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排序方式: 共有81条查询结果,搜索用时 15 毫秒
61.
Einstein Mariya David Sugantharaj David Madhav Madurantakam Royam Suresh Kumar Rajamani Sekar Bhuvaneshwari Manivannan Swathy Jalaja Soman Amitava Mukherjee Chandrasekaran Natarajan 《Environmental science and pollution research international》2017,24(31):24187-24200
Although the toxicological impact of metal oxide nanoparticles has been studied for the last few decades on aquatic organisms, the exact mechanism of action is still unclear. The fate, behavior, and biological activity of nanoparticles are dependent on physicochemical factors like size, shape, surface area, and stability in the medium. This study deals with the effect of nano and bulk CeO2 particles on marine microcrustacean, Artemia salina. The primary size was found to be 15 ± 3.5 and 582 ± 50 nm for nano and bulk CeO2 (TEM), respectively. The colloidal stability and sedimentation assays showed rapid aggregation of bulk particles in seawater. Both the sizes of CeO2 particles inhibited the hatching rate of brine shrimp cyst. Nano CeO2 was found to be more toxic to A. salina (48 h LC50 38.0 mg/L) when compared to bulk CeO2 (48 h LC50 92.2 mg/L). Nano CeO2-treated A. salina showed higher oxidative stress (ROS) than those treated with the bulk form. The reduction in the antioxidant activity indicated an increase in oxidative stress in the cells. Higher acetylcholinesterase activity (AChE) was observed upon exposure to nano and bulk CeO2 particles. The uptake and accumulation of CeO2 particles were increased with respect to the concentration and particle size. Thus, the above results revealed that nano CeO2 was more lethal to A. salina as compared to bulk particles. 相似文献
62.
P. Suresh S. Ramabalan U. Natarajan 《International Journal of Sustainable Engineering》2016,9(2):107-118
The recent developments in manufacturing organizations recognize sustainability as an important value addition for survival in the competitive scenario. The design engineers are in search of approaches for creating environmental conscious products. The purpose of this paper is to report a research carried out for ensuring sustainable product design by the integration of Design for Environment (DFE) and Design for Manufacture and Assembly (DFMA) methodologies. In this context, this paper reports a case study carried out in an automotive component. The candidate product is the charge alternator pulley. The existing pulley has been created using Computer Aided Design. Then sustainability analysis was conducted on the existing component for determining environmental impact. This is followed by the engineering analysis of the component using ANSYS. Then conceptual design changes were developed in the proposed product using DFMA concept. Then the environmental impact has been evaluated in terms of carbon footprint, energy consumption and air/water impacts on proposed product. It has been found that the optimized pulley design possesses minimal environmental impact. The result of the case study indicated that the integration of DFE and DFMA concept could initiate new developments in sustainable designs with minimal impact to the environment and it also reduces the product cost. 相似文献
63.
Iswarya Velu Palanivel Abirami Chandrasekaran Natarajan Mukherjee Amitava 《Environmental science and pollution research international》2019,26(12):11998-12013
Environmental Science and Pollution Research - In the current study, the effect of different types of titanium dioxide (TiO2) nanoparticles (NPs) (rutile, anatase, and mixture) was analyzed on... 相似文献
64.
Thiagarajan Vignesh Ramasubbu Seenivasan Natarajan Chandrasekaran Mukherjee Amitava 《Environmental science and pollution research international》2019,26(21):21394-21403
Environmental Science and Pollution Research - The use of P25 TiO2 NPs in consumer products, their release, and environmental accumulation will have harmful effects on the coastal ecosystems. The... 相似文献
65.
Kopalakrishnaswami Arjun Singh Loni Reyhaneh Najafi Gholamhassan Natarajan Sendhil Kumar 《Environmental science and pollution research international》2023,30(8):20065-20076
Environmental Science and Pollution Research - Solar parabolic dish concentrator is one of the high-temperature applications of more than 400 °C for thermal and electrical power... 相似文献
66.
