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Release rate kinetics of corrosion inhibitor loaded halloysite nanotube-based anticorrosion coatings on magnesium alloy AZ91d

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Journal of Magnesium and Alloys 2021年第1期9卷 202-215页

作者： Swapnil H.Adsul uday d.bagale Shirish H.Sonawane R.Subasri Centre for Sol-Gel Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)BalapurHyderabad 500005Telangana StateIndia department of Food and Biotechnology South Ural State UniversityChelyabinsk 454080Russia department of Chemical Engineering National Institute of TechnologyWarangal 506004Telangana StateIndia

Halloysite nanotubes were used as nanocontainers to hold corrosion inhibitors such as Ce^(3+)-Zr^(4+),2-mercaptobenzothiazole and 8-hydroxyquinoline in their *** acid assisted etching of the nanotubes was carried out with a view to increase the lumen diameter and thereby,increase the amount of loading of the corrosion *** morphology of as-received and etched halloysite nanotubes was ob-served using TEM *** loading of corrosion inhibitors was confirmed using SEM-EdS and BET *** microcapsules were used as capping agents for the ends of the loaded HNTs following which,they were dispersed into a hybrid sol-gel silica *** coating method was used to generate coatings on AZ91d substrates followed by heat treatment at 130℃ for 1 *** release rate kinetics of corrosion inhibitors from as-received and etched nanotubes was investigated in buffer solutions of 3.5 wt%NaCl at different *** release mechanism of corrosion inhibitors from the HNT lumen was validated using various semi-empirical *** were also evaluated for their corrosion protection ability using electrochemical techniques after exposure to 3.5 wt%NaCl solution for 120 *** generated using Ce^(3+)-Zr^(4+)loaded into as-received halloysite nanotubes have shown more effective corrosion protection when compared to other corrosion inhibitors after 120 h exposure to the corrosive medium.

关键词： Sol-gel coating Halloysite nanotubes Corrosion inhibitors Release rate Magnesium alloy AZ91d

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Ultrasound Assisted Synthesis of Starch Nanocrystals and It’s Applications with Polyurethane for Packaging Film

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Journal of Renewable Materials 2020年第3期8卷 239-250页

作者： Vikas S.Hakke uday d.bagale Sami Boufi G.uday Bhaskar Babu Shirish H.Sonawane department of Chemical Engineering National Institute of TechnologyWarangal(TS)506004India University of Sfax Sfax Faculty of ScienceLMSESfaxTunisia

Starch nanocrystals(SNC)were prepared from maize starch using ultrasound assisted acid *** process takes less time for the generation of SNC,which is advantageous over conventional acid *** synthesized SNC were characterized using X-ray diffraction,dynamic light scattering,zeta potential and transmission electron microscopy(TEM).Particle size and TEM data show that the particles were near to 150 nm,with oval *** SNC with higher surface charge are obtained with this innovative approach as compared to conventional acid *** of high surface charge and oval like morphology,the SNC performed well in reinforcing a polyurethane *** rise in crystallinity by 16%was observed due to ultrasound *** the lower concentration of SNC in nanocomposite film,dynamic mechanical analysis demonstrated meaningful increment in mechanical properties of polyurethane nanocomposite *** decrease in chain slippage over the glass transition temperature was observed because of the SNC reinforcement in polyurethane *** to the conventional acid hydrolysis,the present approach for the synthesis of starch nanocrystals is much faster and easier.

