Base de dados : MEDLINE
Pesquisa : H01.181.529.711 [Categoria DeCS]
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  1 / 21337 MEDLINE  
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[PMID]:29475304
[Au] Autor:Chacón A; Ruiz C
[Ti] Título:Attosecond delay in the molecular photoionization of asymmetric molecules.
[So] Source:Opt Express;26(4):4548-4562, 2018 Feb 19.
[Is] ISSN:1094-4087
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We report theoretical calculations of the delay in photoemission from CO with particular emphasis on the role of the ultrafast electronic bound dynamics. We study the delays in photoionization in the HOMO and HOMO-1 orbitals of the CO molecule by looking into the stereo Wigner time delay technique. That compares the delay in photoemission from electrons emitted to the left and right to extract structural and dynamical information of the ionization process. For this we apply two techniques: The attosecond streak camera and the time of flight technique. Although they should provide the same results we have found large discrepancies of up to 36 in the case of HOMO, while for the HOMO-1 we obtain the same results with the two techniques. We have found that the large time delays observed in the HOMO orbital with the streaking technique are a consequence of the resonant transition triggered by the streaking field. This resonant transition produces a bound electron wavepacket that modifies the measurements of delay in photoionization. As a result of this observation, our technique allows us to reconstruct the bound wavepacket dynamics induced by the streaking field. By measuring the expected value of the electron momentum along the polarization direction after the streaking field has finished, we can recover the relative phase between the complex amplitudes of the HOMO and LUMO orbitals. These theoretical calculations pave the way for the measurement of ultrafast bound-bound electron transitionsand its crucial role for the delay in photoemission observation.
[Mh] Termos MeSH primário: Monóxido de Carbono/química
Modelos Teóricos
Óptica e Fotônica
Fotoquímica
[Mh] Termos MeSH secundário: Luz
Teoria Quântica
Espalhamento de Radiação
Análise Espectral
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
7U1EE4V452 (Carbon Monoxide)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180302
[Lr] Data última revisão:
180302
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180225
[St] Status:MEDLINE
[do] DOI:10.1364/OE.26.004548


  2 / 21337 MEDLINE  
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[PMID]:29293664
[Au] Autor:Shi Y; Manco M; Moyal D; Huppert G; Araki H; Banks A; Joshi H; McKenzie R; Seewald A; Griffin G; Sen-Gupta E; Wright D; Bastien P; Valceschini F; Seité S; Wright JA; Ghaffari R; Rogers J; Balooch G; Pielak RM
[Ad] Endereço:L'Oréal Tech Incubator-California Research Center, San Francisco, California, United States of America.
[Ti] Título:Soft, stretchable, epidermal sensor with integrated electronics and photochemistry for measuring personal UV exposures.
[So] Source:PLoS One;13(1):e0190233, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Excessive ultraviolet (UV) radiation induces acute and chronic effects on the skin, eye and immune system. Personalized monitoring of UV radiation is thus paramount to measure the extent of personal sun exposure, which could vary with environment, lifestyle, and sunscreen use. Here, we demonstrate an ultralow modulus, stretchable, skin-mounted UV patch that measures personal UV doses. The patch contains functional layers of ultrathin stretchable electronics and a photosensitive patterned dye that reacts to UV radiation. Color changes in the photosensitive dyes correspond to UV radiation intensity and are analyzed with a smartphone camera. A software application has feature recognition, lighting condition correction, and quantification algorithms that detect and quantify changes in color. These color changes are then correlated with corresponding shifts in UV dose, and compared to existing UV dose risk levels. The soft mechanics of the UV patch allow for multi-day wear in the presence of sunscreen and water. Two evaluation studies serve to demonstrate the utility of the UV patch during daily activities with and without sunscreen application.
[Mh] Termos MeSH primário: Eletrônica
Epiderme/fisiologia
Fotoquímica
Raios Ultravioleta
[Mh] Termos MeSH secundário: Algoritmos
Corantes
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; VALIDATION STUDIES
[Nm] Nome de substância:
0 (Coloring Agents)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180206
[Lr] Data última revisão:
180206
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190233


