Base de dados : MEDLINE
Pesquisa : D01.220 [Categoria DeCS]
Referências encontradas : 1002 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 101 ir para página                         

  1 / 1002 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29311447
[Au] Autor:Kataoka Y; Watanabe T; Hayashi K; Ozawa R; Takizawa K; Akiyama H
[Ad] Endereço:National Institute of Health Sciences.
[Ti] Título:[Surveillance of Chromium(VI) Concentrations in Mineral Water Products].
[So] Source:Shokuhin Eiseigaku Zasshi;58(6):275-280, 2017.
[Is] ISSN:1882-1006
[Cp] País de publicação:Japan
[La] Idioma:jpn
[Ab] Resumo:We developed and evaluated a method of quantifying chromium(VI) in mineral water (MW). After a performance evaluation, we performed a surveillance of chromium(VI) concentrations in 150 kinds of MW products purchased from markets in 2016. Recovery rates, as examined by using 150 spiked samples prepared from the purchased MW products, ranged from 93 to 107%. These results strongly suggest that the validated method is suitable for quantifying chromium(VI) in MW. Chromium(VI) was detected in 65 kinds of MW products; the detection rate was 43%. The minimum concentration of chromium(VI) was 0.0001 mg/L and the maximum was 0.0019 mg/L. The median value of chromium(VI) concentration was 0.0003 mg/L. In most of the products in which chromium(VI) was detected, the concentration ranged from 0.0001 to 0.0002 mg/L. No products were found with concentrations higher than the value (0.05 mg/L) set by the Food Sanitation Law as the specification for MW.
[Mh] Termos MeSH primário: Compostos de Cromo/análise
Águas Minerais/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Cromatografia por Troca Iônica/instrumentação
Cromatografia por Troca Iônica/métodos
Compostos de Cromo/isolamento & purificação
Legislação sobre Alimentos/normas
Águas Minerais/normas
Poluentes Químicos da Água/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Compounds); 0 (Mineral Waters); 0 (Water Pollutants, Chemical)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180123
[Lr] Data última revisão:
180123
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180110
[St] Status:MEDLINE
[do] DOI:10.3358/shokueishi.58.275


