Arup Roy
@xim.edu.in
Assistant Professor and School of Sustainability
XIM University
RESEARCH, TEACHING, or OTHER INTERESTS
Multidisciplinary, Environmental Engineering, Economics, Econometrics and Finance, Renewable Energy, Sustainability and the Environment
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ranjan DasGupta and Arup Roy
Elsevier BV
Ranjan DasGupta and Arup Roy
University of New Haven - College of Business
In this study, we have examined two specific research questions. First, whether firms around the world with negative performance feedback would resort to more environmental, social, governance [ESG] performance or otherwise. Second, we examine whether firms’ ESG controversies and stakeholder orientation in a cross-country context, with distinctive legal system and ethical behaviour, would motivate them to undertake more ESG performance in such negative performance feedback conditions. Our primary findings show that negative performance feedback of a firm impacts its ESG performance in a strongly negative manner. Furthermore, we prove that both high stakeholder orientation and high ESG controversies significant negatively moderate firms’ ESG inclinations. This holds true irrespective of country-specific legal system and ethical behaviour contexts.
Arup Roy
Emerald
Purpose Globally, India ranks third in greenhouse gas (GHGs) emissions. Decarbonizing India's economy would necessitate significant changes in how the country generates energy, manufactures things, delivers services and manages natural resources. Recently, scholars from different parts of the world have used various indicators like carbon and methane emissions to investigate potential solutions to the global warming problem that has resulted in climate change. Therefore, this study aims to investigate the impact of foreign direct investment, renewable and non-renewable energy consumption, in addition to economic growth, trade openness, and natural resources on ecological footprint. Design/methodology/approach Using India's yearly data from 1990 to 2016, this research investigates the impact of direct foreign investment (FDI), trade (TA) and natural resources (NR) on the ecological footprint (EF) within the framework of economic growth (GDP), renewable (RE) and non-renewable (NRE) energy consumption. The Zivot–Andrews unit root approach was used to examine the structural breaks in data series and the presence of stationary. An auto regressive distributive lag model was used to investigate the presence of long-run and short-run dynamic relationships among the variables. Findings The empirical findings demonstrate that FDI, RE and GDP have a negative and substantial impact on EF in the long term; in contrast, NRE and TA are significant and positive. The Granger causality test indicates that feedback transmission was observed between NR and EF and TA and EF. One-way causation passed from GDP to FDI and NR; TA to FDI and RE. Originality/value Indian Government and authorities should push for an eco-friendly manufacturing process and technology adaptation to improve environmental quality.
Ranjan DasGupta and Arup Roy
Elsevier BV
Arup Roy
Institution of Engineering and Technology (IET)
The synthesis of mesoporous γ-Fe2O3 nanoparticles by eco-friendly one-step microwave irradiation method in ambient atmospheres without surfactants as described in this Letter. Characterisation of synthesised nanoparticles was performed by X-ray diffraction, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area & pore volume analyser, field emission scanning electron microscopy, high-resolution transmission electron microscopy, and superconducting quantum interference device. The adsorption behaviour of nanoparticles towards methyl orange, an azo dye, was examined in aqueous solutions under various operational conditions like pH, temperature, contact time, and adsorbent weight. Results suggest that as-synthesised γ-Fe2O3 nanoparticles are mesoporous and superparamagnetic at room temperature. Some characteristics of γ-Fe2O3 nanoparticles, for example, saturation magnetisation, pore diameters, specific surface areas, and pore volumes are 72.0 emu g−1, 7.11 nm, 189.35 m2 g−1, and 0.52 cm3 g−1, respectively. The experimental data of adsorption study fitted with the Langmuir isotherm model and maximum adsorption capacity is 403.23 mg g−1. The reusability of the γ-Fe2O3 nanomaterials was examined, and it can be recycled for ten cycles. In sum, this simple eco-friendly synthesis method of magnetic mesoporous adsorbent is suitable for large scale production without any template or surfactant or inert atmosphere.
