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Effectiveness of revascularization of the ulcerated foot in diabetic patients with peripheral artery disease for one year follow-up

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Frontiers in Biology 2018年第6期13卷 458-463页

作者： Mohammad Momen Gharibvand Mina Mounesi Arman Shahriari Asghar Sharif najafi Azim Motamed far Atefeh Roumi Department of Radiology school ofmedicineAhvaz Jundishapur University of Medical SciencesAhvazIran Department of Internal Medicin School of MedicineAhvaz Jundishapur University of Medical SciencesRazi HospitalAhvazIran

Diabetes is an important risk factor for atherosclerosis. The diabetic foot is characterized by the presence of arteriopathy and neuropathy. When ischemia is diagnosed, restoration of pulsatile blood flow by revascularization may be considered for salvaging the limb. The treatment options are angioplasty with or without stenting and surgical bypass or hybrid procedures combining the two. To evaluate the outcomes of severe ischemic diabetic foot ulcers for which percutaneous transluminal angioplasty (PTA) was considered as the first-line vascular procedure. Factors associated with successful PTA were also evaluated. In 80 consecutive diabetic patients with foot ulcers and severe limb ischemia, PTAwas performed if feasible. All patients were followed until healing or for one year. Clinical and angiographic factors in fluencing outcomes after PTA were sought by univariate and multivariate analysis. PTAwas done in 73 of the 80 (91.2%) patients, and considered clinically succe ssful in 58(79.9%). Successful PTA was significantly higher in patients with Superficial femoral artery, posterior Tibialis and dorsalis pedis arteries involvement in the univariate analysis. Seven patients were expired during the study follow up due to MI, pulmonary thromboembolism and GI bleeding. PTA in diabetic patients with severe ischemic foot ulcers provided favorable. Some parameters could be used for predicting PTA successfulness.

关键词： percutaneous transluminal angioplasty revascularization diabetes

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New tetrazole-based organic dyes for dye-sensitized solar cells

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Journal of Energy Chemistry 2015年第6期24卷 770-778页

作者： Zahra Jafari Chermahini Alireza najafi Chermahini Hossein A Dabbagh Abbas Teimouri Department of Chemistry Isfahan University of Technology Chemistry Department Payame Noor University (PNU)

A series of new metal-free organic dyes that contain donors with triphenylamine or its derivatives and tetrazole-based acceptors were synthesized and characterized by photophysical, electrochemical, and the- oretical computational methods. They were applied in nanocrystalline TiO2 solar cells （DSSCs）. It is found that the introduction of diphenylamine units as antennas in the as-synthesized dyes could improve photo- voltaic performance compared with phenothiazine and carbazole units as antennas in DSSCs. The dye with （2H-tetrazol-5-yl） acrylonitrile electron acceptor also displayed the highest solar-to-electrical energy conver- sion efficiency.

关键词： Tetrazole Dye sensitized solar cells DFT Synthesis Anchoring group

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Microstructures, hardening and tribological behaviors of tin matrix composites reinforced with SiC and Zn particles

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Rare Metals 2021年第9期40卷 2584-2592页

作者： Fatemeh Ghasemi Mohammad Moazami-Goudarzi Hamidreza Najaﬁ Department of Materials Engineering Science and Research BranchIslamic Azad UniversityTehran ***Iran

In order to strengthen pure tin and improve its dry sliding resistance, Sn/SiC and Sn/Zn composites were fabricated via a powder metallurgy route. Microstructure,hardness and pin-on-disk wear resistance of pure tin and the fabricated composites were compared to those of Sn–7.5 Sb–3.5 Cu Babbitt alloy. The dominant wear mechanism at different applied loads was determined by analyzing worn surfaces and wear debris in each case. The results showed that the hardening effect of Zn was much higher than that of SiC. The hardening role of Zn in the tin matrix was ascribed to the direct load transfer mechanism. Microscopic studies of the worn surfaces revealed that the pure tin was susceptible to surface fatigue wear and plowing damage, depending on the normal load applied during the wear test. In the case of Sn/SiC composite and the Babbitt alloy, delamination wear mechanism resulting from subsurface crack propagation controlled the wear rate. While the highest hardness and the lowest coefficient of friction were obtained for the Babbitt alloy, the Sn/Zn composite exhibited the highest wear resistance at a constant applied load, indicating the importance of asperity contact type in the wear process.

