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  1 / 1894 MEDLINE  
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[PMID]:29340528
[Au] Autor:Hong C; Zhou X; Huang W; Shan P; Dong F
[Ad] Endereço:Department of Cardiology, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China.
[Ti] Título:Synthesis and anti-myocarditis activity in a multifunctional lanthanide microporous metal-organic framework with 1D helical chain building units.
[So] Source:Braz J Med Biol Res;51(3):e7050, 2018 Jan 11.
[Is] ISSN:1414-431X
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:A new microporous lanthanide metal-organic framework, {[Yb(BTB)(H2O) (DEF)2}n (1, DEF=N,N-Diethylformamide), with 1D nano-sized channels has been constructed by bridging helical chain secondary building units with 1,3,5-benzenetrisbenzoic acid (H3BTB) ligand. Structural characterization suggests that this complex crystallizes in the hexagonal space group P6122 and possesses 1D triangular channels with coordinated water molecules pointing to the channel center. In addition, anti-myocarditis properties of compound 1 were evaluated in vivo. The results showed that compound 1 can improve hemodynamic parameters of, and it may be a good therapeutic option for heart failure in the future.
[Mh] Termos MeSH primário: Anti-Inflamatórios/química
Cristalografia por Raios X
Elementos da Série dos Lantanídeos/química
Estruturas Metalorgânicas/química
Miocardite/terapia
[Mh] Termos MeSH secundário: Animais
Anti-Inflamatórios/uso terapêutico
Masculino
Estruturas Metalorgânicas/uso terapêutico
Camundongos
Modelos Moleculares
Difração de Pó
Termogravimetria
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Inflammatory Agents); 0 (Lanthanoid Series Elements); 0 (Metal-Organic Frameworks)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180301
[Lr] Data última revisão:
180301
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180118
[St] Status:MEDLINE


  2 / 1894 MEDLINE  
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[PMID]:28745755
[Au] Autor:Isabettini S; Massabni S; Hodzic A; Durovic D; Kohlbrecher J; Ishikawa T; Fischer P; Windhab EJ; Walde P; Kuster S
[Ad] Endereço:Laboratory of Food Process Engineering, ETH Zürich, Schmelzbergstrasse 7, 8092 Zürich, Switzerland. stephane.isabettini@hest.ethz.ch.
[Ti] Título:Molecular engineering of lanthanide ion chelating phospholipids generating assemblies with a switched magnetic susceptibility.
[So] Source:Phys Chem Chem Phys;19(31):20991-21002, 2017 Aug 09.
[Is] ISSN:1463-9084
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Lanthanide ion (Ln ) chelating amphiphiles are powerful molecules for tailoring the magnetic response of polymolecular assemblies. Mixtures of 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) and 1,2-dimyristoyl-sn-glycero-3-phospho-ethanolamine-diethylene triaminepentaacetate (DMPE-DTPA) complexed to Ln deliver highly magnetically responsive bicelles. Their magnetic properties are readily tuned by changing the bicellar size or the magnetic susceptibility Δχ of the bilayer lipids. The former technique is intrinsically bound to the region of the phase diagram guarantying the formation of bicelles. Methods aiming towards manipulating the Δχ of the bilayer are comparatively more robust, flexible and lacking. Herein, we synthesized a new Ln chelating phospholipid using glutamic acid as a backbone: DMPE-Glu-DTPA. The chelate polyhedron was specifically engineered to alter the Δχ, whilst remaining geometrically similar to DMPE-DTPA. Planar asymmetric assemblies hundreds of nanometers in size were achieved presenting unprecedented magnetic alignments. The DMPE-Glu-DTPA/Ln complex switched the Δχ, achieving perpendicular alignment of assemblies containing Dy and parallel alignment of those containing Tm . Moreover, samples with chelated Yb were more alignable than the Tm chelating counterparts. Such a possibility has never been demonstrated for planar Ln chelating polymolecular assemblies. The physico-chemical properties of these novel assemblies were further studied by monitoring the alignment behavior at different temperatures and by including 16 mol% of cholesterol (Chol-OH) in the phospholipid bilayer. The DMPE-Glu-DTPA/Ln complex and the resulting assemblies are promising candidates for applications in numerous fields including pharmaceutical technologies, structural characterization of membrane biomolecules by NMR spectroscopy, as contrasting agents for magnetic resonance imaging, and for the development of smart optical gels.