Gracy Laldinmawii, KhSulochana Devi, SNongthon Singh, Paotinlal Haokip, Arup Roy, and Shan Damrolien
Medknow
Background: Microorganisms growing in a biofilm are associated with chronic, recurrent infections, and health problems for patients with indwelling devices which are difficult to treat with antimicrobial agents. Staphylococcus species are the most common microorganisms isolated from these patients. This study was conducted to detect biofilm production in Staphylococcal isolates from orthopedic device-related infections (ODRI) and chronic osteomyelitis (CO) and correlation of antimicrobial susceptibility pattern between biofilm producers and nonbiofilm producers. Materials and Methods: A cross-sectional study was carried out at the Department of Microbiology in a tertiary care center after the Institutional Ethics Committee approval, from October 2014 to September 2016. Detection of biofilm was performed by Congo Red Agar (CRA), tube method (TM), and tissue culture plate (TCP) methods. Antimicrobial susceptibility test was performed by Kirby–Bauer disk diffusion method, and minimum inhibitory concentration for oxacillin and vancomycin was determined according to the Clinical Laboratory Standard Institute guidelines. Results: A total of 51 clinical isolates, consisting of 45 Staphylococcus aureus and 6 coagulase-negative Staphylococci (CoNS), were isolated from 47 CO and 4 ODRI patients of which 32 were methicillin-resistant S. aureus and 2 MRCONS. Biofilm production was detected in 22 isolates by TCP, 18 by TM, and 13 by CRA methods. Fifty percent ODRI isolates and 42.5% CO isolates were biofilm producers. The biofilm producers have lower antimicrobial sensitivity pattern in all except vancomycin. Conclusion: Biofilm producers were detected from 43.1% of total isolates with higher antimicrobial resistance pattern.
Paotinlal Haokip, HeigrujamRebachandra Singh, Gracy Laldinmawii, ElimK Marak, and Arup Roy
Medknow
Background: While the CD4 cell count plays a pivotal role for antiretroviral therapy (ART) initiation, plasma viral load (PVL) provides additional guiding information, especially in patients with a relatively high CD4 cell count. This study was carried out to quantify PVL and CD4 cell count in ART naïve cases and determine their correlation. Materials and Methods: A cross-sectional study was conducted on 82 ART naïve patients of ≥15 years of age attending the Fluorescent Activated Cell Sorter Count (FACSCount) center, Department of Microbiology at a tertiary care center after the Institutional Ethics Committee approval, from August 2014 to November 2015. Blood samples were collected after obtaining written informed consent. PVL was quantified by COBAS® TaqMan® human immunodeficiency virus type 1 (HIV-1) version 2.0 Test and CD4 cell count was measured by FACSCountTM System. The correlation analysis was performed by Pearson's correlation test (r) using SPSS 16.0 software. Results: In this study, mean PVL and CD4 cell counts were 108,000 ± 206,200 copies/mL and 348.2 ± 296 cells/μL, respectively. Among those with PVL ≥50,000 copies/mL, CD4 cell count was >350 cells/μL in 10.4%. PVL was not detectable in 8.5%. There was significant negative correlation (r = −0.54, P < 0.00) between PVL and CD4 cell count in ART naïve patients. Conclusion: Consideration of PVL in ART initiation guidelines for those with CD4 cell count >350 cells/μL will maximize ART coverage of highly infectious ART naïve patients, which in turn will reduce the risk of HIV transmission at individual and population level.
Arup Roy and Jayanta Bhattacharya
Elsevier BV
Arup Roy, Samiran S. Gauri, Madhusmita Bhattacharya, and Jayanta Bhattacharya
American Scientific Publishers
The high degree of microbial diseases and their multidrug resistant properties make the researchers to develop new class of antimicrobial agents. A modern and innovative approach of drug development is the use of metallic nanoparticles as new formulations of antimicrobial agents. In this study, microwave irradiated CaO nanoparticles (CaO-NPs) were used to determine their antimicrobial efficacy against gram negative and gram positive bacteria, as well as pathogenic yeast. The physiochemical properties of CaO-NPs were characterized by means of X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The nanoparticles consist of well dispersed agglomerates of grains with a narrow size distribution of 14-24 nm. The prepared CaO-NPs showed much higher antimicrobial activity against Pseudomonas aeruginosa (ATCC 27853) and Staphylococcus epidermidis (MTCC 435) in comparision to Candida tropicalis (NCIM 3110). The minimum inhibitory concentration (MIC) value of CaO-NPs was found within the range of 2-8 mM for all the above tested strains. This bioactive nanoparticle also inhibits the biofilm formation and may have future applications cheap and non toxic as antimicrobial drug for skin care product development.
