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Characterization and optimization of EPSproducing and diesel oil-degrading Ochrobactrum anthropi MP3 isolated from refinery wastewater

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Petroleum Science 2014年第3期11卷 439-445页

作者： sugumar Ramasamy Prabhakaran Mathiyalagan Preethy Chandran Centre for Nanotechnology and Advanced Biomaterials School of Chemical and Biotechnology SASTRA University

Petroleum refinery wastewater （PRW） containing hydrocarbon is highly toxic to the environment and the surrounding ecosystem. Proper treatment of the PRW effluent is necessary to remove the pollutants before discharge. Bioremediation is considered to be a promising approach as it is eco- friendly and efficient. The exopolysaccharide （EPS） produced by the O. anthropi acts as a bioemulsifier and showed the highest emulsification activity of 60% on diesel. An EPS yield of about 0.42 g/L was obtained under optimized conditions. The carbohydrate and protein content of the EPS was found to be 71.1% and 19.7% respectively, showing the glycoprotein nature. The structural properties of EPS were analyzed by FT-IR and 1H NMR. The batch degradation of oil in PRW by O. anthropi was studied gravimetrically, and showed about 53% degradation in 7 days, indicating the strong ability of the isolated strain to degrade the hydrocarbons in PRW.

关键词： Hydrocarbons Ochrobactrum anthropi MP3 EPS bioemulsifier degradation

Heavy metal stress induced hyperglycemia in blue swimmer crab, Portunus pelagicus

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Acta Oceanologica Sinica 2018年第5期37卷 47-53页

作者： SARAVANAN R. sugumar V. BEEMA MAHIN M.I. Department of Oceanography and Coastal Area Studies Alagappa UniversityThondi Campus

The study was to find out the effect of cadmium and mercury on levels of hemolymph glucose, crustacean hyperglycemic hormone（CHH） and hepatopancreas glycogen in the blue swimmer crab Portunus pelagicus. The experiments were performed in both intact and eyestalk ablated crabs. Quantification of CHH was done by the indirect ELISA with the aid of primary anti-Carcinus maenas-CHH antibody. Higher glucose concentration was observed on exposure to 8×10^–6 of cadmium（（825.6±5.42） μg/m L） and 6×10^–6 of mercury（（90.5±6.25） μg/m L）after 48 h and 24 h respectively. Higher level of hemolymph glucose was observed in eyestalk intact crabs on exposure to cadmium and mercury than eyestalk ablated crabs. Decrease in the levels of CHH was observed in both eyestalk intact and ablated crabs on heavy metal exposure. Decline of the hepatopancreas glycogen level was also witnessed with the exposure to heavy metal, which validated its utilization in the production of glucose. Thus this study brings to light, the variations in hemolymph glucose, CHH and hepatopancreas glycogen on heavy metal stress. These carbohydrate metabolites can be used as biomarkers in assessing heavy metal contamination in water bodies.

关键词： crustacean hyperglycemic hormone cadmium mercury decapod crustaceans blue swimmer crab

Transient Behavior of a Single-Server Markovian Queue with Balking and Working Vacation Interruptions

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Journal of the Operations Research Society of China 2021年第2期9卷 321-341页

作者： Arumugam Azhagappan Thirunavukkarasu deepa Department of Mathematics St.Anne’s College of Engineering and TechnologyAnna UniversityPanrutiTamilnadu 607110India Department of Mathematics Idhaya College of Arts and Science for WomenPondicherry UniversityPakkamudayanpetPuducherry 605008India

This paper studies the time-dependent analysis of an M/M/1 queueing model with single,multiple working vacation,balking and vacation *** the system becomes empty,the server commences working *** the working vacation period,if the queue length reaches a positive threshold value‘k’,the working vacation of the server is interrupted and it immediately starts the service in an exhaustive *** working vacations,the customers become discouraged due to the slow service and possess balking *** transient system size probabilities of the proposed model are derived explicitly using the method of generating function and continued *** performance indices such as average and variance of system size are also ***,numerical simulations are presented to analyze the impact of system parameters.

