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  1 / 10913 MEDLINE  
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[PMID]:28471375
[Au] Autor:Zhao M; Shao GK; Huang DD; Lv XX; Guo DS
[Ad] Endereço:College of Chemistry, Chemical Engineering and Materials Science, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Shandong Normal University, Jinan 250014, China. chmeizhao@163.com.
[Ti] Título:Synthesis, Crystal Structures and Properties of Ferrocenyl Bis-Amide Derivatives Yielded via the Ugi Four-Component Reaction.
[So] Source:Molecules;22(5), 2017 May 04.
[Is] ISSN:1420-3049
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Ten ferrocenyl bis-amide derivatives were successfully synthesized via the Ugi four-component reaction by treating ferrocenecarboxylic acid with diverse aldehydes, amines, and isocyanides in methanol solution. Their chemical structures were fully characterized by IR, NMR, HR-MS, and X-ray diffraction analyses. They feature unique molecular morphologies and create a 14-membered ring motif in the centro-symmetric dimers generated in the solid state. Moreover, the electrochemical behavior of these ferrocenyl bis-amides was assessed by cyclic voltammetry.
[Mh] Termos MeSH primário: Amidas/química
Compostos Ferrosos/química
[Mh] Termos MeSH secundário: Amidas/síntese química
Cristalografia por Raios X
Técnicas Eletroquímicas
Ligações de Hidrogênio
Espectroscopia de Ressonância Magnética
Espectrometria de Massas
Espectrofotometria Infravermelho
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amides); 0 (Ferrous Compounds); 1271-42-7 (ferrocenecarboxylic acid)
[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:170505
[St] Status:MEDLINE


  2 / 10913 MEDLINE  
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[PMID]:28470446
[Au] Autor:Sundaran PS; Bhaskaran A; Alex ST; Prasad T; Haritha VH; Anie Y; Kumary TV; Anil Kumar PR
[Ad] Endereço:Division of Tissue Culture, Department of Applied Biology, Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, Kerala, 695 012, India.
[Ti] Título:Drug loaded microbeads entrapped electrospun mat for wound dressing application.
[So] Source:J Mater Sci Mater Med;28(6):88, 2017 Jun.
[Is] ISSN:1573-4838
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A new design of antibiotic loaded wound dressing and its initial in vitro evaluation is described. Chitosan microbeads loaded with ampicillin were sandwiched within polycaprolactone electrospun mat (MbAPPCL). The morphology was analyzed by scanning electron microscopy and surface chemistry was characterized by Fourier Transform Infrared Spectroscopy. In vitro cytotoxicity using L-929 fibroblast cells by direct contact test and elution assay revealed non-cytotoxic nature of MbAPPCL. The cell adhesion and viability analysis further confirmed the cytocompatibility of MbAPPCL as a wound dressing material. Percentage hemolysis and platelet adhesion on the mat exposed to blood substantiated the hemocompatibility. The antibiotic susceptibility test analyzed on Staphylococcus aureus by agar plate method confirmed the drug release and antimicrobial property. The proposed wound dressing model explained with ampicillin as a candidate drug has the potential to include microbeads with different antibiotics for multi drug treatment.
[Mh] Termos MeSH primário: Bandagens
Portadores de Fármacos
Microesferas
[Mh] Termos MeSH secundário: Animais
Antibacterianos/química
Antibacterianos/farmacologia
Materiais Biocompatíveis
Plaquetas
Linhagem Celular
Quitosana
Técnicas Eletroquímicas
Fibroblastos/fisiologia
Teste de Materiais
Camundongos
Penicilinas/química
Penicilinas/farmacologia
Staphylococcus aureus/efeitos dos fármacos
Estreptomicina/química
Estreptomicina/farmacologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Anti-Bacterial Agents); 0 (Biocompatible Materials); 0 (Drug Carriers); 0 (Penicillins); 9012-76-4 (Chitosan); Y45QSO73OB (Streptomycin)
[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:170505
[St] Status:MEDLINE
[do] DOI:10.1007/s10856-017-5893-8


  3 / 10913 MEDLINE  
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[PMID]:28942276
[Au] Autor:Wang H; Cao X; Li L; Fang Z; Li X
[Ad] Endereço:School of Energy and Environment, Southeast University, Nanjing 210096, China. Electronic address: lwcq306@163.com.