[Mh] Termos MeSH primário: Elementos da Série dos Lantanídeos/química
Fosfolipídeos/química
[Mh] Termos MeSH secundário: Colesterol/química
Microscopia Crioeletrônica
Dimiristoilfosfatidilcolina/química
Difusão Dinâmica da Luz
Ácido Glutâmico/química
Bicamadas Lipídicas/química
Espectroscopia de Ressonância Magnética
Magnetismo
Difração de Nêutrons
Ácido Pentético/química
Fosfatidiletanolaminas/química
Espalhamento a Baixo Ângulo
Temperatura Ambiente
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements); 0 (Lipid Bilayers); 0 (Phosphatidylethanolamines); 0 (Phospholipids); 3KX376GY7L (Glutamic Acid); 7A314HQM0I (Pentetic Acid); 97C5T2UQ7J (Cholesterol); U86ZGC74V5 (Dimyristoylphosphatidylcholine); Z37OX1ASNK (1,2-dimyristoylphosphatidylethanolamine)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180212
[Lr] Data última revisão:
180212
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170727
[St] Status:MEDLINE
[do] DOI:10.1039/c7cp03994h


  3 / 1894 MEDLINE  
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[PMID]:29236769
[Au] Autor:Carro-Temboury MR; Arppe R; Hempel C; Vosch T; Just Sørensen T
[Ad] Endereço:Nano-Science Center & Department of Chemistry, University of Copenhagen, Copenhagen, Denmark.
[Ti] Título:Creating infinite contrast in fluorescence microscopy by using lanthanide centered emission.
[So] Source:PLoS One;12(12):e0189529, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The popularity of fluorescence microscopy arises from the inherent mode of action, where the fluorescence emission from probes is used to visualize selected features on a presumed dark background. However, the background is rarely truly dark, and image processing and analysis is needed to enhance the fluorescent signal that is ascribed to the selected feature. The image acquisition is facilitated by using considerable illumination, bright probes at a relatively high concentration in order to make the fluorescent signal significantly more intense than the background signal. Here, we present two methods for completely removing the background signal in spectrally resolved fluorescence microscopy. The methodology is applicable for all probes with narrow and well-defined emission bands (Full width half-maximum < 20 nm). Here, we use two lanthanide based probes exploiting the narrow emission lines of europium(III) and terbium(III) ions. We used a model system with zeolites doped with lanthanides immobilized in a polymer stained with several fluorescent dyes regularly used in bioimaging. After smoothing the spectral data recorded in each pixel, they are differentiated. Method I is based on the direct sum of the gradient, while method II resolves the fluorescent signal by subtracting a background calculated via the gradient. Both methods improve signal-to-background ratio significantly and we suggest that spectral imaging of lanthanide-centered emission can be used as a tool to obtain absolute contrast in bioimaging.
[Mh] Termos MeSH primário: Elementos da Série dos Lantanídeos/química
Microscopia de Fluorescência/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180104
[Lr] Data última revisão:
180104
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171214
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189529


  4 / 1894 MEDLINE  
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[PMID]:27771862
[Au] Autor:Sala D; Giachetti A; Luchinat C; Rosato A
[Ad] Endereço:Magnetic Resonance Center (CERM), University of Florence, Via Luigi Sacconi 6, 50019, Sesto Fiorentino, Italy.
[Ti] Título:A protocol for the refinement of NMR structures using simultaneously pseudocontact shift restraints from multiple lanthanide ions.
[So] Source:J Biomol NMR;66(3):175-185, 2016 11.
