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- 저자 : Tiwari, Charu (검색결과 471 건)
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Tiwari, Alka,Shukla, Alok,Tiwari, Diwakar,Choi, Suk Soon,Shin, Hyun-Gon,Lee, Seung-Mok The Korean Society of Industrial and Engineering C 2019 공업화학 Vol.30 No.3
The aim of this review article is to summarize the role of titanium oxide ($TiO_2$) nanomaterials in the remediation of the aquatic environment contaminated with various emerging pollutants. The advanced oxidation process led by the semiconductor $TiO_2$ is an impetus in the remediation technology. Therefore, a vast number of literature works are available in this area. Further, the role of modified $TiO_2$ or thin film materials were discussed in the review. Also, the Localized Surface Plasmon Resonance (LSPR) effect of using noble metaldoped $TiO_2$ played an interesting role in the remediation process.
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Tiwari, Jitendra N.,Kemp, Kingsley Christian,Nath, Krishna,Tiwari, Rajanish N.,Nam, Hong-Gil,Kim, Kwang S. American Chemical Society 2013 ACS NANO Vol.7 No.10
<P>Controlling the morphology and size of platinum nanodendrites (PtDs) is a key factor in improving their catalytic activity and stability. Here, we report the synthesis of PtDs on genomic-double-stranded-DNA/reduced-graphene-oxide (gdsDNA/rGO) by the NaBH<SUB>4</SUB> reduction of H<SUB>2</SUB>PtCl<SUB>6</SUB> in the presence of plant gdsDNA. Compared to industrially adopted catalysts (<I>i.e.</I>, state-of-the-art Pt/C catalyst, Pt/rGO, Pt<SUB>3</SUB>Co, <I>etc.</I>), the as-synthesized PtDs/gdsDNA/rGO hybrid displays very high oxygen reduction reaction (ORR) catalytic activities (much higher than the 2015 U.S. Department of Energy (DOE) target values), which are the rate-determining steps in electrochemical energy devices, in terms of onset-potential, half-wave potential, specific-activity, mass-activity, stability, and durability. Moreover, the hybrid exhibits a highly stable mass activity for the ORR over a wide pH range of 1–13. These exceptional properties would make the hybrid applicable in next-generation electrochemical energy devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-10/nn4038404/production/images/medium/nn-2013-038404_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn4038404'>ACS Electronic Supporting Info</A></P>
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( Alka Tiwari ),( Alok Shukla ),( Diwakar Tiwari ),( Suk Soon Choi ),( Hyun-gon Shin ),( Seung-mok Lee ) 한국공업화학회 2019 공업화학 Vol.30 No.3
The aim of this review article is to summarize the role of titanium oxide (TiO<sub>2</sub>) nanomaterials in the remediation of the aquatic environment contaminated with various emerging pollutants. The advanced oxidation process led by the semiconductor TiO<sub>2</sub> is an impetus in the remediation technology. Therefore, a vast number of literature works are available in this area. Further, the role of modified TiO<sub>2</sub> or thin film materials were discussed in the review. Also, the Localized Surface Plasmon Resonance (LSPR) effect of using noble metaldoped TiO<sub>2</sub> played an interesting role in the remediation process.
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Alka Tiwari,Alok Shukla,Lalliansanga,Diwakar Tiwari,이승목 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
Novel meso-porous nanoparticles Au/TiO2 thin films were obtained by template synthesis using polyethylene glycol as filler medium. The materials were characterized by advanced analytical methods. The photocatalysts were employed for the photocatalytic degradation of tetracycline from aqueous solutions using UV-A light (λmax 330 nm). Various physico-chemical parametric studies enabled to deduce the mechanism of degradation. A significant percentage of tetracycline was mineralized by the treatment. The stability of thin film was evidenced with the repeated use of thin film. The degradation of tetracycline was proceeded predominantly by the OH radicals generated at the valance and conduction band of semiconductor.
