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  1. Article ; Online: Discovery of reversible selective monoamine oxidase B inhibitors with anti-acetylcholinesterase activity derived from 4-oxo-N-4-diphenyl butanamides.

    Jana, Srabanti / Nasreen, Tania / Singh, Sushil K

    Future medicinal chemistry

    2023  Volume 15, Issue 2, Page(s) 189–210

    Abstract: Aim: ...

    Abstract Aim:
    MeSH term(s) Monoamine Oxidase/metabolism ; Monoamine Oxidase Inhibitors/pharmacology ; Structure-Activity Relationship
    Chemical Substances Monoamine Oxidase (EC 1.4.3.4) ; Monoamine Oxidase Inhibitors
    Language English
    Publishing date 2023-02-17
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1756-8927
    ISSN (online) 1756-8927
    DOI 10.4155/fmc-2022-0169
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Book ; Online: Improving Hydrogen evolution catalytic activity of 2D carbon allotrope Biphenylene with B, N, P doping

    Singh, Mukesh / Shukla, Alok / Charkraborty, Brahmananda

    Density Functional Theory Investigations

    2023  

    Abstract: ... synthesized biphenylene and B, N, P decorated biphenylene sheet. hydrogen evolution reaction activity ... metal. We analyzed the adsorption mechanism of dopants (B, N, P) and hydrogen with Bader charge analysis ... of pristine, B, N, and P-doped BPh sheets. They indicate that P-doped biphenylene is a metal-free, powerful ...

    Abstract Using a first principles approach, we studied the hydrogen evolution reaction activity of newly synthesized biphenylene and B, N, P decorated biphenylene sheet. hydrogen evolution reaction activity of pristine biphenylene sheet is not encouraging, as it is similar to pristine graphene. The Gibbs free energy and overpotential of P(N) doped on biphenylene sheet are 0.022 (-0.092) eV and 22 (92) mV, respectively. The reported Gibbs free energy and overpotential of Pt are 0.9 eV and 90 mV. Hence doping of P(N) atom on top of biphenylene sheet improves hydrogen evolution reaction activity much better (near to) Pt metal. We analyzed the adsorption mechanism of dopants (B, N, P) and hydrogen with Bader charge analysis and density of states analysis. P and N-decoration on biphenylene sheet change its electronic structure so that one obtains improved hydrogen evolution reaction activity for P and N-doped biphenylene sheet. Furthermore, the stability of N, P decorated biphenylene at room temperature with ab initio molecular dynamics and formation energy near that of biphenylene indicate experimental feasibility. We have compared all our best hydrogen evolution reaction activity results in the reaction coordinate and volcano plots of pristine, B, N, and P-doped BPh sheets. They indicate that P-doped biphenylene is a metal-free, powerful catalyst for hydrogen evolution reaction activities.

    Comment: Total 29 pages: Manuscript (18 pages + 8 figures), Supporting Information (11 pages + 2 figures), Int. J. Hyd. Energy (in press)
    Keywords Condensed Matter - Materials Science ; Physics - Chemical Physics
    Subject code 541
    Publishing date 2023-10-02
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Metal-Organic Framework-Derived Mesoporous B-Doped CoO/Co@N-Doped Carbon Hybrid 3D Heterostructured Interfaces with Modulated Cobalt Oxidation States for Alkaline Water Splitting.

    Cha, Dun Chan / Singh, Thangjam Ibomcha / Maibam, Ashakiran / Kim, Tae Hyeong / Nam, Dong Hwan / Babarao, Ravichandar / Lee, Seunghyun

    Small (Weinheim an der Bergstrasse, Germany)

    2023  Volume 19, Issue 35, Page(s) e2301405

    Abstract: ... Thus, a 3D mesoporous heterostructure of boron (B)-doped cobalt-oxide/cobalt-metal nanohybrids embedded in NC ... and grown on a Ni foam substrate (B-CoO/Co@NC/NF) is developed as a binder-free bifunctional ...

