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- 검색키워드
- 저자 : Pant, T. K. (검색결과 191 건)
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Pant, Bishweshwar,Pant, Hem Raj,Barakat, Nasser A.M.,Park, Mira,Jeon, Kyungsoo,Choi, Yuri,Kim, Hak-Yong Elsevier 2013 CERAMICS INTERNATIONAL Vol.39 No.6
<P><B>Abstract</B></P> <P>A novel photocatalytic and antibacterial carbon nanofiber decorated with TiO<SUB>2/</SUB>ZnO composite NPs was prepared by a simple electrospinning method followed by calcination and hydrothermal treatment. The loading of a small amount of ZnO NPs throughout the fibers prior to electrospinning could provide nucleation sites for the crystal growth of ZnO from its precursor during hydrothermal synthesis and could effectively hold TiO<SUB>2</SUB>/ZnO particles on the surface of the fibers for better stability. The morphology and structure of the as-synthesized particles were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy, which revealed that TiO<SUB>2</SUB>/ZnO NPs were attached on the surface of the carbon nanofibers. The as-synthesized nanocomposite exhibited a strong photocatalytic activity for the decomposition of methylene blue (MB) under UV irradiation and showed good antibacterial properties as well. The enhanced photocatalytic performance of the developed nanocomposite can be attributed to the adsorption characteristic of carbon nanofiber and the matched band potentials of TiO<SUB>2</SUB> and ZnO. The perfect recovery of the catalyst after the reaction and its unchanged efficiency for cyclic use showed that it will be an economical and environmentally friendly photocatalyst.</P>
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Plastic bottle feeding produces changes in biochemical parameters in human infants – A pilot study
Pant Mahendra K.,Ahmad Abul. H.,Naithani Manisha,Pant Jayanti 대한소아청소년과학회 2022 Clinical and Experimental Pediatrics (CEP) Vol.65 No.9
Background: Plastic bottles are widely used by people to feed their infants when breastfeeding is not possible. Bisphenol A (BPA), an endocrine disruptor is widely used in the manufacturing of plastic wares and is leached out from these plastic wares on exposure to high temperature, changed pH, or cleaning the plastic wares by harsh detergents.Purpose: Feeding through plastic bottles over prolong duration is expected to expose the infants to leached BPA. Hence the present study was taken up to compare the effects of breastfeeding and plastic bottle feeding on biochemical parameters in infants and also detect for the presence of free BPA or its metabolite in the infants.Methods: Biochemical tests like lipid profile, liver function tests, creatine-kinase–MB (CK-MB), serum urea, serum electrolytes were performed on blood samples obtained from infants who were breastfed and plastic bottle fed. Further, plasma and urine samples of the infants were subjected to Liquid chromatography-mass spectrometry analysis for detecting free BPA and BPA glucuronide.Results: Biochemical changes in form of raised triglycerides, cholesterol, low-density lipoproteins, very low-density lipoproteins and increase in CK-MB, serum urea were observed in plastic bottle fed infants. BPA glucuronide was also detected in the urine of these infants. Free BPA was not detected in plasma or urine samples of the infants except in one plasma sample from bottle-fed group.Conclusion: Plastic bottle feeding may lead to toxic changes in the functioning of organs which manifest as altered biochemical parameters.
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Pant, Bishweshwar,Pant, Hem Raj,Park, Mira,Liu, Yanan,Choi, Ja-Wun,Barakat, Nasser A.M.,Kim, Hak-Yong Elsevier 2014 CATALYSIS COMMUNICATIONS - Vol.50 No.-
CdS/TiO2 NPs-decorated carbon nanofibers were introduced as a novel photocatalyst working under visible light radiation for the effective hydrolytic dehydrogenation of ammonia borane. Calcination of electrospun nanofiber mats composed of titanium tetraisopropoxide, poly (vinyl pyrrolidone) (PVP), and cadmium acetate dihydrate with a few drops of ammonium sulfide in argon atmosphere at 850 degrees C led to the production of CdS-TiO2 decorated carbon nanofibers. As-synthesized nanocomposite exhibited a strong photocatalytic activity for catalytic hydrolysis of ammonia-borane. The favorable electrons-transfer properties, better dispersion, high surface area, and adsorption property are the main features of nanocomposites that exhibit high catalytic efficiency. (C) 2014 Elsevier B.V. All rights reserved.
