Base de dados : MEDLINE
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  1 / 1583 MEDLINE  
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[PMID]:29323888
[Au] Autor:Hosseini SH; Hosseini SA; Zohreh N; Yaghoubi M; Pourjavadi A
[Ad] Endereço:Department of Chemical Engineering, University of Science and Technology of Mazandaran , Behshahr, Iran.
[Ti] Título:Covalent Immobilization of Cellulase Using Magnetic Poly(ionic liquid) Support: Improvement of the Enzyme Activity and Stability.
[So] Source:J Agric Food Chem;66(4):789-798, 2018 Jan 31.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A magnetic nanocomposite was prepared by entrapment of Fe O nanoparticles into the cross-linked ionic liquid/epoxy type polymer. The resulting support was used for covalent immobilization of cellulase through the reaction with epoxy groups. The ionic surface of the support improved the adsorption of enzyme, and a large amount of enzyme (106.1 mg/g) was loaded onto the support surface. The effect of the presence of ionic monomer and covalent binding of enzyme was also investigated. The structure of support was characterized by various instruments such as FT-IR, TGA, VSM, XRD, TEM, SEM, and DLS. The activity and stability of immobilized cellulase were investigated in the prepared support. The results showed that the ionic surface and covalent binding of enzyme onto the support improved the activity, thermal stability, and reusability of cellulase compared to free cellulase.
[Mh] Termos MeSH primário: Celulase/química
Celulase/metabolismo
Enzimas Imobilizadas/química
Líquidos Iônicos
Fenômenos Magnéticos
Polímeros
[Mh] Termos MeSH secundário: Adsorção
Estabilidade Enzimática
Enzimas Imobilizadas/metabolismo
Compostos Férricos
Temperatura Alta
Nanopartículas de Magnetita/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Enzymes, Immobilized); 0 (Ferric Compounds); 0 (Ionic Liquids); 0 (Magnetite Nanoparticles); 0 (Polymers); EC 3.2.1.4 (Cellulase)
[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:180112
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b03922


  2 / 1583 MEDLINE  
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[PMID]:28452002
[Au] Autor:Hayashi N; Ogura A; Tsuchihashi T; Takahashi D; Matsuda T; Seino S; Doi T
[Ad] Endereço:Department of Radiological Technology, Gunma Prefectural College of Health Sciences, 323-1 Kamioki, Maebashi, Gunma, 371-0052, Japan. hayashi@gchs.ac.jp.
[Ti] Título:Magnetization and demagnetization of magnetic dental attachments in a 3-T MRI system.
[So] Source:Radiol Phys Technol;10(3):294-300, 2017 Sep.
[Is] ISSN:1865-0341
[Cp] País de publicação:Japan
[La] Idioma:eng
[Ab] Resumo:The purpose of this study was to evaluate the magnetization and demagnetization of magnetic dental attachments in a 3.0-T magnetic resonance imaging (MRI) scanner. A high-field-strength (3.0 T) MRI scanner (Achieva 3.0 T, Philips, Amsterdam, Netherlands) was used. Magnetic flux leakage was measured using a gaussmeter. To evaluate the magnetization and demagnetization of the magnetic assemblies and keepers caused by the moving in and out of the MRI scanner, the magnetic force of the attachments was measured before and after the table was moved in and out. Two settings were used wherein the magnetic assemblies and keepers were positioned on the table at angles of 0° or 90° with respect to the magnetic flux of the static magnetic field. The movement of the table was repeated 15 times. In addition, the retentive force of the magnetic dental attachments was measured after magnetic field exposure. The magnetic force of the magnetic attachments positioned at 0° decreased significantly after moving in and out of the MRI scanner (p < 0.05). In contrast, the magnetic force of the magnetic attachments positioned at 90° was stable after the movement of the table. The magnetic force of the keepers placed at both 0° and 90° was slightly increased after the movement of the table. At 0°, the retentive force of the magnet-keeper combinations decreased when the magnetic assembly was exposed to the strong magnetic flux of the MRI scanner. Therefore, the removal of all removable magnetic dentures is recommended before an MRI examination.
[Mh] Termos MeSH primário: Instrumentos Odontológicos
Fenômenos Magnéticos
Imagem por Ressonância Magnética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180130
[Lr] Data última revisão:
180130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170429
[St] Status:MEDLINE
[do] DOI:10.1007/s12194-017-0399-0


  3 / 1583 MEDLINE  
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[PMID]:28466285
[Au] Autor:Kumar V; Rezai P
[Ad] Endereço:Department of Mechanical Engineering, York University, BRG 433B, 4700 Keele St, Toronto, ON, M3J 1P3, Canada.
