Base de dados : MEDLINE
Pesquisa : D01.029.260 [Categoria DeCS]
Referências encontradas : 40 [refinar]
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[PMID]:27979291
[Au] Autor:Ma Y; Dong W; Bao H; Fang Y; Fan C
[Ad] Endereço:College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Weiyang University Circle, Xi'an 710021, PR China; Mathematical and Sciences College, LouYang Normal University, University Street, Luoyang 471022, PR China. Electronic address: mayongjie113@163.com.
[Ti] Título:Simultaneous determination of urea and melamine in milk powder by nonlinear chemical fingerprint technique.
[So] Source:Food Chem;221:898-906, 2017 Apr 15.
[Is] ISSN:0308-8146
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:This paper proposed a nonlinear chemical fingerprint method for simultaneous determination of urea and melamine in milk powder using "H +Ce +BrO +malonic acid" as reaction system. A multiple linear relationship was obtained between the adulterants content in milk powder and inductive time of corresponding mixed milk powder. System analysis model established with classical least squares (CLS) method was then used to calculate the content of urea and melamine in milk powder. The method was successfully applied to milk powder samples and had good recoveries in the range of 99.17-100.25%, with the relative standard deviation (RSD) in the range of 0.60-4.12%. The limits of detection for urea and melamine were 0.33µg·g and 0.05µg·g , respectively. The limits of quantification were 1.11µg·g and 0.18µg·g , respectively. The results indicated that the new method was feasible and had the advantages of low cost, simple operation and without pretreatment of samples.
[Mh] Termos MeSH primário: Técnicas Eletroquímicas/métodos
Leite/química
Triazinas/análise
Ureia/análise
[Mh] Termos MeSH secundário: Ácidos não Carboxílicos
Animais
Cério
Contaminação de Alimentos/análise
Limite de Detecção
Malonatos
Pós/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Malonates); 0 (Powders); 0 (Triazines); 0 (bromic acid); 30K4522N6T (Cerium); 8W8T17847W (Urea); 9KX7ZMG0MK (malonic acid); N3GP2YSD88 (melamine)
[Em] Mês de entrada:1704
[Cu] Atualização por classe:171003
[Lr] Data última revisão:
171003
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161217
[St] Status:MEDLINE


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[PMID]:27917575
[Au] Autor:Janniger CK; Schwartz RA
[Ad] Endereço:Rutgers New Jersey Medical School.
[Ti] Título:Efficacy and tolerability of a new topical nitric-zinc preparation for "difficult-to-treat" warts.
[So] Source:Dermatol Ther;30(2), 2017 Mar.
[Is] ISSN:1529-8019
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Treating plantar, periungual, and external genital warts can be challenging. A prospective study from four centers in Italy evaluated 37 immunocompetent patients with single or multiple warts and treated each lesion with a nitric-zinc topical solution composed of organic and inorganic acids meant to devitalize tissue and destroy HPV DNA in infected keratinocytes. Thirty of the 37 patients had external genital warts, two had plantar warts, two had palm and finger warts, and three had subungual warts for a total of 55 lesions treated. Nitric-zinc aqueous solution was applied over each wart utilizing a 30 µL capillary tube until a whitening response was observed. Additional applications as needed were accomplished at 2-week intervals until the wart was gone. In those with hand, plantar, and subungual warts, there was a 100% clearance after two to three sessions. Three with external genital warts had only a partial response and one no benefit after four applications. Thus, this approach was effective in external genital and other "difficult-to-treat" warts in 90% of patients after one to four applications. It also was easy to use with no adverse events noted.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/administração & dosagem
Ácidos Carboxílicos/administração & dosagem
Condiloma Acuminado/tratamento farmacológico
Fármacos Dermatológicos/administração & dosagem
Dermatoses do Pé/tratamento farmacológico
Dermatoses da Mão/tratamento farmacológico
Verrugas/tratamento farmacológico
[Mh] Termos MeSH secundário: Ácidos não Carboxílicos/efeitos adversos
Administração Cutânea
Ácidos Carboxílicos/efeitos adversos
Condiloma Acuminado/diagnóstico
Condiloma Acuminado/virologia
Fármacos Dermatológicos/efeitos adversos
Esquema de Medicação
Composição de Medicamentos
Dermatoses do Pé/diagnóstico
Dermatoses do Pé/virologia
Dermatoses da Mão/diagnóstico
Dermatoses da Mão/virologia
Seres Humanos
Indução de Remissão
Fatores de Tempo
Resultado do Tratamento
Verrugas/diagnóstico
Verrugas/virologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Carboxylic Acids); 0 (Dermatologic Agents)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161206
[St] Status:MEDLINE
[do] DOI:10.1111/dth.12456


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[PMID]:27628708
[Au] Autor:Soe CM; Stoumpos CC; Harutyunyan B; Manley EF; Chen LX; Bedzyk MJ; Marks TJ; Kanatzidis MG
[Ad] Endereço:Department of Chemistry, Northwestern University, Evanston, IL, 60628, USA.
