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Rebeiro BM, Triambak S, Garrett PE, Ball GC, Brown BA, Menéndez J, Romeo B, Adsley P, Lenardo BG, Lindsay R, Bildstein V, Burbadge C, Coleman R, Diaz Varela A, Dubey R, Faestermann T, Hertenberger R, Kamil M, Leach KG, Natzke C, Nzobadila Ondze JC, Radich A, Rand E, Wirth HF. ^{138}Ba(d,α) Study of States in ^{136}Cs: Implications for New Physics Searches with Xenon Detectors. Phys Rev Lett 2023; 131:052501. [PMID: 37595245 DOI: 10.1103/physrevlett.131.052501] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Accepted: 07/07/2023] [Indexed: 08/20/2023]
Abstract
We used the ^{138}Ba(d,α) reaction to carry out an in-depth study of states in ^{136}Cs, up to around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved states below the first 1^{+} level, which are important in the context of solar neutrino and fermionic dark matter (FDM) detection in large-scale xenon-based experiments. We identify for the first time candidate metastable states in ^{136}Cs, which would allow a real-time detection of solar neutrino and FDM events in xenon detectors, with high background suppression. Our results are also compared with shell-model calculations performed with three Hamiltonians that were previously used to evaluate the nuclear matrix element (NME) for ^{136}Xe neutrinoless double beta decay. We find that one of these Hamiltonians, which also systematically underestimates the NME compared with the others, dramatically fails to describe the observed low-energy ^{136}Cs spectrum, while the other two show reasonably good agreement.
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Affiliation(s)
- B M Rebeiro
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada
| | - S Triambak
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - P E Garrett
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B A Brown
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - J Menéndez
- Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, 08028 Barcelona, Spain
| | - B Romeo
- Donostia International Physics Center, 20018 San Sebastián, Spain
| | - P Adsley
- Cyclotron Institute and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - B G Lenardo
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R Lindsay
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - V Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C Burbadge
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Coleman
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A Diaz Varela
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Dubey
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - T Faestermann
- Physik Department, Technische Universität München, D-85748 Garching, Germany
| | - R Hertenberger
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
| | - M Kamil
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - C Natzke
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - J C Nzobadila Ondze
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - A Radich
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - E Rand
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - H-F Wirth
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
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Kanoujia J, Dubey R, Debgharia S, Sisodia P, Mohanalakshmi S, Bhatt S, Parashar P, Kishore A. Mini-Review on Analytical Methods Applied for Analysis and Characterization of Sericin. CURR ANAL CHEM 2022. [DOI: 10.2174/1573411019666221024150235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
Sericin is a serine-rich polydispersed glycoprotein found in Bombyx mori's cocoons. Sericin is extracted from cocoons as a protein, composed of amino acids like aspartic acid, glycine, tyrosine, serine, and glutamic acid with carboxyl, hydroxyl, and an amino group. Sericin has been explored for various pharmacological activities such as antioxidant, anti-inflammatory, antiapoptotic, antiproliferative, antibacterial, anti-hypercholesteremia, and wound healing activity. Moreover, sericin has also been explored as a biopolymer for the preparation of nanoparticles, scaffolds, hydrogels, films, etc. This mini-review illustrates the reported methods for the characterization of extracted sericin and quantification in pharmaceutical formulations. The review covers analytical methods like UV-Visible Spectroscopy, Fourier-transform infrared spectroscopy, amino acid analysis, mass spectroscopy, and high-performance liquid chromatography with a brief explanation of every analytical method.
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Affiliation(s)
- Jovita Kanoujia
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - Rudrakshi Dubey
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - Sumana Debgharia
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - Priyanjali Sisodia
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - S. Mohanalakshmi
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - Shvetank Bhatt
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
| | - Poonam Parashar
- Amity Institute of Pharmacy, Amity University Uttar Pradesh, Lucknow Campus, Lucknow, Uttar Pradesh, India
| | - Ankita Kishore
- Amity Institute of Pharmacy, Amity University Madhya Pradesh, Gwalior, Madhya Pradesh, India, 474005
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Jhingan A, Saneesh N, Kumar M, Mahajan R, Thakur M, Kaur G, Kapoor K, Kumar N, Shareef M, Dubey R, Appannababu S, Prasad E, Singh H, Golda KS, Ahuja R, Behera BR, Sugathan P. Development of a time of flight spectrometer based on position sensitive multi-wire proportional counters for fission fragment mass distribution studies. Rev Sci Instrum 2021; 92:033309. [PMID: 33820015 DOI: 10.1063/5.0029603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 03/05/2021] [Indexed: 06/12/2023]
Abstract
Characteristics and performance of a time of flight (TOF) spectrometer developed for performing fission mass distribution studies are presented. The spectrometer contains two TOF arms based on multi-wire proportional counters (MWPCs). Each arm has two MWPCs to form a start-stop detection system for TOF measurements. The start detector has an active area of 4 × 4 cm2. The stop detector is a two-dimensional position sensitive MWPC with an active area of 16 × 11 cm2. Salient features of the MWPCs are the use of reduced sub-millimeter wire pitches of 0.635 and 0.317 mm in the electrodes along with the use of gold plated tungsten wires of diameters 10 and 20 µm. A delay line for position electrodes is prepared using chip inductors and capacitors. Ten different configurations of MWPC were investigated for the start detector, which involved the use of three and four electrode geometries, use of different wire pitches, and use of aluminized mylar for timing electrodes. Performance results close to micro-channel plate detectors have been observed with some designs of MWPC, displaying rise times better than 2 ns with an estimated inherent time resolution of ∼100 ps FWHM. A position resolution of ∼1 mm (FWHM) has been observed. Design features of the MWPCs and their test performance results are described in this article.
