On a Type of Semi-Symmetric Non-Metric Connection on Riemannian Manifolds

BARMAN, AJIT Department of Mathematics 2015 Kyungpook mathematical journal Vol.55 No.3

The object of the present paper is to characterize a Riemannian manifold admitting a type of semi-symmetric non-metric connection.

On LP-Sasakian Manifolds admitting a Semi-symmetric Non-metric Connection

Barman, Ajit Department of Mathematics 2018 Kyungpook mathematical journal Vol.58 No.1

In this paper, the object is to study a semi-symmetric non-metric connection on an LP-Sasakian manifold whose concircular curvature tensor satisfies certain curvature conditions.

Trimetallic Pd@Au@Pt nanocomposites platform on -COOH terminated reduced graphene oxide for highly sensitive CEA and PSA biomarkers detection

Barman, S.C.,Hossain, M.F.,Yoon, Hyosang,Park, Jae Y. Elsevier 2018 Biosensors & bioelectronics Vol.100 No.-

<P><B>Abstract</B></P> <P>In this paper, a trimetallic Pd@Au@Pt nanocomposites platform on -COOH terminated reduced graphene oxide (COOH-rGO) was newly developed for sensing carcinoembryonic antigen (CEA) and prostate specific antigen (PSA) biomarkers. Trimetallic electro-catalytic surfaces were prepared by the electrodeposition of noble metals (Pd@Au@Pt) nanoparticles on COOH- rGO. After EDC/NHS treatment, the anti-CEA and anti-PSA were immobilized separately on two different platforms. Under optimized conditions, the platforms were analyzed by cyclic voltammetry and differential pulse voltammetry (DPV). The platform shows good electro catalytic activity, high sensitivity, and acceptable stability for sensing CEA and PSA biomarkers. For CEA, we obtained sensitivity of 0.099 ± 0.007µAng<SUP>−1</SUP> ml, wide linear range from 12pgml<SUP>−1</SUP> to 85ngml<SUP>−1</SUP> and a limit of detection (LOD) of 8pgml<SUP>−1</SUP>, while for PSA sensitivity is 0.267 ± 0.02µAng <SUP>−1</SUP> ml, wide linear range from 3pgml<SUP>−1</SUP> to 60ngml<SUP>−1</SUP> and LOD of 2pgml<SUP>−1</SUP>. The validation of the platform was observed through standard addition method. Thus, the sensing platform could be used for the point of care detection of CEA and PSA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> -COOH terminated reduced graphene oxide (COOH- rGO) was newly developed. </LI> <LI> The developed trimetallic Pd@Au@Pt high catalytic nanocomposites platform was demonstrated for carcinoembryonic antigen (CEA) and prostate specific antigen (PSA) biomarker detection. </LI> <LI> For CEA, we obtained a wide linear range from 12 pg ml<SUP>−1</SUP> to 85 ng ml<SUP>−1</SUP> and a limit of detection (LOD) of 8 pg ml<SUP>−1</SUP>. </LI> <LI> For PSA we obtained a wide linear range from 3 pg ml<SUP>−1</SUP> to 60 ng ml<SUP>−1</SUP> and a LOD of 2 pg ml<SUP>−1</SUP>. </LI> </UL> </P>

LEHMER'S GENERALIZED EULER NUMBERS IN HYPERGEOMETRIC FUNCTIONS

Barman, Rupam,Komatsu, Takao Korean Mathematical Society 2019 대한수학회지 Vol.56 No.2

In 1935, D. H. Lehmer introduced and investigated generalized Euler numbers $W_n$, defined by $${\frac{3}{e^t+e^{wt}e^{w^2t}}}={\sum\limits_{n=0}^{\infty}}W_n{\frac{t^n}{n!}}$$, where ${\omega}$ is a complex root of $x^2+x+1=0$. In 1875, Glaisher gave several interesting determinant expressions of numbers, including Bernoulli and Euler numbers. These concepts can be generalized to the hypergeometric Bernoulli and Euler numbers by several authors, including Ohno and the second author. In this paper, we study more general numbers in terms of determinants, which involve Bernoulli, Euler and Lehmer's generalized Euler numbers. The motivations and backgrounds of the definition are in an operator related to Graph theory. We also give several expressions and identities by Trudi's and inversion formulae.

