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1. Visible-Light-Mediated β-C(sp³)–H Amination of Glycosylimidates: En Route to Oxazoline-Fused/Spiro Nonclassical Bicyclic Sugars

Author:
Kumar, Amit,   et al.   ; Shaw, Mukta;     Show all 2 Author
Source:
Organic letters 2019 v.21 no.9 pp. 3108-3113
ISSN:
1523-7052
Subject:
amination; chemical bonding; diastereoselective synthesis; glycosylation; light; moieties; organic compounds; regioselectivity; sugars
Abstract:
... A straightforward route has been developed for the diastereoselective synthesis of nonclassical conformationally constrained oxazoline-fused and spiro bicyclic sugars bearing a quaternary center via selective β-C–H amination of appropriately positioned glycosylimidates. The desired transformation proceeds via the generation of imidate N-radicals under visible-light conditions followed regioselecti ...
DOI:
10.1021/acs.orglett.9b00763

2. Correction to: Long-term CO2 capture induced calcite crystallographic changes in Deccan basalt, India

Author:
Kumar, Amit,   et al.   ; Shrivastava, J. P.;     Show all 2 Author
Source:
Environmental earth sciences 2019 v.78 no.17 pp. 536
ISSN:
1866-6280
Subject:
basalt; calcite; carbon dioxide; India
Abstract:
... Unfortunately the online version of the original article has χ² calculation error in Table 2 and 3. ...
DOI:
10.1007/s12665-019-8549-9

3. Long-term CO2 capture-induced calcite crystallographic changes in Deccan basalt, India

Author:
Kumar, Amit,   et al.   ; Shrivastava, J. P.;     Show all 2 Author
Source:
Environmental earth sciences 2019 v.78 no.13 pp. 376
ISSN:
1866-6280
Subject:
basalt; calcite; calcium; carbon dioxide; carbonation; chemical bonding; crystal structure; crystals; ligands; shrinkage; temperature; India
Abstract:
... Previous basalt carbonation studies under hydrothermal-like conditions suggested high amount of calcite formation in a shorter period which is related to the andesine dissolution. However, CO₂ capture-induced structural changes in neo-formed minerals have not been studied in detail. To understand these changes, Rietveld refinement and crystallographic characterization were performed for andesine a ...
DOI:
10.1007/s12665-019-8378-x

4. Greenhouse gas measurement from Chinese freshwater bodies: A review

Author:
Kumar, Amit,   et al.   ; Yang, Tao; Sharma, M.P.;     Show all 3 Authors
Source:
Journal of cleaner production 2019 v.233 pp. 368-378
ISSN:
0959-6526
Subject:
carbon dioxide; climate change; dams (hydrology); ecoregions; freshwater; gases; greenhouse gas emissions; greenhouse gases; industry; lakes; methane; prediction; rivers; surface water; uncertainty; water power
Abstract:
... Freshwater bodies are found as significant sources of greenhouse gas to the atmosphere, but their quantitative significance is not yet clear. The rapid increase in hydropower dams and associated emissions has received much attention from hydropower industries, environmentalists, and policymakers from across the globe. The tropical/subtropical eco-regions are, particularly, considered as hotspots f ...
DOI:
10.1016/j.jclepro.2019.06.052

5. Comparative energy and techno-economic analyses of two different configurations for hydrothermal carbonization of yard waste

Author:
Kumar, Amit,   et al.   ; Akbari, Maryam; Oyedun, Adetoyese Olajire;     Show all 3 Authors
Source:
Bioresource technology reports 2019 v.7 pp. 100210
ISSN:
2589-014X
Subject:
biocoal; biomass; energy; heat; heat exchangers; hydrochars; hydrothermal carbonization; models; production costs; separators; steam; yard wastes
Abstract:
... Hydrothermal carbonization (HTC) includes conversion of wet biomass to hydrochar, a coal-like product, eliminating the need for biomass pre-drying. There has been limited focus on the techno-economic assessment of the HTC process in the literature. In this study, techno-economic models were developed to assess the economics of bio-coal production from yard waste for two different HTC plant configu ...
DOI:
10.1016/j.biteb.2019.100210

6. A study on radionuclides content and radon exhalation from soil of Northern India

Author:
Kumar, Amit,   et al.   ; Devi, Vandana; Chauhan, Rishi Pal;     Show all 3 Authors
Source:
Environmental earth sciences 2019 v.78 no.16 pp. 506
ISSN:
1866-6280
Subject:
breathing; carcinogenicity; construction materials; radioactivity; radionuclides; radon; risk; rocks; soil; soil sampling; spectroscopy; India
Abstract:
... Radioactivity dispersed in indoor environment is a consequence of exhalation of radioactive gas radon from soil, building materials, and rocks containing primordial radionuclide. The health risk for population from the radionuclides and radon exhalation rates of soils from different places in vicinity of Kurukshetra in Northern India is estimated. Radionuclides content and radon exhalation rate of ...
DOI:
10.1007/s12665-019-8512-9

