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( Pavan Dhoble ),( Philip Abraham ),( Devendra Desai ),( Anand Joshi ),( Tarun Gupta ),( Shachish Doctor ),( Anand Deshpande ),( Rajeshwari Basavanna ) 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.4
Background/Aims Most patients with irritable bowel syndrome (IBS) report food-related aggravation of symptoms. Wheat/gluten is one of the most commonly incriminated. We studied the prevalence of self-reported wheat sensitivity in patients with IBS and in a healthy population from a region in India consuming mixed-cereal diets, correlated it with serological and human leukocyte antigen (HLA) markers of celiac disease, and evaluated the response to a wheat-free diet. Methods We surveyed 204 patients with IBS and 400 healthy persons for self-reported wheat sensitivity. Testing for IgA anti-tissue transglutaminase and HLA DQ2 or DQ8 was done in individuals who reported wheat sensitivity. Consenting persons with wheat sensitivity were put on wheat-free diet and monitored for symptom change. Results Twenty-three of 204 patients with IBS (11.3%) and none of the healthy subjects self-reported wheat sensitivity. Of 23 patients, 14 (60.9%) were positive for HLA DQ2 or DQ8 and none for anti-tissue transglutaminase antibody. After 6 weeks on wheat-free diet, all 19 participating patients reported clinical improvement; fewer patients had bloating, diarrhea, constipation, and easy fatigue. Conclusions Eleven percent of patients with IBS self-reported wheat sensitivity. None of them had positive celiac serology; 60.9% were positive for HLA DQ2 and DQ8, suggesting a possible genetic basis. All of them improved symptomatically on a wheat-free diet. (J Neurogastroenterol Motil 2021;27:596-601)
Baig, N.,Dhoble, N.S.,Yerpude, A.N.,Singh, V.,Dhoble, S.J. Wissenschaftliche Verlagsgesellschaft m. b. H 2016 Optik Vol.127 No.16
<P>In this paper we report the photoluminescence (PL) characteristics of Dy3+, Sm3+, Eu3+ and Tb3+ doped Na3Pb2(SO4)(3)Cl phosphors prepared by wet chemical method. Prepared phosphors were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM), color co-ordinates and photoluminescence (PL) properties. The emission spectra of Na3Pb2(SO4)(3)Cl:Dy3+ phosphor show the characteristic emission of Dy3+ ions peaking at 478 nm and 573 nm (lambda ex = 390 nm), owing to transitions of F-4(9/2) -> H-6(15/2) and F-4(9/2) -> (6)H(13/)2 receptively. Under 396 nm excitation the Na3Pb2(SO4)(3)Cl:Eu3+ phosphor shows emission at 594 nm and 616 nm due to D-5(0) -> F-7(1) and D-5(0) -> F-7(2) transitions of Eu3+ ions respectively. When Na3Pb2(SO4)(3)Cl:Tb3+ phosphor was excited by 380 nm, the emission spectrum showed intense green band at 545 nm due to D-5(4) -> F-7(5) transition in Tb3+ ion. The PL emission spectrum of Na3Pb2(SO4)(3)Cl:Sm3+ phosphors by 405 nm excitation gave an emission at 562 nm ((4)G(5/2) -> H-6(5/2)), 598 nm ((4)G(5/2) -> H-6(7/2)) and 643 nm ((4)G(5/2) -> H-6(9/2)). The CIE color coordinates indicated that all the above phosphors were suitable as a white light -emitting phosphor. SEM studies of the phosphors show that grain size of the powders prepared by the wet chemical method is about ten micrometers range. From the obtained results it can be concluded that Dy3+, Sm3+ Eu3+ and Tb3+ doped Na3Pb2(SO4)(3)Cl phosphors are potential candidates for solid state lighting applications in green technology. (C) 2016 Elsevier GmbH. All rights reserved.</P>
Solution combustion synthesis of Dy(3+) and Ce(3+) activated Na2ZnSi2O6 phosphors.