关键词： Starch nanocrystal ultrasound acid-hydrolysis nanocomposite TEM

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Stability of three-dimensional printable foam concrete as function of surfactant characteristics

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结构与土木工程前沿:英文版 2023年第6期17卷 935-947页

作者： uday BOddEPALLI Indu Siva Ranjani GANdHI Biranchi PANdA department of Civil Engineering Indian Institute of TechnologyGuwahatiAssam781039India Sustainable Resources for Additive Manufacturing(SReAM)Laboratory Department of Mechanical EngineeringIndian Institute of TechnologyGuwahatiAssam781039India

Extrudability is one of the most critical factors when designing three-dimensional printable foam *** extrusion process likely affects the foam stability which necessitates the investigation into surfactant properties particularly for concrete mixes with high foam *** many studies have been conducted on traditional foam concrete in this context,studies on three-dimensional printed foam concrete are *** address this research gap,the effects of surfactant characteristics on the stability,extrudability,and buildability of three-dimensional printed foam concrete mixes with two design densities(1000 and 1300 kg/m^(3))using two different surfactants and stabilizers(synthetic-based sodium lauryl sulfate stabilized with carboxymethyl cellulose sodium salt,and natural-based hingot surfactant stabilized with xanthan gum)were investigated in this *** density tests were conducted before and after the extrusion to determine stability of the foam *** results were then correlated with surfactant qualities,such as viscosity and surface tension,to understand the importance of key parameters in three-dimensional printing of foam *** on the experimental results,surfactant solu1tion with viscosity exceeding 5 m Pa·s and surface tension lower than 31 mN/m was recommended to yield stable three-dimensional printable foam concrete ***,the volume of foam in the mix significantly affected the printability *** traditional foam concrete,the variation in the stabilizer concentration and density of concrete were found to have insignificant effect on the fresh-state-characteristics(slump,slump flow,and static yield stress)and air void microstructure of the stable mixes.

关键词： foam concrete 3d printable concrete stability rheology air void microstructure

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Observation of Zitterbewegung in photonic microcavities

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Light(Science & Applications) 2023年第6期12卷 1084-1090页

作者： Seth Lovett Paul M.Walker Alexey Osipov Alexey Yulin Pooja uday Naik Charles E.Whittaker Ivan A.Shelykh Maurice S.Skolnick dmitry N.Krizhanovskii department of Physics and Astronomy University of SheffieldS37RH SheffieldUK department of Physics and Technology ITMO UniversitySt.Petersburg 197101Russia Science Institute University of IcelandDunhagi 3IS-107 ReykjavikIceland

We present and experimentally study the effects of the photonic spin–orbit coupling on the real space propagation of polariton wavepackets in planar semiconductor microcavities and polaritonic analogues of *** particular,we demonstrate the appearance of an analogue Zitterbewegung effect,a term which translates as‘trembling motion’in English,which was originally proposed for relativistic dirac electrons and consisted of the oscillations of the centre of mass of a wavepacket in the direction perpendicular to its *** a planar microcavity,we observe regular Zitterbewegung oscillations whose amplitude and period depend on the wavevector of the *** then extend these results to a honeycomb lattice of coupled microcavity *** to the planar cavity,such lattices are inherently more tuneable and versatile,allowing simulation of the Hamiltonians of a wide range of important physical *** observe an oscillation pattern related to the presence of the spin-split dirac cones in the *** both cases,the experimentally observed oscillations are in good agreement with theoretical modelling and independently measured bandstructure parameters,providing strong evidence for the observation of Zitterbewegung.

关键词： planar versatile analogues

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LC and LC–MS/MS studies for the identification and characterization of degradation products of acebutolol

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Journal of Pharmaceutical Analysis 2018年第6期8卷 357-365页

作者： uday Rakibe Ravi Tiwari Anand Mahajan Vipul Rane Pravin Wakte department of Chemical Technology Dr.Babasaheb Ambedkar Marathwada University department of Pharmaceutical Sciences SVKM's NMIMS department of Pharmaceutical Analysis Goa College of Pharmacy

