检索结果-南通市图书馆

In situ formation of bimetallic FeNi nanoparticles on sand through green technology:Application for tetracycline removal

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第1期14卷 185-197页

作者： ravikumar KVG Debayan Ghosh M rudula Pulimi Chandrasekaran Natarajan Amitava Mukherjee Centre for Nanobiotechnology VITVelloreTamil NaduIndia

In this study,FeNi nanoparticles were green synthesized using Punica granatum(pomegranate)peel extract,and these nanoparticles were also formed in situ over quartz sand(GS-FeNi)for removal of tetracycline(TC).Under the optimized operating conditions,(GS-FeNi concentration:1.5%w/v;concentration of TC:20 mg/l;interaction period:180 min),99±0.2%TC removal was achieved in the batch reactor The removaT capacity was 181±1 mg/g.A detailed characterization of the sorbent and the solution before and after the interaction revealed that the removal mechanism(s)involved both the sorption and degradation of *** reusability of reactant was assessed for four cycles of operation,and 77±4%of TC removal was obtained in the *** judge the environmental sustainability of the process,residual toxicity assay of the interacted TC solution was performed with indicator bacteria(Bacillus and Pseudomonas)and algae(Chlorella sp.),which confirmed a substantial decrease in the *** continuous column studies were undertaken in the packed bed reactors using *** the optimized conditions,quite high removal efficiency(978±5 mg/g)was obtained in the *** application of GS-FeNi for antibiotic removal was further evaluated in lake water,tap water,and ground water spiked with TC,and the removal capacity achieved was found to be 781±5,712±5,and 687±3 mg/g,*** work can pave the way for treatment of antibiotics and other pollutants in the reactors using novel green composites prepared from fruit wastes.

关键词： GS-FeNi nanoparticles Tetracycline removal Re-usability Residual toxicity Column studies

Hepatoprotective and antioxidant properties of marine halophyte luminetzera racemosa bark extract in CCl_4 induced hepatotoxicity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第6期4卷 462-465页

作者： Murugesan Gnanadesigan Sundaram ravikumar Samuel Jacob Inbaneson School of Marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi-623409TamilnaduIndia

Objective:To identify the hepatoprotective and antioxidant activity of luminetzera racemosa （l racemosa）bark ***:Wistar albino rats were divided into 6 groups:Group 1 served as control;Group 2 served as hepatotoxin（CCl4 treated） group;Group 3 served as positive control（Silymarin） treated groups;Group 4,5 and 6 served as（100,200 and 300 mg/kg bw p.o.） l racemosa bark extract treated ***,in vitro antioxidant indexes,including DPPH, hydroxyl radical scavenging activity（HRSA）,NO,ferric reducing antioxidant power（FRAP）,lipid hydroperoxide（lPO） and super oxide dismutase（SOD） were also analyzed in the bark extract. Results:The results suggested that,the level of serum glutamate oxyloacetic transaminase（SCOT）, serum glutamic pyruvic transaminase（SGPT）,alkaline phosphatise（AlP）,bilurubin,cholesterol, sugar and lactate dehydrogenase（lDH） were significantly（P<0.05） increased in hepatotoxin treated rats when compared with the control ***,the maximum reduction of SGOT[（225.36±13.65） IU/l],SGPT[（96.85±17.36） IU/l],AlP[（315.37±17.16） IU/l],bilirubin[（2.97±0.46） mg/dl], cholesterol[（163.73±17.54） mg/dl],sugar[（127.35±27.35） mg/dl]and lDH[（1 784.00±268.36） IU/l] were observed with 300 mg/kg bw of bark extract treated *** scores showed that,no visible changes were observed with high dose（300 mg/kg bw） of bark extract treated rats except mild fatty *** in vitro antioxidant assays showed that,the IC50 values were observed as（44.17±6.87）μ/ml,（42.45±2.81）μg/ml,（62.37±3.98）μg/ml,（54.24±3.09）μg/ml, （87.25±5.90）μg/ml and（71.54±5.42）μg/ml for ***,NO,FRAP,lPO and SOD radical scavenging activities,***:The hepatoprotective and antioxidant activities of the bark extract might be to the presence of unique chemical classes such as flavonoids, alkaloids and polyphenols.

