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  1 / 31113 MEDLINE  
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[PMID]:29231002
[Au] Autor:Xia ZY; Zhai XD; Liu BB; Zheng Z; Zhao LL; Mo YN
[Ad] Endereço:School of Forensic Medicine, Henan University of Science and Technology, Luoyang 471003, China.
[Ti] Título:[Relationship between Electrical Conductivity and Decomposition Rate of Rat Postmortem Skeletal Muscle].
[So] Source:Fa Yi Xue Za Zhi;33(1):17-20, 2017 Feb.
[Is] ISSN:1004-5619
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:OBJECTIVES: To analyze the relationship among electrical conductivity (EC), total volatile basic nitrogen (TVB-N), which is an index of decomposition rate for meat production, and postmortem interval (PMI). To explore the feasibility of EC as an index of cadaveric skeletal muscle decomposition rate and lay the foundation for PMI estimation. METHODS: Healthy Sprague-Dawley rats were sacrificed by cervical vertebrae dislocation and kept at 28 ℃. Muscle of rear limbs was removed at different PMI, homogenized in deionized water and then skeletal extraction liquid of mass concentration 0.1 g/mL was prepared. EC and TVB-N of extraction liquid were separately determined. The correlation between EC ( 1) and TVB-N ( 2) was analyzed, and their regression function was established. The relationship between PMI ( ) and these two parameters were studied, and their regression functions were separately established. RESULTS: The change trends of EC and TVB-N of skeletal extraction liquid at different PMI were almost the same, and there was a linear positive correlation between them. The regression equation was 2=0.14 1-164.91( ²=0.982). EC and TVB-N of skeletal muscle changed significantly with PMI, and the regression functions were =19.38 1³-370.68 1²+2 526.03 1-717.06( ²=0.994), and =2.56 2³-48.39 2²+330.60 2-255.04( ²=0.997), respectively. CONCLUSIONS: EC and TVB-N of rat postmortem skeletal muscle show similar change trends, which can be used as an index for decomposition rate of cadaveric skeletal muscle and provide a method for further study of late PMI estimation.
[Mh] Termos MeSH primário: Condutividade Elétrica
Patologia Legal
Músculo Esquelético/patologia
Mudanças Depois da Morte
[Mh] Termos MeSH secundário: Animais
Autopsia
Nitrogênio
Ratos
Ratos Sprague-Dawley
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
N762921K75 (Nitrogen)
[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:171213
[St] Status:MEDLINE
[do] DOI:10.3969/j.issn.1004-5619.2017.01.004


  2 / 31113 MEDLINE  
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[PMID]:28608484
[Au] Autor:Mendes R; Schimmer O; Vieira H; Pereira J; Teixeira B
[Ad] Endereço:Portuguese Institute for the Sea and Atmosphere (IPMA), Department for the Sea and Marine Resources, Lisbon, Portugal.
[Ti] Título:Control of abusive water addition to Octopus vulgaris with non-destructive methods.
[So] Source:J Sci Food Agric;98(1):369-376, 2018 Jan.
[Is] ISSN:1097-0010
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Abusive water addition to octopus has evidenced the need for quick non-destructive methods for product qualification in the industry and control of fresh commercial products in markets. Electric conductivity (EC)/pH and dielectric property measurements were selected to detect water uptake in octopus. RESULTS: A significant EC decrease was determined after soaking octopus in freshwater for 4 h. EC reflected the water uptake of octopus and the correspondent concentration decrease of available ions in the interstitial fluid. Significant correlations were determined between octopus water uptake, EC (R = -0.940) and moisture/protein (M/P) ratio (R = 0.923) changes. Seasonal and spatial variation in proximate composition did not introduce any uncertainty in EC discrimination of freshwater tampering. Immersion in 5 g L sodium tripolyphosphate (STPP) increased EC to a value similar to control octopus. EC false negatives resulting from the use of additives (STPP and citric acid) were eliminated with the additional determination of pH. Octopus soaked in freshwater, STPP and citric acid can also be clearly discriminated from untreated samples (control) and also from frozen (thawed) ones using the dielectric properties. No significant differences in the dielectric property scores were found between octopus sizes or geographical locations. CONCLUSION: Simultaneous EC/pH or dielectric property measurements can be used in a handheld device for non-destructive water addition detection in octopus. M/P ratio can be used as a reference destructive method. © 2017 Society of Chemical Industry.
