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Sandeep Kumar Bhoriwal,Sunil Kumar,SVS Deo,Jyoti Sharma,Ashutosh Mishra,Naveen Kumar,Jyoutishman Saikia,Kunal Dhall 한국간담췌외과학회 2021 Annals of hepato-biliary-pancreatic surgery Vol.25 No.2
Backgrounds/Aims: Morbidity following Whipple’s surgery largely depends upon the pancreatic stump anastomosis leak. Pancreaticogastrostomy is one of the techniques of pancreatic stump reconstruction and is described variously in the literature. Duct to mucosa pancreaticogastrostomy is described either by a large 3-4 cm posterior gastrotomy or by small gastrotomy of 2-3 mm with the use of internal stents along with. We describe clinical outcomes and technique of 2 layer end to side pancreatico-gastrostomy by a small posterior gastrotomy without the use of internal stents. Methods: Hospital records of 35 patients where the technique of, small posterior gastrotomy end to side duct to mucosa pancreatico-gastrostomy without internal stents, was used for pancreatic stump reconstruction were studied retrospectively. The data were analyzed for demographic details, stage of the disease, and short term outcomes related to surgical procedure. Results: The mean duration of surgery was 7.4 hours. Grade A, B, and C POPF were observed in 10 (28.5%), 3 (8.5%), and 1 (2.8%) of patients respectively. The mean time to remove pancreatic drain was 9 days, and the mean time to start oral feeds was 8.9 days. The mean hospital stay was 12.9 days (07-26). Thirty days mortality was 2.8%. Conclusions: Unstented duct to mucosa end to side pancreatico-gastrostomy technique is comparable with other pancreatico-gastrostomy techniques in outcomes in terms of POPF, morbidity, mortality, and hospital stay. However, to establish the superiority or inferiority of this technique, a larger study is recommended.
Verma Sandeep Kumar,Das Ashok Kumar,Gantait Saikat,Panwar Yogita,Kumar Vinay,Brestic Marian 한국탄소학회 2022 Carbon Letters Vol.32 No.2
Nanomaterials (NMs) are gradually becoming pervasive in the modern world, entering every application for improving the quality of life. Multifaceted uses of NMs in curing diseases, biomedical instrumentation, bioimaging, drugs, and gene delivery, display devices, nanosensors, and biomarkers in several fields ranging from agriculture to industries, healthcare, and environment, have been well recognized. Carbon-based nanomaterials (CNMs) constitute a major type of NMs with broad-spectrum applications including their uses in agriculture. These are synthesized in large quantities via synthetic and biological approaches. Biological approaches are gaining appreciation and momentum, owing to the advantages associated with them, major being their environment friendly or ‘Green’ nature. This topical review focuses on the preparation of CNMs using natural resources, i.e., using the Green Nanotechnology. The up-to-date compilation presented here includes most of the popular green technological methods of producing the CNMs and their immediate uses as anticancer agents, in bio-labelling, as biosensors, in bio-remediation, in cell imaging, in fluorescent inks, and fluorescent dyes, as plant growth inducing agents, in nano-probes, in light-emitting devices and other applications. It is intended to update the reader with the state-of-the-art knowledge about the green technological methods for synthesizing CNMs, their uses, current trends, challenges, and future outlook on the topic.
TO SOLVE MATRIX GAMES WITH FUZZY GOALS USING PIECEWISE LINEAR MEMBERSHIP FUNCTIONS
SANDEEP KUMAR 장전수학회 2018 Proceedings of the Jangjeon mathematical society Vol.21 No.4
In this paper, the solution concepts are presented for a two person zero-sum matrix game with fuzzy goals using piecewise linear membership functions. This paper shows that the solution of matrix game with fuzzy goals can be determined by solving two crisp linear programming problems which are dual to each other in fuzzy sense. The fuzziness in goals is characterized through piecewise linear membership functions. One numerical example is illustrated to show the eectiveness and advantage of the proposed technique.
Antibacterial ferroelectric materials: Advancements and future directions
Sandeep Kumar,Moolchand Sharma,Till Frömling,Rahul Vaish 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Ferroelectric functional materials are known for a wide range of applications including sensors, actuators,energy harvesting devices. Very recent studies based on ferroelectric materials for environmentalcleaning and bacterial remediation add a further up-and-comingfield of application of these materials. They possess several advantages over conventional methods such as biocompatible range andsustainability. Although the research area is relatively new, some substantial experimental work hasbeen done in the last couple of years. The rationale and underlying mechanisms of different publishedreports were compiled and explained to offer a better understanding of the subject. The three majormechanisms can be divided into catalysis via a change in surface potential, mediated catalysis by theformation of reactive oxide species on the ceramic surface due to piezoelectric or pyroelectric excitation,and enhanced photocatalysis due to internal electricfields. Our goal is to provide a comprehensive reporton ferroelectric materials application in the prevention of bacterial infections and to give an outlook onfurther possible research strategies.