关键词： Antioxidant Hepatoprotective Histopathology Mangroves

In Vitro Free Radical Scavenging Activity of Ethanolic Extract of the Whole Plant of Evolvulus Alsinoides(l.) l.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2015年第6期21卷 453-458页

作者： Duraisamy Gomathi Ganesan ravikumar Manokaran Kalaiselvi Balasubramaniam Vidya Chandrasekar Uma Department of Biochemistry Karpagam University

Objective： To identify the free radical scavenging activity of ethanolic extract of Evolvulus alsinoides. Methods： The free radical scavenging activity was evaluated by in vitro methods like reducing power assay, total antioxidant activity, 2,2-diphenyl-l-picrylhydrazyl （DPPH） reduction, superoxide radical scavenging activity, 2,2＇-azinobis-（3-ethylbenzothiazoline-6-sulfonic acid）（ABTS＊） scavenging activity, hydroxyl radical scavenging assay, and nitric oxide radical scavenging assay, which were studied by using ascorbic acid as standard. Results： The extract showed significant activities in all antioxidant assays compared with the reference antioxidant ascorbic acid. The total antioxidant activity as well as the reducing power was also found to increase in a dose-dependent manner. Conclusion： Evolvulus alsinoides may act as a chemopreventive agent, providing antioxidant properties and offering effective protection from free radicals.

关键词： Evolvulus alsinoides ethanolic extract total antioxidant reducing power ascorbic acid convolvulaceae

Hepatoprotective and antioxidant activity of a mangrove plant lumnitzera racemosa

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2011年第5期1卷 348-352页

作者： Sundaram ravikumar Murugesan Gnanadesigan chool of Marine Sciences Department of Oceanography and Coastal Area Studies.Alagappa University

Objective:To identify the hepatoprotective and in vitro antioxidant activity of lumnitzera racemosa(***) leaf ***:Animals in Group 1 served as vehicle control. Group 2 served as hepatotoxin(CCl_4 treated) *** 3 served as positive control(Silyntarin) group,and Group 4.S and ft served as(73,150 and 300 nig/kg bw p.o.)*** leaf extract treated ***,in vitro antioxidant DPPH,hydroxyl radical scavenging activity(HRSA),NO,ferric reducing antioxidant power(FRAP),lipid hydroperoxide(lPO) and super oxide dismutase(SOD) were also analyzed for the leaf ***:The levels of the serum parameters such as serum glutamic oxaloacetic transaminase(SGOT).serum glutamic pyruvic transaminase(SGPT).alkaline phosphatase(AlP),bilirubin,cholesterol(CHl).sugar and lactate dehydrogenase(lDH) were significantly increased in COl_4 treated rats when compared with the control group(Pleaf extract treated rats showed maximum reduction of SGOT[(210.16±19.63)IU/l].SGPT[(82.37±13.87) IU/l].AlP[(197.63±23.4.3)IU/l],bilurubilt[(2.13 ±0.84) mg/dl].cholesterol[(163.83± 13.63) mg/dl].sugar[(93.00±7.63) mg/dl]and lDH[(1134.00) ±285.00)IU/l]were observed with the high dose(300 mg/kg bw) of leaf extract treated rats. Histopathological scores showed that,no visible changes were observed with high dose(300 mg/ kgbw) of leaf extract treated rats except few mild *** IC_(50) values were observed as(56.37 ±4.87)μg/ml,(57.68±1.98) μg/ml,(64.15±2.90)μg/ml,(61.94±3.98)μg/ml,(94.53± 1.68) μg/ml and(69.7±2.65)μg/ml for DPPH,HRSA,NO,FRAP,lPO and SOl) radical scavenging activities, ***:In conclusion,the hepatoprotective effect of the *** leaf extract might be due to the presence of phenolic groups,terpenoids and alkaloids and in vitro antioxidant properties.

