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Article ; Online: Synthesis and characterization of Cr

Shalini Reghunath, B / Davis, Deepak / Sunaja Devi, K R

2021 Volume 283, Page(s) 131281

Abstract: ... which has significantly attracted the materials research. In this work, Cr ...

Abstract	MAX phase, a layered ternary carbide/nitride, displays both ceramic and metallic properties, which has significantly attracted the materials research. In this work, Cr
MeSH term(s)	Catalysis ; Light ; Water Purification
Language	English
Publishing date	2021-06-21
Publishing country	England
Document type	Journal Article
ZDB-ID	120089-6
ISSN	1879-1298 ; 0045-6535 ; 0366-7111
ISSN (online)	1879-1298
ISSN	0045-6535 ; 0366-7111
DOI	10.1016/j.chemosphere.2021.131281
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Article ; Online: On the Determination of Cr(VI) in Cr(III)-Rich Particulates: From the Failure of Official Methods to the Development of an Alternative Protocol.

Spinazzè, Andrea / Spanu, Davide / Della Bella, Pietro / Corti, Cristina / Borghi, Francesca / Fanti, Giacomo / Cattaneo, Andrea / Wise, William Robert / Davis, Stefan John / Cavallo, Domenico Maria / Recchia, Sandro

International journal of environmental research and public health

2022 Volume 19, Issue 19

Abstract: ... in the challenging determination of Cr(VI) in Cr(III)-rich particulate matter, and the development of a novel and ... to allow the study of Cr(III)/Cr(VI) interconversions during the extraction step. An original separation ... strategy based on Cr(OH) ...

Abstract	The goals of this work are the evaluation of the performances of official methods in the challenging determination of Cr(VI) in Cr(III)-rich particulate matter, and the development of a novel and robust analytical protocol for this issue. A liquid chromatography inductively coupled plasma mass spectrometry apparatus (LC-ICP-MS), together with an isotope-enriched spike addition technique, was used to allow the study of Cr(III)/Cr(VI) interconversions during the extraction step. An original separation strategy based on Cr(OH)
MeSH term(s)	Chromium/analysis ; Dust/analysis ; Ferric Compounds ; Ferrous Compounds ; Isotopes ; Mass Spectrometry/methods ; Particulate Matter/analysis ; Phosphates
Chemical Substances	Dust ; Ferric Compounds ; Ferrous Compounds ; Isotopes ; Particulate Matter ; Phosphates ; Chromium (0R0008Q3JB) ; chromium hexavalent ion (18540-29-9)
Language	English
Publishing date	2022-09-24
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph191912111
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Article ; Online: Is Heterotopic Ossification Removal From Alloplastic Temporomandibular Joint Prosthesis Using Er,Cr:YSGG Laser Superior to Conventional Methods?

Kelm, Ryan C / Neto, Mozart Queiroz / Liu, Songyun / Mercuri, Louis G / Pourzal, Robin / Lung, Kevin E / Davis, Clayton M

Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons

2022 Volume 80, Issue 12, Page(s) 1878–1892

Abstract: ... an erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser and compared the results ... were analyzed. The investigators hypothesize that HO removal with an Er,Cr:YSGG laser causes less ... Simulated HO removal was completed using a novel Er,Cr:YSGG laser method and conventional methods ...

