Search results for: Sanjay K. Srivastava

Items from 1 to 20 out of 77 results

article

Synthesis, spectral characterization, reactivity and DFT studies of novel ligand phenylseleno benzylacetate (L) and its complexes with group 12 metal chlorides

Muzzaffar A. Bhat, Shabir H. Lone, Sabeena Ali, Sanjay K. Srivastava

Journal of Molecular Structure > 2018 > 1171 > C > 233-242

C₆H₅Se^-Na⁺ (generated in-situ by NaBH₄ reduction of (C₆H₅Se)₂) on reaction with bromo benzylacetate under N₂ atmosphere results in the formation of phenylseleno benzylacetate (L) as viscous oil. Its complexes having the formula [ZnCl₂(L)] (1), [CdCl₂(L)] (2), [HgCl₂(L)] (3) have been prepared. L and its complexes 1–3 were characterized on the basis of physico-chemical and spectral (FT-IR, Mass, ¹H,...

article

H/BETA Zeolite mediated synthesis of t-butyl carbazate based Schiff bases. A versatile catalyst for the synthesis of highly functionalized imines

Muzzaffar A. Bhat, Muzzaffar A. Mir, Shabir H. Lone, Sheikh A. Majid, more

Journal of Porous Materials > 2019 > 26 > 3 > 687-692

A convenient and facile synthesis of tertiary butyl carbazate based Schiff base compounds is accomplished using an efficient high yielding and reusable H-BETA catalyst in ethanol. The catalyst was prepared and characterised by FT-IR, XRD, DSC-TGA, BET and SEM analysis. The heterogenous catalyst is selective, easily recovered, can be used for up to five times without obvious loss in catalytic activity...

article

Enhanced photovoltaic performance of PEDOT:PSS/Si solar cells using hierarchical light trapping scheme

Prashant Singh, Sanjay K. Srivastava, B. Sivaiah, P. Prathap, more

Solar Energy > 2018 > 170 > C > 221-233

Organic-inorganic hybrid solar cells have attracted tremendous research attention in recent years owing to their low fabrication cost and potentially high performance. In the present study, hierarchical structures consisting of nanostructures made over micro-textured pyramidal (MPs) silicon surface are used in PEDOT:PSS/Si heterojunction solar cells to achieve a power conversion efficiency (PCE) up...

article

Correction to: Regulation of SIRT1/AMPK axis is critically involved in gallotannin-induced senescence and impaired autophagy leading to cell death in hepatocellular carcinoma cells

Hee Young Kwon, Ju-Ha Kim, Bonglee Kim, Sanjay K. Srivastava, more

Archives of Toxicology > 2018 > 92 > 9 > 2979-2979

This article contains an error.

article

Synthesis, spectral characterization, DFT studies and biological activity of novel Ligand 1‐(2‐cyclohexyl thioethyl) piperidine and its complexes with group 12 metal chlorides

Muzzaffar A. Bhat, Shabir H. Lone, Muzzaffar A. Mir, Sheikh A. Majid, more

Applied Organometallic Chemistry > 32 > 5 > n/a - n/a

C₆H₁₁S^‐Na⁺ (generated insitu by reaction of NaOH with C₆H₁₁SH) on treatment with 1‐(2‐chloroethyl) piperidine hydrochloride under N₂ atmosphere resulted in (1‐(2‐cyclohexyl thioethyl) piperidine) (L¹) as orange solid. It's complexes having the formula [ZnCl₂. L¹] (1), [CdCl₂. (L¹)] (2) and [HgCl₂. L¹] (3) have been prepared. L¹ and its complexes 1‐3 were characterized on the basis of physico‐chemical...

article

Light intensity dependent characteristics of micro-textured Si/PEDOT:PSS heterojunction solar cell

Prashant Singh, Sanjay K. Srivastava, B. Sivaiah, Subha Laxmi, more

Journal of Materials Science: Materials in Electronics > 2018 > 29 > 6 > 5087-5097