关键词： The M/M/1 queue Single and multiple working vacation Balking Vacation interruption Continued fractions Transient probabilities

Easy-to-fabricate high efficiency silicon nanowires solar cell modified by CdTe and zinc tetraphenyl porphyrin nanostructures

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Journal of Energy Chemistry 2021年第12期30卷 484-497,I0012页

作者： Debanjan Maity Saurabh Kumar Pathak Melepurath deepa Department of Chemistry Indian Institute of Technology HyderabadKandiSangareddyTelangana 502284India

Liquid junction solar cell(LJSC) with vertically silicon nanowires(SiNWs) as the primary photosensitizer,co-sensitized with luminescent and narrow gap CdTe nanoparticles,and cuboidal microstructures of zinc tetraphenyl porphyrin(ZnTPP) dye offers broad and intense visible light absorption that translates into a maximum power conversion efficiency(PCE) of 9.09%,when combined with a polymeric gel of a I_(2)/I^(-)redox couple as the hole transport material and a counter electrode(CE) of poly(3,4-ethyelenedioxythio phene) doped with imide ions(PEDOT-N(CF_(3) SO_(2))_(2)),under 1 sun *** p-type CdTe efficiently scavenges holes from SiNWs and simultaneously allows the passage of photoexcited electrons from ZnTPP to SiNWs via electrical conduction thus imparting an enhanced solar cell *** also supresses back electron transfer effectively,as is inferred from a ~68% enhancement in PCE compared to SiNWs *** of the CE entailed the evaluation of the effect of dopant anion:imide versus dicyanamide in PEDOT,and revealed that the presence of macro-cracks in the polymer surface,a deeper work function,and a lower electrical conductance are the shortcomings of the dicyanamide doped PEDOT and reduce the overall PCE,compared to *** study brings out how by judicious choice of photoanode and CE components,efficient,stable and easy-to-assemble LJSCs can be developed.

关键词： Silicon Nanowires Porphyrin Solar cell Hole transfer

Development of a new single dose extended release formulation of cefpodoxime proxetil

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Asian Pacific Journal of Tropical Medicine 2010年第2期3卷 117-120页

作者： deepa Karthikeyan Karthikeyan M Department of Pharmaceutics Nehru College PharmacyPambadyThiruvilwamalaThrissur DistrictKerala State- 680597India Department of Pharmacology Al Shifa College of PharmacyPoothavanam(P.O.)KizhatturPerintalmannaMalappuram DistrictKerala State679325India

Objective:To develop floating microspheres of cefpodoxime proxetil(CP) in order to achieve an extended retention in the upper GIT for 12 ***:The microspheres were prepared by non aqueous solvent evaporation method using different ratios of cefpodoxime proxetil, hydroxyl propyl methyl cellulose(HPMC K4M ) and ethyl cellulose(1:1:1,1:1:2,1:1:3,1:1:4, 1:1:5 & 1:1:6),in the mixture of dichloromethane and ethanol at ratio of(l:l),with tween80 as the ***:The floating microspheres was extended over 10-12 hours and were characterized by particle size analysis(75-600μm),buoyancy percentage(68.1%-85.4%), drug entrapment efficiency(67.5%-88.8%),%yield(50.50%-77.31%) and in vitro drug release was studied for 12 ***:The floating microspheres show better result and it may be use full for prolong the drug release in stomach and improve the bioavailability.

关键词： Floating microspheres Cefpodoxime proxetil Single dose Extended release formulation

Anti-inflammatory activity of Premna corymbosa(Burm.f.) Rottl.& *** extracts in Wistar albino rats

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Asian Pacific Journal of Tropical Medicine 2011年第7期4卷 510-513页

作者： Karthikeyan M deepa MK Department of Pharmacology Al Shifa College of PharmacyPoonthavanam(P.O.)Kizhattur PerinthalmannaMalappuram-679325 Kerala StateIndia Department of Pharmaceutics Nehru College of PharmacyPambadyTriruvilwamalaThrissur DistrictKerala State - 680 597India

Objective:To evaluate the acute toxicity and to investigate the effect of Premna corymbosa ethanolic extract(PCEE) at doses of 200 and 400 mg /kg body weight in acute and chronic models of inflammation in experimental ***:In the acute toxicity study,a single dose of PCEE of 2 000 mg/kg body weight,*** administered and observed for 48 *** acute models as egg albumin induced paw edema and chronic model as cotton pellet methods was followed. Results:In acute models,egg albumin induced paw edema PCEE significantly(P<0.01) inhibited the edema *** chronic model,cotton pellet induced granuloma formation in rats PCEE significantly(P<0.01) reduced the granuloma formation with percentage inhibition of 35.17%and 50.38%***:The present study establishes the antiinflammatory activity of Premna corymbosa leaves.