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Affiliation(s)
- Akhil Jhingan
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - N Saneesh
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - M Kumar
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - Ruchi Mahajan
- Department of Physics, Panjab University, Chandigarh 160014, India
| | - Meenu Thakur
- Department of Physics, Panjab University, Chandigarh 160014, India
| | - Gurpreet Kaur
- Department of Physics, Panjab University, Chandigarh 160014, India
| | - K Kapoor
- Department of Physics, Panjab University, Chandigarh 160014, India
| | - Neeraj Kumar
- Department of Physical and Astrophysics, Delhi University, Delhi 110007, India
| | - M Shareef
- Department of Physics, School of Physical Sciences, Central University of Kerala, Kasaragod 671316, India
| | - R Dubey
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - S Appannababu
- Department of Nuclear Physics, Andhra University, Visakhapatnam 530003, India
| | - E Prasad
- Department of Physics, School of Physical Sciences, Central University of Kerala, Kasaragod 671316, India
| | - Hardev Singh
- Department of Physics, Kurukshetra University, Kurukshetra 136119, India
| | - K S Golda
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - R Ahuja
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
| | - B R Behera
- Department of Physics, Panjab University, Chandigarh 160014, India
| | - P Sugathan
- Inter University Accelerator Centre, P.O. Box 10502, New Delhi 110067, India
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Dubey R, Yadav A, Pawar A, Biswas A. Comparing the outcome of progenitor (CD34+) Cell dose calculated using ideal body weight to actual body weight on engraftment of neutrophils and platelets after PBSC transplant. Cytotherapy 2020. [DOI: 10.1016/j.jcyt.2020.03.082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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5
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Ramrakhiani N, Jain N, Dubey R, Sharma A, Kurapati S. Vasculitis and connective tissue disorders-study from Western India-A neurology perspective. J Neurol Sci 2019. [DOI: 10.1016/j.jns.2019.10.1118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Singh L, Dubey R, Singh S, Goel R, Nair S, Singh PK. Measuring quality of antenatal care: a secondary analysis of national survey data from India. BJOG 2019; 126 Suppl 4:7-13. [DOI: 10.1111/1471-0528.15825] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/15/2019] [Indexed: 11/27/2022]
Affiliation(s)
- L Singh
- ICMR – National Institute of Medical StatisticsNew Delhi India
| | - R Dubey
- ICMR – National Institute of Medical StatisticsNew Delhi India
| | - S Singh
- Division of Reproductive Biology, Maternal and Child Health Indian Council of Medical Research (ICMR) New Delhi India
| | - R Goel
- Division of Reproductive Biology, Maternal and Child Health Indian Council of Medical Research (ICMR) New Delhi India
| | - S Nair
- ICMR – National Institute of Medical StatisticsNew Delhi India
| | - PK Singh
- Division of Preventive Oncology, ICMR – National Institute of Cancer Prevention and ResearchNoida India
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Dubey R, Asthana B, Kushwaha N, Pawar A, Biswas A, Yadav A, Marik A. A Novel approach for rbc depletion in abo incompatible allogenic peripheral blood stem cell transplant using modified hydroxyethyl starch method. Cytotherapy 2019. [DOI: 10.1016/j.jcyt.2019.03.439] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Mok C, Dubey R, Adam E, MacLeod J. Divergent pathways of interzone and anlagen cell chondrogenesis during equine skeletal development. J Equine Vet Sci 2019. [DOI: 10.1016/j.jevs.2019.03.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kukreti K, Pandey L, Das M, Rastogi A, Dubey R, Sharma P. Prevalence of Canine Monocytic Ehrlichiosis in Canine Population Across India. Arch Razi Inst 2018; 73:87-93. [PMID: 30242799 DOI: 10.22092/ari.2018.116616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 05/31/2017] [Indexed: 09/30/2022]
Abstract
Canine ehrlichiosis is a very important emerging disease in India. This study is the first attempt screening a large number of canines in India for the detection of canine monocytic ehrlichiosis. In the present study, 510 blood samples of dogs were screened for the presence of Ehrlichia canis and other variants of Anaplasmataceae family by serological and molecular methods.Out of the 510 serum samples, 293 (57.5%) cases were found positive for the presence of E. canis antibodies through enzyme-linked immunosorbent assay (ELISA). Furthermore, and 45 (8.8%) and 1 (0.2%) specimens were positive for E. canis and A. platys, respectively, based on the polymerase chain reaction (PCR). In the clinical samples of E. canis, the minimum detection limit for PCR was9 ng. In the immunofluorescence assay (IFA), the positive blood samples showed comparable results with those obtained from the commercially available dot ELISA kit (giving equivalent IFA titer). The results of sequencing were compared with other reported isolates in various regions of the world, and a phylogenetic relationship was established. The 16S rRNA region that was amplified and sequenced for E. canis and A. platys was highly conserved and so was another Vir B9 region.