Heterojunction solar cells made of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) and Si have attracted a lot of attention towards low-cost and efficient devices. Here, heterojunction solar cell using pristine PEDOT:PSS on micro-textured n-Si has been fabricated. Effect of light intensity on photovoltaic characteristics of PEDOT:PSS/Si cells has been investigated via current...

article

Regulation of SIRT1/AMPK axis is critically involved in gallotannin-induced senescence and impaired autophagy leading to cell death in hepatocellular carcinoma cells

Hee Young Kwon, Ju-Ha Kim, Bonglee Kim, Sanjay K. Srivastava, more

Archives of Toxicology > 2018 > 92 > 1 > 241-257

Hepatocellular carcinoma (HCC) is one of the most fatal malignancies with high mortality worldwide. Here the underlying antitumor mechanism of gallotannin was elucidated in HCC cells. Gallotannin suppressed viability and colony formation, increased subG₁ portion and also induced senescence via upregulation of p21, G₀/G₁ arrest and higher SA-β-gal activity in HepG2 and SK-Hep1 cells. However, pan-caspase...

article

Air-processed organo-metal halide perovskite solar cells and their air stability

Abhishek K. Chauhan, Pankaj Kumar, Soumya Ranjan Pal, Sanjay K. Srivastava, more

Journal of Materials Science > 2017 > 52 > 18 > 10886- 10897

We investigate and report here the air stability of air-processed mixed halide CH₃NH₃PbI_3−xCl_x perovskite solar cells. The solar cells were prepared in planar heterojunction as well as mesoscopic structures using four perovskite precursors having different wt% concentrations, viz. 13.7, 17.5, 24.1 and 38.9 wt%. Compact TiO₂ layer (TiO₂-bl) was used as electron transport layer, whereas poly(3-hexylthiophene)...

article

First structurally characterized anion exchange product of noval cyclohexane containing substituted thio piperazinium chloride [C6H11S(CH2)3C4H9N2C6H5Cl (L1Cl)]: Synthesis, crystal structure and supramolecularity of (L1NO3)

Muzzaffar Ahmad Bhat, Muzzaffar Ahmad Mir, Joseph Agim, Ray J. Butcher, more

Inorganic Chemistry Communications > 2017 > 76 > C > 8-11

[C₆H₁₁S(CH₂)₃C₄H₉N₂C₆H₅Cl (L¹Cl)] has been synthesized by reaction of cyclohexyl thiol with 1-(chlorophenyl)-4-(3-chloropropyl) piperazine hydrochloride (P¹) under dry nitrogen atmosphere. The L¹Cl on reaction with Cd(NO₃)₂ forms a compound [L¹NO₃] having NHO hydrogen bonding. The single crystal structure of the compound L¹NO₃ is solved. The characteristic feature of these reactions is the retention...

article

Nanoemulsion formulations for anti-cancer agent piplartine—Characterization, toxicological, pharmacokinetics and efficacy studies

Neel M. Fofaria, Hussaini Syed Sha Qhattal, Xinli Liu, Sanjay K. Srivastava

International Journal of Pharmaceutics > 2016 > 498 > 1-2 > 12-22

Piplartine (PL) is an alkaloid found in black-pepper and known for its anticancer activity, however, due to poor solubility and lack of proper formulation, its use for oral administration is a challenge. The objective of this study was to formulate PL into nanoemulsion drug delivery system for oral delivery and thereafter evaluate toxicity, pharmacokinetics and therapeutic efficacy. Optimized nanoemulsions...

chapter

India’s EO Pyramid for Holistic Development

V. Jayaraman, Sanjay K. Srivastava, D. Gowrisankar

Space Technologies for the Benefit of Human Society and Earth > Improving Global Resource Management and Protection of Terrestrial, Coastal and Marine Resources > 37-56

The Indian Earth Observations (EO) Programme, encompassing the space, ground and the applications segment, has practically demonstrated various roles that EO could play in catalyzing the developmental process of a nation at various levels. The present in-orbit Indian EO constellation of operational satellites and the planned missions have been a part of India’s EO strategy to have specific thematic...

