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1. Atmospheric pressure chemical ionisation (APCI) and photoionisation (APPI) mass spectrometry for detection of unsaturated fatty acids: potential for rapid detection of adulteration of vegetable oils

Author:
Singh, Dileep Kumar,   et al.   ; Strashnov, Ilya; Gilmour, Jamie D.; Cannavan, Andrew; Chen, Gang; Dissanayake, Champa; Fernando, Biyagamage Ruchika; Kelly, Simon; Muhammad, Syahidah Akmal; Xu, Zhenzhen;     Show all 10 Authors
Source:
Analytical methods 2019 v.11 no.30 pp. 3819-3828
ISSN:
1759-9679
Subject:
Helianthus annuus; adulterated products; atmospheric pressure; calibration; gas chromatography; ionization; mass spectrometry; olives; rapeseed; rapeseed oil; rapid methods; screening; statistics; unsaturated fatty acids; vegetable oil; India; Sri Lanka
Abstract:
... Adulteration of vegetable oils to maximize profit is a worldwide problem. Atmospheric pressure chemical ionisation (APCI) and photoionisation (APPI) mass spectrometry methods were developed to detect the relative abundances of unsaturated fatty acids (FAs) present in vegetable oils with the objective of high throughput and rapid identification of adulteration. The ionisation efficiencies of both m ...
DOI:
10.1039/c9ay00977a

2. One-Pot, Three-Component Approach to Diarylmethylphosphonates: A Direct Entry to Polycyclic Aromatic Systems

Author:
Singh, Dileep Kumar,   et al.   ; Prasad, Sure Siva; Kim, Ikyon;     Show all 3 Authors
Source:
Journal of organic chemistry 2019 v.84 no.10 pp. 6323-6336
ISSN:
1520-6904
Subject:
aldehydes; aromatic hydrocarbons; chemical reactions; chemical structure; organic chemistry
Abstract:
... A new type of three-component reaction was developed consisting of aldehydes, electron-rich (hetero)arenes, and trialkyl phosphite, which provided facile access to a wide range of diarylmethylphosphonates under mild reaction conditions. Simple one- or two-step synthetic manipulation of the resulting compounds enabled us to reach several polycyclic (hetero)aromatic systems efficiently. ...
DOI:
10.1021/acs.joc.9b00668

3. Antibiotics bioremediation: Perspectives on its ecotoxicity and resistance

Author:
Singh, Dileep Kumar,   et al.   ; Kumar, Mohit; Jaiswal, Shweta; Sodhi, Kushneet Kaur; Shree, Pallee; Agrawal, Pawan Kumar; Shukla, Pratyoosh;     Show all 7 Authors
Source:
Environment international 2019 v.124 pp. 448-461
ISSN:
0160-4120
Subject:
World Health Organization; animal husbandry; antibiotic resistance; antibiotics; bacterial infections; bioremediation; developing countries; ecotoxicology; hospitals; humans; issues and policy; longevity; medicine; people; pollution; resistance mechanisms; risk; therapeutics
Abstract:
... Antibiotic is one of the most significant discoveries and have brought a revolution in the field of medicine for human therapy. In addition to the medical uses, antibiotics have broad applications in agriculture and animal husbandry. In developing nations, antibiotics use have helped to increase the life expectancy by lowering the deaths due to bacterial infections, but the risks associated with a ...
DOI:
10.1016/j.envint.2018.12.065

4. Convergent synthesis of diptoindonesin G

Author:
Singh, Dileep Kumar,   et al.   ; Kim, Ikyon;     Show all 2 Author
Source:
Tetrahedron letters 2019 v.60 no.3 pp. 300-301
ISSN:
0040-4039
Subject:
Suzuki reaction; acylation; chemical structure; organic compounds
Abstract:
... A convergent and scalable synthetic route to a tetracyclic oligostilbenoid natural product, diptoindonesin G, is described where Suzuki-Miyaura cross-coupling and intramolecular Friedel-Crafts acylation were employed to construct the central C ring of diptoindonesin G. Two fragments for cross-coupling reaction were readily synthesized with similar efficiency. ...
DOI:
10.1016/j.tetlet.2018.12.036

5. Cold survival strategies for bacteria, recent advancement and potential industrial applications

Author:
Singh, Dileep Kumar,   et al.   ; Dhaulaniya, Amit S.; Balan, Biji; kumar, Mohit; Agrawal, Pawan K.;     Show all 5 Authors
Source:
Archives of microbiology 2019 v.201 no.1 pp. 1-16
ISSN:
0302-8933
Subject:
alkalinity; anthropogenic activities; bacteria; biogeochemical cycles; cold; cold zones; environmental factors; enzymes; industrial applications; salinity; temperature
Abstract:
... Microorganisms have evolved themselves to thrive under various extreme environmental conditions such as extremely high or low temperature, alkalinity, and salinity. These microorganisms adapted several metabolic processes to survive and reproduce efficiently under such extreme environments. As the major proportion of earth is covered with the cold environment and is exploited by human beings, thes ...
DOI:
10.1007/s00203-018-1602-3