[Ti] Título:Magneto-Hydrodynamic Fractionation (MHF) for continuous and sheathless sorting of high-concentration paramagnetic microparticles.
[So] Source:Biomed Microdevices;19(2):39, 2017 Jun.
[Is] ISSN:1572-8781
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Sorting cells, microorganisms and particles from a solution is of paramount importance in many biological applications. An ideal sorting device should work at high throughput, involve simple design, avoid energy consumption, operate without a diluting sheath flow and perform separation with high purity. However, currently available sorting methods such as pinched flow fractionation, hydrodynamic filtration, magnetophoresis and deterministic lateral displacement meet only a few of the above-mentioned characteristics. In this paper, we report a hybrid technique combining magnetic focusing of particles in a thin microchannel and their hydrodynamic fractionation at a downstream expansion region, to devise a sheathless and high-throughput Magneto-Hydrodynamic Fractionation (MHF) method. First, sheathless magnetic focusing of 11 µm microparticles against the wall of the thin microchannel was investigated over a wide range of flow rates (0.5-5 mL h ). Then, a mixture of 5 µm and 11 µm paramagnetic particles was injected into the device at a flow rate of 5 mL h to demonstrate their sorting. Both of these magnetic particles were aligned along the wall of the channel and hence focused in the device, however their centers were lying on different streamlines due to their different sizes. Therefore, they were separated into distinct streamlines upon entering into the expansion region. Using this device, we achieved a high throughput sorting of more than 10 particles per second with an approximate on-chip fractionation purity of 98%. This technique has a great potential for separation of more than two magnetic particles for application in immunomagnetic affinity-based sorting of multiple biological substances.
[Mh] Termos MeSH primário: Hidrodinâmica
Dispositivos Lab-On-A-Chip
Fenômenos Magnéticos
Microesferas
[Mh] Termos MeSH secundário: Desenho de Equipamento
Tamanho da Partícula
[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/s10544-017-0178-z


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[PMID]:28448273
[Au] Autor:Wang JY; Healey T; Barker A; Brown B; Monk C; Anumba D
[Ad] Endereço:Academic Unit of Reproductive and Development Medicine, Jessop Wing, University of Sheffield and Sheffield Teaching Hospitals NHS Trust, Sheffield S10 2SF, United Kingdom.
[Ti] Título:Magnetic induction spectroscopy (MIS)-probe design for cervical tissue measurements.
[So] Source:Physiol Meas;38(5):729-744, 2017 May.
[Is] ISSN:1361-6579
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:OBJECTIVE: Gradiometers have the advantage of increasing measuring sensitivity, which is particularly useful in magnetic induction spectroscopy (MIS) for bio-impedance measurements. Traditional gradiometers use a pair of field sensing coils equally distant and on opposite sides of a drive coil, which provides high immunity to interference. In this paper, a ferrite-cored coaxial gradiometer probe of 29 mm diameter has been developed for measuring the impedance spectra of cervical tissues in vivo. APPROACH: It consists of a ferrite rod with outer ferrite confinement screening in order to eliminate the signals from surrounding tissue. The magnetic screening efficiency was compared with an air-cored gradiometer probe. For both gradiometer probes, a drive coil and two sensing coils were wound on a borosilicate glass former aligned coaxially with two sensing coils equidistant from the drive coil. The signal sensitivity of those two MIS gradiometers has been measured using saline samples with a conductivity range between 0.1 and 1.1 S m . Finite element methods using COMSOL Multiphysics have been used to simulate the distribution of sensitivity to conductivity over the face of each probe and with depth. MAIN RESULTS: The ferrite-cored probe has a sensitivity confined to the volume defined by the gap between the ferrite core and outer tube of ferrite while the air-cored probe without any magnetic shielding had a wide sensitivity over the face and the side of the probe. Four saline samples and one of distilled water with conductivities from 0.1 to 1.1 S m have been used to make conductivity measurements at frequencies of 50 kHz, 100 kHz, and 300 kHz. The measurement accuracy of the air-cored MIS probe was 0.09 S m at 50 kHz, improving to 0.05 S m at 300 kHz. For the ferrite-cored MIS probe, the measurement accuracy was 0.28 S m at 50 kHz, improving to 0.04 S m at 300 kHz. SIGNIFICANCE: In vivo measurements on human hand have been performed using both types of gradiometers and the conductivity is consistent with reported data.
