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Formulation and evaluation of Albendazole microcapsules for colon delivery using chitosan

Asian Pacific Journal of Tropical Medicine 2010年第5期3卷 374-378页

作者： simi sp Saraswathi R Sankar C Krishnan PN Dilip C Ameena K Al Shifa College Of Pharmacy KizhatturPerinthalmannaKerala.Pin-679325India

Objective:To formulate and evaluate Albendazole microcapsules using chitosan,a natural polymer for colon-specific delivery for better treatment of helminthiasis,filariasis,colorectal cancer,avoiding the side ***:The Albendazole microcapsules were prepared by the use of different concentrations of sodium alginate,chitosan and hydroxypropyl methylcellulose(HPMC).The polysaccharides chitosan reacted with sodium alginate in the presence of calcium chloride to form microcapsules with a polyelectrolyte complex membrane by electrostatic interactions between the two oppositely charged *** microcapsules were then studied for entrapment efficiency,drug-polymer compatibility and surface morphology. In vitro drug release study in presence and absence of cecal content were also ***, kinetic modellings were employed to find out release ***:Albendazole loaded microspheres showd high entrapment efficiency(72.8%) and the microcapsules were free flowing,non aggregated and spherical,between 600 and 1 000μm in *** surface of microcapsules were found to be porous and *** FT-IR spectrum showed that there is no interaction between the polymer and the *** in vitro drug release study found to be affected by change in chitosan,sodium alginate and HPMC *** microcapsules with 2.5% sodium alginate and 0.4% chitosan shown minimum release in gastrointestinal simulated condition but shows maximum drug release at the end of 24th hour in presence of cecal *** rate of drug release follows Korsmeyer-peppas model that was the drug release is by diffusion and ***:The study reveals that Albendazole loaded chitosanalginate based microsphere can be used effectively for the colon targeting.

关键词： Colon drug delivery Albendazole Chitosan Sodium alginate Microcapsule

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Isolation of the mucilages from Hibiscus rosasinensis *** Okra(Abelmoschus esculentus linn.) and studies of the binding effects of the mucilages

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Asian Pacific Journal of Tropical Medicine 2010年第7期3卷 539-543页

作者： Ameena K Dilip C Saraswathi R Krishnan PN Sankar C simi sp Al Shifa College of Pharmacy KizhatturPerinthalmanna.Kerala679325India

Objective:To isolate and evaluate comparatively the binding efficacy of the mucilages obtained from the plants of Hibiscus rosasinensis and Okra(Abelmoschus esculentus).Methods:Extraction of mucilages from the leaves of Hibiscus and pods of Okra(Ladies finger) was carried out by a cold maceration *** extracted mucilages were subjected to various physicochemical properties for its suitability as an excipient in the formulation of tablet dosage *** concentrations(10,8,5,2 and 1%w/v) of binder solutions of Hibiscus and Okra were used for the formulation of tablets and the formulated tablets were evaluated by studying the standard parameters like diameter,thickness,weight variation,hardness,friability,disintegration and in vitro *** studies of the formulated tablets were conducted for four weeks. Results:The formulated tablets prepared using the mucilages of both Hibiscus and Okra had good *** in vitro drug release profile of the tablets prepared using Okra mucilage had an optimum of 90%at a mucilage concentration of 1%w/v concentration mucilage itself within 4 ***:According to the observations,the lower concentration levels of Okra can be used as an alternative binder to *** higher concentration levels of Okra mucilage show a slow and sustained release,and can be considered as an alternative natural excipient in the modified drug delivery *** the same time,the above natural excipient of Hibiscus mucilage could be used as a platform for prolonged release if its binder concentrations are increased.

关键词： Formulation Hibiscus Tablets

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Ground target localization of unmanned aerial vehicle based on scene matching

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High Technology Letters 2024年第3期30卷 231-243页

作者： ZHANG Yan CHEN Yukun HUANG He TANG simi LI Zhi Beijing Yansou Technology Co. Ltd.Beijing 100085P.R.China The 15th Research Institute of China Electronics Technology Group Corporation Beijing 100083P.R.China

In order to improve target localization precision,accuracy,execution efficiency,and application range of the unmanned aerial vehicle(UAV)based on scene matching,a ground target localization method for unmanned aerial vehicle based on scene matching(GTLUAVSM)is *** sugges-ted approach entails completing scene matching through a feature matching ***,multi-sensor registration is optimized by robust estimation based on homologous ***,basemap generation and model solution are utilized to improve basemap correspondence and accom-plish aerial image *** evidence and experimental verification demonstrate that GTLUAVSM can improve localization accuracy,speed,and precision while minimizing reliance on task equipment.

关键词： scene matching basemap adjustment feature registration random sample con-sensus(RANSAC) unmanned aerial vehicle(UAV)

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Genome-wide identification,characterization and functional prediction of the SRS gene family in sesame(Sesamum indicum L.)