  3 / 21337 MEDLINE  
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[PMID]:27778290
[Au] Autor:Yang Y; Fonovic M; Verhelst SH
[Ad] Endereço:Lehrstuhl für Chemie der Biopolymere, Technische Universität München, Weihenstephaner Berg 3, 85354, Freising, Germany.
[Ti] Título:Cleavable Linkers in Chemical Proteomics Applications.
[So] Source:Methods Mol Biol;1491:185-203, 2017.
[Is] ISSN:1940-6029
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The discovery of the protein targets of small molecule probes is a crucial aspect of activity-based protein profiling and chemical biology. Mass spectrometry is the primary method for target identification, and in the last decade, cleavable linkers have become a popular strategy to facilitate protein enrichment and identification. In this chapter, we provide an overview of cleavable linkers used in chemical proteomics approaches, discuss their different chemistries, and describe how they aid in protein identification.
[Mh] Termos MeSH primário: Proteínas/química
Proteômica
[Mh] Termos MeSH secundário: Sondas Moleculares
Fotoquímica
Proteólise
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Molecular Probes); 0 (Proteins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180116
[Lr] Data última revisão:
180116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161026
[St] Status:MEDLINE


  4 / 21337 MEDLINE  
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[PMID]:28860372
[Au] Autor:Scrutton NS
[Ad] Endereço:Manchester Institute of Biotechnology, Biotechnology and Biological Sciences Research Council/Engineering and Physical Sciences Research Council Centre for Synthetic Biology of Fine and Speciality Chemicals, School of Chemistry, University of Manchester, Manchester M1 7DN, UK. nigel.scrutton@manchester.ac.uk.
[Ti] Título:Enzymes make light work of hydrocarbon production.
[So] Source:Science;357(6354):872-873, 2017 09 01.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Hidrocarbonetos
Microalgas
Fotoquímica
[Mh] Termos MeSH secundário: Enzimas
Luz
[Pt] Tipo de publicação:JOURNAL ARTICLE; COMMENT
[Nm] Nome de substância:
0 (Enzymes); 0 (Hydrocarbons)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171025
[Lr] Data última revisão:
171025
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170902
[St] Status:MEDLINE
[do] DOI:10.1126/science.aao4399


  5 / 21337 MEDLINE  
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[PMID]:28805053
[Au] Autor:Sleiman M; de Sainte Claire P; Richard C
[Ad] Endereço:Equipe Photochimie CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand (ICCF) , 63178 Aubière, France.
[Ti] Título:Heterogeneous Photochemistry of Agrochemicals at the Leaf Surface: A Case Study of Plant Activator Acibenzolar-S-methyl.
[So] Source:J Agric Food Chem;65(35):7653-7660, 2017 Sep 06.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The photoreactivity of plant activator benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester (BTH), commonly named acibenzolar-S-methyl, was studied on the surfaces of glass, paraffinic wax films, and apple leaves. Experiments were carried out in a solar simulator using pure and formulated BTH (BION). Surface photoproducts were identified using liquid chromatography coupled with electrospray ionization and high-resolution Orbitrap mass spectrometry, while volatile photoproducts were characterized using an online thermal desorption system coupled to a gas chromatography-mass spectrometry (GC-MS) system. Pure BTH degraded quickly on wax surfaces with a half-life of 5.0 ± 0.5 h, whereas photolysis of formulated BTH was 7 times slower (t = 36 ± 14 h). On the other hand, formulated BTH was found to photolyze quickly on detached apple leaves with a half-life of 2.8 h ± 0.4 h. This drastic difference in photoreactivity was attributed to the nature and spreading of the BTH deposit, as influenced by the surfactant and surface characteristics. Abiotic stress of irradiated apple leaf was also shown to produce OH radicals which might contribute to the enhanced photodegradability. Eight surface photoproducts were identified, whereas GC-MS analyses revealed the formation of gaseous dimethyl disulfide and methanethiol. The yield of dimethyl disulfide ranged between 1.5% and 12%, and a significant fraction of dimethyl disulfide produced was found to be absorbed by the leaf. This is the first study to report on the formation of volatile chemicals and OH radicals during agrochemical photolysis on plant surfaces. The developed experimental approach can provide valuable insights into the heterogeneous photoreactivity of sprayed agrochemicals and could help improve dissipation models.
[Mh] Termos MeSH primário: Agroquímicos/química
Malus/efeitos dos fármacos
Folhas de Planta/efeitos da radiação
Tiadiazóis/química
[Mh] Termos MeSH secundário: Cromatografia Gasosa-Espectrometria de Massas
Malus/efeitos da radiação
Fotoquímica
Fotólise
Folhas de Planta/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Agrochemicals); 0 (Thiadiazoles); BCW6119347 (S-methyl benzo(1,2,3)thiadiazole-7-carbothioate)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170915
[Lr] Data última revisão:
170915
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170815
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b02622


