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        • KCI등재
        • KCI등재

          Comparison between lignocaine nebulization and airway nerve block for awake fiberoptic bronchoscopy-guided nasotracheal intubation: a single-blind randomized prospective study

          Pooja,Rawat,Mathur,Neena,Jain,Aji,Kumar,Beena,Thada,Veena,Mathur,Deepak,Garg 대한마취통증의학회 2018 Korean Journal of Anesthesiology Vol.71 No.2

          Background: The preferred management strategy for difficult airways is awake fiberoptic bronchoscopy-guided intubation, which requires effective airway anesthesia to ensure patient comfort and acceptance. This randomized single-blind prospective study was conducted to compare lignocaine nebulization and airway nerve block for airway anesthesia prior to awake fiberoptic bronchoscopy-guided intubation. Methods: Sixty adult patients scheduled for surgical procedures under general anesthesia were randomly allocated to two groups. Group N received jet nebulization (10 ml of 4% lignocaine) and Group B received bilateral superior laryngeal and transtracheal recurrent laryngeal nerve blocks (each with 2 ml of 2% lignocaine) followed by fiberoptic bronchoscopy- guided nasotracheal intubation. All patients received procedural sedation with dexmedetomidine. The intubation time, intubating conditions, vocal cord position, cough severity, and degree of patient satisfaction were recorded. Student's t test was used to analyze parametric data, while the Mann-Whitney U test was applied to non-parametric data and Fisher's test to categorical data. P values < 0.05 were considered statistically significant. Results: The time taken for intubation was significantly shorter in Group B [115.2 (14.7) s compared with Group N [214.0 (22.2) s] (P = 0.029). The intubating conditions and degree of patient comfort were better in Group B compared with Group N. Although all patients were successfully intubated, patient satisfaction was higher in Group B. Conclusions: Airway nerve blocks are preferable to lignocaine nebulization as they provide superior-quality airway anesthesia. However, nebulization may be a suitable alternative when a nerve block is not feasible.

        • KCI등재SCOPUS

          Enhanced method for microbial community DNA extraction and purification from agricultural yellow loess soil

          Mathur,Nadarajan,Kathiravan,김근호,류재원,김평일,이철원,김시욱 한국미생물학회 2015 The journal of microbiology Vol.53 No.11

          In this study, novel DNA extraction and purification methods were developed to obtain high-quantity and reliable quality DNA from the microbial community of agricultural yellow loess soil samples. The efficiencies of five different soil DNAextraction protocols were evaluated on the basis of DNA yield, quality and DNA shearing. Our suggested extraction method, which used CTAB, EDTA and cell membrane lytic enzymes in the extraction followed by DNA precipitation using isopropanol, yielded a maximum DNA content of 42.28 ± 5.59 μg/g soil. In addition, among the five different purification protocols, the acid-treated polyvinyl polypyrrolidone (PVPP) spin column purification method yielded high-quality DNA and recovered 91% of DNA from the crude DNA. Spectrophotometry revealed that the ultraviolet A260/A230 and A260/A280 absorbance ratios of the purified DNA were 1.82 ± 0.03 and 1.94 ± 0.05, respectively. PCR-based 16S rRNA amplification showed clear bands at ~1.5 kb with acid-treated PVPP–purified DNA templates. In conclusion, our suggested extraction and purification protocols can be used to recover high concentration, high purity, and high-molecular-weight DNA from clay and silica-rich agricultural soil samples.

        • KCI등재

          Impact of Egg Laying Duration on the Occurrence of Fertilized and Unfertilized Eggs of the Newly Evolved Race of Bombyx mori, L.

          Mathur,,Vinod,B.,Sarkar,,Kunal Korean Society of Sericultural Science 2008 International Journal of Industrial Entomology Vol.16 No.1

          The present study was carried out with the aim to evaluate the viability of layings (delivery of fertilized and unfertilized eggs) with egg laying duration of elite bivoltine races. The temporal aspect of mating in terms of egg layings duration may also have impact on the number of eggs laid, pattern of egg laying and their viability. After different interval of egg laying duration, moth of Bombyx mori are removed from oviposition site after they have completed egg laying. Present investigation confirmed that there are no significant difference in relation to the occurrence of viable (fertilized) and non viable (unfertilized) eggs and duration of oviposition. Percentage of unfertilized eggs varied from 2.41 to 3.42% in case of CSR-3, 2.59 to 3.62% in case of CSR-6, 2.82 to 3.66% in case of CSR-16 and 2.58 to 3.40% in case of CSR-17 in different treatments. The occurrence of unfertilized eggs are also not significant in the different treatments specially in those eggs which were laid 24 hours after oviposition and kept for 4 months hibernation schedule.

        • KCI등재SCOPUS

          Evaluation of Steady State and Unsteady State Mass Transfer Rate of Cr(VI) in Immobilized Bacillus sp.

          Mathur,Nadarajan,Kathiravan,김근호,류재원,한기환,김시욱 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.2

          A novel hexavalent chromium (CrVI)-removing Bacillus sp. was isolated from leather industry wastewatercontaminated soil. This potential isolate was subjected to Cr(VI) removal under free and immobilized states in a stirred batch reactor (SBR). Two biokinetic parameters, Vmax and Km, and the effective diffusivity (De) for various bead sizes were calculated from Lineweaver-Burk and Eadie-Hoftsee plots, respectively. With respect to bead size, De decreased significantly from a maximum of 3.024 × 10−6 cm2/sec in the 0.20 cm bead to 2.948 × 10−6, 1.775 × 10−7, and 1.144 × 10−7 cm2/sec in the 0.40-, 0.60- and 0.80 cm beads, respectively. Additionally, steady and unsteady state modeling of diffusional mass transfer into the immobilized beads was conducted to determine the mass transfer rate as a function of time and the beads' radial profile. Furthermore, the space-time yield (STY) was modeled according to the residence time of the reactor. The reactor's STY was reasonable and could be further boosted by increasing the fractional biocatalyst.

