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Physical, Thermal and Mechanical Properties of Areca Fibre Reinforced Polymer Composites – An Overview

Journal of Bionic Engineering 2020年第1期17卷 185-205页

作者： tamil moli loganathan Mohamed Thariq Hameed Sultan Mohammad Jawaid Ain Umaira Md Shah Qumrul Ahsan Manohar Mariapan Mohd Shukry bin Abdul Majid Department of Aerospace Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products(INTROP)Universiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia Aerospace Malaysia Innovation Centre(944751-A) Prime Minister's DepartmentMIGHT Partnership HubJalan Impact63000 CyberjayaSelangor Darul EhsanMalaysia Faculty of Manufacturing Engineering Universiti Teknikal Malaysia MelakaHang Tuah Jaya76100 Durian TunggalMelakaMalaysia Department of Science Park and Recreation Faculty of ForestryUniversiti Putra Malaysia43400 UPM SerdangSelangor Darul EhsanMalaysia School of Mechatronic Engineering Universiti Malaysia PerlisPauh Putra Campus02600 ArauPerlisMalaysia

Areca catechu,is a species of palm belonging to the family of Arecaceae/Palmae,grows vertically,to the height of 10 m to 20 m,the stem is straight,solitary and slender,10 cm to 15 cm in diameter,with marks of annulated scars of fallen leaf *** fibres are predominantly extracted not only from the fruit as areca husk,but also from leaf stalks and *** this review paper,areca fibre is compared with those of other representative species of the Arecaceae/Palmae family,such as the coconut tree and the palm tree,in terms of physical and mechanical *** review article also discusses the physical,mechanical and thermal properties of areca fibre and its *** review of known published data reveals that,while areca fibre has the potential to be used as an alternative reinforcement in polymer ***,it has been also noticed that some other species from the family of Arecaceae/Palmae have not been explored as natural fibre reinforcement in polymer composites either,thus revealing further options of natural alternative reinforcement to be investigated with regard to their potential to be used in fibre based composites for the automotive,aerospace,and construction industries.

关键词： natural fibres areca mechanical properties surface treatment hybrid composites

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Dual antidiabetic and antihypertensive activity of fucoxanthin isolated from Sargassum wightii Greville in in vivo rat model

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Food Science and Human Wellness 2023年第5期12卷 1693-1700页

作者： Vijayan Raji Chitra loganathan Thiyagarajan Ramesh Palvannan Thayumanavan Department of Biochemistry Periyar UniversitySalemTamil Nadu 636011India Department of Basic Medical Sciences College of MedicinePrince Sattam Bin Abdulaziz UniversityAl-Kharj 11942Kingdom of Saudi Arabia

In a previous study from our laboratory, fucoxanthin purified from brown algae, Sargassum wightii Greville has found to exhibit antioxidant activity and inhibition of angiotensin-I-converting enzyme(ACE)in vitro. The present study aims in understanding the protective effect of fucoxanthin purified from S. wightii against diabetes with hypertension in in vivo. Diabetes and hypertension were induced in rat by streptozotocin and sodium chloride treatment, respectively. In diabetes with hypertension rat, the blood pressure was increased along with hyperglycemia. Administration of fucoxanthin significantly reduced the blood pressure and ACE activity in diabetes with hypertension rat. Furthermore, administration of fucoxanthin significantly reduced the hyperglycemic state. The activity of various enzymes in the liver(hexokinase, glucose-6-phosphate dehydrogenase, glucose-6-phosphatase and fructose-1,6-phosphatase)and serum(creatine kinase)were normalized to that of control level. The level of glycogen, glycoprotein component and lipid profile were equivalent to control level by fucoxanthin administration in diabetes with hypertension rats. Fucoxanthin ameliorated the oxidative stress by preserving the endogenous antioxidant levels in diabetes with hypertension rats. Also, the pancreatic histological integrity was similar to that of control level in diabetes with hypertension rats by fucoxanthin treatment. Altogether, fucoxanthin showed dual antidiabetic and antihypertensive activity in vivo.