关键词： Tin matrix composites Babbitt alloy Microstructure Hardening mechanisms Wear behavior

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Interfacial microstructure and mechanical properties of tungsten carbide brazed joints using Ag-Cu-Zn + Ni/Mn filler alloy

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Transactions of Nonferrous Metals Society of China 2017年第12期27卷 2638-2646页

作者： Mahyar HASANABADI Ali SHAMSIPUR Hasan najafi SANI Hamid OMIDVAR Sima SAKHAEI Department of Mining and Metallurgical Engineering Amirkabir University of Technology Tehran 15875-4413 Iran

WC-Co hard metal was furnace brazed by Ag-Cu-Zn+Ni/Mn filler alloy using a tube furnace under high-purity argon at730°*** influence of brazing time and gap size of joints was *** results revealed the maximum shear strength of(156±7)MPa for samples with150μm gap size at a holding *** characterization and microstructure of the brazed joints were characterized by SEM,EDS and *** results showed that increasing the time from5to15min could provide a better chance for the liquid interlayer to flow towards the base ***,the formation of some metallic phases such as Mn3W3C at brazing time longer than15min resulted in decreased shear strength of the joint.

关键词： brazing tungsten carbide Ag alloy filler alloy microstructure wetting properties shear strength

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The spatial and temporal relationship between oxidative stress and neuronal degeneration in 3-nitropropionic acid model

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World Journal of Neuroscience 2012年第4期2卷 234-247页

作者： Thierry Delorme Mohammad najafi Payman Nasr Department of Biological Sciences Kent State University Ashtabula USA

The current study investigates the role of oxidative stress and calcium homeostasis in the development of selective striatal lesions in metabolic impairment model caused by 3-nitropropionic acid (3NP). In this report, we examined the distribution of oxidative stress markers and the production of mitochondrial reactive oxygen species in the presence of 3NP in male Sprague-Dawley rats. Protein oxidation was assessed using 3-nitrotyrosine immunoreactivity, while DNA oxidative damage was evaluated by poly (ADP-ribose) polymerase-1 activity. The Reactive Oxygen Species (ROS) production was determined in isolated mitochondrial from striatum and cerebellum of two age groups following 3NP and variable calcium concentration. The results demonstrate that increased 3-nitro-tyrosine level is the most robust in the striatum and the least evident in the cerebellum following 4 days of 3NP treatment. No significant change in the levels of poly ADP-ribosylated proteins was observed, likely due to a rapid PARP-1 cleavage as detected by the appearance of 50 kDa necrotic fragment. In mitochondrial isolates, there was no immediate increase in mitochondrial ROS following 3NP in either striatum or cerebellum;however, calcium addition resulted in a concentration dependent increase in reactive oxygen species in striatal mitochondria of the older animals. These results suggest that in aging, mitochondria become more susceptible to the generation of ROS in conditions that cause a concurrent compromised in mitochondrial calcium concentration. This finding implicates mitochondria dysfunction as a key cellular target in pathological states that are associated with metabolic impairment. The results also reinforce the notion that mitochondrial function in the striatum and cerebellum respond differently to the aging process, which may explain the variable regional vulnerability in 3NP model.

关键词： Energy Impairment 3-Nitropropionic Acid Oxidative Stress Neurodegeneration

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Vigilance in Nurses Working in Intensive Care Units

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Open Journal of Nursing 2021年第9期11卷 715-727页

作者： Mehdi Ajri-Khameslou Mojgan najafi Mansoureh Karimollahi Nursing Department School of Nursing and Midwifery Ardabil University of Medical Sciences Ardabil Iran

Background and Aim: Vigilance is an essential element in intensive care nursing. This study was conducted to determine nursing vigilance in nurses working in the intensive care units of educational and medical centers in Ardabil, Iran. Methods: This was a cross-sectional descriptive-analytical study with 192 ICU nurses as the participants. The data were obtained through questionnaires regarding demographic characteristics and nursing vigilance. SPSS software version 24 was used for the statistical analysis. Results: The mean total vigilance score was 3.86 ± 0.23 of 5. The mean scores of the timely diagnosis of changes, pattern recognition, and clinical decision-making subscales were 4.07 ± 0.26, 04.04 ± 0.41, and 3.44 ± 0.25, respectively. No significant relationships were observed between the total or subscale vigilance scores and other demographic characteristics. Conclusion: We assessed ICU nurses’ vigilance behaviors and found that their mean vigilance score was higher than the expected average, indicating our participants had a high level of clinical vigilance. These results suggest a need for effective educational interventions to boost clinical decision-making skills in ICU nurses, especially younger nurses.

关键词： Nursing Vigilance Intensive Care Unit Nurse Clinical Decision-Making

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A Study of the Link Between the Tourism Industry and the GDP in the ECO Countries

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Sociology Study 2012年第5期2卷 330-336页

作者： Ahmad Assadzadeh Hossein Panahia Mir Hojjat najafi University of Tabriz Iran Tabriz Business Training Centre lran

The present study aims at exploring the causal relationship between tourism industry and GDP in the economic cooperation organization （ECO） countries for the period of 2000-2010. To this end, the causal relationship between the two variables was examined using panel data and Granger standard causality test. The results demonstrate a unidirectional causality from GDP to the number of tourists coming to the ECO countries, it is also concluded that a rise in the country＇s GDP provides necessary conditions for investment on all sectors of the economy including the tourism sector. In such conditions, if the country＇s economic priorities comprise tourism development, then tourists will start visiting the country and the industry will flourish. Thus, policy-makers should focus on the increasing GDP if they want to increase the tourists＇ influx.