        • SCIESCOPUSKCI등재
        • SCIESCOPUSKCI등재

          A Novel Route to Realise High Degree of Graphitization in Carbon-carbon Composites Derived from Hard Carbons

          Mathur,,R.B.,Bahl,,O.P.,Dhami,,T.L.,Chauhan,,S.K. Korean Carbon Society 2003 Carbon Letters Vol.4 No.3

          Carbon/carbon composites were developed using PAN based carbon fibres and phenolic resin as matrix in different volume fractions and heat treated to temperatures between $1000^{\circ}C$ to $2500^{\circ}C$. Although both the starting precursors are nongraphitizing hard carbons individually, their composites lead to very interesting properties e.g. x-ray diffractograms show the development of graphitic phase for composites having fibre volume fractions of 30~40%. Consequently the electrical resistivity of such composites reaches a value of $0.8\;m{\Omega}cm$, very close to highly graphitic material. However, it was found that by increasing the fibre volume fraction to 50~60%, the trend is reversed. Optical microscopy of the composites also reveals the development of strong columnar type microstructure at the fibre (matrix interface due to stress graphitization of the matrix. The study forcasts a unique possibility of producing high thermal conductivity carbon/carbon composites starting with carbon fibres in the chopped form only.

        • KCI등재

          Impact of Mating Duration on the Fecundity of the Newly Evolved Races

          Mathur,Vinod,B.,Sarkar,Kunal Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.2

          Of all factors that govern productivity in sericulture, the role of silkworm egg is of prime importance. The production of silkworm seed involves a long chain of interdependent and highly specialized conditions. Female moths of Bombyx mori L. commence egg deposition immediately when the moths were decoupled. More than 60% of eggs are deposited within 4 hrs after decoupling i.e. 62.33% in CSR-3, 61.67% in CSR-6, 62.50% in CSR-16 and 63.28% in CSR-17. Almost 90% of eggs were laid in the first 12 hrs (93.13% in CSR-3, 90.81% in CSR-6, 89.71% in CSR-16 and 93.17% eggs in CSR-17) after decoupling. Almost 8 to 10% of more eggs were laid when oviposition period was prolonged upto 48 hrs instead of 24 hrs. The present investigation showed that a significant increase of 45 (8.34%), 50 (9.98%), 41 (8.26%) and 45 (8.30%) (P < 0.01) numbers of more eggs were found between 24 to 48 hrs (T6 to T9) in CSR-3, CSR-6, CSR-16 and CSR-17 races respectively. The findings of present investigation is very important for sericulture industry while producing layings to keep for different hibernation schedule especially for autumn/late autumn crop, female may be allowed for prolonged oviposition to get 8 -10% more eggs and farmer may fetch 8 -10 kg. more cocoon yield/l00 dfls with more income.

        • SCIESCOPUSKCI등재

          Controlling the Hardness and Tribological Behaviour of Non-asbestos Brake Lining Materials for Automobiles

          Mathur,,R.B.,Thiyagarajan,,P.,Dhami,,T.L. Korean Carbon Society 2004 Carbon Letters Vol.5 No.1

          In spite of unparalleled combination of essential material properties for brake linings and clutch facings, replacement for asbestos is seriously called for since it is a health hazard. Once asbestos is replaced with other material then composition and properties of brake pad changes. In certain cases hardness of the material may be high enough to affect the rotor material. In this study, hardness of the brake pad has been controlled using suitable reinforcement materials like glass, carbon and Kevlar pulp. Brake pad formulations were made using CNSL (cashew net shell liquid) modified phenolic resin as a binder, graphite or cashew dust as a friction modifier and barium sulphate, talc and wollastonite as fillers. Influence of each component on the hardness value has been studied and a proper formulation has been arrived at to obtain hardness values around 35 on Scleroscopic scale. Friction and wear properties of the respective brake pad materials have been measured on a dynamometer and their performance was evaluated.

        • SCIESCOPUSKCI등재

          Interface and Microstructure Development in Carbon/Carbon Composites

          Mathur,,R.B.,Bahl,,O.P.,Dhami,,T.L.,Chauhan,,S.K.,Dhakate,,S.R.,Rand,,B. Korean Carbon Society 2004 Carbon Letters Vol.5 No.2

          Performance of carbon-carbon composites is known to be influenced by the fibre matrix interactions. The present investigation was undertaken to ascertain the development of microstructure in such composites when carbon fibres possessing different surface energies (T-300, HM-35, P120 and Dialed 1370) and pitch matrices with different characteristics (Coal tar pitch $SP110^{\circ}C$ and mesophase pitch $SP285^{\circ}C$) are used as precursor materials. These composites were subjected to two different heat treatment temperatures of $1000^{\circ}C$ and $2600^{\circ}C$. Quite interesting changes in the crystalline parameters as well as the matrix microstructure are observed and attempt has been made to correlate these observations with the fibre matrix interactions.

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