  2 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28609285
[Au] Autor:Minchenko DO; Tsymbal DO; Yavorovsky OP; Solokha NV; Minchenko OH
[Ad] Endereço:.
[Ti] Título:Expression of genes encoding IGFBPs, SNARK, CD36, and PECAM1 in the liver of mice treated with chromium disilicide and titanium nitride nanoparticles.
[So] Source:Endocr Regul;51(2):84-95, 2017 Apr 25.
[Is] ISSN:1210-0668
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: The aim of the present study was to examine the effect of chromium disilicide and titanium nitride nanoparticles on the expression level of genes encoding important regulatory factors (IGFBP1, IGFBP2, IGFBP3, IGFBP4, IGFBP5, SNARK/NUAK2, CD36, and PECAM1/CD31) in mouse liver for evaluation of possible toxic effects of these nanoparticles. METHODS: Male mice received 20 mg chromium disilicide nanoparticles (45 nm) and titanium nitride nanoparticles (20 nm) with food every working day for 2 months. The expression of IGFBP1, IGFBP2, IGFBP3, IGFBP4, IGFBP5, SNARK, CD36, and PECAM1 genes in mouse liver was studied by quantitative polymerase chain reaction. RESULTS: Treatment of mice with chromium disilicide nanoparticles led to down-regulation of the expression of IGFBP2, IGFBP5, PECAM1, and SNARK genes in the liver in comparison with control mice, with more prominent changes for SNARK gene. At the same time, the expression of IGFBP3 and CD36 genes was increased in mouse liver upon treatment with chromium disilicide nanoparticles. We have also shown that treatment with titanium nitride nanoparticles resulted in down-regulation of the expression of IGFBP2 and SNARK genes in the liver with more prominent changes for SNARK gene. At the same time, the expression of IGFBP3, IGFBP4, and CD36 genes was increased in the liver of mice treated with titanium nitride nanoparticles. Furthermore, the effect of chromium disilicide nanoparticles on IGFBP2 and CD36 genes expression was significantly stronger as compared to titanium nitride nanoparticles. CONCLUSIONS: The results of this study demonstrate that chromium disilicide and titanium nitride nanoparticles have variable effects on the expression of IGFBP2, IGFBP3, IGFBP4, IGFBP5, SNARK, CD36, and PECAM1 genes in mouse liver, which may reflect the genotoxic activities of the studied nanoparticles.
[Mh] Termos MeSH primário: Expressão Gênica/efeitos dos fármacos
Fígado/efeitos dos fármacos
Nanopartículas
RNA Mensageiro/efeitos dos fármacos
Titânio/farmacologia
[Mh] Termos MeSH secundário: Animais
Antígenos CD36/efeitos dos fármacos
Antígenos CD36/genética
Compostos de Cromo/farmacologia
Regulação para Baixo
Proteína 1 de Ligação a Fator de Crescimento Semelhante à Insulina/efeitos dos fármacos
Proteína 1 de Ligação a Fator de Crescimento Semelhante à Insulina/genética
Proteína 2 de Ligação a Fator de Crescimento Semelhante à Insulina/efeitos dos fármacos
Proteína 2 de Ligação a Fator de Crescimento Semelhante à Insulina/genética
Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/efeitos dos fármacos
Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/genética
Proteína 4 de Ligação a Fator de Crescimento Semelhante à Insulina/efeitos dos fármacos
Proteína 4 de Ligação a Fator de Crescimento Semelhante à Insulina/genética
Fígado/metabolismo
Masculino
Camundongos
Molécula-1 de Adesão Celular Endotelial de Plaquetas/efeitos dos fármacos
Molécula-1 de Adesão Celular Endotelial de Plaquetas/genética
Reação em Cadeia da Polimerase
Proteínas Serina-Treonina Quinases/efeitos dos fármacos
Proteínas Serina-Treonina Quinases/genética
RNA Mensageiro/metabolismo
Reação em Cadeia da Polimerase Via Transcriptase Reversa
Compostos de Silício/farmacologia
Regulação para Cima
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (CD36 Antigens); 0 (Chromium Compounds); 0 (Insulin-Like Growth Factor Binding Protein 1); 0 (Insulin-Like Growth Factor Binding Protein 2); 0 (Insulin-Like Growth Factor Binding Protein 3); 0 (Insulin-Like Growth Factor Binding Protein 4); 0 (Platelet Endothelial Cell Adhesion Molecule-1); 0 (RNA, Messenger); 0 (Silicon Compounds); 6RW464FEFF (titanium nitride); D1JT611TNE (Titanium); EC 2.7.11.1 (Protein-Serine-Threonine Kinases); EC 2.7.11.1 (SNARK protein, mouse)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170614
[St] Status:MEDLINE


  3 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28582420
[Au] Autor:Beshkar F; Zinatloo-Ajabshir S; Bagheri S; Salavati-Niasari M
[Ad] Endereço:Institute of Nano Science and Nano Technology, University of Kashan, Kashan, I. R. Iran.
[Ti] Título:Novel preparation of highly photocatalytically active copper chromite nanostructured material via a simple hydrothermal route.
[So] Source:PLoS One;12(6):e0158549, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Highly photocatalytically active copper chromite nanostructured material were prepared via a novel simple hydrothermal reaction between [Cu(en)2(H2O)2]Cl2 and [Cr(en)3]Cl3.3H2O at low temperature, without adding any pH regulator or external capping agent. The as-synthesized nanostructured copper chromite was analyzed by transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy, energy dispersive X-ray microanalysis (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy. Results of the morphological investigation of the as-synthesized products illustrate that the shape and size of the copper chromite depended on the surfactant sort, reaction duration and temperature. Moreover, the photocatalytic behavior of as-obtained copper chromite was evaluated by photodegradation of acid blue 92 (anionic dye) as water pollutant.
[Mh] Termos MeSH primário: Compostos de Cromo/química
Cobre/química
Nanoestruturas/química
Naftalenos/isolamento & purificação
Poluentes Químicos da Água/isolamento & purificação
[Mh] Termos MeSH secundário: Biodegradação Ambiental
Catálise
Água Doce/química
Temperatura Alta
Seres Humanos
Nanoestruturas/ultraestrutura
Tamanho da Partícula
Processos Fotoquímicos
Propriedades de Superfície
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acid Blue 92); 0 (Chromium Compounds); 0 (Naphthalenes); 0 (Water Pollutants, Chemical); 789U1901C5 (Copper)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170606
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0158549


