Base de dados : MEDLINE
Pesquisa : D01.490 [Categoria DeCS]
Referências encontradas : 2186 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 219 ir para página                         

  1 / 2186 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29247935
[Au] Autor:Das N; Das A; Sarma KP; Kumar M
[Ad] Endereço:Department of Environmental Science, Tezpur University, Napaam 784028, Assam, India.
[Ti] Título:Provenance, prevalence and health perspective of co-occurrences of arsenic, fluoride and uranium in the aquifers of the Brahmaputra River floodplain.
[So] Source:Chemosphere;194:755-772, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The present work focuses on understanding the provenance, prevalence and health perspective of As and F along with possible co-occurrence of uranium (U) in the aquifers of the Brahmaputra floodplains (BFP), India. Groundwater (n = 164) and sediment samples (n = 5) were obtained from the upper, middle and lower BFP. Energy dispersive spectroscopy (EDX) revealed the presence of As, U and Fe in the sediment matrix. Regression analysis showed a weaker relationship between As and F co-occurrence. Hierarchical cluster analysis (HCA) and principal component analysis (PCA) suggested reductive dissolution of Fe (hydr)oxides responsible for As release in the BFP, especially in the upper and lower BFP. Bicarbonate appeared to compete with As oxyanions for adsorption on positively charged surfaces leading to As release. Arsenic desorption in presence of PO , F and HCO at elevated pH appeared greatest in the upper BFP, suggesting the highest potential for co-occurrence. Co-occurrence, were mainly in isolated aquifers of the upper BFP owing to desorption of adsorbed As and F from Fe (hydr)oxides at higher pH. Weathering and dissolution of clay minerals in the upper BFP, and competitive desorption in presence of HCO and PO in the middle and lower BFP, respectively, explain variabilities in F release. Amorphous Fe (hydr)oxides like ferrihydrite act as sinks of U. Concentrations of As and F will likely increase in the future as projected from the saturated levels of goethite and ferrihydrite. Hazard indices (HI) revealed that children (3-8 years) were at greater health risk than adults.
[Mh] Termos MeSH primário: Arsênico/análise
Fluoretos/análise
Água Subterrânea/química
Rios/química
Urânio/análise
Poluentes Químicos da Água/análise
[Mh] Termos MeSH secundário: Adsorção
Adulto
Criança
Pré-Escolar
Análise por Conglomerados
Compostos Férricos/análise
Seres Humanos
Índia
Compostos de Ferro/análise
Minerais/análise
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 0 (Iron Compounds); 0 (Minerals); 0 (Water Pollutants, Chemical); 1310-14-1 (goethite); 4OC371KSTK (Uranium); 87PZU03K0K (ferric oxyhydroxide); N712M78A8G (Arsenic); Q80VPU408O (Fluorides)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171217
[St] Status:MEDLINE


  2 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29188999
[Au] Autor:Song LC; Zhu L; Hu FQ; Wang YX
[Ad] Endereço:Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University , Tianjin 300071, China.
[Ti] Título:Studies on Chemical Reactivity and Electrocatalysis of Two Acylmethyl(hydroxymethyl)pyridine Ligand-Containing [Fe]-Hydrogenase Models (2-COCH -6-HOCH C H N)Fe(CO) L (L = η -SCOMe, η -2-SC H N).
[So] Source:Inorg Chem;56(24):15216-15230, 2017 Dec 18.
