Base de dados : MEDLINE
Pesquisa : D01.268.513.937 [Categoria DeCS]
Referências encontradas : 10398 [refinar]
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[PMID]:28462910
[Au] Autor:Mihailescu IN; Bociaga D; Popescu-Pelin G; Stan GE; Duta L; Socol G; Chifiriuc MC; Bleotu C; Lazar V; Husanu MA; Zgura I; Miculescu F; Negut I; Hapenciuc C
[Ad] Endereço:National Institute for Lasers, Plasma and Radiation Physics, 077125 Magurele, Romania.
[Ti] Título:Optimized silicon reinforcement of carbon coatings by pulsed laser technique for superior functional biomedical surfaces fabrication.
[So] Source:Biofabrication;9(2):025029, 2017 Jun 01.
[Is] ISSN:1758-5090
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:We report on the fabrication of silicon-reinforced carbon (C:Si) structures by combinatorial pulsed laser deposition to search for the best design for a new generation of multi-functional coated implants. The synthesized films were characterized from the morphological, structural, compositional, mechanical and microbiological points of view. Scanning electron microscopy revealed the presence, on top of the deposited layers, of spheroid particulates with sizes in the micron range. No micro-cracks or delaminations were observed. Energy dispersive x-ray spectroscopy and grazing incidence x-ray diffraction pointed to the existence of a C to Si compositional gradient from one end of the film to the other. Raman investigation revealed a relatively high sp hybridization of up to 80% at 40-48 mm apart from the edge with higher C content. Si addition was demonstrated to significantly increase C:Si film bonding to the substrate, with values above the ISO threshold for coatings to be used in high-loading biomedical applications. Surface energy studies pointed to an increase in the hydrophilic character of the deposited structures along with Si content up to 52 mN m . In certain cases, the Si-reinforced C coatings elicited an antimicrobial biofilm action. The presence of Si was proven to be benign to HEp-2 cells of human origin, without interfering with their cellular cycle. On this basis, reliable C:Si structures with good adherence to the substrate and high efficiency against microbial biofilms can be developed for implant coatings and other advanced medical devices.
[Mh] Termos MeSH primário: Tecnologia Biomédica/métodos
Carbono/química
Materiais Revestidos Biocompatíveis/química
Lasers
Silício/química
[Mh] Termos MeSH secundário: Ciclo Celular
Forma Celular
Seres Humanos
Teste de Materiais
Testes de Sensibilidade Microbiana
Microscopia Eletrônica de Varredura
Espectrometria por Raios X
Análise Espectral Raman
Propriedades de Superfície
Água/química
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coated Materials, Biocompatible); 059QF0KO0R (Water); 7440-44-0 (Carbon); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1088/1758-5090/aa7076


  2 / 10398 MEDLINE  
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[PMID]:28968941
[Au] Autor:Etesami H; Jeong BR
[Ad] Endereço:Department of Soil Science, Faculty of Agricultural Engineering and Technology, University College of Agriculture and Natural Resources, University of Tehran, 31587-77871 Iran. Electronic address: hassanetesami@ut.ac.ir.
[Ti] Título:Silicon (Si): Review and future prospects on the action mechanisms in alleviating biotic and abiotic stresses in plants.
[So] Source:Ecotoxicol Environ Saf;147:881-896, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In the era present, due to increasing incidences of a large number of different biotic and abiotic stresses all over the world, the growth of plants (principal crops) may be restrained by these stresses. In addition to beneficial microorganisms, use of silicon (Si)-fertilizer is known as an ecologically compatible and environmentally friendly technique to stimulate plant growth, alleviate various biotic and abiotic stresses in plants, and enhance the plant resistance to multiple stresses, because Si is not harmful, corrosive, and polluting to plants when presents in excess. Here, we reviewed the action mechanisms by which Si alleviates abiotic and biotic stresses in plants. The use of Si (mostly as industrial slags and rice straw) is predicted to become a sustainable strategy and an emerging trend in agriculture to enhance crop growth and alleviate abiotic and biotic stresses in the not too distant future. In this review article, the future research needs on the use of Si under the conditions of abiotic and biotic stresses are also highlighted.
[Mh] Termos MeSH primário: Produtos Agrícolas/efeitos dos fármacos
Fertilizantes
Desenvolvimento Vegetal/efeitos dos fármacos
Silício/farmacologia
Solo
Estresse Fisiológico/efeitos dos fármacos
[Mh] Termos MeSH secundário: Produtos Agrícolas/crescimento & desenvolvimento
Produtos Agrícolas/metabolismo
Secas
Salinidade
Solo/química
Solo/normas
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Fertilizers); 0 (Soil); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180308
[Lr] Data última revisão:
180308
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171004
[St] Status:MEDLINE


