A new tyrosinase biosensor based on covalent immobilizationof enzyme on N-(3-aminopropyl) pyrrole polymer film

Rajesh,K.Kaneto 한국물리학회 2005 Current Applied Physics Vol.5 No.2

A conducting polymer film of N-amino substituted pyrrole monomer has been prepared for covalent immobilization of enzyme for biosensing applications, illustrated by tyrosinase (PPO).The tyrosinase enzyme retains its bioactivity when being immobilized on N-substituted pyrrole polymer film by covalent bonding.The enzyme electrode was characterized by UV.Vis and infrared spectroscopy.Phenolic compounds were quantitatively estimated by the direct electrochemical reduction of enzymatically liberated quinone species at 0.2 V vs. Ag/AgCl. The results of amperometric response measurements conducted on enzyme electrode show sensitivity of 57.6, 71.4 and 45.8 mAM1cm2 and a linear response range of 1.8.170.2, 1.3.110.1 and 2.1.168 lM for phenol, catechol and p-cresol, respectively. The biosensor exhibits a lowest detection limit of 0.9, 0.7 and 1.1 lM, for phenol, catechol and p-cresol, respectively and a period of stable sensitivity of 3 months at 4.5 C.

Simultaneous co-immobilization of enzyme and a redox mediatorin polypyrrole film for the fabrication of an amperometricphenol biosensor

Rajesh,S.S. Pandey,W. Takashima,K. Kaneto 한국물리학회 2005 Current Applied Physics Vol.5 No.2

A conducting polypyrrole lm has been prepared on indium tin oxide coated glass plate by electropolymerization of pyrrole in anaqueous solution of enzyme, tyrosinase (PPO), and a redox mediator potassium hexacyanoferrate (II). The enzyme retains its bio-activity well within the polymer lm. Phenol concentration in aqueous solution was quantitatively estimated by monitoring the elec-tron exchange occurring in redox mediator within the polymer matrix i.e. direct reduction of Fe (III) to Fe (II) ion at +0.12V vs. Ag/AgCl. The results of amperometric response measurements conducted on enzyme electrode (PPO/Fe2+/PPY/ITO) show a sensitivityof 0.33 AM. 1 cm. 2 and a linear response range of 4.5107.4l M for phenol in aqueous medium. The electrode exhibits a responsetime of about 80 second and is stable for 4 months at 4.C..

Effect of Preoperative Vitamin D Levels on Functional Performance after Total Knee Arthroplasty

Rajesh Navin Maniar,Aniket Machindra Patil,Adit Rajesh Maniar,Bharat Gangaraju,Jaivardhan Singh 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.2

Background: Low vitamin D levels affects muscle function. Vitamin D and calcium deficiency cause osteomalacic myopathy and poor functional recovery after hip fractures. The relationship of vitamin D and functional performance after total knee arthroplasty (TKA) is not previously reported. Methods: Influence of vitamin D on functional performance before and after TKA was reviewed retrospectively in 120 patients. Of these, 64 had vitamin D deficiency (25-hydroxy vitamin D < 30 ng/mL) preoperatively. All 120 patients received vitamin D oral supplementation postoperatively. Functional parameters including Western Ontario and McMaster Osteoarthritis Index (WOMAC), Short-Form Health Survey questionnaire, and Knee Society Score were assessed pre- and postoperatively at 3 months. Results: Preoperative function was significantly lower in osteoarthritic patients with vitamin D deficiency (WOMAC score; p = 0.040), but at 3 months all functional scores were similar. Conclusions: We concluded that vitamin D deficiency has a negative effect on function in knee osteoarthritic patients. However, postoperative vitamin D supplementation can lead to functional recovery in these patients. Thus, TKA should not be delayed in vitamin D deficient patients; rather supplementation in the postoperative period is preferable to achieve comparable functional outcome at 3 months to patients with vitamin D sufficiency.