Abstract	Purpose: Heterotopic ossification (HO) formed over the major components and fixation screw heads of an alloplastic temporomandibular joint replacement (TMJR) prosthesis can result in decreased quality of life, limited function, prosthesis failure, and hinder prosthesis revision, replacement, or removal. This study simulated HO removal from the major components and fixation screw heads of alloplastic TMJR prostheses using an erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser and compared the results to conventional methods of HO removal. The surface morphology and chemical structure of the exposed components were analyzed. The investigators hypothesize that HO removal with an Er,Cr:YSGG laser causes less damage to TMJR prosthesis components compared to conventional HO removal methods. Methods: This multiple test descriptive analysis simulated HO removal from TMJR prostheses mounted to stereolithic models. Simulated HO removal was completed using a novel Er,Cr:YSGG laser method and conventional methods which utilized a fissure carbide bur in a high-speed rotary instrument, a standard osteotome, and an ultrasonic aspirator. Surfaces exposed on the TMJR prostheses were analyzed for morphological or chemical change using scanning electron microscopy, energy dispersive X-ray spectroscopy, and Raman spectroscopy. Results: The Er,Cr:YSGG laser did not adversely affect the titanium screws or titanium components of the TMJR prostheses, while conventional methods of HO removal did. HO removal using the Er,Cr:YSGG laser and conventional methods both inflicted surface damage to the fossa ultrahigh molecular weight polyethylene component of the TMJR prostheses. Conclusion: Damage inflicted to titanium alloy or commercially pure titanium components of TMJR prostheses by conventional HO removal methods can be avoided by instead removing HO with an Er,Cr:YSGG laser. However, long exposure of the Er,Cr:YSGG laser to ultrahigh molecular weight polyethylene surfaces should be avoided. Additional research to expand on applications to other procedures and in other surgical fields is encouraged.
MeSH term(s)	Humans ; Lasers, Solid-State/therapeutic use ; Titanium ; Quality of Life ; Ossification, Heterotopic/surgery ; Polyethylenes ; Temporomandibular Joint/surgery
Chemical Substances	Titanium (D1JT611TNE) ; Polyethylenes
Language	English
Publishing date	2022-09-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	392404-x
ISSN	1531-5053 ; 0278-2391
ISSN (online)	1531-5053
ISSN	0278-2391
DOI	10.1016/j.joms.2022.08.020
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Article ; Online: A Chromium Hydroxide/MIL-101(Cr) MOF Composite Catalyst and Its Use for the Selective Isomerization of Glucose to Fructose.

Guo, Qiang / Ren, Limin / Kumar, Prashant / Cybulskis, Viktor J / Mkhoyan, K Andre / Davis, Mark E / Tsapatsis, Michael

Angewandte Chemie (International ed. in English)

2018 Volume 57, Issue 18, Page(s) 4926–4930

Abstract: A metal-organic framework (MOF)-based catalyst, chromium hydroxide/MIL-101(Cr), was prepared ... by a one-pot synthesis method. The combination of chromium hydroxide particles on and within Lewis acidic ...

Abstract	A metal-organic framework (MOF)-based catalyst, chromium hydroxide/MIL-101(Cr), was prepared by a one-pot synthesis method. The combination of chromium hydroxide particles on and within Lewis acidic MIL-101 accomplishes highly selective conversion of glucose to fructose in the presence of ethanol, matching the performance of optimized Sn-containing Lewis acidic zeolites. Differently from zeolites, NMR spectroscopy studies with isotopically labeled molecules demonstrate that isomerization of glucose to fructose on this catalyst, proceeds predominantly via a proton transfer mechanism.
Language	English
Publishing date	2018-03-23
Publishing country	Germany
Document type	Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
ZDB-ID	2011836-3
ISSN	1521-3773 ; 1433-7851
ISSN (online)	1521-3773
ISSN	1433-7851
DOI	10.1002/anie.201712818
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Article: Steam reforming kinetics of olefins and aromatics over Mn-Cr-O spinel oxides

Yang, Lu / Bukhovko, Maxim P / Malek, Andrzej / Li, Liwei / Jones, Christopher W / Agrawal, Pradeep K / Davis, Robert J

Journal of catalysis. 2021 May 29,

2021

Abstract: Catalytic steam reforming of propylene, benzene and toluene was investigated over Mn-Cr-O spinel ... for propylene reforming, whereas the Mn-rich Mn₁.₅Cr₁.₅O₄ spinel was the most active and stable catalyst ...

