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Gandhimathi R, Pinotsi D, Köhler M, Mansfeld J, Ashiono C, Kleele T, Pawar S, Kutay U. Super-resolution microscopy reveals focal organization of ER-associated Y-complexes in mitosis. EMBO Rep 2023; 24:e56766. [PMID: 37469276 PMCID: PMC10481662 DOI: 10.15252/embr.202356766] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 07/03/2023] [Accepted: 07/03/2023] [Indexed: 07/21/2023] Open
Abstract
During mitotic entry of vertebrate cells, nuclear pore complexes (NPCs) are rapidly disintegrated. NPC disassembly is initiated by hyperphosphorylation of linker nucleoporins (Nups), which leads to the dissociation of FG repeat Nups and relaxation of the nuclear permeability barrier. However, less is known about disintegration of the huge nuclear and cytoplasmic rings, which are formed by annular assemblies of Y-complexes that are dissociated from NPCs as intact units. Surprisingly, we observe that Y-complex Nups display slower dissociation kinetics compared with other Nups during in vitro NPC disassembly, indicating a mechanistic difference in the disintegration of Y-based rings. Intriguingly, biochemical experiments reveal that a fraction of Y-complexes remains associated with mitotic ER membranes, supporting recent microscopic observations. Visualization of mitotic Y-complexes by super-resolution microscopy demonstrates that they form two classes of higher order assemblies: large clusters at kinetochores and small, focal ER-associated assemblies. These, however, lack features qualifying them as persisting ring-shaped subassemblies previously proposed to serve as structural templates for NPC reassembly during mitotic exit, which helps to refine current models of nuclear reassembly.
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Affiliation(s)
- Rojapriyadharshini Gandhimathi
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
- Molecular Life Sciences Ph.D. ProgramZurichSwitzerland
| | | | - Mario Köhler
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
| | - Jörg Mansfeld
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
- The Institute of Cancer ResearchLondonUK
| | - Caroline Ashiono
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
| | - Tatjana Kleele
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
| | - Sumit Pawar
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
- Present address:
Myllia BiotechnologyViennaAustria
| | - Ulrike Kutay
- Department of Biology, Institute of BiochemistryETH ZurichZurichSwitzerland
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2
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Preethi V, Nair S, Ramesh ST, Gandhimathi R. Exploration of the performance of iron-based superhydrophilic meshes for oil-water separation. J Environ Sci Health A Tox Hazard Subst Environ Eng 2023; 58:793-804. [PMID: 37458992 DOI: 10.1080/10934529.2023.2236534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 06/22/2023] [Accepted: 06/26/2023] [Indexed: 08/01/2023]
Abstract
This study investigates the oil-water separation capability of iron-based superhydrophilic meshes. It also intends to provide an optimistic view of their potential for industrial application. Oil-water separation performance of the 150 mesh, 300 mesh, and 400 mesh is primarily examined by analyzing the efficiency and speediness of separation as well as the limit of oil intrusion using petroleum based oils. The superhydrophilic meshes are further applied for oil-water separation of locomotive wash effluent. The superhydrophilic meshes showed good oil-water separation behavior. The 300 mesh is observed to have superior separation performance. It is also tested to have good reusability and resistance in harsh conditions. The separation effectiveness of 94.7%, reduced turbidity of 21.8 NTU, and chemical oxygen demand of around 70 ppm, along with reasonable flux and intrusion pressure values of 73.28 Lm-2min-1 and 0.848 kPa, respectively, are noticed for the separation study conducted for locomotive wash effluent using the designated superhydrophilic mesh. This study hence as well demonstrates a prospective future of superhydrophilic mesh for practical utility.