7. Novel satellite based analytical model developed to predict microalgae yields in open pond raceway systems and applied to Canadian sites

Author:
Kumar, Amit,   et al.   ; Pankratz, Stan; Oyedun, Adetoyese Olajire;     Show all 3 Authors
Source:
Algal research 2019 v.39 pp. 101431
ISSN:
2211-9264
Subject:
active ingredients; algae culture; ambient temperature; biofuels; biomass; carbon dioxide; data collection; drugs; fertilizers; functional foods; lakes; latitude; life cycle assessment; medicine; microalgae; models; nitrates; nutrients; phosphates; photobioreactors; prediction; remote sensing; satellites; solar radiation; water temperature; Alberta; Arizona; Northwest Territories; Saskatchewan
Abstract:
... Interest in microalgae cultivation continues to increase based on its potential commercial value. Algae converts CO2, nitrates, phosphates and other nutrients into a biomass that can be processed into biofuels, pharmaceuticals, nutraceuticals, food, fertilizers, and other active compounds. Solar irradiance and media temperatures are key parameters in determining microalgae cultivation yield and he ...
DOI:
10.1016/j.algal.2019.101431

8. Extracellular DNA in Monochloraminated Drinking Water and Its Influence on DNA-Based Profiling of a Microbial Community

Author:
Kumar, Amit,   et al.   ; Sakcham, Bairoliya; Cao, Bin;     Show all 3 Authors
Source:
Environmental science & technology letters 2019 v.6 no.5 pp. 306-312
ISSN:
2328-8930
Subject:
DNA; biofilm; byproducts; disinfectants; disinfection; drinking water; glass fibers; microbial communities; porosity; species diversity; water distribution
Abstract:
... The interaction between biofilms and disinfectant in drinking water distribution systems (DWDS) as well as the role of this interaction in the formation of disinfection byproducts has been extensively studied in recent years. In contrast, lysis of cells and/or release of intracellular biomolecules from inactivated/damaged cells and their fate and implications are an overlooked aspect of DWDS. In p ...
DOI:
10.1021/acs.estlett.9b00185

9. A review of the mechanical and thermal properties of graphene and its hybrid polymer nanocomposites for structural applications

Author:
Kumar, Amit,   et al.   ; Sharma, Kamal; Dixit, Amit Rai;     Show all 3 Authors
Source:
Journal of materials science 2019 v.54 no.8 pp. 5992-6026
ISSN:
0022-2461
Subject:
composite polymers; graphene; mechanical properties; microscopy; polymer nanocomposites; synergism; thermal properties; thermogravimetry
Abstract:
... In the present review, the recent progress in describing the intricacies of mechanical and thermal properties of all types of graphene- and modified graphene-based polymer nanocomposites has been comprehensively examined. The effectiveness of microscopy bouquet for the intrinsic characterization of graphene family and their composites was clearly demonstrated in this research. Furthermore, the uti ...
DOI:
10.1007/s10853-018-03244-3

10. A basic helix loop helix transcription factor, AaMYC2-Like positively regulates artemisinin biosynthesis in Artemisia annua L.

Author:
Kumar, Amit,   et al.   ; Majid, Ishfaq; Abbas, Nazia;     Show all 3 Authors
Source:
Industrial crops and products 2019 v.128 pp. 115-125
ISSN:
0926-6690
Subject:
2,4-D; Artemisia annua; DNA; abscisic acid; aldehyde dehydrogenase; amino acid sequences; artemisinin; biochemical pathways; biosynthesis; chemical bonding; cold; cytochrome P-450; dimerization; gene overexpression; genes; heat; jasmonic acid; leaves; messenger RNA; methyl jasmonate; paraquat; roots; tissues; transcription (genetics); transcription factors; transgenic plants; trichomes
Abstract:
... Artemisinin based combination therapies are still an extensively used remedy for the cure of Malaria. Although artemisinin biosynthetic pathway has been fully worked out, only few information is available on its regulatory mechanism in plants. In the present study, a new member of MYC type basic helix loop helix transcription factor was isolated from Artemisia annua and named as, AaMYC2-Like. The ...
DOI:
10.1016/j.indcrop.2018.10.083