[Is] ISSN:1520-510X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:On the basis of preparation and characterization of [Fe]-H ase models (2-COCH -6-HOCH C H N)Fe(CO) L (A, L = η -SCOMe; B, L = η -2-SC H N), the chemical reactivities of A and B with various electrophilic and nucleophilic reagents have been investigated, systematically. Thus, when A reacted with 1 equiv of MeCOCl in the presence of Et N in MeCN to give the η -SCOMe-coordinated acylation product (2-COCH -6-MeCO CH C H N)Fe(CO) (η -SCOMe) (1), treatment of A with excess HBF ·Et O in MeCN gave the cationic MeCN-coordinated complex [(2-COCH -6-HOCH C H N)Fe(CO) (MeCN)](BF ) (2). In addition, when 2 was treated with 1 equiv of 2,6-(p-4-MeC H ) C H SK or PPh in CH Cl to give the thiophenolato- and PPh -substituted derivatives (2-COCH -6-HOCH C H N)Fe(CO) [2,6-(p-MeC H ) C H S] (3) and [(2-COCH -6-HOCH C H N)Fe(CO) (PPh )](BF ) (4), treatment of B with 1 equiv of PMe or P(OMe) in THF afforded the phosphine- and phosphite-substituted complexes (2-COCH -6-HOCH C H N)(η -2-SC H N)Fe(CO) L (5, L = PMe ; 6, L = P(OMe) ). Interestingly, in contrast to A, when B reacted with excess HBF ·Et O in MeCN to afford the BF adduct [2-COCH -6-HO(BF )CH C H N]Fe(CO) (η -2-SC H N) (7), reaction of B with 1 equiv of p-MeC H COCl in the presence of Et N in MeCN gave not only the expected 2-acylmethyl-6-p-toluoyloxomethylpyridine-containing complex (2-COCH -6-p-MeC H CO CH C H N)Fe(CO) (η -2-SC H N) (8), but also gave the unexpected 2-toluoyloxovinyl-6-toluoyloxomethylpyridine-containing complex (2-p-MeC H CO C H-6-p-MeC H CO CH C H N)Fe(CO) (η -2-SC H N) (9). While the possible pathways for the novel reactions leading to complexes 1, 2, and 7-9 are suggested, the structures of complexes B, 1-4, and 6-9 were unambiguously confirmed by X-ray crystallography. In addition, model complexes A and B have been found to be catalysts for proton reduction to H from TFA under CV conditions.
[Mh] Termos MeSH primário: Materiais Biomiméticos/química
Hidrogenase/química
Compostos de Ferro/química
Proteínas com Ferro-Enxofre/química
Piridinas/química
[Mh] Termos MeSH secundário: Catálise
Cristalografia por Raios X
Técnicas Eletroquímicas
Ligantes
Modelos Moleculares
Oxirredução
Prótons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iron Compounds); 0 (Iron-Sulfur Proteins); 0 (Ligands); 0 (Protons); 0 (Pyridines); 0 (acylmethyl(hydroxymethyl)pyridine); EC 1.12.- (iron hydrogenase); EC 1.12.7.2 (Hydrogenase)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE
[do] DOI:10.1021/acs.inorgchem.7b02582


  3 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28966030
[Au] Autor:Cui JL; Zhao YP; Li JS; Beiyuan JZ; Tsang DCW; Poon CS; Chan TS; Wang WX; Li XD
[Ad] Endereço:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
[Ti] Título:Speciation, mobilization, and bioaccessibility of arsenic in geogenic soil profile from Hong Kong.
[So] Source:Environ Pollut;232:375-384, 2018 Jan.
[Is] ISSN:1873-6424
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The behaviour of arsenic (As) from geogenic soil exposed to aerobic conditions is critical to predict the impact of As on the environment, which processes remain unresolved. The current study examined the depth profile of As in geologically derived subsoil cores from Hong Kong and investigated the mobilization, plant availability, and bioaccessibility of As in As-contaminated soil at different depths (0-45.8 m). Results indicated significant heterogeneity, with high levels of As in three layers of soil reaching up to 505 mg/kg at a depth of 5 m, 404 mg/kg at a depth of 15 m, and 1510 mg/kg at a depth of 27-32 m. Arsenic in porewater samples was <11.5 µg/L in the study site. X-ray absorption spectroscopy (XAS) indicated that main As species in soil was arsenate (As(V)), as adsorbed fraction to Fe oxides (41-69% on goethite and 0-8% on ferrihydrite) or the mineral form scorodite (30-57%). Sequential extraction procedure demonstrated that 0.5 ± 0.4% of As was exchangeable. Aerobic incubation experiments exhibited that a very small amount (0.14-0.48 mg/kg) of As was desorbed from the soil because of the stable As(V) complex structure on abundant Fe oxides (mainly goethite), where indigenous microbes partly (59 ± 18%) contributed to the release of As comparing with the sterilized control. Furthermore, no As toxicity in the soil was observed with the growth of ryegrass. The bioaccessibility of As was <27% in the surface soil using simplified bioaccessibility extraction test. Our systematic evaluation indicated that As in the geogenic soil profile from Hong Kong is relatively stable exposing to aerobic environment. Nevertheless, children and workers should avoid incidental contact with excavated soil, because high concentration of As was present in the digestive solution (<0.1-268 µg/L).
