oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2015 ( 5 )

2014 ( 4 )

2013 ( 51 )

2012 ( 111 )

自定义范围…

匹配条件: “Mahmudi MJ” ,找到相关结果约859条。
列表显示的所有文章,均可免费获取
第1页/共859条
每页显示
The Association Between High Blood Pressure and Cognitive Impairment in Elderly: A Brief Report
Mahmudi MJ,Hedayat M,Sharifi F,Edalat B
Tehran University Medical Journal , 2012,
Abstract: Background: Epidemiological studies have reported positive, negative, U-shaped or J-shaped association between high blood pressure and cognitive function as well as dementia whereas other studies have not reported any significant association. The aim of this study was to examine the association between hypertension and cognitive impairment in the elderly residents of Kahrizak Charity Foundation (KCF). Methods: This cross sectional study was done in Kahrizak Charity Foundation in suburban areas of Tehran, Iran during 2008. The data were collected over one week. Among the 850 elderly residents of the Foundation who were ≥ 65 years old, 185 individuals were chosen randomly. The Mini-Mental State Examination (MMSE) was completed for all. Mean of all blood pressure readings were recorded while anthropometric and biochemical measurements were performed. Results: The findings indicated that in participants with cognitive impairment, systolic blood pressure, diastolic and mean blood pressures were higher than people with normal cognitive function but the differences were not significant statistically. The odds ratio of cognitive impairment in patients with and without hypertension was 1.52 and 1.58, respectively (P>0.05). Conclusion: This study did not show any significant association between hypertension and cognitive impairment in the elderly residents of Kahrizak Charity Foundation.
Performance Analysis of Compositional and Modified Black-Oil Models For a Gas Lift Process Analyse des performances de modèles black-oil pour le procédé d’extraction par injection de gaz
Mahmudi M.,Taghi Sadeghi M.
Oil & Gas Science and Technology , 2013, DOI: 10.2516/ogst/2012001
Abstract: Artificial gas lift is frequently used to boost production rate of mature oil fields. An integrated mathematical model was developed in order to track the spatial and temporal changes in various components of the continuous gas lift process. The computational demand for solving the comprehensive gas lift model highly depends on the thermodynamic treatment of the hydrocarbon fluids involved. A full compositional treatment using an equation of state provides the most accurate results but at a high computational cost. The results of this article showed that the computational cost can be halved without sacrificing accuracy by using reduced parameter stability and flash calculation procedures. It was also demonstrated that a Modified Black-Oil treatment of the fluids can provide reasonable accuracy at a much-reduced computational cost. The Modified Black-Oil treatment provides a valuable tool when the model has to be solved many hundreds of times to find the optimal combination of the gas lift parameters. Les procédés artificiels d’extraction par injection de gaz sont utilisés pour améliorer le taux de récupération des champs pétroliers matures. Un modèle mathématique intégré a été développé pour détecter de faibles changements temporels et spatiaux dans plusieurs composants des procédés continus d’extraction par injection de gaz. La solution numérique utilisée pour résoudre le modèle du procédé d’extraction dépend fortement du comportement thermodynamique des hydrocarbures impliqués. Un traitement complet de la composition utilisant une équation d’état offre les résultats les plus précis, mais à un co t de calcul très élevé. Les résultats de nos travaux de recherche montrent que l’implication des paramètres de stabilité et des procédures de calcul flash, peut diviser par deux le co t du calcul tout en gardant la précision attendue. Ces travaux montrent que la précision admissible peut être également atteinte, avec un co t minimum du calcul, par l’utilisation de modèles modifiés de type black- oil des fluides. Le modèle modifié de black-oil est un outil performant dans le cas où un nombre élevé d’itérations du modèle est nécessaire pour trouver les combinaisons optimales des paramètres du procédé d’extraction par injection de gaz.
Compositional Description of Three-Phase Flow Model in a Gas-Lifted Well with High Water-Cut Description de la composition des trois phases du modèle de flux dans un puits utilisant la poussée de gaz avec des proportions d’eau élevées
Mahmudi M.,Taghi Sadeghi M.
