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Structural and Spectral Studies of Some Geometric Isomers of N-Pivaloyl-Nˊ-dichlorophenyl Thiourea

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Chinese Journal of Structural Chemistry 2013年第3期32卷 349-356页

作者： Muhammad Khawar Rauf Masahiro Ebihara Sarwat sultana Amin Badshah Department of Chemistry Quaid-I-Azam University Department of Chemistry Faculty of EngineeringGifu University Yanagido

N-pivaloyl-Nˊ-（3,4-dichlorophenyl）thiourea （1）： monoclinic, P21/a, a=11.57（1）, b=9.278（8）, c=13.51（1）, β=103.85（1）°, V=1408（2）3 , Z=4, μ=0.598 mm-1 ; N-pivaloyl-N＇-（3,5- dichlorophenyl）thiourea （2）： monoclinic, P21/a, a=7.176（2）, b=16.441（4）, c=11.923（2）, β=92.48（1）°, V=1405.3（6）3 , Z=4, μ=0.600 mm-1 ; N-pivaloyl-Nˊ-（2,6-dichlorophenyl）thiourea （3）： orthorhombic, Pnma, a=26.79（1）, b=8.780（4）, c=5.955（3）, V=1400.7（11）3 , Z=4, μ=0.601 mm-1 . All three complexes have an intramolecular hydrogen bond between NˊH and the carbonyl oxygen. Solution 1H NMR studies （CDCl3） show the NH resonance considerable downfield for each thiourea and their positions, as well as that of NH, is affected by substituents on the phenyl ring.

关键词： pivaloyl thioureas single-crystal XRD-studies hydrogen bonds spectral studies mirror plane

Mixed convection flow in vertical channel with boundary conditions of third kind in presence of heat source/sink

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Applied Mathematics and Mechanics(English Edition) 2012年第8期33卷 1015-1034页

作者： J.C.UMAVATHI J.PRATHAP KUMAR JAWERIYA sultana Department of Mathematics Gulbarga UniversityGulbarga 585106KarnatakaIndia

The effects of viscous dissipation and heat source/sink on fully developed mixed convection for the laminar flow in a parallel-plate vertical channel are investigated. The plate exchanges heat with an external fluid. Both conditions of equal and different reference temperatures of the external fluid are considered. First, the simple cases of the negligible Brinkman number or the negligible Grashof number are solved analytically. Then, the combined effects of buoyancy forces and viscous dissipation in the presence of heat source/sink are analyzed by a perturbation series method valid for small values of the perturbation parameter. To relax the conditions on the perturbation parameter, the velocity and temperature fields are solved by using the Runge-Kutta fourth-order method with the shooting technique. The velocity, temperature, skin friction, and Nusselt num- bers at the plates are discussed numerically and presented through graphs.

关键词： mixed convection viscous fluid perturbation method Runge-Kuttashooting method heat source/sink

Development and Validation of a Liquid Chromatographic Method for the Determination of Leflunomide： Application to in vitro Drug Metal Interactions

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Chinese Journal of Chemistry 2011年第9期29卷 1933-1938页

作者： sultana, Najma Muhammad, Saeed Arayne Khan, Moona Mehboob Nawaz, Muhammd United Biotechnologies Karachi 75290 Pakistan Jinnah Medical and Dental College Karachi Pakistan Department of Chemistry College of Science UAE University A1-Ain P.O. Box 17551 UAE

Leflunomide is a leading drug for the treatment of rheumatoid arthritis. The principle aim of this study was to develop and validate an RP-HPLC method for the determination of leflunomide in bulk and pharmaceutical dosage form using diclofenac sodium as an internal standard. For this purpose, chromatography was accomplished on a Purospher Start, C18 （5 μm, 12.5 cm×0.46 cm） column at ambient temperature. Methanol ： water （80 ： 20, V/V） solvent system was selected as mobile phase, the pH of which was adjusted to 3.4 by ortho-phosphoric acid and de- livered at a flow rate of 1.2 mLomin-1. Seperation of leflunomide and diclofenac sodium was carried out on a Purospher Start, C18 equipped with a UV-visible detector at 248 nm. The suitability of the method for the quantita- tive determination of the drugs is proven by validation in accordance with the requirements laid down by the Inter- national Conference on Harmonization （ICH） guidelines. The method was accurate （99.55%--100.03%）, specific, linear （R2〉0.999） and precise （intra-day precision 0.023%--0.93% and inter-day precision 0.26%--0.944%） in the range of 0.5--20 μg·mL^-1. The minimum limit of detection and quantification in pharmaceutical formulation were 0.05 and 0.15 μ***^-1, respectively. Thus the proposed method is simple, accurate, reproducible and suitable for the routine analysis of leflunomide in pharmaceutical formulations and was applied to study in vitro drug-metal interactions.