关键词： Tourism industry economic cooperation organization (ECO) countries panel data analysis

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The Time Series Spectral Analysis of Satellite Altimetry and Coastal Tide Gauges and Tide Modeling in the Coast of Caspian Sea

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Open Journal of Marine Science 2016年第2期6卷 258-269页

作者： Mahmoud Pirooznia Sayyed Rouhollah Emadi Mehdi najafi Alamdari Islamic Azad University North Tehran Branch Tehran Iran Islamic Azad University South Tehran Branch Tehran Iran

This study endeavors to deal with the least square spectral analysis on the time series, to find present significant frequencies, to analyze 40 tide components using harmonic methods and to show relationship between discovered frequencies and 40 components of tide. For the purpose of collecting data of altimetry satellites of Topex/Poseidon (T/P), Jason 1, Jason 2 and coastal tide gauges of Bandar Anzali, Noshahr, and Nekah were utilized. In this time series formed by cross over points of altimetry satellite and then using least square spectral analysis on time series derived from altimetry satellite and coastal tide gauges the significant components were found and annual, biannual, and monthly components were discovered. Then, analysis of 40 tide components was conducted using harmonic method to find the amplitude and phase. It represented that solar annual (Sa) plays the most significant role on Caspian Sea corresponded to the least square spectral analysis of the time series. The results shows that the annual (Sa) and semi-annual Solar (Ssa) constituents on all of the ports listed have the highest amplitude in comparison with the other constituents which are respectively 16 cm, 18 cm and 15 cm for annual constituent and 2.8 cm, 5.4 cm and 3.7 cm for semi-annual constituent.

关键词： Least Square Spectral Analysis Harmonic Analysis Altimetry Satellite Coastal Tide Gauges

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Effect of oral garlic on arterial oxygen pressure in children with hepatopulmonary syndrome

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World Journal of Gastroenterology 2006年第15期12卷 2427-2431页

作者： Mehri najafi Sani Hamid Reza Kianifar Abdolrazagh Kianee Gholamreza Khatami Division of pediatric Gastroenterology Department of Pediatrics Children's Medical Center Hospital of Tehran UniversityTehranIran Division of Pediatric Gastroenterology Department of Pediatrics Ghaem Medical Center of Mashhad University of Medical SciencesMashhadIran Division of Pediatric Cardiology Department of Pediatrics Children's Medical Center Hospital of Tehran UniversityTehranIran

AIM： To study the effect of oral garlic on arterial oxygen pressure in children with hepatopulmonary syndrome, METHODS： Garlic powder in a capsule form was given to 15 children with hepatopulmonary syndrome （confirmed by contrast echocardiography） at the dosage of 1 g/1.73 m^2 per day. Patients were evaluated clinically and by arterial blood gas every four weeks. RESULTS： The garlic capsule was administered to 15 patients with hepatopulmonary syndrome. There were 10 boys and 5 girls with a mean age of 9.4 ± 3.9 years. The underlying problems were biliary tract atresia （4 patients）, autoimmune hepatitis （4 patients）, cryptogenic cirrhosis （4 patients） and presinusoidal portal hypertension （3 patients）. Eight patients （53.3%） showed an increase of 10 mmHg in their mean arterial oxygen pressure. The baseline PaO2 was 65.6 ± 12.1 mmHg in the responder group and 47.1 ± 11.2 mmHg in nonresponder group. At the end of treatment the mean PaO2 in responders and non-responders was 92.2 ± 7.75 mmHg and 47.5 ± 11.87 mmHg, respectively （P 〈 0.01）. CONCLUSION： Garlic may increase oxygenation and improve dyspnea in children with hepatopulmonary syndrome.

关键词： Hepatopulmonary syndrome Garlic Arterial oxygen pressure Pediatric

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Nutlet Micromorphological Study on <i>Salvia</i>L. (Lamiaceae) from NE Iran

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American Journal of Plant Sciences 2013年第7期4卷 1457-1460页

作者： Seyed Mohammad Mousavi Azarnoosh Jafari Shahla najafi Department of Biology Faculty of sciences Mashhad Branch Islamic Azad University Mashhad Iran Department of Biology Faculty of Sciences University of Zabol Zabol Iran.

In the present research, micromorphological features of 10 Salvia L. nutlets (mericarp) growing in NE Iran were studied by SEM. These species were divided into three and four groups based on the shape and ornamentatio... 详细信息

关键词： Salvia Iran Nutlet Mericarp Micromorphological Features

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