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Effect of Cationic Micelles on the Kinetics of Interaction of [Cr(Ⅲ)-Gly-Gly]^2＋ with Ninhydrin

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物理化学学报 2008年第12期24卷 2207-2213页

作者： AKRAM Mohd ZAIDI Neelam Hazoor KABIR-ud-DIN Department of Chemistry Aligarh Muslim University Aligarh-202002 India

The effect of cationic micelles of cetyltrimethylammonium bromide (CTAB) on the interaction of chromium dipeptide complex ([Cr(Ⅲ)-Gly-Gly]2+) with ninhydrin under varying conditions has been investigated. The rates of the reaction were determined in both water and surfactant micelles in the absence and presence of various organic and inorganic salts at 70 ℃ and pH 5.0. The reaction followed first- and fractional-order kinetics with respect to [Cr(Ⅲ)- Gly-Gly2+] and [ninhydrin]. Increase in the total concentration of CTAB from 0 to 40×10-3 mol·dm-3 resulted in an increase in the pseudo-first-order rate constant (kψ) by a factor of ca 3. Quantitative kinetic analysis of kψ-[CTAB] data was performed on the basis of the pseudo-phase model of the micelles. As added salts induce structural changes in micellar systems that may modify the substrate-surfactant interactions, the effect of some inorganic (NaBr, NaCl, Na2SO4) and organic (NaBenz, NaSal, NaTos) salts on the rate was also explored. It was found that the tightly bound counterions (derived from organic salts) were the most effective.

关键词：阳离子胶束动力学相互作用甘氨酸甘氨酸茚三酮

Soft tissue compartment bleed-the iceberg phenomenon:a case report

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Emergency and Critical Care Medicine 2023年第1期3卷 32-35页

作者： Ramesh Vaidyanathan Parvez Mohi ud Din Dar Dinesh Bagaria Amit Gupta Division of Trauma Surgery and Critical Care Jai Prakash Narayan Apex Trauma CenterAll India Institute of Medical SciencesNew DelhiIndia Department of Trauma and Emergency Medicine All India Institute of Medical SciencesVijaypurJammuJammu and KashmirIndia

Introduction:Hemorrhage control is the essence of trauma *** teaching is 1 on the floor(ie,external bleeding)and 4 more(thoracic cavity,abdomen,retroperitoneum,and long bones).In this case report,we present a unique case with concealed bleeding into the soft tissue compartment leading to *** case triggered to consider the soft tissue compartment as the sixth potential bleeding site in trauma patients in hemorrhagic *** presentation:We present the case with concealed bleeding into the soft tissue compartment posing a challenge in *** presentation,he had a pulse rate of 117 beats/min,a blood pressure of 90/60mmHg,and a Glasgow Coma Scale(GCS)score of *** resuscitation,the patient's blood pressure dropped to 70/46 mmHg with a GCS of 7 of *** was then intubated and ***-enhanced computed tomography of the torso revealed a right scapular fracture with a large soft tissue hematoma along the right side of the neck and chest wall,extending up to the right lumbar ***:We suggest that the soft tissue compartment is the sixth potential site of internal bleeding in trauma patients,which should not be overlooked after having ruled out the other 5 sites.

关键词： Case report Hemorrhage Shock Soft tissue injury Trauma

Origin of Quartz Cement in the Paleogene Sandstone Reservoir of Shahejie Formation,Bohai Bay Basin,China

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Acta Geologica Sinica(English Edition) 2022年第1期96卷 248-260页

作者： Muhammad KASHIF CAO Yingchang Nizam ud DIN Uzair SIDDIQUE XI Kelai Faisal REHMAN Noor AHMED GU Xihao Mohammad Saleh GAGHMAN Department of Earth sciences University of SargodhaSargodha 40100Pakistan School of Geosciences China University of PetroleumQingdaoShandong 266580China College of Earth sciences and Engineering Hohai UniversityNanjing 210098China Institute of Marine Geology and Resources Ocean CollegeZhejiang UniversityZhoushanZhejiang 316021China Department of Earth sciences Quaid-I-Azam UniversityIslamabad 45320Pakistan