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Pant, H.R.,Kim, H.J.,Joshi, M.K.,Pant, B.,Park, C.H.,Kim, J.I.,Hui, K.S.,Kim, C.S. Elsevier Scientific Pub. Co 2014 Journal of hazardous materials Vol.264 No.-
A stable silver-doped fly ash/polyurathene (Ag-FA/PU) nanocomposite multifunctional membrane is prepared by a facile one-step electrospinning process using fly ash particles (FAPs). Colloidal solution of PU with FAPs and Ag metal precursor was subjected to fabricate nanocomposite spider-web-like membrane using electrospinning process. Presence of N,N-dimethylformamide (solvent of PU) led to reduce silver nitrate into Ag NPs. Incorporation of Ag NPs and FAPs through electrospun PU fibers is proven through electron microscopy and spectroscopic techniques. Presence of these NPs on PU nanofibers introduces several potential physicochemical properties such as spider-web-like nano-neeting for NPs separation, enhanced absorption capacity to remove carcinogenic arsenic (As) and toxic organic dyes, and antibacterial properties with reduce bio-fouling for membrane filter application. Preliminary observations used for above-mentioned applications for water treatment showed that it will be an economically and environmentally friendly nonwoven matrix for water purification. This simple approach highlights new avenues about the utilization of one pollutant material to control other pollutants in scalable and inexpensive ways.
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Pant, Hem Raj,Bajgai, Madhab Prasad,Nam, Ki Taek,Seo, Yun A.,Pandeya, Dipendra Raj,Hong, Seong Tshool,Kim, Hak Yong Elsevier 2011 Journal of hazardous materials Vol.185 No.1
<P><B>Abstract</B></P><P>In this study, electrospun nylon-6 spider-net like nanofiber mats containing TiO<SUB>2</SUB> nanoparticles (TiO<SUB>2</SUB> NPs) were successfully prepared. The nanofiber mats containing TiO<SUB>2</SUB> NPs were characterized by SEM, FE-SEM, TEM, XRD, TGA and EDX analyses. The results revealed that fibers in two distinct sizes (nano and subnano scale) were obtained with the addition of a small amount of TiO<SUB>2</SUB> NPs. In low TiO<SUB>2</SUB> content nanocomposite mats, these nanofiber weaves were found uniformly loaded with TiO<SUB>2</SUB> NPs on their wall. The presence of a small amount of TiO<SUB>2</SUB> NPs in nylon-6 solution was found to improve the hydrophilicity (antifouling effect), mechanical strength, antimicrobial and UV protecting ability of electrospun mats. The resultant nylon-6/TiO<SUB>2</SUB> antimicrobial spider-net like composite mat with antifouling effect may be a potential candidate for future water filter applications, and its improved mechanical strength and UV blocking ability will also make it a potential candidate for protective clothing.</P>
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Pant Nitesh,Noh HyeongJin,Lee Won-Ho,Kim Seong Hwan 한국균학회 2023 Mycobiology Vol.51 No.2
Auricularia is one of the broadly cultivated edible mushrooms in Korea. Most of the Korean Auricularia strains used for cultivation and breeding are known as A. auricula-judae. Recently, this species has been reported to belong to a species complex. Therefore, this study was carried out to genetically clarify the bred and cultivated Korean A. auricula-judae strains. The internal transcribed spacer (ITS) and IGS1 rDNA region sequences were determined from 10 A. auricula-judae strains by PCR and sequencing. Variation in the nucleotide sequence and sequence length of the two rDNA regions were found among the seven A. auricula-judae strains. A maximum-likelihood (ML) phylogenetic tree based on the ITS sequences clearly placed all the 10 Korean A. auricula-judae strains in the A. heimuer clade of the A. auricula-judae complex. A. heimuer is diverged from A. auricula-judae. An ML phylogenetic tree based on the IGS1 sequences revealed the close relationship between Korean A. heimuer strains to Chinese A. heimuer strains. But each strain could be distinguishable by the IGS1 sequence. Furthermore, progeny strains in the seven Korean strains could be differentiated from their parental strains by the IGS1 sequence based phylogenetic tree. Our results are expected to be used to complement the distinction of domestic Auricularia cultivars.