Cadle SH Ayala A Black KN Fulper CR Graze RR Minassian F Murray HB Natarajan M Tennant CJ Lawson DR;Coordinating Research Council 《Journal of the Air & Waste Management Association (1995)》2007,57(2):139-145
The Coordinating Research Council held its 16th workshop in March 2006, with 83 presentations describing the most recent mobile source-related emissions research. In this paper, we summarize the presentations from researchers who are engaged in improving our understanding of the contribution of mobile sources to air quality. Participants in the workshop discussed evaluation of in-use emissions control programs, effects of fuels on emissions, emission models and emission inventories, results from gas- and particle-phase emissions studies from spark-ignition and diesel-powered vehicles, and efforts to improve our capabilities in performing on-board emissions measurements, as well as topics for future research. 相似文献
67.
Rameshwar Sankar Sudharsan Sivaprakash Baskaran Rajamohan Natarajan Mohamed Badr A. Vo Dai-Viet N. 《Environmental Chemistry Letters》2023,21(5):2995-3022
Environmental Chemistry Letters - Antibiotic resistance is a major health issue partly caused by the diffusion of antibiotic pollution in the natural environment, thus calling for advanced methods... 相似文献
68.
Extracellular Biopolymer Production by Aureobasidium
pullulans MTCC 2195 Using Jackfruit Seed Powder
Govindasamy Sharmila Chandrasekaran Muthukumaran Godhaviya Nayan Bhagat Nidhi 《Journal of Polymers and the Environment》2013,21(2):487-494
In this present paper, statistical screening and optimization of jackfruit seed powder based medium components were investigated for pullulan production from Aureobasidium pullulans. Seven medium variables jackfruit seed powder, K2HPO4, yeast extract, (NH4)2SO4, NaCl, MgSO4·7H2O and ZnSO4·7H2O were screened by employing Plackett–Burman (PB) method. PB method showed jackfruit seed powder, ZnSO4·7H2O, K2HPO4 and yeast extract were significant. Central composite design of response surface method applied to optimize the significant variables identified from the PB experiment. Statistical analysis of the experimental results showed optimal values were found to be jackfruit seed powder 2 % (w/v), K2HPO4 0.55 % (w/v), yeast extract 0.30 % (w/v) and ZnSO4·7H2O 0.006 % (w/v) with maximum pullulan concentration of 18.76 (g/L). Maximum pullulan concentration of 17.95 (g/L) was observed in the validation experiment. This experimental result explained the model was fitted 96 % as compare with the result predicted by response surface method. 相似文献
69.
Recent advances based on the synergetic effect of adsorption for removal of dyes from waste water using photocatalytic process 总被引:1,自引:0,他引:1
The problem of textile dye pollution has been addressed by various methods,mainly physical,chemical,biological,and acoustical.These methods mainly separate and/or remove the dye present in water.Recently,advanced oxidation processes(AOP)have been focused for removal of dye from waste water due to their advantages such as ecofriendly,economic and capable to degrade many dyes or organic pollutant present in water.Photocatalysis is one of the advance oxidation processes,mainly carried out under irradiation of light and suitable photocatalytic materials.The photocatalytic activity of the photocatalytic materials mainly depends on the band gap,surface area,and generation of electron–hole pair for degradation dyes present in water.It has been observed that the surface area plays a major role in photocatalytic degradation of dyes,by providing higher surface area,which leads to the higher adsorption of dye molecule on the surface of photocatalyst and enhances the photocatalytic activity.This present review discusses the synergic effect of adsorption of dyes on the photocatalytic efficiency of various nanostructured high surface area photocatalysts.In addition,it also provides the properties of the water polluting dyes,their mechanism and various photocatalytic materials;and their morphology used for the dye degradation under irradiation of light along with the future prospects of highly adsorptive photocatalytic material and their application in photocatalytic removal of dye from waste water. 相似文献
70.