关键词： leflunomide liquid chromatography analytical method in vitro interaction metal

Dynamical Analysis of the Stochastic COVID-19 Model Using Piecewise Differential Equation Technique

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2427-2464页

作者： Yu-Ming Chu Sobia sultana Saima Rashid Mohammed Shaaf Alharthi Department of Mathematics Huzhou UniversityHuzhou313000China Department of Mathematics Imam Mohammad Ibn Saud Islamic UniversityRiyadh12211Saudi Arabia Department of Mathematics Government College UniversityFaisalabad38000Pakistan Department of Mathematics and Statistics College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia

Various data sets showing the prevalence of numerous viral diseases have demonstrated that the transmission is not truly *** examples are the spread of Spanish flu and *** aimof this research is to develop a comprehensive nonlinear stochastic model having six cohorts relying on ordinary differential equations via piecewise fractional differential ***,the strength number of the deterministic case is carried ***,for the stochastic model,we show that there is a critical number RS0 that can predict virus persistence and infection *** of the peculiarity of this notion,an interesting way to ensure the existence and uniqueness of the global positive solution characterized by the stochastic COVID-19 model is established by creating a sequence of appropriate Lyapunov *** ergodic stationary distribution for the stochastic COVID-19 model is *** findings demonstrate a piecewise numerical technique to generate simulation studies for these *** collected outcomes leave no doubt that this conception is a revolutionary doorway that will assist mankind in good perspective nature.

关键词： COVID-19 epidemic model piecewise fractional differential operators piecewise numerical scheme extinction ergodicity and stationary distribution

Dissolution kinetics of iron oxides in clay in oxalic acid solutions

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International Journal of Minerals,Metallurgy and Materials 2012年第12期19卷 1083-1087页

作者： U.K. sultana A.S.W. Kurny Department of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology

Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were per-formed in aqueous solutions of oxalic acid of 0.2-2 mol/L at 40-80 C for up to 90 min. The mixed kinetic mechanism, i.e., t/τ=[（1 2X/3）（1 X）2/3 ]＋b[ 1 （1 X）1/3], seemed to be the most appropriate one to fit the kinetic data of leaching iron oxides contained in clay in the aqueous oxalic acid solutions. The Arrhenius activation energy for leaching in the 1.8 mol/L oxalic acid was found to be 41.035 kJ/mol.

关键词： clay iron oxides leaching oxalic acid kinetics activation energy

Tea tree oil,a vibrant source of neuroprotection via neuroinflammation inhibition:a critical insight into repurposing Melaleuca alternifolia by unfolding its characteristics

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2023年第7期24卷 554-573页

作者： Md Atiar RAHMAN Abida sultana Mohammad Forhad KHAN Rachasak BOONHOK Sharmin AFROZ Department of Biochemistry and Molecular Biology University of ChittagongChittagong-4331Bangladesh School of Allied Health Sciences Walailak UniversityNakhon Si Thammarat 80160Thailand Department of Chemistry University of Massachusetts BostonBostonMA 02125USA Department of Medical Technology School of Allied Health Sciencesand Research Excellence Center for Innovation and Health Products(RECIHP)Walailak UniversityNakhon Si Thammarat 80160Thailand Department of Theoretical and Computational Chemistry University of DhakaDhaka-1000Bangladesh

