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Surface energy and wettability of van der Waals structures
Annamalai, M.,Gopinadhan, K.,Han, S.,Saha, S.,Park, H.,Cho, E.,Kumar, B.,Patra, A.,Kim, S. W.,Venkatesan, T. Royal Society of Chemistry 2016 Nanoscale Vol.8 No.10
<P>The wetting behaviour of surfaces is believed to be affected by van der Waals (vdW) forces; however, there is no clear demonstration of this. With the isolation of two-dimensional vdW layered materials it is possible to test this hypothesis. In this paper, we report the wetting behaviour of vdW heterostructures which include chemical vapor deposition (CVD) grown graphene, molybdenum disulfide (MoS2) and tungsten disulfide (WS2) on few layers of hexagon boron nitride (h-BN) and SiO2/Si. Our study clearly shows that while this class of two-dimensional materials are not completely wetting transparent, there seems to be a significant amount of influence on their wetting properties by the underlying substrate due to dominant vdW forces. Contact angle measurements indicate that graphene and graphene-like layered transitional metal dichalcogenides invariably have intrinsically dispersive surfaces with a dominating London-vdW force-mediated wettability.</P>
N-H and S-H insertions over Cu(I)-zeolites as heterogeneous catalysts
Saha, P.,Jeon, H.,Mishra, P.K.,Rhee, H.W.,Kwak, J.H. Elsevier 2016 Journal of molecular catalysis Chemical Vol.417 No.-
<P>N-H and S-H insertion reactions of a-diazoesters into amines and thiols were conducted using various Cu(I)-zeolites, such as zeolite Y, Y USY, ZSM-5, and beta. All the Cu(I)-zeolites successfully catalyzed N-H insertion reactions with high product yields (70-82%) in aqueous solution at room temperature. Interestingly, Cu(l)-USY (Si/Al = 30) showed better activity for both N-H and S-H insertion reactions than Cu(I)-Y (Si/Al= 2.6), even though they have the same structure and the same +1 oxidation state for Cu. X-ray diffraction, transmission electron microscopy, and X-ray photoemission spectroscopy analysis of the fresh and used catalysts revealed that no noticeable change in the zeolite structure, oxidation state of Cu, or sintering of Cu occurred during the reactions. Furthermore, after being recycled four times, the catalysts showed only minor activity decreases, exhibiting conversion rates 70-80% of those of the fresh catalysts, demonstrating their stability under the current reaction conditions. Temperature programmed reduction experiments showed that reduction of Cu+ to Cu degrees occurred at ca. 300 degrees C over Cu(l)-USY, while it occurred at ca. 800 degrees C over Cu(I)-Y. The significantly higher activity of Cu(I)-USY than Cu(l)-Y may be due to the more electrophilic Cu centers on Cu(l)-USY, which is highly favorable for ylide formation, and therefore facilitates N-H and S-H insertions. (C) 2016 Elsevier B.V. All rights reserved.</P>
Σ-nucleus potential studied with the(π−,K+)reaction on medium-to-heavy nuclear targets
Saha, P. K.,Noumi, H.,Abe, D.,Ajimura, S.,Aoki, K.,Bhang, H. C.,Dobashi, K.,Endo, T.,Fujii, Y.,Fukuda, T.,Guo, H. C.,Hashimoto, O.,Hotchi, H.,Imai, K.,Kim, E. H.,Kim, J. H.,Kishimoto, T.,Krutenkova, A American Physical Society 2004 PHYSICAL REVIEW C - Vol.70 No.4
Saha, Sanjit,Samanta, Pranab,Murmu, Naresh C.,Kim, Nam H.,Kuila, Tapas,Lee, Joong H. THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
<P><B>Abstract</B></P> <P>Functionalization and electrodeposition of reduced graphene oxide/hexagonal boron nitride (rGO/h-BN) superlattice was carried out by a novel one-step electrochemical process. The sulfanilic acid azochromotrop (SAA) functionalized and electrodeposited nickel foam (SAA@rGO/h-BN@Ni) electrode showed high specific capacitance of ∼1300Fg<SUP>−1</SUP>. An asymmetric supercapacitor cell (ASC) using SAA@rGO/h-BN@Ni as positive and thermally reduced GO as negative electrode showed ∼80% capacitance retention after 10,000 charge–discharge cycles. The ASC showed low relaxation time constant of ∼0.47ms along with high energy density (∼95.3Whkg<SUP>−1</SUP>) and power density (∼7200Wkg<SUP>−1</SUP>) ensuring the utility of SAA@rGO/h-BN@Ni electrode for supercapacitor application.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Saha, G.,Park, J.I.,Jung, H.J.,Ahmed, N.U.,Kayum, Md.A.,Kang, J.G.,Nou, I.S. Gauthier-Villars ; Elsevier Science Ltd 2015 Vol. No.