[Ti] Título:Augmenting atrazine and hexachlorobenzene degradation under different soil redox conditions in a bioelectrochemistry system and an analysis of the relevant microorganisms.
[So] Source:Ecotoxicol Environ Saf;147:735-741, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Soil microbial fuel cells (MFCs) are a sustainable technology that degrades organic pollutants while generating electricity. However, there have been no detailed studies of the mechanisms of pollutant degradation in soil MFCs. In this study, the effects of external resistance and electrode effectiveness on atrazine and hexachlorobenzene (HCB) degradation were evaluated, the performance of soil MFCs in the degradation of these pollutants under different soil redox conditions was assessed, and the associated microorganisms in the anode were investigated. With an external resistance of 20Ω, the degradation efficiencies of atrazine and HCB were 95% and 78%, respectively. The degradation efficiency, degradation rate increased with decreasing external resistance, while the half-life decreased. There were different degradation trends for different pollutants under different soil redox conditions. The fastest degradation rate of atrazine was in the upper MFC section (aerobic), whereas that of HCB was in the lower MFC section (anaerobic). The results showed that electrode effectiveness played a significant role in pollution degradation. In addition, the microbial community analysis demonstrated that Proteobacteria, especially Deltaproteobacteria involved in current generation was extremely abundant (27.49%) on soil MFC anodes, although the percentage abundances of atrazine degrading Rhodocyclaceae (8.77%), Desulfitobacterium (0.64%), and HCB degrading Desulfuromonas (0.73%), were considerably lower. The results of the study suggested that soil MFCs can enhance the degradation of atrazine and HCB, and bioelectrochemical reduction was the main mechanism for the pollutants degradation.
[Mh] Termos MeSH primário: Atrazina/análise
Fontes de Energia Bioelétrica/microbiologia
Técnicas Eletroquímicas/métodos
Hexaclorobenzeno/análise
Poluentes do Solo/análise
Solo/química
[Mh] Termos MeSH secundário: Aerobiose
Anaerobiose
Biodegradação Ambiental
Eletrodos
Meia-Vida
Cinética
Oxirredução
Proteobactérias/crescimento & desenvolvimento
Bactérias Redutoras de Enxofre/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 0 (Soil Pollutants); 4Z87H0LKUY (Hexachlorobenzene); QJA9M5H4IM (Atrazine)
[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:170925
[St] Status:MEDLINE


  4 / 10913 MEDLINE  
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[PMID]:29232610
[Au] Autor:Sadeghi S; Mollahosseini A
[Ad] Endereço:Research Laboratory of Spectroscopy & Micro and Nano Extraction, Department of Chemistry, Iran University of Science and Technology, Tehran, Iran.
[Ti] Título:Electrospun polydimethylsiloxane/polyacrylonitrile/titanium dioxide nanofibers as a new coating for determination of alpha-linolenic acid in milk by direct immersion-solid phase nanoextraction.
[So] Source:J Chromatogr B Analyt Technol Biomed Life Sci;1073:43-50, 2018 Jan 15.
[Is] ISSN:1873-376X
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:In this study, polydimethylsiloxane/polyacrylonitrile/titanium dioxide (PDMS/PAN/TiO ) nanofibers were synthesized via electrospinning method to extract and quantify alpha-linolenic acid (ALA, C18:3), as a model analyte, in milk by direct immersion-solid phase nanoextraction (DI-SPNE) with gas chromatography-flame ionization detector (GC-FID). The affecting factors on the electrospinning process such as, PDMS concentration, amount of TiO nanoparticles (NPs), voltage, and electrospinning distance were optimized using Taguchi's orthogonal design. The SPNE experimental conditions such as, extraction time, agitation rate, pH and salt concentration, were also optimized using response surface methodology (RSM) based on a central composite design (CCD). Under optimized conditions, the resulting calibration curve was linear in the range of 1-4000ngmL with R =0.998. The intraday, interday, and fiber-to-fiber repeatability were calculated and the corresponding relative standard deviation was less than 9% in all the cases. The limit of detection and limit of quantification were found to be 0.2 and 0.6ngmL , respectively. Omega-3 enriched milk was used as a real sample and the value of relative recoveries were measured to be in the range of 92-106%.
