A Critical Survey of Seaweed Diversity of Chilika Lake, India

Sahoo, Debasish,Sahu, Nivedita,Sahoo, Dinabandhu The Korean Society of Phycology 2003 ALGAE Vol.18 No.1

Preparation of ultra-porous graphene oxide using a glucose-mediated hydrothermal method for efficient removal of fluoride ions from water: kinetics, isotherms and co-existing ions studies

Sahoo Shraban Kumar,Sahoo Jitendra Kumar,Biswal Susanta Kumar,Gagan Kumar Panigrahi 한국탄소학회 2024 Carbon Letters Vol.34 No.1

Porous graphene oxide (P-GO) was successfully synthesized by using a simple glucose mediated hydrothermal method form prepared graphene oxide (GO). Then the P-GO was characterized by X-ray Powder Diffraction (XRD), Fourier-Transform Infrared (FITR), Raman, Brunauer–Emmett–Teller (BET), Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) analysis to determine the crystallinity, surface functionality, surface defect, surface area and porous nature of the material. For the comparative properties studies with P-GO, the synthesised GO was also characterised using the aforementioned analytical techniques. The formation of macroporous 2D sheet-like structure of P-GO with pore size diameters of 0.2–0.5 µm was confirmed by FESEM and TEM images. The surface area of P-GO was found to be 1272 m2/g which is much higher compare to GO (i.e., 172 m2/g) because of porous structure. P-GO was used for the adsorptive removal of F− ions from water using batch adsorption method. The highest adsorption occurs in the pH range of 5–7 with maximum adsorption capacity of 1272 mg/g. The experimental data revealed that the adsorption process obeys Langmuir monolayer isotherm model. The kinetic analysis revealed that the adsorption procedure is extremely rapid and mainly fit to the Pseudo-second-order (PSO) model. The effect of co-existing ions on fluoride adsorption capacity by P-GO decreases in the following order: PO43− > CO32− > SO42− > HCO3− > NO3− > Cl−. The mechanism of adsorption of fluoride onto the P-GO surface includes electrostatic interactions and hydrogen bonding.

PCR-SSCP of Serum Lysozyme Gene (Exon-III) in Riverine Buffalo and Its Association with Lysozyme Activity and Somatic Cell Count

Sahoo, Nihar Ranjan,Kumar, Pushpendra,Bhushan, Bharat,Bhattacharya, T.K.,Sharma, Arjava,Dayal, Sanker,Pankaj, Prabhat Kumar,Sahoo, Monalisa Asian Australasian Association of Animal Productio 2010 Animal Bioscience Vol.23 No.8

Serum lysozyme gene is one of the important genes influencing the immune system as its product can cause lysis of bacterial cell wall by cleaving the peptidoglycan layer. The present investigation on the serum lysozyme gene of Indian riverine buffalo was undertaken with the objectives to identify and characterize single nucleotide polymorphic patterns by PCR-SSCP method as well as to study the effect of different genotypes on serum lysozyme activity and somatic cell count. A total of 280 animals comprising four different famous bubaline breeds (Murrah, Mehsana, Surti and Bhadawari), spread over six different farms across the country were used for this study. A 276 bp (partial intron 2, complete exon 3 and partial intron 3) fragment of lysozyme gene was screened for polymorphism using the SSCP technique. Four genotypes namely AA, AB, BC and AC were observed, out of which BC genotype was found to be the most frequent. Among these three alleles, C allele (0.38) was most prevalent in these populations. Various SSCP allelic variants were cloned for sequencing and sequences were submitted to NCBI Genbank. From the alignment of the nucleotide sequences of various allelic variants, it was found that there were differences in 12 positions among the alleles, out of which maximum variation (at 8 places) was found in the intronic region. The allele A was closer to allele-C than allele-B. Allele B was phylogenetically equidistant from both of the other alleles. Mean lysozyme activity determined in serum samples of different animals of Murrah buffalo was $27.35{\pm}2.42\;{\mu}g$ per ml of serum, whereas the mean somatic cell count was $1.25{\pm}0.13{\times}10^5$ cells per ml of milk. The SSCP pattern-wise effects of various genotypes on lysozyme activity and SCC were analyzed. Although the mean values were apparently different in various genotypes, these differences were statistically non-significant. It can be concluded that the riverine buffaloes are sufficiently polymorphic with respect to serum lysozyme gene. The absence of AA genotype in Bhadawari breed of buffalo can be considered as a marker for breed characterization. The difference of four nucleotides in exon-3 indicates high selection pressure on the gene.

