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Renuka Garg,Renu Gupta,Ajay Bansal 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.3
Removal of Bisphenol A (BPA) from surface waters is necessary before consumption. A study, therefore, was conducted to degrade BPA using graphene oxide, ZnO and ZnO decorated on graphene oxide. Hydrothermal method was used to synthesize the hybrid nano-catalysts. 99.5% photocatalytic degradation of BPA was achieved by using ZG0.6 nano-catalyst in comparison to bare ZnO and GO nano-catalysts at natural pH of 7.5 in 60 min of UV irradiation. The higher photocatalytic activity of ZG0.6 nano-catalyst could be ascribed to an improved surface area, efficient charge separation as well as the decreased recombination rate of electron-hole charge carriers, leading to the generation of highly reactive hydroxyl radicals for the degradation of BPA. Photocatalytic degradation followed LangmuirHinshelwood model with pseudo-first-order kinetics. The degradation mechanism is also detailed with identification of reaction intermediates. Degradation pathways, based on LCMS analysis, have been proposed. The pathways revealed the formation of smaller by-products such as phenol, hydroquinol and (Z)-3-hydroxyacrylaldehyde. The developed ZG0.6 nano-catalyst were found to be reusable for consecutive five runs without much loss in the activity and have the advantage of effective charge separation.
Reducing Test Utilization in Hospital Settings: A Narrative Review
Renuka S. Bindraban,Maarten J. ten Berg,Christiana A. Naaktgeboren,Mark H.H. Kramer,Wouter W. van Solinge,Prabath W. B. Nanayakkara 대한진단검사의학회 2018 Annals of Laboratory Medicine Vol.38 No.5
Background: Studies addressing the appropriateness of laboratory testing have revealed approximately 20% overutilization. We conducted a narrative review to (1) describe current interventions aimed at reducing unnecessary laboratory testing, specifically in hospital settings, and (2) provide estimates of their efficacy in reducing test order volume and improving patient-related clinical outcomes. Methods: The PubMed, Embase, Scopus, Web of Science, and Canadian Agency for Drugs and Technologies in Health-Health Technology Assessment databases were searched for studies describing the effects of interventions aimed at reducing unnecessary laboratory tests. Data on test order volume and clinical outcomes were extracted by one reviewer, while uncertainties were discussed with two other reviewers. Because of the heterogeneity of interventions and outcomes, no meta-analysis was performed. Results: Eighty-four studies were included. Interventions were categorized into educational, (computerized) provider order entry [(C)POE], audit and feedback, or other interventions. Nearly all studies reported a reduction in test order volume. Only 15 assessed sustainability up to two years. Patient-related clinical outcomes were reported in 45 studies, two of which found negative effects. Conclusions: Interventions from all categories have the potential to reduce unnecessary laboratory testing, although long-term sustainability is questionable. Owing to the heterogeneity of the interventions studied, it is difficult to conclude which approach was most successful, and for which tests. Most studies had methodological limitations, such as the absence of a control arm. Therefore, well-designed, controlled trials using clearly described interventions and relevant clinical outcomes are needed.
Renuka, G.,Shamitha, G. Korean Society of Sericultural Science 2013 International Journal of Industrial Entomology Vol.26 No.1
The commercial rearing of polyphagous Indian tasar silkworm, Antheraea mylitta Drury being practiced on naturally grown primary food plants like Terminalia arjuna, (Arjun) Terminalia tomentosa (Asan), and Shorea robusta (Sal) available in the tropical forests of central India, at times, is seriously affected by the disease- Pebrine, caused by Nosema sp., a microsporidian pathogen. The present investigation on comparative larval, silk gland weight and also cocoon parameters in Pebrine-free and Pebrine-infected ecorace of tasar silkworm Antheraea mylitta Drury (Daba TV), illustrates the tasar silkworm larvae infected with pebrine disease causing heavy losses to the economy of the silk industry.
Nutritional evaluation of processing discards from tiger tooth croaker, Otolithes ruber
Renuka, Vijayakumar,Zynudheen, Abubacker Aliyamveetil,Panda, Satyen Kumar,Ravishankar, Chandragiri Nagaraja Rao 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.5
Processing discards from tiger tooth croaker, such as head, viscera, and swim bladder, were analyzed for proximate, biochemical, fatty acid, and mineral composition. The proximate analysis showed high protein content (21.04%) in the swim bladder and high fat content (4.10%) and ash content (2.26%) in the head. The biochemical quality indices such as non-protein nitrogen, total volatile base, trimethylamine, free fatty acids, peroxide value, and thiobarbituric acid reactive substances in the viscera were higher than those in the head and swim bladder. Gas chromatographymass spectrometry analysis of fatty acids composition showed high polyunsaturated fatty acids in the head (58.82%), followed by the viscera (45.80%) and the swim bladder (35.57%). The major available saturated fatty acid, i.e., palmitic acid, was higher in the swim bladder (30.49%). Mineral and heavy metals analyzed via inductively coupled plasma-optical emission spectrometer showed high calcium, sodium, and magnesium contents in the head region (346.80, 62.55, and 14.89 mg/kg respectively). Heavy metal levels were within the permissible limit.
Renuka Verma,Pradip K. Maji,Sudipta Sarkar 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.111 No.-
Prolonged exposure to trace Cr(VI) concentrations in potable water can cause serious health problems inliving beings. A weak base anion exchange resin, Duolite A7, showed a large capacity for trace Cr(VI)removal from a background of competing anions present at much higher concentrations, while conventionalion exchangers and adsorbents become ineffective due to lack of selectivity under similar conditions. The objective of this study was to find out the mechanism behind such significant capacityshown by the resin. Fixed-bed column studies showed that the resin was fully exhausted below 4,000bed volumes (BVs) for pH 7, whereas no breakthrough was observed for 25,000 and 131,000 BVs at pH5 and 3, respectively. Extensive characterization studies revealed that redox reactions were also occurringinside the resin in addition to ion exchange, where Cr(VI) oxidized the amine functional groupsand phenol–formaldehyde matrix while itself getting reduced to Cr(III). Cr(III) formed was either precipitatedinside the resin as Cr(OH)3 or bound with the oxidation products such as carboxylic acid groups. Analysis of treated water showed that formaldehyde, a carcinogen, was formed due to oxidative attackof Cr(VI) on the resin and was released in the effluent at trace concentrations. A detailed understandingof the mechanism would motivate the development of such redox-active sorbents for selective trace Cr(VI) removal from contaminated drinking water.
Bioactivities of Polyphenolics from the Roots of Bauhinia racemosa
Renuka Jain,Umesh Saxena,Kiran Rathore,Satish C. Jain 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.12
Various extracts of Bauhinia racemosa Lamk. (roots) and the isolated polyphenolics, viz. 1,7,8,12b-tetrahydro-2,2,4-trimethyl-10-methoxy-2H-benzo [6,7] cyclohepta[1,2,3-de][1]benzopyran-5,9-diol (racemosol) (1), 1,7,8,12b-tetrahydro-2,2,4-trimethyl-2H-benzo[6,7]cyclohepta[1,2,3-de][1]benzopyran-5,10,11-triol (2), and 1,7,8,12b-tetrahydro-2,2,4-trimethyl-2H-benzo[6,7] cyclohepta [1,2,3-de][1]benzopyran-5,9,10-triol (de-O-methyl racemosol) (3) were screened for antibacterial, antifungal, and antiviral activities. The isolated compounds exhibited profound antibacterial and antifungal activities while methanol extract exhibited potential efficacy against Herpes simplex virus.