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Affiliation(s)
- V Preethi
- Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India
| | - Shradha Nair
- Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu, India
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3
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Raju L, Gandhimathi R, Mathew A, Ramesh S. Spatio-temporal modelling of particulate matter concentrations using satellite derived aerosol optical depth over coastal region of Chennai in India. ECOL INFORM 2022. [DOI: 10.1016/j.ecoinf.2022.101681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Koulini GV, Laiju AR, Ramesh ST, Gandhimathi R, Nidheesh PV. Effective degradation of azo dye from textile wastewater by electro-peroxone process. Chemosphere 2022; 289:133152. [PMID: 34875291 DOI: 10.1016/j.chemosphere.2021.133152] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 05/09/2023]
Abstract
Color-producing chemicals emitted from many sources, such as textile or dye manufacturing industries, are a significant concern worldwide. The present study focuses on the electro-peroxone (EP) process for decolorizing a synthetic azo dye, C.I. Reactive Black 5 (RB5). Findings suggest that the EP process is more effective for dye degradation than ozonation and electrolysis. The EP process resulted in 100% decolorization after 60 min of contact time under optimum testing conditions such as pH 7, applied current 300 mA, and sulfate concentration 3.55 g L-1. Based on the findings of the primary investigation, EP treatment of real textile effluent was carried out and 2 h of EP treatment resulted in 99% decolorization and 74%total organic carbon (TOC) removal. As an outcome, the EP process can treat textile wastewater in a cost-effective and environmentally friendly manner.
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Affiliation(s)
- G V Koulini
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - A R Laiju
- Department of Civil Engineering, National Institute of Technology, Uttarakhand, India
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India.
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India.
| | - P V Nidheesh
- CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, India.
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5
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Sheeba DAH, Gandhimathi R. An Overview on Hyperlipidemia. JPRI 2021. [DOI: 10.9734/jpri/2021/v33i59b34413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Introduction: Hyperlipidemia is a medical condition indicated by an increase in one or more plasma lipids, such as triglycerides, cholesterol, cholesterol esters, phospholipids, and/or plasma lipoproteins, such as very low-density lipoprotein and low-density lipoprotein, as well as decreased levels of high-density lipoprotein. This increase in plasma lipids is one of the most important risk factors for cardiovascular disease. In the meanwhile, statins and fibrates remain the most common anti-hyperlipidemic drugs for treating high plasma cholesterol and triglycerides.
Conclusion: Hence this review focused to study of hyperlipidemia. This review is useful to research work in hyperlididemia.
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6
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Antony J, Niveditha SV, Gandhimathi R, Ramesh ST, Nidheesh PV. Stabilized landfill leachate treatment by zero valent aluminium-acid system combined with hydrogen peroxide and persulfate based advanced oxidation process. Waste Manag 2020; 106:1-11. [PMID: 32172098 DOI: 10.1016/j.wasman.2020.03.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 12/02/2019] [Accepted: 03/03/2020] [Indexed: 06/10/2023]
Abstract
The toxic leachate generated from landfills is becoming a major nuisance to the environment and has vital role in groundwater contamination. This study evaluated the potential of zero valent aluminium (ZVAl) based advanced oxidation processes (AOPs) for stabilized landfill leachate treatment. Hydrogen peroxide (HP) and persulfate (PS) were used to generate additional radicals in aerated ZVAl acid process. ZVAl-acid system achieved 83% COD removal efficiency under optimized conditions such as acid washing time of 20 min, ZVAl dose of 10 g L-1 at initial pH 1.5. The highest exclusion efficiencies in terms of TOC, COD as well as color were 83.52%, 96% and 63.71% respectively in treatment systems showing the following order: ZVAl/H+/Air/HP/PS > ZVAl/H+/Air/PS > ZVAl/H+/Air/HP > ZVAl/H+/Air > ZVAl/H+. The involvement of other metals such as Fe and Cu in the process has been found. The reusability study revealed that ZVAl powder can be effectively used up to three cycles. The 28.48 mg/l of Al3+ residue was observed in this process which has to be removed before discharge of effluent. The study indicated that the ZVAl based AOPs is stable and active for the degradation of organic pollutants present in landfill leachate and a promising solution except for the aluminium discharge which has to be given special care.
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Affiliation(s)
- Jismy Antony
- Department of Civil Engineering, National Institute of Technology, Thuvakudi, Tiruchirappalli, Tamil Nadu 620 015, India
| | - S V Niveditha
- Department of Civil Engineering, National Institute of Technology, Thuvakudi, Tiruchirappalli, Tamil Nadu 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Thuvakudi, Tiruchirappalli, Tamil Nadu 620 015, India.
