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mussel-inspired sulfated hyaluronan cryogel patch with antioxidant, anti-inflammatory, and drug-loading properties for multifunctional wound adhesives

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Bioactive materials 2024年第10期40卷 582-596页

作者： Wonmoon Song Young Hwan Choi Young Gi moon Changyub Lee m.nivedhitha sundaram Nathaniel S.Hwang School of Chemical and Biological Engineering Institute for Chemical ProcessesSeoul National UniversitySeoul08826Republic of Korea Interdisciplinary Program in Bioengineering Seoul National UniversitySeoul08826Republic of Korea Bio-mAX/N-Bio Institute Institute of BioEngineeringSeoul National UniversitySeoul08826Republic of Korea Division of Pediatric Cardiac Surgery Department of SurgeryJohns Hopkins School of MedicineBaltimoreMDUSA Institute of Engineering Research Seoul National UniversitySeoul08826Republic of Korea

Wounds, characterized by the disruption of the continuity of body tissues resulting from external trauma,manifest in diverse types and locations. Although numerous wound dressings are available for various woundscenarios, it remains challenging to find an integrative wound dressing capable of addressing diverse woundsituations. We focused on utilizing sulfated hyaluronan (sHA), known for its anti-inflammatory properties andcapacity to load cationic drugs. By conjugating catechol groups to sHA (sHA-CA), we achieved several advantagesin wound healing: 1) Fabrication of patches through crosslinking with catechol-modified high-molecularweighthyaluronan (HA(HmW)-CA), 2) Adhesiveness that enabled stable localization, 3) Radical scavenging thatcould synergize with the immunomodulation of sHA. The sHA-CA patches demonstrated therapeutic efficacy inthree distinct murine wound models: diabetic wound, hepatic hemorrhage, and post-surgical adhesion. Collectively,these findings underscore the potential of the sHA-CA patch as a promising candidate for the nextgenerationwound dressing.

关键词： Adhesive patch Anti-inflammation Sulfated hyaluronic acid Post-surgical adhesion Diabetic wound Hemostasis

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Liquid vaporization under thermodynamic phase non-equilibrium condition at the gas-liquid interface

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Science China(Technological Sciences) 2020年第12期63卷 2649-2656页

作者： WANG XingJian LAFON Patrick sundaram Dilip YANG Vigor Department of mechanical and Civil Engineering Florida Institute of TechnologyMelbourneFlorida 32901USA Department of mechanical and Nuclear Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA School of Aerospace Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

Liquid vaporization under thermodynamic phase non-equilibrium condition at the gas-liquid interface is investigated over a wide range of fluid state typical of many liquid-fueled energy conversion systems. The validity of the phase-equilibrium assumption commonly used in the existing study of liquid vaporization is examined using molecular dynamics theories. The interfacial mass flow rates on both sides of the liquid surface are compared to the net vaporization rate through an order-of-magnitude *** indicated that the phase-equilibrium assumption holds valid at relatively high pressures and low temperatures,and for droplets with relatively large initial diameters(for example,larger than 10 μm for vaporizing oxygen droplets in gaseous hydrogen in the pressure range from 10 atm to the oxygen critical state). Droplet vaporization under superheated conditions is also explored using classical binary homogeneous nucleation theory,in conjunction with a real-fluid equation of state. It is found that the bubble nucleation rate is very sensitive to changes in saturation ratio and pressure;it increases by several orders of magnitude when either the saturation ratio or the pressure is slightly increased. The kinetic limit of saturation ratio decreases with increasing pressure,leading to reduced difference between saturation and superheat conditions. As a result,the influence of nonequilibrium conditions on droplet vaporization is lower at a higher pressure.

关键词： liquid vaporization droplet vaporization superheated vaporization thermodynamic phase equilibrium thermodynamic phase non-equilibrium vapor nucleation

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Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized multi Gaussian Beam

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Chinese Physics Letters 2016年第6期33卷 29-32页

作者： C.m.sundaram K.Prabakaran P.m.Anbarasan K.B.Rajesh A.m.musthafa Department of Physics Periyar University Department of Physics Mahendra Arts and Science College(Autonomous) Department of Physics Chikkanna Government Arts College Department of General Studies(Physics Group) Jubail University College(Male Branch)Royal Commission of Jubail

The intensity distribution in the focal region of a high-NA lens for the incident azimuthally polarized multi Gaussian beam transmitted through a multi belt spiral phase hologram is studied on the basis of the vector diffraction theory. Here we report a new method used to generate a needle of transversely polarized light beam with sub diffraction beam size of 0.366A that propagates without divergence over a long distance of about 22A in free space. We also expect that such a light needle of transversely polarized beam may find its applications in utilizing optical materials or instruments responsive to the transversal field only.