Abstract	Catalytic steam reforming of propylene, benzene and toluene was investigated over Mn-Cr-O spinel oxides with different stoichiometry. The catalysts were structurally stable during reforming conditions except for Mn₃O₄, which reduced in situ to MnO. The Cr₂O₃ catalyst showed the highest initial rate for propylene reforming, whereas the Mn-rich Mn₁.₅Cr₁.₅O₄ spinel was the most active and stable catalyst for aromatic reforming. Reforming rates of olefins and aromatics were comparable under 0.05 bar hydrocarbon and 0.40 bar steam at 873 K. The reforming rate of olefins and aromatics was first order in hydrocarbon and slightly inhibited by H₂O, which is consistent with a Mars-van Krevelen type mechanism. Of the hydrocarbons investigated, only the rate of toluene reforming was negative first order in excess H₂. Results from diffuse reflectance infrared Fourier transform spectroscopy of adsorbed toluene on a spinel catalyst suggest that H₂ inhibits the rapid oxidation of the methyl group of toluene.
Keywords	Fourier transform infrared spectroscopy ; benzene ; catalysts ; catalytic activity ; manganese monoxide ; oxidation ; propylene ; steam ; stoichiometry ; toluene
Language	English
Dates of publication	2021-0529
Publishing place	Elsevier Inc.
Document type	Article
Note	Pre-press version
ZDB-ID	1468993-5
ISSN	1090-2694 ; 0021-9517
ISSN (online)	1090-2694
ISSN	0021-9517
DOI	10.1016/j.jcat.2021.05.034
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Multifunctional role of Bcl-2 in malignant transformation and tumorigenesis of Cr(VI)-transformed lung cells.

Medan, Djordje / Luanpitpong, Sudjit / Azad, Neelam / Wang, Liying / Jiang, Bing-Hua / Davis, Mary E / Barnett, John B / Guo, Lan / Rojanasakul, Yon

PloS one

2012 Volume 7, Issue 5, Page(s) e37045

Abstract: ... epithelial cells to the carcinogenic hexavalent chromium Cr(VI) caused malignant transformation and Bcl-2 ... we showed that Bcl-2 plays an important role in the malignant properties of Cr(VI)-transformed cells ... of Cr(VI)-transformed cells. The role of Bcl-2 in malignant transformation and tumorigenesis was ...

Abstract	B-cell lymphoma-2 (Bcl-2) is an antiapoptotic protein known to be important in the regulation of apoptosis in various cell types. However, its role in malignant transformation and tumorigenesis of human lung cells is not well understood. We previously reported that chronic exposure of human lung epithelial cells to the carcinogenic hexavalent chromium Cr(VI) caused malignant transformation and Bcl-2 upregulation; however, the role of Bcl-2 in the transformation is unclear. Using a gene silencing approach, we showed that Bcl-2 plays an important role in the malignant properties of Cr(VI)-transformed cells. Downregulation of Bcl-2 inhibited the invasive and proliferative properties of the cells as well as their colony forming and angiogenic activities, which are upregulated in the transformed cells as compared to control cells. Furthermore, animal studies showed the inhibitory effect of Bcl-2 knockdown on the tumorigenesis of Cr(VI)-transformed cells. The role of Bcl-2 in malignant transformation and tumorigenesis was confirmed by gene silencing experiments using human lung carcinoma NCI-H460 cells. These cells exhibited aggressive malignant phenotypes similar to those of Cr(VI)-transformed cells. Knockdown of Bcl-2 in the H460 cells inhibited malignant and tumorigenic properties of the cells, indicating the general role of Bcl-2 in human lung tumorigenesis. Ingenuity Pathways Analysis (IPA) revealed potential effectors of Bcl-2 in tumorigenesis regulation. Additionally, using IPA together with ectopic expression of p53, we show p53 as an upstream regulator of Bcl-2 in Cr(VI)-transformed cells. Together, our results indicate the novel and multifunctional role of Bcl-2 in malignant transformation and tumorigenesis of human lung epithelial cells chronically exposed to Cr(VI).
MeSH term(s)	Animals ; Apoptosis/drug effects ; Cell Line, Tumor ; Cell Movement/drug effects ; Cell Proliferation/drug effects ; Cell Transformation, Neoplastic/drug effects ; Chromium/toxicity ; Gene Expression Regulation, Neoplastic/drug effects ; Gene Knockdown Techniques ; Gene Silencing ; Humans ; Lung/pathology ; Lung Neoplasms/blood supply ; Lung Neoplasms/genetics ; Lung Neoplasms/metabolism ; Lung Neoplasms/pathology ; Male ; Mice ; Neoplasm Invasiveness ; Neovascularization, Pathologic/metabolism ; Proto-Oncogene Proteins c-bcl-2/deficiency ; Proto-Oncogene Proteins c-bcl-2/genetics ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Tumor Suppressor Protein p53/metabolism
Chemical Substances	Proto-Oncogene Proteins c-bcl-2 ; Tumor Suppressor Protein p53 ; Chromium (0R0008Q3JB) ; chromium hexavalent ion (18540-29-9)
Language	English
Publishing date	2012-05-29
Publishing country	United States
Document type	Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
ISSN	1932-6203
ISSN (online)	1932-6203
DOI	10.1371/journal.pone.0037045
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Article ; Online: Multifunctional role of Bcl-2 in malignant transformation and tumorigenesis of Cr(VI)-transformed lung cells.