[Ti] Título:Room Temperature Phase Transition in Methylammonium Lead Iodide Perovskite Thin Films Induced by Hydrohalic Acid Additives.
[So] Source:ChemSusChem;9(18):2656-2665, 2016 Sep 22.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Although reactive additives have been employed in perovskite solar cells to enhance film morphology and significantly increase device performance, little is known about the effect of these additives on perovskite structural and optical properties. Here we report a systematic study of how the properties of methylammonium lead iodide perovskite (CH NH PbI ) are influenced by hydrohalic acid additives (HX; X=I, Br, Cl) in the precursor solution. Detailed structural and optical spectroscopic analysis reveals that all three acids affect the optical properties and alter the unit cell lattice parameters. Depending on the identity and concentration of HX, optical bandgaps widen or compress: addition of HBr yields a wider bandgap, whereas HI compresses the gap at high concentrations; HCl, on the other hand, has no significant effect on the bandgap. These changes can be understood by correlating them with the types of defects present in polycrystalline perovskite thin films in combination with the structural strain induced in very small crystallites. The presence of extra halides from HX in the precursor solution enables filling of the lattice vacancies in the perovskite, thereby altering metal-halogen-metal bond connectivity and consequently cell volumes and optical bandgaps. Remarkably, a room temperature tetragonal→cubic phase transition is observed for CH NH PbI films treated with high HX concentrations. Further insights into this anomalous phase transformation are obtained from in situ variable-temperature X-ray diffraction in the 25-55 °C (298-328 K) range, revealing a monotonic fall in transition temperature with increasing precursor solution HX concentration.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/química
Iodetos/química
Chumbo/química
Metilaminas/química
Transição de Fase
Temperatura Ambiente
[Mh] Termos MeSH secundário: Modelos Moleculares
Conformação Molecular
Fenômenos Ópticos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Iodides); 0 (Methylamines); 2P299V784P (Lead); BSF23SJ79E (methylamine)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170606
[Lr] Data última revisão:
170606
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160916
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201600879


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[PMID]:26699274
[Au] Autor:Fukuda Y; Kataoka Y; Sano Y; Takizawa K; Watanabe T; Teshima R
[Ad] Endereço:Japan Frozen Foods Inspection Corporation.
[Ti] Título:[Development and Applicability of Analytical Methods for Quantifying Cyanide and Bromic Acid in Mineral Waters].
[So] Source:Shokuhin Eiseigaku Zasshi;56(6):256-62, 2015.