[Mh] Termos MeSH primário: Leite/química
Nanofibras/química
Nanotecnologia/métodos
Microextração em Fase Sólida/métodos
Ácido alfa-Linolênico/análise
[Mh] Termos MeSH secundário: Resinas Acrílicas
Animais
Dimetilpolisiloxanos
Técnicas Eletroquímicas
Limite de Detecção
Modelos Lineares
Reprodutibilidade dos Testes
Titânio
Ácido alfa-Linolênico/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acrylic Resins); 0 (Dimethylpolysiloxanes); 0RBV727H71 (alpha-Linolenic Acid); 15FIX9V2JP (titanium dioxide); 25014-41-9 (polyacrylonitrile); D1JT611TNE (Titanium)
[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:171213
[St] Status:MEDLINE


  5 / 10913 MEDLINE  
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[PMID]:29268102
[Au] Autor:Burgos-Castillo RC; Sirés I; Sillanpää M; Brillas E
[Ad] Endereço:Laboratory of Green Chemistry, School of Engineering Science, Lappeenranta University of Technology, Sammonkatu 12, FI-50130 Mikkeli, Finland. Electronic address: rutely.burgos.castillo@lut.fi.
[Ti] Título:Application of electrochemical advanced oxidation to bisphenol A degradation in water. Effect of sulfate and chloride ions.
[So] Source:Chemosphere;194:812-820, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Electrochemical oxidation with electrogenerated H O (EO- H O ), electro-Fenton (EF), photoelectro-Fenton (PEF) and solar PEF (SPEF) have been applied to mineralize bisphenol A solutions in 0.050 M Na SO or 0.008 M NaCl + 0.047 M Na SO at pH 3.0. The assays were performed in an undivided cell with a boron-doped diamond (BDD) anode and an air-diffusion cathode for continuous H O production. The PEF and SPEF processes yielded almost total mineralization due to the potent synergistic action of generated hydroxyl radicals and active chlorine, in conjunction with the photolytic action of UV radiation. The higher intensity of UV rays from sunlight explained the superior oxidation ability of SPEF. The effect of applied current density was studied in all treatments, whereas the role of bisphenol A concentration was examined in PEF. Bisphenol A abatement followed a pseudo-first-order kinetics, which was very quick in SPEF since UV light favored a large production of hydroxyl radicals from Fenton's reaction. Eight non-chlorinated and six chlorinated aromatics were identified as primary products in the chloride matrix. Ketomalonic, tartronic, maleic and oxalic acids were detected as final short-chain aliphatic carboxylic acids. The large stability of Fe(III)-oxalate complexes in EF compared to their fast photomineralization in PEF and PEF accounted for by the superior oxidation power of the latter processes.
[Mh] Termos MeSH primário: Compostos Benzidrílicos/química
Cloretos/farmacologia
Técnicas Eletroquímicas/métodos
Fenóis/química
Fotólise
Sulfatos/farmacologia
Poluentes Químicos da Água/química
[Mh] Termos MeSH secundário: Peróxido de Hidrogênio/química
Radical Hidroxila/química
Ferro/química
Oxirredução
Raios Ultravioleta
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Benzhydryl Compounds); 0 (Chlorides); 0 (Phenols); 0 (Sulfates); 0 (Water Pollutants, Chemical); 3352-57-6 (Hydroxyl Radical); BBX060AN9V (Hydrogen Peroxide); E1UOL152H7 (Iron); MLT3645I99 (bisphenol A)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171222
[St] Status:MEDLINE


  6 / 10913 MEDLINE  
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[PMID]:29193978
[Au] Autor:Balestri D; Roux Y; Mattarozzi M; Mucchino C; Heux L; Brazzolotto D; Artero V; Duboc C; Pelagatti P; Marchiò L; Gennari M
[Ad] Endereço:Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale, Università degli Studi di Parma , Parco Area delle Scienze 17A, 43124 Parma, Italy.
[Ti] Título:Heterogenization of a [NiFe] Hydrogenase Mimic through Simple and Efficient Encapsulation into a Mesoporous MOF.
[So] Source:Inorg Chem;56(24):14801-14808, 2017 Dec 18.