The aim of the present investigation was to demonstrate an approach involving use of liquid chromatography(LC) and liquid chromatography-mass spectrometry(LC–MS) to separate, identify and characterize very small quantities of degradation products(dPs) of acebutolol without their isolation from the reaction mixtures. The drug was subjected to oxidative, hydrolytic, thermal and photolytic stress conditions as per International Conference on Harmonization(ICH) guideline Q1 A(R2). Among all the stress conditions the drug was found to be labile in hydrolytic(acidic & basic) and photolytic stress conditions, while it was stable in water-induced hydrolysis, oxidative and thermal stress conditions. A total of four degradation products were formed. A C18 column was employed for the separation of all the dPs on a gradient mode by using high-performance liquid chromatography(HPLC). All the dPs were characterized with the help of their fragmentation pattern and the masses obtained upon LC–MS/MS and MSnanalysis. All the hitherto unknown degradation products were identified as 1-(2-(2-hydroxy-3-(isopropylamino)propoxy)-5-(amino)phenyl)ethanone(dP-I), N-(4-(2-hydroxy-3-(isopropylamino)propoxy)-3-acetylphenyl)acrylamide(dP-II), 1-(2-(2-hydroxy-3-(isopropylamino)propoxy)-5-(hydroxymethylamino)phenyl)ethanone(dP-III) and 1-(6-(2-hydroxy-3-(isopropylamino)propoxy)-2,3-dihydro-2-propylbenzo[d]oxazol-5-yl)ethanone(dP-IV). Finally the in-silico carcinogenicity and hepatotoxicity predictions of the drug and all the dPs were performed by using toxicity prediction softwares viz., TOPKAT, LAZAR and discovery Studio AdMET. The results of in-silico toxicity studies revealed that acebutolol(0.967) and dP-I(0.986) were found to be carcinogenic, while acebutolol(0.490) and dP-IV(0.437) were found to be hepatotoxic.

关键词： Acebutolol Stress testing LC LC–MS/MS degradation pathway In-silico toxicity

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Studies on the cytocompatibility,mechanical and antimicrobial properties of 3d printed poly(methyl methacrylate)beads

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Bioactive Materials 2018年第2期3卷 157-166页

作者： david K.Mills uday Jammalamadaka Karthik Tappa Jeffery Weisman Center for Biomedical Engineering and Rehabilitation Science USA The School of Biological Sciences Louisiana Tech UniversityRustonLA 71272USA

Osteomyelitis is typically a bacterial infection(usually from Staphylococcus)or,more rarely,a fungal infection of the *** can occur in any bone in the body,but it most often affects the long bones(leg and arm),vertebral(spine),and bones of the *** success in osteomyelitis is due to their ability to form biofilms which inhibit the wound healing process and increases resistance to anti-infective ***,biofilms do not allow easy penetration of antibiotics into their matrix making clinical treatment a *** development of local antibiotic delivery systems that deliver high concentrations of antibiotics to the affected site is an emerging area of research with great *** treatment includes antibiotic therapy,either locally or systemically and refractory cases of osteomyelitis may lead to surgical intervention and a prolonged course of antibiotic treatment involving placement of antibiotic-doped beads or spacers within the wound *** are disadvantages with this treatment modality including insufficient mixing of the antibiotic,lack of uniform bead size,resulting in lower antibiotic availability,and limitations on the antibiotics ***,a method is needed to address biofilm formations in the wound and on the surface of the surgical implants to prevent *** this study,we show that all antibiotics studied were successfully doped into PMMA and antibiotic-doped 3d printed beads,disks,and filaments were easily *** growth inhibition capacity of the antibiotic-loaded PMMA 3d printed constructs was also demonstrated.