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Thuvakudi, Tiruchirappalli, Tamil Nadu 620 015, India
| | - P V Nidheesh
- CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra 440020, India.
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7
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Niveditha SV, Gandhimathi R. Flyash augmented Fe 3O 4 as a heterogeneous catalyst for degradation of stabilized landfill leachate in Fenton process. Chemosphere 2020; 242:125189. [PMID: 31675578 DOI: 10.1016/j.chemosphere.2019.125189] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 10/11/2019] [Accepted: 10/21/2019] [Indexed: 06/10/2023]
Abstract
In this study magnetite (Fe3O4) was augmented over coal flyash and analyzed for the effectiveness as a catalyst in heterogeneous Fenton process for the degradation of persistent organic pollutant present in stabilized landfill leachate. Fe3O4 and flyash augmented Fe3O4 was prepared by simple chemical precipitation method and both had magnetic nature. XRD, FTIR and SEM with EDX characterization were consummated for both catalysts. The Fenton experiments were performed in batch mode and to identify the optimal operating condition for effective COD removal the leachate pH, catalysts and H2O2 dosages were varied. The reusability of the catalysts was studied. To understand the degradation mechanism adsorption study, Fenton oxidation of benzoic acid and scavenging experiments with KI and NaF were performed. It was witnessed that flyash augmented Fe3O4 exhibited 84.7% of COD degradation which was 12.3% of higher removal efficiency than Fe3O4 at optimum pH 3, 0.05 M H2O2 and 1000 mg/L of catalyst dosage in 100 min reaction time. This flyash augmented Fe3O4 showed 68% of TOC removal and good increment in biodegradability. Poor NH3-N removal was observed in the Fenton treatment process. Decrease in aromaticity was found based on SUVA254 value and also indicated the removal of organic matter. Similarly, reusability and stability were higher than Fe3O4. The results indicate that flyash augmented Fe3O4 is a competent catalyst in heterogeneous Fenton process for treatment of mature leachate. The usage of waste material flyash with Fe3O4 decreases the co-aggregation of Fe3O4 and improves the catalytic performance.
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Affiliation(s)
- S V Niveditha
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India.
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8
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Affiliation(s)
- S. V. Niveditha
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - R. Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
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9
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Pramod L, Gandhimathi R, Lavanya A, Ramesh ST, Nidheesh PV. Heterogeneous Fenton process coupled with microfiltration for the treatment of water with higher arsenic content. CHEM ENG COMMUN 2019. [DOI: 10.1080/00986445.2019.1674814] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- L. Pramod
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - R. Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - Addagada Lavanya
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - S. T. Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamil Nadu, India
| | - P. V. Nidheesh
- CSIR - National Environmental Engineering Research Institute, Nagpur, Maharashtra, India
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10
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Affiliation(s)
- Alphonsa C. Joy
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi Tamil Nadu, India
| | - R. Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi Tamil Nadu, India
| | - S.V. Niveditha
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi Tamil Nadu, India
| | - S. T. Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi Tamil Nadu, India
| | - P. V. Nidheesh
- Environmental Impact and Sustainability Division, CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, India
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11
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Affiliation(s)
- T. Sravanth
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, India
| | - S.T. Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, India
| | - R. Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, India
| | - P. V. Nidheesh
- Environmental Impact Risk Assessment Division, CSIR- National Environmental Engineering Research Institute, Nagpur, India
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12
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Uma V, Gandhimathi R. Organic removal and synthesis of biopolymer from synthetic oily bilge water using the novel mixed bacterial consortium. Bioresour Technol 2019; 273:169-176. [PMID: 30445269 DOI: 10.1016/j.biortech.2018.11.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/31/2018] [Accepted: 11/01/2018] [Indexed: 06/09/2023]
Abstract
Synthetic oily bilge water (OBW) treatment and subsequent production of biopolymer were studied by using a sequential batch reactor (SBR). The effect of various influencing parameters such as solids retention time (SRT), cycle time (CT), substrate concentration, pH level on the organic removal and synthesis of polyhydroxyalkanoates (PHA) was examined by novel soil bacteria isolated from hydrocarbon contaminated site near Karaikal port, India. The isolates were identified as Pseudomonas tuomuerensis and Pseudomonas nitroreducens using 16S rRNA. Sudan Black B staining was performed to visualize the presence of PHA. The experimental results showed that a decrease in substrate concentration to 5000 mg/L of soluble COD (CODs) showed maximum organic removal (81%) and maximum PHA yields of its cell dry mass (81%). The PHA yield was maximum at SRT of 5 d, pH = 7 and CT of 24 h. The produced PHA was characterized by using FTIR, XRD and SEM analysis.