关键词： Fucoxanthin Diabetes Hypertension Oxidative stress Angiotensin-I-converting enzyme

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APPROXIMATE CONTROLLABILITY RESULTS FOR INTEGRO-QUASILINEAR EVOLUTION EQUATIONS VIA TRAJECTORY REACHABLE SETS

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Acta Mathematica Scientia 2020年第2期40卷 412-424页

作者： A.Vinodkumar C.loganathan S.Vijay Department of Mathematics Amrita School of EngineeringAmrita Vishwa VidyapeethamCoimbatore-641112India Department of Mathematics Maharaja Arts and Science CollegeCoimbatore-641407Tamil NaduIndia

In this article,we study the approximate controllability results for an integroquasilinear evolution equation with random impulsive moments under sufficient *** results are obtained by the theory of C0 semigroup of bounded linear operators on evolution equations and using trajectory reachable ***,we generalize the results too with and without fixed type impulsive moments.

关键词： Integro-quasilinear control system random impulses approximate controllability

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Antioxidant activity of newly discovered lineage of marine actinobacteria

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Asian Pacific Journal of Tropical Medicine 2013年第4期6卷 325-332页

作者： loganathan Karthik Gaurav Kumar Kokati Venkata Bhaskara Rao Environmental Biotechnology Division School of Bio Sciences and TechnologyVIT UniversityVelloreTamil NaduIndia

Objective:To investigate the antioxidant activity of marine ***:The content of total phenolics,the level of antioxidant potential by DPPH radical scavenging activity,metal chelating activity,FRAP method,βcarotene assay and NO scavenging activity in extract were ***:In all the methods the extract exhibited good scavenging activity except NO scavenging *** IC50 values of marine actinobacteria extract on DPPH radical were found to be 41.09μg/*** zone of color retention was 12 mm inβ-carotene bleaching assay. DNA protective efficiency of the extracts was also studied using UV- photolysed H2O2-driven oxidative damage to *** analysis identified some of the major phenolic compounds in extracts,which might he responsible for the antioxidant potential and *** showed a 100%cytotoxic effect in brine shrimp lethality assay within 10 *** novel actinobacteria was identified as Streptomyces LK-3（JF710608） through I6S rDNA ***:The results obtained suggest that the extracts bear anti-cancer metabolites and could be considered as a potential source for anti-cancer drug development.

关键词： Streptomyces LK-3 Antioxidant DPPH radical scavenging assay Cytotoxicity

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Phytochemical composition and in vitro antioxidant activity of aqueous extract of Aerva lanata(L.) *** ***(Amaranthaceae)

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Asian Pacific Journal of Tropical Medicine 2013年第3期6卷 180-187页

作者： Gaurav Kumar loganathan Karthik Kokati Vankata Bhaskara Rao Molecular and Microbiology Research Laboratory Environmental Biotechnology DivisionSchool of Bio Sciences and TechnologyVIT UniversityVelloreTamil Nadu-632 014India

Objective:To analyze the phytochemical composition and in vitro antioxidant properties of aqueous extract of Aerva Lanata（***） ***:During the preliminary phytochemical analysis,the aqueous extract of *** was screened for the presence of carbohydrates,proteins,phenolic compounds,oil and fats,saponins,flavonoids,alkaloids. tannins and *** activity of the extract was determined by 2.2-dipbenyl- 1-picrylhydrazyl radical scavenging activity,metal chelating activity,reducing power activity and DNA damage inhibition *** of phenolic compounds was performed by FolinCiocaiteau reagent method and gradient high performance liquid chromatography technique. Results:Preliminary phytochemical analysis exhibited the presence of phenolic compounds, *** and phytosterols as major phytochemical *** extract exhibited high 2.2—diphenyl-1-picrylhydrazyl radical scavenging activity(IC50= 110.74μg/ mL).metal chelating activity(IC50= 758.17μg/mL).reducing power activity and DIA damage inhibition *** extract was reported to possess a high amount of total phenolic content and some of them were identified as gallic acid（3,4,3-OH）,apigenin-7—O-glucoside tapigetrin), quercetin-3—O-rutinoside（rutin） and myricetin（3,5,7,3,4,5-OH）by high performance liquid chromatography *** extract was found non toxic towards human erythrocytes in the hemolytic assay(IC50= 24.89 mg/mL).Conclusions:These results conclud that *** stem possesses high antioxidant activity and can he used for the development of natural and sale antioxidant compounds.