    Abstract Heteroatom-doped transition metal-oxides of high oxygen evolution reaction (OER) activities interfaced with metals of low hydrogen adsorption energy barrier for efficient hydrogen evolution reaction (HER) when uniformly embedded in a conductive nitrogen-doped carbon (NC) matrix, can mitigate the low-conductivity and high-agglomeration of metal-nanoparticles in carbon matrix and enhances their bifunctional activities. Thus, a 3D mesoporous heterostructure of boron (B)-doped cobalt-oxide/cobalt-metal nanohybrids embedded in NC and grown on a Ni foam substrate (B-CoO/Co@NC/NF) is developed as a binder-free bifunctional electrocatalyst for alkaline water-splitting via a post-synthetic modification of the metal-organic framework and subsequent annealing in different Ar/H
    Language English
    Publishing date 2023-05-10
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2168935-0
    ISSN 1613-6829 ; 1613-6810
    ISSN (online) 1613-6829
    ISSN 1613-6810
    DOI 10.1002/smll.202301405
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Biophysical interaction between lanthanum chloride and (CG)n or (GC)n repeats: A reversible B-to-Z DNA transition

    Bhanjadeo, Madhabi M. / Nial, Partha S. / Sathyaseelan, Chakkarai / Singh, Ajit K. / Dutta, Juhi / Rathinavelan, Thenmalarchelvi / Subudhi, Umakanta

    International journal of biological macromolecules. 2022 Sept. 01, v. 216

    2022  

    Abstract: ... repeat sequences are well known model molecules to study B-Z transition in the presence of higher concentration ... employing CD spectroscopy. While LaCl₃ failed to induce B-Z transition in shorter oligonucleotides ... such as (CG)₃ and (GC)₃, a smooth B-Z transition was recorded for (CG)₆, (CG)₁₂ and (GC)₁₂ sequences ...

    Abstract The transition from right-handed to left-handed DNA is not only acts as the controlling factor for switching gene expression but also has equal importance in designing nanomechanical devices. The (CG)ₙ and (GC)ₙ repeat sequences are well known model molecules to study B-Z transition in the presence of higher concentration of monovalent cations. In this communication, we report a cyclic transition in (CG)₆ DNA using millimolar concentration of trivalent lanthanide salt LaCl₃. The controlled and reversible transition was seen in (CG)₁₂, and (GC)₁₂ DNA employing CD spectroscopy. While LaCl₃ failed to induce B-Z transition in shorter oligonucleotides such as (CG)₃ and (GC)₃, a smooth B-Z transition was recorded for (CG)₆, (CG)₁₂ and (GC)₁₂ sequences. Interestingly, the phenomenon was reversible (Z-B transition) with addition of EDTA. Particularly, two rounds of cyclic transition (B-Z-B-Z-B) have been noticed in (CG)₆ DNA in presence of LaCl₃ and EDTA which strongly suggest that B-Z transition is reversible in short repeat sequences. Thermal melting and annealing behaviour of B-DNA are reversible while the thermal melting of LaCl₃-induced Z-DNA is irreversible which suggest a stronger binding of LaCl₃ to the phosphate backbone of Z-DNA. This was further supported by isothermal titration calorimetric study. Molecular dynamics (MD) simulation indicates that the mode of binding of La³⁺ (of LaCl₃) with d(CG)₈.d(CG)₈ is through the minor groove, wherein, 3 out of 11 La³⁺ bridge the anionic oxygens of the complementary strands. Such a tight coordination of La³⁺ with the anionic oxygens at the minor groove surface may be the reason for the experimentally observed irreversibility of LaCl₃-induced Z-DNA seen in longer DNA fragments. Thus, these results indicate LaCl₃ can easily be adopted as an inducer of left-handed DNA in other short oligonucleotides sequences to facilitate the understanding of the molecular mechanism of B-Z transition.
    Keywords B-DNA ; Z-DNA ; calorimetry ; chlorides ; gene expression ; lanthanum ; molecular dynamics ; oligonucleotides ; phosphates ; titration
    Language English
    Dates of publication 2022-0901
    Size p. 698-709.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 282732-3
    ISSN 1879-0003 ; 0141-8130
    ISSN (online) 1879-0003
    ISSN 0141-8130
    DOI 10.1016/j.ijbiomac.2022.07.020
    Database NAL-Catalogue (AGRICOLA)

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  5. Book ; Online: Electronic Properties of B$_x$Al$_{1-x}$N Computed from GW Simulations

    Milne, Cody L. / Biswas, Tathagata / Singh, Arunima K.

    2023  

    Abstract: ... B$_{x}$Al$_{1-x}$N, are much less studied despite their ability to offer tunable properties ... of B$_{x}$Al$_{1-x}$N in the $x=0-1$ range using first-principles density functional theory and ... many-body perturbation theory within $GW$ approximation. All the B$_{x}$Al$_{1-x}$N structures are found ...

