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The ecological response of natural phytoplankton population and related metabolic rates to future ocean acidification

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Journal of Oceanology and Limnology 2022年第3期40卷 999-1011页

作者： Haijiao LIU Yuying ZHAO Chao WU Wenzhe XU Xiaodong ZHANG Guicheng ZHANG satheeswaran thangaraj Jun SUN Research Centre for Indian Ocean Ecosystem Tianjin University of Science and TechnologyTianjin 300457China College of Marine Science and Technology China University of Geosciences(Wuhan)Wuhan 430074China Department of Marine Science Incheon National UniversityIncheon 22012Republic of Korea

Ocean acidifi cation(OA)and global warming-induced water column stratification can signifi cantly alter phytoplankton-related biological activity in the marine *** how these changes may play out in the tropical Indian Ocean remains *** study investigated the ecological and metabolic responses of the different phytoplankton functional groups to elevated CO_(2) partial pressure and nitrate deficiency in two different environments of the eastern Indian Ocean(EIO).It is revealed that phytoplankton growth and metabolic rates are more sensitive to inorganic nutrients rather than CO_(2).The combined interactive effects of OA and N-limitation on phytoplankton populations are functional *** particular,the abundance and calcification rate of calcifying coccolithophores are expected to be enhanced in the future *** underlying mechanisms for this enhancement may be ascribed to coccolithophore’s lower carbon concentrating mechanisms(CCMs)efficiency and OA-induced[HCO^(-)_(3)]*** comparison,the abundance of non-calcifying microphytoplankton(e.g.,diatoms and dinoflagellates)and primary productivity would be inhibited under those *** erent from previous laboratory experiments,interspecifi c competition for resources would be an important consideration in the natural phytoplankton *** combined factors would roughly determine calcifying coccolithophores as“winners”and non-calcifying microphytoplankton as“losers”in the future ocean *** to the large species-specific differences in phytoplankton sensitivity to OA,comprehensive investigations on oceanic phytoplankton communities are essential to precisely predict phytoplankton ecophysiological response to ocean acidification.

关键词： natural phytoplankton community ocean acidification coccolithophore calcification primary productivity eastern Indian Ocean

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Generation of ultra-wide and flat optical frequency comb based on electro absorption modulator

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Optoelectronics Letters 2018年第3期14卷 185-188页

作者： Ujjwal Jaisingh thangaraj Department of Electronics Engineering Indian Institute of Technology (Indian School of Mines)

A novel technique is proposed for the generation of ultra-wide and flat optical frequency comb(OFC)based on serially cascading three stages of electro absorption modulators(EAMs)through sinusoidal radio frequency(RF)signals by setting frequencies at f GHz,f/2 GHz and f/4 ***,the first stage acts as subcarrier generator,the second stage acts as subcarrier doubler,and the third stage acts as subcarrier *** addition,a higher number of subcarriers can easily be generated by adjusting the driving sinusoidal RF *** this paper,cascading three stages of EAMs driven by50 GHz,25 GHz and 12.5 GHz clock sources,we obtain 272 subcarriers with spacing of 2.5 GHz and power deviation within 1 d *** analysis of serially cascaded EAMs for subcarrier generation is also *** analysis and simulation of this technique are demonstrated.

关键词： Generation of ultra-wide and flat optical frequency electro absorption modulator

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Scope of biodiesel from oils of woody plants:a review

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Clean Energy 2020年第2期4卷 89-106页

作者： Baskar thangaraj Pravin Raj Solomon Pilot Plant Development and Training Institute King Mongkut’s University of Technology ThonburiBangkhuntienchaitalay RoadThakamBangkok-10150Thailand School of Chemical and Biotechnology SASTRA-Deemed UniversityThanjavur-613402Tamil NaduIndia

Non-edible oils obtained from chosen non-conventional woody plants are considered as potential raw materials for biodiesel *** plants mostly grow in *** characteristics of these oils as raw material are very much in tune with the properties of biodiesel such as long-chain hydrocarbon,having an adequate level of unsaturation with branched *** primary methods are being followed to make biodiesel from vegetable *** are direct use through blending,microemulsion,thermal cracking(pyrolysis)and ***-edible oil would eliminate the issue of food vs *** biodiesel manufactured from oils of woody plants may partially reduce the demand for liquid-fuel energy and addresses the environmental consequences of using fossil *** from a total of 17 species of woody plants(Angiosperms)belonging to 14 families are considered in this *** habit,habitat and geographical distribution of each species are also *** physico-chemical properties of their oil,with special reference to the fatty-acid profile that ultimately decides the characteristics of the biodiesel prepared from them,are reviewed.