[Mh] Termos MeSH primário: Arsênico/análise
Monitoramento Ambiental
Poluentes do Solo/análise
[Mh] Termos MeSH secundário: Adsorção
Arsenicais
Criança
Poluição Ambiental/estatística & dados numéricos
Compostos Férricos
Hong Kong
Seres Humanos
Compostos de Ferro
Minerais
Óxidos
Solo/química
Espectroscopia por Absorção de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenicals); 0 (Ferric Compounds); 0 (Iron Compounds); 0 (Minerals); 0 (Oxides); 0 (Soil); 0 (Soil Pollutants); 0 (scorodite); 1310-14-1 (goethite); 87PZU03K0K (ferric oxyhydroxide); N712M78A8G (Arsenic)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180122
[Lr] Data última revisão:
180122
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171003
[St] Status:MEDLINE


  4 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28734957
[Au] Autor:Vithana CL; Sullivan LA; Shepherd T
[Ad] Endereço:Southern Cross GeoScience, Southern Cross University, Australia. Electronic address: chamindra.vithana@scu.edu.au.
[Ti] Título:Effect of schwertmannite and jarosite on the formation of hypoxic blackwater during inundation of grass material.
[So] Source:Water Res;124:1-10, 2017 Nov 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This study focused on understanding the effect of schwertmannite and jarosite, commonly found in floodplains containing acid sulfate soil materials, on the characteristics of the hypoxic blackwaters that can form when floodplain vegetation experiences prolonged inundation. The formation of these 'blackwaters' was simulated in the laboratory by inundating flood-intolerant pasture grass leaf material in both the presence of schwertmannite/jarosite (schwertmannite and jarosite treatments) minerals and their absence (control treatment) at 27.5 °C for 32 days. The presence of either schwertmannite or jarosite was able to decrease the concentrations of DOC, nutrients (e.g. NH and PO and the biological oxygen demand (BOD) in the incubating water compared to the control treatment. Being fresh and labile, the pasture grass material liberated DOC immediately following inundation with a concomitant decrease in dissolved O thereby resulting in anoxic and reducing conditions in the incubating water. With the onset of anoxic and reducing conditions, the biogeochemical cycling of DOC in schwertmannite and jarosite treatments might have proceeded via microbially mediated iron(III) and sulfate reduction and electron shuttling processes. Under anoxic, slightly acidic conditions, microbially mediated iron(III) reduction and subsequent dissolution of schwertmannite and jarosite were triggered by liberating Fe , SO and alkalinity to the incubating water. The resultant increase in pH led to SO reduction in schwertmannite, and the Fe catalysed transformation of both schwertmannite and jarosite to goethite. Schwertmannite almost completely transformed to goethite within two weeks of incubation. Iron(III) in goethite (formed from schwertmannie transformation) was also reduced and likely proceeded via direct microbial reduction or via electron shuttling using the humic acids in the incubating water derived from pasture grass. These findings are highly useful in managing the coastal low lying acid sulfate soils landscapes which are subject to frequent flooding during wet seasons.
[Mh] Termos MeSH primário: Compostos Férricos/química
Compostos de Ferro/química
Sulfatos/química
[Mh] Termos MeSH secundário: Oxirredução
Poaceae
Zonas Úmidas
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 0 (Iron Compounds); 0 (Sulfates); 0 (jarosite); 0 (schwertmannite)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170724
[St] Status:MEDLINE


  5 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28691796
[Au] Autor:Krumina L; Lyngsie G; Tunlid A; Persson P
[Ad] Endereço:Centre of Environmental and Climate Research, Lund University , SE-223 62, Lund, Sweden.
[Ti] Título:Oxidation of a Dimethoxyhydroquinone by Ferrihydrite and Goethite Nanoparticles: Iron Reduction versus Surface Catalysis.
