students to acquire the necessary skills and attitudes associated with nursing practice. As with professional preparation generally, nursing education encompasses the three domains of learning, the cognitive, the affective, and the psychomotor. One way to enhance nursing education is to evaluate the effectiveness of teaching in nursing education programs. An interest in evaluating teaching effectiveness has increased over time and acceptance of the need to evaluate teaching has continued to grow. Defining what we m
Delay Performance Optimization for Multiuser Diversity Systems with Bursty-Traffic and Heterogeneous Wireless Links
Jalil Seifali Harsini,Farshad Lahouti
Mathematics , 2009,
Abstract: This paper presents a cross-layer approach for optimizing the delay performance of a multiuser diversity system with heterogeneous block-fading channels and a delay-sensitive bursty-traffic. We consider the downlink of a time-slotted multiuser system employing opportunistic scheduling with fair performance at the medium access (MAC) layer and adaptive modulation and coding (AMC) with power control at the physical layer. Assuming individual user buffers which temporarily store the arrival traffic of users at the MAC layer, we first present a large deviations based statistical model to evaluate the delay-bound violation of packets in the user buffers. Aiming at minimizing the delay probability of the individual users, we then optimize the AMC and power control module subject to a target packet-error rate constraint. In the case of a quantized feedback channel, we also present a constant-power AMC based opportunistic scheduling scheme. Numerical and simulation results are provided to evaluate the delay performance of the proposed adaptation schemes in a multiuser setup.
The effect of administrating hyoscine bromide on pregnancy rate before embryo transfer in ART cycles  [PDF]
Mahvash Zargar, Shiva Kajbaf, Masoud Hemadi
Open Journal of Obstetrics and Gynecology (OJOG) , 2013, DOI: 10.4236/ojog.2013.37105
Abstract:

Assisted reproductive technology methods i.e., IVF and ICSI were extensively used for treatment of infertility. Although, these methods have many advantages but ART pregnancy rate remains low (30% - 35%). It seems that uterine peristalsis occurred after rhCG administration in turn resulting to impair implantation of the transferred embryos. Therefore this study was conducted to possess of whether hyoscine bromide can effectively alleviate uterine contraction and then have any effect on the reproductive outcome. Healthy women who underwent IVF or ICSI cycles (n = 142) were randomly assigned to one of two groups at the start of the cycle. Group control (n = 71) without applied hyoscine and group experiment (n = 71) applied hyoscine (25 mg). Controlled ovarian hyperstimulation was induced with follicle stimulating hormone (FSH). Sperm preparation and ovarian puncture for in vitro maturation and fertilization (IVF) of oocyte were carried out for 42 hours after rhCG injection. Two weeks after rhCG injection, bhCG pregnancy test to determine pregnancy outcome in both groups was done and the outcome results, along with other information were recorded separately. The pregnancy rate in experimental group was significantly higher than that of control group. when all of the cycles with or without giving 25 mg of hyosine were stratified by the mean total follicles (more/less than 2 follicles) and embryos (more/less than25 kg/m2), the Patients’ age, the quality grade of embryos and infertility duration (more/less than 5 years), the reproductive outcome, in overall, in the subjects with more than 10 oocytes, 5 embryos, more than quality A and B grades of embryos, less than 35 years age and also less than 5 years infertility duration was more pronounced than the other patients. But the other parameter was not affected by the reproductive outcome. Clinical or statistical improvement of the reproductive outcome could be demonstrated in the hyosine treated group especially with increasing the

Performance Analysis of Ad-Hoc Routing in Clustered Multi-hop Wireless Networks
Amin Azari,Jalil Seifali Harsini,Farshad Lahouti
Computer Science , 2014,
Abstract: This paper analyzes the performance of clustered decode-and-forward multi-hop relaying (CDFMR) wireless Rayleigh fading networks, and sheds light on their design principles for energy and spectral efficiency. The focus is on a general performance analysis (over all SNR range) of heterogeneous wireless networks with possibly different numbers of relays in clusters of various separations. For clustered multi-hop relaying systems, ad-hoc routing is known as an efficient decentralized routing algorithm which selects the best relay node on a hop-by-hop basis using local channel state information. In this article, we combine ad-hoc routing and cooperative diversity in CDFMR systems, and we derive (i) a closed-form expression for the probability distribution of the end-to-end SNR at the destination node; (ii) the system symbol error rate (SER) performance for a wide class of modulation schemes; and (iii) exact analytical expressions for the system ergodic capacity, the outage probability and the achievable probability of the SNR (power) gain. We also provide simple analytical asymptotic expressions for SER and the outage probability in high SNR regime. Simulation results are provided to validate the correctness of the presented analyses.
Iranian nurses' constraint for research utilization
Mahvash Salsali, Neda Mehrdad
BMC Nursing , 2009, DOI: 10.1186/1472-6955-8-9
Abstract: Data were collected during 6 months by means of face-to face interviews follow by one focus group. Analysis was undertaken using a qualitative content analysis.Findings disclosed some key themes perceived by nurses to restrict them to use research findings: level of support require to be research active, to be research minded, the extent of nurses knowledge and skills about research and research utilization, level of educational preparation relating to using research, administration and executive challenges in clinical setting, and theory-practice gap.This study identifies constraints that require to be overcome for clinical nurses to actively get involved in research utilization. In this study nurses were generally interested to use research findings. However they felt restricted because of lack of time, lack of peer and manager support and limited knowledge and skills of the research process. This study also confirms that research utilization and the change to research nursing practice are complex issues which require both organizational and educational efforts.Seventy thousands nursing staff have been employed to provide nursing care in Iranian hospitals. Nursing is the largest healthcare profession in Iran, and they are responsible for the care they provide for their patients. If the available research is utilized properly, the nurses can be held accountable for their action in daily practice. Iranian nurses have been criticized for poor quality of patient care and informed by the healthcare system that nursing practice should be carried out based on international standards to improve the quality of patient care[1].Research utilization is a critical way to strengthen the discipline and practice of nursing.Improving research utilization will provide nurses with the 'golden opportunity' to meet the patients' caring demands with the appropriate positive responses.This research-based practice will lead to the improvement of the nursing profession.Research utilizatio
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