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Affiliation(s)
- K Kukreti
- Biotechnology Section, Central Military Veterinary Laboratory, remount Veterinary Corps, Meerut Cantt, Uttar Pradesh
| | - L Pandey
- St. Aloysius College, Jabalpur (MP), India.,St. Aloysius College, Jabalpur (MP), India
| | - M Das
- Biotechnology Section, Central Military Veterinary Laboratory, remount Veterinary Corps, Meerut Cantt, Uttar Pradesh, 250001, India
| | - A Rastogi
- Biotechnology Section, Central Military Veterinary Laboratory, remount Veterinary Corps, Meerut Cantt, Uttar Pradesh, 250001, India
| | - R Dubey
- Biotechnology Section, Central Military Veterinary Laboratory, remount Veterinary Corps, Meerut Cantt, Uttar Pradesh, 250001, India
| | - P Sharma
- Biotechnology Section, Central Military Veterinary Laboratory, remount Veterinary Corps, Meerut Cantt, Uttar Pradesh, 250001, India
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Tewari V, Somvanshi R, Trivedi R, Hussain M, Das Gupta H, Dubey R. Pure tethered cervical cord and review of literature. Asian J Neurosurg 2018; 13:72-74. [PMID: 29492126 PMCID: PMC5820900 DOI: 10.4103/1793-5482.224834] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Tethering of the spinal cord in the lumbosacral region with myelomeningocele is a well-known phenomenon. Only sporadic cases of tethering along the rest of the neuraxis, including the hindbrain, cervical, and thoracic spinal cord have been documented, always along with some associated congenital malformations (hydrocephalus, Chiari malformation, myelomeningocele, meningocele, hamartomatous stalk, spina bifida occulta, intramedullary lipoma, intradural fibrous adhesions, the fusion of the sixth and seventh cervical vertebrae, split cord malformation, or low-lying cord). In this report, 14-year-old male developed symptoms related to tethering of the cervical spinal cord, but without any associated congenital malformations, that is the pure tethered cervical cord. This causes his moribund status and makes the manuscript unique and contributes to the hitherto literature. The authors discuss the diagnosis, treatment, and postoperative course of this entity. The uniqueness in treatment is that we have operated the case without the help of intraoperative somatosensory evoked potentials and motor evoked potential from posterolateral approach under local anesthesia.
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Affiliation(s)
- Vinod Tewari
- Consultant Neurosurgeon, Mayo Hospital, Vikas Khand I, Lucknow, Uttar Pradesh
| | - Rituj Somvanshi
- Consultant Anasthetist, Mayo Hospital, Vikas Khand I, Lucknow, Uttar Pradesh
| | - Ravindra Trivedi
- Consultant Radiologist, MVT Diagnostics, Indiranagar, Lucknow, Uttar Pradesh
| | - Mazhar Hussain
- Director And Neurosurgeon, Sahara Hospital, Lucknow, Uttar Pradesh
| | - H Das Gupta
- Consultant Urologist, Neuro Center, PSS Complex, Vishal Khand III, Gomti Nagar, Lucknow, Uttar Pradesh
| | - R Dubey
- Director, General Surgeon, Samarpan Hospital, Lucknow, Uttar Pradesh
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Vosoughi Lahijani B, Badri Ghavifekr H, Dubey R, Kim MS, Vartiainen I, Roussey M, Herzig HP. Experimental demonstration of critical coupling of whispering gallery mode cavities on a Bloch surface wave platform. Opt Lett 2017; 42:5137-5140. [PMID: 29240156 DOI: 10.1364/ol.42.005137] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
We experimentally demonstrate critical coupling of whispering gallery mode (WGM) disk resonators implemented on a Bloch surface wave platform using scanning near-field optical microscopy. The studied structure is a 60 nm thick TiO2 WGM disk cavity (radius of 100 μm) operating within the C-band telecommunication wavelength. An extinction ratio of 26 dB and a quality factor of 2200 are measured. Such a high extinction ratio verifies the critical coupling of the WGM resonator. This result paves the way to planar optical signal processing devices based on the proposed geometry, for which a critical coupling condition is a guarantee of optimum performance.
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Nigam R, Dubey R, Saraswat R, Sundaresh, Gaur AS, Loveson VJ. Ancient Indians (Harappan Settlement) were Aware of Tsunami/Storm Protection Measures:A New Interpretation of Thick Walls at Dholavira, Gujarat, India. CURR SCI INDIA 2016. [DOI: 10.18520/cs/v111/i12/2040-2043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Dubey R, Vosoughi Lahijani B, Barakat E, Häyrinen M, Roussey M, Kuittinen M, Herzig HP. Near-field characterization of a Bloch-surface-wave-based 2D disk resonator. Opt Lett 2016; 41:4867-4870. [PMID: 27805637 DOI: 10.1364/ol.41.004867] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We present, to the best of our knowledge, the first experimental investigation of a two-dimensional disk resonator on a dielectric multilayer platform sustaining Bloch surface waves. The disk resonator has been patterned into a few tens of nanometer thin (∼λ/25) titanium dioxide layer deposited on the top of the platform. We characterize the disk resonator by multi-heterodyne scanning near-field optical microscopy. The low loss characteristics of Bloch surface waves allowed us to reach a measured quality factor of 2×103 for a disk radius of 100 μm.
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Kaur G, Behera B, Jhingan A, Nayak B, Dubey R, Sharma P, Thakur M, Mahajan R, Saneesh N, Banerjee T, Khushboo, Kumar A, Mandal S, Saxena A, Sugathan P, Rowley N. Barrier distribution from 28Si+ 154Sm quasielastic scattering: Coupling effects in the fusion process. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Dubey R, Sugathan P, Jhingan A, Kaur G, Mukul I, Siwal D, Saneesh N, Banerjee T, Yadav A, Thakur M, Mahajan R, Chaterjee M. Study of fusion-fission dynamics in 19F+ 238U reaction. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Adhikari S, Basu C, Sugathan P, Jhingan A, Behera BR, Saneesh N, Kaur G, Thakur M, Mahajan R, Dubey R, Mitra AK. The study of 12C(α,γ) astrophysical reaction using 12C( 6Li,d) and 12C( 7Li,t) reaction at 20 MeV and in the framework of the potential model. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158600001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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17
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Mukul I, Sugathan P, Gehlot J, Mohanto G, Rhine Kumar AK, Mazumdar I, Kaur M, Madhavan N, Nath S, Dubey R, Banerjee T, Saneesh N, Gothe DA, Arumugam P, Roy A. Spin gated GDR widths at moderate temperatures. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158600029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Dixit S, Dubey R, Bhushan R. High-performance liquid chromatography for analytical and small-scale preparative separation of (R,S)-mexiletine using (S)-(—)-(N)-trifluoroacetyl-prolyl chloride and (1S)-(—)-camphanic chloride and recovery of native enantiomer by detagging. ACTA CHROMATOGR 2014. [DOI: 10.1556/achrom.26.2014.4.5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Dubey R, Soon CS, Hsieh PJ. A blurring based model of peripheral vision predicts visual search performances. J Vis 2014. [DOI: 10.1167/14.10.935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dubey R, Martini LG, Christie M. Duel-acting subcutaneous microemulsion formulation for improved migraine treatment with zolmitriptan and diclofenac: formulation and in vitro-in vivo characterization. AAPS J 2013; 16:214-20. [PMID: 24363199 DOI: 10.1208/s12248-013-9557-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 12/09/2013] [Indexed: 11/30/2022]
Abstract
Subcutaneous triptan provides immediate analgesia in migraine and cluster headache but is limited by high pain recurrence due to rapid drug elimination. A dual-acting subcutaneous formulation providing immediate release of a triptan and slow but sustained release of a nonsteroidal anti-inflammatory drug may provide a longer duration of relief. A microemulsion-based technology has various advantages over other technically complex dosage forms. Oil-in-water microemulsions of zolmitriptan and diclofenac acid using Labrafac Lipophile, Tween 80, Capryol 90 and water were prepared. One formulation was characterised in vitro and found to have uniformly dispersed nanosized globules. The formulation provided differential release of zolmitriptan and diclofenac acid both in vitro as well as in vivo that may be potentially beneficial to migraine patients.