  4 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28544901
[Au] Autor:Xue Y; Zheng S; Sun Z; Zhang Y; Jin W
[Ad] Endereço:National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
[Ti] Título:Alkaline electrochemical advanced oxidation process for chromium oxidation at graphitized multi-walled carbon nanotubes.
[So] Source:Chemosphere;183:156-163, 2017 Sep.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Alkaline electrochemical advanced oxidation processes for chromium oxidation and Cr-contaminated waste disposal were reported in this study. The highly graphitized multi-walled carbon nanotubes g-MWCNTs modified electrode was prepared for the in-situ electrochemical generation of HO . RRDE test results illustrated that g-MWCNTs exhibited much higher two-electron oxygen reduction activity than other nanocarbon materials with peak current density of 1.24 mA cm , %HO of 77.0% and onset potential of -0.15 V (vs. Hg/HgO). It was originated from the highly graphitized structure and good electrical conductivity as illustrated from the Raman, XRD and EIS characterizations, respectively. Large amount of reactive oxygen species (HO and ·OH) were in-situ electro-generated from the two-electron oxygen reduction and chromium-induced alkaline electro-Fenton-like reaction. The oxidation of Cr(III) was efficiently achieved within 90 min and the conversion ratio maintained more than 95% of the original value after stability test, offering an efficient and green approach for the utilization of Cr-containing wastes.
[Mh] Termos MeSH primário: Cromo/análise
Técnicas Eletroquímicas/métodos
Grafite/química
Resíduos Industriais/análise
Nanotubos de Carbono/química
Eliminação de Resíduos Líquidos/métodos
[Mh] Termos MeSH secundário: Cromo/química
Compostos de Cromo
Técnicas Eletroquímicas/instrumentação
Eletrodos
Concentração de Íons de Hidrogênio
Hidróxidos/química
Oxirredução
Compostos de Potássio/química
Propriedades de Superfície
Eliminação de Resíduos Líquidos/instrumentação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Compounds); 0 (Hydroxides); 0 (Industrial Waste); 0 (Nanotubes, Carbon); 0 (Potassium Compounds); 0R0008Q3JB (Chromium); 7782-42-5 (Graphite); WZH3C48M4T (potassium hydroxide); X5Z09SU859 (chromic oxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171003
[Lr] Data última revisão:
171003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170526
[St] Status:MEDLINE


  5 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28380619
[Au] Autor:Kim BG; Liu Y; Stein HH
[Ti] Título:Effects of ileal digesta collection time on standardized ileal digestibility of amino acids in corn, soybean meal, and distiller's dried grains with solubles fed to growing pigs.
[So] Source:J Anim Sci;95(2):789-798, 2017 Feb.
[Is] ISSN:1525-3163
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The objective of this experiment was to determine the minimum collection time needed to obtain representative samples of ileal digesta from pigs fed different types of diets. Eight barrows with an initial BW of 34.6 kg (SD 2.1) were individually fitted with a T-cannula in the distal ileum and randomly allotted to a replicated 4 × 4 Latin square design with 4 diets and 4 periods per square. Three diets contained corn, soybean meal (SBM), or distiller's dried grains with solubles (DDGS) as the sole source of CP. An N-free diet was also prepared. All diets contained 0.5% chromic oxide as an indigestible marker. Equal meals were provided at 0800 and 2000 h. Ileal digesta samples were collected in 2-h intervals from 0800 to 2000 h during the last 3 d of each 7-d period. When pigs were fed the corn diet, the standardized ileal digestibility (SID) of most indispensable AA and dispensable AA increased and then decreased (quadratic, < 0.05) during each of the six 2-h periods. The SID of most AA were less ( < 0.05) if the ileal digesta samples were collected from 1800 to 2000 h or from 1600 to 2000 h compared with the SID values from the ileal samples collected over the entire 12-h period. When pigs were fed the SBM diet, the SID of Ile, Leu, Thr, Trp, Val, Ala, and Cys increased and then decreased (quadratic, < 0.05) but the SID of all other AA linearly decreased ( < 0.05) during the six 2-h periods. The SID of almost all AA were greater ( < 0.05) if the ileal samples were collected from 0800 to 1000 h, from 0800 to 1200 h, from 1000 to 1400 h, or from 0800 to 1400 h but less ( < 0.05) if collected from 1600 to 1800 h, from 1800 to 2000 h, from 1600 to 2000 h, or from 1400 to 2000 h compared with the SID values from the ileal samples collected over the entire 12-h period. When pigs were fed the DDGS-based diet, the SID of Ile, Leu, Lys, Phe, Trp, Val, and Tyr increased and then decreased (quadratic, < 0.05) during the six 2-h periods. The SID of most AA were less ( < 0.05) if the ileal samples were collected from 1800 to 2000 h compared with the SID values from the ileal samples collected over the entire 12-h period. In conclusion, diurnal variations in SID of AA in pigs indicate that 6 h of ileal sample collection starting 4 or 6 h after feeding may provide representative samples of ileal digesta from pigs fed different types of diets.
[Mh] Termos MeSH primário: Aminoácidos/metabolismo
Ração Animal/análise
Digestão/fisiologia
Feijão de Soja/química
Suínos/fisiologia
Zea mays/química
[Mh] Termos MeSH secundário: Aminoácidos/química
Fenômenos Fisiológicos da Nutrição Animal
Animais
Compostos de Cromo
Dieta/veterinária
Comportamento Alimentar
Íleo/metabolismo
Masculino
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amino Acids); 0 (Chromium Compounds); X5Z09SU859 (chromic oxide)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170406
[St] Status:MEDLINE
[do] DOI:10.2527/jas.2016.1082