    Abstract Ultra-wide bandgap (UWBG) materials such as AlN and BN hold great promise for future power electronics due to their exceptional properties. They exhibit large band gaps, high breakdown fields, high thermal conductivity, and high mechanical strengths. AlN and BN have been extensively researched, however, their alloys, B$_{x}$Al$_{1-x}$N, are much less studied despite their ability to offer tunable properties by adjusting $x$. In this article, we predict the electronic properties of 17 recently predicted ground states of B$_{x}$Al$_{1-x}$N in the $x=0-1$ range using first-principles density functional theory and many-body perturbation theory within $GW$ approximation. All the B$_{x}$Al$_{1-x}$N structures are found to be UWBG materials and have band gaps that vary linearly from that of wurtzite-phase (\emph{w}) AlN (6.19 eV) to that of \emph{w}-BN (7.47 eV). The bandstructures of B$_{x}$Al$_{1-x}$N show that a direct-to-indirect bandgap crossover occurs near $x = 0.25$. Furthermore, we find that B$_{x}$Al$_{1-x}$N alloys have much larger dielectric constants than the constituent bulk materials (AlN=$9.3~\varepsilon_0$ or BN=$7.3~\varepsilon_0$), with values reaching as high as $12.1~\varepsilon_0$. These alloys are found to exhibit large dielectric breakdown fields in the range 9--35 MV/cm with a linear dependence on $x$. This work provides the much needed advancement in the understanding of the properties of B$_{x}$Al$_{1-x}$N to aid their application in next-generation devices.

    Comment: 24 pages, 5 figures
    Keywords Condensed Matter - Materials Science
    Publishing date 2023-09-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Role of High-Sensitivity Troponin-T And N-Terminal Pro B-Type Natriuretic Peptide as an Early Predictor of Myocardial Dysfunction in Aneurysmal Subarachnoid Hemorrhage: A Prospective Observational Study.

    Sharma, Amit K / Singh, Daljit / Mahajan, Bhawna / Tandon, Monica / Singh, Hukum

    Neurology India

    2022  Volume 70, Issue 4, Page(s) 1475–1480

    Abstract: ... high-sensitive Troponin-T and N-terminal pro-B-type natriuretic peptide) in early identification ... Troponin-T (hsTnT) and N-terminal pro B-type natriuretic peptide (NT pro-BNP) for 7 consecutive days was ...

    Abstract Background: Acute cardiac complications are commonly seen in aneurysmal subarachnoid hemorrhage (aSAH) patients and may vary from subclinical electrocardiographic abnormalities, or reduced ejection fraction on echocardiography, elevated levels of cardiac markers (cardiac troponin and Brain natriuretic peptide) to heart failure.
    Objective: This study was done to evaluate the role of cardiac markers (high-sensitive Troponin-T and N-terminal pro-B-type natriuretic peptide) in early identification of cardiac complications and hence dysfunction.
    Methods: All consecutive patients with aSAH without any previous cardiac history were included. At admission, neurological evaluation using Hunt and Hess grading (H and H grade), with electrocardiography to look for any changes, echocardiography for ejection fraction, and any wall motion abnormalities was also done. The serial serum levels of high-sensitive Troponin-T (hsTnT) and N-terminal pro B-type natriuretic peptide (NT pro-BNP) for 7 consecutive days was measured with hsTnT >0.14 ng/ml and NT pro-BNP >150 pg/mL considered elevated.
    Results: A total of 69 patients were included. The elevated peak level of hsTnT and NT pro-BNP was seen in 55.1% and 69.6% of patients. A positive correlation was seen between hsTnT (P = 0.033) and NT pro-BNP (P = 0.011) and poor SAH grade (H and H grade 3-5), similarly, abnormal ECG also significantly correlated with elevated peak hsTnT (P = 0.002) and NT proBNP (P = 0.000). Also, significant difference in peak hsTnT (P = 0.000) and NT-proBNP (P = 0.000) in patients with or without reduced ejection fraction (EF).
    Conclusion: The elevated peak levels of hsTnT and NTproBNP along with ECG and echocardiography abnormalities may help in early identification of myocardial injury, hence cardiac dysfunction.
    MeSH term(s) Biomarkers ; Cardiomyopathies/diagnosis ; Cardiomyopathies/pathology ; Humans ; Natriuretic Peptide, Brain/chemistry ; Peptide Fragments ; Subarachnoid Hemorrhage/complications ; Subarachnoid Hemorrhage/pathology ; Troponin T/chemistry ; Troponin T/pharmacology
    Chemical Substances Biomarkers ; Peptide Fragments ; Troponin T ; pro-brain natriuretic peptide (1-76) ; Natriuretic Peptide, Brain (114471-18-0)
    Language English
    Publishing date 2022-08-13
    Publishing country India
    Document type Journal Article ; Observational Study
    ZDB-ID 415522-1
    ISSN 1998-4022 ; 0028-3886
    ISSN (online) 1998-4022
    ISSN 0028-3886
    DOI 10.4103/0028-3886.355116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Responses of pea plants to elevated UV-B radiation at varying nutrient levels: N-metabolism, carbohydrate pool, total phenolics and yield.