Oil & Gas Science and Technology , 2013, DOI: 10.2516/ogst/2012060
Abstract: Gas-lift technique is part of a long-term production sustainability solution in oil fields amid increasing water cuts and depleting reservoir energy. A three-phase compositional model describing the continuous gas-lift process for an operational oilfield experiencing high water-cut is developed. Field data with different water-cut values was considered to compare a three-phase black-oil model against its compositional counterpart. Results show that significant deviation may encounter when compositional method is employed in contrast to the black-oil model as water-cut increases. Due to different properties of the injection gas and produced gas in separators, the compositional treatment would be necessary for modeling the gas-lift process. Moreover, three-phase equilibrium calculations for hydrocarbon-water flow mixtures in the gas-lifted well with moderate and high water-cut are required. La technique par poussée de gaz dite gas-lift fait partie des solutions durables de production à long terme des champs pétroliers. Pour un champ pétrolier en opération affecté par des proportions d’eau élevées, un modèle de composition en trois phases, décrivant le procédé continu de gas-lift, a été développé. Les données du champ pétrolier pour différentes proportions d’eau ont été évaluées pour pouvoir comparer le modèle black-oil en trois phases avec un modèle compositionnel. Lorsque les proportions d’eau augmentent, les résultats montrent qu’une déviation conséquente peut avoir lieu lorsque la méthode compositionnelle est utilisée en comparaison avec le modèle black-oil. En raison des différentes propriétés du gaz d’injection et du gaz produit dans les séparateurs, le traitement compositionnel serait a priori nécessaire pour modéliser le procédé de gas-lift. De plus, les calculs portant sur un équilibre en trois phases pour les mélanges d’hydrocarbures et d’eau dans le gas-lift du puits, sont nécessaires pour des proportions d’eau modérées et élevées.
Biotransformation of Aromatic Aldehydes by Cell Cultures of Peganum harmala L. and Silybum marianum (L.) Gaertn
Gholamreza Asghari,Gholamali Saidfar,Shohreh Mahmudi
Iranian Journal of Pharmaceutical Research , 2004,
Abstract: Many aldehydes are important components of natural flavours. They are used in food, cosmetic, and biomedical industries in large amounts. Plant cells or microorganisms carry out their production by biotransformation, which is one of the biotechnological methods that allow them to be defined as 'natural'. Cell cultures of Silybum marianum and Peganum harmala have been studied with a view to investigat their abilities to produce flavonolignans and -carboline alkaloids respectively. However, we have isolated S. marianum and P. harmala culture strain, which are able to metabolise several aromatic aldehydes. Ten culture strains derived from S. marianum and P.harmala were examined for their ability to biotransform exogenous aromatic aldehyde compounds, including benzaldehyde, 2- methoxybenzaldehyde, 4-methoxybenzaldehyde, cinnamaldehyde and 3-methoxy, 4-hydroxy benzaldehyde. Callus cultures of Silybum marianum and Peganum harmala were established from seedlings, and healthy suspensions were grown using the Murashige and Skoog medium. Exogenous aromatic aldehydes were fed to S. marianum and P. harmala cell suspension cultures. Biotransformation reactions were detected over 24 h of incubation. The cultures then extracted with dichloromethane and extracts subjected to GC and GC-MS analysis. The S. marianum cultured cells in this study exhibit greater selectivity in the reduction of aromatic aldehydes than P. harmala culturedcells. The ability of cultured plant cells to biotransform substrate appears to be dependent on the culture strains as well as the nature and position of the substituent on the aromatic ring.
Neutrophil 'connectivity': key to neutrophil-mediated tissue injury?
