Journal of physical chemistry & biophysics最新文献_第4页

Studies of Solvent Effect of Aquo-Methanol Solvent System on Kinetics and Activation Parameters of Base Catalised Hydrolysis of Ethyl Cinnamate 水-甲醇溶剂体系对肉桂酸乙酯碱催化水解动力学及活化参数的影响研究

Journal of physical chemistry & biophysics Pub Date : 2017-08-11 DOI: 10.4172/2161-0398.1000251

S. Ak

引用次数: 0

Magnetic and Photon Cascade Emission of Gd3+ of NaGd(PO3)4 Monocrystal Under Appropriate Synthesis Conditions 适当合成条件下NaGd(PO3)4单晶Gd3+的磁和光子级联发射

Journal of physical chemistry & biophysics Pub Date : 2017-08-01 DOI: 10.4172/2161-0398.1000255

S. Hammami, S. Sebai, D. Jegouso, V. Reita, N. Boudjada, A. Megriche

{"title":"Magnetic and Photon Cascade Emission of Gd3+ of NaGd(PO3)4 Monocrystal Under Appropriate Synthesis Conditions","authors":"S. Hammami, S. Sebai, D. Jegouso, V. Reita, N. Boudjada, A. Megriche","doi":"10.4172/2161-0398.1000255","DOIUrl":"https://doi.org/10.4172/2161-0398.1000255","url":null,"abstract":"A signal crystal of NaGd(PO3)4 (NGP) was successfully grown with the solid-state reaction method under appropriate synthesis conditions. Structure refinements and the purity of the samples were determined by XRD patterns. It reveals that NaGd(PO3)4 compound crystallizes in the monoclinic system with P 21/n space group and with cell parameters a=7.174(1) A, b=13.033(2) A, c=9.781(1) A, β=90.65(2)°, V=914.47(20) A3 and Z=4. The IR and Raman spectra also indicated that the phosphoric polyhedra of NaGd(PO3)4 has a acyclic symmetry. Differential thermal analysis is given. This compound is thermally stable until 852°C. The magnetic susceptibilities of gadolinium polyphosphate as a function of temperature are reported along with corresponding magnetization measurements. This polyphosphate displays a paramagnetic response, without magnetic phase transitions, and with effective magnetic moments close to those of the corresponding free Gd3+ ions. The luminescence proprieties of Gd3+ was investigated. The emission spectra NGP exhibit intense band at 315 nm due to 6P7/2 →8S7/2 transition of Gd3+ ions when excited at 273 nm. The photon cascade emission (PCE) of Gd3+ has been proved at 164 and 254 nm excitation.","PeriodicalId":94103,"journal":{"name":"Journal of physical chemistry & biophysics","volume":"9 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82229536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Computational and Experimental Study of the Inhibition Effects of Purple Sweet Potato Leaves Extract on Mild Steel Corrosion in 1M H2SO4 紫薯叶提取物对1M H2SO4中低碳钢缓蚀作用的计算与实验研究

Journal of physical chemistry & biophysics Pub Date : 2017-08-01 DOI: 10.4172/2161-0398.1000253

Udowo Vm, Uwah Ie, Daniel Fe, F. Abeng, S. Ivara

引用次数: 3

Natural Actin and Tropomyosin from Molluscan Catch Muscle 天然肌动蛋白和原肌球蛋白从软体动物捕获肌肉

Journal of physical chemistry & biophysics Pub Date : 2017-07-10 DOI: 10.4172/2161-0398.1000249