[So] Source:Environ Sci Technol;51(16):9053-9061, 2017 Aug 15.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Hydroquinones are important mediators of electron transfer reactions in soils with a capability to reduce Fe(III) minerals and molecular oxygen, and thereby generating Fenton chemistry reagents. This study focused on 2,6-dimethoxy hydroquinone (2,6-DMHQ), an analogue to a common fungal metabolite, and its reaction with ferrihydrite and goethite under variable pH and oxygen concentrations. Combined wet-chemical and spectroscopic analyses showed that both minerals effectively oxidized 2,6-DMHQ in the presence of oxygen. Under anaerobic conditions the first-order oxidation rate constants decreased by one to several orders of magnitude depending on pH and mineral. Comparison between aerobic and anaerobic results showed that ferrihydrite promoted 2,6-DMHQ oxidation both via reductive dissolution and heterogeneous catalysis while goethite mainly caused catalytic oxidation. These results were in agreement with changes in the reduction potential (E ) of the Fe(III) oxide/Fe(II) redox couple as a function of dissolved Fe(II) where E of goethite was lower than ferrihydrite at any given Fe(II) concentration, which makes ferrihydrite more prone to reductive dissolution by the 2,6-DMBQ/2,6-DMHQ redox couple. This study showed that reactions between hydroquinones and iron oxides could produce favorable conditions for formation of reactive oxygen species, which are required for nonenzymatic Fenton-based decomposition of soil organic matter.
[Mh] Termos MeSH primário: Compostos Férricos
Compostos de Ferro
Minerais
Nanopartículas
[Mh] Termos MeSH secundário: Catálise
Ferro
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 0 (Iron Compounds); 0 (Minerals); 1310-14-1 (goethite); 87PZU03K0K (ferric oxyhydroxide); E1UOL152H7 (Iron)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170711
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.7b02292


  6 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28674560
[Au] Autor:Tounkara AA; Coulibaly AMS; Coulibaly N; Traoré B; Maïga MK
[Ad] Endereço:Service de Néphrologie et d'Hémodialyse du CHU du Point G, Bamako, Mali.
[Ti] Título:[Management of chronic hemodialysis patients with anemia: case study conducted in the Department of Nephrology and Hemodialysis at the University Hospital Point G in Mali].
[Ti] Título:Gestion de l'anémie des patients hémodialysés chroniques: cas du Service de Néphrologie et d'hémodialyse du CHU du Point G au Mali..
[So] Source:Pan Afr Med J;26:167, 2017.
[Is] ISSN:1937-8688
[Cp] País de publicação:Uganda
[La] Idioma:fre
[Ab] Resumo:INTRODUCTION: Anemia is a frequent complication of Chronic Kidney Disease CKD commonly found in chronic haemodialysis patients. Patients management is mainly based on erythropoietin administration and iron supplementation. This study aimed to evaluate the management of chronic hemodialysis patients with anemia in the Department of Nephrology and Hemodialysis at the University Hospital Point G in Mali. METHODS: We conducted a cross-sectional study from 1 to 31 August 2016. RESULTS: 63 patients out of a total of 174 participants were selected, 34 men and 29 women with a sex-ratio of 1.17 in favor of men. The average age of patients was 48,79 years ±11.59, the average duration of hemodialysis treatment time was 3,77years±2.6. Hospitalization rate for anemia in our dialysis patients was 84,12%. 92.1% of patients required blood transfusion, with an annual average of 5,81 blood bags ±5.91. 87.3% of cases required iron supplementation. Mean ferritin concentration and TSC were 1245 ng/ml±629,52 and 46,16%±19.12 respectively. Occasional administration of EPO doses not exceeding the 4000IU was reported by 79.4% of patients. The main difficulty in using EPO was its cost (74.6%). HCV infection was found in 60.1% of patients who were assessed. CONCLUSION: The management of chronic dialysis patients with anemia should be integrated into the framework of the national health policy.