  3 / 10398 MEDLINE  
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[PMID]:28742061
[Au] Autor:Poppinga D; Halbur J; Lemmer S; Delfs B; Harder D; Looe HK; Poppe B
[Ad] Endereço:University Clinic for Medical Radiation Physics, Medical Campus Pius-Hospital, Carl von Ossietzky University, Oldenburg, Germany.
[Ti] Título:Test study of boron nitride as a new detector material for dosimetry in high-energy photon beams.
[So] Source:Phys Med Biol;62(18):N436-N444, 2017 Sep 05.
[Is] ISSN:1361-6560
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The aim of this test study is to check whether boron nitride (BN) might be applied as a detector material in high-energy photon-beam dosimetry. Boron nitride exists in various crystalline forms. Hexagonal boron nitride (h-BN) possesses high mobility of the electrons and holes as well as a high volume resistivity, so that ionizing radiation in the clinical range of the dose rate can be expected to produce a measurable electrical current at low background current. Due to the low atomic numbers of its constituents, its density (2.0 g cm ) similar to silicon and its commercial availability, h-BN appears as possibly suitable for the dosimetry of ionizing radiation. Five h-BN plates were contacted to triaxial cables, and the detector current was measured in a solid-state ionization chamber circuit at an applied voltage of 50 V. Basic dosimetric properties such as formation by pre-irradiation, sensitivity, reproducibility, linearity and temporal resolution were measured with 6 MV photon irradiation. Depth dose curves at quadratic field sizes of 10 cm and 40 cm were measured and compared to ionization chamber measurements. After a pre-irradiation with 6 Gy, the devices show a stable current signal at a given dose rate. The current-voltage characteristic up to 400 V shows an increase in the collection efficiency with the voltage. The time-resolved detector current behavior during beam interrupts is comparable to diamond material, and the background current is negligible. The measured percentage depth dose curves at 10 cm × 10 cm field size agreed with the results of ionization chamber measurements within ±2%. This is a first study of boron nitride as a detector material for high-energy photon radiation. By current measurements on solid ionization chambers made from boron nitride chips we could demonstrate that boron nitride is in principle suitable as a detector material for high-energy photon-beam dosimetry.
[Mh] Termos MeSH primário: Compostos de Boro/química
Teste de Materiais
Fótons/uso terapêutico
Radiometria/instrumentação
Radiometria/métodos
Radioterapia de Alta Energia/instrumentação
[Mh] Termos MeSH secundário: Diamante/química
Elétrons
Reprodutibilidade dos Testes
Silício/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Boron Compounds); 2U4T60A6YD (boron nitride); 7782-40-3 (Diamond); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180305
[Lr] Data última revisão:
180305
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170726
[St] Status:MEDLINE
[do] DOI:10.1088/1361-6560/aa81f7


  4 / 10398 MEDLINE  
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[PMID]:28452155
[Au] Autor:Ikeno T; Nagano T; Hanaoka K
[Ad] Endereço:Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
[Ti] Título:Silicon-substituted Xanthene Dyes and Their Unique Photophysical Properties for Fluorescent Probes.
[So] Source:Chem Asian J;12(13):1435-1446, 2017 Jul 04.
[Is] ISSN:1861-471X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Silicon-substituted xanthene dyes, with Si in place of the O atom at the xanthene 10-position, are practically useful as far-red to near-infrared fluorophores. Many fluorescent probes based on them have recently been reported. These fluorophores retain the advantages of typical xanthene dyes and also show unique properties suitable for applications such as multi-color and super-resolution imaging.
[Mh] Termos MeSH primário: Corantes Fluorescentes/química
Silício/química
Xantenos/química
[Mh] Termos MeSH secundário: Estrutura Molecular
Processos Fotoquímicos
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Fluorescent Dyes); 0 (Xanthenes); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE
[do] DOI:10.1002/asia.201700385