Ulyana V Girich, S. Lazarev, Ilya G. Vyatchin, O. Matusovsky, N. Shelud’ko

{"title":"Natural Actin and Tropomyosin from Molluscan Catch Muscle","authors":"Ulyana V Girich, S. Lazarev, Ilya G. Vyatchin, O. Matusovsky, N. Shelud’ko","doi":"10.4172/2161-0398.1000249","DOIUrl":"https://doi.org/10.4172/2161-0398.1000249","url":null,"abstract":"In this work, the main proteins of thin filaments (actin and tropomyosin) were isolated from the catch muscle of the mussel Crenomytilus grayanus and the rabbit skeletal muscles. Rabbit actin and tropomyosin and mussel tropomyosin were isolated by traditional methods as opposed to \"natural\" mussel actin (isolation of the mussel actin from acetone powder is impossible). These proteins were used to reconstruct actin+tropomyosin complexes in nonhybrid and hybrid manner. A non-hybrid complex, reconstructed from rabbit actin and tropomyosin, has higher reduced viscosity than complex of mussel proteins where reduced viscosity was nearly indistinguishable from the intrinsic viscosity. ÐÂ’oth rabbit and mussel actin were purified by polymerization-repolymerization cycles followed by gel filtration chromatography. During purification, the viscosity of both actins increased, and the difference in viscosity between them decreased. Based on the SDS-electrophoresis, we did not find any of the other proteins in the chromatographic fractions, except actin. However, obtained chromatographic fractions have significant differences in viscosity and rate of polymerization. We believe that these properties caused by the presence of an \"ending factor” (such as β-actinin or Cap Z) in actin preparations. The data obtained indicate that isolation of “natural” actin is accompanied by a coextraction of an unknown or known \"ending factor\" in amounts that may be greater than those obtained from the acetone powder of rabbit skeletal muscles.","PeriodicalId":94103,"journal":{"name":"Journal of physical chemistry & biophysics","volume":"58 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84899781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Spectroscopic and Molecular Docking Approaches for Investigating theInteraction of Fenvalerate with Human Serum Albumin 研究氰戊菊酯与人血清白蛋白相互作用的光谱和分子对接方法

Journal of physical chemistry & biophysics Pub Date : 2017-06-07 DOI: 10.4172/2161-0398.1000247

Samira Davoudmanesh, Shahrzad Hadichegeni, B. Goliaei, M. Taghizadeh, S. H. Tackallou, F. Taghavi, M. Hashemi

{"title":"Spectroscopic and Molecular Docking Approaches for Investigating theInteraction of Fenvalerate with Human Serum Albumin","authors":"Samira Davoudmanesh, Shahrzad Hadichegeni, B. Goliaei, M. Taghizadeh, S. H. Tackallou, F. Taghavi, M. Hashemi","doi":"10.4172/2161-0398.1000247","DOIUrl":"https://doi.org/10.4172/2161-0398.1000247","url":null,"abstract":"Fenvalerate is an insecticide which is widely utilized in agriculture. In this research, the interaction of fenvalerate with HSA, which is a blood carrier of small molecules such as drugs and toxins, is investigated. Four different methods, UV-Vis, FT-IR spectroscopy, Fluorescence spectroscopy, and molecular modeling were used to characterize the binding properties of fenvalerate with HSA at the molecular level under physiological conditions. The binding constant, which was obtained via UV-Vis spectroscopy, was computed to be KHSA/Fen=3.78 × 10+4 M-1, which indicated a relatively strong binding interactions between ligands and receptors. FT-IR results indicated a decrease in α-helixes from 55% to 50.23% and an increase in β-sheet from 13.96% to 16.82%, β-antiparallel from 6% to 8.93%, were observed on first and thirtieth day and a major decrease of α-helix from 42.99% to 38.82% and an increase in β-sheet from 1.9% to 13.9%, β-antiparallel from 2.21% to 2.53% were observed during ligand binding especially at high concentrations of ligand. The fluorescence intensity of HSA decreased regularly with the gradually increasing concentration of fenvalerate. These results also could be an evidence for binding ligands to the receptors and they were in good agreement with UV-Vis results. On the other hand, a potential binding site in the region III-B of HSA protein was determined via docking calculations. In addition, the obtained results indicate a binding site for interaction of fenvalerate with HSA, which is a chance for excreting this toxin by utilizing HSA protein.","PeriodicalId":94103,"journal":{"name":"Journal of physical chemistry & biophysics","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91440047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Morphologic, Structural, Steric, Energetic and Thermodynamic Studies of the Mechanical Alloy Mg50Ni45Ti5 for Hydrogen Storage 贮氢机械合金Mg50Ni45Ti5的形貌、结构、位阻、能及热力学研究

Journal of physical chemistry & biophysics Pub Date : 2017-06-02 DOI: 10.4172/2161-0398.1000244

Nesrine Mechi, Ismahene Ben Khemis, H. Dhaou, S. Zghal, A. B. Lamine

引用次数: 0

The Possible Mn Hyperfine Interactions and Oxidation States of the Manganese Cluster in OEC Using Multiline Signal (MLS) Simulation Data with Average of Weighted Computations 基于加权平均计算的多线信号(MLS)模拟数据研究OEC中锰簇可能的超细相互作用和氧化态

Journal of physical chemistry & biophysics Pub Date : 2017-05-23 DOI: 10.4172/2161-0398.1000243