Immobilization of jack bean (Canavalia ensiformis) urease on gelatin and its characterization
Kumar, Sandeep,Kansal, Ajay,Kayastha, Arvind M Kyung Hee Oriental Medicine Research Center 2005 Oriental pharmacy and experimental medicine Vol.5 No.1
Jack bean urease was immobilized on gelatin beads with the help of glutaraldehyde. The optimum immobilization (67.6%) was obtained at 30mg/ml gelatin concentration, 0.5 mg/bead enzyme protein concentration, 1 % glutaraldehyde and at $4^{\circ}C$ incubation temperature. The $t_{1/2}$ of immobilized urease was approximately 90 days at $4^{\circ}C$ compared with $t_{1/2}$ of 20 days for the soluble urease, under identical condition. The apparent optimum pH shifted from 7.3 to 8.0 when the urease was immobilized. The optimum stability temperature of immobilized urease was found to be $60^{\circ}C$ while that of soluble urease was $45^{\circ}C$. Time-dependent thermal inactivation studies showed monophasic kinetics for soluble urease and immobilized urease at $70^{\circ}C$, respectively. The immobilized urease beads stored at $4^{\circ}C$ showed practically no leaching over a period of 30 days. Here we are presenting an easy and economical way of immobilizing urease on the gelatin beads making it suitable for various applications.
Rapid bacterial disinfection using low frequency piezocatalysis effect
Sandeep Kumar,Moolchand Sharma,Anuruddh Kumar,Satvasheel Powar,Rahul Vaish 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
The present work is the systematic study of ferrocatalysis, ferro-photocatalysis, piezocatalysis and piezophotocatalysiseffects for bacterial degradation. The investigation revealed the ferrocatalysis drivenbacterial degradation rate can be improved with incorporation of light of suitable wavelength, vibrationand combination of both. Complete bacterial disinfection was achieved through piezo-photocatalysiseffect using poled BaTiO3 (BT) ceramic within 30 min of exposure. Bacterial degradation was observedusing surface potential generated on the surface of BT during mechanical vibration. Interestingly, it wasfound that lower frequency (8 Hz) was able to develop sufficient voltage to trigger bactericidal effect. Scanning electron microscopy was used to study effect of catalytic processes on the morphology ofbacterial cells.
Kumar Sandeep,Ngo Van Tho,Park Jeong,Ham Kyung‐Sik,Singh Vivek K.,Nam Sang‐Ho,Lee Yonghoon 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.5
Strontium (Sr) is an element of toxicological concern due to its close chemical proximity to Ca. In this work, Sr in sea salts collected from China and South Korea was analyzed by laser-induced breakdown spectroscopy (LIBS). The precision could be improved by using multiple filter-paper sampling and intensity normalization using a weak Na I line as a reference signal. The analyte signal variation between filter-paper pieces as well as that within a single filter-paper piece could be corrected by the suggested method. The limit of detection of ~2 ppm and the precision of ~5% could be obtained. As a measure of accuracy, the root-mean-square error was estimated to be 9 ppm. The multiple filter-paper sampling can be performed easily on the salt production sites and improves the LIBS analysis precision resulting to sufficient quantification capability for minor metallic elements in edible sea salt products.
GEODESIC SEMI E-PREINVEX FUNCTIONS ON RIEMANNIAN MANIFOLDS
SANDEEP KUMAR PORWAL 한국전산응용수학회 2018 Journal of applied mathematics & informatics Vol.36 No.5
Several classes of functions, named as semi E-preinvex func- tions and semilocal E-preinvex functions and their properties are studied by various authors. In this paper we introduce the geodesic concept over two types of problems rst is semi E-preinvex functions and another is semilocal E-preinvex functions on Riemannian manifolds and study some of their properties.
Probabilistic free vibration analysis of Goland wing
Kumar, Sandeep,Onkar, Amit Kumar,Manjuprasad, M. The Society for Aerospace System Engineering 2019 International Journal of Aerospace System Engineer Vol.6 No.2
In this paper, the probabilistic free vibration analysis of a geometrically coupled cantilever wing with uncertain material properties is carried out using stochastic finite element (SFEM) based on first order perturbation technique. Here, both stiffness and damping of the system are considered as random parameters. The bending and torsional rigidities are assumed as spatially varying second order Gaussian random fields and represented by Karhunen Loeve (K-L) expansion. Here, the expected value, standard deviation, and probability distribution of random natural frequencies and damping ratios are computed. The results obtained from the present approach are also compared with Monte Carlo simulations (MCS). The results show that the uncertain bending rigidity has more influence on the damping ratio and frequency of modes 1 and 3 while uncertain torsional rigidity has more influence on the damping ratio and frequency of modes 2 and 3.