Salahaddin Mahmudi-Azer, Stephan F van Eeden
Critical Care , 2003, DOI: 10.1186/cc1884
Abstract: Neutrophils are professional phagocytic cells that provide the host with a first line of defense against acute bacterial and fungal diseases. They sense the focus of infection, they adhere to the endothelium of capillaries and venules adjacent to the inflammatory locus, they migrate through the vessel wall and the interstitial tissues to the infectious site and they phagocytose, kill and digest the invading microorganisms using a large number of proinflammatory mediators and proteolytic enzymes. During the inflammatory process, neutrophils produce factors to ensure their survival in the hostile inflammatory milieu, they recruit additional phagocytes, they inactivate their own toxic products and they induce their own death pathway to prevent damage to normal host tissue. Neutrophils may damage normal tissue, and a number of clinical conditions such as acute respiratory distress syndrome, septicemia with multiorgan failure, ischemia reperfusion injury and rheumatoid arthritis have all been linked to inappropriate neutrophil-mediated tissue damage.In the present issue of Critical Care, Seely and colleagues delineate the important association of neutrophil cell membrane molecules with specific neutrophil function [1]. They argue that neutrophil membrane molecules mediate the processes integral to neutrophil delivery, function and clearance. These surface molecules connect neutrophils to their external environment (connectivity), and alterations in these molecules reflect changes in cell function and behavior during every stage of the neutrophil's lifespan. Cell surface molecules alter with neutrophil proliferation, differentiation, maturation and the release of cells from the marrow into the circulation. Surface adhesion molecules and chemoattractant receptors are pivotal in determining tissue localization and recruitment of neutrophils, and when in the tissues, cell surface receptors are critical in cell activation and recognition of foreign pathogens. Surface molecule
Early Exploration in the Management of Acute Scrotum in Children
Ahmad Khaleghnejad Tabari,Alireza Mirshermirani,Mohsen Rouzrokh,Morteza Mahmudi
Iranian Journal of Pediatrics , 2010,
Abstract: Objective:Acute scrotal conditions are a common clinical setting that present with pain and swelling of the hemiscrotum. The aim of our study has been to evaluate the findings in boys operated on acute scrotum. Methods:A descriptive study was conducted on 100 patients with acute scrotum admitted to Mofid Childrens Hospital from March 1993 to March 2007. Data included history, age, primary symptoms, definite diagnosis, side involvement, paraclinical tests, imaging modalities, medical or surgical management and type of the surgery. Findings:Diagnosis was made mainly by clinical signs and symptoms and surgical exploration. Torsion of testis (n=31) was the most common cause of acute scrotum followed by incarcerated inguinal hernia (n=30), torsion of testicular appendage (n=27), epididymo-orchitis (n=7), idiopathic scrotal edema (n=4) and hematocele (n=1). Most (34%) of the patients were in the first year of life and the mean age was 5.4 years. The commonest signs were pain and swelling (62%) followed by pain, swelling and redness (21%) and pain alone (16%). 83 patients consisting of 31 with torsion of testis, 14 with torsion of testicular appendage, 30 with incarcerated hernia and 7 with epididymo-orchitis underwent surgical exploration after careful physical examination. 10 of 31 patients with torsion of testis had orchiectomy and orchiopexy of contra-lateral testis and the rest had detorsion and bilateral orchiopexy. 80% of patients were referred to the hospital after 12 hours of clinical onset of symptoms. Conclusion:Early exploration of scrotum based on careful physical examination excludes the risk of misdiagnosis by diagnostic procedures and unnecessary delay by diagnostic techniques. Exploration of scrotum is a relatively safe and simple procedure with good cosmetic results, it also allows an accurate diagnosis to be made.
Effects of the syntactic complexity on the amount of speech dysfluency of stuttering and nonstuttering Persian-speaker children in conversational speech
Fateme Haresabadi,Sheyda Pooladi,Behruz Mahmudi Bakhtiyari,Mohammad Kamali
Koomesh , 2010,
Abstract: Introduction: Many researches have dealt with the relationship between stuttering and differentlinguistic factors. This study investigates the effect of syntactic complexity on the amount of speechdysfluency in stuttering Persian-speaking children, and comparing them with the non-stuttering ones. Theobtained results can pave the way to obtain a better knowledge of the nature of stuttering, as well asfinding more suitable ways in the process of its treatment.Materials and Methods: The participants were 10 stuttering and 10 non-stuttering Persian-speakingand monolingual children in the age range of 4-6 which were matched by age and gender. First 30minutes sample of child's spontaneous speech was provided and then utterances of each child studied forthe amount of dysfluency and syntactic complexity.Results: In both groups of stuttering and non-stuttering children, there was a significant difference forthe amount of dysfluency between simple and complex sentences.Conclusion: The results of this study show that by increase of syntactic complexity at the spontaneousspeech level, stuttering and non-stuttering children had more dysfluency amount. Also, by increase ofsyntactic complexity, stuttering children had more dysfluency amount than non-stuttering children.