11. Electronic and optical properties of chromophores from hexeneuronic acids

Author:
Kumar, Amit,   et al.   ; Cappellini, Giancarlo; Delogu, Francesco;     Show all 3 Authors
Source:
Cellulose 2019 v.26 no.3 pp. 1489-1501
ISSN:
0969-0239
Subject:
acids; bleaching; cellulose; chemical structure; density functional theory; hydrogen peroxide; ionization; optical properties; solvents; spectral analysis
Abstract:
... We report a systematic computational investigation on the electronic and optical properties of chromophores derived from hexeneuronic acids (HexA). In particular, we focus on five chemical structures, which account up to 90% of HexaA-derived chromophores. We performed all-electrons density functional theory (DFT) and time dependent DFT (TDDFT) calculations with a localized Gaussian basis set and t ...
DOI:
10.1007/s10570-018-2174-8

12. Long-term prediction of greenhouse gas risk to the Chinese hydropower reservoirs

Author:
Kumar, Amit,   et al.   ; Yang, Tao; Sharma, M.P.;     Show all 3 Authors
Source:
The Science of the total environment 2019 v.646 pp. 300-308
ISSN:
0048-9697
Subject:
carbon; carbon dioxide; climate; electricity generation; greenhouse gas emissions; greenhouse gases; methane; methane production; models; prediction; risk; risk assessment; sustainable development; water power; China
Abstract:
... China is undergoing an extensive hydropower development, but the magnitude of greenhouse gas (GHG) emissions risk to reservoirs is not well known. Electricity generation from hydropower is a challenging issue when it comes to sustainable development. In this study, the data on Chinese hydropower reservoirs (n = 12) were collected from the literature and is used as in input to Greenhouse Gas Risk A ...
DOI:
10.1016/j.scitotenv.2018.07.314

13. A Techno-Economic Assessment of Renewable Diesel and Gasoline Production from Aspen Hardwood

Author:
Kumar, Amit,   et al.   ; Patel, Madhumita; Oyedun, Adetoyese Olajire; Gupta, Rajender;     Show all 4 Authors
Source:
Waste and biomass valorization 2019 v.10 no.10 pp. 2745-2760
ISSN:
1877-2641
Subject:
biofuels; biomass; fuel production; gasoline; hardwood; hydrogen; models; production costs; pyrolysis; uncertainty analysis; wood chips
Abstract:
... In this study, we developed a techno-economic model to estimate the production cost of renewable diesel and gasoline from aspen woodchips through fast pyrolysis-based bio-oil and its subsequent hydroprocessing. The whole pathway includes the conversion of woodchip biomass to bio-oil through fast pyrolysis followed by upgrading to transportation fuels via hydroprocessing. Experiments were carried o ...
DOI:
10.1007/s12649-018-0359-x

14. The development of a cost model for two supply chain network scenarios for decentralized pyrolysis system scenarios to produce bio-oil

Author:
Kumar, Amit,   et al.   ; Patel, Madhumita; Oyedun, Adetoyese Olajire; Doucette, John;     Show all 4 Authors
Source:
Biomass and bioenergy 2019 v.128 pp. 105287
ISSN:
0961-9534
Subject:
biofuels; biomass; forests; models; production costs; pyrolysis; supply chain
Abstract:
... Bio-oil, produced through fast pyrolysis, can act as an intermediate, which can be further upgraded to biofuels. Fast pyrolysis is done in either a centralized or a decentralized (mobile pyrolysis system [MPS]) system. In a centralized system, biomass is transported to a plant to produce bio-oil, which is upgraded in the same unit, while in a decentralized system, the mobile plant is moved to the ...
DOI:
10.1016/j.biombioe.2019.105287

15. What is the production cost of renewable diesel from woody biomass and agricultural residue based on experimentation? A comparative assessment

Author:
Kumar, Amit,   et al.   ; Patel, Madhumita; Oyedun, Adetoyese Olajire; Gupta, Rajender;     Show all 4 Authors
Source:
Fuel processing technology 2019 v.191 pp. 79-92
ISSN:
0378-3820
Subject:
Picea; agricultural wastes; biochar; biofuels; biomass; byproducts; corn stover; energy content; feedstocks; fossil fuels; gasoline; hydrogen; hydrogen production; income; market prices; models; particle size distribution; pyrolysis; temperature; transportation; wheat straw
Abstract:
... This study explores the technical and economic potential of three Canadian biomass feedstocks (spruce, corn stover and wheat straw) to replace petro-diesel through the production of renewable diesel and gasoline via fast pyrolysis and hydroprocessing. A detailed data-intensive process and cost model for a 2000 dry t d−1 plant capacity for two scenarios (hydrogen production and hydrogen purchase) w ...
DOI:
10.1016/j.fuproc.2019.03.026