[Is] ISSN:1520-510X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In the quest for new, efficient, and noble-metal-free H -evolution catalysts, hydrogenase enzymes are a source of inspiration. Here, we describe the development of a new hybrid material based on a structural and functional [NiFe]-hydrogenase model complex (NiFe) incorporated into the Zr-based MOF PCN-777. The bulk NiFe@PCN-777 material was synthesized by simple encapsulation. Characterization by solid-state NMR and IR spectroscopy, SEM-EDX, ICP-OES, and gas adsorption confirmed the inclusion of the guest. FTO-supported thin films of the NiFe@PCN-777 composite were obtained by electrophoretic deposition of the bulk material and characterized by SEM-EDX, ICP-OES, and cyclic voltammetry. The average surface concentration of electroactive NiFe catalyst in the film was found to be ∼9.6 × 10 mol cm , implying that a surprisingly high fraction (37%) of NiFe units incorporated in the MOF are electroactive. By cyclic voltammetry, we showed that NiFe maintains its electrocatalytic capabilities for H reduction inside the MOF cavities, even if under controlled-potential electrolysis conditions the activity of NiFe cannot be discerned from that of free PCN-777 and FTO.
[Mh] Termos MeSH primário: Materiais Biomiméticos/química
Hidrogenase/química
Ferro/química
Estruturas Metalorgânicas/química
Níquel/química
Zircônio/química
[Mh] Termos MeSH secundário: Catálise
Técnicas Eletroquímicas
Modelos Moleculares
Oxirredução
Prótons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metal-Organic Frameworks); 0 (Protons); 7OV03QG267 (Nickel); C6V6S92N3C (Zirconium); E1UOL152H7 (Iron); EC 1.12.- (nickel-iron hydrogenase); EC 1.12.7.2 (Hydrogenase)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171202
[St] Status:MEDLINE
[do] DOI:10.1021/acs.inorgchem.7b01824


  7 / 10913 MEDLINE  
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[PMID]:29188999
[Au] Autor:Song LC; Zhu L; Hu FQ; Wang YX
[Ad] Endereço:Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, and ‡Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University , Tianjin 300071, China.
[Ti] Título:Studies on Chemical Reactivity and Electrocatalysis of Two Acylmethyl(hydroxymethyl)pyridine Ligand-Containing [Fe]-Hydrogenase Models (2-COCH -6-HOCH C H N)Fe(CO) L (L = η -SCOMe, η -2-SC H N).
[So] Source:Inorg Chem;56(24):15216-15230, 2017 Dec 18.
[Is] ISSN:1520-510X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:On the basis of preparation and characterization of [Fe]-H ase models (2-COCH -6-HOCH C H N)Fe(CO) L (A, L = η -SCOMe; B, L = η -2-SC H N), the chemical reactivities of A and B with various electrophilic and nucleophilic reagents have been investigated, systematically. Thus, when A reacted with 1 equiv of MeCOCl in the presence of Et N in MeCN to give the η -SCOMe-coordinated acylation product (2-COCH -6-MeCO CH C H N)Fe(CO) (η -SCOMe) (1), treatment of A with excess HBF ·Et O in MeCN gave the cationic MeCN-coordinated complex [(2-COCH -6-HOCH C H N)Fe(CO) (MeCN)](BF ) (2). In addition, when 2 was treated with 1 equiv of 2,6-(p-4-MeC H ) C H SK or PPh in CH Cl to give the thiophenolato- and PPh -substituted derivatives (2-COCH -6-HOCH C H N)Fe(CO) [2,6-(p-MeC H ) C H S] (3) and [(2-COCH -6-HOCH C H N)Fe(CO) (PPh )](BF ) (4), treatment of B with 1 equiv of PMe or P(OMe) in THF afforded the phosphine- and phosphite-substituted complexes (2-COCH -6-HOCH C H N)(η -2-SC H N)Fe(CO) L (5, L = PMe ; 6, L = P(OMe) ). Interestingly, in contrast to A, when B reacted with excess HBF ·Et O in MeCN to afford the BF adduct [2-COCH -6-HO(BF )CH C H N]Fe(CO) (η -2-SC H N) (7), reaction of B with 1 equiv of p-MeC H COCl in the presence of Et N in MeCN gave not only the expected 2-acylmethyl-6-p-toluoyloxomethylpyridine-containing complex (2-COCH -6-p-MeC H CO CH C H N)Fe(CO) (η -2-SC H N) (8), but also gave the unexpected 2-toluoyloxovinyl-6-toluoyloxomethylpyridine-containing complex (2-p-MeC H CO C H-6-p-MeC H CO CH C H N)Fe(CO) (η -2-SC H N) (9). While the possible pathways for the novel reactions leading to complexes 1, 2, and 7-9 are suggested, the structures of complexes B, 1-4, and 6-9 were unambiguously confirmed by X-ray crystallography. In addition, model complexes A and B have been found to be catalysts for proton reduction to H from TFA under CV conditions.