[Mh] Termos MeSH primário: Colo do Útero/citologia
Espectroscopia Dielétrica/instrumentação
Fenômenos Magnéticos
[Mh] Termos MeSH secundário: Ar
Desenho de Equipamento
Feminino
Compostos Férricos
Análise de Elementos Finitos
Antebraço
Mãos
Seres Humanos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 1317-54-0 (ferrite)
[Em] Mês de entrada:1712
[Cu] Atualização por classe:171221
[Lr] Data última revisão:
171221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170428
[St] Status:MEDLINE
[do] DOI:10.1088/1361-6579/aa6b4e


  5 / 1583 MEDLINE  
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[PMID]:28571787
[Au] Autor:Sahu ID; Mayo DJ; Subbaraman N; Inbaraj JJ; McCarrick RM; Lorigan GA
[Ad] Endereço:Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056, United States.
[Ti] Título:Probing topology and dynamics of the second transmembrane domain (M2δ) of the acetyl choline receptor using magnetically aligned lipid bilayers (bicelles) and EPR spectroscopy.
[So] Source:Chem Phys Lipids;206:9-15, 2017 Aug.
[Is] ISSN:1873-2941
[Cp] País de publicação:Ireland
[La] Idioma:eng
[Ab] Resumo:Characterizing membrane protein structure and dynamics in the lipid bilayer membrane is very important but experimentally challenging. EPR spectroscopy offers a unique set of techniques to investigate a membrane protein structure, dynamics, topology, and distance constraints in lipid bilayers. Previously our lab demonstrated the use of magnetically aligned phospholipid bilayers (bicelles) for probing topology and dynamics of the membrane peptide M2δ of the acetyl choline receptor (AchR) as a proof of concept. In this study, magnetically aligned phospholipid bilayers and rigid spin labels were further utilized to provide improved dynamic information and topology of M2δ peptide. Seven TOAC-labeled AchR M2δ peptides were synthesized to demonstrate the utility of a multi-labeling amino acid substitution alignment strategy. Our data revealed the helical tilts to be 11°, 17°, 9°, 17°, 16°, 11°, 9°±4° for residues I7TOAC, Q13TOAC, A14TOAC, V15TOAC, C16TOAC, L17TOAC, and L18TOAC, respectively. The average helical tilt of the M2δ peptide was determined to be ∼13°. This study also revealed that the TOAC labels were attached to the M2δ peptide with different dynamics suggesting that the sites towards the C-terminal end are more rigid when compared to the sites towards the N-terminus. The dynamics of the TOAC labeled sites were more resolved in the aligned samples when compared to the randomly disordered samples. This study highlights the use of magnetically aligned lipid bilayer EPR technique to determine a more accurate helical tilt and more resolved local dynamics of AchR M2δ peptide.
[Mh] Termos MeSH primário: Membrana Celular/metabolismo
Bicamadas Lipídicas/química
Bicamadas Lipídicas/metabolismo
Fenômenos Magnéticos
Peptídeos/química
Peptídeos/metabolismo
Receptores Colinérgicos/química
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Espectroscopia de Ressonância de Spin Eletrônica
Micelas
Modelos Moleculares
Conformação Proteica em alfa-Hélice
Domínios Proteicos
Receptores Colinérgicos/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lipid Bilayers); 0 (M2 delta); 0 (Micelles); 0 (Peptides); 0 (Receptors, Cholinergic)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170731
[Lr] Data última revisão:
170731
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170603
[St] Status:MEDLINE


  6 / 1583 MEDLINE  
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[PMID]:28570934
[Au] Autor:Li WK; Zhang HX; Shi YP
[Ad] Endereço:CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; University of Chinese Academy of Sciences, Beijing 100039, PR China.
[Ti] Título:Selective determination of aromatic amino acids by magnetic hydroxylated MWCNTs and MOFs based composite.
[So] Source:J Chromatogr B Analyt Technol Biomed Life Sci;1059:27-34, 2017 Aug 01.