[Mh] Termos MeSH primário: Anemia/terapia
Eritropoetina/administração & dosagem
Diálise Renal
Insuficiência Renal Crônica/terapia
[Mh] Termos MeSH secundário: Adolescente
Adulto
Idoso
Anemia/etiologia
Transfusão de Sangue
Estudos Transversais
Feminino
Ferritinas/sangue
Hematínicos/administração & dosagem
Hospitalização/estatística & dados numéricos
Hospitais Universitários
Seres Humanos
Compostos de Ferro/administração & dosagem
Masculino
Mali
Meia-Idade
Insuficiência Renal Crônica/complicações
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hematinics); 0 (Iron Compounds); 11096-26-7 (Erythropoietin); 9007-73-2 (Ferritins)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170717
[Lr] Data última revisão:
170717
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170705
[St] Status:MEDLINE
[do] DOI:10.11604/pamj.2017.26.167.10861


  7 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Registro de Ensaios Clínicos
Texto completo
[PMID]:28609534
[Au] Autor:Powers JM; Buchanan GR; Adix L; Zhang S; Gao A; McCavit TL
[Ad] Endereço:Division of Hematology and Oncology, Baylor College of Medicine, Houston, Texas2Department of Pediatrics, Baylor College of Medicine, Houston, Texas3Texas Children's Hospital, Houston.
[Ti] Título:Effect of Low-Dose Ferrous Sulfate vs Iron Polysaccharide Complex on Hemoglobin Concentration in Young Children With Nutritional Iron-Deficiency Anemia: A Randomized Clinical Trial.
[So] Source:JAMA;317(22):2297-2304, 2017 06 13.
[Is] ISSN:1538-3598
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Importance: Iron-deficiency anemia (IDA) affects millions of persons worldwide, and is associated with impaired neurodevelopment in infants and children. Ferrous sulfate is the most commonly prescribed oral iron despite iron polysaccharide complex possibly being better tolerated. Objective: To compare the effect of ferrous sulfate with iron polysaccharide complex on hemoglobin concentration in infants and children with nutritional IDA. Design, Setting, and Participants: Double-blind, superiority randomized clinical trial of infants and children aged 9 to 48 months with nutritional IDA (assessed by history and laboratory criteria) that was conducted in an outpatient hematology clinic at a US tertiary care hospital from September 2013 through November 2015; 12-week follow-up ended in January 2016. Interventions: Three mg/kg of elemental iron once daily as either ferrous sulfate drops or iron polysaccharide complex drops for 12 weeks. Main Outcomes and Measures: Primary outcome was change in hemoglobin over 12 weeks. Secondary outcomes included complete resolution of IDA (defined as hemoglobin concentration >11 g/dL, mean corpuscular volume >70 fL, reticulocyte hemoglobin equivalent >25 pg, serum ferritin level >15 ng/mL, and total iron-binding capacity <425 µg/dL at the 12-week visit), changes in serum ferritin level and total iron-binding capacity, adverse effects. Results: Of 80 randomized infants and children (median age, 22 months; 55% male; 61% Hispanic white; 40 per group), 59 completed the trial (28 [70%] in ferrous sulfate group; 31 [78%] in iron polysaccharide complex group). From baseline to 12 weeks, mean hemoglobin increased from 7.9 to 11.9 g/dL (ferrous sulfate group) vs 7.7 to 11.1 g/dL (iron complex group), a greater difference of 1.0 g/dL (95% CI, 0.4 to 1.6 g/dL; P < .001) with ferrous sulfate (based on a linear mixed model). Proportion with a complete resolution of IDA was higher in the ferrous sulfate group (29% vs 6%; P = .04). Median serum ferritin level increased from 3.0 to 15.6 ng/mL (ferrous sulfate) vs 2.0 to 7.5 ng/mL (iron complex) over 12 weeks, a greater difference of 10.2 ng/mL (95% CI, 6.2 to 14.1 ng/mL; P < .001) with ferrous sulfate. Mean total iron-binding capacity decreased from 501 to 389 µg/dL (ferrous sulfate) vs 506 to 417 µg/dL (iron complex) (a greater difference of -50 µg/dL [95% CI, -86 to -14 µg/dL] with ferrous sulfate; P < .001). There were more reports of diarrhea in the iron complex group than in the ferrous sulfate group (58% vs 35%, respectively; P = .04). Conclusions and Relevance: Among infants and children aged 9 to 48 months with nutritional iron-deficiency anemia, ferrous sulfate compared with iron polysaccharide complex resulted in a greater increase in hemoglobin concentration at 12 weeks. Once daily, low-dose ferrous sulfate should be considered for children with nutritional iron-deficiency anemia. Trial Registration: clinicaltrials.gov Identifier: NCT01904864.