[Mh] Termos MeSH primário: Materiais Biomiméticos/química
Hidrogenase/química
Compostos de Ferro/química
Proteínas com Ferro-Enxofre/química
Piridinas/química
[Mh] Termos MeSH secundário: Catálise
Cristalografia por Raios X
Técnicas Eletroquímicas
Ligantes
Modelos Moleculares
Oxirredução
Prótons
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Iron Compounds); 0 (Iron-Sulfur Proteins); 0 (Ligands); 0 (Protons); 0 (Pyridines); 0 (acylmethyl(hydroxymethyl)pyridine); EC 1.12.- (iron hydrogenase); EC 1.12.7.2 (Hydrogenase)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171201
[St] Status:MEDLINE
[do] DOI:10.1021/acs.inorgchem.7b02582


  8 / 10913 MEDLINE  
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[PMID]:29372919
[Au] Autor:Karaballi RA; Merchant S; Power SR; Brosseau CL
[Ad] Endereço:Department of Chemistry, Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada. christa.brosseau@smu.ca.
[Ti] Título:Electrochemical surface-enhanced Raman spectroscopy (EC-SERS) study of the interaction between protein aggregates and biomimetic membranes.
[So] Source:Phys Chem Chem Phys;20(6):4513-4526, 2018 Feb 07.
[Is] ISSN:1463-9084
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Human diseases characterized by the uncontrolled deposition of insoluble extracellular protein aggregates are collectively referred to as amyloidoses. Such diseases include Alzheimer's, Parkinson's, Huntington's, and prion disease. In Alzheimer's disease, it is believed that amyloid-ß proteins may be responsible for pore and defect formation within cellular membranes, leading to a breakdown of cellular homeostasis causing eventual neuronal death. This theory is referred to as the amyloid pore hypothesis of Alzheimer's disease. In this work, the interaction between a model amyloid-forming protein (insulin) and a biomimetic membrane was studied at the molecular level. Protein at different stages of aggregation was allowed to interact with a biomimetic membrane formed on a nanostructured substrate using Langmuir-Blodgett/Langmuir-Schaefer deposition. Electrochemical surface-enhanced Raman spectroscopy (EC-SERS) was used to monitor the molecular level changes occurring as a result of this interaction. Based on the results it was observed that oligomers and protofibrils caused the most significant membrane deterioration whilst native protein appeared to play a protective role. To the best of our knowledge, this work represents the first EC-SERS investigation of protein aggregate-biomembrane interactions, and highlights the usefulness of this tool for studying complex biomolecular interactions.
[Mh] Termos MeSH primário: Amiloide/química
Biomimética
Insulina/química
Bicamadas Lipídicas/química
Agregados Proteicos
[Mh] Termos MeSH secundário: Amiloide/metabolismo
Técnicas Eletroquímicas
Eletrodos
Seres Humanos
Insulina/metabolismo
Bicamadas Lipídicas/metabolismo
Nanopartículas Metálicas/química
Microscopia Eletrônica de Varredura
Microscopia Eletrônica de Transmissão
Nefelometria e Turbidimetria
Prata/química
Análise Espectral Raman
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Amyloid); 0 (Insulin); 0 (Lipid Bilayers); 0 (Protein Aggregates); 3M4G523W1G (Silver)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180127
[St] Status:MEDLINE
[do] DOI:10.1039/c7cp06838g


  9 / 10913 MEDLINE  
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[PMID]:28926819
[Au] Autor:Heerema JL; Helbing CC; Pyle GG
[Ad] Endereço:Department of Biological Sciences, University of Lethbridge, Lethbridge, Alberta, Canada T1K 6T5. Electronic address: jody.heerema@gmail.com.