    Singh, Suruchi / Agrawal, Shashi B / Agrawal, Madhoolika

    Functional plant biology : FPB

    2020  Volume 42, Issue 11, Page(s) 1045–1056

    Abstract: The effects of elevated UV-B (280-315nm) were assessed on nitrogen metabolism, carbohydrate pool ... total phenolics, photosynthetic pigments, UV-B absorbing compounds, variables related ... background NPK level (F0); recommended NPK (F1) and recommended NK+1.5×recommended P (F2) and the UV-B levels ...

    Abstract The effects of elevated UV-B (280-315nm) were assessed on nitrogen metabolism, carbohydrate pool, total phenolics, photosynthetic pigments, UV-B absorbing compounds, variables related to oxidative stress, biomass and yield of pea plants grown under various levels of NPK. The NPK levels assayed were: background NPK level (F0); recommended NPK (F1) and recommended NK+1.5×recommended P (F2) and the UV-B levels were: control (C) and elevated (T). The responses of T plants varied with different combinations of NPK. Yield reduced under elevated UV-B at all NPK levels with maximum reduction in F0T and minimum reduction in F1T. Leghaemoglobin content was reduced under elevated UV-B at all NPK levels. Maximum increase in malondialdehyde content recorded in F0T plants corresponded with higher superoxide and hydrogen peroxide contents. Nitrite reductase activity decreased significantly under UV-B at all NPK levels, but nitrate reductase activity increased significantly in F1T and F2T. Maximum reduction in C:N ratio of leaves in F2T plants suggests competition between sucrose synthesis and nitrate reduction under additional P level. The study concludes that application of recommended level of NPK caused least changes in N metabolism leading to minimum yield losses due to elevated UV-B stress.
    Language English
    Publishing date 2020-06-02
    Publishing country Australia
    Document type Journal Article
    ZDB-ID 2071582-1
    ISSN 1445-4416 ; 1445-4408
    ISSN (online) 1445-4416
    ISSN 1445-4408
    DOI 10.1071/FP15003
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Group 13 element containing conformationally rigid "N-E-N" heteroatomic bridged [3.3](2,6)pyridinophanes (E = B, Al).

    Bawari, Deependra / Negi, Chandrakala / Jaiswal, Kuldeep / Prashanth, Billa / Choudhury, Angshuman Roy / Singh, Sanjay

    Chemical communications (Cambridge, England)

    2018  Volume 54, Issue 64, Page(s) 8857–8860

    Abstract: ... heteroatom N-E-N bridges (E = B, Al). The presence of B and Al as acceptor atoms in the bridges and ...

    Abstract The first examples of group 13 element containing pyridinophanes have been assembled using heteroatom N-E-N bridges (E = B, Al). The presence of B and Al as acceptor atoms in the bridges and their coordination with pyridine nitrogen has a very strong influence on the conformational rigidity of the pyridinophanes.
    Language English
    Publishing date 2018-08-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c8cc05154b
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Unlocking SGK1 inhibitor potential of bis-[1-N,7-N, pyrazolo tetraethoxyphthalimido{-4-(3,5-Dimethyl-4-(spiro-3-methylpyazolo)-1,7-dihydro-1H-dipyrazolo[3,4-b;4',3'-e]pyridin-8-yl)}]p-disubstituted phenyl compounds: a computational study.

    Verma, Abhishek Kumar / Ahmed, Sk Faisal / Hossain, Md Shahadat / Bhojiya, Ali Asger / Upadhyay, Sudhir K / Srivastava, Abhishek K / Singh, Nripendra / Harina, Harina / Rahaman, Md Mizanur / Bahadur, Newaz Mohammed

    Journal of biomolecular structure & dynamics

    2021  Volume 40, Issue 24, Page(s) 13412–13431

    Abstract: ... simulation of the Bis-[1-N,7-N, Pyrazolo tetraethoxyphthalimido{-4-(3,5-Dimethyl-4-(spiro-3-methylpyazolo)-1 ... 7-dihydro-1H-dipyrazolo[3,4-b;4',3'-e]pyridin-8-yl)}]p-disubstituted phenyl compoundsand reference ...