关键词： Antioxidant CCl_4 Histopathology Mangroves Hepatoprotective activity lumnitzera racemosa Histopathological Phenolic Alkaloid Antioxidant property Hepatoprotective Radical scavenging activity Phenolic Alkaloid

The Use of New Chemically Modified Cellulose for Heavy Metal Ion Adsorption and Antimicrobial Activities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Water Resource and Protection 2015年第6期7卷 530-545页

作者： R. Saravanan l. ravikumar KPR Institute of Engineering and Technology Research and Development Centre Bharathiar University Coimbatore India Department of Chemistry C. B. M. College (Affiliated to Bharathiar University) Coimbatore India

A novel chemically modified cellulose (DTD) adsorbent bearing pendent methyl benzalaniline chelating group was synthesized. This new adsorbent was used for the removal of Cu2+ and Pb2+ heavy metal ions from aqueous solution. The chemical and structural characteristics of the adsorbent were determined using FT-IR, 13C CP-MAS NMR, SEM, EDX and TGA analysis. The adsorption parameters, such as pH, adsorbent dose, contact time, initial metal ion concentration and temperature were optimized. Adsorption kinetic parameters were fitted into pseudo-first-order and pseudo-second-order models. The kinetic data fitted well to the pseudo-second-order kinetic model. The adsorption isotherms such as Freundlich and langmuir isotherms have been investigated. Thermodynamic parameters have also been evaluated. The negative values of △G0 and △H0 reveal that the adsorption system is spontaneous and exothermic in nature. The modified cellulose was challenged with microorganisms as a function of contact time. The biocidal results showed that the chemically modified cellulose has bactericidal effect against the bacterial species.

关键词： Modified Cellulose Metal Ion Adsorption Anti-Bacterial Activity

In vitro antiplasmodial effect of ethanolic extracts of coastal medicinal plants along Palk Strait against Plasmodium falciparum

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2012年第5期2卷 364-367页

作者： Samuel Jacob Inbaneson Sundaram ravikumar Palavesam Suganthi Department of Oceanography and Coastal Area Studies School of Marine SciencesAlagappa University

Objective:To identify the possible anliplasmodial compounds from Achyranlhes aspera(A. aspera).Acalypha indica(***),Jatropha glandulifera(***)and Phyllanlhus amarus(***).Methods:The ***,***,*** and *** were collected along Palk Strait and the extraction was carried out in *** filter sterilized extracts(100,50,25,12.5,6.25 and 3.125μg/ml) of leaf,stem,root and flower extracts of A aspera,A. indica,*** and *** were tested for anliplasmodial activity against Plasnuxlium *** potential extracts were also tested for their phytochemical ***: Of the selected plants species parts,the stem extract of *** showed excellent antiplasmodial activity(IC_(50)=43.81μg/ml) followed by stem extract of ***(IC_(50)= 49.14μg/ml).The stem extract of ***,leaf and root extracts of ***,leaf,root and seed extracts of J. glanduUfera and leaf and stem extracts of *** showed IC_(50),values between 50 and 100 μg/ *** analysis revealed that,significant antiplasmodial activity(Pl) was observed between the concentrations and time of *** chemical injury to erythrocytes was also carried out and it showed that there were no morphological changes in erythrocytes by the elhanolic extract of all the tested plant *** in vitro antiplasmodial activity might be due to the presence of alkaloids,glycosides,***,saponins,triterpenoids,proteins, and lannins in the elhanolic extracts of tested ***:The elhanolic stem extracts of *** and *** possess lead compounds for the development of antiplasmodial drugs.

关键词： Antiplasmodial activity IC_(50) Medicinal plants Phytochemicals Plasmodium falciparum Achyranthes aspera Acalypha indica Jatropha glandulifera Phyllanthus amarus

Synthesis and Characterization of Poly(azomethine ester)s with a Pendent Dimethoxy Benzylidene Group

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Polymer Chemistry 2013年第3期3卷 70-77页

作者： B. Joy Vasanthi l. ravikumar C.B.M. College Coimbatore India

Recently, soluble poly(azomethine ester)s with good thermal stability and liquid crystalline properties are much sought after in opto-electronic field. One such attempt was to synthesize poly(azomethine ester)s with a pendent group. In this study, the newly synthesized diacid monomer benzalaniline 3’-4’dimethoxy terepthalic acid was condensed with two diol monomers to get the polymers with pendent benzylidene group. The diacid monomer was characterized by UV, IR, NMR and CHNS analysis. The polymers were characterized by IR, TGA, and for liquid crystalline property. Polymer-I showed the highest thermal stability upto 335°C. Polymer-II exhibited liquid crystalline nature along with good solubility and thermal stability.