Efficacy of continuing medical education on knowledge of general practitioners
Hamid Mohamad jafari,Korosh Vahidshahi,Mitra Mahmudi,Ali Abbaskhanian
Koomesh , 2008,
Abstract: Introduction: Continuing medical education (CME) is a necessary way to keep graduatedphysicians knowledge and practice up-to-date, thus, play an important role in improving health care.Several years after implementing these programs in the country of Iran, it is necessary evaluate theefficacy of these programs. The aim of this study was to evaluate knowledge of participants in CMEprogram before and after of CME programs.Materials and Methods: All general practitioners (GPs) who were participated in CME programsof the Mazandaran University of Medical Sciences (Sari, Iran) in the spring of 2006 entered in thestudy. A self directed and multi choice questionnaire was designed to seek demographic characteristicsand knowledge of them about titles by programs. Its reliability was evaluated by internal consistencyand validity by attending. The questionnaires were distributed before and after of each program. Datawas analyses by SPSS and paired T- test.Results: From 300 participates, 235 persons were completed the questioner (q) (responserate=78%). The mean points of ENT q before and after program was 9.15±1.95 and 9.75±1.61,respectively (total point 20). In addition , these mean points were 9.85 ±2.29 and 10.22 ±1.79 (total18) for general surgery, 11.79±2.65 and 14.12±3.38 (total 23) for psychiatry, 6.48±2.55 and 8.52±3.3(total 19) for ophthalmology, 5.83±2.39 and 9.07±2.53 (total 17) for urology, and 7.79±2.11 and10.68±2.54 (total 24)for dermatology.Conclusion: The mean scores of knowledge of GPs were low and CME programs could notimprove it, therefore, it is necessary to re-evaluate the contents and methods of CME programs forimproving knowledge of general practitioners.
Quality of Life in Schizophrenic Patients
Naema Khodadadi,Mojgan Baghaie,Haeideh Mahmudi,Farzaneh Sheikholeslami
Zahedan Journal of Research in Medical Sciences , 2012,
Abstract: Background: Nowadays, quality of life (QoL) is an important indicator of treatment outcome and it's evaluation in schizophrenic patients will be vital. So, this study is conducted to compare QoL in schizophrenic patients and healthy people in Rasht, Guilan.Materials and Method: This study is a cross-sectional descriptive survey that was done on 52 patients with schizophrenia referred to Shafa hospital with convenience sampling method and 153 healthy people of Rasht by cluster method. Data collection instrument was a 3 part questionnaire consisting demographic-social questionnaire, WHO QoL questionnaire, and mental status assessment form. Data gathered by interview and analyzed with SPSS software using descriptive and inferential statistics (χ2, ANOVA, independent-t test). Results: Our finding indicated that patients and healthy individuals QoL had overall statistically significant difference (p<0.0001), and it's general (p<0.006), physical (p<0.0001), psychiatric (p<0.001), and social relationship (p<0.015). Conclusion: According result, schizophrenic clients compare with healthy people had lower QoL level that need special attention to improve treatment and their post-discharge care with focus on social relationship in this group of patients.
Acute Rheumatic Fever in the North East of Iran: A Study of 80 Cases
Eftekhar Mahmudi,Farah Ashrafzadeh,Saeed Talebi,Fatemeh Ghaneh
Journal of Tehran University Heart Center , 2006,
Abstract: Background: To evaluate the frequency, clinical presentation and cardiac involvement of children with RF in the North-East of Iran. Methods: A case series analysis was conducted on 80 patients with acute rheumatic fever (ARF), who were hospitalized at Ghaem hospital in Mashad between 1994 and 2000, were studied. Laboratory tests and results from echocardiographic examinations, and clinical findings were analyzed. All patients received standard care for children with ARF. The X2 test was used for comparison of binary data. Results: When compared to similar studies from developed countries, our study demonstrates a decreased frequency of RF in North-East Iran over the past few years. However, it is still a major health problem and the most common cause of acquired heart disease in childhood. The distribution of the major modified Jones criteria in our study is slightly different from that described in the literature, with a higher incidence of carditis. Conclusion: It appears that carditis is endemic in this region. Considering the high morbidity and complications involved in this disease, there is an immediate need for effective preventive programs for the initiating cause streptococcal infections, especially since it is treatable.
第1页/共859条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.