The precipitation of authigenic quartz plays a significant role to reduce the reservoir characteristics and enhance the stiffness of the *** Es_(1) sandstone of Shahejie Formation is acting as a significant hydrocarbon producing rock in the Nanpu *** methods like thin section petrography,cathodoluminescence(CL),scanning electron microscope(SEM,with EDS),and electron microprobe analysis has been used to reveal the origin of quartz cement as well as to evaluate the effect of quartz cement on reservoir *** studied sandstone is classified as immature to mature feldspathic litharenite and lithic arkose and consists of quartz,feldspar,rock fragments and *** studies and SEM analysis shows that the authigenic quartz is acting a significant cement that reduces the reservoir *** clay minerals(kaolinite and mixed layer illite to smectite)are dominant in the Es_(1) sandstone,that can reduce the reservoir ***,CL and thin section analysis reveal that there are two stages of quartz cement in the studied samples;that are pore filling authigenic cement and quartz overgrowth *** inclusion homogenization temperatures shows that stages of quartz cement were developed with continuous process from 70℃ to 130℃.Quartz cements were generally originated from I/S reaction,feldspar dissolution,conversion of rock fragments and pressure *** dissolution(K-feldspar)and kaolinite to illite reaction is an insignificant silica source for the silica cement which is internally precipitated in a close system with diffusion transporting ***,quartz cement significantly enhance the rock strengthen and brittleness effectively as well as it reduce the overall reservoir quality.

关键词： origin authigenic quartz silica sources diffusion Shahejie Formation

Effect of regional factor productivity on manufacturing sector: The case of Sino-Pak economic ties

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Financial Innovation 2020年第1期6卷 95-108页

作者： Muhammad Imran An HuSen Muhammad Kaleem Arshad Khan Bangash Nizam ud Din Sobia Department of Economics Bacha Khan UniversityCharsaddaPakistan School of Economics Nankai UniversitTianjinChina Department of Sociology and Gender Studies Bacha Khan UniversityCharsaddaPakistan Department of Business Administration Karakoram International UniversityGilgitPakistan Government Postgraduate Jahanzeb College SwatPakistan

Introduction:Economic ties and trade blocs increase the flow of trade between participating countries and lead to different levels of economic and structural *** description:This paper focuses on the structure of industrial value-added between China and Pakistan,as the two countries recently launched the CPEC(China-Pakistan Economic Corridor)*** and evaluation:This study utilizes panel data from 1995 to 2015 to test certain factor effects on regional value-added through econometric *** results show that each country has its own economic growth rate and market size that respond differently to industrial value-added ***:Aggregate factor productivity at China is higher than in Pakistan but growth in factor productivity in the latter is higher than the former;similarly,the share of bilateral trade is higher in the case of *** each country responds differently to the new economic ties,the macroeconomic results support bilateral economic ties between them.

关键词： New economic geography China-Pakistan economic-ties Factor productivities

Fabrication of MXene-Bi_(2)WO_(6)heterojunction by Bi_(2)Ti_(2)O_(7)hinge for extraordinary LED-light-driven photocatalytic performance

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Nano Research 2024年第6期17卷 4729-4736页

作者： Zhiwen Li Liangliang Xu Zaheer ud Din Babar Ali Raza Yifei Zhang Xinrui Gu Yu-Xin Miao Zhen Zhao Gao Li Institute of Catalysis for Energy and Environment College of Chemistry and Chemical EngineeringShenyang Normal UniversityShenyang 110034China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Scuola Superiore Meridionale(SSM) University of Naples Federico IILargo S.Marcellino1080138Italy Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea University of Chinese Academy of Sciences Beijing 100049China