[Is] ISSN:1573-5001
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The binding of paramagnetic metal ions to proteins produces a number of different effects on the NMR spectra of the system. In particular, when the magnetic susceptibility of the metal ion is anisotropic, pseudocontact shifts (PCSs) arise and can be easily measured. They constitute very useful restraints for the solution structure determination of metal-binding proteins. In this context, there has been great interest in the use of lanthanide(III) ions to induce PCSs in diamagnetic proteins, e.g. through the replacement native calcium(II) ions. By preparing multiple samples in each of which a different ion of the lanthanide series is introduced, it is possible to obtain multiple independent PCS datasets that can be used synergistically to generate protein structure ensembles (typically called bundles). For typical NMR-based determination of protein structure, it is necessary to perform an energetic refinement of such initial bundles to obtain final structures whose geometric quality is suitable for deposition in the PDB. This can be conveniently done by using restrained molecular dynamics simulations (rMD) in explicit solvent. However, there are no available protocols for rMD using multiple PCS datasets as part of the restraints. In this work, we extended the PCS module of the AMBER MD package to handle multiple datasets and tuned a previously developed protocol for NMR structure refinement to achieve consistent convergence with PCS restraints. Test calculations with real experimental data show that this new implementation delivers the expected improvement of protein geometry, resulting in final structures that are of suitable quality for deposition. Furthermore, we observe that also initial structures generated only with traditional restraints can be successfully refined using traditional and PCS restraints simultaneously.
[Mh] Termos MeSH primário: Íons/química
Elementos da Série dos Lantanídeos/química
Espectroscopia de Ressonância Magnética
Proteínas/química
[Mh] Termos MeSH secundário: Espectroscopia de Ressonância Magnética/métodos
Modelos Moleculares
Simulação de Dinâmica Molecular
Conformação Proteica
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ions); 0 (Lanthanoid Series Elements); 0 (Proteins)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171215
[Lr] Data última revisão:
171215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  5 / 1894 MEDLINE  
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[PMID]:28538150
[Au] Autor:Sárközi S; Komáromi I; Jóna I; Almássy J
[Ad] Endereço:Department of Physiology, Faculty of Medicine, Department of Laboratory Medicine, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
[Ti] Título:Lanthanides Report Calcium Sensor in the Vestibule of Ryanodine Receptor.
[So] Source:Biophys J;112(10):2127-2137, 2017 May 23.
[Is] ISSN:1542-0086
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Ca regulates ryanodine receptor's (RyR) activity through an activating and an inhibiting Ca -binding site located on the cytoplasmic side of the RyR channel. Their altered sensitivity plays an important role in the pathology of malignant hyperthermia and heart failure. We used lanthanide ions (Ln ) as probes to investigate the Ca sensors of RyR, because they specifically bind to Ca -binding proteins and they are impermeable to the channel. Eu 's and Sm 's action was tested on single RyR1 channels reconstituted into planar lipid bilayers. When the activating binding site was saturated by 50 µM Ca , Ln potently inhibited RyR's open probability (K Eu = 167 ± 5 nM and K Sm = 63 ± 3 nM), but in nominally 0 [Ca ], low [Eu ] activated the channel. These results suggest that Ln acts as an agonist of both Ca -binding sites. More importantly, the voltage-dependent characteristics of Ln 's action led to the conclusion that the activating Ca binding site is located within the electrical field of the channel (in the vestibule). This idea was tested by applying the pore blocker toxin maurocalcine on the cytoplasmic side of RyR. These experiments showed that RyR lost reactivity to changing cytosolic [Ca ] from 50 µM to 100 nM when the toxin occupied the vestibule. These results suggest that maurocalcine mechanically prevented Ca from dissociating from its binding site and support our vestibular Ca sensor-model further.