Djordje Medan / Sudjit Luanpitpong / Neelam Azad / Liying Wang / Bing-Hua Jiang / Mary E Davis / John B Barnett / Lan Guo / Yon Rojanasakul

PLoS ONE, Vol 7, Iss 5, p e

2012 Volume 37045

Abstract	B-cell lymphoma-2 (Bcl-2) is an antiapoptotic protein known to be important in the regulation of apoptosis in various cell types. However, its role in malignant transformation and tumorigenesis of human lung cells is not well understood. We previously reported that chronic exposure of human lung epithelial cells to the carcinogenic hexavalent chromium Cr(VI) caused malignant transformation and Bcl-2 upregulation; however, the role of Bcl-2 in the transformation is unclear. Using a gene silencing approach, we showed that Bcl-2 plays an important role in the malignant properties of Cr(VI)-transformed cells. Downregulation of Bcl-2 inhibited the invasive and proliferative properties of the cells as well as their colony forming and angiogenic activities, which are upregulated in the transformed cells as compared to control cells. Furthermore, animal studies showed the inhibitory effect of Bcl-2 knockdown on the tumorigenesis of Cr(VI)-transformed cells. The role of Bcl-2 in malignant transformation and tumorigenesis was confirmed by gene silencing experiments using human lung carcinoma NCI-H460 cells. These cells exhibited aggressive malignant phenotypes similar to those of Cr(VI)-transformed cells. Knockdown of Bcl-2 in the H460 cells inhibited malignant and tumorigenic properties of the cells, indicating the general role of Bcl-2 in human lung tumorigenesis. Ingenuity Pathways Analysis (IPA) revealed potential effectors of Bcl-2 in tumorigenesis regulation. Additionally, using IPA together with ectopic expression of p53, we show p53 as an upstream regulator of Bcl-2 in Cr(VI)-transformed cells. Together, our results indicate the novel and multifunctional role of Bcl-2 in malignant transformation and tumorigenesis of human lung epithelial cells chronically exposed to Cr(VI).
Keywords	Medicine ; R ; Science ; Q
Subject code	610
Language	English
Publishing date	2012-01-01T00:00:00Z
Publisher	Public Library of Science (PLoS)
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Demonstration of room-temperature laser action at 2.5 mum from Cr(2+):Cd(0.85)Mn(0.15)Te.

Hömmerich, U / Wu, X / Davis, V R / Trivedi, S B / Grasza, K / Chen, R J / Kutcher, S

Optics letters

2007 Volume 22, Issue 15, Page(s) 1180–1182

Abstract: Room-temperature laser action from Cr(2+)-doped Cd(0.85)Mn(0.15)Te has been demonstrated ... into the mid-infrared absorption band of Cr(2+) ions by use of the 1.907- mum output of a H(2) Raman-shifted Nd ... YAG laser. The output of the free-running Cr(2+):Cd(0.85)Mn(0.15)Te laser had a width of ~50 nm (FWHM ...