关键词： Poly(azomethine ester) Synthesis Phosphorylation Solubility liquid Crystalline

Biosynthesis of silver nanoparticles by using mangrove plant extract and their potential mosquito larvicidal property

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第10期4卷 799-803页

作者： M Gnanadesigan M Anand S ravikumar M Maruthupandy V Vijayakumar S Selvam M Dhineshkumar AK Kumaraguru School of Energy Environmental and Natural ResourcesDepartment of Marine and Coastal StudiesMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi CampusThondi-623409Ramanathapuram DistrictTamil NaduIndia School of Chemistry Department of Inorganic ChemistryMadurai Kamaraj UniversityMadurai-625021Tamil NaduIndia School of Chemistry Department of Industrial ChemistryAlagappa UniversityKaraikudi-630003Tamil NaduIndia

Objective:To identify the larvicidal activities of silver nano particles synthesised with Rhizophora mucronata（***） leaf extract against the larvae of Aedes aegypti（***） and Culex quinquefasciatus（***）.Methods:In vitro larvicidal activities such as lC50 and lC90 were assessed for the *** and *** larval ***, characterisation such as UV,XRD,FTIR and AFM analysis were carried out for the synthesised silver nano ***:The lC50 value of the synthesised silver nano particle was identified as 0.585 and 0.891 mgg/l for *** and *** larvae respectively. Further,the lG90 values are also identified as 2.615 and 6.291 mg/l for *** and Cx. quinquefasciatus species *** synthesised silver nanoparticles have maximum absorption at 420 nm with the average size of 60-95 *** XRD data showed 20 intense values with various degrees such as 37.10°,47.66°,63.97°and 70.01°.The FTIR data showed prominent peaks in（3 426.89,2 925.49,2 869.56,2 346.95,1 631.49,1 031.73,669.18 and 455.12） different ***:The biosynthesis of silver nanoparticles with leaf aqueous extract of R. mucronata provides potential source for the larvicidal activity against mosquito borne diseases.

关键词： Biosynthesis Mangroves larvicidal

Antagonistic properties of seagrass associated Streptomyces ***-1:A source for anthraquinone rich compound

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2012年第11期5卷 887-890页

作者： S.ravikumar M.Gnanadesigan A.Saravanan N.Monisha V.Brindha S.Muthumari School of Marine Sciences Department of Oceanography and Coastal Area StudiesAlagappa UniversityThondi campusThondi-623 409Ramanathapuram DistrictTamilnaduIndia Department of Microbiology Selvamm Arts and Science CollegeNamakkal-637 003TamilnaduIndia Department of Biotechnology AVS College of Arts and ScienceSalemTamilnaduIndia Department of Biotechnology Thassim Beevi Abdul Kader College for WomenKilakarai-623 517Ramanathapuram DistrictTamilnaduIndia Departemt of Biotechnology Meenakshi Ramasamy Arts and Science CollegeThathanur-621 804Ariyalur DistrictTamilnaduIndia

Objective:To identify the antibacterial potential of seagrass(Syringodium isoetifoliutn) associate microbes against bacterial ***:Eumeration of microbial associates were analyzed with leaf and root samples of Syringodium *** and MBC were calculated for bacterial pathogens with microbial *** and GC-MS analysis were calculated for Actinomycetes sp.(Act01) which was the most ***:Of the isolated microbial associates phosphatase producing bacterial isolates were identified as maximum [(26l.78±35.09) CFU×10~4/g]counts in root *** the selected microbial isolates Actinomycete sp(Act01) showed broad spectrum of antibacterial activity against antibiotic resistant and fish bacterial *** analysis of Act01 showed maximum identities(99%) with the Streptomyces sp.(GU5500072).The 16s rDNA secondary structure of Act01 showed the free energy values as -366.3 kkal/*** GC-MS analysis Act01 showed maximum retention value with 23.742 RT and the corresponding chemical class was identified as 1,4-dihydroxy-2-(3- hydroxybutyl)-9,10-anthraquinone 9,***:In conclusion,Streptomyces sp. (GU045544.1) from Syringodium isoetifolium could be used as potential antibacterial agent.

关键词： Actinomycetes sp. MIC MBC Phylogenetic analysis Syringodium isoetifolium