  5 / 10398 MEDLINE  
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[PMID]:29371457
[Au] Autor:Schreiber LR; Bluhm H
[Ad] Endereço:Jülich Aachen Research Alliance (JARA), Institute for Quantum Information, RWTH Aachen and Forschungszentrum Jülich, Germany. lars.schreiber@physik.rwth-aachen.de.
[Ti] Título:Toward a silicon-based quantum computer.
[So] Source:Science;359(6374):393-394, 2018 01 26.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Desenho de Equipamento
Silício
[Mh] Termos MeSH secundário: Computadores
Pontos Quânticos
[Pt] Tipo de publicação:JOURNAL ARTICLE; COMMENT
[Nm] Nome de substância:
Z4152N8IUI (Silicon)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180129
[Lr] Data última revisão:
180129
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180127
[St] Status:MEDLINE
[do] DOI:10.1126/science.aar6209


  6 / 10398 MEDLINE  
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[PMID]:27775855
[Au] Autor:Rahimi F; Mohammadnejad Arough J; Yaghoobi M; Davoodi H; Sepehri F; Amirabadizadeh M
[Ad] Endereço:Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran.
[Ti] Título:A novel approach for osteocalcin detection by competitive ELISA using porous silicon as a substrate.
[So] Source:Biotechnol Appl Biochem;64(6):871-878, 2017 Nov.
[Is] ISSN:1470-8744
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In this study, porous silicon (PSi) was utilized instead of prevalent polystyrene platforms, and its capability in biomolecule screening was examined. Here, two types of porous structure, macroporous silicon (Macro-PSi) and mesoporous silicon (Meso-PSi), were produced on silicon wafers by electrochemical etching using different electrolytes. Moreover, both kinds of fresh and oxidized PSi samples were investigated. Next, osteocalcin as a biomarker of the bone formation process was used as a model biomarker, and the colorimetric detection was performed by competitive enzyme-linked immunosorbent assay (ELISA). Both Macro-PSi and Meso-PSi substrates in the oxidized state, specifically the Meso-porous structure, were reported to have higher surface area to volume ratio, more capacitance of surface-antigen interaction, and more ability to capture antigen in comparison with the prevalent platforms. Moreover, the optical density signal of osteocalcin detected by the ELISA technique was notably higher than the common platforms. Based on the findings of this study, PSi can potentially be used in the ELISA to achieve better results and consequently more sensitivity. A further asset of incorporating such a nanometer structure in the ELISA technique is that the system response to analyte concentration could be maintained by consuming lower monoclonal antibody (or antigen) and consequently reduces the cost of the experiment.
[Mh] Termos MeSH primário: Ensaio de Imunoadsorção Enzimática
Osteocalcina/análise
Silício/química
[Mh] Termos MeSH secundário: Biomarcadores/análise
Tamanho da Partícula
Porosidade
Propriedades de Superfície
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biomarkers); 104982-03-8 (Osteocalcin); Z4152N8IUI (Silicon)
[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:161025
[St] Status:MEDLINE
[do] DOI:10.1002/bab.1541


