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Mathematical model for the ciliary-induced transport of seminal liquids through the ductuli efferentes

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International Journal of Biomathematics 2017年第3期10卷 1-17页

作者： A. A. Farooq A. M. siddiqui Department of Mathematics COMSATS Institute of Information Technology Tobe Camp Abbottabad Pakistan Department of Mathematics Pennsylvania State University York Campus York PA 17403-3398 USA

This study describes the consequences of the ciliary motion on the transport of seminal liquid through the ductus efferentes of the male reproductive tract. By assuming the seminal liquid as a couple stress fluid, we have formulated a mathematical model for a two-dimensional flow through an axially symmetric tube whose inner surface is ciliated in the form of a metachronal wave. The governing system consists of nonlinear coupled partial differential equations which is reduced to a system of ordinary differential equa- tions by utilizing the long wavelength approximation in an environment of the inertia free flow. Exact solutions for the velocity distribution, the pressure gradient and the stream function are obtained in terms of the couple stress parameters and the ciliary metachronism. Special attention is given to the pumping and the trapping characteristics due to the cilia motility. The study reveals that the ciliary pumping has to be more efficient to transport a couple stress fluid as compared to a Newtonian fluid. Moreover, the theoretical results for the couple stress fluid are found to be in good agreement with those reported by IT. J. Laxdner and W. J. Shack, Cilia transport, Bull. Math, Biophys, 34 （1972） 325-335]. The analytical results are also displayed in graphical form.

关键词： Ciliary-induced flow metachronal wave couple stress fluid axisymmetric tube.

Foliation and the First Law of Black Hole Thermodynamics

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Chinese Physics Letters 2011年第5期28卷 54-56页

作者： Azad A.siddiqui Syed Muhammad Jawwad Riaz M.Akbar Department of Basic Sciences and Humanities EME CollegeNational University of Sciences and Technology(NUST)Peshawar RoadRawalpindiPakistan Centre for Advanced Mathematics and Physics National University of Sciences and Technology(NUST)Sector H-12IslamabadPakistan

There has been lots of interest in exploring the thermodynamic properties at the horizon of a black hole *** has been shown earlier that for different spacetimes,the Einstein field equations at the horizon can be expressed as the first law of black hole *** the idea of foliation,we develop a simpler procedure toobtain such *** considerγ=constant slices,for the Schwarzschild and Reissner-Nordstrom black hole *** Einstein field equations for the induced 3-dimensional metrics of the hypersurfaces are expressed in thermodynamic quantities under the virtual displacements of the *** expected,it is found that the field equations of the induced metric corresponding to the horizon can be written as afirst law of black hole *** is to be mentioned here that our procedure is much easier,to obtain such results,as here one has to essentially deal with(n-1)-dimensional induced metric for an n-dimensional spacetime.

关键词： thermodynamic Einstein mentioned

Effect of Cu/Zn Substitution in MgO Nanostructures for Tuning the Optical Bandgap and Structural Properties

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1035-1040页

作者： ATIF Dawar S NASEEM Shah M ASIF siddiqui YASMEEN Bibi Department of Physics Federal Urdu University of ArtsScience and TechnologyKarachiPakistan Department of Chemistry Federal Urdu University of ArtsScience and TechnologyKarachiPakistan

Low cost co-precipitation method was used to synthesize Cu(0-0.05)doped MgO samples with fixed concertation of Zn=0.01.X-ray diffraction(XRD)spectra confirmed the phase purity of the samples for 0≤Cu≤0.03 doping *** secondary phase for 0.04≤Cu≤0.05 exhibited the formation of mixed metal *** crystallite size was found to increase from 17.5 to 23.5 nm for 0≤Cu≤0.03 and then decreased from 22 to 18.5 nm for 0.04≤Cu≤*** estimated bandgap first reduced from 5.48 to 4.88 eV and then increased from 5.21 to 5.36 *** morphology of the samples transformed from spheroidal shape to star-like *** obtained results reveal that the structural and optical property are in good agreement with the morphological *** peak shifting towards the lower values of vibrational frequency from 694 to 579 cm^(-1) confirms the incorporation of Cu/Zn in Mg-O *** tuning of optical bandgap and structural properties with varying dopant concentration in MgO nanomaterials can be used for multifunctional modern energy storage and optoelectronic devices.