A novel hybrid technique to treat flush mesenteric arterial occlusion in acute-on-chronic mesenteric ischemia

Rajesh Girdhardas Mundhada,Atul Dharmaraj Rewatkar,Aishwarya Atul Rewatkar,Anju Rajesh Mundhada,Nikita Navin Chandak 소화기인터벤션의학회 2023 International journal of gastrointestinal interven Vol.12 No.1

Acute mesenteric occlusion is a life-threatening condition with a significant mortality rate and requires prompt diagnosis and revascularization using open repair, a hybrid procedure, or endovascular intervention. The open approach is associated with significant morbidity and mortality, while endovascular procedures are done by the antegrade or retrograde open mesenteric stent technique and have been observed to improve the prognosis and outcomes of mesenteric ischemia. We report three cases of acute-on-chronic mesenteric ischemia secondary to occlusion with failed percutaneous mesenteric artery stenting. They were successfully treated using a novel hybrid technique, without the need for mesenteric arteriotomy or subsequent arterial repair.

Ratio-Cum-Product Estimators of Population Mean Using Known Population Parameters of Auxiliary Variates

Tailor, Rajesh,Parmar, Rajesh,Kim, Jong-Min,Tailor, Ritesh The Korean Statistical Society 2011 Communications for statistical applications and me Vol.18 No.2

This paper suggests two ratio-cum-product estimators of finite population mean using known coefficient of variation and co-efficient of kurtosis of auxiliary characters. The bias and mean squared error of the proposed estimators with large sample approximation are derived. It has been shown that the estimators suggested by Upadhyaya and Singh (1999) are particular case of the suggested estimators. Almost ratio-cum product estimators of suggested estimators have also been obtained using Jackknife technique given by Quenouille (1956). An empirical study is also carried out to demonstrate the performance of the suggested estimators.

Facile hydrothermal synthesis and electrochemical supercapacitor performance of hierarchical coral-like ZnCo₂O₄ nanowires

Rajesh, John Anthuvan,Min, Bong-Ki,Kim, Jae-Hong,Kang, Soon-Hyung,Kim, Hyunsoo,Ahn, Kwang-Soon Elsevier 2017 Journal of Electroanalytical Chemistry Vol.785 No.-

<P><B>Abstract</B></P> <P>This paper reports a facile hydrothermal synthesis of hierarchical coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanostructures comprised of necklace type nanowires without the use surfactants. The hierarchical coral structure is composed of an interconnected necklace-type nanowire arrangement on the nanoscale, facilitating charge transportation. In addition, the coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires were mesoporous (29.36m<SUP>2</SUP> g<SUP>−1</SUP> and 18.96nm), leading to large electrochemical active sites for the redox reaction and fast ion transport within the ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires. When used in electrochemical supercapacitors, the interconnected necklace type, coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires exhibited a significantly high specific capacity (694Fg<SUP>−1</SUP> at a current density of 2Ag<SUP>−1</SUP>), high rate capability (264Fg<SUP>−1</SUP> at 10Ag<SUP>−1</SUP>), and excellent cycling stability (capacitance retention of ∼85% even after 2000cycles at a charge-discharge current density of 10Ag<SUP>−1</SUP>). These results suggest that hierarchical coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires are a promising electrode material for energy storage applications in high-performance pseudocapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires were synthesized by facile hydrothermal method. </LI> <LI> The ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires exhibited a large electrochemically active surface area of 29.36m<SUP>2</SUP> g<SUP>−1</SUP>. </LI> <LI> Coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires delivered a specific capacitance of 694Fg<SUP>−1</SUP> at a current density of 2Ag<SUP>−1</SUP>. </LI> <LI> Coral-like ZnCo<SUB>2</SUB>O<SUB>4</SUB> nanowires showed ∼85% capacitance retention after 2000cycles at a current density of 10Ag<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Necessity and Feasibility of DNS studies for complex turbomachinery flows

Rajesh Ranjan 한국전산유체공학회 2022 한국전산유체공학회 학술대회논문집 Vol.2022 No.10

Rare Earths Recovery from Waste Permanent Magnets (WPMs) by Hydrometallurgical Methods

( Rajesh Kumar Jyothi ),( Jin-young Lee ),( Kyeong Woo Chung ),( Jong Hyuk Jeon ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-