关键词： 3d printing Antibacterials drug delivery Halloysite nanotubes Medical devices Nanotechnology

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Noni(Morinda citrifolia L.) fruit juice delays immunosenescence in the lymphocytes in lymph nodes of old F344 rats

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Journal of Integrative Medicine 2018年第3期16卷 199-207页

作者： uday P.Pratap Hannah P.Priyanka Karthik R.Ramanathan Vishak Raman Lalgi Hima Srinivasan Thyagarajan Integrative Medicine Laboratory Department of Biotechnology School of Bioengineering SRM Institute of Science and Technology

Objective： Aging is associated with the development of diseases because of immunosuppression and altered functioning of the neuroendocrine system. The medicinal properties of Morinda citrifolia L. have been widely exploited for the treatment of age-associated diseases. This study aims to investigate the in vitro and in vivo effects of noni（M. citrifolia） fruit juice（NFJ） on neuro-immunomodulation in the lymph node lymphocytes of F344 ***： Lymphocytes isolated from axillary and inguinal lymph nodes of young（3–4 months） and old（18–21 months） rats were treated in vitro with different concentrations（0.0001%, 0.01%, and 1%） of NFJ for a period of 24 h. In the in vivo study, old（16–17 months） male F344 rats were treated with 5 mL/kg body weight of 5%, 10% and 20% of NFJ, twice a day, by oral gavage, and lymph node lymphocytes were isolated after 60 d. Concanavalin A（Con A）-induced lymphocyte proliferation, interleukin-2（IL-2）and interferon-γ（IFN-γ） production and expression of intracellular markers, such as phosphoextracellular signal-regulated kinase（p-ERK1/2）, phospho-γ AMP response element-binding protein,phospho-protein kinase B（p-Akt）, phospho-tyrosine hydroxylase（p-TH）, phospho-nuclear factor of κ light polypeptide gene enhancer in B-cells inhibitor-α（p-IκB-α） and phospho-nuclear factor-κB（p-NF-κB p65 and p50） were examined in the lymphocytes of lymph ***： NFJ increased Con A-induced lymphocyte proliferation, IL-2 and IFN-γ production, and p-ERK1/2 expression both in vitro and in vivo. In in vivo NFJ-treated old rats, lymph node lymphocytes showed increased expression of p-TH and Akt, nitric oxide production and decreased expression of p-NF-κB p65 and ***： These results suggest that the immunostimulatory properties of NFJ are facilitated through intracellular signaling pathways involving ERK1/2, Akt and NF-κB.

关键词： Tyrosine hydroxylase Cytokines Inflammation Mitogen-activated protein kinase 1/2 Proto-oncogene proteins Nuclear factor-κB Morinda citrifolia Immunosenescence

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Visual and refractive outcomes following implantation of a new trifocal intraocular lens

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Eye and Vision 2017年第1期4卷 42-47页

作者： Michael Lawless Chris Hodge Joe Reich Lewis Levitz uday K.Bhatt Colm McAlinden Kate Roberts Timothy V.Roberts Vision Eye Institute Level 3270 Victoria Avenue ChatswoodSydneyNSW 2067Australia Sydney Medical School University of SydneySydneyNSWAustralia University of Technology SydneyNSWAustralia Vision Eye Institute MelbourneVICAustralia University Hospitals Bristol BristolUK

Background:Independence from all optical aids,and freedom from unwanted symptoms,following cataract and lens surgery remains the ultimate goal of both patient and *** development of trifocal IOL technology provides an ever-increasing range of *** purpose of our study is to understand the predictability,safety and efficacy of a new trifocal intraocular lens(IOL)following cataract or refractive lens exchange(RLE)***:This was a retrospective consecutive case series of patients undergoing cataract extraction or RLE followed by implantation of the Alcon IQ Panoptix *** and postoperative refractive and visual parameters were recorded and *** the cohort followed a normal distribution,standard parametric tests were *** t-test was used to compare the difference between target and postoperative refractive *** incidence of intraoperative and postoperative complications was also ***:The IOL was implanted in 66 eyes of 33 *** postoperative spherical equivalent(SE)refraction was-0.08±0.25 dioptres(d).This was not significantly different from the target refraction(p=0.841).Sixty-five percent of patients were within±0.25 d of the target SE refraction with 100%within±0.50 d of intended *** postoperative uncorrected distance visual acuity(UdVA)was 0.01±0.10 *** patients achieved an unaided distance acuity of 20/40 or better ***,100%saw 0.20 LogMAR or better at near without correction and 88.9%achieved this level for uncorrected intermediate visual *** intraoperative complications were *** patients complained of moderate haloes in the early postoperative ***:The AcrySof IQ Panoptix IOL provides functional uncorrected visual acuity at distance,intermediate and near *** results remain equivalent with existing trifocal IOL outcomes and provide surgeons with a further IOL alternative for the patient motivated to obtain true spectacl