  6 / 21337 MEDLINE  
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[PMID]:28738271
[Au] Autor:Ye J; Liu J; Li C; Zhou P; Wu S; Ou H
[Ad] Endereço:School of Environment, Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou 510632, China; Joint Genome Institute, Lawrence Berkeley National Laboratory, Walnut Creek 94598, CA, USA.
[Ti] Título:Heterogeneous photocatalysis of tris(2-chloroethyl) phosphate by UV/TiO : Degradation products and impacts on bacterial proteome.
[So] Source:Water Res;124:29-38, 2017 Nov 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The widespread, persistent and toxic organophosphorus esters (OPEs) have become one category of emerging environmental contaminants. Thus, it is in urgent need to develop a cost-effective and safe treatment technology for OPEs control. The current study is a comprehensive attempt to use UV/TiO heterogeneous photocatalysis for the degradation of a water dissolved OPEs, tris(2-chloroethyl) phosphate (TCEP). A pseudo-first order degradation reaction with a k of 0.3167 min was observed, while hydroxyl radical may be the dominating reactive oxidative species. As the reaction proceeded, TCEP was transformed to a series of hydroxylated and dechlorinated products. The degradation efficiency was significantly affected by pH value, natural organic matters and anions, implying that the complete mineralization of TCEP would be difficult to achieve in actual water treatment process. Based on the proteomics analysis regarding the metabolism reactions, pathways and networks, the significant activation of transmembrane transport and energy generation in Escherichia coli exposed to preliminary degrading products suggested that they can be transported and utilized through cellular metabolism. Furthermore, the descending trend of stress resistance exhibited that the toxicity of products was obviously weakened as the treatment proceeded. In conclusion, hydroxylation and dechlorination of TCEP with incomplete mineralization were likewise effective for its detoxification, indicating that UV/TiO will be an alternative treatment method for OPEs control.
[Mh] Termos MeSH primário: Organofosfatos/química
Proteoma
[Mh] Termos MeSH secundário: Bactérias/genética
Fosfatos
Fotoquímica
Titânio/química
Raios Ultravioleta
Purificação da Água
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Organophosphates); 0 (Phosphates); 0 (Proteome); 15FIX9V2JP (titanium dioxide); 32IVO568B0 (tris(chloroethyl)phosphate); D1JT611TNE (Titanium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171116
[Lr] Data última revisão:
171116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170725
[St] Status:MEDLINE