[Mh] Termos MeSH primário: Cálcio/metabolismo
Elementos da Série dos Lantanídeos/metabolismo
Canal de Liberação de Cálcio do Receptor de Rianodina/metabolismo
[Mh] Termos MeSH secundário: Animais
Sítios de Ligação
Cálcio/química
Agonistas dos Canais de Cálcio/química
Agonistas dos Canais de Cálcio/metabolismo
Agonistas dos Canais de Cálcio/farmacologia
Bloqueadores dos Canais de Cálcio/química
Bloqueadores dos Canais de Cálcio/farmacologia
Cátions/química
Cátions/metabolismo
Citosol/química
Citosol/metabolismo
Relação Dose-Resposta a Droga
Elementos da Série dos Lantanídeos/química
Bicamadas Lipídicas/química
Potenciais da Membrana/efeitos dos fármacos
Potenciais da Membrana/fisiologia
Microscopia Eletrônica
Microssomos/química
Microssomos/metabolismo
Modelos Moleculares
Coelhos
Canal de Liberação de Cálcio do Receptor de Rianodina/química
Retículo Sarcoplasmático/química
Retículo Sarcoplasmático/metabolismo
Venenos de Escorpião/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calcium Channel Agonists); 0 (Calcium Channel Blockers); 0 (Cations); 0 (Lanthanoid Series Elements); 0 (Lipid Bilayers); 0 (Ryanodine Receptor Calcium Release Channel); 0 (Scorpion Venoms); 0 (maurocalcine); SY7Q814VUP (Calcium)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170809
[Lr] Data última revisão:
170809
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170525
[St] Status:MEDLINE


  6 / 1894 MEDLINE  
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[PMID]:28511933
[Au] Autor:Lv K; Yang CT; Han J; Hu S; Wang XL
[Ad] Endereço:Radiochemistry Lab, Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, China.
[Ti] Título:An initial demonstration of hierarchically porous niobium alkylphosphonates coordination polymers as potent radioanalytical separation materials.
[So] Source:J Chromatogr A;1504:35-45, 2017 Jun 30.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Combining the merits of soft-templating and perchlorate oxidation methods, the first-case investigation of niobium alkylphosphonates has uncovered their unique morphology, backbone composition, thermal behavior and huge potentiality as radioanalytical separation materials. These hierarchically porous solids are random aggregates of densely stacked nanolayers perforated with worm-like holes or vesicular voids, manifesting the massif-, tower-like "polymer brush" elevated up to ∼150nm driven by the minimal surface free energy principle. These coordination polymers consist of distorted niobium (V) ions strongly linked with tetrahedral alkylphosphonate building units, exposing uncoordinated phosphonate moieties and defective metal sites. Despite the amorphous features, they demonstrate multimodal porosity covering continuous micropores, segregated mesopores and fractional macropores, beneficial for the sequestration by active Lewis acid-base center. Evidenced by the maximum distribution coefficients of thorium, lanthanides reaching 9.0×10 , 9.5×10 mLg and large separation factor at pH≤1 20-element cocktail, this category of niobium alkylphosphonates are capable of harvesting thorium, lanthanides directly from the radionuclide surrogate, comparable to or even surpass the performance of the metal (IV) arylphosphonates counterparts. They also display appreciable SF ∼20 in 1molL HNO , shedding light on dual approaches to achieve the isolation of americium from curium. A combinatorial radioanalytical separation protocol has been proposed to enrich thorium and europium, revealing facile utilization of these highly stable, phosphonated hybrids in sustainable development of radioanalytical separation.
[Mh] Termos MeSH primário: Nióbio/química
Polímeros/química
Tório/isolamento & purificação
[Mh] Termos MeSH secundário: Elementos da Série dos Lantanídeos/química
Elementos da Série dos Lantanídeos/isolamento & purificação
Ácidos de Lewis/química
Organofosfonatos/química
Porosidade
Tório/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements); 0 (Lewis Acids); 0 (Organophosphonates); 0 (Polymers); 05175J654G (Niobium); 60YU5MIG9W (Thorium)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171103
[Lr] Data última revisão:
171103
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170518
[St] Status:MEDLINE


  7 / 1894 MEDLINE  
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[PMID]:28485576
[Au] Autor:Wu Z; Lee MD; Carruthers TJ; Szabo M; Dennis ML; Swarbrick JD; Graham B; Otting G
[Ad] Endereço:Research School of Chemistry, Australian National University , Canberra, ACT 2601, Australia.