6. Assessment of atrazine decontamination by epiphytic root bacteria isolated from emergent hydrophytes

Author:
Singh, Dileep Kumar,   et al.   ; James, Anina;     Show all 2 Author
Source:
Annals of microbiology 2018 v.68 no.12 pp. 953-962
ISSN:
1590-4261
Subject:
Acorus calamus; Arthrobacter; Phragmites; Pseudomonas; Typha latifolia; aquatic plants; atrazine; bacteria; biomass; bioreactors; decontamination; environmental factors; epiphytes; liquids; mutualism; pH; remediation; temperature; water treatment
Abstract:
... Aim of the study was to identify atrazine remediating bacteria that can potentially succeed in situ where they encounter varied environmental conditions. Three epiphytic root bacteria, genus Pseudomonas and Arthrobacter, were isolated from rhizoplanes of hydrophytes Acorus calamus, Typha latifolia, and Phragmites karka. Potential of these strains to decontaminate environmentally relevant concentra ...
DOI:
10.1007/s13213-018-1404-5

7. Skeletal Reorganization: Synthesis of Diptoindonesin G from Pauciflorol F

Author:
Singh, Dileep Kumar,   et al.   ; Kim, Ikyon;     Show all 2 Author
Source:
Journal of organic chemistry 2018 v.83 no.3 pp. 1667-1672
ISSN:
1520-6904
Subject:
chemical reactions; chemical structure; indans; organic chemistry
Abstract:
... Described herein is a novel synthetic approach to diptoindonesin G, a highly potent anticancer oligostilbenoid natural product, from pauciflorol F pentamethyl ether through a skeletal reorganization strategy where oxidative cleavage of the indanone ring system of pauciflorol F and sequential cyclization of the key intermediate allowed direct access to the target skeleton. ...
DOI:
10.1021/acs.joc.7b03089

8. Polyaromatic heterocycles through intramolecular alkyne carbonyl metathesis: 5-Acylnaphtho[2,1-b]benzofurans

Author:
Singh, Dileep Kumar,   et al.   ; Nayak, Maloy; Kim, Ikyon;     Show all 3 Authors
Source:
Tetrahedron 2017
ISSN:
0040-4020
Subject:
alkynes; benzofurans; chemical reactions; chemical structure
Abstract:
... A modular approach to 5-acylated naphtho[2,1-b]benzofurans was developed where Sonogashira cross-coupling and intramolecular alkyne carbonyl metathesis were sequentially employed to build the aromatic benzene C ring of naphtho[2,1-b]benzofuran with an acyl group at the C5 position. ...
DOI:
10.1016/j.tet.2017.02.036

9. Inducible headkidney cytochrome P450 contributes to endosulfan immunotoxicity in walking catfish Clarias gariepinus

Author:
Singh, Dileep Kumar,   et al.   ; Kumari, Usha; Srivastava, Nidhi; Shelly, Asha; Khatri, Preeti; N., Sarat; Mazumder, Shibnath;     Show all 7 Authors
Source:
Aquatic toxicology 2016 v.179 pp. 44-54
ISSN:
0166-445X
Subject:
death; quantitative polymerase chain reaction; viability; messenger RNA; metabolism; long term effects; Clarias batrachus; leukocytes; Clarias gariepinus; cytochrome P-450; endosulfan sulfate; fish; biotransformation; immunotoxicity; lethal concentration 50; metabolites
Abstract:
... The effect of endosulfan metabolites on fish immune system is not well known. It is also not clear whether endosulfan accumulates in fish immune organs and undergoes metabolic biotransformation in situ. In the present study we investigated the role of headkidney (HK), an important fish immune organ on endosulfan metabolism and the long term effects of endosulfan metabolites on the fish immune syst ...
DOI:
10.1016/j.aquatox.2016.08.009

10. Comparative performance evaluation of multi-metal resistant fungal strains for simultaneous removal of multiple hazardous metals

Author:
Singh, Dileep Kumar,   et al.   ; Dey, Priyadarshini; Gola, Deepak; Mishra, Abhishek; Malik, Anushree; Patel, Neelam; Von Bergen, Martin; Jehmlich, Nico;     Show all 8 Authors
Source:
Journal of hazardous materials 2016
ISSN:
0304-3894
Subject:
Aspergillus fumigatus; Aspergillus terreus; Beauveria bassiana; Food and Agriculture Organization; Isaria fumosorosea; cadmium; chromium; copper; fungi; irrigation rates; lead; metal tolerance; nickel; root growth; zinc
Abstract:
... In the present study, five fungal strains viz., Aspergillus terreus AML02, Paecilomyces fumosoroseus 4099, Beauveria bassiana 4580, Aspergillus terreus PD-17, Aspergillus fumigatus PD-18, were screened for simultaneous multimetal removal. Highest metal tolerance index for each individual metal viz., Cd, Cr, Cu, Ni, Pb and Zn (500mg/L) was recorded for A.fumigatus for the metals (Cd, 0.72; Cu, 0.72 ...
DOI:
10.1016/j.jhazmat.2016.07.025