  6 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28233031
[Au] Autor:Μolla A; Ioannou Z; Mollas S; Skoufogianni E; Dimirkou A
[Ad] Endereço:Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Fytoko St., Volos, Magnesia, Greece. katrinmol@yahoo.gr.
[Ti] Título:Removal of Chromium from Soils Cultivated with Maize (Zea Mays) After the Addition of Natural Minerals as Soil Amendments.
[So] Source:Bull Environ Contam Toxicol;98(3):347-352, 2017 Mar.
[Is] ISSN:1432-0800
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The efficiency of natural minerals, i.e. zeolite, bentonite and goethite, regarding the retention of chromium, from maize was examined. Specifically, 1.0 kg of soil, 1.0 g of soil amendment and either 50 mg L Cr(III) or 1 mg L Cr(VI) were added in plant pots. Then, seeds of maize were cultivated. Each treatment was repeated three times. The statistical results of the experiments were analyzed by LSD test. Cr(III) addition in soil has shown that zeolite was the only amendment that increased the dry weight. Zeolite and bentonite reduced significantly the total chromium in plants after the addition of 50 mg L Cr(III). The addition of Cr(VI) in soil has shown that bentonite was the only amendment that increased the dry weight of biomass and the plants' height. All soil amendments reduced to zero the total chromium concentration measured to plants after the addition of 1 mg L Cr(VI).
[Mh] Termos MeSH primário: Bentonita/farmacologia
Cromo/isolamento & purificação
Cromo/metabolismo
Compostos de Ferro/farmacologia
Minerais/farmacologia
Solo/química
Zea mays/efeitos dos fármacos
Zea mays/metabolismo
Zeolitas/farmacologia
[Mh] Termos MeSH secundário: Biomassa
Cromo/toxicidade
Compostos de Cromo/toxicidade
Nitratos/toxicidade
Poluentes do Solo/isolamento & purificação
Poluentes do Solo/metabolismo
Poluentes do Solo/toxicidade
Zea mays/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Compounds); 0 (Iron Compounds); 0 (Minerals); 0 (Nitrates); 0 (Soil); 0 (Soil Pollutants); 0R0008Q3JB (Chromium); 1302-78-9 (Bentonite); 1310-14-1 (goethite); 1318-02-1 (Zeolites); 18540-29-9 (chromium hexavalent ion); 7BHJ7466GL (chromium dioxide); C6H0RE016B (chromium nitrate)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170225
[St] Status:MEDLINE
[do] DOI:10.1007/s00128-017-2044-3