    Abstract SGK1 (Serum and Glucocorticoid Regulated Kinase 1), a serine/threonine kinase that is activated by various stimuli, including serum and glucocorticoids. It controls inflammation, apoptosis, hormone release, neuro-excitability and cell proliferation, all of which play an important role in cancer progression and metastasis. SGK1 was recently proposed as a potential drug target for cancer, diabetes, and neurodegenerative diseases. In this study, molecular docking, physiochemical, toxicological properties and molecular dynamic simulation of the Bis-[1-N,7-N, Pyrazolo tetraethoxyphthalimido{-4-(3,5-Dimethyl-4-(spiro-3-methylpyazolo)-1,7-dihydro-1H-dipyrazolo[3,4-b;4',3'-e]pyridin-8-yl)}]p-disubstituted phenyl compoundsand reference EMD638683 against new SGK1 target protein. Compared to the reference inhibitor EMD638683, we choose the best compounds (series 2-6) based on the binding energy (in the range from -11.0 to -10.6 kcal/mol). With the exception of compounds 2 and 6, none of the compounds posed a risk for AMES toxicity or carcinogenicity due to their toxicological properties. 100 ns MD simulation accompanied by MM/PBSA energy calculations and PCA. According to MD simulation results, the binding of compounds 3, 4 and 5 stabilizes the SGK1 structure and causes febrile conformational changes compared to EMD638683. As a result of this research, the final selected compounds 3, 4 and 5 can be used as scaffolds to develop promising SGK1 inhibitors for the treatment of related diseases such as cancer.Communicated by Ramaswamy H. Sarma.
    MeSH term(s) Molecular Docking Simulation ; Protein Serine-Threonine Kinases/chemistry ; Benzamides/pharmacology ; Molecular Dynamics Simulation
    Chemical Substances EMD 638683 ; Protein Serine-Threonine Kinases (EC 2.7.11.1) ; Benzamides
    Language English
    Publishing date 2021-10-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2021.1988711
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  10. Book ; Online: Effect of N, C and B interstitials on the structural and magnetic properties of alloys with Cu$_3$Au-structure

    Opahle, Ingo / Singh, Harish K. / Zemen, Jan / Gutfleisch, Oliver / Zhang, Hongbin

    2020  

    Abstract: ... B, C and N atoms on 21 alloys reported to crystallize in the cubic Cu$_3$Au structure. It is shown ... of stable alloys with interstitial concentrations above 5\% is expected. In Ni$_3$Mn interstitial N induces ... a tetragonal distortion with substantial uniaxial MAE for realistic N concentrations. Mn$_3X$N$_x$ ($X$=Rh, Ir ...

    Abstract High-throughput density functional calculations are used to investigate the effect of interstitial B, C and N atoms on 21 alloys reported to crystallize in the cubic Cu$_3$Au structure. It is shown that the interstitials can have a significant impact on the magneto-crystalline anisotropy energy (MAE), the thermodynamic stability and the magnetic ground state structure, making these alloys interesting for hard magnetic, magnetocaloric and other applications. For 29 alloy/interstitial combinations the formation of stable alloys with interstitial concentrations above 5\% is expected. In Ni$_3$Mn interstitial N induces a tetragonal distortion with substantial uniaxial MAE for realistic N concentrations. Mn$_3X$N$_x$ ($X$=Rh, Ir, Pt and Sb) are identified as alloys with strong magneto-crystalline anisotropy. For Mn$_3$Ir we find a strong enhancement of the MAE upon N alloying in the most stable collinear ferrimagnetic state as well as in the non-collinear magnetic ground state. Mn$_3$Ir and Mn$_3$IrN show also interesting topological transport properties. The effect of N concentration and strain on the magnetic properties are discussed. Further, the huge impact of N on the MAE of Mn$_3$Ir and a possible impact of interstitial N on amorphous Mn$_3$Ir, a material that is indispensable in today's data storage devices, are discussed at hand of the electronic structure. For Mn$_3$Sb, non-collinear, ferrimagnetic and ferromagnetic states are very close in energy, making this material potentially interesting for magnetocaloric applications. For the investigated Mn alloys and competing phases, the determination of the magnetic ground state is essential for a reliable prediction of the phase stability.

    Comment: 12 pages, 9 figures
    Keywords Condensed Matter - Materials Science
    Subject code 669
    Publishing date 2020-01-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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