Abstract	Room-temperature laser action from Cr(2+)-doped Cd(0.85)Mn(0.15)Te has been demonstrated for what is believed to be the first time. We achieved pulsed laser operation centered at ~2.5mu m by pumping into the mid-infrared absorption band of Cr(2+) ions by use of the 1.907- mum output of a H(2) Raman-shifted Nd:YAG laser. The output of the free-running Cr(2+):Cd(0.85)Mn(0.15)Te laser had a width of ~50 nm (FWHM), and the slope efficiency was calculated to be 5.5% under nonoptimum conditions.
Language	English
Publishing date	2007-03-16
Publishing country	United States
Document type	Journal Article
ISSN	0146-9592
ISSN	0146-9592
DOI	10.1364/ol.22.001180
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Article ; Online: The Russian-American gallium experiment (SAGE) Cr Neutrino source measurement.

Abdurashitov / Gavrin / Girin / Gorbachev / Ibragimova / Kalikhov / Khairnasov / Knodel / Kornoukhov / Mirmov / Shikhin / Veretenkin / Vermul / Yants / Zatsepin / Bowles / Nico / Teasdale / Wark /

Cherry / Karaulov / Levitin / Maev / Nazarenko / Shkol'nik / Skorikov / Cleveland / Daily / Davis / Lande / Lee / Wildenhain / Khomyakov / Zvonarev / Elliott / Wilkerson

Physical review letters

1996 Volume 77, Issue 23, Page(s) 4708–4711

Language	English
Publishing date	1996-12-02
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.77.4708
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Article: Gastrointestinal transit of Sinemet CR in healthy volunteers.

Wilding, I R / Davis, S S / Melia, C D / Hardy, J G / Evans, D F / Short, A H / Sparrow, R A

Neurology

1989 Volume 39, Issue 11 Suppl 2, Page(s) 53–58

Abstract: The gastrointestinal transit and systemic absorption of Sinemet CR (50/200) and standard Sinemet ... release (CR) system was independent of food. Dosing after a light breakfast altered the gastric emptying ... profile of the CR formulation and led to significant differences in the plasma levels of levodopa. ...

Abstract	The gastrointestinal transit and systemic absorption of Sinemet CR (50/200) and standard Sinemet (25/100) have been studied in fasting and "fed" healthy human subjects. Both formulations were labeled with a gamma-emitting radionuclide, and their gastric emptying, colon arrival, and in vivo dissolution profiles were monitored using gamma scintigraphy. The standard dosage forms were found to disperse soon after administration and to empty rapidly from both the fasting and the "fed" stomach. The erosion of the controlled-release (CR) system was independent of food. Dosing after a light breakfast altered the gastric emptying profile of the CR formulation and led to significant differences in the plasma levels of levodopa.
MeSH term(s)	Antiparkinson Agents/administration & dosage ; Antiparkinson Agents/pharmacokinetics ; Biological Availability ; Carbidopa/administration & dosage ; Carbidopa/pharmacokinetics ; Clinical Trials as Topic ; Delayed-Action Preparations ; Double-Blind Method ; Drug Combinations/administration & dosage ; Drug Combinations/pharmacokinetics ; Eating ; Gastric Emptying/drug effects ; Gastrointestinal Transit/drug effects ; Humans ; Levodopa/administration & dosage ; Levodopa/pharmacokinetics ; Male ; Random Allocation ; Tablets
Chemical Substances	Antiparkinson Agents ; Delayed-Action Preparations ; Drug Combinations ; Tablets ; carbidopa, levodopa drug combination ; Levodopa (46627O600J) ; Carbidopa (MNX7R8C5VO)
Language	English
Publishing date	1989-11
Publishing country	United States
Document type	Clinical Trial ; Journal Article
ZDB-ID	207147-2
ISSN	1526-632X ; 0028-3878
ISSN (online)	1526-632X
ISSN	0028-3878
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