Gold Nanoparticles Assembled Chemically Functionalized Reduced Graphene Oxide Supported Electrochemical Immunosensor for Ultra-Sensitive Prostate Cancer Detection

Barman, S. C.,Hossain, M. F.,Park, Jae Y. The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.6

<P>An ultra-sensitive electrochemical immunosensor was successfully developed to accurately detect prostate specific antigen. To improve the performance of immunosensor, it was fabricated by using hybrid nano-structured electrodes of high performance chemically functionalized reduced graphene oxide (CRGO) and gold nanoparticles (AuNPs) followed by covalently immobilized monoclonal anti-PSA antibody. We optimized the immunosensor, under different conditions using cyclic voltammetry and differential pulse voltammetry. We obtained a low detection limit of 3 pg mL(-1) and wide linear range from 6 pg mL(-1) to 30 ng mL(-1), good reproducibility, selectivity, and stability. Finally, human serum samples were analyzed. The obtained recovery range was from 97% to 110% with relative standard deviation (RSD) of 3.88%. Thus, the developed immunosensor can provide a great potential in clinical and diagnostic applications. (C) 2017 The Electrochemical Society. All rights reserved.</P>

In vitro Nutrient Digestibility, Gas Production and Tannin Metabolites of Acacia nilotica Pods in Goats

Barman, K.,Rai, S.N. Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.1

Six total mixed rations (TMR) containing 0, 4, 6, 8, 10, 12% tannin (TMR I-VI), using Accacia nilotica pods as a source of tannin, were used to study the effect of Acacia tannin on in vitro nutrient digestibility and gas production in goats. This study also investigated the degraded products of Acacia nilotica tannin in goat rumen liquor. Degraded products of tannins were identified using high performance liquid chromatography (HPLC) at different hours of incubation. In vitro digestibility of dry matter (IVDMD) and organic matter (IVOMD) were similar in TMR II, and I, but declined (p<0.05) thereafter to a stable pattern until the concentration of tannin was raised to 10%. In vitro crude protein digestibility (IVCPD) decreased (p<0.05) with increased levels of tannins in the total mixed rations. Crude protein digestibility was much more affected than digestibility of dry matter and organic matter. In vitro gas production (IVGP) was also reduced (p<0.05) with increased levels of tannins in the TMR during the first 24 h of incubation and tended to increase (p>0.05) during 24-48 h of incubation. Gallic acid, phloroglucinol, resorcinol and catechin were identified at different hours of incubation. Phloroglucinol and catechin were the major end products of tannin degradation while gallate and resorcinol were produced in traces. It is inferred that in vitro nutrient digestibility was reduced by metabolites of Acacia nilotica tannins and ruminal microbes of goat were capable of withstanding up to 4% tannin of Acacia nilotica pods in the TMR without affecting in vitro nutrient digestibility.

Carboxyl Terminated Reduced Graphene Oxide (Crbxl-RGO) and Pt Nanoparticles Based Ultra-Sensitive and Selective Electrochemical Biosensor for Glutamate Detection

Barman, Sharat Chandra,Hossain, M. F.,Yoon, Hyosang,Park, Jae Y. The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.7

<P>Here, an ultrasensitive enzymatic electrochemical L-glutamate sensor was successfully developed and characterized using carboxyl terminated reduce graphene oxide (Crbxl-RGO) and Pt nanoparticles as a supporting and catalyzing medium. Crbxl-RGO was drop casted on the Au substrate and Pt nanoparticles were electrodeposited on Crbxl-RGO/Au modified substrate. L-Glutamate dehydrogenase-chitosan (GLDH-chit) composite was immobilized on the sensing area using EDC/NHS bonding material treatment. The physical characteristic of the sensor matrix was monitored through field emission scanning electron microscopy (FESEM), and X-ray photoelectron spectroscopy (XPS), Energy dispersive spectroscopy (EDX) and analytical characterization was analyzed by using cyclic voltammetry (CV), electrochemical impedance spectroscopy and differential pulse voltammetry (DPV). Under optimized condition the sensor showed sensitivity of 973 +/- 4 mu A/mMcm(2), wide linear range 0.004-0.9 mM and limit of detection 0.1 mu M that indicates promising approach for detecting L-glutamate. (c) 2018 The Electrochemical Society.</P>