关键词： woody plant oils biodiesel transesterification biodiesel properties

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Isolation and molecular characterization of bioactive secondary metabolites from Callyspongia *** fungi

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Asian Pacific Journal of Tropical Medicine 2010年第9期3卷 738-740页

作者： Meenupriya J thangaraj M Department of Biotechnology Sathyabama University Rajiv Gandhi SalaiChennai-119TamilnaduIndia CAS in Marine Biology Annamalai UniversityParangipettai - 608 502.Cuddalore DistrictIndia

Objective:To isolate and characterize the bioactive secondary metabolite from Callyspongia *** ***:In vitro antibacterial screening of fungi associated with Callyspongia species,collected from south east coast of India,against selected clinical isolates of bacteria were conducted in this *** extracts showing good antimicrobial activity were subjected to further analysis to identify the active constituents sponge associated fungi(both biomass and filtrate) with five different *** compound responsible for bioactivity was characterized using Fouvier-transform infrared(FT-IR) and gas chromatography-mass spectrometry(GC-MS) instrumental analysis to identify the functional group and *** molecular characterization of the elite fungal strains were done by isolating their genomic DNA and amplify the internal transcribed spacer(ITS) region of 5.8srRNA using specific ITS primer. The novelty of the strain was proved by BlastN analysis against non-redundant(NR) database and hence was submitted to ***:Active compound was Desmethylnomifensine confirmed by GC-MS and the potent fungi was Aspergillus flavus ***: The isolate exhibits a marked antagonistic activity against potential bacterial pathogens thus illuminating the advanced researches in this decade to focus on clinical pharmacology to identify novel therapeutic *** present study depicts a promising scenario to focus on Aspergillus flavus derived compounds which can be easily scaled up for large biomass production and stable formulation as a drug.

关键词： Callyspongia Sponge associated fungi Bioactive metabolites Anti bacterial activity

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Antidiabetic activity of aqueous root extract of Merremia tridentata(L.) Hall,*** streptozotocin-induced—diabetic rats

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Asian Pacific Journal of Tropical Medicine 2012年第3期5卷 175-179页

作者： Karuppusamy Arunachalam thangaraj Parimelazhagan Bioprospecting Laboratory Department of BotanyBharathiar University

Objective:To investigate the antidiabetic effect of aqueous extract of Merremia Iridentala (***) root(MTRAE) in normal,glucose-loaded hyperglycemic and streptozotoein(STZ)induced diabetic ***:Oral administration of MTRAE at the doses of 50,100 and 150 nig/kg was studied in normal,glucose-loaded and STZ-diabetie *** three doses caused significant reduction in blood glucose levels in all the ***:The effect was more pronounced in 100 and 150 mg/kg than 50 mg/*** also showed significaut increase in serum insulin,body weight and glycogen content in liver and skeletal muscle of STZ-induced dialietie rats while there was significant reduction in the levels of serum triglyceride and total *** also showed significant antilipidperoxidative effect in the pancreas of STZinduced diabetic *** antidiabetic effect of *** was compared with glibenclamide. a well known hypoglycemic ***:The results indicate that aqueous extract of M. tridentata root possesses significant antidiabetic activity.

关键词： Merremia tridentata root Streptozotocin Aqueous root extract Antihyperlipidemic Antilipidperoxidative

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Biodiesel production by the electrocatalytic process: a review

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Clean Energy 2021年第1期5卷 19-31页

作者： Baskar thangaraj Pravin Raj Solomon Pilot Plant Development and Training Institute King Mongkut’s University of Technology ThonburiBangkhuntien-chaitalay RoadThakamBangkok 10150Thailand School of Chemical&Biotechnology SASTRA-Deemed UniversityThanjavur 613401Tamil NaduIndia

Biodiesel-an impressive alternative fuel with favourable physico-chemical properties having environmental benefits-is prepared from vegetable ***,the cost is one of the main hurdles in commercializing *** production by conventional transesterification processes needs high ambient temperature and a specialized *** to the multifaceted adversities of many of the catalysts,there is active consideration for an electrocatalytic process that does not require elevated *** addition,an electrocatalytic process is carried out in the presence or absence of a catalyst or *** this review,various parameters such as electrolysis voltage,stirring rate,electrode type,water content,co-solvent type,reaction temperature,reaction duration,oil-to-methanol molar ratio and concentration of NaCl affecting the electrocatalytic transesterification process are presented.

关键词： electrolysis electrocatalytic reactor electrodes transesterification biodiesel

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AN M/M/C RETRIAL QUEUEING SYSTEM WITH BERNOULLI VACATIONS

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Journal of Systems Science and Systems Engineering 2009年第2期18卷 222-242页

作者： B.Krishna KUMAR R.RUKMANI V.thangaraj Department of Mathematics College of EngineeringAnna UniversityChennai600 025India Department of Mathematics Pachaiyappa's CollegeChennai600030India Ramanujan Institute for Advanced Study in Mathematics University of MadrasChennai600 005India

In this paper, a steady-state Markovian multi-server retrial queueing system with Bernoulli vacation scheduling service is studied. Using matrix-geometric approach, various interesting and important system performance measures are obtained. Further, the probability descriptors like ideal retrial and vain retrial are provided. Finally, extensive numerical illustrations are presented to indicate the quantifying nature of the approach to obtain solutions to this queueing system.