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Affiliation(s)
- V Uma
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu 620 015, India.
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13
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Sruthi T, Gandhimathi R, Ramesh ST, Nidheesh PV. Stabilized landfill leachate treatment using heterogeneous Fenton and electro-Fenton processes. Chemosphere 2018; 210:38-43. [PMID: 29986221 DOI: 10.1016/j.chemosphere.2018.06.172] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 06/27/2018] [Accepted: 06/28/2018] [Indexed: 05/28/2023]
Abstract
In the present study, stabilized landfill leachate treatment by heterogeneous Fenton and electro-Fenton (EF) was carried out. Iron-manganese binary oxide loaded zeolite (IMZ) was used as a catalyst for generating hydroxyl radicals in the acidic medium. Heterogeneous Fenton process was capable of removing 88.6% COD from landfill leachate at the optimal conditions, while 87.5% COD removal was observed at optimal EF treatment conditions. Biodegradability of landfill leachate was increased significantly from 0.03 to 0.52 after Fenton treatment. The prepared heterogeneous catalyst was found reusable with a reduction in COD removal rate. Even though, both the processes are efficient for leachate treatment, the low catalyst dosage requirement in case of EF process justifies that it is more feasible than Fenton process.
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Affiliation(s)
- T Sruthi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India.
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India
| | - P V Nidheesh
- CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, 440020, India.
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14
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Jinisha R, Gandhimathi R, Ramesh ST, Nidheesh PV, Velmathi S. Removal of rhodamine B dye from aqueous solution by electro-Fenton process using iron-doped mesoporous silica as a heterogeneous catalyst. Chemosphere 2018; 200:446-454. [PMID: 29501035 DOI: 10.1016/j.chemosphere.2018.02.117] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Revised: 02/13/2018] [Accepted: 02/19/2018] [Indexed: 06/08/2023]
Abstract
In the current study, Rhodamine B (RhB) dye was removed by electro-Fenton (EF) process using iron-doped SBA-15 (Fe-SBA-15; SBA: Santa Barbara Amorphous) mesoporous silica as a heterogeneous catalyst. This catalyst was prepared with the help of ferric nitrate nonahydrate as a forerunner by wet impregnation method. Various techniques of characterization such as XRD and N2 adsorption-desorption isotherms were performed to confirm the presence of iron particles in the pores of the catalyst. These characterization methods were also used to examine the morphological properties and textural arrangement of the synthesized material. In the batch study of EF process, 750 mL working volume of RhB dye was taken. Anode and cathode used in the process were graphite electrodes respectively with effective area of 25 cm2 each. To maximise the process efficiency, the effect of initial pH, applied voltage, electrode spacing, the concentration of supporting electrolyte and Fe-SBA-15 dosage were investigated and optimized. The optimum conditions obtained were pH of 2, voltage of 8 V, an electrode spacing of 3 cm and Fe-SBA-15 dosage of 15 mg L-1. At the end of 3 h electrolysis, maximum RhB removal of 97.7% and TOC removal of 35.1% were achieved for 10 mg L-1 RhB concentration. In a batch study with real wastewater, 97% of color and 39% of TOC were removed at optimum conditions. Utilization of EF heterogeneous catalyst Fe-SBA-15 is an alternative technique for the elimination of dyes from solution.
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Affiliation(s)
- R Jinisha
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, 620 015, Tamil Nadu, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, 620 015, Tamil Nadu, India.