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Oil Crop Science 2024年第2期9卷 69-80页

作者： Farjana Afroz Susmi Tasmina Islam simi Md Nahid Hasan Md Abdur Rahim Department of Genetics and Plant Breeding Sher-e-Bangla Agricultural UniversityDhaka1207Bangladesh

Sesame(Sesamum indicum L.)is an ancient oilseed crop of the Pedaliaceae family with high oil content and potential health *** RELATED SEQUENCE(SRS)proteins are the transcription factors(TFs)specific to plants that contain RING-like zinc finger domain and are associated with the regulation of several physiological and biochemical *** also play vital roles in plant growth and development such as root formation,leaf development,floral development,hormone biosynthesis,signal transduction,and biotic and abiotic stress ***,the SRS gene family was not reported in sesame *** this study,identification,molecular characterization,phylogenetic relationship,cis-acting regulatory elements,protein-protein interaction,syntenic relationship,duplication events and expression pattern of SRS genes were analyzed in *** identified total six SiSRS genes on seven different linkage groups in the *** genome by comparing with the other species,including the model plant Arabidopsis *** SiSRS genes showed variation in their structure like2–5 exons and 1–4 *** other species,SiSRS proteins also contained‘RING-like zinc finger'and‘LRP1'***,the SiSRS genes were clustered into subclasses via phylogenetic analysis with proteins of ***,***,and some other plant *** cis-acting regulatory elements analysis revealed that the promoter region of SiSRS4(SIN_1011561)showed the highest 13 and 16 elements for light-and phytohormone-responses whereas,SiSRS1(SIN_1015187)showed the highest 15 elements for *** ABREs,or ABA-responsive elements,were found in a maximum of 8 copies in the SiSRS3(SIN 1009100).Moreover,the available RNA-seq based expression of SiSRS genes revealed variation in expression patterns between stress-treated and non-treated samples,especially in drought and salinity conditions *** SiSRS genes like SiSRS1(SIN_1015187)and SiSRS5(SIN_1021065),also exhibited variabl

关键词： SiSRS gene family SHI Transcription factor Characterization Sesamum indicum

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过硫酸铵氧化耦合过渡金属氧化物改性炭基催化剂低温SCR性能增强机制研究

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燃料化学学报（中英文） 2024年第8期52卷 1140-1148页

作者：肖岭黄妍乔淑芳赵令葵李思密湘潭大学环境与资源学院湖南湘潭411105 株洲市生态环境局湖南株洲412000

本工作中利用过硫酸铵氧化耦合过渡金属氧化物改性制备V/OAC、Fe/OAC、Mn/OAC、Cu/OAC炭基催化剂,并通过催化活性测试和物理吸附-脱附、FT-IR、XPS、NH3-TPD、H2-TPR、EPR等表征手段探究改性炭基催化剂的低温SCR性能增强机制。结果表明... 详细信息

本工作中利用过硫酸铵氧化耦合过渡金属氧化物改性制备V/OAC、Fe/OAC、Mn/OAC、Cu/OAC炭基催化剂,并通过催化活性测试和物理吸附-脱附、FT-IR、XPS、NH3-TPD、H2-TPR、EPR等表征手段探究改性炭基催化剂的低温SCR性能增强机制。结果表明,过硫酸铵氧化可向活性炭载体表面引入大量酸性含氧官能团,促进过渡金属氧化物中的氧空位形成,从而提升炭基催化剂的表面酸度和氧化还原性能,进而提升了炭基催化剂低温NH3-SCR性能。本工作发现,过硫酸铵氧化可诱导过渡金属元素(V、Fe、Mn、Cu)的低价态形成。因此,过硫酸铵氧化改性后,活性组分中低价态金属利于NH3-SCR反应的V/OAC、Fe/OAC催化剂性能提升显著,VOx/OAC和FeOx/OAC催化剂在100℃下的NO转化率分别从18.2%提升到34.8%和从34.2%提升到55.6%;而活性组分中高价态金属有利NH3-SCR反应的Mn/OAC和Cu/OAC催化剂性能提升有限,100℃下的NO转化率仅从61.4%提升到70.4%和61.3%提升到69.7%。本工作总结了过硫酸铵氧化改性对炭基催化剂表面金属价态的调控作用,有助于深入认识过硫酸铵氧化改性对炭基催化剂物化性质的调控规律,为高效炭基脱硝催化剂的开发提供指导和参考。

关键词： NH3-SCR 炭基催化剂过渡金属金属价态

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A simple method of tuning series cascade controllers for unstable systems

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控制理论与应用（英文版） 2013年第4期11卷 661-667页

作者： simi SANTOSH M.CHIDAMBARAM Department of Chemical Engineering Indian Institute of Technology Madras

A simple method is proposed to design P/PI controllers for a series cascade control system for unstable first order plus time-delay （FOPTD） systems. In this paper, the controller design for unstable FOPTD systems cascaded in series with stable/unstable FOPTD systems is considered. The proposed method is based on equating the coefficients of corresponding powers of s and s2 in the numerator to α1 and α2 times those of the denominator of the closed-loop transfer function for a servo problem. The open loop system consists of an unstable FOPTD system cascaded in series with a stable/unstable FOPTD system. Only two tuning parameters （α1 and α2） are required for the design of controllers. The closed-loop performances are evaluated for both the servo and regulatory problems and the performances are found to be better than that of the well established synthesis method. The robustness for uncertainty in the model parameters is studied and compared with that of the controllers designed by the synthesis method.