chapter

EO Products for Drought Risk Reduction

Sanjay K. Srivastava, S. Bandyopadhyay, D. Gowrisankar, N.K. Shrivastava, more

Space Technologies for the Benefit of Human Society and Earth > Disaster Monitoring, Mitigation and Damage Assessment > 385-409

Drought risk reduction strategies, with enhanced focus on preparedness, mitigation and warning, are truly knowledge intensive. Their implementation demands scientific inputs on all the aspects related to drought vulnerability, which are quite dynamic, difficult to capture and also complex. While Earth Observation (EO) information products and services do have enabling roles in addressing some of these...

chapter

A Framework for Regional Cooperation on Integration of Disaster Risk Reduction and Climate Change Adaptation in South Asia

Sanjay K. Srivastava

Climate Change and Food Security in South Asia > POLICY IMPERATIVES > 569-584

Climate change has created newer grounds for disaster vulnerability in South Asia. Two third of the natural disasters the region experiences are having climate origins. In the recent times, their intensity, frequency and unpredictability are on the rise. The political leadership of the region has been sensitive to this emerging challenge. The South Asian Association for Regional Cooperation (SAARC)...

article

An effective way to analyse the performance limiting parameters of poly-crystalline silicon solar cell fabricated in the production line

Pankaj Yadav, Kavita Pandey, Brijesh Tripathi, Chandra Mauli Kumar, more

Solar Energy > 2015 > 122 > C > 1-10

This article focuses on the identification of key features that are responsible for the discrepancies in the performance of silicon solar cells fabricated on multicrystalline silicon under the identical conditions. In an experimental approach, direct current (DC) measurement coupled with alternating current (AC) characterisation technique has been employed. The scanning electron microscope analysis...

article

Modulation of signal transduction pathways by natural compounds in cancer

Alok Ranjan, Neel M. Fofaria, Sung-Hoon Kim, Sanjay K. Srivastava

Chinese Journal of Natural Medicines > 2015 > 13 > 10 > 730-742

Cancer is generally regarded as the result of abnormal growth of cells. According to World Health Organization, cancer is the leading cause of mortality worldwide. Mother nature provides a large source of bioactive compounds with excellent therapeutic efficacy. Numerous phytochemicals from nature have been investigated for anticancer properties. In this review article, we discuss several natural compounds,...

article

A derivative of epigallocatechin‐3‐gallate induces apoptosis via SHP‐1‐mediated suppression of BCR‐ABL and STAT3 signalling in chronic myelogenous leukaemia

Ji Hoon Jung, Miyong Yun, Eun‐Jeong Choo, Sun‐Hee Kim, more

British Journal of Pharmacology > 172 > 14 > 3565 - 3578

Background and PurposeEpigallocatechin‐3‐gallate (EGCG) is a component of green tea known to have chemo‐preventative effects on several cancers. However, EGCG has limited clinical application, which necessitates the development of a more effective EGCG prodrug as an anticancer agent. Experimental ApproachDerivatives of EGCG were evaluated for their stability and anti‐tumour activity in human chronic...

article

Antireflective ultra-fast nanoscale texturing for efficient multi-crystalline silicon solar cells

Sanjay K. Srivastava, Prashant Singh, Mohammad Yameen, P. Prathap, more

Solar Energy > 2015 > 115 > C > 656-666

Minimization of reflection losses is extremely important for efficient silicon solar cells made either on mono crystalline (c-) or multi-crystalline (mc-) silicon (Si) substrates. A simple and fast etching process yet effective for nano-scale texturing of mc-Si surface using silver assisted wet chemical etching is reported. This results in very low reflecting (<3%) mc-Si surface in the broad (300–1100nm)...

article

Fabrication of vertical silicon nanowire arrays on three-dimensional micro-pyramid-based silicon substrate

Prashant Singh, Sanjay K. Srivastava, M. Yameen, B. Sivaiah, more

Journal of Materials Science > 2015 > 50 > 20 > 6631-6641

Recently, a lot of attention is being paid to combine silicon nanowires (SiNWs) and the conventional micro-pyramid silicon (µT-Si) structures leading to SiNWs/µT-Si binary structures for efficient light harvesting. We report large-area fabrication of vertical SiNWs array over three-dimensional micro-pyramid structured silicon substrate through silver (Ag)-assisted electroless wet chemical etching...