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, 620 015, Tamil Nadu, India
| | - P V Nidheesh
- CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, India.
| | - S Velmathi
- Department of Chemistry, National Institute of Technology, Tiruchirappalli, 620 015, Tamil Nadu, India
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15
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Nidheesh PV, Khatri J, Anantha Singh TS, Gandhimathi R, Ramesh ST. Review of zero-valent aluminium based water and wastewater treatment methods. Chemosphere 2018; 200:621-631. [PMID: 29510370 DOI: 10.1016/j.chemosphere.2018.02.155] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 02/19/2018] [Accepted: 02/25/2018] [Indexed: 06/08/2023]
Abstract
Zero-valent metals (ZVM) are widely used to remove heavy metals, contaminants, toxicity, etc. from water and wastewater. Zero-valent aluminium (ZVAl) has large surface area and high surface reactivity. It has enormous flexibility for the in-situ application. ZVAl can be applied as either a single or a bimetallic system as well as advanced oxidation processes (AOPs). It is observed that ZVAl is capable of generating hydroxyl and sulfate radicals in water medium, which remove non-biodegradable pollutants from aqueous solution. ZVAl-based processes can remove non-biodegradable organic contaminants from water medium within a short duration. ZVAl is also used as a reducing agent. It is efficient to reduce toxic hexavalent chromium to less toxic trivalent chromium. ZVAl, in various combinations in bimetallic system (Fe/Al, Pd/Al, Cu/Al), is able to remove various contaminants from aqueous medium. Overall, it can be concluded that ZVAl-based methods for water and wastewater treatment are promising environmental technologies.
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Affiliation(s)
- P V Nidheesh
- CSIR-National Environmental Engineering Research Institute, Nagpur, Maharashtra, India.
| | - Jayraj Khatri
- CSIR-National Environmental Engineering Research Institute, Nagpur, Maharashtra, India; Department of Civil Engineering, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India
| | - T S Anantha Singh
- Department of Civil Engineering, School of Technology, Pandit Deendayal Petroleum University, Gandhinagar, Gujarat, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, India
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, India
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16
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Warrier AR, Gandhimathi R. Surface plasmon resonance induced enhancement of photoluminescence and Raman line intensity in SnS quantum dot-Sn nanoparticle hybrid structure. Methods Appl Fluoresc 2018; 6:035009. [PMID: 29633725 DOI: 10.1088/2050-6120/aabcf2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In this article, we report on enhancement in photoluminescence and Raman line intensity of SnS quantum dots embedded in a mesh of Sn nanostructures. SnS nanoparticles synthesized by homogenous precipitation method show strong quantum confinement with a band gap of ∼2.7 eV (blue shift of ∼1 eV compared to bulk SnS particles). The optical band gap of SnS quantum dots is controlled by varying the pH (∼0 to 2.25), ageing time (24 to 144 h) and molarity (0 to 2 M) of the precursors. These SnS nanoparticles are embedded in a mesh of Sn nanostructures which are synthesized from tin chloride by using sodium borohydride as reducing agent. The Sn nanostructures have a morphology dependent, tunable surface plasmon resonance (SPR), ranging from UV (∼295 nm) to visible region (∼400 nm) of the electromagnetic spectrum. In the SnS-Sn nanohybrids, the excitons are strongly coupled with plasmons leading to a shift in the excitonic binding energy (∼400 meV). The pure SnS quantum dots have a very weak photoluminescence peak at ∼560 nm and Raman shift of low intensity at 853.08 cm-1, 1078.17 cm-1, 1255.60 cm-1, 1466.91 cm-1. The coupling of SnS nanoparticles with Sn nanoparticles results in strong exciton-plasmon interactions leading to enhanced photoluminescence and Raman line intensity. The nanohybrids formed using Sn nanosheets whose SPR matches with absorption onset of the SnS nanoparticles shows an enhancement of ∼104 times higher than pure SnS nanoparticles. Thus, Sn nanosheet with surface plasmon resonance in visible region (400 nm) like Au and Ag is a promising material for surface enhanced Raman spectroscopy, plasmon assisted fluorescence imaging and for enhancing the emission intensity of semiconductors with weak emission intensity.