[Ti] Título:New Lanthanide Tag for the Generation of Pseudocontact Shifts in DNA by Site-Specific Ligation to a Phosphorothioate Group.
[So] Source:Bioconjug Chem;28(6):1741-1748, 2017 Jun 21.
[Is] ISSN:1520-4812
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Pseudocontact shifts (PCS) generated by paramagnetic lanthanides provide a rich source of long-range structural restraints that can readily be measured by nuclear magnetic resonance (NMR) spectroscopy. Many different lanthanide-binding tags have been designed for site-specific tagging of proteins, but established routes for tagging DNA with a single metal ion rely on difficult chemical synthesis. Here we present a simple and practical strategy for site-specific tagging of inexpensive phosphorothioate (PT) oligonucleotides. Commercially available PT oligonucleotides are diastereomers with S and R stereoconfiguration at the backbone PT site. The respective S and R diastereomers can readily be separated by HPLC. A new alkylating lanthanide-binding tag, C10, was synthesized that delivered quantitative tagging yields with both diastereomers. PCSs were observed following ligation with the complementary DNA strand to form double-stranded DNA duplexes. The PCSs were larger for the S than the R oligonucleotide and good correlation between back-calculated and experimental PCSs was observed. The C10 tag can also be attached to cysteine residues in proteins, where it generates a stable thioether bond. Ligated to the A28C mutant of ubiquitin, the tag produced excellent fits of magnetic susceptibility anisotropy (Δχ) tensors, with larger tensors than for the tagged PT oligonucleotides, indicating that the tag is not completely immobilized after ligation with a PT group.
[Mh] Termos MeSH primário: DNA/química
Elementos da Série dos Lantanídeos/química
Ressonância Magnética Nuclear Biomolecular/métodos
[Mh] Termos MeSH secundário: Sítios de Ligação
Oligonucleotídeos Fosforotioatos/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements); 0 (Phosphorothioate Oligonucleotides); 9007-49-2 (DNA)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170816
[Lr] Data última revisão:
170816
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170510
[St] Status:MEDLINE
[do] DOI:10.1021/acs.bioconjchem.7b00202


  8 / 1894 MEDLINE  
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[PMID]:28475837
[Au] Autor:Aceto M; Musso D; Calà E; Arieri F; Oddone M
[Ad] Endereço:Dipartimento di Scienze e Innovazione Tecnologica, Università degli Studi del Piemonte Orientale , Viale Teresa Michel 11, 15121 Alessandria, Italy.
[Ti] Título:Role of Lanthanides in the Traceability of the Milk Production Chain.
[So] Source:J Agric Food Chem;65(20):4200-4208, 2017 May 24.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The traceability and authentication of milk were studied using trace and ultratrace elements as chemical markers. Among these variables, the group of lanthanides resulted in being particularly useful for this purpose as a result of their homogeneous distribution inside milk, which showed on the contrary to be intrinsically inhomogeneous from the elemental point of view. Using in this pilot study milk samples from a factory in Piedmont (Italy), we demonstrated that the distribution of lanthanides can be used as a fingerprint to put into relation the soil of the pasture land on which cows graze and the bottled milk produced in the factory. In fact, the distribution is maintained nearly unaltered along the production chain of milk, apart from the passage into the stomachs of the cows. Using the same variables, it was possible to discriminate between milk produced in the factory and milk samples taken from the large-scale retail trade.
[Mh] Termos MeSH primário: Bovinos/metabolismo
Elementos da Série dos Lantanídeos/análise
Leite/química
[Mh] Termos MeSH secundário: Ração Animal/análise
Animais
Feminino
Itália
Lactação
Leite/metabolismo
Projetos Piloto
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170622
[Lr] Data última revisão:
170622
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170506
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b00916


  9 / 1894 MEDLINE  
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[PMID]:28408043
[Au] Autor:Ansari SA; Mohapatra PK
[Ad] Endereço:Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
[Ti] Título:A review on solid phase extraction of actinides and lanthanides with amide based extractants.