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Tiwari, Arjun Prasad,Joshi, Mahesh Kumar,Lee, Joshua,Maharjan, Bikendra,Ko, Sung Won,Park, Chan Hee,Kim, Cheol Sang Elsevier 2017 Colloids and surfaces. A, Physicochemical and engi Vol.520 No.-
<P><B>Abstract</B></P> <P>Polycaprolactone (PCL) based electrospun membranes possess many favorable characteristics such as flexibility, high mechanical properties, and non-toxicity, all of which are required for tissue engineering applications. However, their hydrophobic nature and low biocompatibility limit their uses. To overcome these drawbacks, we propose highly biocompatible and hydrophilic heterogeneous scaffolds from a blend of PCL with polyethylene glycol (PEG) that is composed of nano-nets along with backbone/main fibers via an electro-spinning/netting (ESN) technique. Different scaffolds were fabricated by varying the mass composition of PCL to PEG and evaluated physicochemically and biologically. Scanning electron microscopy showed that the PCL/PEG membranes were of a bimodal structure consisting of backbone/main fibers (diameter range=350–600nm) and ultrathin nano-nets while the pure PCL mat was composed of only backbone fibers (diameter range=550–800nm). The nano-nets were composed of ultrathin nano-wires with an average diameter of 10–20nm, shaped in a hexagonal form. We have also prepared the PCL/PEG membranes without nano-nets and compared them to heterogeneous membranes in order to describe the effect of the nano-nets by well distinguishing the effect of PEG on tissue engineering applications such as wettability, biocompatibility, and biomineralization. The results showed that heterogeneous scaffolds exhibit enhanced wettability, mechanical stability, biocompatibility, and mineralization compared to pure PCL and PCL/PEG scaffolds without nano-nets, which confirmed that the nano-nets in the membranes had positive effects for tissue engineering applications. Findings from this study have revealed that the heterogeneous fibrous membrane could be useful in the design and tailoring of a suitable structure as a scaffold for bone tissue engineering.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Heterogeneous fibrous membrane was reported from PCL/PEG first time via electro-spinning/netting (ESN). </LI> <LI> Heterogeneous membrane was consisting of thicker/backbone fibers and ultrathin nano-nets. </LI> <LI> Hydrophilicity and mineralization were improved with incorporation of PEG into PCL fibers. </LI> <LI> Heterogeneous scaffolds showed better support for cell activities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Fasting Heat Production of Growing Buffalo Calves
Tiwari, C.M.,Chandramoni, Chandramoni,Jadhao, S.B.,Khan, M.Y. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.3
Fasting heat production (FHP) of growing buffalo calves (Bubalus bubalis) in the body weight range of 76 to 236 kg was determined using open circuit respiration chamber. The details of the chambers, calibration of gas analysers and operation of the systems are described. Animals were fasted for 96 hrs during which only water was provided. FHP was determined during next 24 hrs. The mean oxygen consumed, carbon dioxide and methane produced and urinary N excretion per 24 h was $17.03{\ell}$, $11.70{\ell}$, and $0.12{\ell}$ and 0.35 g respectively. The mean respiratory quotient ranged from 0.68 to 0.71, which indicated that post absorptive stage is reached after 96 hrs in growing buffalo calves previously fed ammoniated straw-based ration. Mean FHP of calves was $331.4kJ/kg\;W^{0.75}$. FHP of calves with range of mean body weights of 167 to 235 kg, although nonsignificant but, was almost 12% higher than of calves having mean body weight of 101 kg. Suitable exponent to body weight to describe FHP of buffalo calves was 0.87.
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Tiwari Jagesh Kumar,Mandadi Nagesh,Sridhar Jandrajupalli,Mandal Vikramjit,Ghosh Arpita,Kardile Hemant B.,Naga Kailash C.,Shah Mohd Abas,Rawat Shashi,Venkateswarlu Vallepu,Malik Kamlesh,Bhatnagar Anuj 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.2
The foxglove aphid (or glasshouse potato aphid, Aulacorthum solani Kaltenbach) transmits serious potato viruses (potato virus Y, and potato leaf roll virus) which cause heavy yield losses. Our aim of this study was to pre liminary analysis of draft genome sequence to uncover virulence genes in the aphid. The genome assembly size (316.39 Mb) was very close to its genome size (318.19 Mb) estimated by flow cytometry. The genome completeness (81.8%) was confirmed by the Benchmarking Universal Single Copy Orthologs (BUSCO) analysis indicating 14.90% transposable elements (TEs) in the genome. Of total 22,021 predicted genes, 16,610 were annotated with putative functions of other aphids mainly Myzus persicae, Acyrthosiphon pisum and Diuraphis noxia. We identified virulence genes such as defensive and detoxification genes, salivary genes and chemore ceptors, insecticide resistance genes, virus transmission genes, transcription factors and mitochondrial genes. Importantly, analysis of detoxification genes particularly 53 cytochrome P450s (CYPs) indicated involvement of 23 CYPs families in aphid genome. Further, GO and KEGG pathways analyses showed gene enrichment pre dominantly with molecular function and signal transduction, respectively. Phylogeny analysis revealed genetic divergence among 12 aphid species and Au. solani is closely related with M. persicae. Further, non-synonymous (Ka)/synonymous (Ks) substitutions (Ka/Ks) indicated positive selection for 6 (Ka/Ks > 1) and 122 (Ka/Ks = 0.5–1) single copy orthologous gene pairs between Au. solani and with the pea aphid. Thus, our preliminary draft genome analysis provides new insights of Au. solani to understand molecular basis of aphid biology, host-aphid interactions and adaptation mechanism.