关键词： Aerva lanata Antioxidant DPPH radical scavenging assay Phenolic compounds Hemolytic activity

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Tree species as hosts for arbuscular mycorrhizal and dark septate endophyte fungi

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Journal of Forestry Research 2012年第4期23卷 641-649页

作者： E.Uma K.Sathiyadash J.loganathan T.Muthukumar Root and Soil Biology Laboratory Department of BotanyBharathiar UniversityCoimbatore 641046Tamil NaduIndia

A survey of 35 tree species （belonging to 28 genera in 19 families） in Aliyar, South India was carried out to ascertain their arbuscular mycorrhizal （AM） and dark septate endophyte （DSE） fungal status. All the tree species examined had AM association. AM and DSE coloni- zation is reported for the first time in 20 and 14 species respectively. Co- occurrence of AM and DSE was observed in 14 （40%） tree species. The extent of DSE colonization was inversely related to the extent of AM fungal colonization. Six tree species had Arum-type, 18 had intermediate- type and 11 had typical Paris-type AM morphology. AM fungal spore morphotypes belonging to 11 species in two genera were isolated from the rhizosphere soil. AM fungal spore numbers were not related to the ex- tent of AM colonization and Glomus dominated spore diversity. AM association individually and along with DSE were found respectively in the 63% and 44% of the economically important tree species. The occur- rence of AM and DSE fungal association in economically important indigenous tree species indicates the possibility of exploiting this asso- ciation in future conservation programmes of these species.

关键词： tree species AM fungi Arum-, Paris-, intermediate- type dark septate endophyte (DSE)

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Experimental and numerical analyses of magnesium alloy hot workability

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Journal of Magnesium and Alloys 2016年第4期4卷 295-301页

作者： F.Abbassi M.Srinivasan C.loganathan R.Narayanasamy M.Gupta Mechanical engineering department college of engineeringdhofar universityp.o.box 2509211 salalahoman Urmssdt ensituniversity of tunis5 avenue taha husseinbp56bâb manara 1008tunisia Department of mechanical engineering chartered institute of technologyabu roadsirohirajasthan 307510india Department of production engineering national institute of technologytiruchirappallitamil nadu 620015india Department of mechanical engineering national university of singapore

Due to their hexagonal crystal structure,magnesium alloys have relatively low workability at room *** this study,the hot workability behavior of cast-extruded AZ31B magnesium alloy is studied through hot compression testing,numerical modeling and microstructural *** deformation tests are performed at temperatures of 250℃ to 400℃ under strain rates of 0.01 to 1.0 s^(−1).Transmission electron microscopy is used to reveal the presence of dynamic recrystallization(DRX),dynamic recovery(DRY),cracks and shear *** predict plastic instabilities during hot compression tests of AZ31B magnesium alloy,the authors use Johnson–Cook damage model in a 3D finite element *** optimal hot workability of magnesium alloy is found at a temperature(T)of 400℃ and strain rate(ε)of 0.01 s^(−1).Stability is found at a lower strain rate,and instability is found at a higher strain rate.

关键词： AZ31B magnesium alloy Hot workability Damage Plastic instability TEM analysis FEM

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Isolation and characterization of tyrosinase produced by marine actinobacteria and its application in the removal of phenol from aqueous environment

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Frontiers in Biology 2014年第4期9卷 306-316页

作者： Suki ROY Ishita DAS Minki MUNJAL loganathan KARTHIK Gaurav KUMAR Sathish KUMAR Kokati Venkata Bhaskara RAO Molecular and Microbiology Research Laboratory School of Bio Sciences and Technology VIT University Vellore-632014 Tamil Nadu India Department of Biotechnology Shri JJT University Jhunjhunu Raiasthan India

The present study was focused on screening and characterization of tyrosinase enzyme produced by marine actinobacteria and its application in phenolic compounds removal from aqueous solution. A total of 20 strains were isolated from marine sediment sample and screened for tyrosinase production by using skimmed milk agar medium. Among 20 isolates, two isolates LK-4 and LK-20 showed zone of hydrolysis and these were taken for secondary screening by using tyrosiue agar medium. Based on the result of secondary screening LK-4 was selected for further analysis, such as tyrosinase assay, protein content and specific activity of the enzyme. The tyrosinase enzyme was produced in a SS medium and was partially purified by ammonium sulfate precipitation, dialysis and SDS PAGE. The isolate （LK-4） was identified as Streptomyces espinosus using 16S rRNA gene sequencing and named as ＂Streptomyces espinosus strain LK4 （KF806735）＂. The tyrosinase enzyme was immobilized in sodium alginate which was applied to remove phenolic compounds from water. The enzyme efficiently removed the phenolic compounds from aqueous solution within few hours which indicated that tyrosinasc enzyme produced by Streptomyces espinosus strain LK-4 can be potently used for the removal of phenol and phenolic compounds from wastewater in industries.