article

Low temperature fabrication of PEDOT:PSS/micro-textured silicon-based heterojunction solar cells

Mohammad Yameen, Sanjay K. Srivastava, Prashant Singh, Kamini Turan, more

Journal of Materials Science > 2015 > 50 > 24 > 8046-8056

Organic/inorganic heterojunctions provide a viable option to replace the conventional high-temperature dopant diffusion-based p–n junction owing to their low manufacturing cost. Thus, there has been increasing interests in low temperature heterojunction solar cell concepts particularly polymer/silicon-based heterojunction solar cells. Here, we report fabrication of heterojunction silicon solar cells...

article

HER2 mediated de novo production of TGFβ leads to SNAIL driven epithelial-to-mesenchymal transition and metastasis of breast cancer

Parul Gupta, Sanjay K. Srivastava

Molecular Oncology > 2014 > 8 > 8 > 1532-1547

HER2 is an important determinant of poor prognosis in breast cancer patients. Studies indicate that HER2 positive tumors are mostly resistant to therapy and have high metastatic potential however, the underlying mechanisms remain unknown. In this study, MDA-MB-231 and MCF-7 breast cancer cells with their HER2 overexpressing syngeneic variants were used to delineate the role of HER2 in EMT and metastasis...

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Search results for: Sanjay K. Srivastava

Synthesis, spectral characterization, reactivity and DFT studies of novel ligand phenylseleno benzylacetate (L) and its complexes with group 12 metal chlorides

H/BETA Zeolite mediated synthesis of t-butyl carbazate based Schiff bases. A versatile catalyst for the synthesis of highly functionalized imines

Enhanced photovoltaic performance of PEDOT:PSS/Si solar cells using hierarchical light trapping scheme

Correction to: Regulation of SIRT1/AMPK axis is critically involved in gallotannin-induced senescence and impaired autophagy leading to cell death in hepatocellular carcinoma cells

Synthesis, spectral characterization, DFT studies and biological activity of novel Ligand 1‐(2‐cyclohexyl thioethyl) piperidine and its complexes with group 12 metal chlorides

Light intensity dependent characteristics of micro-textured Si/PEDOT:PSS heterojunction solar cell

Regulation of SIRT1/AMPK axis is critically involved in gallotannin-induced senescence and impaired autophagy leading to cell death in hepatocellular carcinoma cells

Air-processed organo-metal halide perovskite solar cells and their air stability

First structurally characterized anion exchange product of noval cyclohexane containing substituted thio piperazinium chloride [C6H11S(CH2)3C4H9N2C6H5Cl (L1Cl)]: Synthesis, crystal structure and supramolecularity of (L1NO3)

Nanoemulsion formulations for anti-cancer agent piplartine—Characterization, toxicological, pharmacokinetics and efficacy studies

India’s EO Pyramid for Holistic Development

EO Products for Drought Risk Reduction

A Framework for Regional Cooperation on Integration of Disaster Risk Reduction and Climate Change Adaptation in South Asia

An effective way to analyse the performance limiting parameters of poly-crystalline silicon solar cell fabricated in the production line

Modulation of signal transduction pathways by natural compounds in cancer

A derivative of epigallocatechin‐3‐gallate induces apoptosis via SHP‐1‐mediated suppression of BCR‐ABL and STAT3 signalling in chronic myelogenous leukaemia

Antireflective ultra-fast nanoscale texturing for efficient multi-crystalline silicon solar cells

Fabrication of vertical silicon nanowire arrays on three-dimensional micro-pyramid-based silicon substrate

Low temperature fabrication of PEDOT:PSS/micro-textured silicon-based heterojunction solar cells

HER2 mediated de novo production of TGFβ leads to SNAIL driven epithelial-to-mesenchymal transition and metastasis of breast cancer

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