关键词： Cascade control Time-delay process PI controller P controller FOPTD model Tuning

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Near horizon OTT black hole asymptotic symmetries and soft hair

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Chinese Physics C 2019年第1期43卷 84-90页

作者： B.Cvetkovi? D.simi? Institute of Physics University of Belgrade

We study the near horizon geometry of both static and stationary extremal Oliva Tempo Troncoso(OTT)black holes. For each of these cases, a set of consistent asymptotic conditions is introduced. The canonical generator for the static configuration is shown to be regular. For the rotating OTT black hole, the asymptotic symmetry is described by the time reparametrization, the chiral Virasoro and centrally extended u(1) Kac-Moody algebras.

关键词： near horizon geometry OTT black hole 3D gravity

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Peltzman effect and resurgence of COVID-19 in India

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Asian Pacific Journal of Tropical Medicine 2021年第5期14卷 193-194页

作者： simi Thankappan Sherin Nedumpillil Oral Medicine&Radiology specialist KochiKerala India Department of Oral Pathology&Microbiology Govt.Dental CollegeDibrugarhAssam India

With a daily rise of over 400000 cases,the deadly COVID-19 wave has gripped India with grim ***’s test positivity rate(TPR)was 16%with 1356133 tests[1,2](Figure 1).The number is still steeply climbing and has burdened the already overwhelmed health system.A frightening situation of lack of availability of hospital beds and critical care units has been witnessed in several states in recent days.

关键词： Figure India COV

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多层螺旋CT血管成像动态图像后处理对脑血管畸形病变的诊断价值研讨

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世界复合医学 2024年第1期10卷 26-29页

作者：王丽周田刘斯咪聊城市人民医院脑科影像科山东聊城252000

目的研究多层螺旋CT血管成像动态图像后处理运用于脑血管畸形病变患者中的效果。方法随机选取2020年10月—2023年10月聊城市人民医院接诊的70例疑似脑血管畸形病变患者为研究对象,将数字减影血管造影结果作为诊断金标准,并且提供多层螺... 详细信息

目的研究多层螺旋CT血管成像动态图像后处理运用于脑血管畸形病变患者中的效果。方法随机选取2020年10月—2023年10月聊城市人民医院接诊的70例疑似脑血管畸形病变患者为研究对象,将数字减影血管造影结果作为诊断金标准,并且提供多层螺旋CT血管成像动态图像后处理,应用CT多平面重组、三维容积漫游及联合诊断分析诊断效能。结果数字减影血管造影阳性检出率为48.57%,CT多平面重组诊断阳性检出率为42.86%,三维容积漫游诊断阳性检出率为44.29%,联合检查阳性检出率为51.43%。CT多平面重组诊断、三维容积漫游诊断的灵敏度、特异度、准确度相比,差异无统计学意义(P均>0.05)。联合诊断的灵敏度、准确度显著高于CT多平面重组诊断,差异有统计学意义(P均0.05)。结论多层螺旋CT血管成像动态图像后处理中,CT多平面重组联合三维容积漫游诊断运用于脑血管畸形病变患者中具有较高的诊断效能,诊断价值高。

关键词：脑血管畸形病变多层螺旋CT血管成像动态

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Effect of contact geometry on the friction of acrylamide hydrogels with different surface structures

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Friction 2022年第3期10卷 360-373页

作者： Wenrui LIU Rok simiČ Yuhong LIU Nicholas DspENCER State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China Laboratory for Surface Science and Technology Department of MaterialsETH Zurich8093 ZurichSwitzerland

Polyacrylamide(PAAm)hydrogels with brush-covered or crosslinked surfaces were produced and their tribological behavior was studied over a wide range of sliding speeds for two different contact geometries:sphere-on-flat and *** of the contact geometry,the brushy hydrogel surfaces displayed up to an order of magnitude lower coefficients of frictionμ(COF)compared to the crosslinked surfaces,even achieving superlubricity(μsphere showed a lower coefficient of friction than a flat hydrogel pin at a similar contact pressure over the entire range of sliding ***,after normalizing the friction force by the contact area,the shear stress of hydrogels with either crosslinked or brushy surfaces was found to be similar for both contact geometries at low speeds,indicating that hydrogel friction is unaffected by the contact geometry at these *** high sliding speeds,the shear stress was found to be lower for a sphere-on-flat configuration compared to a flat-pin-on-flat *** can be attributed to the larger equivalent hydrodynamic thickness due to the convergent inlet zone ahead of the sphere-on-flat contact,which presumably enhances the water supply in the contact,promotes rehydration,and thus reduces the friction at high sliding speeds compared to that measured for the flat-pin-on-flat contact.

关键词： hydrogels contact geometry aqueous lubrication friction coefficient(COF) superlubricity

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