Rare earths are a series of 17 elements (the lanthanides, yttrium, and scandium) which are key components in the current lifestyle. Those metals have multiple applications in different areas especially in the electrical and electronics fields alongside being key materials for green energy production. To recover rare earths from primary (ores) and secondary sources (scraps, spent magnets, etc.) the economically sound and most convenient technology involves liquid- liquid extraction. Several countries, such as South Korea, lack of primary sources of these important metals, therefore they must recur to recycling -or importation (fluctuating depending on the market supply and demand)- to fulfill the demand necessary for their growing high-tech industries, dedicated primarily to the manufacture of electrical and electronic items used in the daily life. In addition, after electronic and industrial goods are used they must be discarded usually in landfills, which in small countries with high population density is a great economic, social and environmental burden. The countries with the highest population densities according to the economic co-operation and development (OECD) organization records (year 2012) are South Korea, The Netherlands, Belgium, Israel, Japan, UK, Germany, Luxemburg, Italy and Switzerland (http://www.un.org/en/development/desa/population/publications/trends/wpp2012. The market trade of rare earths is a monopoly controlled by China, followed by a small supply from India, Australia, Malaysia, Brazil, USA and Russia. China’s monopoly of the RE trade can be seen as detrimental for the free economy of these goods having applications widely in the metallurgy, permanent magnets, electronics, fabrication of household items, glass, alloys, petroleum refining catalysts, among others. The major rare earth consuming industrial products are magnets 26%, metal alloys 19%, polishing 16.5%, catalysts 15%, glass/phosphors 6% and ceramics/others 5.5%, which shows the necessity of an industrial and economically feasible process to recover REEs from waste or secondary resources. The Department of Energy in the United States recognize four elements as critical due to their multiple industrial applications: neodymium, praseodymium, dysprosium and terbium. When talking about green economy, the first option that must be considered is the minimization of the consumption of the elements or the minimization of waste production. The second option to be considered is the reuse, recycling and recovery of the waste produced in the fabrication process of consumer products. Finally, the least favored option is the disposal of waste, which must overcome the landfill challenge. By reusing and recycling rare earth elements from secondary sources the national demand of these metals can be reached without consuming primary resources and having and environmental friendly process.

Addition of Endoscopic Ultrasound (EUS)-Guided Fine Needle Aspiration and On-Site Cytology to EUS-Guided Fine Needle Biopsy Increases Procedure Time but Not Diagnostic Accuracy

Rajesh N. Keswani,Kumar Krishnan,Sachin Wani,Laurie Keefer,Srinadh Komanduri 대한소화기내시경학회 2014 Clinical Endoscopy Vol.47 No.3

Background/Aims: Although the diagnostic accuracy of endoscopic ultrasound with fine needle aspiration (EUS-FNA) in pancreas adenocarcinomais high, endoscopic ultrasound with fine needle biopsy (EUS-FNB) is often required in other lesions; in these cases, it may bepossible to forgo initial EUS-FNA and rapid on-site cytology evaluation (ROSE). The aim of this study was to compare the diagnostic accuracyof EUS-FNB alone (EUS-FNB group) with a conventional sampling algorithm of EUS-FNA with ROSE followed by EUS-FNB(EUS-FNA/B group) in nonpancreas adenocarcinoma lesions. Methods: Retrospective cohort study of subjects who underwent EUS sampling of nonpancreatic adenocarcinoma lesions between February2011 and May 2013. Results: Over the study period, there were 43 lesions biopsied in 41 unique patients in the EUS-FNB group and 53 patients in the EUSFNA/B group. Overall diagnostic accuracy was similar between the EUS-FNB and EUS-FNA/B groups (83.7% vs. 84.9%; p=1.0). In thesubgroup of subepithelial mass lesions, diagnostic accuracy remained similar in the EUS-FNB and EUS-FNA/B groups (81.0% and 70.6%;p=0.7). EUS-FNB procedures were significantly shorter than those in the EUS-FNA/B group (58.4 minutes vs. 73.5 minutes; p<0.0001). Conclusions: EUS-FNB without on-site cytology provides a high diagnostic accuracy in nonpancreas adenocarcinoma lesions. There appearsto be no additive benefit with initial EUS-FNA but this requires further study in a prospective study.

CRISPR-Cas genome editing in Chlamydomonas reinhardtii CC125 to increase lipid content by knock-out of STA gene

( Rajesh Kona ),이정섭,심상준 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0