Arup Roy and Jayanta Bhattacharya
Elsevier BV
ARUP ROY and JAYANTA BHATTACHARYA
World Scientific Pub Co Pte Lt
CaS nanoparticles have been synthesized by microwave irradiation, using Ca(Ac)2 as Ca -precursor, and thioacetamide as S -source. The as-prepared sample has a uniform morphology and high purity. After heat treatment similar results were observed. Synthesized nanoparticles were characterized by X-ray powder analysis (XRD), field emission scanning microscopy (FESEM), high resolution transmission electron microscopy (TEM), and UV-Vis absorption spectroscopy. X-ray diffraction patterns suggest the formation of single cubical face of CaS having average particle size of 22 nm. HRTEM micrographs reveal well dispersed cubical morphology with a size distribution of 18–30 nm. Ultraviolet-visible (UV-Vis) spectroscopy shows absorption at 268 nm. In nutshell, microwave irradiation is proved to be a convenient, efficient and environmental-friendly one-step route to synthesize nanoparticles.
Arup Roy, Bidus Kanti Das, and Jayanta Bhattacharya
Springer Science and Business Media LLC
ARUP ROY and JAYANTA BHATTACHARYA
World Scientific Pub Co Pte Lt
Calcium oxide ( CaO ) is an important inorganic compound, which is used across various industries as catalyst, toxic-waste remediation agent, adsorbent, etc. CaO nanoparticles were obtained by the microwave irradiation technique, using Ca(NO3)2 ⋅ 4H2O and NaOH as starting materials. The formation of monocrystalline CaO nanoparticles was confirmed by the XRD (X-ray diffraction) and TEM (transmission electron microscopy) as well as by SAED (selected area electron diffraction) analysis. The structure of the CaO nanocrystal was found to be cubic with particle size, 24 nm and surface area, 74 m2/g.
Anupam Ghosh, Bidus Kanti Das, Arup Roy, and Goutam Chandra
Informa UK Limited
In in vitro screenings of antibiotics against the two most commonly found opportunistic bacteria related to epizootic ulcerative syndrome of fishes—Aeromonas hydrophila (MTCC 646) and Pseudomonas fluorescens (MTCC 103)—gentamycin, ofloxacin, kanamycin, and tobramycin were effective. The antibacterial screening of plant extracts revealed that both aqueous and methanolic extract of Terminalia chebula, Polyalthia longifolia, Terminalia bellerica, and Phyllanthus emblica were sensitive against the bacterial strains. Methanolic extracts of all the plant species demonstrated higher antibacterial property than the hot aqueous extracts.
A. Roy and J. Bhattacharya
Institution of Engineering and Technology (IET)
This Letter reports a process of preparation and characterisation of Ca(OH) 2 nanoparticles without using any surfactant. Ca(OH) 2 is frequently used as precipitant, catalyst, paint, toxic-waste remediation agent, adsorbent and so on. To prepare stable Ca(OH) 2 nanoparticles, a simple hydrolysis method was applied using Ca(NO 3 ) 2 ·4H 2 O as the precursor, aqueous NaOH as the precipitant and ethane-1,2-diol (ED) as the medium. The nanoparticles were characterised by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, high-resolution transmission electron microscope (HRTEM) and field emission scanning electron microscopy (FESEM). The results showed that the nanoparticles are of about 47 nm in diameter and P3m1 hexagonal structure. The method is simple and effective so that nanoparticles are stable up to 45 days, confirmed by the XRD pattern.
Young Wook Cheong, Bidus Kanti Das, Arup Roy, and Jayanta Bhattacharya
Springer Science and Business Media LLC
Bidus Kanti Das, Arup Roy, Soumitra Singh, and Jayanta Bhattacharya
Springer Science and Business Media LLC
Bidus Kanti Das, Arup Roy, Matthias Koschorreck, Santi M. Mandal, Katrin Wendt-Potthoff, and Jayanta Bhattacharya
Elsevier BV
Anupam Ghosh, Bidus Kanti Das, Arup Roy, Biplab Mandal, and Goutam Chandra
Springer Science and Business Media LLC