[Mh] Termos MeSH primário: Octopodiformes/metabolismo
Água/metabolismo
[Mh] Termos MeSH secundário: Animais
Condutividade Elétrica
Concentração de Íons de Hidrogênio
Octopodiformes/química
Água/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
059QF0KO0R (Water)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:180306
[Lr] Data última revisão:
180306
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170614
[St] Status:MEDLINE
[do] DOI:10.1002/jsfa.8480


  3 / 31113 MEDLINE  
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[PMID]:29358641
[Au] Autor:Qian Y; Zhao X; Han Q; Chen W; Li H; Yuan W
[Ad] Endereço:School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, 200240, China.
[Ti] Título:An integrated multi-layer 3D-fabrication of PDA/RGD coated graphene loaded PCL nanoscaffold for peripheral nerve restoration.
[So] Source:Nat Commun;9(1):323, 2018 01 22.
[Is] ISSN:2041-1723
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:As a conductive nanomaterial, graphene has huge potentials in nerve function restoration by promoting electrical signal transduction and metabolic activities with unique topological properties. Polydopamine (PDA) and arginylglycylaspartic acid (RGD) can improve cell adhesion in tissue engineering. Here we report an integrated 3D printing and layer-by-layer casting (LBLC) method in multi-layered porous scaffold fabrication. The scaffold is composed of single-layered graphene (SG) or multi-layered graphene (MG) and polycaprolactone (PCL). The electrically conductive 3D graphene scaffold can significantly improve neural expression both in vitro and in vivo. It promotes successful axonal regrowth and remyelination after peripheral nerve injury. These findings implicate that graphene-based nanotechnology have great potentials in peripheral nerve restoration in preclinical and clinical application.
[Mh] Termos MeSH primário: Materiais Biocompatíveis/química
Grafite/química
Indóis/química
Regeneração Nervosa/efeitos dos fármacos
Oligopeptídeos/química
Polímeros/química
Engenharia Tecidual/métodos
Tecidos Suporte
[Mh] Termos MeSH secundário: Animais
Materiais Biocompatíveis/farmacologia
Adesão Celular/efeitos dos fármacos
Condutividade Elétrica
Grafite/farmacologia
Indóis/farmacologia
Masculino
Teste de Materiais
Nanotecnologia/métodos
Regeneração Nervosa/fisiologia
Oligopeptídeos/farmacologia
Traumatismos dos Nervos Periféricos/patologia
Traumatismos dos Nervos Periféricos/fisiopatologia
Traumatismos dos Nervos Periféricos/reabilitação
Poliésteres/química
Poliésteres/farmacologia
Polímeros/farmacologia
Porosidade
Cultura Primária de Células
Impressão Tridimensional
Ratos
Ratos Sprague-Dawley
Células de Schwann/citologia
Células de Schwann/efeitos dos fármacos
Células de Schwann/fisiologia
Nervo Isquiático/efeitos dos fármacos
Nervo Isquiático/lesões
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Biocompatible Materials); 0 (Indoles); 0 (Oligopeptides); 0 (Polyesters); 0 (Polymers); 0 (polydopamine); 24980-41-4 (polycaprolactone); 7782-42-5 (Graphite); 78VO7F77PN (arginyl-glycyl-aspartic acid)
[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:180124
[St] Status:MEDLINE
[do] DOI:10.1038/s41467-017-02598-7


  4 / 31113 MEDLINE  
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[PMID]:28467380
[Au] Autor:Lin A; Truong B; Patel S; Kaushik N; Choi EH; Fridman G; Fridman A; Miller V
[Ad] Endereço:C. & J. Nyheim Plasma Institute, Drexel University, Philadelphia, PA 19104, USA. agl46@glink.drexel.edu.