Over the past few decades,complementary and alternative treatments have become increasingly popular *** purported therapeutic characteristics of natural products have come under increased scrutiny both in vitro and in vivo as part of efforts to legitimize their *** such product is tea tree oil(TTO),a volatile essential oil primarily obtained from the native Australian plant,Melaleuca alternifolia,which has diverse traditional and industrial applications such as topical preparations for the treatment of skin *** anti-inflammatory-linked immunomodulatory actions have also been *** systematic review focuses on the anti-inflammatory effects of TTO and its main components that have shown strong immunomodulatory *** extensive literature search was performed electronically for data curation on worldwide accepted scientific databases,such as Web of Science,Google Scholar,PubMed,ScienceDirect,Scopus,and esteemed publishers such as Elsevier,Springer,Frontiers,and Taylor&*** that the majority of pharmacological studies were conducted on crude oils only,the extracted data were critically analyzed to gain further insight into the prospects of TTO being used as a neuroprotective agent by drug formulation or dietary *** addition,the active constituents contributing to the activity of TTO have not been well justified,and the core mechanisms need to be unveiled especially for anti-inflammatory and immunomodulatory effects leading to ***,this review attempts to correlate the anti-inflammatory and immunomodulatory activity of TTO with its neuroprotective mechanisms.

关键词： Tea tree oil Anti-inflammatory Anti-viral Antibacterial Terpinen-4-ol18-Cineole Neuroprotective effect

An Analysis of the Lifestyle and Mental Health Status of Adult People Living in Dhaka City: A Cross-Sectional Study in Post COVID-19 Era

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Prevalence and Factors Associated with Concomitant Chinese Medicine Use by Rheumatoid Arthritis Patients in A Multi-Ethnic Asian Population

Advances in Infectious Diseases（传染病进展） 2024年第2期 393页

作者： Tania Ahmed Chowdhury Nasrin Akhter Ishrat Hossain Rezwana Jahan Pallabi sultana Mohammad Jahangir Alam

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Chinese Journal of Integrative Medicine 2022年第3期28卷 223-228页

作者： HUANG You-yi XIN Xiao-hui Rehena sultana Julian Thumboo FONG Kok Yong Duke-NUS Medical School Singapore Department of Rheumatology and Immunology Singapore General HospitalSingapore Medicine Academic Clinical Program Division of MedicineSingapore General HospitalSingapore Centre for Quantitative Medicine Duke-NUS Medical SchoolSingapore

Objective:To determine the prevalence,factors associated with and patterns of concomitant Chinese medicine(CM)with Western treatment use among patients with rheumatoid arthritis(RA)in a tertiary referral centre(Singapore General Hospital)in ***:We conducted a cross-sectional intervieweradministered survey of a consecutive sample of patients with RA in Singapore General Hospital centre regarding their CM use including data on patient demographics,disease characteristics,concomitant use of CM and reasons,concerns and disclosure patterns from March to August *** and multivariate logistic regression analyses were performed to determine the associations of CM ***:Prevalence of CM use among the 258 patients surveyed(male:female 42:216;Chinese:Malay:Indian 191:29:34;mean age:61 years;mean duration of RA:10 years)was 46.1%(119/258).On muutivariate analysis,Chinese ethnicity(OR,95%CI:4.11,1.49-11.36),Chinese speakers(OR,95%CI:2.35,1.03-5.54),middle-income group(OR,95%CI:2.53,1.01-6.31)and greater learned helplessness(OR,95%CI:1.13,1.04-1.22)were significantly associated with CM *** CM users disclosed their CM use to CM physicians(87.3%,96/110),sought advice from them on treatment interactions(59.4%,57/96)and how best to combine treatments(49.0%,47/96)than did so with rheumatologists(42.0%,50/119;40.0%,20/50;and 42.0%,21/50,respectively).Forty-two percentage(29/69)of patients who concealed CM use from rheumatologists because their rheumatologists did not specifically enquire about CM ***:Concomitant CM use among patients with RA treated in a tertiary referral centre in Singapore is high but voluntary disclosure is *** associations identified can help doctors identify and enquire about CM use,minimizing potential adverse interactions.

关键词： pevalence rheumatoid arthritis Chinese medicine complementary therapies

ON POINTWISE R-SUBWEAKLY COMMUTING MAPS AND BEST APPROXIMATIONS

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Analysis in Theory and Applications 2008年第1期24卷 40-49页

作者： F. Akbar N. sultana University of Sargodha Pakistan

The main purpose of this paper is to prove some common fixed point theorems for pointwise R-subweakly commuting maps on non-starshaped domains in p-normed spaces and locally convex topological vector spaces. As applications, invariant approximation results are established. This work provides extension as well as substantial improvement of several results in the existing literature.

关键词： common fixed point contractive family of functions pointwise R-subweaklycommuting maps invariant approximation