关键词： Trifocal Trifocal IOL Cataract Refractive lens exchange

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A prospective randomized study to define the role of low dose continuous prophylactic antibiotics and anti-adherence agents in altering the microbial colonization related to indwelling double‐J stents

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Asian Journal of Urology 2021年第3期8卷 269-274页

作者： Kumar Madhavan Sanchit Rustagi Rahul Jena uday Pratap Singh M.S.Ansari Aneesh Srivastava Rakesh Kapoor Sanjoy Kumar Sureka department of Urology and Renal Transplantation SGPGIMSLucknowIndia

Objective:despite conflicting evidence,it is common practice to use continuous antibiotic prophylaxis(CAP)in patients with indwelling double-J(dJ)*** extracts and d-mannose have been shown to prevent colonization of the urinary *** evaluated their role in this ***:We conducted a prospective randomized study to evaluate patients with indwelling dJ stents following urological *** were randomized into three *** A(n=46)received CAP(nitrofurantoin 100 mg once daily[Od]).Group B(n=48)received cranberry extract 300 mg and d-mannose 600 mg twice daily(Bd).Group C(n=40)received no *** stents were removed between 15 days and 45 days after *** groups were compared in terms of colonization of stent and urine,stent related symptoms and febrile urinary tract infections(UTIs)during the period of indwelling stent and until 1 week after ***:In Group A,9(19.5%)patients had significant bacterial growth on the *** was 8(16.7%)in the Group B and 5(12.5%)in Group C(p-value:0.743).However,the culture positivity rate of urine specimens showed a significant difference(p-value:0.023)with Group B showing least colonization of urine compared to groups A and *** was no statistically significant difference in the frequency of stent related symptoms(p-value:0.242)or febrile UTIs(p-value:0.399)among the ***:Prophylactic agents have no role in altering bacterial growth on temporary indwelling dJ stent,stent related symptoms or febrile *** extract may reduce the colonization of urinary tract,but its clinical significance needs further evaluation.

关键词： Antibiotic Prophylaxis Stent Cranberry Infection

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Anomalous Origin of Left Coronary Artery from Main Pulmonary Artery (ALCAPA) Who Underwent Two Coronary System Repair with a Novel Technique

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Open Journal of Clinical diagnostics 2014年第3期4卷 182-191页

作者： Chandrashekhar Ponde Monika Jawanjal Kaushal Pandey uday Gandhe P.d. Hinduja National Hospital Mahim Mumbai India P.d. Hinduja National Hospital Mahim Mumbai India

We report clinical, CT, invasive coronary angiography and intra-operative findings of a symptomatic elderly man with anomalous origin of left coronary artery from pulmonary artery (ALCAPA). ALCAPA is a rare syndrome with anomalous origin of left main coronary artery (LMCA) from main pulmonary artery (MPA). Survival into adulthood is rare and our case is probably the oldest survivor who has undergone two coronary system repairs for this anomaly. The unique features of our case include: 1) Absence of “q” wave myocardial infarction on ECG;2) Absence of significant mitral regurgitation;3) demonstration of stress induced perfusion defects in nuclear imaging which as per our knowledge has been done for the first time in the literature;4) A unique technique of closing anomalous LMCA origin by a pericardial patch, sutured on the internal aspect of MPA is the hallmark of this case.

关键词： ALCAPA CT Coronary Angiography Invasive Angiography

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