[Ti] Título:Nanosecond-Pulsed DBD Plasma-Generated Reactive Oxygen Species Trigger Immunogenic Cell Death in A549 Lung Carcinoma Cells through Intracellular Oxidative Stress.
[So] Source:Int J Mol Sci;18(5), 2017 May 03.
[Is] ISSN:1422-0067
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:A novel application for non-thermal plasma is the induction of immunogenic cancer cell death for cancer immunotherapy. Cells undergoing immunogenic death emit danger signals which facilitate anti-tumor immune responses. Although pathways leading to immunogenic cell death are not fully understood; oxidative stress is considered to be part of the underlying mechanism. Here; we studied the interaction between dielectric barrier discharge plasma and cancer cells for oxidative stress-mediated immunogenic cell death. We assessed changes to the intracellular oxidative environment after plasma treatment and correlated it to emission of two danger signals: surface-exposed calreticulin and secreted adenosine triphosphate. Plasma-generated reactive oxygen and charged species were recognized as the major effectors of immunogenic cell death. Chemical attenuators of intracellular reactive oxygen species successfully abrogated oxidative stress following plasma treatment and modulated the emission of surface-exposed calreticulin. Secreted danger signals from cells undergoing immunogenic death enhanced the anti-tumor activity of macrophages. This study demonstrated that plasma triggers immunogenic cell death through oxidative stress pathways and highlights its potential development for cancer immunotherapy.
[Mh] Termos MeSH primário: Apoptose/imunologia
Imunoterapia/métodos
Neoplasias/terapia
Estresse Oxidativo/imunologia
Gases em Plasma/uso terapêutico
Espécies Reativas de Oxigênio/imunologia
[Mh] Termos MeSH secundário: Células A549
Trifosfato de Adenosina/metabolismo
Análise de Variância
Células Apresentadoras de Antígenos/metabolismo
Calreticulina/metabolismo
Condutividade Elétrica
Eletrodos
Seres Humanos
Imunidade
Quartzo/química
Espécies Reativas de Oxigênio/metabolismo
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Calreticulin); 0 (Plasma Gases); 0 (Reactive Oxygen Species); 0 (calreticulin, human); 14808-60-7 (Quartz); 8L70Q75FXE (Adenosine Triphosphate)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170504
[St] Status:MEDLINE


  5 / 31113 MEDLINE  
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[PMID]:29178993
[Au] Autor:Boomi P; Anandha Raj J; Palaniappan SP; Poorani G; Selvam S; Gurumallesh Prabu H; Manisankar P; Jeyakanthan J; Langeswaran VK
[Ad] Endereço:Department of Bioinformatics, Alagappa University, Karaikudi, Tamil Nadu, India. Electronic address: pboomibioinformatics2015@gmail.com.
[Ti] Título:Improved conductivity and antibacterial activity of poly(2-aminothiophenol)-silver nanocomposite against human pathogens.
[So] Source:J Photochem Photobiol B;178:323-329, 2018 Jan.
[Is] ISSN:1873-2682
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:A rapid and simple chemical synthesis of poly(2-aminothiophenol)­silver (P2ATP-Ag) nanocomposite using conductive and electroactive silver nanoparticles (AgNPs) is reported. The AgNPs was synthesized by chemical reduction method using tri­sodium citrate as reducing agent and poly(N-vinyl-2-pyrrolidone) (PVP) as stabilizing agent. P2ATP-Ag nanocomposite was synthesized by using potassium peroxodisulphate as oxidant and the samples were characterized. The presence of AgNPs in the composite was confirmed from UV-Vis, FTIR and X-ray diffraction studies. Morphology of the P2ATP and its composite were investigated by SEM. HR-TEM images show spherical, trigonal and rod like morphologies with sizes of Ag nanoparticles and its composite. Thermal analysis revealed that the thermal stability of the P2ATP-Ag nanocomposite is improved when compared with pure P2ATP. The synthesized AgNPs, pure P2ATP and P2ATP-Ag nanocomposite were screened for antibacterial activity test against human pathogen such as Gram positive (Bacillus subtilis, ATCC-6051) and Gram negative (Vibrio cholerae, ATCC-14035), carried out by agar-well diffusion method at micro molar concentration. The result shows that P2ATP-Ag nanocomposite has excellent antibacterial activity due to the presence of Ag nanoparticles. The electrical conductivity of the P2ATP-Ag nanocomposite is better than that of pure P2ATP. The reported nanocomposite will be a potential material for electrocatalysis, sensors and biomedical applications.