关键词： actinobacteria phenolic compounds immobilization tyrosinase

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Plant growth-promoting rhizobacteria(PGPR)and its mechanisms against plant diseases for sustainable agriculture and better productivity

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BIOCELL 2022年第8期46卷 1843-1859页

作者： PRANAB DUTTA GOMATHY MUTHUKRISHNAN SABARINATHAN KUTALINGAM GOPALASUBRAMAIAM RAJAKUMAR DHARMARAJ ANANTHI KARUPPAIAH KARTHIBA loganathan KALAISELVI PERIYASAMY MARUMUGAM PILLAI GK UPAMANYA SARODEE BORUAH LIPA DEB ARTI KUMARI MADHUSMITA MAHANTA PUNABATI HEISNAM AK MISHRA School of Crop Protection Central Agricultural University(Imphal)UmiamIndia Department of Soil Science and Agricultural Chemistry Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Department of Crop physiology Agricultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Departments of Pulses Tamil Nadu Agricultural UniversityCoimbatoreKoyingbatoreIndia Department of Environmental Sciences Horticultural College and Research InstituteTamil Nadu Agricultural UniversityKoyingbatoreIndia Department of Plant pathology Assam Agricultural UniversityDhubriIndia KVK-Tinsukia Assam Agricultural UniversityTinsukiaIndia Department of Plant Pathology Central Agricultural University(Imphal)PasighatIndia Department of Plant Pathology Dr Rajendra Prasad Central Agricultural UniversityBiharIndia

Plant growth-promoting rhizobacteria(PGPR)are specialized bacterial communities inhabiting the root rhizosphere and the secretion of root exudates helps to,regulate the microbial dynamics and their interactions with the *** bacteria viz.,Agrobacterium,Arthobacter,Azospirillum,Bacillus,Burkholderia,Flavobacterium,Pseudomonas,Rhizobium,etc.,play important role in plant growth *** addition,such symbiotic associations of PGPRs in the rhizospheric region also confer protection against several diseases caused by bacterial,fungal and viral *** biocontrol mechanism utilized by PGPR includes direct and indirect mechanisms direct PGPR mechanisms include the production of antibiotic,siderophore,and hydrolytic enzymes,competition for space and nutrients,and quorum sensing whereas,indirect mechanisms include rhizomicrobiome regulation *** of root exudates,phytostimulation through the release of phytohormones viz.,auxin,cytokinin,gibberellic acid,1-aminocyclopropane-1-carboxylate and induction of systemic resistance through expression of antioxidant defense enzymes viz.,phenylalanine ammonia lyase(PAL),peroxidase(PO),polyphenyloxidases(PPO),superoxide dismutase(SOD),chitinase andβ-*** the suppression of plant diseases potent bio inoculants can be developed by modulating the rhizomicrobiome through rhizospheric *** addition,understandings of different strategies to improve PGPR strains,their competence,colonization efficiency,persistence and its future implications should also be taken into consideration.

关键词： Plant growth-promoting rhizobacteria Biocontrol Plant diseases PGPR mechanisms Sustainable agriculture

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Fungal Microbes Associated with Agarwood Formation

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American Journal of Plant Sciences 2016年第10期7卷 1445-1452页

作者： Muthuraj Sangareswari@Nagajothi Kalappan Thangamuthu Parthiban Subramani Umesh Kanna loganathan Karthiba Duraisamy Saravanakumar Forest College and Research Institute Tamil Nadu Agricultural University Mettupalayam India Department of Food Production Faculty of Food and Agriculture The University of the West Indies St. Augustine Trinidad and Tobago

Agarwood is studied as the resinous secondary metabolites produced by the natural microbial infection. The current study investigated the range of microbial infection in agarwood trees collected from various parts of India. A total of 17 isolates were collected and identified based on the morphological and molecular studies. The study revealed that the agarwood was naturally infected with Aspergillus, Lasiodiploidia, Chaetomium, Fusarium and Penicillium species. Further studies on enzyme activities involved in the pathogenesis process showed the higher cellulase, ligninolytic and laccase activities in Aspergillus isolate AR13 when compared to other isolates. The current study has offered a potential opportunity to further strengthen the research on possible development of microbial strains for artificial inoculation in agar trees to induce agarwood formation.

关键词： Agarwood Aspergillus Cellulase Laccase Fungi

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