[Is] ISSN:1873-376X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:A novel magnetic solid-phase extraction (MSPE) based method was established for aromatic amino acids (AAAs) selective determination. Central to the method was the adopted extractant. An explored composite of metal organic frameworks (MOFs) and magnetic carbon nanotubes (CNTs) was employed for that, which exhibited superior adsorption affinity and selectivity to AAAs as compared to other amino acids with the mechanisms attributed to multiple hydrogen bonding and π-π electron-donor-acceptor (EDA) interactions. The morphology, structure and magnetic behavior of the composite were characterized and related MSPE procedure was established. Critical extraction conditions including pH, extraction time, temperature and salt addition were investigated and optimized. Subsequently the concentrations of three AAAs tryptophan (Trp), tyrosine (Tyr) and phenylalanine (Phe) in Lanzhou lily were determined by the composite based MSPE procedure coupled with high performance liquid chromatography-ultraviolet detection (HPLC-UV). The composite provided a superior sample clean-up function and many of the matrix interferences were eliminated, thus ensured AAAs were accurately and efficiently determined. The results showed that the method had good linearities with the linear coefficients above 0.99, desirable recoveries ranged from 88.0% to 96.8% with the RSD less than 5.1%, satisfactory precision and low limits of detection (LODs) which were respectively 0.04, 0.11, and 0.87ng/g for Trp, Tyr and Phe. The composite based MSPE-HPLC-UV method has great potentials for the AAAs selective determination from complex matrix samples.
[Mh] Termos MeSH primário: Aminoácidos Aromáticos/análise
Nanocompostos/química
Nanotubos de Carbono/química
Extração em Fase Sólida/métodos
[Mh] Termos MeSH secundário: Adsorção
Aminoácidos Aromáticos/isolamento & purificação
Cromatografia Líquida de Alta Pressão
Óxido Ferroso-Férrico
Concentração de Íons de Hidrogênio
Fenômenos Magnéticos
Sais
Temperatura Ambiente
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amino Acids, Aromatic); 0 (Nanotubes, Carbon); 0 (Salts); XM0M87F357 (Ferrosoferric Oxide)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170623
[Lr] Data última revisão:
170623
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170602
[St] Status:MEDLINE


  7 / 1583 MEDLINE  
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[PMID]:28536172
[Au] Autor:Zhang R; Zhou Y; Liu C; Zhang M; Yan S; Liebeskind DS; Lou M
[Ad] Endereço:From the Department of Neurology, The Second Affiliated Hospital of Zhejiang University, School of Medicine, Hangzhou, China (R.Z., Y.Z., C.L., M.Z., S.Y., M.L.); and Department of Neurology, University of California-Los Angeles Stroke Center (D.S.L.).
[Ti] Título:Overestimation of Susceptibility Vessel Sign: A Predictive Marker of Stroke Cause.
[So] Source:Stroke;48(7):1993-1996, 2017 Jul.
[Is] ISSN:1524-4628
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:BACKGROUND AND PURPOSE: The extent of blooming artifact may reflect the amount of paramagnetic material. We thus assessed the overestimation ratio of susceptibility vessel sign (SVS) on susceptibility-weighted imaging, defined as the extent of SVS width beyond the lumen and examined its value for predicting the stroke cause in acute ischemic stroke patients. METHODS: We included consecutive acute ischemic stroke patients with proximal large artery occlusion who underwent both susceptibility-weighted imaging and time-of-flight magnetic resonance angiography within 8 hours poststroke onset. We calculated the length, width, and overestimation ratio of SVS on susceptibility-weighted imaging and then investigated their values for predicting the stroke cause, respectively. RESULTS: One-hundred eleven consecutive patients (72 female; mean age, 66.6±13.4 years) were enrolled, among whom 39 (35.1%) were diagnosed with cardiogenic embolism, 43 (38.7%) with large artery atherosclerosis, and 29 (26.1%) with undetermined cause. The presence, length, width, and overestimation ratio of SVS were all independently associated with the cause of cardiogenic embolism after adjusting for baseline National Institute of Health Stroke Scale and infarct volume. After excluded patients with undetermined cause, the sensitivity and specificity of overestimation ratio of SVS for cardiogenic embolism were 0.971 and 0.913; for the length of SVS, they were 0.629 and 0.739; for the width of SVS, they were 0.829 and 0.826, respectively. CONCLUSIONS: The overestimation ratio of SVS can predict cardiogenic embolism, with both high sensitivity and specificity, which can be helpful for the management of acute ischemic stroke patients in hyperacute stage.