Thermal frequency analysis of FG sandwich structure under variable temperature loading

Brundaban Sahoo,Kulmani Mehar,Bamadev Sahoo,Nitin Sharma,Subrata Kumar Panda 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.77 No.1

The thermal eigenvalue responses of the graded sandwich shell structure are evaluated numerically under the variable thermal loadings considering the temperature-dependent properties. The polynomial type rule-based sandwich panel model is derived using higher-order type kinematics considering the shear deformation in the framework of the equivalent single-layer theory. The frequency values are computed through an own home-made computer code (MATLAB environment) prepared using the finite element type higher-order formulation. The sandwich face-sheets and the metal core are discretized via isoparametric quadrilateral Lagrangian element. The model convergence is checked by solving the similar type published numerical examples in the open domain and extended for the comparison of natural frequencies to have the final confirmation of the model accuracy. Also, the influence of each variable structural parameter, i.e. the curvature ratios, core-face thickness ratios, end-support conditions, the power-law indices and sandwich types (symmetrical and unsymmetrical) on the thermal frequencies of FG sandwich curved shell panel model. The solutions are helping to bring out the necessary influence of one or more parameters on the frequencies. The effects of individual and the combined parameters as well as the temperature profiles (uniform, linear and nonlinear) are examined through several numerical examples, which affect the structural strength/stiffness values. The present study may help in designing the future graded structures which are under the influence of the variable temperature loading.

Numerical buckling temperature prediction of graded sandwich panel using higher order shear deformation theory under variable temperature loading

Brundaban Sahoo,Bamadev Sahoo,Nitin Sharma,Kulmani Mehar,Subrata Kumar Panda 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.5

The finite element solutions of thermal buckling load values of the graded sandwich curved shell structure are reported in this research using a higher-order kinematic model including the shear deformation effect. The numerical buckling temperature has been computed using an in-house specialized code (MATLAB environment) prepared in the framework of the current mathematical formulation. In addition, the mathematical model includes the excess structural distortion under the influence of elevated environment via Green-Lagrange nonlinear strain. The corresponding eigenvalue equation has been solved to predict the critical buckling temperature of the graded sandwich structure. The numerical stability and the accuracy of the current solution have been confirmed by comparing with the available published results. Thereafter, the model is extended to bring out the influences of structural parameters i.e. the curvature ratio, core-face thickness ratio, support conditions, power-law indices and sandwich types on the thermal buckling behavior of graded sandwich curved shell panels.

Problems and solutions to conduct of thesis of postgraduate medical students during the COVID-19 pandemic: an insight into the students perspective

Alok Kumar Sahoo,Nitasha Mishra,Manisha Sahoo,Premangshu Ghoshal 한국의학교육학회 2023 Korean journal of medical education Vol.35 No.1

Purpose: The coronavirus disease 2019 (COVID-19) pandemic has adversely impacted medical education worldwide. However, its impact on the postgraduate medical thesis and dissertation work is still not evaluated. Through this study, we planned to find out the problems brought by the pandemic and likely alternatives and possible solutions to thrust the academic competence of postgraduate students. Methods: After obtaining institutional ethics committee approval, we sent a 13-item questionnaire to postgraduate medical students in India via various social media online platforms. Data on the impact of the COVID-19 pandemic on thesis work and alternatives/solutions to improve the research competence were collected on a Likert scale and analyzed. Results: We received a total of 398 responses out of which 377 entries were included for final analysis. The majority of participants (88%) reportedly had an adverse impact on the thesis work and out of 25% of the participants who recently submitted their around 45% had to do so without achieving the estimated sample size. The 6-month departmental review for thesis progress was seen in merely 28% of participants. Possible alternatives suggested were the maintenance of log books, task-based assessment of research methodology, departmental audits, and systematic reviews. Solutions suggested for improving the research competence of students were a compulsory research methodology curriculum, a biostatistics department in each institution, permission to conduct thesis work beyond submission time, exclusive time for research work, and financial incentives. Conclusion: Modification in the research aspect of the current postgraduate medical education is the need of the hour and the pandemic has enlightened us regarding the current weaknesses.

High performance self-charging supercapacitors using a porous PVDF-ionic liquid electrolyte sandwiched between two-dimensional graphene electrodes

Sahoo, Surjit,Krishnamoorthy, Karthikeyan,Pazhamalai, Parthiban,Mariappan, Vimal Kumar,Manoharan, Sindhuja,Kim, Sang-Jae The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.38

<P>Research on the development of all-in-one self-charging supercapacitor power cells (SCSPCs) has received increasing attention during recent years. Herein, we reported a novel SCSPC device comprising two-dimensional graphene sheets as electrodes for energy storage and a porous PVDF incorporated TEABF4 electrolyte as a solid-like piezo-polymer separator. Initially, the energy harvesting properties of porous PVDF films and the energy storage performance of the graphene based SCSPC device were evaluated separately. The porous PVDF film generated a voltage from 4 to 11 V when subjected to compressive forces of 5-20 N, respectively. The graphene SCSPC device delivered a highest specific device capacitance of 28.46 F g<SUP>−1</SUP> (31.63 mF cm<SUP>−2</SUP>) with a specific energy of 35.58 Wh kg<SUP>−1</SUP> and high-power density of 7500 W kg<SUP>−1</SUP>, respectively. Further, evaluation of the self-charging properties of the graphene SCSPC was performed by subjecting the SCSPC device to various applied compressive forces. Strikingly, the graphene SCSPC device can be charged up to 112 mV under a compressive force of 20 N within 250 seconds and the mechanism of self-charging <I>via</I> the piezo-electrochemical energy conversion process is discussed in detail. The experimental findings on the graphene SCSPC device can provide new insights towards the development of next-generation all-in-one energy conversion and storage devices.</P>