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Affiliation(s)
- R Dubey
- King's College London, Waterloo Campus, 150 Stamford Street, SE1 9NH, London, UK,
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22
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Mukul I, Sugathan P, Mazumdar I, Gehlot J, Mohanto G, Kaur M, Rhine Kumar AK, Madhavan N, Nath S, Dubey R, Gothe DA, Arumugam P, Roy A. Giant Dipole Resonance in A ~ 144 mass region. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136301020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Stegemann S, Kopp S, Borchard G, Shah V, Senel S, Dubey R, Urbanetz N, Cittero M, Schoubben A, Hippchen C, Cade D, Fuglsang A, Morais J, Borgström L, Farshi F, Seyfang KH, Hermann R, van de Putte A, Klebovich I, Hincal A. Developing and advancing dry powder inhalation towards enhanced therapeutics. Eur J Pharm Sci 2013; 48:181-94. [DOI: 10.1016/j.ejps.2012.10.021] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2012] [Revised: 10/22/2012] [Accepted: 10/26/2012] [Indexed: 01/04/2023]
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Farelo F, Alqasemi R, Dubey R. Task-oriented control of a 9-DoF WMRA system for opening a spring-loaded door task. IEEE Int Conf Rehabil Robot 2012; 2011:5975484. [PMID: 22275682 DOI: 10.1109/icorr.2011.5975484] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
A 9-Dof wheelchair mounted robotic arm system (WMRA) has been developed to assist wheelchair-bound persons with upper limb motion limitations to perform activities of daily living (ADL) tasks. In this paper, we utilize mobile manipulation control to keep the end-effector stationary while moving the base and vice versa. This allows easier execution of a group of pre-set ADL tasks including opening and holding a spring loaded door passing through by locking the end-effector position and orientation. Redundancy resolution is achieved by optimizing the manipulability measure while the ADL task is being performed. Combined mobility and manipulation is expanded in this work to turn the USF WMRA into a task-oriented robotic system.
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Dubey R, Wang LW, Figueira EC, Amjadi S, Brown TM, Younan NM, Wilcsek G, Francis IC. Management of marginal chalazia: a surgical approach. Br J Ophthalmol 2009; 95:590,596-7. [PMID: 19661071 DOI: 10.1136/bjo.2008.146704] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- R Dubey
- Department of Ophthalmology, Prince of WalesHospital, Randwick, New South Wales, Australia
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Mishra N, Vilcek S, Rajukumar K, Dubey R, Tiwari A, Galav V, Pradhan HK. Identification of bovine viral diarrhea virus type 1 in yaks (Bos poephagus grunniens) in the Himalayan region. Res Vet Sci 2008; 84:507-10. [PMID: 17663013 DOI: 10.1016/j.rvsc.2007.05.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2007] [Accepted: 05/29/2007] [Indexed: 11/29/2022]
Abstract
Since cattle are widely infected by bovine viral diarrhea virus (BVDV) in India, we searched for pestivirus infection in yaks. Of 71 pure and crossbred yaks from Himalayan region, pestivirus antigen was detected by Ag-ELISA in three animals. Pestivirus in leukocyte and cell culture isolated virus samples originating from positive yaks was also confirmed by RT-PCR using panpestivirus specific primers selected from 5'-untranslated region (5' UTR). The 5' UTR, N(pro) and E2 regions were sequenced and used for genetic typing. Phylogenetic analysis revealed that pestiviruses detected in three Himalayan yaks were similar genetically, belonging to BVDV-1. Antigenic characterisation of yak pestivirus also confirmed the typing as BVDV-1. This is the first report on the identification of BVDV type 1 in yaks.
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Affiliation(s)
- N Mishra
- High Security Animal Disease Laboratory, Indian Veterinary Research Institute, Anand Nagar, Bhopal, Madhya Pradesh 462 021, India.