[Mh] Termos MeSH primário: Antibacterianos/química
Nanopartículas Metálicas/química
Polímeros/química
Prata/química
[Mh] Termos MeSH secundário: Antibacterianos/síntese química
Antibacterianos/farmacologia
Bacillus subtilis/efeitos dos fármacos
Condutividade Elétrica
Seres Humanos
Nanopartículas Metálicas/toxicidade
Testes de Sensibilidade Microbiana
Microscopia Eletrônica de Varredura
Espectrofotometria Ultravioleta
Espectroscopia de Infravermelho com Transformada de Fourier
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Polymers); 3M4G523W1G (Silver)
[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:171128
[St] Status:MEDLINE


  6 / 31113 MEDLINE  
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[PMID]:28468230
[Au] Autor:De La Mora-Orozco C; Flores-Lopez H; Rubio-Arias H; Chavez-Duran A; Ochoa-Rivero J
[Ad] Endereço:National Research Institute for Forestry, Agriculture and Animal Production, Km 8 Tepatitlan-Lagos de Moreno, Jalisco, 47600 Tepatitlan de Morelos, Jalisco, Mexico. delamora.celia@inifap.gob.mx.
[Ti] Título:Developing a Water Quality Index (WQI) for an Irrigation Dam.
[So] Source:Int J Environ Res Public Health;14(5), 2017 04 29.
[Is] ISSN:1660-4601
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Pollution levels have been increasing in water ecosystems worldwide. A water quality index (WQI) is an available tool to approximate the quality of water and facilitate the work of decision-makers by grouping and analyzing numerous parameters with a single numerical classification system. The objective of this study was to develop a WQI for a dam used for irrigation of about 5000 ha of agricultural land. The dam, La Vega, is located in Teuchitlan, Jalisco, Mexico. Seven sites were selected for water sampling and samples were collected in March, June, July, September, and December 2014 in an initial effort to develop a WQI for the dam. The WQI methodology, which was recommended by the Mexican National Water Commission (CNA), was used. The parameters employed to calculate the WQI were pH, electrical conductivity (EC), dissolved oxygen (DO), total dissolved solids (TDS), total hardness (TH), alkalinity (Alk), total phosphorous (TP), Cl , NO3, SO4, Ca, Mg, K, B, As, Cu, and Zn. No significant differences in WQI values were found among the seven sampling sites along the dam. However, seasonal differences in WQI were noted. In March and June, water quality was categorized as poor. By July and September, water quality was classified as medium to good. Quality then decreased, and by December water quality was classified as medium to poor. In conclusion, water treatment must be applied before waters from La Vega dam reservoir can be used for irrigation or other purposes. It is recommended that the water quality at La Vega dam is continually monitored for several years in order to confirm the findings of this short-term study.
[Mh] Termos MeSH primário: Irrigação Agrícola/normas
Monitoramento Ambiental/normas
Qualidade da Água/normas
Abastecimento de Água/normas
[Mh] Termos MeSH secundário: Cloretos/análise
Condutividade Elétrica
Concentração de Íons de Hidrogênio
Metais/análise
México
Nitratos/análise
Oxigênio/análise
Fósforo/análise
Sulfatos/análise
Poluentes da Água/análise
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Chlorides); 0 (Metals); 0 (Nitrates); 0 (Sulfates); 0 (Water Pollutants); 27YLU75U4W (Phosphorus); S88TT14065 (Oxygen)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:180201
[Lr] Data última revisão:
180201
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE


  7 / 31113 MEDLINE  
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[PMID]:28745440
[Au] Autor:Haschke S; Pankin D; Petrov Y; Bochmann S; Manshina A; Bachmann J
[Ad] Endereço:Friedrich-Alexander University Erlangen-Nürnberg, Department of Chemistry and Pharmacy, Egerlandstrasse 1, 91058, Erlangen, Germany.