  7 / 10398 MEDLINE  
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[PMID]:29236786
[Au] Autor:Xu X; Jia H; Lei Y; Jia C; Liu G; Chai J; Peng Y; Xie J
[Ad] Endereço:Engineering Research Center of Optical Instruments and Systems, Ministry of Education, Shanghai Key Laboratory of Modern Optical Systems, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai, China.
[Ti] Título:Theoretical proposal of a low-loss wide-bandwidth silicon photonic crystal fiber for supporting 30 orbital angular momentum modes.
[So] Source:PLoS One;12(12):e0189660, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We propose a novel four-ring hollow-core silicon photonic crystal fiber (PCF), and we systematically and theoretically investigate the properties of their vector modes. Our PCF can stably support 30 OAM states from the wavelength of 1.5 µm to 2.4 µm, with a large effective refractive index separation of above 1×10-4. The confinement loss is less than 1×10-9 dB/m at the wavelength of 1.55 µm, and the average confinement loss is less than 1×10-8 dB/m from the wavelength of 1.2 µm to 2.4 µm. Moreover, the curve of the dispersion tends to flatten as the wavelength increases. In addition, we comparably investigate PCFs with different hole spacing. This kind of fiber structure will be a potential candidate for high-capacity optical fiber communications and OAM sensing applications using fibers.
[Mh] Termos MeSH primário: Desenho de Equipamento
Modelos Teóricos
Fibras Ópticas
Silício/química
[Mh] Termos MeSH secundário: Tecnologia de Fibra Óptica
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
Z4152N8IUI (Silicon)
[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.0189660


  8 / 10398 MEDLINE  
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[PMID]:29065171
[Au] Autor:Ju S; Wang L; Zhang C; Yin T; Shao S
[Ad] Endereço:School of Environment and Spatial Informatics, China University of Mining & Technology, Xuzhou, Jiangsu, China.
[Ti] Título:Alleviatory effects of silicon on the foliar micromorphology and anatomy of rice (Oryza sativa L.) seedlings under simulated acid rain.
[So] Source:PLoS One;12(10):e0187021, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Silicon (Si) is a macroelement in plants. The biological effects and mitigation mechanisms of silicon under environmental stress have become hot topics. The main objectives of this study were to elucidate the roles of Si in alleviating the effects on the phenotype, micromorphology and anatomy of the leaves of rice seedlings under acid rain stress. The results indicated that the combined or single effects of Si and simulated acid rain (SAR) stress on rice roots depended on the concentration of Si and the intensity of the SAR stress. The combined or single effects of the moderate concentration of Si (2.0 mM) and light SAR (pH 4.0) enhanced the growth of the rice leaves and the development of the mesophyll cells, and the combined effects were stronger than those of the single treatments. The high concentration of Si (4.0 mM) and severe SAR (pH 3.0 or 2.0) exerted deleterious effects. The incorporation of Si (2.0 or 4.0 mM) into SAR at pH values of 3.0 or 2.0 promoted rice leaf growth, decreased necrosis spots, maintained the structure and function of the mesophyll cells, increased the epicuticular wax content and wart-like protuberance (WP) density, and improved the stomatal characteristics of the leaves of rice seedlings more than the SAR only treatments. The alleviatory effects observed with a moderate concentration of Si (2.0 mM) were better than the effects obtained with the high concentration of Si (4.0 mM). The alleviatory effects were due to the enhancement of the mechanical barriers in the leaf epidermis.
[Mh] Termos MeSH primário: Chuva Ácida
Oryza/crescimento & desenvolvimento
Folhas de Planta/metabolismo
Silício/metabolismo
[Mh] Termos MeSH secundário: Células do Mesofilo/metabolismo
Oryza/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acid Rain); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171113
[Lr] Data última revisão:
171113
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171025
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0187021


  9 / 10398 MEDLINE  
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[PMID]:29031439
[Au] Autor:Lian Z; Pan D; Wang W; Zhang D; Li G; Li H
[Ad] Endereço:Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, China. Electronic address: zichao.lian.52c@st.kyoto-u.ac.jp.
[Ti] Título:Photoelectrocatalytic reduction of CO to methanol over a photosystem II-enhanced Cu foam/Si-nanowire system.
[So] Source:J Environ Sci (China);60:108-113, 2017 Oct.
[Is] ISSN:1001-0742
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A solar-light double illumination photoelectrocatalytic cell (SLDIPEC) was fabricated for autonomous CO reduction and O evolution with the aid of photosystem II (PS-II, an efficient light-driven water-oxidized enzyme from nature) and utilized in a photoanode solution. The proposed SLPEC system was composed of Cu foam as the photoanode and p-Si nanowires (Si-NW) as the photocathode. Under solar irradiation, it exhibited a super-photoelectrocatalytic performance for CO conversion to methanol, with a high evolution rate (41.94mmol/hr), owing to fast electron transfer from PS-II to Cu foam. Electrons were subsequently trapped by Si-NW through an external circuit via bias voltage (0.5V), and a suitable conduction band potential of Si (-0.6eV) allowed CO to be easily reduced to CH OH at the photocathode. The constructed Z-scheme between Cu foam and Si-NW can allow the SLDIPEC system to reduce CO (8.03mmol/hr) in the absence of bias voltage. This approach makes full use of the energy band mismatch of the photoanode and photocathode to design a highly efficient device for solving environmental issues and producing clean energy.
[Mh] Termos MeSH primário: Dióxido de Carbono/química
Cobre/química
Metanol/química
Nanofios/química
Processos Fotoquímicos
Silício/química
[Mh] Termos MeSH secundário: Oxirredução
Complexo de Proteína do Fotossistema II
Energia Solar
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Photosystem II Protein Complex); 142M471B3J (Carbon Dioxide); 789U1901C5 (Copper); Y4S76JWI15 (Methanol); Z4152N8IUI (Silicon)
[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:171017
[St] Status:MEDLINE