关键词： Retrial queue Bernoulli vacation matrix-geometric methods busy period vain retrial ideal retrial

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In vitro antioxidant,antimicrobial and anti-diabetic properties of polyphenols of Passiflora ligularis *** pulp

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Food Science and Human Wellness 2014年第2期3卷 56-64页

作者： Shanmugam Saravanan thangaraj Parimelazhagan Bioprospecting Laboratory Department of BotanySchool of Life SciencesBharathiar UniversityCoimbatore 641046India

In the present study,anti-radical,anti-diabetic and antimicrobial activities of different solvent extracts of Passiflora ligularis fruits were *** the various solvents,acetone extract displayed maximum total phenolic(640.70 mg GAE/g extract),tannin(214.30 mg GAE/g extract)and flavonoid contents(387.33 mg RE/g extract).Results of antioxidant studies revealed that the acetone extract of fruits possessed an efficient 2,2-diphenyl-1-picryl-hydrazyl(DPPH•)(IC5019.13g/mL),2,2-azinobis(3-ethylbenzothiozoline-6-sulfonic acid)(ABTS•+)(9800.94mol/L trolox equi/g extract),superoxide(78.27%)and nitric oxide(79.95%)radical scavenging activities,ferric reducing antioxidant power(43.06 mmol Fe(II)/mg extract),metal chelating(134.53 mg EDTA/g extract)*** acetone extract of *** fruits also exhibited significant(P<0.005)inhibition activities onα-amylase(82.56%)andα-glucosidase(75.36%)***,the fruits of *** also demonstrated antibacterial activities against Gram(+)and Gram(−)bacteria and inhibited the fungal strains Candida albicans(14.85 mm)and Aspergillus niger(13.91 mm)in the disc diffusion *** of polyphenolics by HPLC showed the presence of ellagic acid,gallic acid,and ***,the results indicate that the fruit pulp of *** can serve as a potential antioxidative and antimicrobial agent in food and pharmaceutical industries.

关键词： inhibited pulp radical

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Analytical characterization and structure elucidation of metabolites from Aspergillus ochraceus MP2 fungi

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Asian Pacific Journal of Tropical Biomedicine 2011年第5期1卷 376-380页

作者： Meenupriya J thangaraj M Department of Biotechnology Sathyabama University CAS in Marine biology Annamalai university

Objective:To isolate and characterize the bioactive secondary metabolites from Aspergillus ochraceus(***)MP2 ***:The anti bacterial activity of marine sponge derived fungi *** MP2 was thoroughly investigated against antagonistic human *** optimum inhibitory concentration of the fungi in the elite solvent was also *** promising extracts that showed good antimicrobial activity were subjected to further analytical separation to get individual distinct metabolites and the eluants were further identified by GC MS instrumental *** molecular characterization of the elite fungal strains were done by isolating their genomic DNA and amplify the internal transcribed spacer(US)region of 5.8s rRNA using specific ITS *** novelty of the strain was proved by homology search tools and elite sequences was submitted to ***:Three bioactive compounds were characterized to reveal their identity,chemical formula and *** first elutant was identified asα-Campholene aldehyde with chemical fonnula C_(10)H_(16)O and molecular weight 152 *** second elutant was identified as Lucenin-2 and chemical fonnula C_(27)H_(30)O_(16)and molecular weight *** third elutant was identified as 6-Ethyloct-3-yl-2-ethylhexyl ester with Chemical fonnula C_(26)H_(42)O_4 with molecular weight 418 ***:The isolated compounds showed significant antimicrobial activity against potential human *** secondary metabolites represent a large source of compounds endowed with ingenious structures and potent biological activities.

关键词： Marine sponge derived fungi Aspergillus ochraceus Bioactive metabolites Antibacterial activity Analytical characterization Fungi Apergillus Bioactive secondary metabolite Antagonistic human pathogen Antimicrobial activity Bioactive compounds

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Transient photoconductivity in a-(Se80Te20)100-xAgx（0≤x≤4） thin films

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Progress in Natural Science:Materials International 2012年第5期22卷 386-391页

作者： D.Singh S.Kumar R.thangaraj Semiconductors Laboratory Department of PhysicsGuru Nanak Dev UniversityAmritsarPunjab 143005India

Bulk material of(Se80Te20)100-xAgx(0≤x≤4) system was prepared by using a conventional melt quenching *** films of a-(Se80Te20)100-xAgx(0≤x≤4) were deposited by the vacuum evaporation technique at a base pressure of 10-4 mbar onto well-cleaned glass *** dependence of electrical conductivity in the temperature range of 263-333 K has been *** is increase in the value of conductivity with increase in temperature as well as with Ag *** measurements of intensity dependence of photoconductivity show that the photoconductivity increases with intensity as a power law where the power is found to be between 0.5 and 1.0,representing the continuous distribution of *** and decay of photocurrent with time at room temperature at different light intensities for(Se80Te20)98Ag2 thin film samples have also been *** results have been explained on the basis of the Dember voltage and interaction between photoexcited holes and the trapped electrons on the surface.

关键词： Chalcogenides Se-Te-Ag system Transient photoconductivity

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