[So] Source:J Chromatogr A;1499:1-20, 2017 May 26.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Solid phase extraction is gaining attention from separation scientists due to its high chromatographic utility. Though both grafted and impregnated forms of solid phase extraction resins are popular, the later is easy to make by impregnating a given organic extractant on to an inert solid support. Solid phase extraction on an impregnated support, also known as extraction chromatography, combines the advantages of liquid-liquid extraction and the ion exchange chromatography methods. On the flip side, the impregnated extraction chromatographic resins are less stable against leaching out of the organic extractant from the pores of the support material. Grafted resins, on the other hand, have a higher stability, which allows their prolong use. The goal of this article is a brief literature review on reported actinide and lanthanide separation methods based on solid phase extractants of both the types, i.e., (i) ligand impregnation on the solid support or (ii) ligand functionalized polymers (chemically bonded resins). Though the literature survey reveals an enormous volume of studies on the extraction chromatographic separation of actinides and lanthanides using several extractants, the focus of the present article is limited to the work carried out with amide based ligands, viz. monoamides, diamides and diglycolamides. The emphasis will be on reported applied experimental results rather than on data pertaining fundamental metal complexation.
[Mh] Termos MeSH primário: Elementos da Série Actinoide/isolamento & purificação
Amidas/química
Elementos da Série dos Lantanídeos/isolamento & purificação
Extração em Fase Sólida
[Mh] Termos MeSH secundário: Ligantes
Polímeros/química
Extração em Fase Sólida/normas
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Actinoid Series Elements); 0 (Amides); 0 (Lanthanoid Series Elements); 0 (Ligands); 0 (Polymers)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170713
[Lr] Data última revisão:
170713
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170415
[St] Status:MEDLINE


  10 / 1894 MEDLINE  
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[PMID]:28379006
[Au] Autor:Harris SM; Nguyen JT; Pailloux SL; Mansergh JP; Dresel MJ; Swanholm TB; Gao T; Pierre VC
[Ad] Endereço:Department of Chemistry, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.
[Ti] Título:Gadolinium Complex for the Catch and Release of Phosphate from Water.
[So] Source:Environ Sci Technol;51(8):4549-4558, 2017 Apr 18.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The ability of complexes of hard and labile metal ions with one or more open coordination sites to capture phosphates with high affinity and selectivity directly in water at neutral pH and release them under acidic conditions is evaluated with Gadolinium- 2,2',2''-(((nitrilotris(ethane-2,1-diyl))tris(azanediyl))tris(carbonyl))tris(4-oxo-4H-pyran-3-olate) (Gd-TREN-MAM). This model lanthanide complex has two open coordination sites that, at neutral pH, are filled with water molecules. In water at neutral pH, Gd-TREN-MAM binds phosphate with high affinity (K = 1.3 × 10 ) via the formation of a ternary complex in which one phosphate replaces both inner-sphere water molecules. The formation of this complex is highly pH-dependent; the phosphate is completely released from Gd-TREN-MAM below pH 2. Because the Gd ion remains complexed by its ligand, even under strong acidic conditions, Gd-TREN-MAM can be used at least 10 times in a pH-based recycling scheme that enables the catch and release of one phosphate per cycle. Gd-TREN-MAM is highly selective for phosphate over other anions of environmental concerns, including HCO , HCO , CH CO , SO , NO , NO , BrO , AsO , F , Cl , and Br and, to a lesser extent, ClO . The development of such receptors that bind phosphate reversibly in a pH-dependent manner opens the possibility to design catch-and-release systems for the purification of surface waters.
[Mh] Termos MeSH primário: Gadolínio/química
Água/química
[Mh] Termos MeSH secundário: Elementos da Série dos Lantanídeos/química
Ligantes
Fosfatos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lanthanoid Series Elements); 0 (Ligands); 0 (Phosphates); 059QF0KO0R (Water); AU0V1LM3JT (Gadolinium)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170608
[Lr] Data última revisão:
170608
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170406
[St] Status:MEDLINE
[do] DOI:10.1021/acs.est.6b05815



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