[Mh] Termos MeSH primário: Isquemia Encefálica/diagnóstico por imagem
Isquemia Encefálica/etiologia
Embolia/diagnóstico por imagem
Imagem por Ressonância Magnética/métodos
Acidente Vascular Cerebral/diagnóstico por imagem
Acidente Vascular Cerebral/etiologia
[Mh] Termos MeSH secundário: Idoso
Idoso de 80 Anos ou mais
Aterosclerose/complicações
Aterosclerose/diagnóstico por imagem
Biomarcadores
Embolia/complicações
Feminino
Seres Humanos
Fenômenos Magnéticos
Angiografia por Ressonância Magnética
Imagem por Ressonância Magnética/normas
Masculino
Meia-Idade
Prognóstico
Sensibilidade e Especificidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Biomarkers)
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170525
[St] Status:MEDLINE
[do] DOI:10.1161/STROKEAHA.117.016727


  8 / 1583 MEDLINE  
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[PMID]:28510134
[Au] Autor:Ushakova NA; Dontsov AE; Bastrakov AI; Garmash NY; Pavlov DS
[Ad] Endereço:Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, 119071, Russia. naushakova@gmail.com.
[Ti] Título:Paramagnetics melanin and Mn in black soldier fly Hermetia illucens.
[So] Source:Dokl Biochem Biophys;473(1):102-105, 2017 Mar.
[Is] ISSN:1608-3091
[Cp] País de publicação:Russia (Federation)
[La] Idioma:eng
[Ab] Resumo:Larva, prepupa (last instar larva), pupa, and an empty shell of pupa after hatching of the black soldier fly Hermetia illucens contain eumelanin, an active synthesis of which is observed at the prepupal stage, which is probably due to the release of prepupa from the feed substrate thickness to the open space for pupation. It was shown for the first time that prepupa contains high quantities of the magnetically active form of manganese Mn . This fact indicates that Mn stimulates the copper-containing tyrosinase-the key enzyme in the synthesis of melanin in the period of migration and adaptation of the insect to the solar radiation.
[Mh] Termos MeSH primário: Dípteros/metabolismo
Fenômenos Magnéticos
Manganês/metabolismo
Melaninas/metabolismo
[Mh] Termos MeSH secundário: Animais
Dípteros/crescimento & desenvolvimento
Estágios do Ciclo de Vida
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Melanins); 42Z2K6ZL8P (Manganese)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171019
[Lr] Data última revisão:
171019
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170517
[St] Status:MEDLINE
[do] DOI:10.1134/S1607672917020041


  9 / 1583 MEDLINE  
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[PMID]:28333055
[Au] Autor:Li XS; Fan YH; Zhang SW; Qi SH
[Ad] Endereço:State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China E-mail: shihuaqi@cug.edu.cn.
[Ti] Título:Enhanced adsorption removal of anionic dyes via a facile preparation of amino-functionalized magnetic silica.
[So] Source:Water Sci Technol;75(5-6):1399-1409, 2017 03.
[Is] ISSN:0273-1223
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A novel amino-functionalized magnetic silica (Fe O @SiO -NH ) was easily prepared via a one-step method integrating the immobilization of 3-aminopropyltriethoxysilane with a sol-gel process of tetraethyl orthosilicate into a single process. This showed significant improvement in the adsorption capacity of anionic dyes. The product (Fe O @SiO -NH ) was characterized with scanning electron microscopy, Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, zeta potential and vibrating sample magnetometry. The adsorption performance of Fe O @SiO -NH was then tested by removing acid orange 10 (AO10) and reactive black 5 (RB5) from the aqueous solutions under various experimental conditions including initial solution pH, initial dye concentrations, reaction time and temperature. The results indicated that the maximum adsorption capacity of AO10 and RB5 on Fe O @SiO -NH was 621.9 and 919.1 mg g at pH 2, respectively. The sorption isotherms fit the Langmuir model nicely. Similarly, the sorption kinetic data were better fitted into the pseudo-second order kinetic model than the pseudo-first order model. In addition, the thermodynamic data demonstrated that the adsorption process was endothermic, spontaneous and physical. Furthermore, Fe O @SiO -NH could be easily separated from aqueous solutions by an external magnetic field, and the preparation was reproducible.