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Mishra N, Dubey R, Rajukumar K, Tosh C, Tiwari A, Pitale SS, Pradhan HK. Genetic and antigenic characterization of bovine viral diarrhea virus type 2 isolated from Indian goats (Capra hircus). Vet Microbiol 2007; 124:340-7. [PMID: 17509780 DOI: 10.1016/j.vetmic.2007.04.023] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2007] [Revised: 04/05/2007] [Accepted: 04/11/2007] [Indexed: 11/16/2022]
Abstract
Recent studies have shown that bovine viral diarrhea virus (BVDV) type 1 is widely prevalent in Indian cattle. In a surveillance of randomly collected 562 blood samples from seven states during 2004-2006, BVDV type 2 was detected in two native Indian goats by nested reverse transcription polymerase chain reaction (nRT-PCR). The virus isolated from them was classified antigenically as BVDV 2 on the basis of virus neutralization test and reactivity with monoclonal antibodies. Phylogenetic analysis of three different genomic regions, 5' un-translated region (5' UTR), E(rns) structural coding region and NS5B nonstructural coding region typed Indian goat isolate as BVDV 2a having close similarity with strains from North America and Europe suggesting its probable introduction through trade. It was placed in a separate clade within the 2a branch having unique mutations in E(rns) and NS5B region. This is the first report of BVDV 2 in India and only second time recorded in goat species. The isolation of BVDV 2 from goat warrants intensive surveillance in cattle and sheep.
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Affiliation(s)
- N Mishra
- High Security Animal Disease Laboratory, Indian Veterinary Research Institute, Anand Nagar, Bhopal, Madhya Pradesh 462021, India.
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Goyal R, Kumar G, Dubey R, Malakar PK. Management of Gastroschisis in a Peripheral Hospital. Med J Armed Forces India 2007; 63:392-3. [PMID: 27408063 DOI: 10.1016/s0377-1237(07)80035-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2006] [Accepted: 06/07/2007] [Indexed: 11/26/2022] Open
Affiliation(s)
- R Goyal
- Graded Specialist (Anaesthesia), Base Hospital, Delhi
| | - G Kumar
- Classified Specialist (Surgery), Army Hospital (R&R), Delhi
| | - R Dubey
- Classified Specialist (Anaesthesia), 178 Military Hospital, C/o 99 APO
| | - P K Malakar
- Classified Specialist (Surgery), 164 Military Hospital, C/o 99 APO
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Leeners B, Twiehaus A, Dubey R, Imthurn B. Einfluss von Östrogen, Östrogenmetaboliten und ICI 182780 (Fulvestrant) auf das Wachstum von Endometriosezellen. Geburtshilfe Frauenheilkd 2007. [DOI: 10.1055/s-2007-989167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Galav V, Mishra N, Dubey R, Rajukumar K, Pitale SS, Shrivastav AB, Pradhan HK. Pathogenicity of an Indian isolate of bovine viral diarrhea virus 1b in experimentally infected calves. Res Vet Sci 2007; 83:364-8. [PMID: 17383693 DOI: 10.1016/j.rvsc.2007.01.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2006] [Revised: 12/02/2006] [Accepted: 01/30/2007] [Indexed: 11/16/2022]
Abstract
The aim of this study was to determine the pathogenicity of an Indian bovine viral diarrhea virus (BVDV) 1b isolate in 7-9-months-old male calves. Infected (four) and control (two) calves were bled at three days interval for hematological, virological and serological studies until day 27. All infected calves developed respiratory illness, biphasic pyrexia, mild diarrhea, leucopenia and mild thrombocytopenia. Viraemia was demonstrated between 3 and 15dpi and the infected calves seroconverted by 15dpi. Prominent kidney lesions were endothelial cell swelling, proliferation of mesangial cells and podocytes leading to glomerular space obliteration. Degeneration and desquamation of cells lining seminiferous tubules were observed in two infected calves. Consolidation of lungs with interstitial pneumonia, mild gastroenteritis and systemic spread were also evident. It was concluded that Indian BVDV isolate induced moderate clinical disease in calves and glomerulonephritis resulting from acute BVDV infection was observed for the first time.
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Affiliation(s)
- V Galav
- High Security Animal Disease Laboratory (HSADL), Indian Veterinary Research Institute, Anand Nagar, Bhopal, Madhya Pradesh 462021, India
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Halve AK, Bhadauria D, Bhaskar B, Dubey R, Sharma V. Synthesis and In vitro efficacy of some halogenated imine derivatives as potential antimicrobial agents. Indian J Pharm Sci 2007. [DOI: 10.4103/0250-474x.38476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Halve AK, Dubey R, Bhadauria D, Bhaskar B, Bhadauria R. Synthesis, antimicrobial screening and structure-activity relationship of some novel 2-hydroxy-5-(nitro-substituted phenylazo) benzylidine anilines. Indian J Pharm Sci 2006. [DOI: 10.4103/0250-474x.27831] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Sharma C, Dubey R, Kumar H, Saha N. Food reduces the bioavailability of lamotrigine. Indian J Med Res 2005; 121:659-64. [PMID: 15937369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
BACKGROUND AND OBJECTIVE Lamotrigine is a relatively newer antiepileptic drug used in the treatment of partial seizures. It has a narrow therapeutic index and hence the achieved blood level of the drug is closely related to the therapeutic efficacy and toxicity. The bioavailability of lamotrigine is affected by food, hence the present study was done to investigate the effect of two types of food on the bioavailability of lamotrigine. METHODS A randomized, open-label, three treatment, three period, single dose and cross-over study was done in nine healthy male volunteers. A single dose of lamotrigine (100 mg) was administered at three occasions: after a north Indian diet (high calorie, high fat), after a south Indian diet (low calorie, low fat), and after an overnight fasting. Serial blood samples were collected up to 24 h post dose. Plasma lamotrigine concentrations were determined and pharmacokinetic parameters studied. RESULTS A statistically significant decrease in rate and extent of absorption was observed with north Indian diet and south Indian diet when compared with fasting group. Presence of both types of food causes decrease in mean values of C(max), AUC((0-t)), and AUC((0-alpha)) thus reducing the bioavailability of lamotrigine at significant level (P<0.05). INTERPRETATION AND CONCLUSION Lamotrigine should be taken preferably in fasting condition, as presence of food (low fat, low calorie or high fat, high calorie) decreases the bioavailability to a significant extent.