关键词： of on it for Creation of Super Long Transversely Polarized Optical Needle Using Azimuthally Polarized multi Gaussian Beam in that is

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Experimental Studies on the Thermal Performance of a Parabolic Dish Solar Receiver with the Heat Transfer Fluids SiC+ Water Nano Fluid and Water

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Journal of Thermal Science 2017年第3期26卷 263-272页

作者： D.R.Rajendran E.Ganapathy sundaram P.Jawahar Department of mechanical Engineering Adhiparasakthi Engineering CollegeMelmaruvahur-603319Tamil NaduIndia Department of mechanical Engineering Velammal Engineering CollegeChermai-600066Tamil NaduIndia Department of Production Engineering Velammal Engineering CollegeChennai-600066Tamil NaduIndia

An experimental investigation has been carried out with aa point focusing dish reflector of 12 square meters aperture area, exposed to the average direct normal irradiations of 810 W/m^2. This work focuses on enhancinge the energy and exergy efficiencies of the cavity receiver by minimizing the temperature difference between the wall and heat transfer fluids. Two heat transfer fluids Water and SiC + water nano fluid have been prepared from 50 nm particle size and 1% of volume fraction, and experimented separately for the flow rates of 0.2 lpm to 0.6 lpm with an interval of 0.1 lpm. The enhanced thermal conductivity of nano fluid is 0.800115 W/mK with the k_(eff)/k_b ratio of 1.1759 determined by using the Koo and Kleinstreuer correlation. The maximum attained energy and exergy efficiencies are 29.14% and 24.82% for water, and 32.91% and 39.83% for SiC+water nano fluid. The nano fluid exhibits enhanced energy and exergy efficiency of 12.94% and 60.48% than that of water at the flow rate of 0.5 lpm. The result shows that the system with SiC+Water produces higher exergy efficiency as compared to energy efficiency; in the case of water alone, the energy efficiency is higher than exergy efficiency.

关键词： Direct Normal Irradiation cavity receiver heat transfer fluids nano fluid exergy factor

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mutual Self‑Regulation of d‑Electrons of Single Atoms and Adjacent Nanoparticles for Bifunctional Oxygen Electrocatalysis and Rechargeable Zinc‑Air Batteries

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Nano-micro Letters 2023年第4期15卷 40-57页

作者： sundaram Chandrasekaran Rong Hu Lei Yao Lijun Sui Yongping Liu Amor Abdelkader Yongliang Li Xiangzhong Ren Libo Deng College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060People’s Republic of China College of Chemistry and Bioengineering Guilin University of TechnologyGuilin 541004People’s Republic of China Shenzhen Key Laboratory of Special Functional materials Shenzhen Engineering Laboratory for Advanced Technology of CeramicsCollege of Materials Science and EngineeringGuangdong Research Center for Interfacial Engineering of Functional MaterialsShenzhen UniversityShenzhen 518060People’s Republic of China Shanghai Key Laboratory for R&D and Application of metallic Functional materials Institute of New Energy for VehiclesSchool of Materials Science and EngineeringTongji UniversityShanghai 201804People’s Republic of China Department of Design and Engineering Faculty of Science&TechnologyBournemouth UniversityPoole BH125BBDorsetUK

Rechargeable zinc-air batteries(ZABs)are a promising energy conversion device,which rely critically on electrocatalysts to accelerate their rate-determining reactions such as oxygen reduction(ORR)and oxygen evolution reactions(OER).Herein,we fabricate a range of bifunctional m-N-C(metal-nitrogen-carbon)catalysts containing m-Nx coordination sites and m/mxC nanoparticles(m=Co,Fe,and Cu)using a new class ofγ-cyclodextrin(CD)based metal-organic framework as the *** the two types of active sites interacting with each other in the catalysts,the obtained Fe@C-FeNC and Co@C-CoNC display superior alkaline ORR activity in terms of low half-wave(E1/2)potential(~0.917 and 0.906 V,respectively),which are higher than Cu@C-CuNC(~0.829 V)and the commercial Pt/C(~0.861 V).As a bifunctional electrocatalyst,the Co@C-CoNC exhibits the best performance,showing a bifunctional ORR/OER overpotential(ΔE)of~0.732 V,which is much lower than that of Fe@C-FeNC(~0.831 V)and Cu@C-CuNC(~1.411 V),as well as most of the robust bifunctional electrocatalysts reported to *** X-ray absorption spectroscopy and density functional theory simulations reveal that the strong electronic correlation between metallic Co nanoparticles and the atomic Co-N4 sites in the Co@C-CoNC catalyst can increase the d-electron density near the Fermi level and thus effectively optimize the adsorption/desorption of intermediates in ORR/OER,resulting in an enhanced bifunctional electrocatalytic *** Co@C-CoNC-based rechargeable ZAB exhibited a maximum power density of 162.80 mW cm^(−2) at 270.30 mA cm^(−2),higher than the combination of commercial Pt/C+RuO2(~158.90 mW cm^(−2) at 265.80 mA cm^(−2))*** the galvanostatic discharge at 10 mA cm^(−2),the ZAB delivered an almost stable discharge voltage of 1.2 V for~140 h,signifying the virtue of excellent bifunctional ORR/OER electrocatalytic activity.