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Affiliation(s)
- Anita R Warrier
- Nanophotonics Research Laboratory, Department of Physics, Academy of Maritime Education and Training, 135, East Coast Road, Kanathur, Chennai-603112, India
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17
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Baiju A, Gandhimathi R, Ramesh ST, Nidheesh PV. Combined heterogeneous Electro-Fenton and biological process for the treatment of stabilized landfill leachate. J Environ Manage 2018; 210:328-337. [PMID: 29367141 DOI: 10.1016/j.jenvman.2018.01.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Revised: 11/29/2017] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
Treatment of stabilized landfill leachate is a great challenge due to its poor biodegradability. Present study made an attempt to treat this wastewater by combining electro-Fenton (E-Fenton) and biological process. E-Fenton treatment was applied prior to biological process to enhance the biodegradability of leachate, which will be beneficial for the subsequent biological process. This study also investigates the efficiency of iron molybdophosphate (FeMoPO) nanoparticles as a heterogeneous catalyst in E-Fenton process. The effects of initial pH, catalyst dosage, applied voltage and electrode spacing on Chemical Oxygen Demand (COD) removal efficiency were analyzed to determine the optimum conditions. Heterogeneous E-Fenton process gave 82% COD removal at pH 2, catalyst dosage of 50 mg/L, voltage 5 V, electrode spacing 3 cm and electrode area 25 cm2. Combined E-Fenton and biological treatment resulted an overall COD removal of 97%, bringing down the final COD to 192 mg/L.
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Affiliation(s)
- Archa Baiju
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India
| | - R Gandhimathi
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India.
| | - S T Ramesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Thuvakudi, Tamil Nadu, 620 015, India
| | - P V Nidheesh
- CSIR- National Environmental Engineering Research Institute, Nagpur, Maharashtra, 440020, India.
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Nidheesh P, Gandhimathi R, Sanjini N. NaHCO3 enhanced Rhodamine B removal from aqueous solution by graphite–graphite electro Fenton system. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2014.06.009] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Nidheesh PV, Gandhimathi R, Velmathi S, Sanjini NS. Magnetite as a heterogeneous electro Fenton catalyst for the removal of Rhodamine B from aqueous solution. RSC Adv 2014. [DOI: 10.1039/c3ra46969g] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Nidheesh PV, Gandhimathi R. Effect of solution pH on the performance of three electrolytic advanced oxidation processes for the treatment of textile wastewater and sludge characteristics. RSC Adv 2014. [DOI: 10.1039/c4ra02958e] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Sathiyanarayanan G, Gandhimathi R, Sabarathnam B, Seghal Kiran G, Selvin J. Optimization and production of pyrrolidone antimicrobial agent from marine sponge-associated Streptomyces sp. MAPS15. Bioprocess Biosyst Eng 2013; 37:561-73. [PMID: 23917410 DOI: 10.1007/s00449-013-1023-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Accepted: 07/22/2013] [Indexed: 12/19/2022]
Abstract
Twenty-nine actinobacterial strains were isolated from marine sponge Spongia officinalis and screened for antagonistic activity against various bacterial and fungal pathogens. The active antibiotic producer MAPS15 was identified as Streptomyces sp. using 16S rRNA phylogenetic analysis. The critical control factors were selected from Plackett-Burman (PB) factorial design and the bioprocess medium was optimized by central composite design (CCD) for the production of bioactive metabolite from Streptomyces sp. MAPS15. The maximum biomass and active compound production obtained with optimized medium was 6.13 g/L and 62.41 mg/L, respectively. The economical carbon source, paddy straw was applied for the enhanced production of bioactive compound. The purified active fraction was characterized and predicted as pyrrolidone derivative which showed broad spectrum of bioactivity towards indicator organisms. The predicted antimicrobial spectra suggested that the Streptomyces sp. MAPS15 can produce a suite of novel antimicrobial drugs.