Heterojunction composites with intimate interfaces can shorten the diffusion distance,which leads to a shorter path for photogenerated carriers,thereby increasing photocatalytic ***,we report the fabrication of Ti_(3)C_(2)-Bi_(2)WO_(6)(TC-BW)heterojunctions hinged by Bi_(2)Ti_(2)O_(7)joints via an in situ hydrothermal reaction of Ti_(3)C_(2)in the presence of Na_(2)WO_(4)and Bi(NO_(3))_(3).The TC-BW was characterized using X-ray diffraction(XRD),scanning transmission electron microscopy(STEM),and Raman ***-BW showed superior photocatalytic activity(productivity over 15TC-WB reaches up to 5.0 mmolreacted BA·gcat.^(−1)·h^(−1))in the oxidation of benzyl alcohol using light-emitting diode(LED)light,arising from the surface defects and intimate heterojunction interface between the Ti_(3)C_(2)MXene and Bi_(2)WO_(6)***-BW heterojunctions provide an enhanced separation efficiency of photogenerated charges,which in turn yields superior photocatalytic ***,it is well substantiated by density functional theory(DFT)*** summary,this study elucidates the preparation of heterojunction composites with intimate interfaces for highly efficient photooxidation.

关键词： MXene-Bi_(2)WO_(6) heterojunction LED-light-driven photocatalysis Bi_(2)Ti_(2)O_(7) photooxidation

Solubilization of Phenanthrene and Fluorene in Equimolar Binary Mixtures of Gemini/Conventional Surfactants

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Chinese Journal of Chemical Engineering 2014年第9期22卷 1009-1015页

作者： Huma Siddiqui Mohammad Kamil Manorama Panda Kabir-ud-Din Department of Petroleum Studies Aligarh Muslim University Department of Chemistry Aligarh Muslim University

This study deals with the enhanced solubilization of polycyclic aromatic hydrocarbons （PAHs） such as phenanthrene （PHE） and fluorene （FLR） in a pure cationic gemini （G6） and three conventional surfactants [polyethylene glycol dodecyl ether （Brij35）, cetyltrimethyl ammonium bromide （CRAB） and sodium lauryl sulfate （SDS）] as well as in their equimolar binary combinations （G6-Brij35, G6-CTAB and G6-SDS）. Their solubilization efficiency toward PHE and FLR has been quantified in terms of the molar solubilization ratio （MSR） and the micelle-water partition coefficient （Kin）. The ideality/nonideality of the mixed micelles is discussed with the help of Clint, Rubingh and Rosen＇s approaches. These theories determine the deviation of experimental critical micelle concen- tration （CMC） values from ideal critical micelle concentration, which was measured by evaluating the interaction parameters （/3m and/3）. Negative values ofβm were observed in all the equimolar binary systems, which show synergism in the mixed micelles. Whereas at air/liquid interface synergism was observed in the systems G6-CrAB and G6-Brij35; G6-SDS exhibited an antagonistic effect. The order of MSR and Km was G6-CTAB 〉 G6- Brij35 〉 G6-SDS for phenanthrene as well as for fluorene.

关键词： Gemini suffactantMixed micellesCritical micelle concentrationSolubilizationMolar solubilization ratio

Micelle Catalyzed Oxidation of D-Mannose by Cerium (IV) in Sulfuric Acid

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物理化学学报 2008年第5期24卷 810-816页

作者： KABIR-ud-DIN ALI Mohd. Sajid KHAN Zaheer Chemistry Department Aligarh Muslim University Aligarh 202002 UP India Chemistry Department Jamia Millia Islamia Jamia Nagar New Delhi 110025 India

Kinetics of D-mannose oxidation by cerium (IV) was studied in a sulfuric acid medium at 40 ℃ both in absence and presence of ionic micelles. In both cases, the rate of the reaction was first-order in D-mannose and in cerium (IV), which decreased with increasing [H2SO4]. This suggested that the redox reaction followed the same mechanism. The reaction proceeded through formation of an intermediate complex, which was proved by kinetic method. The complex underwent slow unimolecular decomposition to a free radical that reacted with cerium (IV) to afford the product. The catalytic role of cationic cetyltrimethylammonium bromide (CTAB) micelles was best explained by the Menger-Portnoy model. The study of the effect of CTAB also indicated that a negatively charged species was reactive form of cerium (IV). From the kinetic data, micelle-cerium (IV) binding and rate constants in micellar medium were evaluated. The anionic micelle of sodium dodecyl sulfate plays no catalytic role. The oxidation has the rate expression: -d[Ce(IV)]= k1Kc1[D-mannose][Ce(IV)]dt Different activation parameters for micelle catalyzed and uncatalyzed paths were also calculated and discussed.

