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1.
Huan Jing Ke Xue ; 40(6): 2705-2714, 2019 Jun 08.
Artigo em Chinês | MEDLINE | ID: mdl-31854662

RESUMO

A comprehensive and scientific understanding of non-point source pollutant transport pathways and source apportionment in combined sewer systems is essential for managing and improving the urban water environment. This study analyzed build-up and wash-off processes of pollutants on road surfaces and in sewers within a catchment of combined sewer systems in a typical old district in Zhuhai. Besides, source apportionment of the entire urban non-point source pollution was investigated by using the mass conservation method. The outcomes revealed that the build-up load of road deposited sediments in the study area was (28.81±10.69) g·m-2. The average wash-off load of road deposited sediments during five different rainfall events was (19.27±10.90) g·m-2 and the wash-off percentage was (52.69±13.3)%. The event mean concentrations of suspended solids (SS) in road runoff were 52-109 mg·L-1, and the event mean concentrations of SS in sewer runoff were 68-158 mg·L-1. Source apportionment analysis showed that road runoff, domestic wastewater, and sewer sediments contributed 39%-72%, <20%, and 13%-56% to SS, respectively. The thickness of sewer sediments increased by 1-14 cm during light and moderate rains, and the thickness decreased by 7-17 cm during heavy rains. It was found that rainfall characteristics affected the contribution percentages of pollution sources. The contribution of pollution from road runoff, domestic sewage, and sewer sediments in combined sewer systems were 2%-52%, 9%-65%, and 8%-81%, respectively. The derived outcomes should be useful for developing recommendations to control non-point source pollution in combined sewer systems and improve urban receiving water quality in China.

2.
Huan Jing Ke Xue ; 39(9): 4096-4104, 2018 Sep 08.
Artigo em Chinês | MEDLINE | ID: mdl-30188050

RESUMO

Different combinations of low impact development (LID) technologies can be applied for control of urban non-point source pollution. There are currently few evaluations of urban non-point source pollution and pollution load reduction based on a combination of porous asphalt and bio-retention. Taking Shenzhen International Low Carbon City as an example, road-deposited sediments were collected prior to and after rainfall events. Runoff was monitored under six typical rainfall events, from porous asphalt and the inlet/outlet of bio-retention. Through analysis of changes in the process of "build-up-wash-off-transport" of pollutant loads, the average build-up of road-deposited sediments in the study area was found to be (15.80±3.79) g·m-2; the mass percentage of road-deposited sediments (size>250 µm) was approximately 65.14%. The average wash-off percentage of six different intensity rainfall events was 17.15%, and road-deposited sediments (size<105 µm) were carried by 62.71%-74.94%. The average pollution loads of surface runoff pollutants SS, TN, and TP were 2.02, 0.025, and 0.0013 g·m-2, respectively. The removal rates of SS, TN, and TP through porous asphalt under infiltration and filtration were 70.26%, 46.29%, and 19.27%, respectively. The secondary purification removal rates of runoff water in bio-retention were 85.25%, 20.22%, and 70.27%, respectively. Pollutant loads into Dingshan River totaled 0.08, 0.011, and 0.0003 g·m-2, representing 4.05%, 43.47%, and 24.39% of runoff. The combination thus had a significant effect on runoff purification. Through quantitative research on the formation of non-point source pollution, this paper provides a scientific basis for estimating pollution loads of urban non-point source pollution and evaluating the performance of LID projects. It makes suggestions for the popularization and application of LID and sponge city design in China.

3.
Guang Pu Xue Yu Guang Pu Fen Xi ; 35(8): 2333-8, 2015 Aug.
Artigo em Chinês | MEDLINE | ID: mdl-26672320

RESUMO

Phosphogypsum, which contains more than 90% of the calcium sulfate dehydrate (CaSO4 · 2H2O), is a kind of important renewable gypsum resources. Unlike the natural gypsum, however, phosphorus, fluorine, organic matter and other harmful impurities in phosphogypsum limit its practical use. To ascertain the existence form, content and phase distribution of trace fluoride in phosphogypsum has important theoretical values in removing trace fluoride effectively. In this present paper, the main existence form and phase distribution of trace fluoride in phosphogypsum was investigated by the combination of X-ray photoelectron spectroscopy (XPS) and Electron microprobe analysis (EMPA). The results show that trace fluoride phase mainly includes NaF, KF, CaF2, K2SiF6, Na2SiF6, Na3AlF6, K3AlF6, AlF3 · 3H2O, AlF2.3(OH)0.7 · H2O, Ca5(PO4)3F, Ca10(PO4)6F2. Among them, 4.83% of fluorine exists in the form of fluoride (NaF, KF, CaF2); Accordingly, 8.43% in the form of fluoride phosphate (Ca5(PO4)3F, Ca10(PO4)6F2); 12.21% in the form of fluorine aluminate (Na3AlF6, K3AlF6); 41.52% in the form of fluorosilicate (K2SiF6, Na2SiF6); 33.02% in the form of aluminum fluoride with crystal water (AlF3 · 3H2O, AlF2.3(OH)0.7 · H2O). In the analysis of phase constitution for trace elements in solid samples, the method of combining XPS and EMPA has more advantages. This study also provides theoretical basis for the removal of trace fluorine impurity and the effective recovery of fluorine resources.