[Mh] Termos MeSH primário: Corantes/isolamento & purificação
Fenômenos Magnéticos
Propilaminas/química
Silanos/química
Dióxido de Silício/química
[Mh] Termos MeSH secundário: Adsorção
Ânions/isolamento & purificação
Compostos Azo/isolamento & purificação
Concentração de Íons de Hidrogênio
Cinética
Microscopia Eletrônica de Varredura
Naftalenossulfonatos/isolamento & purificação
Reprodutibilidade dos Testes
Soluções
Espectrometria por Raios X
Espectroscopia de Infravermelho com Transformada de Fourier
Eletricidade Estática
Temperatura Ambiente
Termodinâmica
Poluentes Químicos da Água/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Anions); 0 (Azo Compounds); 0 (Coloring Agents); 0 (Naphthalenesulfonates); 0 (Propylamines); 0 (Silanes); 0 (Solutions); 0 (Water Pollutants, Chemical); 1Q6EJU80RN (Orange G); 7631-86-9 (Silicon Dioxide); L8S6UBW552 (amino-propyl-triethoxysilane); O0HDY58362 (Remazol black B)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171102
[Lr] Data última revisão:
171102
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170324
[St] Status:MEDLINE
[do] DOI:10.2166/wst.2017.009


  10 / 1583 MEDLINE  
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[PMID]:28320423
[Au] Autor:Crabolu M; Pani D; Raffo L; Conti M; Crivelli P; Cereatti A
[Ad] Endereço:Department of Electrical and Electronic Engineering, University of Cagliari, Piazza d'Armi, 09123, Cagliari, Italy. michele.crabolu@diee.unica.it.
[Ti] Título:In vivo estimation of the shoulder joint center of rotation using magneto-inertial sensors: MRI-based accuracy and repeatability assessment.
[So] Source:Biomed Eng Online;16(1):34, 2017 Mar 21.
[Is] ISSN:1475-925X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The human gleno-humeral joint is normally represented as a spherical hinge and its center of rotation is used to construct humerus anatomical axes and as reduction point for the computation of the internal joint moments. The position of the gleno-humeral joint center (GHJC) can be estimated by recording ad hoc shoulder joint movement following a functional approach. In the last years, extensive research has been conducted to improve GHJC estimate as obtained from positioning systems such as stereo-photogrammetry or electromagnetic tracking. Conversely, despite the growing interest for wearable technologies in the field of human movement analysis, no studies investigated the problem of GHJC estimation using miniaturized magneto-inertial measurement units (MIMUs). The aim of this study was to evaluate both accuracy and precision of the GHJC estimation as obtained using a MIMU-based methodology and a functional approach. METHODS: Five different functional methods were implemented and comparatively assessed under different experimental conditions (two types of shoulder motions: cross and star type motion; two joint velocities: ω = 90°/s, 180°/s; two ranges of motion: ÆŸ = 45°, 90°). Validation was conducted on five healthy subjects and true GHJC locations were obtained using magnetic resonance imaging. RESULTS: The best performing methods (NAP and SAC) showed an accuracy in the estimate of the GHJC between 20.6 and 21.9 mm and repeatability values between 9.4 and 10.4 mm. Methods performance did not show significant differences for the type of arm motion analyzed or a reduction of the arm angular velocity (180°/s and 90°/s). In addition, a reduction of the joint range of motion (90° and 45°) did not seem to influence significantly the GHJC position estimate except in a few subject-method combinations. CONCLUSIONS: MIMU-based functional methods can be used to estimate the GHJC position in vivo with errors of the same order of magnitude than those obtained using traditionally stereo-photogrammetric techniques. The methodology proposed seemed to be robust under different experimental conditions. The present paper was awarded as "SIAMOC Best Methodological Paper 2016".
[Mh] Termos MeSH primário: Processamento de Imagem Assistida por Computador
Fenômenos Magnéticos
Imagem por Ressonância Magnética
Amplitude de Movimento Articular
Rotação
Articulação do Ombro/diagnóstico por imagem
Articulação do Ombro/fisiologia
[Mh] Termos MeSH secundário: Adulto
Algoritmos
Feminino
Seres Humanos
Úmero/diagnóstico por imagem
Úmero/fisiologia
Masculino
Movimento
Imagens de Fantasmas
Reprodutibilidade dos Testes
Razão Sinal-Ruído
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170403
[Lr] Data última revisão:
170403
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170322
[St] Status:MEDLINE
[do] DOI:10.1186/s12938-017-0324-0



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