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- 저자 : Patra, N. (검색결과 157 건)
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Chini Deep Sankar,Mondal Niladri,Kar Avijit,Bunholi Ingrid,Singh Sourav,Ghosh Pratik,Patra Prasanta,Patra Shampa,Patra Bidhan Chandra 한국해양과학기술원 2023 Ocean science journal Vol.58 No.2
Marine fishes are one of the important factors in stabilizing the local aquatic ecosystem and regulating the nutritional socioeconomy of local fisher folks. The recent increases in anthropogenic activity, pollution and overfishing have led to the decline of marine fish species richness and their local aquatic habitats. In this study we sought to determine the inter-relationship between water quality, anthropogenic activity, and fish landing stations through a 31 km stretch of the East Midnapore coast in West Bengal, India which is known for its tourist destinations. The study was conducted monthly on different trawler fish landing sites from Dec 2018 to Dec 2021. During this period, we took fish samples and identified them. We obtained water quality data regarding Sea Surface Temperature (SST), Concentration of Chlorophyll-a (Chl-a), Turbidity, and Dissolved Oxygen (DO) in order to identify further correlation between the water quality analysis and species diversity. 154 numbers of commercially important marine fish species were documented. As per the IUCN database, 13% of the total fish species fall under the red list category and 16% of the species reveal a decreasing population trend. The availability of those red-listed fish throughout the season has been shown in the matrix plot to detect their gradual decrease in sighting. After analyzing the water quality data, we found out that DO, SST, Turbidity, and Chl-a correlate with the species richness on some sites and the water parameters are also differs during the seasons. Both fish species richness and water quality have been affected on those fish landing sites which have been subject to heavy anthropogenic loads.
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Patra, Astam K.,Vo, Nhat Tri,Kim, Dukjoon Elsevier 2017 Applied Catalysis A Vol.538 No.-
<P><B>Abstract</B></P> <P>This work reports on additive-free Ag nanoparticles (4–6nm) deposition on magnetic α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanocrystals surface by the slow reduction of AgNO<SUB>3</SUB> with NaBH<SUB>4</SUB> in aqueous medium. The EDS analysis revealed that the new materials contain 3.93wt% of Ag nanoparticle on the surface of α-Fe<SUB>2</SUB>O<SUB>3</SUB> which are the active suite for hydrogenation reaction. The Ag/Fe<SUB>2</SUB>O<SUB>3</SUB> nanocatalysts exhibited good catalytic ability toward chemoselective hydrogenation of nitroarenes in water. LC–MS study suggested that the catalytic reaction pathway is NO<SUB>2</SUB>, NHOH, NH<SUB>2</SUB> and certainly skips the nitrosoarene intermediate step. The nanocatalysts are very efficient in the hydrogenation of nitroarenes tolerating H, Br, I, OH, OCH<SUB>3</SUB>, COOH and CONH<SUB>2</SUB> functional groups. The nanocatalysts were separated by external magnet and recycled in aqueous medium which offer environmentally and safe approach to this hydrogenation reaction. The catalyst was tested up to 10 recycles and showed no significant loss of catalytic activity.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly efficient Ag nanoparticles incorporated magnetic α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanocatalyst were developed by simple method. </LI> <LI> 4–6nm Ag nanoparticles on the surface of α-Fe<SUB>2</SUB>O<SUB>3</SUB> are the active suite for the high catalytic activity. </LI> <LI> LC–MS study suggested that the catalytic reaction pathway is NO<SUB>2</SUB>, NHOH, NH<SUB>2</SUB> and certainly skips the nitrosoarene intermediate step. </LI> <LI> The nanocatalyst are very efficient in the hydrogenation of nitroarenes tolerating H, Br, I, OH, OCH<SUB>3</SUB>, COOH, and CONH<SUB>2</SUB> functional groups in water. </LI> <LI> High catalytic activity and excellent recyclability and can be separated by external magnet and no significant loss of catalytic activity after 10 recycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Patra, A.K.,Sharma, K.,Dutta, Narayan,Pattanaik, A.K. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.12
This study was conducted to examine the effect of Leucaena leucocephala-Morus alba-Azadirachta indica (2:1:1) based leaf meal mixture as nitrogen source to partially replace (50%) soybean meal in conventional supplements on the performance of goats. Twelve non-descript female goats were divided into two equal groups in a completely randomized design to receive either the leaf meal mixture based supplement (LMAM) or soybean meal incorporated concentrate (SBM) and wheat straw for ad libitum intake for a two month period. The goats given LMAM and SBM concentrate had similar dry matter intake ($50.2{\pm}1.67g/kg\;W^{0.75}$) and nutrient digestibility. Nitrogen intake and its faecal and urinary excretion were similar irrespective of diets. The balance of nitrogen was positive and comparable ($1.63{\pm}0.08g/d$) in both dietary treatments. The plane of nutrition on both diets was comparable and the digestible crude protein and total digestible nutrients values of the composite diets offered did not differ significantly between the dietary supplements. The serum concentration of enzymes alanine aminotransferase and aspartate aminotransferase were statistically similar in both the groups, while haemoglobin and serum urea levels were significantly (p<0.05) higher in LMAM and SBM treatments, respectively. It was concluded that the leaf meal mixture of Leucaena leucocephala-Morus alba-Azadirachta indica could be used as a vegetable protein supplement to wheat straw based diet of goats.