Bernard Baituti

{"title":"The Possible Mn Hyperfine Interactions and Oxidation States of the Manganese Cluster in OEC Using Multiline Signal (MLS) Simulation Data with Average of Weighted Computations","authors":"Bernard Baituti","doi":"10.4172/2161-0398.1000243","DOIUrl":"https://doi.org/10.4172/2161-0398.1000243","url":null,"abstract":"Understanding the structure of oxygen evolving complex (OEC) fully still remains a challenge. Lately computational chemistry with the data from more detailed X-ray diffraction (XRD) OEC structure, has been used extensively in exploring the mechanisms of water oxidation in the OEC. The present study involves simulation studies of the X-band continuous wave electron-magnetic resonance (CW-EPR) generated S2 state signals, to investigate whether the data is in agreement with the four manganese ions in the OEC, being organised as a ‘3+1’ model or ‘dimer of dimers’ model. The question that still remains is how much does each Mn ion contribute to the “g2multiline” signal through its hyperfine interactions in OEC? This is revealed in part by the structure of multiline signal studied in this project. The method of data analysis involves numerical simulations of the experimental spectra on relevant models of the OEC cluster. The simulations of the X-band CW-EPR multiline spectra, revealed three manganese ions having hyperfine couplings with large anisotropy. These are most likely MnIII centres and these clearly support the ‘low’ oxidation state OEC paradigm model, with a mean oxidation of 3.25 in the S2 state. This is consistent with the earlier data, but the present results clearly indicate that heterogeneity in hyperfine couplings exist in samples as typically prepared.","PeriodicalId":94103,"journal":{"name":"Journal of physical chemistry & biophysics","volume":"139 2 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2017-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83014402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon 聚乙烯亚胺介孔二氧化硅和活性炭吸附CO2的热力学研究

Journal of physical chemistry & biophysics Pub Date : 2017-03-22 DOI: 10.4172/2161-0398.1000239

M. Al-Marri, Al-Saad Ka, Sa Ma, Cortes Dj, Khader Mm

{"title":"Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon","authors":"M. Al-Marri, Al-Saad Ka, Sa Ma, Cortes Dj, Khader Mm","doi":"10.4172/2161-0398.1000239","DOIUrl":"https://doi.org/10.4172/2161-0398.1000239","url":null,"abstract":"A thermodynamic study of the enthalpies of adsorption of CO2 was conducted on polyethyleneimine 10k/ mesoporous silica (PEI-10k/MPS) and activated carbon (AC). These materials were chosen because of their high CO2 sorption capacities at about 85°C for PEI and about 20°C for the AC, therefore can capture CO2 with high efficiency in a wide temperature range. The absolute quantity of adsorbed CO2 as a function of equilibrium pressure at various temperatures was determined experimentally and fitted to isotherms of generalized Langmuir and Toth equations for PEI and AC, respectively. The adsorption of CO2 on PEI was favored with temperature revealing the endothermic nature of the process. On the other hand, CO2 adsorption on the AC was exothermic. The isosteric enthalpy of adsorption on PEI was about constant with CO2 loading at a value of 93 kJ.mol-1, confirming its chemical nature and corroboration with the Langmuir model. The corresponding isosteric enthalpy of the AC was in the range of ~-25 kJ.mol-1 and was continuously decreasing with CO2 loading; confirming the physisorption nature of the process and also that CO2/ CO2 interactions within the adsorption layer was significant.","PeriodicalId":94103,"journal":{"name":"Journal of physical chemistry & biophysics","volume":"81 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2017-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77095745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Ruthenium Chloride Catalyzed Oxidation of Fast Green FCF Dye with 1-Chlorobenzotriazole in HCl Medium: A Spectrophotometric Kinetic and Mechanistic Study 氯化钌催化1-氯苯并三唑在盐酸介质中氧化快绿FCF染料的光度动力学及机理研究

Journal of physical chemistry & biophysics Pub Date : 2017-03-20 DOI: 10.4172/2161-0398.1000240

Prema Kadappa Reddy, F. Omar, Asha T Iyengar

引用次数: 1

Solvent Effect on the Enthalpy and Entropy of Activation for the Hydrolysis of Ethyl Cinnamate in Mixed Solvent System 混合溶剂体系中溶剂对肉桂酸乙酯水解焓和活化熵的影响

Journal of physical chemistry & biophysics Pub Date : 2017-03-20 DOI: 10.4172/2161-0398.1000238

S. Ak

引用次数: 2