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Affiliation(s)
- G Sathiyanarayanan
- School of Life Sciences, Bharathidasan University, Tiruchirappalli, 620024, Tamil Nadu, India
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Gandhimathi R, Ramesh ST, Yadu A, Bharathi KS. Fixed bed column study for Cu (II) removal from aqueous solution using water hyacinth (Eichornia crassipes) biomass. J Environ Sci Eng 2013; 55:283-289. [PMID: 25509946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper reports the results of the study on the performance of low-cost biosorbent water hyacinth (WH) in removing Cu (II) from aqueous solution. The adsorbent material adopted was found to be an efficient media for the removal of Cu (II) in continuous mode using fixed bed column. The column studies were conducted with 10 mg/L metal solution with a flow rate of 10 mL/min with different bed depths such as 10, 20 and 30 cm. The column design parameters like adsorption rate constant, adsorption capacity and minimum bed depth were calculated. It was found that, the adsorption capacity of copper ions by water hyacinth increased by increasing the bed depth and the contact time.
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Abstract
The removal of crystal violet from wastewater, by means of bottom ash, was investigated in a packed bed down-flow column. The bed depth service time (BDST) model was used to analyze the experimental data up to breakthrough time (corresponding to C(t)/C(0) = 0.1). A mass transfer model was used to analyze the mass transfer zone. The breakthrough curve was analyzed by the Thomas, Yoon-Nelson, and Clark models. All models fit well with the experimental data. Results showed that as the flow rate increases, at a constant concentration and bed depth, the value of the adsorption capacity of bottom ash decreases. The adsorption capacity of bottom ash decreases with an increase in depth and initial crystal violet concentration. Error analyses were performed for the Thomas, Yoon-Nelson, and Clark models. Water
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Affiliation(s)
- P V Nidheesh
- Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, Tamilnadu, India
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Gandhimathi R, Ramesh S, Arun V, Nidheesh P. Biosorption of Cu(II) and Zn(II) ions from aqueous solution by water hyacinth (Eichhornia crassipes). ACTA ACUST UNITED AC 2013. [DOI: 10.1504/ijewm.2013.054243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gandhimathi R, Dhanasekaran R. Structural, thermal, mechanical and z-scan studies on 4-nitrophenol single crystals. Cryst Res Technol 2011. [DOI: 10.1002/crat.201100510] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Shanmughapriya S, Kiran GS, Selvin J, Gandhimathi R, Baskar TB, Manilal A, Sujith S. Erratum to: Optimization, production, and partial characterization of an alkalophilic amylase produced by sponge associated marine bacterium Halobacterium salinarum MMD047. BIOTECHNOL BIOPROC E 2010. [DOI: 10.1007/s12257-009-1003-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kiran GS, Hema T, Gandhimathi R, Selvin J, Thomas TA, Rajeetha Ravji T, Natarajaseenivasan K. Optimization and production of a biosurfactant from the sponge-associated marine fungus Aspergillus ustus MSF3. Colloids Surf B Biointerfaces 2009; 73:250-6. [DOI: 10.1016/j.colsurfb.2009.05.025] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 04/23/2009] [Accepted: 05/25/2009] [Indexed: 10/20/2022]
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Mohan S, Gandhimathi R. Removal of heavy metal ions from municipal solid waste leachate using coal fly ash as an adsorbent. J Hazard Mater 2009; 169:351-359. [PMID: 19395171 DOI: 10.1016/j.jhazmat.2009.03.104] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2008] [Revised: 03/13/2009] [Accepted: 03/24/2009] [Indexed: 05/27/2023]
Abstract
The purpose of this study was to investigate the possibility of the utilization of coal fly ash as a low cost adsorbent material for the adsorption of heavy metal ions (Zn, Pb, Cd, Mn and Cu) present in the municipal solid waste leachate. Batch experiments were conducted to determine the effect of contact time and fly ash dosage on adsorption of heavy metals. Experimental data were evaluated to find out kinetic characteristics of the adsorption process. The isothermal data could be well described by the Freundlich adsorption model. Kinetic parameters of adsorption such as the pseudo first-order constant, pseudo second-order constant and the intraparticle diffusion rate constant were determined. The fly ash concentration required to achieve maximum heavy metal removal was found to be 2g/L with the removal efficiencies of 39%, 28%, 74%, 42% and 71% for Cu, Mn, Pb, Zn and Cd respectively. The results of the study demonstrated that the fly ash could be used as an effective low cost adsorbent for the removal of heavy metal ions from municipal solid waste leachate.