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Affiliation(s)
- C Sharma
- Department of Pharmaceutics, Delhi Institute of Pharmaceutical Sciences, New Delhi, India
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Irshad M, Dubey R. Apolipoproteins and their role in different clinical conditions: an overview. Indian J Biochem Biophys 2005; 42:73-80. [PMID: 23923565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Apolipoproteins or apoproteins are a group of proteins associated with lipoproteins in different proportions and play significant roles in several diseases. Different types of apolipoproteins, including apolipoproteins A, B, C, D, E, H and J and their subclasses have been reported, in addition to a few more apolipoproteins reported recently. These proteins have varied, but definite roles in normal physiology in our body. Moreover, their blood levels have strong association with clinical conditions during different diseases and are used as diagnostic and prognostic markers and to compute index of risk for some serious disease entities. Present article gives an overview of the structural features, physiological significance and diagnostic and clinical implications of apolipoproteins.
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Affiliation(s)
- M Irshad
- Clinical Biochemistry Division, Department of Laboratory Medicine, All India Institute of Medical Sciences, New Delhi 110 029, India.
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Verma SM, Arora H, Dubey R. Anti - inflammatory and sedative - hypnotic activity of the methanolic extract of the leaves of mentha arvensis. Anc Sci Life 2003; 23:95-9. [PMID: 22557118 PMCID: PMC3330963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2003] [Accepted: 07/16/2003] [Indexed: 11/05/2022] Open
Abstract
Mentha arvensis Linn, a plant used as traditional medicine and in perfumery, has now been explored for its pharmacological activities as an anti-inflammatory and also as sedativehypnotic plant drug. The methanolic extract of the leaves after being processed, was taken for the pharmacological study. Anti-inflammatory activity was carried out on albino rats. Further, the activity was compared to that of a standard anti-inflammatory drug - nimesulide and the percent inhibition of oedema determined. The sedative hypnotic activity, when carried out on mice, showed the potentiation of pentobarbitone induced sleeping time. The data of average recovery time was analyzed to show the standard deviation from the mean.
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Affiliation(s)
- S. M. Verma
- Department of Pharmaceutical Sciences, Birla Institute of Technology, Mesra, Ranchi – 835 215, India
| | - H. Arora
- Department of Pharmaceutical Sciences, Birla Institute of Technology, Mesra, Ranchi – 835 215, India
| | - R. Dubey
- Department of Pharmaceutical Sciences, Birla Institute of Technology, Mesra, Ranchi – 835 215, India
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Takeda M, Phillips JK, Dubey R, Polson JW, Lipski J. Modulation of ACh-induced currents in rat adrenal chromaffin cells by ligands of alpha2 adrenergic and imidazoline receptors. Auton Neurosci 2001; 88:151-9. [PMID: 11474556 DOI: 10.1016/s1566-0702(01)00221-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study was to investigate the expression of the alpha2-adrenergic receptors in the adrenal medulla, and to examine the mechanism by which clonidine and related drugs inhibit acetylcholine (ACh)-induced whole-cell currents in adrenal chromaffin cells. Reverse transcription-polymerase chain reaction (RT-PCR) performed on punches of rat adrenal medulla demonstrated expression of mRNA for the 2A-, alpha2B- and alpha2C-adrenergic receptors. Similar experiments conducted with tissue punches obtained from the adrenal cortex did not reveal expression of these receptor subtypes. Whole-cell currents were recorded in isolated chromaffin cells using the perforated-patch configuration. ACh (50 microM) evoked inward currents with a peak amplitude of 117.8+/-9.3 pA (n = 45; Vhol = -60 mV). The currents were inhibited in a dose-dependent manner (0.5-50 microM) by clonidine, UK 14,304 and rilmenidine (agonists of alpha2/imidazoline receptors), as well as by SKF 86466 and efaroxan (antagonists). Adrenaline and noradrenaline (50-100 microM) had no significant effect. Thus, although the adrenal medulla expresses mRNA for the alpha2-adrenergic receptors, the lack of agonist-antagonist specificity observed in our whole-cell recordings (in the absence of intracellular dialysis) provides additional evidence against the possibility that these inhibitory effects are mediated by classical alpha2 or imidazoline receptor interactions.
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Affiliation(s)
- M Takeda
- Department of Physiology, Faculty of Medicine and Health Science, University of Auckland, New Zealand
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Phillips JK, Goodchild AK, Dubey R, Sesiashvili E, Takeda M, Chalmers J, Pilowsky PM, Lipski J. Differential expression of catecholamine biosynthetic enzymes in the rat ventrolateral medulla. J Comp Neurol 2001; 432:20-34. [PMID: 11241375 DOI: 10.1002/cne.1086] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Adrenergic (C1) neurons located in the rostral ventrolateral medulla are considered a key component in the control of arterial blood pressure. Classically, C1 cells have been identified by their immunoreactivity for the catecholamine biosynthetic enzymes tyrosine hydroxylase (TH) and/or phenylethanolamine N-methyltransferase (PNMT). However, no studies have simultaneously demonstrated the expression of aromatic L-amino acid decarboxylase (AADC) and dopamine beta-hydroxylase (DBH) in these neurons. We examined the expression and colocalization of all four enzymes in the rat ventrolateral medulla using immunohistochemistry and reverse transcription-polymerase chain reaction (RT-PCR) analysis. Retrograde tracer injected into thoracic spinal segments T2-T4 was used to identify bulbospinal neurons. Using fluorescence and confocal microscopy, most cells of the C1 group were shown to be double or triple labeled with TH, DBH, and PNMT, whereas only 65-78% were immunoreactive for AADC. Cells that lacked detectable immunoreactivity for AADC were located in the rostral C1 region, and approximately 50% were spinally projecting. Some cells in this area lacked DBH immunoreactivity (6.5-8.3%) but were positive for TH and/or PNMT. Small numbers of cells were immunoreactive for only one of the four enzymes. Numerous fibres that were immunoreactive for DBH but not for TH or PNMT were noted in the rostral C1 region. Single-cell RT-PCR analysis conducted on spinally projecting C1 neurons indicated that only 76.5% of cells that contained mRNA for TH, DBH, and PNMT contained detectable message for AADC. These experiments suggest that a proportion of C1 cells may not express all of the enzymes necessary for adrenaline synthesis.