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Patra, J.K.,Baek, K.H. Elsevier Sequoia 2017 Journal of photochemistry and photobiology. B, Bio Vol.173 No.-
In this study, a simple, rapid, and eco-friendly green method was introduced to synthesize magnetite iron oxide nanoparticles (Fe<SUB>3</SUB>O<SUB>4</SUB> NPs) using the aqueous extracts of two food processing wastes, namely silky hairs of corn (Zea mays L.) and outer leaves of Chinese cabbage (Brassica rapa L. subsp. pekinensis). The boiled solutions of silky hairs (MH) and outer leaves of Chinese cabbage (CCP) were used to synthesize Fe<SUB>3</SUB>O<SUB>4</SUB> NPs under photo exposed condition. The MH-FeNPs and CCP-FeNPs synthesized via green route were characterized by UV-Vis spectroscopy, field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), differential thermogravimetric (TG/DTG) analysis, and vibrating sample magnetometer (VSM) analysis. The UV-Visible spectra displayed two absorption bands at 325nm and 375mm for the MH-FeNPs, and 325mm and 365mm for the CCP-FeNPs, respectively. The estimated absolute crystallite sizes of the MH-FeNPs and CCP-FeNPs were calculated to be 84.81 and 48.91nm, respectively. VSM analysis revealed that both FeNPs were superparamagnetic in nature. Both FeNPs mixed with kanamycin and rifampicin displayed positive synergistic antibacterial activity against pathogenic foodborne bacteria (9.36-24.42mm inhibition zones), and those mixed with amphotericin b also exerted synergistic anticandidal activity against five different pathogenic Candida species (9.81-17.68mm inhibition zones). Both FeNPs exhibited strong antioxidant activities; therefore, all the properties of the green synthesized MH-FeNPs and CCP-FeNPs using food processing wastes could be beneficial for their potential applications in various fields such as drug delivery, antibacterial and anticandidal drugs, and biomedical fields.
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Patra, Dhananjaya,Lee, Jaehyuk,Lee, Jongbok,Sredojevic, Dusan N.,White, Andrew J. P.,Bazzi, Hassan S.,Brothers, Edward N.,Heeney, Martin,Fang, Lei,Yoon, Myung-Han,Al-Hashimi, Mohammed The Royal Society of Chemistry 2017 Journal of materials chemistry. C, Materials for o Vol.5 No.9
<P>New low band gap copolymers P1-P4, based on thienylenevinylene (TV) and pyrrolo[3,2-d:4,5-d']bisthiazole (PBTz) units composed of different alkyl side chains, such as 2-octyldodecyl (OD), n-hexadecyl (HD), 2-ethylhexyl (EH), and 9-heptadecyl (HD) groups, respectively, have been synthesized and characterized. Electrochemical and optical studies of the copolymers indicated low energy band gaps in the range of 1.40-1.47 eV. Moreover, theoretical calculation with density functional theory (DFT) and time-dependent DFT calculations demonstrated that the energy band gaps, HOMO energy levels and maximum absorption values in the copolymers were in good agreement with the experimental results. The decomposition temperature of all copolymers was measured to be above 340 degrees C by thermogravimetric analysis (TGA), which indicates high thermal stability. Thermally annealed OTFT devices based on P1-P4 thin films demonstrated a range of hole mobilities; thus, the P2 based OTFT device exhibited the highest hole mobility of 0.062 cm(2) V-1 s(-1).</P>
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Patra, A.,Kundu, S.,Bhaumik, A.,Kim, D. Royal Society of Chemistry 2016 Nanoscale Vol.8 No.1