关键词： Cu/Zn doping MgO optical bandgap morphology vibrational modes

MHC （Makkah Health City）： A Futuristic Approach

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Journal of Health Science 2015年第4期3卷 148-149页

作者： zohair Ahmad Sebai King Faisal University Dammam 21514 Saudi Arabia

A Health City, to be known as Makkah Health City, is in the process of being established in Makkah, Saudi Arabia. It will be composed of a health promoting hospital, and a college of medicine and health sciences that would aim at training doctors and other members of the health team, whose practice of medicine would be holistic. Our ultimate goal is for MHC to be a model for other health institutions to emulate.

关键词： Medical education health promoting hospitals comprehensive health care health in the Middle East.

EXACT SOLUTIONS FOR MAGNETOHYDRODYNAMIC FLOW IN A ROTATING FLUID

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Acta Mechanica Sinica 2002年第3期18卷 244-251页

作者： S. Asghar Masood Khan A.M. siddiqui T. Hayat Department of Mathematics Quaid-i-Azam University Islamabad Pakistan Department of Mathematics Pennsylvania State University York Campus 1031 Edgecomb Avenue New York PA 17403 USA

An analytical solution is obtained for the flow due to solid-body rotations an oscillating porous disk and of a fluid at infinity. Neglecting the induced magnetic field, the effects of the transversely applied magnetic field on the flow are studied. Further, the flow confined between two disks is also discussed. It is found that an infinite number of solutions exist for the flow confined between two disks.

关键词： rotating fluid porous disk double disks magnetohydrodynamic flow

Hepatic inflammation:an important target for biomarker development in nonalcoholic fatty liver disease

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Hepatobiliary Surgery and Nutrition 2023年第3期12卷 447-449页

作者： Hiba Khan Mohammad Shadab siddiqui Department of Internal Medicine Virginia Commonwealth UniversityRichmondVAUSA Division of Gastroenterology Hepatology and NutritionVirginia Commonwealth UniversityRichmondVAUSA

Nonalcoholic fatty liver disease(NAFLD)is the most common chronic liver disease globally and liver biopsy remains central to diagnosis and risk stratification(1,2).There is currently an immense unmet need to develop non-invasive biomarkers to help establish the diagnosis,disease activity,and disease severity in NAFLD in clinical practice to reduce the need for liver biopsies(3).Unable to identify patients with nonalcoholic steatohepatitis(NASH),the clinically aggressive variant of NAFLD,or significant fibrosis readily in clinical practice presents challenges in management of patients with NAFLD and is one of the reasons why incidence of NASH related cirrhosis is rapidly ***,as there is currently no approved therapy for treatment of NASH,there are several novel therapeutics in clinical trials for treatment of ***,enrollment in these clinical trials has been challenging due to high screen failure rates with the most common reason being disqualifying liver *** non-invasive risk stratification to identify patients with suspect NASH undergoing liver biopsy for clinical trial consideration to reduce the screen failure rates will not only facilitate development of therapeutics but also ***,non-invasive and cheap biomarkers that can be readily deployed in wide clinical settings are urgently needed in clinical and research setting to mitigate the projected increase in NASH related cirrhosis.

关键词： Nonalcoholic fatty liver disease(NAFLD) biomarker inflammation magnetic resonance imaging

Prestroke selective serotonin reuptake inhibitor use and functional outcomes after ischaemic stroke

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Stroke & Vascular Neurology 2018年第1期3卷 9-16页

作者： Mark R Etherton Khawja A siddiqui Lee H Schwamm Department of Neurology Harvard Medical SchoolBostonMassachusettsUSA Department of Neurology Massachusetts General HospitalBostonMassachusettsUSA

background Selective serotonin reuptake inhibitors(SSRIs)have been implicated in contributing to recovery after acute ischaemic *** particular,poststroke initiation of an SSRI has been demonstrated to improve motor *** role of prestroke SSRI use on functional outcomes and stroke recovery is less *** aimed to examine the effect of prestroke SSRI use on metrics of hospitalisation and functional *** We included 4968 consecutive patients from January 2006 to June 2015 in our local Get With The Guidelines-Stroke registry in whom a preadmission drug list could be extracted from an administrative research data *** and multivariate analyses were performed to identify predictors of functional *** On univariate analysis,among 4698 ischaemic strokes(740 SSRI users and 3948 non-users),SSRI use before acute ischaemic stroke did not impact the National Institutes of Health Stroke Scale(NIHSS)admission score,length of stay or rate of symptomatic *** using SSRIs prior to their stroke were more likely to present with weakness(57% vs 47.3%;P<0.001)and have hospitalisations complicated by pneumonia(7.6% vs 5.7%;P<0.001).Moreover,prestroke SSRI use was associated with a negative impact on ambulatory status at discharge and discharge to *** multivariate regression analysis,SSRI use was associated with lower likelihood of discharge to home(adjusted OR 0.79,95% CI 0.62 to 0.997,P<0.05).Conclusions SSRI use preceding an acute ischaemic stroke is associated with lower rates of discharge to home despite no significant increase in length of stay or NIHSS score.