[Ti] Título:Use of electro-olfactography to measure olfactory acuity in the North American bullfrog (Lithobates (Rana) catesbeiana) tadpole.
[So] Source:Ecotoxicol Environ Saf;147:643-647, 2018 Jan.
[Is] ISSN:1090-2414
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Olfaction is an important sense for aquatic organisms because it provides information about their surroundings, including nearby food, mates, and predators. Electro-olfactography (EOG) is an electrophysiological technique that measures the response of olfactory tissue to olfactory stimuli, and responses are indicative of olfactory acuity. Previous studies have used this technique on a variety of species including frogs, salamanders, daphniids and, most extensively, fish. In the present study, we introduce a novel modified EOG method for use on Lithobates (Rana) catesbeiana tadpoles. Responses to a number of olfactory stimuli including amino acids, an algal extract (Spirulina), and taurocholic acid were tested, as measured by EOG. Tadpoles exhibited consistent and reliable responses to L-alanine and Spirulina extract. Tadpoles also exhibited concentration-dependent responses to Spirulina extract. These findings indicate that tadpole EOG is a viable electrophysiology technique that can be used in future research to study olfactory physiology and impairment in tadpoles.
[Mh] Termos MeSH primário: Fenômenos Eletrofisiológicos
Larva/fisiologia
Percepção Olfatória/fisiologia
Olfato/fisiologia
[Mh] Termos MeSH secundário: Alanina/química
Animais
Técnicas Eletroquímicas
Microeletrodos
Rana catesbeiana
Spirulina/química
Ácido Taurocólico/química
Estados Unidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
5E090O0G3Z (Taurocholic Acid); OF5P57N2ZX (Alanine)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180223
[Lr] Data última revisão:
180223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170920
[St] Status:MEDLINE


  10 / 10913 MEDLINE  
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[PMID]:29394010
[Au] Autor:Kleinen J; Venzmer J
[Ti] Título:Streaming potential measurements to understand the rheological properties of surfactant formulations containing anionic and zwitterionic surfactant.
[So] Source:J Cosmet Sci;67(2):59-70, 2016 Mar-Apr.
[Is] ISSN:1525-7886
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Surfactant formulations are often based on an anionic primary surfactant combined with an amphoteric secondary surfactant. One popular option is the combination of lauryl ether sulfate and cocamidopropyl betaine, because such formulations are not only mild but also easy to thicken. Changes in the molecular structure of the betaine in terms of alkyl chain length distribution and headgroup structure do have dramatic effects on the viscosity of these formulations, as can be explained in terms of properties of rod-like micelles and exchange kinetics by oscillatory rheological measurements. The root cause of the effect of the different betaine derivatives on the micellar structure, however, remains unclear when considering rheology only. Although the streaming potential of colloidal objects is typically determined to forecast the stability of dispersions, we have used the streaming potential to characterize micellar solutions of different betaine surfactant structures. It could be shown that (a) the hydrophilicity of the surfactants can be nicely probed by this method and (b) there is a good correlation of these values with the rheological properties of binary mixtures of the betaines with anionic surfactant. Also, the chemical structure of the headgroups has a significant influence on both the isoelectric point and the magnitude of the streaming potential of the zwitterionic surfactants. These effects have again a dramatic influence on the interaction with anionic surfactants, as becomes obvious when looking at the rheology of such mixtures. Therefore, the findings obtained can be utilized to better understand and design surfactant formulations of a desired viscosity profile.
[Mh] Termos MeSH primário: Betaína/análogos & derivados
Polietilenoglicóis/química
Tensoativos/química
Água/química
[Mh] Termos MeSH secundário: Betaína/química
Técnicas Eletroquímicas
Interações Hidrofóbicas e Hidrofílicas
Micelas
Estrutura Molecular
Reologia
Viscosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Micelles); 0 (Surface-Active Agents); 059QF0KO0R (Water); 26183-44-8 (dodecyl polyoxyethylene sulfuric acid); 30IQX730WE (Polyethylene Glycols); 3SCV180C9W (Betaine); 5OCF3O11KX (cocamidopropyl betaine)
[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:180203
[St] Status:MEDLINE



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