关键词： Cyclodextrin CD-mOF Single-atom catalyst ORR/OER Zinc-air battery

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水环境中RH-5992液相色谱分析

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环境科学 1996年第5期17卷 62-64,71页

作者：朱九生 K.m.S.sundaram R.Nott 山西省农科院植物保护研究所太原030031 加拿大林业部森林害虫治理研究所

为评价RH-5992在环境中的分布与结局,介绍了一种该化合物在湖水、淤泥、鱼、宽叶香蒲草和驴蹄草中的残留量分析方法.分析过程包括溶剂的提取、液液分配、柱层析净化和液相色谱分析.分析物采用二极管阵列式(diode-array)紫外检测器进行检... 详细信息

为评价RH-5992在环境中的分布与结局,介绍了一种该化合物在湖水、淤泥、鱼、宽叶香蒲草和驴蹄草中的残留量分析方法.分析过程包括溶剂的提取、液液分配、柱层析净化和液相色谱分析.分析物采用二极管阵列式(diode-array)紫外检测器进行检测,柱型为RP-8,流动相为乙腈、二氧六环和水.方法平均回收率为85%—98%,变异系数为6%—9%,最低检出浓度除湖水为0.050 μg/L外,其它几种样品为0.009—0.028 mg/kg。

关键词： RH-5992 水环境残留分析高效液相色谱

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Eastern gray squirrels are consistent shoppers of seed traits:insights from discrete choice experiments

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Integrative Zoology 2018年第3期13卷 280-296页

作者： mekala sundaram Nathanael I.LICHTI Nicole J.Olynk WIDmAR Robert K.SWIHART Department of Forestry and Natural Resources Purdue UniversityWest LafayetteIndianaUSA Department of Agricultural Economics Purdue UniversityWest LafayetteIndianaUSA

Seeds of many hardwood trees are dispersed by scatter-hoarding rodents,and this process is often mediated by the traits of *** numerous studies have linked seed traits to seed preference by rodents,little is known about how rodents forage for seeds when multiple desirable and undesirable seed traits are available ***,we adopt a novel method of designing choice experiments to study how eastern gray squirrels(Sciurus carolinensis)select for 6 traits(caloric value,protein content,tannin concentration,kernel mass,dormancy period and toughness of shell)among *** n=426 seed-pair presentations,we found that squirrels preferentially consumed seeds with short dormancy or tougher shells,and preferentially cached seeds with larger kernel mass,tougher shells and higher tannin *** incorporating random effects,we found that squirrels exhibited consistent preferences for seed traits,which is likely due to the fitness consequences associated with maintaining cached ***,we found that squirrels were willing to trade between multiple traits when caching seeds,which likely results in more seed species being cached in the ***,our approach allowed us to compute the relative values of different seed traits to squirrels,despite covariance among studied traits across seed *** addition,by investigating how squirrels trade among different seed traits,important insights can be gleaned into behavioral mechanisms underlying seed caching(and,thus,seed survival)dynamics as well as evolutionary strategies adopted by plants to attract seed *** describe how discrete choice experiments can be used to study resource selection in other ecological systems.