[Mh] Termos MeSH primário: Anemia Ferropriva/sangue
Anemia Ferropriva/tratamento farmacológico
Transtornos da Nutrição Infantil/complicações
Compostos Ferrosos/farmacologia
Hemoglobina A/efeitos dos fármacos
Compostos de Ferro/farmacologia
Polissacarídeos/farmacologia
[Mh] Termos MeSH secundário: Anemia Ferropriva/etiologia
Pré-Escolar
Método Duplo-Cego
Feminino
Ferritinas/sangue
Compostos Ferrosos/administração & dosagem
Compostos Ferrosos/efeitos adversos
Hemoglobina A/metabolismo
Seres Humanos
Lactente
Ferro/metabolismo
Compostos de Ferro/administração & dosagem
Compostos de Ferro/efeitos adversos
Perda de Seguimento
Masculino
Adesão à Medicação/estatística & dados numéricos
Polissacarídeos/administração & dosagem
Polissacarídeos/efeitos adversos
Resultado do Tratamento
[Pt] Tipo de publicação:JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL
[Nm] Nome de substância:
0 (Ferrous Compounds); 0 (Iron Compounds); 0 (Polysaccharides); 39R4TAN1VT (ferrous sulfate); 9007-73-2 (Ferritins); 9034-51-9 (Hemoglobin A); E1UOL152H7 (Iron)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171011
[Lr] Data última revisão:
171011
[Sb] Subgrupo de revista:AIM; IM
[Da] Data de entrada para processamento:170614
[Cl] Clinical Trial:ClinicalTrial
[St] Status:MEDLINE
[do] DOI:10.1001/jama.2017.6846


  8 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28582427
[Au] Autor:Frese M; Gloy G; Oberprieler RG; Gore DB
[Ad] Endereço:Faculty of Education, Science, Technology and Mathematics, and Institute of Applied Ecology, University of Canberra, Bruce (Canberra), ACT, Australia.
[Ti] Título:Imaging of Jurassic fossils from the Talbragar Fish Bed using fluorescence, photoluminescence, and elemental and mineralogical mapping.
[So] Source:PLoS One;12(6):e0179029, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The Talbragar Fish Bed is one of Australia's most important Jurassic deposits for freshwater fishes, land plants and aquatic and terrestrial insects. The site has yielded many well preserved fossils, which has led to the formal description of numerous new species and higher taxa. The excellent preservation of many fossils has allowed detailed anatomical studies, e.g. of the early teleost fish Cavenderichthys talbragarensis (Woodward, 1895). Here we report on the fluorescent characteristics and mineral composition of a range of Talbragar fossils. Most specimens fluoresce under ultraviolet, blue and green light. Elemental and mineralogical analyses revealed that the Talbragar fossils consist predominantly of quartz (SiO2), a mineral that is likely to account for the observed fluorescence, with trace kaolinite (Al2Si2O5(OH)4) in some of the fish fossils. Rock matrices are predominantly composed of quartz and goethite (FeO(OH)). Closer inspection of a plant leaf (Pentoxylon australicum White, 1981) establishes fluorescence as a useful tool for the visualisation of anatomical details that are difficult to see under normal light conditions.
[Mh] Termos MeSH primário: Peixes/anatomia & histologia
Fósseis
Insetos/anatomia & histologia
Folhas de Planta/anatomia & histologia
Plantas/anatomia & histologia
[Mh] Termos MeSH secundário: Animais
Austrália
Evolução Biológica
História Antiga
Insetos/química
Compostos de Ferro/análise
Compostos de Ferro/química
Compostos de Ferro/história
Caulim/análise
Caulim/química
Caulim/história
Medições Luminescentes
Metais Pesados/análise
Metais Pesados/química
Metais Pesados/história
Minerais/análise
Minerais/química
Minerais/história
Folhas de Planta/química
Plantas/química
Quartzo/análise
Quartzo/química
Quartzo/história
Espectrometria de Fluorescência
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iron Compounds); 0 (Metals, Heavy); 0 (Minerals); 1310-14-1 (goethite); 14808-60-7 (Quartz); 24H4NWX5CO (Kaolin)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170606
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0179029


  9 / 2186 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28570775
[Au] Autor:Qin DD; He CH; Li Y; Trammel AC; Gu J; Chen J; Yan Y; Shan DL; Wang QH; Quan JJ; Tao CL; Lu XQ
[Ad] Endereço:Key Lab of Bioelectrochemistry and Environmental Analysis of Gansu, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, P. R. China.