  7 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27984795
[Au] Autor:Rahman MM; Balkhoyor HB; Asiri AM
[Ad] Endereço:Chemistry Department, King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia; Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah 21589, P.O. Box 80203, Saudi Arabia. Electronic address: mmrahman@kau.edu.sa.
[Ti] Título:Phenolic sensor development based on chromium oxide-decorated carbon nanotubes for environmental safety.
[So] Source:J Environ Manage;188:228-237, 2017 Mar 01.
[Is] ISSN:1095-8630
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A nanocomposite (NC) composed of chromium(III)oxide nanomaterials decorated carbon nanotubes (Cr O -CNT NC) was prepared via a simple solution method with reducing agents in an alkaline medium. The Cr O -CNT NC was characterized using ultraviolet-visible (UV/Vs.) spectroscopy, Fourier-transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (XEDS), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and field-emission scanning electron microscopy (FESEM). The Cr O -CNT composite was deposited on a flat glassy carbon electrode (GCE) with conducting nafion (5%) binders to produce a sensor that exhibited fast response and high selectivity toward 4-methoxyphenol (4MP) in phosphate buffer phase at pH 7. Furthermore, the sensor performance parameters, including the sensitivity, lower detection range, reliability, and reproducibility, ease of integration, long-term stability, and selectivity were investigated in detail. The calibration plot was found to be linear in the concentration range of 0.01 nM-0.1 µM. The sensitivity and detection limit were calculated as 1.4768 µA cm µM and 0.06428 ± 0.0002 nM (at a signal-to-noise ratio of 3), respectively. Thus, it was concluded that the proposed selective and efficient sensor represents a promising approach to effectively detect toxic phenolic compounds in the environment with acceptable and reliable results.
[Mh] Termos MeSH primário: Anisóis/análise
Compostos de Cromo/química
Nanocompostos/química
Nanotubos de Carbono/química
[Mh] Termos MeSH secundário: Anisóis/química
Eletrodos
Polímeros de Fluorcarboneto/química
Limite de Detecção
Microscopia Eletrônica de Varredura
Nanocompostos/ultraestrutura
Nanotubos de Carbono/ultraestrutura
Espectroscopia Fotoeletrônica
Difração de Pó
Reprodutibilidade dos Testes
Espectroscopia de Infravermelho com Transformada de Fourier
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anisoles); 0 (Chromium Compounds); 0 (Fluorocarbon Polymers); 0 (Nanotubes, Carbon); 39464-59-0 (perfluorosulfonic acid); 6HT8U7K3AM (mequinol); X5Z09SU859 (chromic oxide)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170817
[Lr] Data última revisão:
170817
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161217
[St] Status:MEDLINE


  8 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27863078
[Au] Autor:Yun YS; Kim TY; Yun D; Lee KR; Han JW; Yi J
[Ad] Endereço:World Class University Program of Chemical Convergence for Energy&Environment, Institute of Chemical Processes, School of Chemical and Biological Engineering, Seoul National University, Seoul, 151-742, Republic of Korea.
[Ti] Título:Understanding the Reaction Mechanism of Glycerol Hydrogenolysis over a CuCr O Catalyst.
[So] Source:ChemSusChem;10(2):442-454, 2017 Jan 20.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The reaction mechanism of glycerol hydrogenolysis to 1,2-propanediol over a spinel CuCr O catalyst was investigated by using DFT calculations. Theoretical models were developed from the results of experimental characterization. Adsorption configurations and energetics of the reactant, intermediates, final product, and transition states were calculated on Cu(1 1 1) and CuCr O (1 0 0). Based on our DFT results, we found that the formation of acetol is preferred to that of 3-hydroxypropionaldehyde thermodynamically and kinetically on both surfaces. For glycerol hydrogenolysis to 1,2-propanediol, the CuCr O surface is less exothermic but more kinetically favorable than the Cu surface. The low activation barrier during the reaction on the CuCr O surface is attributed to the unique surface structure; the cubic spinel structure provides a stable adsorption site on which reactants are allowed to be dehydrated and hydrogenated easily with the characteristic adsorption configuration. The role of the Cu and Cr atoms in a CuCr O surface were revealed. The results of reaction tests supported our theoretical calculations.
[Mh] Termos MeSH primário: Compostos de Cromo/química
Cobre/química
Glicerol/química
Hidrogênio/química
[Mh] Termos MeSH secundário: Acetona/análogos & derivados
Acetona/química
Adsorção
Catálise
Modelos Moleculares
Conformação Molecular
Propilenoglicol/química
Teoria Quântica
Propriedades de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Compounds); 1364PS73AF (Acetone); 6DC9Q167V3 (Propylene Glycol); 789U1901C5 (Copper); 7I7YM0835W (acetol); 7YNJ3PO35Z (Hydrogen); PDC6A3C0OX (Glycerol)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161119
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201601269