  10 / 10398 MEDLINE  
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[PMID]:28982368
[Au] Autor:Liu YZ; Chen MS; Cheng CC; Chen SH; Chen JK
[Ad] Endereço:Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Rd, 106, Taipei, Taiwan, ROC.
[Ti] Título:Fabrication of device with poly(N-isopropylacrylamide)-b-ssDNA copolymer brush for resistivity study.
[So] Source:J Nanobiotechnology;15(1):68, 2017 Oct 05.
[Is] ISSN:1477-3155
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this study, we grafted bromo-terminated poly(N-isopropylacrylamide) (PNIPAAm) brushes onto thin gold films deposited on silicon, and then reacted with NaN to produce azido-terminated PNIPAAm brushes. A probe sequence of single-stranded DNA (ssDNA) with a 4-pentynoic acid succinimidyl ester unit was grafted onto the azido-terminated PNIPAAm brushes through a click reaction, resulting in the formation of block copolymer brushes. The PNIPAAm-b-ssDNA copolymer brushes formed supramolecular complexes stabilized by bio-multiple hydrogen bonds (BMHBs), which enhanced the proton transfer and thereby decreased the resistivity of the structures. In addition, the optimal operation window for DNA detection ranges from 0 to 0.2 M of NaCl concentration. Therefore, the specimens were prepared in the PBS solution at 150 mM NaCl concentration for target hybridization. The supramolecular complex state of the PNIPAAm-b-ssDNA copolymer brushes transformed into the phase-separated state after the hybridization with 0.5 ng/µL of its target DNA sequence owing to the competition between BMHBs and complementary hydrogen bonds. This phase transformation of the PNIPAAm and probe segments inhibited the proton transfer and significantly increased the resistivity at 25 °C. Moreover, there were no significant changes in the resistivity of the copolymer brushes after hybridization with the target sequence at 45 °C. These results indicated that the phase-separated state of the PNIPAAm-b-ssDNA copolymer brushes, which was generally occurred above the LCST, can be substantially generated after hybridization with its target DNA sequence. By performing the controlled experiments, in the same manner, using another sequence with lengths similar to that of the target sequence without complementarity. In addition, the sequences featuring various degrees of complementarity were exploited to verify the phase separation behavior inside the PNIPAAm-b-ssDNA copolymer thin film.
[Mh] Termos MeSH primário: Resinas Acrílicas/química
DNA de Cadeia Simples/química
Ouro/química
Nanoestruturas/química
[Mh] Termos MeSH secundário: DNA/análise
Impedância Elétrica
Ácidos Graxos Insaturados/química
Hibridização de Ácido Nucleico
Silício/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acrylic Resins); 0 (DNA, Single-Stranded); 0 (Fatty Acids, Unsaturated); 25189-55-3 (poly-N-isopropylacrylamide); 6089-09-4 (4-pentynoic acid); 7440-57-5 (Gold); 9007-49-2 (DNA); Z4152N8IUI (Silicon)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171108
[Lr] Data última revisão:
171108
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171007
[St] Status:MEDLINE
[do] DOI:10.1186/s12951-017-0303-4



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