关键词： functional likely stroke

Vegetation-environment relationships in the forests of Chitral district Hindukush range of Pakistan

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Journal of Forestry Research 2013年第2期24卷 205-216页

作者： Nasrullah Khan Syed Shahid Shaukat Moinuddin Ahmed Muhammad Faheem siddiqui Department of Botany University of Malakand Dept. of Botany University of Karachi Laboratory of Dendrochronology and Plant Ecology Department of Botany Federal Urdu University of Arts Science and Technology

We investigated the composition of plant communities to quantify their relationships with environmental parameters in the Chitral Hindukush range of Pakistan. We sampled tree vegetation using the Point Centered Quarter （PCQ） method while understory vegetation was sampled in 1.5-m circular quadrats. Cedrus deodara is the national symbol of Pakistan and was dominant in the sampled communities. Because environmental variables determine vegetation types, we analyzed and evaluated edaphic and topographic factors. DCA-Ordination showed the major gradient as an amalgam of elevation （p〈0.05） and slope （p〈0.01） as the topographic factors correlated with species distribution. Soil variables were the factors of environmental significance along DCA axes. However, among these factors, Mg2＋ , K ＋ and N2＋ contributed not more than 0.054% 0.20% and 0.073%, respectively, to variation along the first ordination axis. We conclude that the principal reason for weak or no correlation with many edaphic variables was the anthropogenic disturbance of vegetation. The understory vegetation was composed of perennial herbs in most communities and was most dense under the tree canopy. The understory vegetation strongly regulates tree seedling growth and regeneration patterns. We recommend further study of the understory vegetation using permanent plots to aid development of forest regeneration strategies.

关键词： environmental relationship multivariate analysis cluster analysis ordination anthropogenic factors forest, Hindukush range

Preliminary study of adsorption behavior of bovine serum albumin(BSA) protein and its effect on antibacterial and corrosion property of Ti-3Cu alloy

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Journal of Materials Science & Technology 2021年第21期80卷 117-127页

作者： Muhammad Ali siddiqui Ihsan Ullah Hui Liu Shuyuan Zhang Ling Ren Ke Yang Institute of Metal Research Chinese Academy of Sciences72 Wenhua RoadShenyang110016China School of Materials Science and Engineering University of Science and Technology of China96 Jinzhai RoadHefei230026China Department of Metallurgical Engineering NED University of Engineering and TechnologyUniversity RoadKarachi75270Pakistan

The adsorption behavior, antibacterial, and corrosion properties of a Ti-3 Cu alloy were studied in a phosphate-buffered saline solution containing 0, 1, 3, and 6 gL^(-1) bovine serum albumin protein at 37℃ and pH = 7.4(±0.2). The protein adsorption behavior was examined via cyclic voltammetry, secondary ions mass spectroscopy(SIMS), and angle-resolved X-ray photoelectron spectroscopy(ARXPS). The corrosion property was analyzed by the open circuit potential(OCP), potentiodynamic polarization(PD),and electrochemical impedance spectroscopy(EIS) examinations. The antibacterial test was conducted according to the GB/T 21510 China Standard. It was observed that the surface charge density(QA DS) was directly proportional to the amount of the adsorbed BSA protein, signifying that the protein adsorption was accompanied by the charge transfer, pointing to chemisorptions phenomena. BSA amino groups and other organic species were observed in the surface analysis examinations. It was shown that the formation of barrier complexes between the TiO_(2) oxide-layer and PBS solution resulted in decreasing the release of Cu-ions, which consequently reduced the antibacterial activity. On the other hand, these barrier complexes improved the corrosion resistance by increasing the charge transfer resistance and double-layer capacitance of the Ti-3 Cu alloy.

关键词： Bovine serum albumin protein Ti-3Cu alloy Antibacterial Corrosion Adsorption behavior