16. Reactive oxygen species-mediated signaling during abiotic stress

Author:
Kumar, Amit,   et al.   ; Singh, Archana; Yadav, Sunita; Singh, Indrakant Kumar;     Show all 4 Authors
Source:
Plant gene 2019 v.18 pp. 100173
ISSN:
2352-4073
Subject:
abiotic stress; epigenetics; gene expression regulation; genes; mitogen-activated protein kinase; monitoring; organelles; oxidation; oxidative stress; oxygen; photosynthesis; post-translational modification; regulatory sequences; signal transduction; transcription (genetics); transcription factors
Abstract:
... Abiotic stress causes alterations in physiological, biochemical and metabolic equilibrium in the plant cells, leading to reduction in protein turn-over, change in post translational modification of proteins, impaired photosynthetic capability and increase in ROS production. The stress-induced ROS at higher levels can trigger oxidation of biomolecules, decomposition of membranes, inactivation of en ...
DOI:
10.1016/j.plgene.2019.100173

17. Iron-oxide nanoparticles target intracellular HSP90 to induce tumor radio-sensitization

Author:
Kumar, Amit,   et al.   ; Shetake, Neena G.; Pandey, Badri N.;     Show all 3 Authors
Source:
Biochimica et biophysica acta 2019 v.1863 no.5 pp. 857-869
ISSN:
0304-4165
Subject:
DNA damage; apoptosis; cell cycle checkpoints; cell proliferation; cyclins; drug therapy; fever; fibrosarcoma; gamma radiation; growth models; humans; iron oxides; magnetism; mice; mitosis; nanoparticles; tumor suppressor proteins
Abstract:
... Nanoparticle-based therapies have emerged as a promising approach to overcome limitations of conventional chemotherapy. Present study investigates the potential of oleic acid-functionalized iron-oxide nanoparticles (MN-OA) to enhance the radiation response of fibrosarcoma tumor and elucidates its underlying mechanism.Various cellular and molecular assays (e.g. MTT, clonogenic, cell cycle analysis, ...
DOI:
10.1016/j.bbagen.2019.02.010

18. A dimanganese(iii) porphyrin dication diradical and its transformation to a μ-hydroxo porphyrin–oxophlorin heterodimer

Author:
Kumar, Amit,   et al.   ; Sil, Debangsu; Usman, Mohammad; Rath, Sankar Prasad;     Show all 4 Authors
Source:
Chemical communications 2019 v.55 no.11 pp. 1588-1591
ISSN:
1364-548X
Subject:
chemical bonding; chemical communication; chemical reactions; ethylene; ferrimagnetic materials; free radicals; iron; manganese; models; porphyrins
Abstract:
... We investigate here the effect of electronic communication between two Mn(iii) porphyrin π-cation radicals, connected covalently through an ethylene bridge, which exhibit significant electronic communication resulting in strong antiferromagnetic coupling predominantly between two porphyrin radical spins. This, however, is in sharp contrast to its diiron(iii) analog where the porphyrin π-cation rad ...
DOI:
10.1039/c8cc09366k

19. Hyperbolic Pressure–Temperature Phase Diagram of the Zinc-Finger Protein apoKti11 Detected by NMR Spectroscopy

Author:
Kumar, Amit,   et al.   ; Klamt, Andi; Nagarathinam, Kumar; Tanabe, Mikio; Balbach, Jochen;     Show all 5 Authors
Source:
TheJournal of physical chemistry 2019 v.123 no.4 pp. 792-801
ISSN:
1520-5207
Subject:
Gibbs free energy; ambient pressure; compressibility; crystal structure; disulfide bonds; entropy; heat; models; nuclear magnetic resonance spectroscopy; physical phases; population growth; proteins; temperature; thermal expansion
Abstract:
... For a comprehensive understanding of the thermodynamic state functions describing the stability of a protein, the influence of the intensive properties of temperature and pressure has to be known. With the zinc-finger-containing Kti11, we found a suitable protein for this purpose because folding and unfolding transitions occur at an experimentally accessible temperature (280–330 °K) and pressure ( ...
DOI:
10.1021/acs.jpcb.8b11019

20. Ethnobotanical Survey of Daksum Forest Range of Anantnag District, Jammu and Kashmir, India

Author:
Kumar, Amit,   et al.   ; Fayaz, Mufida; Jain, Ashok K.; Bhat, Musadiq Hussain;     Show all 4 Authors
Source:
Journal of herbs, spices & medicinal plants 2019 v.25 no.1 pp. 55-67
ISSN:
1540-3580
Subject:
Asteraceae; Rosaceae; ethnobotany; forests; fruits; indigenous knowledge; interviews; surveys; vegetables; India
Abstract:
... An ethnobotanical study was conducted in the Daksum Forest of Anantnag district of Jammu and Kashmir State of India to document the traditional knowledge of its population, using semi-structured interviews and group conversation with 52 informants. One hundred and eight plant species, with a predominance of Asteraceae and Rosaceae, along with their detailed uses were documented. About 51 of the sp ...
DOI:
10.1080/10496475.2018.1564950