关键词： cached resources discrete choice experiment resource selection trade-offs trait-dependent

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Genetic Improvement of Rice for Bacterial Blight Resistance:Present Status and Future Prospects

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Rice science 2022年第2期29卷 118-132页

作者： R.ABDUL FIYAZ D.SHIVANI K.CHAITHANYA K.mOUNIKA m.CHIRANJEEVI G.S.LAHA B.C.VIRAKTAmATH L.V.SUBBA RAO R.m.sundaram ICAR-Indian Institute of Rice Research RajendranagarHyderabad 500030India Professor Jayashankar Telangana State Agricultural University RajendranagarHyderabad 500030India

The production and productivity of rice has been challenged due to biotic and abiotic *** blight(BB)disease,caused by Xanthomonas oryzae ***,is one of the important biotic stress factors,which reduces rice production by 20%-50%.The deployment of host plant resistance is the most preferred strategy for management of BB disease,and breeding disease resistant varieties remains a very economical and effective ***,it is difficult to develop rice varieties with durable broad-spectrum resistance against BB using conventional approaches *** biotechnological tools,particularly the deployment of molecular markers,have facilitated the cloning,characterization and introgression of BB resistance genes into elite *** least 46 BB resistance genes have been identified and mapped from diverse sources till *** these,11 genes have been cloned and ***-assisted breeding remains the most efficient approach to improve BB resistance by introducing two or more resistance genes into target *** the identified genes,xa5,xa13 and Xa21 are being widely used in marker-assisted breeding and more than 70 rice varieties or hybrid rice parental lines have been improved for their BB resistance alone or in combination with genes/QTLs conferring tolerance to other *** review the developments related to identification and utilization of various resistance genes to develop BB resistant rice varieties through marker-assisted breeding.

关键词： rice bacterial blight resistance gene marker-assisted breeding gene pyramiding

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Evaluation of safety profile of black shilajit after 91 days repeated administration in rats

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Asian Pacific Journal of Tropical Biomedicine 2012年第3期2卷 210-214页

作者： Velmurugan C Vivek B Wilson E Bharathi T sundaram T Department of Pharmacology Sri Krishna Chaithanya College of Pharmacy Department of Pharmacology Sri K.V College of PharmacyM.G RoadChickballapurKarnataka SRF National Institute of Indian Medical HeritageHyderabad Department of Pharmaceutical Biotechnology Sri Krishna Chaithanya College of Pharmacy Department of Pharmaceutics Sri Krishna Chaithanya College of pharmacy

Objective:To evaluate the safety of shilajit by 91 days repeated administration in different dose levels in ***:In this study the albino rats were divided into four groups. Group Ⅰ received vehicle and group Ⅱ,Ⅲ and Ⅳ received 500,2500 and 5000 mg/kg of shilajit, *** animals were sacrificed and subjected to histopathology and iron was estimated by flame atomic absorption spectroscopy and graphite ***:The result showed that there were no significant changes in iron level of treated groups when compared with control except liver(5000 mg/kg) and histological slides of all organs revealed normal except negligible changes in liver and intestine with the highest dose of *** weight of all organs was normal when compared with ***:The result suggests that black shilajit,an Ayurvedic formulation,is safe for long term use as a dietary supplement for a number of disoniers like iron deficiency anaemia.

关键词： Shilajit Graphite furnace Histopathology Flame atomic absorption spectroscopy

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mechanisms underlying detection of seed dormancy by a scatter-hoarding rodent

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Integrative Zoology 2020年第2期15卷 89-102页

作者： mekala sundaram Ashley E.HIGDON Karl V.WOOD Connie C.BONHAm Robert K.SWIHART Department of Forestry and Natural Resources Purdue UniversityWest LafayetteUSA Department of Chemistry Purdue UniversityWest LafayetteUSA Department of Biochemistry Purdue UniversityWest LafayetteUSA Department of Geological Sciences Stanford UniversityStanfordCaliforniaUSA

The mechanism underlying detection of seed dormancy by scatter-hoarding rodents is unclear,although previous work suggests that the pericarp plays an important role in signaling dormancy *** gray squirrels(Sciurus carolinensis)consume early germinating seeds as they are more likely to perish immediately,whereas dormant seeds tend to be *** examine the mechanisms underlying dormancy detection,we characterized physical and chemical differences between germinating and dormant pericarps of northern red oak(Quercus rubra),American chestnut(Castanea dentata)and the BC3 hybrid of Chinese chestnut and American chestnut(Castanea mollissima×***)using scanning electron microscopy and gas chromatography-mass spec*** found that,as seeds break dormancy,the wax layer on the pericarp degrades and is accompanied by the escape of lower molecular weight kernel compounds or lipid metabolism *** field experiments showed that squirrels were 4-8 times more likely to consume seeds that were altered to remove pericarp wax coating or that were sprayed with seed *** argue that dormancy detection by scatter-hoarding rodents is a complex process involving physical cues such as loss of pericarp wax and chemical cues such as emission of olfactory cues.

关键词： cache pericarp wax scatter-hoarding seed consumption

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