[Ti] Título:Design Rules for Oxygen Evolution Catalysis at Porous Iron Oxide Electrodes: A 1000-Fold Current Density Increase.
[So] Source:ChemSusChem;10(18):3644-3651, 2017 09 22.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Nanotubular iron(III) oxide electrodes are optimized for catalytic efficiency in the water oxidation reaction at neutral pH. The nanostructured electrodes are prepared from anodic alumina templates, which are coated with Fe O by atomic layer deposition. Scanning helium ion microscopy, X-ray diffraction, and Raman spectroscopy are used to characterize the morphologies and phases of samples submitted to various treatments. These methods demonstrate the contrasting effects of thermal annealing and electrochemical treatment. The electrochemical performances of the corresponding electrodes under dark conditions are quantified by steady-state electrolysis and electrochemical impedance spectroscopy. A rough and amorphous Fe O with phosphate incorporation is critical for the optimization of the water oxidation reaction. For the ideal pore length of 17 µm, the maximum catalytic turnover is reached with an effective current density of 140 µA cm at an applied overpotential of 0.49 V.
[Mh] Termos MeSH primário: Desenho de Drogas
Condutividade Elétrica
Compostos Férricos/química
Oxigênio/química
[Mh] Termos MeSH secundário: Catálise
Eletroquímica
Eletrodos
Processos Fotoquímicos
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Ferric Compounds); 1K09F3G675 (ferric oxide); S88TT14065 (Oxygen)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:180118
[Lr] Data última revisão:
180118
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170727
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701068


  8 / 31113 MEDLINE  
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[PMID]:28453182
[Au] Autor:Thangavel R; Kaliyappan K; Ramasamy HV; Sun X; Lee YS
[Ad] Endereço:Faculty of Applied Chemical Engineering, Chonnam National University, Gwang-ju, 500-757, Korea.
[Ti] Título:Engineering the Pores of Biomass-Derived Carbon: Insights for Achieving Ultrahigh Stability at High Power in High-Energy Supercapacitors.
[So] Source:ChemSusChem;10(13):2805-2815, 2017 07 10.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Electrochemical supercapacitors with high energy density are promising devices due to their simple construction and long-term cycling performance. The development of a supercapacitor based on electrical double-layer charge storage with high energy density that can preserve its cyclability at higher power presents an ongoing challenge. Herein, we provide insights to achieve a high energy density at high power with an ultrahigh stability in an electrical double-layer capacitor (EDLC) system by using carbon from a biomass precursor (cinnamon sticks) in a sodium ion-based organic electrolyte. Herein, we investigated the dependence of EDLC performance on structural, textural, and functional properties of porous carbon engineered by using various activation agents. The results demonstrate that the performance of EDLCs is not only dependent on their textural properties but also on their structural features and surface functionalities, as is evident from the electrochemical studies. The electrochemical results are highly promising and revealed that the porous carbon with poor textural properties has great potential to deliver high capacitance and outstanding stability over 300 000 cycles compared with porous carbon with good textural properties. A very low capacitance degradation of around 0.066 % per 1000 cycles, along with high energy density (≈71 Wh kg ) and high power density, have been achieved. These results offer a new platform for the application of low-surface-area biomass-derived carbons in the design of highly stable high-energy supercapacitors.
[Mh] Termos MeSH primário: Biomassa
Carbono/química
Capacitância Elétrica
Engenharia
[Mh] Termos MeSH secundário: Adsorção
Animais
Condutividade Elétrica
Eletroquímica
Química Verde
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
7440-44-0 (Carbon)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:180118
[Lr] Data última revisão:
180118
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201700492


  9 / 31113 MEDLINE  
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[PMID]:28466284
[Au] Autor:Yang L; Hong T; Zhang Y; Arriola JGS; Nelms BL; Mu R; Li D
[Ad] Endereço:Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, 37235, USA.