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Affiliation(s)
- J K Phillips
- Department of Physiology, University of Auckland, Auckland, New Zealand
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41
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Bansal AK, Khar RK, Dubey R, Sharma AK. Benzyl ester prodrug of ibuprofen: pharmacological and toxicological profile. Boll Chim Farm 2001; 140:79-82. [PMID: 11417391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Prodrug approach is a promising way of overcoming gastrotoxicity associated with long term oral use of NSAIDs like ibuprofen. The candidature of benzyl ester prodrug of ibuprofen was examined to assess its ability to reduce gastrotoxicity without affecting pharmacological response. It gave highly promising activity profile in established animal models like carrageenan induced rat paw oedema and acetic acid induced writhing reflex assay. The effect of physicochemical properties like aqueous solubility, octanol-water partition coefficient, hydrolysis kinetics in human plasma and simulated gastric fluid, on activity profile has been investigated.
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Bansal AK, Khar RK, Dubey R, Sharma AK. Alkyl ester prodrugs for improved topical delivery of ibuprofen. Indian J Exp Biol 2001; 39:280-3. [PMID: 11495290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Topical delivery of ibuprofen directly to the site of inflammation can overcome gastrointestinal side effects associated with its long term oral administration. The set of physicochemical properties necessary for optimum topical delivery of ibuprofen can be imparted by formation of its ester prodrugs. Various alkyl ester prodrugs (methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-buty, n-pentyl, hexyl, heptyl, octyl, lauryl, cetyl and octadecyl esters) were synthesised and studied for their physicochemical properties and activity in the carrageenan induced rat paw oedema by topical route. Favourable shift in lipophilicity and self penetration enhancing effect of prodrugs responded in improved topical activity over the parent drug ibuprofen.
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Affiliation(s)
- A K Bansal
- College of Pharmacy, Pushp Vihar, Sector 3, New Delhi, India
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Dubey R, Mi Z, Gillespie DG, Jackson EK. Dysregulation of extracellular adenosine levels by vascular smooth muscle cells from spontaneously hypertensive rats. Arterioscler Thromb Vasc Biol 2001; 21:249-54. [PMID: 11156861 DOI: 10.1161/01.atv.21.2.249] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
-The objective of this investigation was to determine whether the regulation of extracellular adenosine levels by smooth muscle cells (SMCs) from conduit arteries (aorta) and resistance microvessels (renal arterioles) is different in spontaneously hypertensive rats (SHR) versus normotensive Wistar-Kyoto (WKY) rats. Basal extracellular adenosine levels were decreased in cultured aortic and arteriolar SHR SMCs, and the increase in extracellular adenosine levels induced by stimulation of the cAMP-adenosine pathway was less in aortic and arteriolar SHR SMCs. Extracellular adenosine levels were lower in SHR SMCs, however, even when the cAMP-adenosine pathway was inhibited with 3-isobutyl-1-methylxanthine. Inhibition of adenosine kinase with iodotubercidin and inhibition of adenosine deaminase with erythro-9-(2-hydroxy-3-nonyl) adenine increased extracellular adenosine; however, only inhibition of adenosine deaminase equalized extracellular adenosine levels in SHR versus WKY SMCs. Membrane-disrupted SHR SMCs metabolized exogenous adenosine faster than WKY SMCs did, and this difference was abolished by inhibition of adenosine deaminase but not adenosine kinase. SHR SMCs demonstrated a greater proliferative response than WKY SMCs. This enhanced proliferative response was not blocked by adenosine per se or inhibition of adenosine kinase but was blocked by inhibition of adenosine deaminase and by 2-chloroadenosine (adenosine deaminase-resistant adenosine analogue). We conclude that dysregulation of extracellular adenosine levels exists in SHR SMCs, that this dysregulation is not due to a defect in the cAMP-adenosine pathway but rather to enhanced activity of adenosine deaminase, and that the dysregulation of extracellular adenosine mediates the enhanced proliferative response of SHR SMCs.
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Affiliation(s)
- R Dubey
- Departmentof Obstetrics and Gynecology, Clinic for Endocrinology, University Hospital Zurich, Zurich,Switzerland.
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Abstract
Glycolamide esters of ibuprofen (I), namely, unsubstituted (II), N,N dimethyl (III), and N,N diethyl (IV), were synthesized and studied for different physicochemical, pharmacological, and toxicological properties. They were comparable with I in respect of anti-inflammatory and analgesic activity but did not exhibit reduction in the ulcerogenicity on oral administration. However, all three exhibited significantly better topical activity in carrageenan-induced rat paw edema assay. In the same assay, they provided significant protection against inflammation when applied at a site remote to the inflammation site.