Pawade, V B,Shinde, K N,Dhoble, N S,Park, K,Dhoble, S J American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.8
<P>Here we first time reported Dy(3+) and Ce(3+) luminescence in novel Na2ZnSi2O6 phosphors by solution combustion synthesis prepared at 550 C. Emission spectra of Na2ZnSi2O6:Dy(3+) phosphor was observed at 470 nm and 576 nm keeping excitation wavelength at 350 nm, where as Na2ZnSi2O6:Ce(3+) shows emission band at 452 nm monitoring excitation at 354 nm. XRD analysis was carried out to observe crystalline nature of the prepared phosphor.</P>
Gupta, K.K.,Kadam, R.M.,Dhoble, N.S.,Lochab, S.P.,Singh, V.,Dhoble, S.J. Elsevier Sequoia 2016 JOURNAL OF ALLOYS AND COMPOUNDS Vol.688 No.2
In this study, we have synthesized Dy<SUP>3+</SUP> activated Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F (S-FAP) phosphors by sol-gel synthesis method. The synthesized phosphors were characterized by X-ray diffraction pattern (XRD), scanning electron microscopic (SEM), photoluminescence (PL) and thermoluminescence (TL) for structural, morphological and luminescent properties. Dy<SUP>3+</SUP> activated Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F phosphor shows its characteristic PL emission at 481 nm and 574 nm due to <SUP>4</SUP>F<SUB>9/2</SUB> → <SUP>6</SUP>H<SUB>15/2</SUB> and <SUP>4</SUP>F<SUB>9/2</SUB> → <SUP>6</SUP>H<SUB>13/2</SUB> transitions, respectively. TL characteristics of Dy<SUP>3+</SUP> doped Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F phosphors were taken after irradiation by <SUP>60</SUP>Co gamma exposure. Two separate TL peaks at 126 <SUP>o</SUP>C and 279 <SUP>o</SUP>C were observed in case of Dy<SUP>3+</SUP> doped phosphor. Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F:Dy<SUP>3+</SUP> phosphor was irradiated within a wide range of exposure of 50 Gy to 7 kGy doses. Linearity was found up to 2 kGy and thereafter TL response saturates. Fading study was also carried out over the duration of six weeks for Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F phosphor. Trapping parameters were calculated using Chen's peak shape method, initial rise method and various heating rate method. Glow curve is deconvoluted using computerized glow curve deconvolution program. TL sensitivity of Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F:Dy<SUP>3+</SUP> phosphor is found to be less by a factor of 2.08 than commercially used CaSO<SUB>4</SUB>:Dy phosphor. In order to identify the defect centers formed upon γ-ray irradiation in Sr<SUB>5</SUB>(PO<SUB>4</SUB>)<SUB>3</SUB>F:Dy<SUP>3+</SUP> phosphor, EPR measurements were carried out on un-irradiated and irradiated phosphors.
Shinde, K N,Dhoble, S J,Yoon, S J,Park, K American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.8
<P>A series of Tb(3+)-activated NaLi2PO4 novel nano-crystalline phosphors was synthesized by the solution combustion method. The prepared Na(1-x)Li2PO4:xTb(3+) (0.01 x 0.1) phosphors crystallized in the orthorhombic crystal structure. Its effective absorption in the near ultraviolet range allowed highly efficient green emission. The Na(1-x)Li2PO4:xTb(3+) phosphors showed characteristic (5)D4 --> (7)FJ (J = 3, 4, 5, and 6) transitions of Tb(3+), i.e., (5)D4 --> (7)F6 (488 nm), (5)D4 --> (7)F5 (545 nm), (5)D4 --> (7)F4 (583 nm), and (5)D4 --> (7)F3 (622 nm). The Na0.95Li2PO4:0.05Tb(3+) phosphor showed the most excellent emission efficiency. The present work suggests that the Na0.95Li2PO4:0.05Tb(3+) is a potential green-emitting phosphor for near ultraviolet excited light emitting diodes.</P>
Optical Properties of EuxRe(1−x)(TTA)3Phen Organic Complexes in Different Solvents
N. Thejo Kalyani,S. J. Dhoble,안정선,Ramchandra Balaji Pode 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.4
Optical absorption spectra of Eu(TTA)3Phen (TTA: Thenoyl Trifluro Acetone) and EuxRe(1−x)(TTA)3Phen (where Re = Y, Tb) organic luminescent complexes in different organic solvents are measured to study the shift of the π → π* and the n → π* optical transitions due to Eu3+ion and β-diketonate moieties. All complexes show good solubility in different basic and acidic solvents. Two optical absorption peaks observed in the UV region of the spectra of solvated complexes shift when the solvent is changed. With a variation in the solvent from basic to acidic, staggering differences in optical absorptions are noticed. Absorption peaks shift bathochromically by a few nm as the solvent varies from basic to acidic. The optical energy band gaps of EuxRe(1−x)(TTA)3Phen are very similar for all the solvents used. A substantial dependence of the electronic absorption spectra of Eu complexes on the solvent is reported.