[Ti] Título:A microfluidic diode for sorting and immobilization of Caenorhabditis elegans.
[So] Source:Biomed Microdevices;19(2):38, 2017 Jun.
[Is] ISSN:1572-8781
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Caenorhabditis elegans (C. elegans) is a powerful model organism extensively used in studies of human aging and diseases. Despite the numerous advantages of C. elegans as a model system, two biological characteristics may introduce complexity and variability to most studies: 1. it exhibits different biological features, composition and behaviors at different developmental stages; 2. it has very high mobility. Therefore, synchronization and immobilization of worm populations are often required. Conventionally, these processes are implemented through manual and chemical methods, which can be laborious, time-consuming and of low-throughput. Here we demonstrate a microfluidic design capable of simultaneously sorting worms by size at a throughput of 97±4 worms per minute, and allowing for worm collection or immobilization for further investigations. The key component, a microfluidic diode structure, comprises a curved head and a straight tail, which facilitates worms to enter from the curved end but prevents them from translocating from the straight side. This design remarkably enhances the efficiency and accuracy of worm sorting at relatively low flow rates, and hence provides a practical approach to sort worms even with the presence of egg clusters and debris. In addition, we show that well-sorted worms could be immobilized, kept alive and identically orientated, which could facilitate many C. elegans-based studies.
[Mh] Termos MeSH primário: Caenorhabditis elegans/isolamento & purificação
Condutividade Elétrica
Dispositivos Lab-On-A-Chip
[Mh] Termos MeSH secundário: Animais
Células Imobilizadas
Desenho de Equipamento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171225
[Lr] Data última revisão:
171225
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170504
[St] Status:MEDLINE
[do] DOI:10.1007/s10544-017-0175-2


  10 / 31113 MEDLINE  
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[PMID]:28957374
[Au] Autor:Liew JWY; Loh KS; Ahmad A; Lim KL; Wan Daud WR
[Ad] Endereço:Fuel Cell Institute, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia.
[Ti] Título:Synthesis and characterization of modified κ-carrageenan for enhanced proton conductivity as polymer electrolyte membrane.
[So] Source:PLoS One;12(9):e0185313, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Polymer electrolyte membranes based on the natural polymer κ-carrageenan were modified and characterized for application in electrochemical devices. In general, pure κ-carrageenan membranes show a low ionic conductivity. New membranes were developed by chemically modifying κ-carrageenan via phosphorylation to produce O-methylene phosphonic κ-carrageenan (OMPC), which showed enhanced membrane conductivity. The membranes were prepared by a solution casting method. The chemical structure of OMPC samples were characterized using Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) spectroscopy and 31P nuclear magnetic resonance (31P NMR) spectroscopy. The conductivity properties of the membranes were investigated by electrochemical impedance spectroscopy (EIS). The characterization demonstrated that the membranes had been successfully produced. The ionic conductivity of κ-carrageenan and OMPC were 2.79 × 10-6 S cm-1 and 1.54 × 10-5 S cm-1, respectively. The hydrated membranes showed a two orders of magnitude higher ionic conductivity than the dried membranes.
[Mh] Termos MeSH primário: Carragenina/química
Carragenina/síntese química
Eletrólitos/química
Membranas Artificiais
Polímeros/química
Prótons
[Mh] Termos MeSH secundário: Varredura Diferencial de Calorimetria
Espectroscopia Dielétrica
Condutividade Elétrica
Microscopia Eletrônica de Varredura
Espectroscopia de Prótons por Ressonância Magnética
Espectrometria por Raios X
Temperatura Ambiente
Termogravimetria
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Electrolytes); 0 (Membranes, Artificial); 0 (Polymers); 0 (Protons); 9000-07-1 (Carrageenan)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171018
[Lr] Data última revisão:
171018
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170929
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0185313



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