[Is] ISSN:1882-1006
[Cp] País de publicação:Japan
[La] Idioma:jpn
[Ab] Resumo:We developed and evaluated methods of quantifying cyanide (cyanide ion and cyanogen chloride) and bromic acid in mineral waters (MW). After performance evaluation, recovery studies were performed on 110 kinds of MW products to examine the applicability of the methods. The approximate proportion of the MW samples, in which the recovery rate of these anionic compounds was within 90 to 110%, was 95% in the cyanide ion and bromic acid analysis and 45% in the cyanogen chloride analysis. We observed low rates of recovery of cyanogen chloride from some MW products with pH values around neutral. To increase the recovery rate, we propose adding phosphoric acid buffer to adjust the pH of these MW samples. The retention times for bromic acid in some MW products differed from that in standard solution. We concluded that carbonic acid influences the retention times. It may be necessary to to exclude carbon dioxide from the MW samples by degassing to synchronize the retention times of bromic acid in the MW samples and the standard solution.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/análise
Cromatografia por Troca Iônica/métodos
Cianetos/análise
Águas Minerais/análise
Qualidade da Água
[Mh] Termos MeSH secundário: Tampões (Química)
Dióxido de Carbono
Ácido Carbônico
Concentração de Íons de Hidrogênio
Ácidos Fosfóricos
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Buffers); 0 (Cyanides); 0 (Mineral Waters); 0 (Phosphoric Acids); 0 (bromic acid); 142M471B3J (Carbon Dioxide); 463-79-6 (Carbonic Acid); 697I61NSA0 (cyanogen chloride); E4GA8884NN (phosphoric acid)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:151224
[Lr] Data última revisão:
151224
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151225
[St] Status:MEDLINE
[do] DOI:10.3358/shokueishi.56.256


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[PMID]:26473634
[Au] Autor:Bedjanian Y; Morin J; Romanias MN
[Ad] Endereço:Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS and Université d'Orléans , 45071 Cedex 2, Orléans, France.
[Ti] Título:Gas-Phase Reaction of Hydroxyl Radical with p-Cymene over an Extended Temperature Range.
[So] Source:J Phys Chem A;119(45):11076-83, 2015 Nov 12.
[Is] ISSN:1520-5215
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The kinetics of the reaction of OH radicals with p-cymene has been studied in the temperature range of 243-898 K using a flow reactor combined with a quadrupole mass spectrometer: OH + p-cymene → products. The reaction rate constant was determined as a result of absolute measurements, from OH decay kinetics in excess of p-cymene and employing the relative rate method with OH reactions with n-pentane, n-heptane,1,3-dioxane, HBr, and Br2 as the reference ones. For the rate coefficient of the H atom abstraction channel, the expression k1b = (3.70 ± 0.42) × 10(-11) exp[-(772 ± 72)/T] was obtained over the temperature range of 381-898 K. The total rate constant (addition + abstraction) determined at T = 243-320 K was k1 = (1.82 ± 0.48) × 10(-12) exp[(607 ± 70)/T] or, in a biexponential form, k1 = k1a + k1b = 3.7 × 10(-11) exp(-772/T) + 6.3 × 10(-13) exp(856/T), independent of the pressure between 1 and 5 Torr of helium. In addition, our results indicate that the reaction pathway involving alkyl radical elimination upon initial addition of OH to p-cymene is most probably unimportant.
[Mh] Termos MeSH primário: Gases/química
Radical Hidroxila/química
Monoterpenos/química
Temperatura Ambiente
[Mh] Termos MeSH secundário: Ácidos não Carboxílicos/química
Ácidos Bóricos/química
Hélio/química
Heptanos/química
Ácido Bromídrico/química
Hidrogênio/química
Cinética
Espectrometria de Massas
Pentanos/química
Pressão
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Boric Acids); 0 (Gases); 0 (Heptanes); 0 (Monoterpenes); 0 (Pentanes); 0 (bromic acid); 1G1C8T1N7Q (4-cymene); 206GF3GB41 (Helium); 3352-57-6 (Hydroxyl Radical); 3IY7CNP8XJ (Hydrobromic Acid); 456148SDMJ (n-heptane); 4FEX897A91 (pentane); 7YNJ3PO35Z (Hydrogen); R57ZHV85D4 (boric acid)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:151112
[Lr] Data última revisão:
151112
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151017
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jpca.5b08478


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[PMID]:25533373
[Au] Autor:Li S
[Ad] Endereço:Zaozhuang Center for Disease Control and Prevention, Shandong Zaozhuang 277101, China.
[Ti] Título:[Determination a variety of acidic gas in air of workplace by Ion Chromatography].
[So] Source:Zhonghua Lao Dong Wei Sheng Zhi Ye Bing Za Zhi;32(10):774-6, 2014 Oct.