关键词： Premna corymbosa Anti-Inflammatory activity Fresh egg albumin Cotton pellet

Hepatoprotective effect of Premna corymbosa(Burm.f.) Rottl.& *** extract on CCl_4 induced hepatic damage in Wistar albino rats

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Asian Pacific Journal of Tropical Medicine 2010年第1期3卷 17-20页

作者： Karthikeyan M deepa K Department of Pharmacology Al Shifa College of PharmacyPoonthavanamKizhattur(PO)PerintalmannaMalappuram districtKerala State-679329India. Department of Pharmaceutics Nehru college of PharmacyPambadyTriruvilwamalaThrissur districtKerala State - 680 597India.

Objective:To investigate the hepetoprotective activity of Premna corymbosa leaves against carbon tetrachloride(CCl_4) induced hepatic ***:Hepatotoxicity was induced in wistar rats of both sexes by intraperitoneal injection of CCl_4,1 mL/kg body weight for every 72 *** ethanolic extract of Premna corymbosa leaves were administrated at doses of 200 & 400 mL/kg body weight, p.o.,daily for 14 *** hepatotoxicity and its prevention was assessed by serum markers like serum alkaline phosphatase(SALP),serum triglycerides(STG),serum total protein(STP), serum cholesterol(SC),and liver wet weight and histopathological studies of the ***:In treatment with the ethanolic extract,the toxic effect of CCl_4 was controlled significantly(P<0.01) by restoration of the levels of biochemical parameters as compared to normal and standard drug silymarin treated *** liver weight was reduced by the ethanolic extract treated groups. The histopathology of the liver sections evidenced the hepatoprotective ***:The ethanolic extract of the leaves of Premna corymbosa possess significant acute hepatoprotective *** corymbosa can be recommended for the liver disorders.

关键词： Premna corymbosa Leaves Ethanolic extract CCl_4-induced liver damage Hepatoprotective effect

STRUCTURAL EVOLUTION IN BIORENEWABLE SOY BASED POLYURETHANES

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Chinese Journal of Polymer Science 2009年第4期27卷 447-454页

作者： deepa Puthanparambil Casey Kimball Shaw Ling Hsu Polymer Science and Engineering Department and Materials Research Science and Engineering Center University of MassachusettsAmherstMA 01003USA Douglas McKinnon Hall Williston Northampton AcademyEasthamptonMA 01027USA Invited lecture presented at the International Symposium on Polymer Physics

Spectroscopic studies have revealed that the amount of polyureas formed and the kinetics of their formation in soy based polyurethane systems are considerably different from traditional systems employing ethylene oxide-propylene oxide (EO-PO) based *** aggregation of polyureas was characterized by the hydrogen bonds formed utilizing FTIR *** study offered the opportunity to assign the previously undefined infrared *** structural transformation is reflected in the segmental rel...

关键词： Spectroscopy Miscibility Polyurethanes

Mean-Field, Infinite Horizon, Optimal Control of Nonlinear Stochastic Delay System Governed by Teugels Martingales Associated with Lévy Processes

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Communications in Mathematics and Statistics 2019年第2期7卷 163-180页

作者： P.Muthukumar R.deepa Department of Mathematics The Gandhigram Rural Institute(Deemed to be University)GandhigramDindigulTamil Nadu 624302India

This paper focuses on optimal control of nonlinear stochastic delay system constructed through Teugels martingales associated with Lévy processes and standard Brownian motion,in which finite horizon is extended to infinite *** order to describe the interacting many-body system,the expectation values of state processes are added to the concerned ***,sufficient and necessary conditions are established under convexity assumptions of the control ***,an example is given to demonstrate the application of the theory.

关键词： Backward stochastic delay differential equation Infinite horizon Lévy processes Mean-field Stochastic maximum principle Teugels martingales