  7 / 21337 MEDLINE  
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[PMID]:28668367
[Au] Autor:Shuib NS; Makahleh A; Salhimi SM; Saad B
[Ad] Endereço:School of Chemical Sciences, Universiti Sains Malaysia, 11800, Pulau Pinang, Malaysia; Mycotoxin Analytical Centre, Chemistry Department, Penang Branch, Jalan Tull, 10450, Pulau Pinang, Malaysia. Electronic address: nor_shifa@yahoo.com.
[Ti] Título:Determination of aflatoxin M in milk and dairy products using high performance liquid chromatography-fluorescence with post column photochemical derivatization.
[So] Source:J Chromatogr A;1510:51-56, 2017 Aug 11.
[Is] ISSN:1873-3778
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:The determination of aflatoxin M in milk using high performance liquid chromatography with photochemical post-column derivatization and fluorescence detection is described. The samples were first extracted and clean-up using the immunoaffinity AFLATEST column originally targeted for aflatoxins B , B , G and G . The separation of aflatoxin M were performed using C18 Hypersil gold (150mm×4.6mm, 5µm) column at 40°C under isocratic elution. Fluorescence detector (FLD) was set at 360nm and 440nm as excitation and emission, respectively. The use of methanol to replace acetonitrile as the mobile phase resulted in ∼67% peak area enhancement of AFM . The limit of detection (LOD) and quantification (LOQ) of the analytical method after post-column derivatization without evaporation/reconstitution with mobile phase was 0.0085µgL and 0.025µgL respectively. However, LOD and LOQ improved to 0.002 and 0.004µgL respectively with the addition of evaporation/reconstitution step. The method was statistically validated, showing linear response (R >0.999), good recoveries (85.2-107.0%) and relative standard deviations (RSD) were found to be ≤7%. The proposed method was applied to determine AFM contamination in various types of milk and milk products. Only 2 samples were contaminated with aflatoxin M (10% incidence). However, the contamination level is below the Malaysian and European legislation limits.
[Mh] Termos MeSH primário: Aflatoxina M1/análise
Cromatografia Líquida de Alta Pressão
Laticínios/análise
Análise de Alimentos/métodos
Leite/química
[Mh] Termos MeSH secundário: Aflatoxina M1/isolamento & purificação
Animais
Fluorescência
Análise de Alimentos/instrumentação
Limite de Detecção
Fotoquímica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
6795-23-9 (Aflatoxin M1)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171017
[Lr] Data última revisão:
171017
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170703
[St] Status:MEDLINE


  8 / 21337 MEDLINE  
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[PMID]:28654327
[Au] Autor:Padmanabhan S; Jost M; Drennan CL; Elías-Arnanz M
[Ad] Endereço:Instituto de Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain; email: padhu@iqfr.csic.es.
[Ti] Título:A New Facet of Vitamin B : Gene Regulation by Cobalamin-Based Photoreceptors.
[So] Source:Annu Rev Biochem;86:485-514, 2017 Jun 20.
[Is] ISSN:1545-4509
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Living organisms sense and respond to light, a crucial environmental factor, using photoreceptors, which rely on bound chromophores such as retinal, flavins, or linear tetrapyrroles for light sensing. The discovery of photoreceptors that sense light using 5'-deoxyadenosylcobalamin, a form of vitamin B that is best known as an enzyme cofactor, has expanded the number of known photoreceptor families and unveiled a new biological role of this vitamin. The prototype of these B -dependent photoreceptors, the transcriptional repressor CarH, is widespread in bacteria and mediates light-dependent gene regulation in a photoprotective cellular response. CarH activity as a transcription factor relies on the modulation of its oligomeric state by 5'-deoxyadenosylcobalamin and light. This review surveys current knowledge about these B -dependent photoreceptors, their distribution and mode of action, and the structural and photochemical basis of how they orchestrate signal transduction and control gene expression.
[Mh] Termos MeSH primário: Proteínas de Bactérias/química
Cobamidas/metabolismo
Regulação Bacteriana da Expressão Gênica
Fotorreceptores Microbianos/química
Proteínas Repressoras/química
Fatores de Transcrição/química
[Mh] Termos MeSH secundário: Bacillus megaterium/genética
Bacillus megaterium/metabolismo
Bacillus megaterium/efeitos da radiação
Proteínas de Bactérias/genética
Proteínas de Bactérias/metabolismo
Cobamidas/química
Luz
Modelos Moleculares
Myxococcus xanthus/genética
Myxococcus xanthus/metabolismo
Myxococcus xanthus/efeitos da radiação
Fotoquímica
Fotorreceptores Microbianos/genética
Fotorreceptores Microbianos/metabolismo
Conformação Proteica
Proteínas Repressoras/genética
Proteínas Repressoras/metabolismo
Transdução de Sinais
Thermus thermophilus/genética
Thermus thermophilus/metabolismo
Thermus thermophilus/efeitos da radiação
Fatores de Transcrição/genética
Fatores de Transcrição/metabolismo
Transcrição Genética
Vitamina B 12/química
Vitamina B 12/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (Cobamides); 0 (Photoreceptors, Microbial); 0 (Repressor Proteins); 0 (Transcription Factors); F0R1QK73KB (cobamamide); P6YC3EG204 (Vitamin B 12)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170704
[Lr] Data última revisão:
170704
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170628
[St] Status:MEDLINE
[do] DOI:10.1146/annurev-biochem-061516-044500