[Is] ISSN:1001-9391
[Cp] País de publicação:China
[La] Idioma:chi
[Ab] Resumo:OBJECTIVE: To establish a method for determination of a variety of acid gas in the workplace air by Ion Chromatography. (hydrofluoric acid, hydrogen chloride or hydrochloric acid, sulfur anhydride or sulfuric acid, phosphoric acid, oxalic acid). METHOD: The sample in workplace air was collected by the porous glass plate absorption tube containing 5 ml leacheate. (Sulfuric acid fog, phosphoric acid aerosol microporous membrane after collection, eluted with 5 ml of eluent.) To separated by AS14+AG14 chromatography column, by carbonate (2.0+1.0) mmol/L (Na(2)CO(3)-NaHCO(3)) as eluent, flow rate of 1 ml/min, then analyzed by electrical conductivity detector. The retain time was used for qualitative and the peak area was used for quantitation. RESULTS: The each ion of a variety of acid gas in the air of workplace were excellent in carbonate eluent separation. The linear range of working curve of 0∼20 mg/L. The correlation coefficient r>0.999; lower detection limit of 3.6∼115 µg/L; quantitative limit of 0.012∼0.53 mg/L; acquisition of 15L air were measured, the minimum detection concentration is 0.004 0∼0.13 mg/m(3). The recovery rate is 99.7%∼101.1%. In the sample without mutual interference ions. Samples stored at room temperature for 7 days. CONCLUSION: The same analysis method, the detection of various acidic gases in the air of workplace, simple operation, good separation effect, high sensitivity, high detection efficiency, easy popularization and application.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/análise
Poluentes Ocupacionais do Ar/análise
Cromatografia/métodos
[Mh] Termos MeSH secundário: Ar/análise
Gases
Ácido Clorídrico
Ácido Fluorídrico
Íons/análise
Limite de Detecção
Ácidos Fosfóricos
Ácidos Sulfúricos
Local de Trabalho
[Pt] Tipo de publicação:ENGLISH ABSTRACT; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Air Pollutants, Occupational); 0 (Gases); 0 (Ions); 0 (Phosphoric Acids); 0 (Sulfuric Acids); E4GA8884NN (phosphoric acid); O40UQP6WCF (sulfuric acid); QTT17582CB (Hydrochloric Acid); RGL5YE86CZ (Hydrofluoric Acid)
[Em] Mês de entrada:1604
[Cu] Atualização por classe:141223
[Lr] Data última revisão:
141223
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:141224
[St] Status:MEDLINE


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[PMID]:24831187
[Au] Autor:Yajima K; Yamaguchi K; Mizuno N
[Ad] Endereço:Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. tmizuno@mail.ecc.u-tokyo.ac.jp.
[Ti] Título:Facile access to 3,5-symmetrically disubstituted 1,2,4-thiadiazoles through phosphovanadomolybdic acid catalyzed aerobic oxidative dimerization of primary thioamides.
[So] Source:Chem Commun (Camb);50(51):6748-50, 2014 Jun 28.
[Is] ISSN:1364-548X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In the presence of Keggin-type phosphovanadomolybdic acids, e.g., H6PV3Mo9O40, oxidative dimerization of various kinds of primary thioamides including aromatic, heterocyclic, and aliphatic ones efficiently proceeded to give the corresponding 3,5-disubstituted 1,2,4-thiadiazoles in excellent yields.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/química
Tiadiazóis/síntese química
Tioamidas/síntese química
[Mh] Termos MeSH secundário: Aerobiose
Catálise
Dimerização
Compostos Heterocíclicos/síntese química
Indicadores e Reagentes
Molibdênio/química
Oxirredução
Compostos de Fósforo/química
Espectrometria de Massas por Ionização por Electrospray
Tiadiazóis/química
Tioamidas/química
Compostos de Vanádio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Heterocyclic Compounds); 0 (Indicators and Reagents); 0 (Phosphorus Compounds); 0 (Thiadiazoles); 0 (Thioamides); 0 (Vanadium Compounds); 81AH48963U (Molybdenum)
[Em] Mês de entrada:1505
[Cu] Atualização por classe:140530
[Lr] Data última revisão:
140530
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:140517
[St] Status:MEDLINE
[do] DOI:10.1039/c4cc02313g


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[PMID]:24016229
[Au] Autor:Jansens KJ; Lagrain B; Brijs K; Goderis B; Smet M; Delcour JA
[Ad] Endereço:Laboratory of Food Chemistry and Biochemistry, KU Leuven , Kasteelpark Arenberg 20, B-3001 Leuven, Belgium.