[Ti] Título:Fe PO -Encapsulated Reverse Energetic ZnO/Fe O Heterojunction Nanowire for Enhanced Photoelectrochemical Oxidation of Water.
[So] Source:ChemSusChem;10(13):2796-2804, 2017 Jul 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Zinc oxide is regarded as a promising candidate for application in photoelectrochemical water oxidation due to its higher electron mobility. However, its instability under alkaline conditions limits its application in a practical setting. Herein, we demonstrate an easily achieved wet-chemical route to chemically stabilize ZnO nanowires (NWs) by protecting them with a thin layer Fe O shell. This shell, in which the thickness can be tuned by varying reaction times, forms an intact interface with ZnO NWs, thus protecting ZnO from corrosion in a basic solution. The reverse energetic heterojunction nanowires are subsequently activated by introducing an amorphous iron phosphate, which substantially suppressed surface recombination as a passivation layer and improved photoelectrochemical performance as a potential catalyst. Compared with pure ZnO NWs (0.4 mA cm ), a maximal photocurrent of 1.0 mA cm is achieved with ZnO/Fe O core-shell NWs and 2.3 mA cm was achieved for the PH -treated NWs at 1.23 V versus RHE. The PH low-temperature treatment creates a dual function, passivation and catalyst layer (Fe PO ), examined by X-ray photoelectron spectroscopy, TEM, photoelectrochemical characterization, and impedance measurements. Such a nano-composition design offers great promise to improve the overall performance of the photoanode material.
[Mh] Termos MeSH primário: Compostos de Ferro/química
Nanofios/química
Fosfatos/química
Processos Fotoquímicos
Água/química
Óxido de Zinco/química
[Mh] Termos MeSH secundário: Cápsulas
Catálise
Eletroquímica
Oxirredução
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Capsules); 0 (Iron Compounds); 0 (Phosphates); 059QF0KO0R (Water); SOI2LOH54Z (Zinc Oxide)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170808
[Lr] Data última revisão:
170808
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170602
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700501


  10 / 2186 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28544652
[Au] Autor:Tsuji E; Motohashi T; Noda H; Kowalski D; Aoki Y; Tanida H; Niikura J; Koyama Y; Mori M; Arai H; Ioroi T; Fujiwara N; Uchimoto Y; Ogumi Z; Habazaki H
[Ad] Endereço:Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan.
[Ti] Título:Brownmillerite-type Ca FeCoO as a Practicable Oxygen Evolution Reaction Catalyst.
[So] Source:ChemSusChem;10(14):2864-2868, 2017 Jul 21.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Here, we report remarkable oxygen evolution reaction (OER) catalytic activity of brownmillerite (BM)-type Ca FeCoO . The OER activity of this oxide is comparable to or beyond those of the state-of-the-art perovskite (PV)-catalyst Ba Sr Co Fe O (BSCF) and a precious-metal catalyst RuO , emphasizing the importance of the characteristic BM structure with multiple coordination environments of transition metal (TM) species. Also, Ca FeCoO is clearly advantageous in terms of expense/laboriousness of the material synthesis. These facts make this oxide a promising OER catalyst used in many energy conversion technologies such as metal-air secondary batteries and hydrogen production from electrochemical/photocatalytic water splitting.
[Mh] Termos MeSH primário: Cobalto/química
Compostos de Ferro/química
Óxidos/química
Oxigênio/química
[Mh] Termos MeSH secundário: Catálise
Modelos Moleculares
Conformação Molecular
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iron Compounds); 0 (Oxides); 3G0H8C9362 (Cobalt); S88TT14065 (Oxygen)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170818
[Lr] Data última revisão:
170818
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170526
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700499



página 1 de 219 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