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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: crystal structure,Electrochemistry,Cu(I) complexes,Diene,Electrocatalyst
- چکیده:
- چکیده انگلیسی: The mononuclear complex [Cu(L)(CH3CN)(PPh3)]ClO4, (1), (L= 2,5-diphenyl-3,4-bis(2-pyridyl)cyclopenta-2,4-dien-1-one), has been synthesized and investigated by elemental analysis, IR, 1H NMR, UV-Vis spectroscopic methods and X-ray diffraction. The complex crystallizes in the non-centrosymmetric space group P212121 in accord with the asymmetric (atropisomer) Cu centre. Its coordination polyhedron has four vertices and is devoid of any symmetry. The [Cu(L)(CH3CN)(PPh3)]ClO4 is amongst the few MeL complexes crystallizing in a non-centrosymmetric space group. The bite-angle of the bidentate ligand L is 90.92(13)°, indicating some strain in the structure; this entails an enhanced instability of the complex with respect to strongly coordinating solvents. The crystal of 1 owes its cohesion to a multitude of weak C-H...O and C-H... interations. The electrochemistry of the complex shows three reversible ligand-centred reduction processes and an irreversible metal-centred one. This indicates that the coordination of the CuI(CH3CN)(PPh3) moiety to the L leads to the delocalization of electron density from L to the CuI(CH3CN)(PPh3) moiety.
- انتشار مقاله: 31-01-1394
- نویسندگان: Ahmad Amiri,Mohammad Reza Binaeizadeh,Farzaneh Fadaei,Kurt Schenk-Joß
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: crystal structure,Cyclic Voltammetry,Substituted bispyridylamide,Cobalt(III) complex
- چکیده:
- چکیده انگلیسی: An octahedral cobalt(III) complex, trans-[(Me2bpb)Co(bzlan)2]ClO4 (1), with H2Me2bpb = N,N’-(4,5-dimethyl-1,2-phenylene)dipicolinamide and bzlan = benzylamine, has been synthesized and characterized by elemental analyses, IR, UV-Vis, and 1H NMR spectroscopy. The structure of this complex has been determined by X-ray crystallography. The Me2bpb2– is a di-anionic tetradentate ligand furnishing a N4 set, such that two N atoms of the two pyridine rings and two amido N atoms occupy four equatorial positions. The two benzylamine ligands occupy the two axial positions leading to a distorted octahedral geometry around the central cobalt ion. The electrochemical behavior of this complex in acetonitrile solution indicates that the irreversible oxidation of 4,5-dimethylorthophenylene moiety and reduction of pyridine rings of the free ligand appear as reversible waves in the cyclic voltammogram of its cobalt(III) complex. Concomitant CoIII/CoII redox process and solvolysis in acetonitrile solution is observed. This irreversible redox process becomes reversible in the presence of excess benzylamine.
- انتشار مقاله: 11-09-1393
- نویسندگان: Soraia Meghdadi,Kurt Mereiter,Narges Shams Mohammadi,Ahmad Amiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Physical Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Kinetics,Acetylene,Ethynyl radical,RRKM,VRC-TST
- چکیده:
- چکیده انگلیسی: In this theoretical research, the mechanism of the C2H + C2H2 reaction is studied by high-level quantum-chemical methods and kinetics of the reaction is investigated by statistical rate theories. High-level electronic structure calculation methods including M06-2X, CCSD(T), CBS-Q and G4 methods are employed to explore the doublet potential energy surface of the reaction and compute the molecular properties necessary for carrying out the statistical rate theory calculations. After locating stationary points of the reaction, steady-state approximation to the chemically-activated intermediates along with some statistical manipulations are applied to derive some practical integral equations for the rate constants of formation of all possible products of the reaction. Unimolecular rate constants are computed by RRKM theory. VRC-TST is used to compute the sum of quantum states for internal degrees of freedom of loose transition states. The present calculations reveal that the product HCCCCH + H (P8) is the dominant product over whole pressure and temperature range considered in the present study. Nonetheless, at low temperatures and high pressures, other intermediate products especially HCC(H)CCH and H2CCCCH, become significant. The overall computed rate constants are nearly constant over the temperature range 100-500 K and slightly increase at higher temperatures.
- انتشار مقاله: 30-04-1396
- نویسندگان: Vahid Saheb,Ahmad Amiri,Mohammad Reza Noorbala
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Water and Environmental Nanotechnology
- نوع مقاله: Journal Article
- کلمات کلیدی: adsorbent,Thiol- mesoporous silica,Pb (II) ions
- چکیده:
- چکیده انگلیسی: In this study, thiol-functionalized nanostructure silica type MCM-41 was successfully prepared via the facile one-pot hydrothermal method with low amounts of the directing agent. The mesoporous silica indicated a remarkable adsorption behavior toward Pb(II) ions without any interference of the competing ions. The main experimental variables affecting removal efficiency of the adsorbent were examined, and the optimized conditions were achieved as to be 6, 50 mg, and 30 min for solution pH, the adsorbent dosage, and contact time, respectively. The adsorbent was triumphantly used for the removal of Pb (II) ion from real water samples with a notable removal efficiency as 95%. The concentrations of the competitive ions in the solution were about 10 to 100 times more than Pb (II) ions. The results show that other ions had no interfering effect on the removal efficiency of Pb (II) ions. It means that SH-SiO2 has excellent selectivity for Pb (II) ions and is an appropriate candidate for removing Pb (II) ions from the real samples.
- انتشار مقاله: 10-04-1399
- نویسندگان: Najmeh Atoub,Ahmad Amiri,Alireza Badiei,Jahan B. Ghasemi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Risk Factor,premature neonate,Retinopathy of prematurity,Low birth weight
- چکیده:
- چکیده انگلیسی: Background & Aims: Retinopathy OF prematurity (ROP) is a developmental disorder of retinal vessels in premature neonates. In recent years, because of advances in the care of neonates hospitalized in equipped Intensive care units, retinopathy of prematurity has become a major cause of blindness in those who are survived. This study assessed the incidence and severity of retinopathy and related risk factors in premature infants in Bo-Alisina and Emam Khomeini Hospitals in Sari. Methods: This was a descriptive cross-sectional study conducted for one year. All neonates hospitalized in NICU and neonatal wards of selected Hospitals with a gestational age less than 30 weeks or gestational age less than 34 weeks with unstable conditions were included for clinical and laboratory studies. Result: The incidence of ROP in 146 studied neonates was 16.4% (24 cases), of which 6 cases were of grade 1, 14 cases of grade 2 and four cases were grade 3. All four cases with grade 3 ROP were recovered with injection of intravitreal avastin or without medical therapy. Sixty six percent of patients with ROP, had a gestational age of less than 30 weeks and all of them had birth weights less than 2000grams. There was statistical correlation between the incidence of ROP and gestational age, birth weight, history of intubation, Intraventricular hemorrhage, PH <7.2, history of high or low blood pressure and fraction of inspired oxygen in newborns. But, no significant relationship was found between duration of oxygen therapy, history of sleep apnea, Resuscitation, sepsis and duration of Phototherapy with ROP. Conclusions: The incidence of retinopathy of prematurity in Bo-Alisina and Emam Khomeini Hospitals in Sari was similar to other studies. The most important risk factors were low gestational age and birth weight. Considering the risk of the disease in premature infants, ROP screening is recommended not only for prematures under 30 weeks of gestational age but also in more mature ones who have any risk factor for ROP.
- انتشار مقاله: 22-04-1395
- نویسندگان: Maryam Nakhshab,Ahmad Ahmadzadeh Amiri,Sharareh Dargahi,Roya Farhadi,Jamshid Yazdani
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Vaccines,Breast Neoplasms,Computer Simulation,PRAME antigen
- چکیده:
- چکیده انگلیسی: Background: The most prevalent cancer in women over the world is breast cancer. Immunotherapy is a promising method to effectively treat cancer patients. Among various immunotherapy methods, tumor antigens stimulate the immune system to eradicate cancer cells. Preferentially expressed antigen in melanoma (PRAME) is mainly overexpressed in breast cancer cells, and has no expression in normal tissues. FliCΔD2D3, as truncated flagellin (FliC), is an effective toll-like receptor 5 (TLR5) agonist with lower inflammatory responses. The objective of the present study was to utilize bioinformatics methods to design a chimeric protein against breast cancer.
Methods: The physicochemical properties, solubility, and secondary structures of PRAME+FliCΔD2D3 were predicted using the tools ProtParam, Protein-sol, and GOR IV, respectively. The 3D structure of the chimeric protein was built using I-TASSER and refined with GalaxyRefine, RAMPAGE, and PROCHECK. ANTIGENpro and VaxiJen were used to evaluate protein antigenicity, and allergenicity was checked using AlgPred and Allergen FP. Major histocompatibility complex
)MHC( and cytotoxic T-lymphocytes )CTL( binding peptides were predicted using HLApred and CTLpred. Finally, B-cell continuous and discontinuous epitopes were predicted using ABCpred and ElliPro, respectively.
Results: The stability and solubility of PRAME+FliCΔD2D3 were analyzed, and its secondary and tertiary structures were predicted. The results showed that the derived peptides could bind to MHCs and CTLs. The designed chimeric protein possessed both linear and conformational epitopes with a high binding affinity to B-cell epitopes.
Conclusion: PRAME+FliCΔD2D3 is a stable and soluble chimeric protein that can stimulate humoral and cellular immunity. The obtained results can be utilized for the development of an experimental vaccine against breast cancer.- انتشار مقاله: 10-04-1398
- نویسندگان: Mortaza Taheri-Anganeh,Amir Savardashtaki,Asma Vafadar,Ahmad Movahedpour,Zahra Shabaninejad,Amir Maleksabet,Ahmad Amiri,Younes Ghasemi,Cambyz Irajie
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: risk factors,Health Indicators,EMRO,Child Mortality
- چکیده:
- چکیده انگلیسی: Introduction
All nations are striving for development. Economic development is one of the main parts of development process, but not all of it. Populations health is one of the main factors of economic development, and child’s mortality is one of the main factors of population health status. The aim of this study is investigating the role of socioeconomic disparties in under 5 mortality in Eastern Mediterranean Regional Office (EMRO) countries.
Materials and Methods
This study is a restropective and panel data type. Data used in this study inquired form the World Health Organization(WHO) and the World Bank database for 20 EMRO countries. In order to investigate socio-economic factors of under 5 mortality we used per capita income logarithm, health expenditure per capita, out-of-pocket health expenditure, access to improved sanitation and Measles vacination, literacy rate in 15 to 24 years old females, female unemployment rate, and birth rate.
Results
According to results, all variables (Per Capita National Income, Health Expenditure Per Capita, Access to Health Facilities, Out-of-Pocket Health Expenditure, and Measles Immunization, Female Literacy Rate for 15 to 24 year old, Female Unemployment Rate and Crude Birth Rate) showed significant relationship with under 5 mortality except per capita health expenditure. Per capita income logarithm also had the greatest impact in reducing the mortality of children under 5 year in comparison with other variables.
Conclusion
Childs mortality is the symbol of development and have important role in population growth. Results of this study indicate that access to healthcare services have lower impact on childs mortality rather than economic variables.- انتشار مقاله: 24-08-1394
- نویسندگان: Masoumeh Moezzi,Ahmadreza Amiri Ebrahimmohamadi,Laleh Rashidi,Reza Shirani Faradonbeh
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: crystal structure,Electrochemistry,Cu(I) complexes,Diene,Electrocatalyst
- چکیده:
- چکیده انگلیسی: The mononuclear complex [Cu(L)(CH3CN)(PPh3)]ClO4, (1), (L= 2,5-diphenyl-3,4-bis(2-pyridyl)cyclopenta-2,4-dien-1-one), has been synthesized and investigated by elemental analysis, IR, 1H NMR, UV-Vis spectroscopic methods and X-ray diffraction. The complex crystallizes in the non-centrosymmetric space group P212121 in accord with the asymmetric (atropisomer) Cu centre. Its coordination polyhedron has four vertices and is devoid of any symmetry. The [Cu(L)(CH3CN)(PPh3)]ClO4 is amongst the few MeL complexes crystallizing in a non-centrosymmetric space group. The bite-angle of the bidentate ligand L is 90.92(13)°, indicating some strain in the structure; this entails an enhanced instability of the complex with respect to strongly coordinating solvents. The crystal of 1 owes its cohesion to a multitude of weak C-H...O and C-H... interations. The electrochemistry of the complex shows three reversible ligand-centred reduction processes and an irreversible metal-centred one. This indicates that the coordination of the CuI(CH3CN)(PPh3) moiety to the L leads to the delocalization of electron density from L to the CuI(CH3CN)(PPh3) moiety.
- انتشار مقاله: 31-01-1394
- نویسندگان: Ahmad Amiri,Mohammad Reza Binaeizadeh,Farzaneh Fadaei,Kurt Schenk-Joß
- مشاهده
- جایگاه : پژوهشی
- مجله: Inorganic Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: crystal structure,Cyclic Voltammetry,Substituted bispyridylamide,Cobalt(III) complex
- چکیده:
- چکیده انگلیسی: An octahedral cobalt(III) complex, trans-[(Me2bpb)Co(bzlan)2]ClO4 (1), with H2Me2bpb = N,N’-(4,5-dimethyl-1,2-phenylene)dipicolinamide and bzlan = benzylamine, has been synthesized and characterized by elemental analyses, IR, UV-Vis, and 1H NMR spectroscopy. The structure of this complex has been determined by X-ray crystallography. The Me2bpb2– is a di-anionic tetradentate ligand furnishing a N4 set, such that two N atoms of the two pyridine rings and two amido N atoms occupy four equatorial positions. The two benzylamine ligands occupy the two axial positions leading to a distorted octahedral geometry around the central cobalt ion. The electrochemical behavior of this complex in acetonitrile solution indicates that the irreversible oxidation of 4,5-dimethylorthophenylene moiety and reduction of pyridine rings of the free ligand appear as reversible waves in the cyclic voltammogram of its cobalt(III) complex. Concomitant CoIII/CoII redox process and solvolysis in acetonitrile solution is observed. This irreversible redox process becomes reversible in the presence of excess benzylamine.
- انتشار مقاله: 11-09-1393
- نویسندگان: Soraia Meghdadi,Kurt Mereiter,Narges Shams Mohammadi,Ahmad Amiri
- مشاهده