关键词：甘露糖胶束催化剂硫磺酸化学分析

Foliar Application of Cytokinin Modulates Gas Exchange Features,Water Relation and Biochemical Responses to Improve Growth Performance of Maize under Drought Stress

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Phyton-International Journal of Experimental Botany 2022年第3期91卷 633-649页

作者： M.Rafiqul Islam M.Shahinur Islam Nurunnaher Akter Mohammed Mohi-ud-Din Mohammad Golam Mostofa Department of Agronomy Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Crop Botany Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Department of Biochemistry and Molecular Biology Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur1706Bangladesh Institute of Genomics for Crop Abiotic Stress Tolerance Department of Plant and Soil ScienceTexas Tech UniversityLubbockTX 79409USA

Improvement of plant performance under drought stress is crucial to sustaining agricultural *** current study investigated the ameliorative effects of foliar-applied kinetin,an adenine-type cytokinin(CK),on growth and gas exchange parameters,water relations and biochemical attributes of maize plants under drought ***-day-old maize plants were subjected to drought by maintaining soil moisture content at 25%field capacity for 8 days followed by foliar application of kinetin at 0,75,150 and 225 mg L^(−1)(CK0,CK75,CK150 and CK225,respectively)to the plants for two-times at the 9-day *** revealed that drought stress markedly reduced stem diameter,dry weight,chlorophyll content,gas exchange parameters and water balance but increased proline,malondialdehyde and soluble sugar contents,electrolyte leakage and senescence in maize *** of exogenous CK remarkably improved maize performance by modulating growth,gas exchange-and water relation-related parameters in a dose-dependent manner under drought ***225 increased chlorophyll content(by 61.54%),relative water content(by 49.14%),net photosynthesis rate(by 39.94%)and transpiration rate(by 121.36%)and also delayed leaf senescence but decreased internal CO_(2)concentration(by 7.38%),water saturation deficit(by 40.40%)and water uptake capacity(by 42.49%)in both well-watered and droughtstressed ***,CK application considerably decreased electrolyte leakage,proline,malondialdehyde and soluble sugar levels in drought-stressed maize plants,as also supported by heatmap and cluster *** together,exogenous CK at proper concentration(225 mg L^(−1))successfully improved maize performance under drought conditions,thereby suggesting CK application as a useful approach to alleviate drought-induced adverse effects in maize plants,and perhaps in other important crop plants.

关键词： Cytokinin drought maize osmoprotection photosynthesis water-use-efficiency

TX-114+TBAB体系中非电解质对CP的影响(英文)

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物理化学学报 2008年第7期24卷 1180-1184页

作者： KABIR-ud-DIN KHATOON Suraiya NAQVI Andleeb Z Department of Chemistry Aligarh Muslim University

The effects of nonelectrolytes (ureas, amino acids, sugars) on the cloud point (CP) of nonionic surfactant Triton X-114 (TX-114) and tetra-n-butylammonium bromide (TBAB) system were studied. Ureas as well as thioureas increased the CP. Behaviors of amino acids depended upon their nature. Nonpolar and uncharged polar amino acids were less effective in changing the CP. However, tryptophan and phenylalanine increased the CP sharply. Acidic amino acid (aspartic acid) and sugars decreased the CP. The results were explained in terms of their effect on water structure. Amino acids got solubilized either in the micellar interior or in the bulk phase.

关键词：非电解质氨基酸化学分析浊点