[Ti] Título:Impact of acid and alkaline pretreatments on the molecular network of wheat gluten and on the mechanical properties of compression-molded glassy wheat gluten bioplastics.
[So] Source:J Agric Food Chem;61(39):9393-400, 2013 Oct 02.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Wheat gluten can be converted into rigid biobased materials by high-temperature compression molding at low moisture contents. During molding, a cross-linked protein network is formed. This study investigated the effect of mixing gluten with acid/alkali in 70% ethanol at ambient temperature for 16 h followed by ethanol removal, freeze-drying, and compression molding at 130 and 150 °C on network formation and on types of cross-links formed. Alkaline pretreatment (0-100 mmol/L sodium hydroxide or 25 mmol/L potassium hydroxide) strongly affected gluten cross-linking, whereas acid pretreatment (0-25 mmol/L sulfuric acid or 25 mmol/L hydrochloric acid) had limited effect on the gluten network. Molded alkaline-treated gluten showed enhanced cross-linking but also degradation when treated with high alkali concentrations, whereas acid treatment reduced gluten cross-linking. ß-Elimination of cystine and lanthionine formation occurred more pronouncedly at higher alkali concentrations. In contrast, formation of disulfide and nondisulfide cross-links during molding was hindered in acid-pretreated gluten. Bioplastic strength was higher for alkali than for acid-pretreated samples, whereas the flexural modulus was only slightly affected by either alkaline or acid pretreatment. Apparently, the ratio of disulfide to nondisulfide cross-links did not affect the mechanical properties of rigid gluten materials.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/química
Plásticos Biodegradáveis/química
Glutens/química
Hidróxidos/química
Indicadores e Reagentes/química
Sementes/química
Triticum/química
[Mh] Termos MeSH secundário: Fenômenos Químicos
Módulo de Elasticidade/efeitos dos fármacos
Temperatura Alta
Ácido Clorídrico/química
Fenômenos Mecânicos
Concentração Osmolar
Compostos de Potássio/química
Conformação Proteica
Hidróxido de Sódio/química
Solubilidade
Ácidos Sulfúricos/química
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Biodegradable Plastics); 0 (Hydroxides); 0 (Indicators and Reagents); 0 (Potassium Compounds); 0 (Sulfuric Acids); 55X04QC32I (Sodium Hydroxide); 8002-80-0 (Glutens); O40UQP6WCF (sulfuric acid); QTT17582CB (Hydrochloric Acid); WZH3C48M4T (potassium hydroxide)
[Em] Mês de entrada:1407
[Cu] Atualização por classe:161128
[Lr] Data última revisão:
161128
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130911
[St] Status:MEDLINE
[do] DOI:10.1021/jf403156c


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[PMID]:23353765
[Au] Autor:Chen J; Wang WH; Liu TW; Wu FH; Zheng HL
[Ad] Endereço:Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystem, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian 361005, PR China.
[Ti] Título:Photosynthetic and antioxidant responses of Liquidambar formosana and Schima superba seedlings to sulfuric-rich and nitric-rich simulated acid rain.
[So] Source:Plant Physiol Biochem;64:41-51, 2013 Mar.
[Is] ISSN:1873-2690
[Cp] País de publicação:France
[La] Idioma:eng
[Ab] Resumo:To study whether differential responses occur in photosynthesis and antioxidant system for seedlings of Liquidambar formosana, an acid rain (AR)-sensitive tree species and Schima superba, an AR-tolerant tree species treated with three types of pH 3.0 simulated AR (SiAR) including sulfuric-rich (S-SiAR), nitric-rich (N-SiAR), sulfate and nitrate mixed (SN-SiAR), we investigated the changes of leaf necrosis, chlorophyll content, soluble protein and proline content, photosynthesis and chlorophyll fluorescence characteristics, reactive oxygen species production, membrane lipid peroxidation, small molecular antioxidant content, antioxidant enzyme activities and related protein expressions. Our results showed that SiAR significantly caused leaf necrosis, inhibited photosynthesis, induced superoxide radical and hydrogen peroxide generation, aggravated membrane lipid peroxidation, changed antioxidant enzyme activities, modified related protein expressions such as Cu/Zn superoxide dismutase (SOD), l-ascorbate peroxidase (APX, EC 1. 11. 1. 11), glutathione S transferase (GST, EC 2. 5. 1. 18) and Rubisco large subunit (RuBISCO LSU), altered non-protein thiols (NPT) and glutathione (GSH) content in leaves of L. formosana and S. superba. Taken together, we concluded that the damages caused by SiAR in L. formosana were more severe and suffered from more negative impacts than in S. superba. S-SiAR induced more serious damages for the plants than did SN-SiAR and N-SiAR.