Soft surfactant-assisted uniformly dispersed platinum nanoparticles for high performance electrochemical non-enzymatic glucose sensing platform

Barman, Sharat Chandra,Hossain, Mohammad Faruk,Park, Jae Yeong Elsevier 2018 Journal of Electroanalytical Chemistry Vol.824 No.-

<P><B>Abstract</B></P> <P>In this study, highly catalytic platinum nanoparticles (PtNPs) were synthesized on polished Au thin-film electrode using surfactant assisted electrochemical technique (SAET) for a high-performance non-enzymatic glucose sensor. Residual surfactants on the fabricated electrodes were removed by dipping into a tetrahydrofuran (THF) solution. The physical characteristics of the electrodes were investigated through FESEM, XRD, and EDX, and the analytical analyses were demonstrated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and amperometry. After optimization considering the NP deposition potential and time, dipping time in THF, the fabricated biosensor showed a promising electro-oxidation towards glucose in terms of high sensitivity of 5.87 ± 0.13 μAmM<SUP>−1</SUP> cm<SUP>−2</SUP>, detection limit of 0.235 μM, wide linear range from 0.25–36 mM, fast response lower than 5 s, and good reproducibility and stability. The proposed SAET can be applied to uniform deposition and dispersion of other nanoparticles for numerous applications. Therefore, the proposed sensing platform can be useful to monitor glucose in diagnostic bioprocess monitoring and environmental monitoring.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PtNPs has been newly synthesized by using soft surfactant PS-b-PEO. </LI> <LI> High dispersion of PtNPs on the surface of electrode was obtained using SAET. </LI> <LI> Optimum removal of surfactant by sinking in THF for 20 min at 40 °C. </LI> <LI> High sensitivity of 10.87 μAmM<SUP>−1</SUP> cm<SUP>−2</SUP>, limit of detection is 0.235 μM, and fast response <5 s. </LI> <LI> Wide linear range from 0.5 to 36 mM, good reproducibility, and stability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Non-negative Matrix Factorization Based Text Mining: Feature Extraction and Classification

Barman, P. C.,Iqbal, N.,Lee, S.-Y. SPRINGER-VERLAG 2006 Lecture Notes in Computer Science Vol.4233 No.-

Alkali pretreatment of wheat straw (Triticum aestivum) at boiling temperature for producing a bioethanol precursor.

Barman, Dhirendra Nath,Haque, Md Azizul,Kang, Tae Ho,Kim, Min Keun,Kim, Jungho,Kim, Hoon,Yun, Han Dae Japan Society for Bioscience, Biotechnology, and A 2012 Bioscience, Biotechnology, and Biochemistry Vol.76 No.12

<P>We evaluated the effect of dilute sodium hydroxide (NaOH) on wheat straw at boiling temperature for removing lignin and increasing the yield of reducing sugar. Various concentrations of NaOH (0.5% to 2%) were used for pretreating wheat straw at 105 C for 10 min. Scanning electron microscopy, atomic force microscopy, and Fourier transform infrared spectroscopy studies revealed that the 2% NaOH-pretreated sample exposed more cellulose fiber. The maximum respective removal of lignin and hemicellulose was 70.3% and 68.2% from the 2% NaOH-pretreated liquor. The reducing sugar yield was 84.6% using an enzyme dose containing 20 FPU of cellulase, 40 IU of β-glucosidase and 4 FXU of xylanase/g of substrate. However, 2% NaOH-treated wheat straw had the lowest crystalline index of 52.5%, due to destructured cellulose fibers. The results indicate the effectiveness of producing the bioethanol precursor from wheat straw by using 2% NaOH at boiling temperature.</P>