Surfaces and slabs of fractional topological insulator heterostructures

Sahoo, Sharmistha,Sirota, Alexander,Cho, Gil Young,Teo, Jeffrey C. Y. American Physical Society 2017 Physical Review B Vol.96 No.16

<P>Fractional topological insulators (FTIs) are electronic topological phases in (3 + 1) dimensions enriched by time reversal (TR) and charge U(1) conservation symmetries. We focus on the simplest series of fermionic FTIs, whose bulk quasiparticles consist of deconfined partons that carry fractional electric charges in integral units of e* = e/(2n + 1) and couple to a discrete Z(2n+1) gauge theory. We propose massive symmetry preserving or breaking FTI surface states. Combining the long-ranged entangled bulk with these topological surface states, we deduce the novel topological order of quasi-(2 + 1)-dimensional FTI slabs as well as their corresponding edge conformal field theories.</P>

Rumen Metabolic Development in Crossbred Calves Reared on Animal Protein Free Pre-Starter and Oat Hay

Sahoo, A.,Kamra, D.N.,Pathak, N.N. Asian Australasian Association of Animal Productio 2001 Animal Bioscience Vol.14 No.2

Twenty-four new born crossbred (Bos indicus$\times$Bos taurus) calves were distributed in two equal groups and assigned to two different pre-starter diets with (Group 1) and without (Group 2) fish meal to study the effect of replacement of animal protein by vegetable protein in the diet and the age of animals on ruminal metabolic development. All calves were fed colostrum for 24 h and whole milk until weaning at 8 weeks of age. Rumen fluid samples were collected on 4 d, 1 wk, and then weekly interval up to 8 wk of age. Rumen fluid samples were analysed for pH, TVFA, lactic acid and N fractions (total N, total soluble N, trichloro acetic acid (TCA) soluble N, TCA precipitable N and ammonia N). Weekly feed intake and live weight gain pattern showed an increasing trend with the advancement of age, but were similar in both groups. The pH fell steadily during 0-4 wk of age and then stabilized in later period. A close relationship (r=0.80) between starter intake and TVFA concentration was observed in both the groups. Lactic acid (meq/l) and ammonia N (mg/dl) concentration showed initial rise (0.55 and 14.97 on day 4 to 3.38 (7 wk) and 32.85 (4 wk), respectively) to fall (2.74 and 17.60) again during 8 wk of age in response to increase in dry feed consumption (10% initially to 83% of diet dry matter at 8 wk of age). The TCA precipitable fraction of N did not show any change during 0-8 wk of age. Data indicate that the metabolic changes responded rapidly to dry feed intake which did not differ in fish meal and non-fish meal groups, and a poor voluntary consumption of oat hay retards the progressive changes in live weight and rumen microbial development.

Fast-Charging High-Energy Battery-Supercapacitor Hybrid: Anodic Reduced Graphene Oxide-Vanadium(IV) Oxide Sheet-on-Sheet Heterostructure

Sahoo, Ramkrishna,Lee, Tae Hoon,Pham, Duy Tho,Luu, Thi Hoai Thuong,Lee, Young Hee American Chemical Society 2019 ACS NANO Vol.13 No.9

<P>The battery-supercapacitor hybrid (BSH) device has potential applications in energy storage and can be a remedy for low-power batteries and low-energy supercapacitors. Although several studies have investigated electrode materials (particularly for a battery-type anode material) and design for BSHs, the energy density and power density are insufficient (far from the levels required for practical applications). Herein, a hierarchical vanadium(IV) oxide on reduced graphene oxide (rGO@VO<SUB>2</SUB>) heterostructure as an anode and activated carbon on carbon cloth (AC@CC) as a cathode are proposed for fabricating an advanced BSH. The mixed valency of V ions inside the as-prepared VO<SUB>2</SUB> matrix (V<SUP>3+</SUP> and V<SUP>4+</SUP>) facilitates redox reactions at a low potential, giving rise to rGO@VO<SUB>2</SUB> as a typical anode with a working potential of 0.01-3 V (<I>vs</I> Li/Li<SUP>+</SUP>). The sheet-on-sheet heterostructured rGO@VO<SUB>2</SUB> yields a high specific capacity of 1214 mAh g<SUP>-1</SUP> at 0.1 A g<SUP>-1</SUP> after 120 cycles, with a high rate capability and stability. The rGO@VO<SUB>2</SUB>//AC@CC BSH device exhibits a maximum gravimetric energy density of 126.7 Wh kg<SUP>-1</SUP> and a maximum gravimetric power density of ∼10 000 W kg<SUP>-1</SUP> within a working voltage range of 1-4 V. Moreover, it exhibits fast charging times of 5 and 834 s with energy densities of 15.6 and 82 Wh kg <SUP>-1</SUP>, respectively.</P> [FIG OMISSION]</BR>