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Affiliation(s)
- A K Bansal
- College of Pharmacy, Pushp Vihar Sector 3, New Delhi 110 017, India
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Phillips JK, Dubey R, Sesiashvilvi E, Takeda M, Christie DL, Lipski J. Differential expression of the noradrenaline transporter in adrenergic chromaffin cells, ganglion cells and nerve fibres of the rat adrenal medulla. J Chem Neuroanat 2001; 21:95-104. [PMID: 11173223 DOI: 10.1016/s0891-0618(00)00113-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Expression of the noradrenaline transporter (NAT) was identified in various cell and fibre populations of the rat adrenal medulla, examined with immunohistochemistry and confocal microscopy. Immunoreactivity for the catecholamine biosynthetic enzymes tyrosine hydroxylase (TH), aromatic-L-amino-acid decarboxylase (AADC) and dopamine beta-hydroxylase (DBH) was present in all chromaffin cells, while phenylethanolamine N-methyltransferase (PNMT) was used to determine adrenergic chromaffin cell groups. Labelling with NAT antibody was predominantly cytoplasmic and colocalised with PNMT immunoreactivity. Noradrenergic chromaffin cells were not NAT immunoreactive. Additionally, NAT antibody labelling demonstrated clusters of ganglion cells (presumably Type I) and nerve fibres. Expression of TH, AADC, DBH, PNMT and NAT mRNA was examined using reverse transcription-polymerase chain reaction (RT-PCR) from adrenal medulla punches and single chromaffin cells, and results were consistent with those obtained with immunocytochemistry. Chromaffin cells and fibres labelled with antibodies against growth associated protein-43 (GAP-43) were not NAT immunoreactive, while ganglion cells were doubled labelled with the two antibodies. The presence of NAT in adrenergic chromaffin cells, and its absence from noradrenergic cells, suggests that the adrenergic cell type is primarily responsible for uptake of catecholamines in the adrenal medulla.
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Affiliation(s)
- J K Phillips
- Department of Physiology, School of Medicine, University of Auckland, Private Bag 92019, Auckland, New Zealand.
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Dubey R, Bavdekar SB, Muranjan M, Joshi A, Narayanan TS. Intestinal giardiasis: an unusual cause for hypoproteinemia. Indian J Gastroenterol 2000; 19:38-9. [PMID: 10659492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Malabsorption is a well-known complication of infection with Giardia lamblia. However, selective protein-losing enteropathy is rare. We report a child with anasarca due to hypoalbuminemia as a result of gastrointestinal protein loss. Investigations established giardiasis as the etiology. The child returned to normal health after treatment with metronidazole.
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Affiliation(s)
- R Dubey
- Department of Pediatrics, Seth G S Medical College, Mumbai
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Marwaha RK, Garg MK, Nijhavan VS, Dham DN, Dubey R, Amberdar V, Jain SK, Meharda NS. Prevalence of chronic lymphocytic thyroiditis in adolescent girls. J Assoc Physicians India 1998; 46:606-8. [PMID: 12152841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Chronic lymphocytic thyroiditis (CLT) is the most common cause of thyroid enlargement in children and adolescents in iodine sufficient areas. The prevalence and pattern of CLT in adolescent girls in iodine deficient regions supplemented with iodine is as yet not known. We therefore, carried out clinical examination for the presence of goitre in 330 healthy girls from Delhi in the age group of 16-20 years and those with goitre were further subjected to detailed biochemical (T3, T4, TSH), immunological (ATg ad ATm) and cytomorphological examination. The prevalence of goitre was found to be 40%. Fine needle aspiration cytology (FNAC) carried out in 94 girls with goitre (74%) revealed finding consistent with CLT in 13 (13.8%), colloid goitre with non-specific thyroiditis in 7 (7.4%), colloid goitre in 71 (75.5%) and specimen was inadequate in 3 (3.2%) girls. Thyroid antibodies were estimated in 114 of the goitrous subjects and both ATg and ATm were positive in 11 (9.6%) cases. Overall prevalence of CLT in this population was 4.0% and among those with goitre was 13.8%. When thyroid antibodies were also considered as an indicator of thyroiditis, prevalence rose to 14.4% among goitrous girls. Thyroid function tests were found to be within normal limits in all goitrous girls. This study for the first time reveals a high prevalence of CLT in goitrous adolescent girls from iodine supplemented region and underscores the need to study the prevalence of CLT in different age and sex groups from different regions of the country.
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Affiliation(s)
- R K Marwaha
- Department of Endocrinology, Institute of Nuclear Medicine and Allied Sciences, Timarpur, New Delhi
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48
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Dubey R. Simultaneous determination of lead and cadmium in various environmental and biological samples by differential pulse polarography after adsorption of their morpholine-4-carbodithioates onto microcrystalline naphthalene or morpholine-4-dithiocarbamate-CTMAB-naphthalene adsorbent. Talanta 1995; 42:65-72. [DOI: 10.1016/0039-9140(94)00217-g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/1994] [Revised: 07/25/1994] [Accepted: 07/26/1994] [Indexed: 10/27/2022]
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49
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Bansal AK, Khar RK, Dubey R, Sharma AK. Effect of group substitution on the physicochemical properties of ibuprofen prodrugs. Pharmazie 1994; 49:422-4. [PMID: 8047542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A series of alkyl ester prodrugs of ibuprofen was synthesized and studied for its physicochemical properties like aqueous solubility, octanol-water partition coefficient and hydrolysis kinetics in aqueous buffer and human plasma. These physicochemical parameters have a forebearing on the overall activity profile of these prodrugs. Mathematical relationships have been derived to characterize these properties.
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Affiliation(s)
- A K Bansal
- College of Pharmacy, Pushp Vihar, New Delhi, India
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50
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Dubey R, Jalili VP, Garg S. Oral hygiene and gingival status in orthodontic patients. J Pierre Fauchard Acad 1993; 7:43-54. [PMID: 9791270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
The study was conducted to find out the plaque deposition and changes in the gingiva in patients under going orthodontic treatment with Fixed appliances, active removable appliances and with myofunctional appliances; taking 25 subjects in each group. A matching control of 25 dental students was taken for comparison. Findings reveal that though the plaque index and gingival index values in all treatment groups were higher than control group, but the values in all the 4 groups were found within the range of good oral hygiene i.e. less than 1.50 exhibiting that the orthodontic appliances whether fixed, active removable or Myofunctional would not affect oral hygiene or gingival health adversely if a proper oral hygiene instructions, were followed.
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Affiliation(s)
- R Dubey
- Department of Orthodontics, College of Dentistry, Indore, India
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