BRASSINAZOLE-RESISTANT (BZR) transcription factors (TFs) are primarily well known as positive regulators of Brassinosteroid (BR) signal transduction in different plants. BR is a plant specific steroid hormone, which has multiple stress resistance functions besides various growth regulatory roles. Being an important regulator of the BR synthesis, BZR TFs might have stress resistance related activities. However, no stress resistance related functional study of BZR TFs has been reported in any crop plants so far. Therefore, this study identified 15 BZR TFs of Brassica rapa (BrBZR) from a genome-wide survey and characterized them through sequence analysis and expression profiling against several abiotic stresses. Various systematic in silico analysis of these TFs validated the fundamental properties of BZRs, where a high degree of similarity also observed with recognized BZRs of other plant species from the comparison studies. In the organ specific expression analyses, 6 BrBZR TFs constitutively expressed in flower developmental stages indicating their flower specific functions. Subsequently, from the stress resistance related expression profiles differential transcript abundance levels were observed by 6 and 11 BrBZRs against salt and drought stresses, respectively. All BrBZRs showed several folds up-regulation against exogenous ABA treatment. All BrBZRs also showed differential expression against low temperature stress treatments and these TFs were proposed as transcriptional activators of CBF cold response pathway of B. rapa. Notably, three BrBZRs gave co-responsive expression against all the stresses tested here, suggesting their multiple stress resistance related functions. Thus, the findings would be helpful in resolving the complex regulatory mechanism of BZRs in stress resistance and further functional genomics study of these potential TFs in different Brassica crops.
Saha, S K,Choi, H Y,Kim, B W,Dayem, A A,Yang, G-M,Kim, K S,Yin, Y F,Cho, S-G Macmillan Publishers Limited 2017 Oncogene Vol.36 No.3
<P>Studies have reported that interactions between keratins (KRTs) and other proteins initiate signaling cascades that regulate cell migration, invasion, and metastasis. In the current study, we found that expression of KRT19 was specifically high in breast cancers and significantly correlated with their invasiveness. Moreover, knockdown of KRT19 led to increased proliferation, migration, invasion, drug resistance, and sphere formation in breast cancer cells via an upregulated NOTCH signaling pathway. This was owing to reduced expression of NUMB, an inhibitory protein of the NOTCH signaling pathway. In addition, we found that KRT19 interacts with beta-catenin/RAC1 complex and enhances the nuclear translocation of beta-catenin. Concordantly, knockdown of KRT19 suppressed the nuclear translocation of beta-catenin as well as beta-catenin-mediated NUMB expression. Furthermore, modulation of KRT19mediated regulation of NUMB and NOTCH1 expression led to the repression of the cancer stem cell properties of breast cancer patient-derived CD133(high)/CXCR4(high)/ALDH1(high) cancer stem-like cells (CSLCs), which showed very low KRT19 and high NOTCH1 expression. Taken together, our study suggests a novel function for KRT19 in the regulation of nuclear import of the beta-catenin/RAC1 complex, thus modulating the NUMB-dependent NOTCH signaling pathway in breast cancers and CSLCs, which might bear potential clinical implications for cancer or CSLC treatment.</P>