[Mh] Termos MeSH primário: Chuva Ácida/efeitos adversos
Ácidos não Carboxílicos/efeitos adversos
Antioxidantes/metabolismo
Liquidambar/fisiologia
Fotossíntese
Estresse Fisiológico
Theaceae/fisiologia
[Mh] Termos MeSH secundário: Membrana Celular
Peróxido de Hidrogênio/metabolismo
Peroxidação de Lipídeos
Liquidambar/metabolismo
Ácido Nítrico/efeitos adversos
Folhas de Planta
Ribulose-Bifosfato Carboxilase/metabolismo
Plântulas
Compostos de Sulfidrila/metabolismo
Ácidos Sulfúricos/efeitos adversos
Superóxidos/metabolismo
Theaceae/metabolismo
Árvores
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Acid Rain); 0 (Acids, Noncarboxylic); 0 (Antioxidants); 0 (Sulfhydryl Compounds); 0 (Sulfuric Acids); 11062-77-4 (Superoxides); 411VRN1TV4 (Nitric Acid); BBX060AN9V (Hydrogen Peroxide); EC 4.1.1.39 (Ribulose-Bisphosphate Carboxylase); O40UQP6WCF (sulfuric acid)
[Em] Mês de entrada:1308
[Cu] Atualização por classe:161020
[Lr] Data última revisão:
161020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130129
[St] Status:MEDLINE


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[PMID]:23334006
[Au] Autor:Su CH
[Ad] Endereço:Graduate School of Biochemical Engineering, Ming-Chi University of Technology, No. 84 Gungjuan Rd., Taishan, Taipei 24301, Taiwan, ROC. chsu@mail.mcut.edu.tw
[Ti] Título:Kinetic study of free fatty acid esterification reaction catalyzed by recoverable and reusable hydrochloric acid.
[So] Source:Bioresour Technol;130:522-8, 2013 Feb.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The catalytic performance and recoverability of several homogeneous acid catalysts (hydrochloric, sulfuric, and nitric acids) for the esterification of enzyme-hydrolyzed free fatty acid (FFA) and methanol were studied. Although all tested catalysts drove the reaction to a high yield, hydrochloric acid was the only catalyst that could be considerably recovered and reused. The kinetics of the esterification reaction catalyzed by hydrochloric acid was investigated under varying catalyst loading (0.1-1M), reaction temperature (303-343K), and methanol/FFA molar ratio (1:1-20:1). In addition, a pseudo-homogeneous kinetic model incorporating the above factors was developed. A good agreement (r(2)=0.98) between the experimental and calculated data was obtained, thus proving the reliability of the model. Furthermore, the reusability of hydrochloric acid in FFA esterification can be predicted by the developed model. The recoverable hydrochloric acid achieved high yields of FFA esterification within five times of reuse.
[Mh] Termos MeSH primário: Ácidos não Carboxílicos/química
Biocombustíveis
Ácidos Graxos não Esterificados/química
[Mh] Termos MeSH secundário: Ácidos não Carboxílicos/isolamento & purificação
Catálise
Esterificação
Ácidos Graxos não Esterificados/metabolismo
Cinética
Metanol/química
Modelos Químicos
Temperatura Ambiente
[Pt] Tipo de publicação:COMPARATIVE STUDY; EVALUATION STUDIES; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids, Noncarboxylic); 0 (Biofuels); 0 (Fatty Acids, Nonesterified); Y4S76JWI15 (Methanol)
[Em] Mês de entrada:1309
[Cu] Atualização por classe:131121
[Lr] Data última revisão:
131121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:130122
[St] Status:MEDLINE



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