11. Pseudacidovorax austerolens sp. nov., a nifH bacterium isolated from Himalayan valley soil, India

Author:
Singh, Dileep Kumar,   et al.   ; Tyagi, Shivani;     Show all 2 Author
Source:
Annals of microbiology 2015 v.65 no.1 pp. 217-223
ISSN:
1590-4261
Subject:
Acidovorax; Xylophilus; bacteria; chemotaxonomy; fatty acid composition; fatty acids; new species; nucleic acid hybridization; nucleotide sequences; phylogeny; ribosomal RNA; sequence analysis; soil; India
Abstract:
... Gram-negative, rod-shaped bacterial strain ptl-2ᵀ, was isolated from soil of the Himalayan valley, India. The bacterial strain ptl-2ᵀhas been characterized using a polyphasic taxonomic approach including morphological characterization, fatty acid analysis, biochemical tests, 16S rRNA and nifH gene sequence analysis. 16S rRNA gene sequence analysis showed that the strain ptl-2ᵀbelonged to the genus ...
DOI:
10.1007/s13213-014-0852-9

12. Dynamics of soil diazotrophic community structure, diversity, and functioning during the cropping period of cotton (Gossypium hirsutum)

Author:
Singh, Dileep Kumar,   et al.   ; Rai, Sandhya; Annapurna, Kannepalli;     Show all 3 Authors
Source:
Journal of basic microbiology 2015 v.55 no.1 pp. 62-73
ISSN:
0233-111X
Subject:
Gossypium hirsutum; acetylene reduction; cluster analysis; community structure; cotton; developmental stages; ethylene production; gamma-Proteobacteria; nitrogenase; phylogeny; restriction fragment length polymorphism; soil
Abstract:
... The soil sampled at different growth stages along the cropping period of cotton were analyzed using various molecular tools: restriction fragment length polymorphism (RFLP), terminal restriction length polymorphism (T‐RFLP), and cloning‐sequencing. The cluster analysis of the diazotrophic community structure of early sampled soil (0, 15, and 30 days) was found to be more closely related to each ot ...
DOI:
10.1002/jobm.201300867

13. Azospirillum himalayense sp. nov., a nifH bacterium isolated from Himalayan valley soil, India

Author:
Singh, Dileep Kumar,   et al.   ; Tyagi, Shivani;     Show all 2 Author
Source:
Annals of microbiology 2014 v.64 no.1 pp. 259-266
ISSN:
1590-4261
Subject:
Azospirillum; bacteria; chemotaxonomy; fatty acids; genes; new species; nucleotide sequences; ribosomal RNA; sequence homology; soil; India
Abstract:
... Gram-negative, free-living bacterial strain ptl-3ᵀwas isolated from Himalayan valley soil, India. Polyphasic taxonomy was performed including morphological characterization, fatty acid analysis, biochemical tests, 16S rRNA and nifH gene sequence analyses. 16S rRNA gene sequence analysis showed that the strain ptl-3ᵀbelonged to the genus Azospirillum and was closely related to A. brasilense (98.7 % ...
DOI:
10.1007/s13213-013-0658-1

14. Biodegradation of Endosulfan in Broth Medium and in Soil Microcosm by Klebsiella sp. M3

Author:
Singh, Dileep Kumar,   et al.   ; Singh, Madhu;     Show all 2 Author
Source:
Bulletin of environmental contamination and toxicology 2014 v.92 no.2 pp. 237-242
ISSN:
0007-4861
Subject:
Klebsiella; bacteria; biodegradation; endosulfan; nucleotide sequences; pH; ribosomal DNA; soil; soil ecology
Abstract:
... Nine endosulfan degrading bacterial strains were isolated by soil enrichment with endosulfan. Bacterial strain M3 was the most efficient degrader. Endosulfan degradation was accompanied by a decrease in pH of the medium and an increase in chloride ion concentration. The bacterium was tested for its ability to degrade endosulfan at different concentrations in broth and soil. Maximum degradation occ ...
DOI:
10.1007/s00128-013-1168-3
PubMed:
24318214

15. Endosulfan induced alteration in bacterial protein profile and RNA yield of Klebsiella sp. M3, Achromobacter sp. M6, and Rhodococcus sp. M2

Author:
Singh, Dileep Kumar,   et al.   ; Singh, Madhu;     Show all 2 Author
Source:
Journal of hazardous materials 2014 v.265 pp. 233-241
ISSN:
0304-3894
Subject:
Achromobacter; Klebsiella; RNA; adverse effects; bacteria; bacterial proteins; dose response; endosulfan; genes; magnesium sulfate; outer membrane proteins; plasmids; polyacrylamide gel electrophoresis; polypeptides; porins; soil; sulfur
Abstract:
... Three bacterial strains identified as Klebsiella sp. M3, Achromobacter sp. M6 and Rhodococcus sp. M2 were isolated by soil enrichment with endosulfan followed by shake flask enrichment technique. They were efficiently degrading endosulfan in the NSM (non sulfur medium) broth. Degradation of endosulfan was faster with the cell free extract of bacterial cells grown in the sulfur deficient medium (NS ...
DOI:
10.1016/j.jhazmat.2013.11.061