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Tiwari, Ram Vinod,Gupta, Anjali,Agrawal, Ankush,Gandhi, Aniruddh,Gupta, Manjari,Das, Mayank Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15
Background: Tobacco consumption has become pandemic, and is estimated to have killed 100 million people in the 20th century worldwide. Some 700,000 out of 5.4 million deaths due to tobacco use were from India. The era of global modernization has led to an increase in the involvement of women in tobacco consumption in the low income and middle-income countries. Tobacco consumption by females is known to have grave consequences. Objectives: To assess: (1) the tobacco use among urban and rural women; (2) the discrepancy in the knowledge, belief and behavior towards tobacco consumption among urban and rural women in Durg-Bhilai Metropolitan, Chhattisgarh, Central India. Materials and Methods: The study population consisted of 2,000 18-25 year old young women from Durg-Bhilai Metropolitan, Chhattisgarh, Central India, from both urban and rural areas. Data were collected using a pretested, anonymous, extensive face to face interview by a female investigator to assess the tobacco use among women and the discrepancy in the knowledge, belief and behavior towards tobacco consumption among urban and rural individuals. Results: The prevalence of tobacco use was found to be 47.2%. Tobacco consumption among rural women was 54.4% and in urban women was 40%. The majority of the women from urban areas (62.8%) were smokers whilst rural women (77.4%) showed preponderance toward smokeless tobacco use. Urban women had a better knowledge and attitude towards harms from tobacco and its use than the rural women. Women in rural areas had higher odds (1.335) of developing tobacco habit than the urban women. Conclusions: Increased tobacco use by women poses very severe hazards to their health, maternal and child health, and their family health and economic well-being. Due to the remarkably complex Indian picture of female tobacco use, an immediate and compulsory implementation of tobacco control policies laid down by t he WHO FCTC is the need of the hour.
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Tiwari, Arjun Prasad,Hwang, Tae In,Oh, Jung-Mi,Maharjan, Bikendra,Chun, Sungkun,Kim, Beom Su,Joshi, Mahesh Kumar,Park, Chan Hee,Kim, Cheol Sang American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.24
<P>Localized drug-delivery systems (LDDSs) are a promising approach for cancer treatment because they decrease systematic toxicity and enhance the therapeutic effect of the drugs via site-specific delivery of active compounds and possible gradual release. However, the development of LDDS with rationally controlled drug release and intelligent functionality holds great challenge. To this end, we have developed a tailorable fibrous site-specific drug-delivery platform functionalized with pH- and near-infrared (NIR)-responsive polypyrrole (PPy), with the aim of cancer treatment via a combination of photothermal ablation and chemotherapy. First, a paclitaxel (PTX)-loaded polycaprolactone (PCL) (PCL-PTX) mat was prepared by electrospinning and subsequently in situ membrane surface-functionalized with different concentrations of PPy. The obtained PPy-functionalized mats exhibited excellent photostability and heating property in response to NIR exposure. PPy-coated mats exhibited enhanced PTX release in a pH 5.5 environment compared to pH 7.4. Release was further accelerated in response to NIR under both conditions; however, superior release was observed at pH 5.5 compared to pH 7.4, indicating a dual stimuli-responsive (pH and NIR) drug-delivery platform. More importantly, the 808 nm NIR irradiation enabled markedly accelerated PTX release from PPy-coated PCL-PTX mats and slowed and sustained release following termination of laser irradiation, confirming representative stepwise drug-release properties. PPy-coated PCL-PTX mats presented significantly enhanced in vitro and in vivo anticancer efficacy under NIR irradiation compared to PPy-coated PCL-PTX mats not exposed to NIR or uncoated mats (PCL-PTX). This study has thus developed a promising fibrous site-specific drug-delivery platform with NIR- and pH-triggering that notably utilizes PPy as a dopant for synergistic photothermal chemotherapy.</P> [FIG OMISSION]</BR>
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