<P>We have developed a new green chemical approach for the shape-controlled synthesis of single-crystalline hematite nanocrystals in aqueous medium. FESEM, HRTEM and SAED techniques were used to determine the morphology and crystallographic orientations of each nanocrystal and its exposed facets. PXRD and HRTEM techniques revealed that the nanocrystals are single crystalline in nature; twins and stacking faults were not detected in these nanocrystals. The structural, vibrational, and electronic spectra of these nanocrystals were highly dependent on their shape. Different shaped hematite nanocrystals with distinct crystallographic planes have been synthesized under similar reaction conditions, which can be desired as a model for the purpose of properties comparison with the nanocrystals prepared under different reaction conditions. Here we investigated the photocatalytic performance of these different shaped-nanocrystals for methyl orange degradation in the presence of white light (lambda > 420 nm). In this study, we found that the density of surface Fe3+ ions in particular facets was the key factor for the photocatalytic activity and was higher on the bitruncated-dodecahedron shape nanocrystals by coexposed {104}, {100} and {001} facets, attributing to higher catalytic activity. The catalytic activity of different exposed facet nanocrystals were as follows: {104} + {100} + {001} (bitruncated-dodecahedron) > {101} + {001} (bitruncated-octahedron) > {001} + {110} (nanorods) > {012} (nanocuboid) which provided the direct evidence of exposed facet-driven photocatalytic activity. The nanocrystals were easily recoverable using an external magnet and reused at least six times without significant loss of its catalytic activity.</P>
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Patra, Nabanita,De, Umasankar,Kang, Jin-Ah,Kim, Ji Mim,Ahn, Mee Young,Lee, Jaewon,Jung, Jee H.,Chung, Hae Young,Moon, Hyung Ryong,Kim, Hyung Sik Elsevier 2011 european journal of pharmacology Vol.658 No.2
<P><B>Abstract</B></P><P>Here, we reported the synthesis of a novel topoisomerase II inhibitor, MHY336, which that has strong topoisomerase-mediated anticancer activity but fewer side effects than other topoisomerase II inhibitors. The catalytic activity of MHY336 on the topoisomerase II enzyme was the same as that of the etoposide. In a cell-free system, MHY336 exhibited a potent activity on scavenging of reactive oxygen species against 3-morpholinosydnonimine hydrochloride (SIN-1)-induced oxidative stress. An <I>in vitro</I> cell-based assay demonstrated that MHY336 significantly inhibited the proliferation of three prostate cancer cell lines, LNCaP, PC-3, and DU145 cells. Notably, the cytotoxicity of MHY336 was more potent in LNCaP cells (IC<SUB>50</SUB>=1.39μM) than in DU145 (IC<SUB>50</SUB>=2.94μM) and PC3 cells (IC<SUB>50</SUB>=3.72μM). Furthermore, MHY336 treatment induced similar levels of cytotoxicity compared to doxorubicin treatment (IC<SUB>50</SUB>=1.55μM) in LNCap cells. Also, MHY336 significantly down-regulated topoisomerase II alpha expression and up-regulated p53 expression in LNCaP cells (wild-type p53), whereas it up-regulated the topoisomerase II alpha protein in both DU145 and PC3 cells (p53 mutated or deleted). MHY336 induced G2/M or S phase arrest in LNCaP cells through a well-documented topoisomerase II-dependent mechanism. Further studies using Annexin V-FITC binding assay, DAPI staining, and Western blot analyses illustrated that MHY336 markedly induced apoptotic cell death via the mitochondria-mediated intrinsic pathway in LNCaP cells. These results suggest that MHY336 is an attractive chemotherapeutic agent because of its topoisomerase II-mediated anti-tumour activity in human prostate cancer.</P>
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Patra, Rakesh Kumar,Mukharjee, Bibhuti Bhusan Techno-Press 2016 Advances in concrete construction Vol.4 No.4
Several types of industrial byproducts are generated. With increased environmental awareness and its potential hazardous effects, the utilization of industrial byproducts in concrete has become an attractive alternative to their disposal. One such by-product is ground granulated blast furnace slag (GGBS), which is a byproduct of the smelting process carried out in the iron and steel industry. The GGBS is very effective in the design and development of high-strength and high-performance concrete. This paper reviews the effect of GGBS on the workability, porosity, compressive strength, splitting tensile strength, and flexural strength of concrete.
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