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Pant, Bishweshwar,Park, Mira,Kim, Hak-Yong,Park, Soo-Jin Elsevier Sequoia 2016 Synthetic metals Vol.220 No.-
<P><B>Abstract</B></P> <P>In this study, a novel photocatalytic and antibacterial Ag-ZnO decorated carbon fiber composite was synthesized by a simple electrospinning method followed by the hydrothermal treatment. Aqueous suspension containing Ag and ZnO precursors with the carbon nanofibers was kept in the hydrothermal process at 140°C for 2h to obtain a homogenous distribution of Ag-ZnO NPs throughout the surface of carbon fibers. The studies of the photocatalytic degradation of methylene blue (MB) and antibacterial performance against Escherichia coli <I>(E. coli)</I> indicated that the as-synthesized composites show enhanced adsorption, visible-light-driven photocatalytic, and antibacterial properties than that of pristine ZnO particles. Therefore, this work provides a facile method of the preparation of carbon fiber based composites which may have potential applications in the environmental fields.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag-ZnO NPs decorated carbon nanofibers were successfully prepared. </LI> <LI> It exhibited a strong photocatalytic and antibacterial activities. </LI> <LI> It can be considered as a cheap and effective material for wastewater treatment. </LI> </UL> </P>
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Pant, Nirdosh Kumar,Pandey, Kailash Chandra,Madabhavi, Irappa,Pandey, Vinod,Revannasiddaiah, Swaroop Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18
Background: Tobacco products continue to be used in large quantities in India despite the mandatory inclusion of pictorial health warnings (PHWs) on all tobacco packaging. The circumstances as to how people could continue the use of tobacco to the point of developing head and neck cancer despite enhanced awareness about the ill effects of tobacco is the main focus of this study. Materials and Methods: This study concerned patients with least 5-years history of tobacco use, having been diagnosed with histopathologically proven malignancies of the hypopharynx, larynx, oropharynx and oral cavity presenting at the Government Medical College-Haldwani, Nainital, India. A total of 183 patients were eligible for inclusion during July 1 2013 - June 30 2014. Of these, 59 patients used smoked tobacco exclusively, 22 patients used smokeless tobacco exclusively, and 102 patients used both forms of tobacco. Among users of smoked forms, 75.2% (n=121) were beedi users, and 24.8% (n=40) were cigarette users. Patients were asked direct questions as to whether they had noticed the presence of PHWs upon tobacco products. The reasons as to why PHWs were not effective in stopping the patients from tobacco use were investigated. Results: Of the 183 patients, 146 reported being aware about the presence of PHWs, and when they were asked reasons as to why they continued tobacco despite being aware of ill-effects, the commonest reason chosen (by 53.4%) was that patients had not regarded themselves as using tobacco heavy enough to cause cancer. Among the 36 patients who reported as being oblivious to the presence of PHWs on tobacco products, 63.9% reported that the products they used never displayed any PHWs, and 36.1% reported never having paid attention to the packaging. The awareness about PHWs was higher among cigarette smokers in comparison to beedi smokers (100% vs 76.1%, p=0.0002). Conclusions: Locally produced and marketed tobacco products such as beedis and oral tobacco often fail to display PHWs. The presence of PHWs without doubt enhances awareness about the carcinogenic risks of tobacco. However, enhanced awareness alone may not be enough, and as elucidated by this study, some persons continue to use tobacco to the point of developing malignancies. The need of the hour is the implementation of legal and economic sanctions discouraging the use of tobacco products.
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Pant, Bishweshwar,Park, Mira,Ojha, Gunendra Prasad,Park, Juhyeong,Kuk, Yun-Su,Lee, Eun-Jung,Kim, Hak-Yong,Park, Soo-Jin Elsevier 2018 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.522 No.-
<P><B>Abstract</B></P> <P>A combination of electrospinning technique and hydrothermal process was carried out to fabricate zinc oxide nano-flakes wrapped carbon nanofibers (ZnO/CNFs) composite as an effective electrode material for supercapacitor. The morphology of the as-synthesized composite clearly revealed that the carbon nanofibers were successfully wrapped with ZnO nano-flakes. The electrochemical performance of the as-synthesized nanocomposite electrode was evaluated by the cyclic voltammetry (CV), galvanostatic charge–discharge (GDC), and electrochemical impedance spectroscopy (EIS), and compared with the pristine ZnO nanofibers. It was found that the composite exhibited a higher specific capacitance (260 F/g) as compared to pristine ZnO NFs (118 F/g) at the scan rate of 5 mV/s. Furthermore, the ZnO/CNFs composite also exhibited good capacity retention (73.33%). The obtained results indicated great potential applications of ZnO/CNFs composite in developing energy storage devices with high energy and power densities. The present work might provide a new route for utilizing ZnO based composites for energy storage applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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