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Affiliation(s)
- S Mohan
- Environmental and Water Resources Engineering Division, Indian Institute of Technology Madras, Chennai 600036, India.
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Shanmughapriya S, Seghal Kiran G, Selvin J, Gandhimathi R, Bastin Baskar T, Manilal A, Sujith S. Optimization, production, and partial characterization of an alkalophilic amylase produced by sponge associated marine bacterium Halobacterium salinarum MMD047. BIOTECHNOL BIOPROC E 2009. [DOI: 10.1007/s12257-008-0060-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Selvin J, Shanmughapriya S, Gandhimathi R, Seghal Kiran G, Rajeetha Ravji T, Natarajaseenivasan K, Hema TA. Optimization and production of novel antimicrobial agents from sponge associated marine actinomycetes Nocardiopsis dassonvillei MAD08. Appl Microbiol Biotechnol 2009; 83:435-45. [PMID: 19190903 DOI: 10.1007/s00253-009-1878-y] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2008] [Revised: 01/15/2009] [Accepted: 01/15/2009] [Indexed: 11/24/2022]
Abstract
The sponge-associated actinomycetes were isolated from the marine sponge Dendrilla nigra, collected from the southwest coast of India. Eleven actinomycetes were isolated depending upon the heterogeneity and stability in subculturing. Among these, Nocardiopsis dassonvillei MAD08 showed 100% activity against the multidrug resistant pathogens tested. The culture conditions of N. dassonvillei MAD08 was optimized under submerged fermentation conditions for enhanced antimicrobial production. The unique feature of MAD08 includes extracellular amylase, cellulase, lipase, and protease production. These enzymes ultimately increase the scope of optimization using broad range of raw materials which might be efficiently utilized. The extraction of the cell free supernatant with ethyl acetate yielded bioactive crude extract that displayed activity against a panel of pathogens tested. Analysis of the active thin layer chromatography fraction by Fourier transform infrared and gas chromatography-mass spectrometry evidenced 11 compounds with antimicrobial activity. The ammonium sulfate precipitation of the culture supernatant at 80% saturation yielded an anticandidal protein of molecular weight 87.12 kDa. This is the first strain that produces both organic solvent and water soluble antimicrobial compounds. The active extract was non-hemolytic and showed surface active property envisaging its probable role in inhibiting the attachment of pathogens to host tissues, thus, blocking host-pathogen interaction at an earlier stage of pathogenesis.
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Affiliation(s)
- Joseph Selvin
- Department of Microbiology, Bharathidasan University, Tiruchirappalli 620024, India.
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Mohan S, Gandhimathi R. Solid waste characterisation and the assessment of the effect of dumping site leachate on groundwater quality: a case study. ACTA ACUST UNITED AC 2009. [DOI: 10.1504/ijewm.2009.024700] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Shanmughapriya S, Krishnaveni J, Selvin J, Gandhimathi R, Arunkumar M, Thangavelu T, Kiran GS, Natarajaseenivasan K. Optimization of extracellular thermotolerant alkaline protease produced by marine Roseobacter sp. (MMD040). Bioprocess Biosyst Eng 2007; 31:427-33. [PMID: 18071758 DOI: 10.1007/s00449-007-0179-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Accepted: 11/23/2007] [Indexed: 11/25/2022]
Abstract
Marine endosymbiontic Roseobacter sp. (MMD040), which produced high yields of protease, was isolated from marine sponge Fasciospongia cavernosa, collected from the peninsular coast of India. Maximum production of enzyme was obtained in Luria-Bertani broth. Catabolite repression was observed when the medium was supplemented with readily available carbon sources. The optimum temperature and pH for the enzyme production was 37 degrees C and 7.0, respectively. The enzyme exhibited maximum activity in pH range of 6-9 with an optimum pH of 8.0 and retained nearly 92.5% activity at pH 9.0. The enzyme was stable at 40 degrees C and showed 89% activity at 50 degrees C. Based on the present findings, the enzyme was characterized as thermotolerant alkaline protease, which can be developed for industrial applications.
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Affiliation(s)
- S Shanmughapriya
- Department of Microbiology, Bharathidasan University, Tiruchirappalli, India
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