  9 / 21337 MEDLINE  
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[PMID]:28628209
[Au] Autor:Meher G; Meher NK; Iyer RP
[Ad] Endereço:Spring Bank Pharmaceuticals, Inc., Milford, Massachusetts.
[Ti] Título:Nucleobase Protection of Deoxyribo- and Ribonucleosides.
[So] Source:Curr Protoc Nucleic Acid Chem;69:2.1.1-2.1.40, 2017 Jun 19.
[Is] ISSN:1934-9289
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Oligonucleotides carrying a variety of chemical modifications including conjugates are finding increasing applications in therapeutics, diagnostics, functional genomics, proteomics, and as research tools in chemical and molecular biology. The successful synthesis of oligonucleotides primarily depends on the use of appropriately protected nucleoside building blocks including the exocyclic amino groups of the nucleobases, the hydroxyl groups at the 2'-, 3'-, and 5'-positions of the sugar moieties, and the internucleotide phospho-linkage. This unit is a thoroughly revised update of the previously published version and describes the recent development of various protecting groups that facilitate reliable oligonucleotide synthesis. In addition, various protecting groups for the imide/lactam function of thymine/uracil and guanine, respectively, are described to prevent irreversible nucleobase modifications that may occur in the presence of reagents used in oligonucleotide synthesis. © 2017 by John Wiley & Sons, Inc.
[Mh] Termos MeSH primário: Desoxirribonucleosídeos/química
Ribonucleosídeos/química
[Mh] Termos MeSH secundário: Acetilação
Fotoquímica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Deoxyribonucleosides); 0 (Ribonucleosides)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170802
[Lr] Data última revisão:
170802
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170620
[St] Status:MEDLINE
[do] DOI:10.1002/cpnc.32


  10 / 21337 MEDLINE  
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[PMID]:28595123
[Au] Autor:Wu W; Shan G; Xiang Q; Zhang Y; Yi S; Zhu L
[Ad] Endereço:Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, PR China.
[Ti] Título:Effects of humic acids with different polarities on the photocatalytic activity of nano-TiO at environment relevant concentration.
[So] Source:Water Res;122:78-85, 2017 Oct 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Large volume production and application of nano-TiO make it inevitably release to natural waters and its environmental behaviors would be affected by natural organic matters. In this study, the mechanisms of humic acid (HA) affecting the photocatalytic performance of nano-TiO were elucidated by using three HA fractions from the same source but with different polarities. Bulk HA was fractionated on a silica gel column to get three fractions with polarity increasing in the order of FA, FB and FC. FA was fulvic acid-like while FB and FC were humic acid-like. All the three fractions (at 0.1 mg/L) promoted the generation of hydroxyl radicals (OHs) by nano-TiO , and thus in turn facilitated the photocatalytic degradation of bispheol A (BPA). FA and FC displayed a stronger promotion effect than FB and the bulk HA. Online in situ flow cell ATR-FTIR and XPS analyses indicated that HA fractions could form charge-transfer complex with nano-TiO surface through the phenolic hydroxyl and carboxylic groups, which favored the separation of photogenerated electron-hole pairs. Through step methylation experiments, it was verified that the phenolic hydroxyl and carboxylic groups of HA fractions played important roles in promoting the photocatalytic performance of nano-TiO , and the effect of carboxylic group was more significant than the phenolic hydroxyl group.
[Mh] Termos MeSH primário: Substâncias Húmicas
Titânio
[Mh] Termos MeSH secundário: Adsorção
Meio Ambiente
Nanopartículas
Fotoquímica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Humic Substances); 15FIX9V2JP (titanium dioxide); D1JT611TNE (Titanium)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171013
[Lr] Data última revisão:
171013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170609
[St] Status:MEDLINE



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