  9 / 1002 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27761845
[Au] Autor:Liu Y; Hao P; Zhang X; Zhao X; Liu Y; Liu J
[Ad] Endereço:College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, China.
[Ti] Título:Effects of Excess Cr on Trace Element Contents in the Brain and Serum in Chicken.
[So] Source:Biol Trace Elem Res;177(1):180-186, 2017 May.
[Is] ISSN:1559-0720
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:This study aimed to investigate the effects of chromic chloride (CrCl ) on Ca, Mg, Mn, Fe, Cu, and Zn contents in the brain and serum of chicken. Seventy-two chickens were randomly divided into four groups and treated with different doses of CrCl via drinking water: 0, 1/8, 1/4, and 1/2 LD for 42 days. The contents of the elements were evaluated through inductively coupled plasma mass spectrometry. Results showed that Cr contents in the brain and serum were higher than those in the control groups, although no significant dose-dependent changes (P > 0.05) in brain of the Cr-treated groups were observed at 42 days. As exposure time was prolonged and CrCl dosage was increased, Ca contents increased (P < 0.05). Mg and Cu contents in serum decreased; by contrast, Mg and Cu contents initially increased and then decreased in the brain. Fe and Zn contents in the serum increased; conversely, Fe and Zn contents in the brain decreased. CrCl exposure did not significantly affect Mn contents at 14 or 28 days, but significantly decreased (P < 0.05) at 42 days. Therefore, excess Cr intake can disrupt absorption and deposition of other trace elements in the brain and serum; the blood-brain barrier may prevent the accumulation of these elements in the brain exposed to CrCl .
[Mh] Termos MeSH primário: Encéfalo/efeitos dos fármacos
Encéfalo/metabolismo
Cloretos/administração & dosagem
Cloretos/farmacologia
Compostos de Cromo/administração & dosagem
Compostos de Cromo/farmacologia
Oligoelementos/sangue
Oligoelementos/metabolismo
[Mh] Termos MeSH secundário: Animais
Galinhas
Relação Dose-Resposta a Droga
Espectrometria de Massas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chlorides); 0 (Chromium Compounds); 0 (Trace Elements); KB1PCR9DMW (chromic chloride)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170626
[Lr] Data última revisão:
170626
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161021
[St] Status:MEDLINE
[do] DOI:10.1007/s12011-016-0875-0


  10 / 1002 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27751866
[Au] Autor:Adam C; Wohlfarth J; Haußmann M; Sennefelder H; Rodin A; Maler M; Martin SF; Goebeler M; Schmidt M
[Ad] Endereço:Department of Dermatology, University Hospital Würzburg, Germany.
[Ti] Título:Allergy-Inducing Chromium Compounds Trigger Potent Innate Immune Stimulation Via ROS-Dependent Inflammasome Activation.
[So] Source:J Invest Dermatol;137(2):367-376, 2017 Feb.
[Is] ISSN:1523-1747
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Chromium allergy is a common occupational skin disease mediated by chromium (VI)-specific T cells that induce delayed-type hypersensitivity in sensitized individuals. Additionally, chromium (VI) can act as an irritant. Both responses critically require innate immune activation, but if and how chromium (VI) elicits this signal is currently unclear. Using human monocytes, primary human keratinocytes, and murine dendritic cells we show that chromium (VI) compounds fail to trigger direct proinflammatory activation but potently induce processing and secretion of IL-1ß. IL-1ß release required priming by phorbol-ester or toll-like receptor stimulation and was prevented by inhibition of K efflux, NLRP3 depletion or caspase-1 inhibition, identifying chromium (VI) as a hapten activator of the NLRP3 inflammasome. Inflammasome activation was initiated by mitochondrial reactive oxygen species production triggered by chromium (VI), as indicated by sensitivity to treatment with the ROS scavenger N-acetyl cysteine and a coinciding failure of K efflux, caspase-1, or NLRP3 inhibition to prevent mitochondrial reactive oxygen species accumulation. IL-1ß release further correlated with cytotoxicity that was secondary to reactive oxygen species, K efflux, and NLRP3 activation. Trivalent chromium was unable to induce mitochondrial reactive oxygen species production, inflammasome activation, and cytotoxicity, suggesting that oxidation state-specific differences in mitochondrial reactivity may determine inflammasome activation and allergic/irritant capacity of different chromium compounds.
[Mh] Termos MeSH primário: Compostos de Cromo/toxicidade
Hipersensibilidade/etiologia
Imunidade Inata/efeitos dos fármacos
Proteína 3 que Contém Domínio de Pirina da Família NLR/fisiologia
Espécies Reativas de Oxigênio/metabolismo
[Mh] Termos MeSH secundário: Trifosfato de Adenosina/secreção
Animais
Células Cultivadas
Hipersensibilidade/imunologia
Interleucina-1beta/secreção
Camundongos
Camundongos Endogâmicos C57BL
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Chromium Compounds); 0 (Interleukin-1beta); 0 (NLR Family, Pyrin Domain-Containing 3 Protein); 0 (Nlrp3 protein, mouse); 0 (Reactive Oxygen Species); 8L70Q75FXE (Adenosine Triphosphate)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170728
[Lr] Data última revisão:
170728
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161019
[St] Status:MEDLINE



página 1 de 101 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde