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Assessment of soil erosion in the Irga watershed on the eastern edge of the Chota Nagpur Plateau,India

Regional Sustainability 2024年第1期5卷 54-68页

作者： ratan pal Buddhadev HEMBRAM Narayan Chandra JANA Department of Geography the University of BurdwanWest Bengal-713104India

Human activities to improve the quality of life have accelerated the natural rate of soil *** turn,these natural disasters have taken a great impact on *** activities,particularly the conversion of vegetated land into agricultural land and built-up area,stand out as primary contributors to soil *** present study investigated the risk of soil erosion in the Irga watershed located on the eastern fringe of the Chota Nagpur Plateau in Jharkhand,India,which is dominated by sandy loam and sandy clay loam soil with low soil organic carbon(SOC)*** study used the Revised Universal Soil Loss Equation(RUSLE)and Geographical Information System(GIS)technique to determine the rate of soil *** five parameters(rainfall-runoff erosivity(R)factor,soil erodibility(K)factor,slope length and steepness(LS)factor,cover-management(C)factor,and support practice(P)factor)of the RUSLE were applied to present a more accurate distribution characteristic of soil erosion in the Irga *** result shows that the R factor is positively correlated with rainfall and follows the same distribution pattern as the *** K factor values in the northern part of the study area are relatively low,while they are relatively high in the southern *** mean value of the LS factor is 2.74,which is low due to the flat terrain of the Irga *** is a negative linear correlation between Normalized Difference Vegetation Index(NDVI)and the C factor,and the high values of the C factor are observed in places with low *** mean value of the P factor is 0.210,with a range from 0.000 to *** calculating all parameters,we obtained the average soil erosion rate of 1.43 t/(hm^(2)•a),with the highest rate reaching as high as 32.71 t/(hm^(2)•a).Therefore,the study area faces a low risk of soil ***,preventative measures are essential to avoid future damage to productive and constructive activities caused by soil *** study also ident

关键词： Soil erosion Soil organic carbon Rainfall-runoff erosivity factor Soil erodibility factor Slope length and steepness factor Cover-management factor Support practice factor Irga watershed

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Effect of E × B electron drift and plasma discharge in dc magnetron sputtering plasma

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Chinese Physics B 2011年第1期20卷 435-443页

作者： Sankar Moni Borah Arup ratan pal Heremba Bailung Joyanti Chutia Plasma Physics Laboratory Material Sciences DivisionInstitute of Advanced Study in Science and TechnologyPaschim BoragaonGuwahati - 781035AssamIndia

Study of electron drift velocity caused by E ×B motion is done with the help of a Mach probe in a dc cylindrical magnetron sputtering system at different plasma discharge parameters like discharge voltage, gas pressure and applied magnetic field strength. The interplay of the electron drift with the different discharge parameters has been investi- gated. Strong radial variation of the electron drift velocity is observed and is found to be maximum near the cathode and it decreases slowly with the increase of radial distance from the cathode. The sheath electric field, E measured experimentally from potential profile curve using an emissive probe is contributed to the observed radial variation of the electron drift velocity. The measured values of the drift velocities are also compared with the values from the con- ventionM theory using the experimental values of electric and magnetic fields. This study of the drift velocity variation is helpful in providing a useful insight for determining the discharge conditions and parameters for sputter deposition of thin film.

关键词： electron drift velocity Mach probe cylindrical magnetron sputtering

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Synergism of co-delivered nanosized antioxidants displayed enhanced anticancer efficacy in human colon cancer cell lines

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Bioactive Materials 2017年第2期2卷 82-95页

作者： Lipika Ray Manish Kumar pal ratan Singh Ray CSIR-Indian Institute of Toxicology Research P.O.Box No.80M.G.MargLucknowUP226001India Academy of Scientific and Innovative Research New Delhi 110001India

Combination of chemopreventive and/or therapeutic agents is the imminent smart approach to cope upwith cancer because it may act on multiple targets through different pathways. In the present study, wehave synthesized multiple chemopreventive and/or therapeutic agents (Curcumin, Quercetin andAspirin) loaded nanoparticles by simple cation-anion interaction among the amine groups of chitosan(CS) and phosphate groups of sodium hexametaphosphate (SHMP). These nanosized bioactive materials(CS-SHMP-CQA-NPs) were well characterized and found most effective in colon cancer cell line (HCT-116)compared to other cancer cell lines. Triplex chemopreventive and/or therapeutic agents-loaded NPs weresynergistically inducing apoptosis in HCT-116 cells compared to two-chemopreventive agents-loadedNPs as evident by an increase in sub-G1 cells (percent), and chromatin condensation along with thedecrease in mitochondrial membrane potential (MMP). Interestingly, ChoueTalalay analysis revealedthat CS-SHMP-CQA-NPs showed strong synergistic effect in its all doses. Thus, our study demonstratesthat nanoparticles based bioactive materials significantly inhibit the growth of HCT-116 cells and thuscould be a promising approach for colon cancer chemoprevention.

关键词： Chemoprevention Therapeutic agent Colon cancer Synergistic effect Apoptosis

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A perspective on molecular and cellular biology-based developmental toxicology biomarkers

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BIOCELL 2023年第12期47卷 2579-2590页

作者： SUKHENDU DEY SANDIPAN pal APURBA ratan GHOSH palAS SAMANTA Department of Environmental Science The University of BurdwanBurdwanIndia Department of Environmental Science Aghorekamini Prakashchandra MahavidyalayaSubhas NagarIndia Department of Environmental Science Sukanta MahavidyalayaUniversity of North BengalDhupguriIndia

The process of development is intricate and couple-dependent ***,the study of molecular and cellular biology-based developmental toxicology biomarkers increasingly is becoming an important part of risk assessment and management of chemicals for detection of health outcomes and/or biological endpoint like cytotoxicity,cell death,***,the evolution of developmental toxicology field a number of tools/markers have been developed or addressed to deal with developmental outcomes,which can ultimately be used for the development of adverse outcome pathways(AOPs)of developmental *** a result,this paper provides an overview of the current state of developmental toxicology biomarkers and describes the strategies used in the selection and evaluation of such biomarkers in the context of developmental toxicity ***,we discuss about the biological markers that are directly linked to developmental toxicity with respect to future revolutionary ***,this chapter will address different associated outcomes of developmental exposure by intriguing advance *** discussion focuses on the challenges associated with the development of biomarkers for developmental toxicity and highlights some of the recent advances in this ***,the chapter concludes with a brief discussion of the future prospects for the use of molecular and cellular biology-based developmental toxicity *** the present state of the art will provide a succinct summary of recent developments of biomarkers of developmental toxicology.

关键词： Developmental toxicology Biomarkers Adverse outcome pathways

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Integrative assessment of biomarker responses in teleostean fishes exposed to glyphosate-based herbicide(Excel Mera 71)

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Emerging Contaminants 2016年第4期2卷 191-203页

作者： Sukhendu Dey palas Samanta Sandipan pal Aloke Kumar Mukherjee Debraj Kole Apurba ratan Ghosh Ecotoxicology Lab Department of Environmental ScienceThe University of BurdwanGolapbagBurdwan 713104West BengalIndia Division of Environmental Science and Ecological Engineering Korea UniversityAnam-dongSungbuk-guSeoul 02841Republic of Korea Department of Environmental Science Aghorekamini Prakashchandra MahavidyalayaSubhasnagarBengaiHooghly 712611West BengalIndia P.G.Department of Conservation Biology Durgapur Govt.CollegeDurgapur 713214West BengalIndia

Present study deals with the effects of glyphosate-based herbicide,Excel Mera 71 on Anabas testudineus,Heteropnestes fossilis and Oreochromis niloticus in field conditions(1.85 kg/ha)based on anti-oxidative,metabolic and digestive *** this study following biomarkers viz.,acetylcholinesterase(AChE),lipid peroxidation(LPO),catalase(CAT),glutathione-S-transferase(GST),alkaline phosphatase(ALP),aspartate aminotransferase(AST),alanine aminotransferase(ALT),amylase,lipase and protease were investigated in gill,stomach,intestine,liver,kidney,brain,muscle and spinal cord of the concerned fish *** activities were significantly altered by glyphosate exposure after 30 days,these activities were tissue as well as species *** results suggested that these biomarkers could be used to assess the ecological risks of glyphosate on *** factor(BAF)studied in different aquatic natural macrophytes showed order of Alternanthera philoxeroides>Azolla pinnata>Lemna sp.(Minor)>Lemna sp.(Major)>Pistia stratiotes,while transfer factor(TF)showed the order of Pistia stratiotes>Alternanthera philoxeroides>Lemna *** factor(BCF)study showed maximum accumulation of glyphosate in liver,kidney or intestine,and minimum either in bone or stomach irrespective of fish *** integrated biomarker response(IBR),which uses a battery of biomarkers to calculate the standardized scores for each biomarker responses ranging from physiological to biochemical/molecular responses,was evaluated by combining the multiple biomarkers into a single value to evaluate quantitatively the toxicological effects of *** general,the multiple indices exhibited variations and *** was more affected than other fish species;maximum IBR value was observed for LPO and minimum in case of *** order of integrated biomarkers caused by glyphosate treatment was recorded as follows:LPO>Amylase>CAT>AST>Protease>Lipase>ALP>GST>AChE>ALT for ***,LP

关键词： Excel Mera 71 Biomarker Bioaccumulation factor(BAF) Bioconcentration factor(BCF) Transfer factor(TF) Integrated biomarker response(IBR)

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