4.
Rheumatol Int ; 33(10): 2539-42, 2013 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-23624553

RESUMO

Henoch-Schönlein purpura (HSP) is the most common systemic vasculitis of childhood. The molecular etiology of HSP is not well understood. The purpose of this study is to investigate the association between polymorphisms in C1GALT1 gene and the risk of HSP in a Chinese population. A total of unrelated 542 northern Chinese were enrolled in this study. PCR-RFLP method was used to genotype the five tagging SNPs in the C1GALT1 gene. Chi-squared test and logistic regression analysis were used for the comparison of genotype distribution between cases and controls. The five tagging SNPs were all in Hardy-Weinberg equilibrium in controls. SNP7 was significantly associated with HSP risk, P = 0.005. The DI genotype, compared with the DD genotype, was associated with a significantly higher risk of developing HSP (OR 1.72; 95 % CI 1.11-2.67). The II genotype, compared with the DD genotype, was associated with a significantly higher risk of developing HSP (OR 3.39; 95 % CI 1.16-9.30). Other SNPs were not associated with HSP risk. Variations in the C1GALT1 gene were found to be associated with HSP risk. Further studies are warranted to validate our findings and to investigate into its underlining mechanism.


Assuntos
Galactosiltransferases/genética , Predisposição Genética para Doença , Polimorfismo de Nucleotídeo Único , Púrpura de Schoenlein-Henoch/genética , Adolescente , Alelos , Grupo com Ancestrais do Continente Asiático/genética , Estudos de Casos e Controles , Criança , Pré-Escolar , China , Feminino , Frequência do Gene , Estudos de Associação Genética , Genótipo , Humanos , Masculino , Risco
5.
Huan Jing Ke Xue ; 34(1): 357-63, 2013 Jan.
Artigo em Chinês | MEDLINE | ID: mdl-23487962

RESUMO

Road-deposited sediment (RDS) is an important carrier of the diffused pollution. This study analyzed the influences of the urban-suburban-rural gradient (central urban, urban village, central suburban county, rural town, and rural village areas) on the content and chemical fractions of heavy metals. The concentrations of five heavy metals (Cr, Cu, Ni, Pb, and Zn) in RDS in the central urban area were the highest, and the lowest concentrations appeared in the rural village area. The mass of RDS per unit area were opposite to the metals concentrations in distribution. The proportion of weak acid extractable Ni, Pb, and Zn in RDS was higher than that of Cr and Cu. The contribution of heavy metals in smaller grain size (32.4% - 62.4%) was greater than that in coarser grain size (22.9% - 49.6%). It will be helpful to reduce the RDS pollution for runoff and apply appropriate strategies for controlling runoff pollution from RDS according to RDS and its contribution to heavy metal pollution along the urban-rural gradient.


Assuntos
Poeira/análise , Poluentes Ambientais/análise , Metais Pesados/análise , Chuva , Movimentos da Água , China , Cidades , Monitoramento Ambiental , Sedimentos Geológicos/química , População Rural , População Urbana
6.
Huan Jing Ke Xue ; 33(3): 810-6, 2012 Mar.
Artigo em Chinês | MEDLINE | ID: mdl-22624372

RESUMO

The heavy metal pollution in runoff caused by street dust washoff has been an increasingly prominent problem in the context of rapid urbanization in China. Based on measurement of heavy metal contents in street dusts with different particle sizes and an experiment of street dust washoff using simulated rainfall, we analyzed the role of particle size of street dust in heavy metal pollution, and the variation in geometrical forms of heavy metals during street dust washoff. Our results showed that the heavy metal concentration decreased from "static" street dust to "dynamic" runoff particulate in the same diameter particles. Heavy metals in street dust were dissolved and extracted during washoff. The average loss proportion of the five metals (Cr, Cu, Ni, Pb, Zn) were 24.3%, 56.8%, 34.3%, 22.8%, 27.3%, respectively. The loss proportion increased with the decrease of the particle size of street dust. Proportion of extracted form dust was higher in street than that in washoff samples, which suggested some dissolved loss in water. In washoff samples, dissolved metals of waterphase did not have significant changes; however, heavy metals with particle state in waterphase reduced rapidly during runoff. Meanwhile, heavy metals of solid-phase particle reduced during runoff. Street dust with small particle size had higher loss rate during runoff. The variation rate of street dust loss among different particle sizes varied from 4.6% to 62.1%. Street dust with smaller particle size had higher migration ability in runoff, which was more risky to urban water pollution.


Assuntos
Poeira , Metais Pesados/análise , Chuva , Movimentos da Água , Poluentes Químicos da Água/análise , China , Cidades , Monitoramento Ambiental , Tamanho da Partícula , Emissões de Veículos/análise
7.
Talanta ; 85(2): 885-90, 2011 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-21726714

RESUMO

A novel method combining high performance liquid chromatography (HPLC) fingerprint and simultaneous quantitative analysis of multiple active components was developed and validated for quality evaluation of one type of traditional Chinese medicine preparations: Shuang-huang-lian (SHL) oral liquid formulation. For fingerprint analysis, 45 peaks were selected as the common peaks to evaluate the similarities among several different SHL oral liquid preparations collected from manufacturers. Additionally, simultaneous quantification of eleven markers, including chlorogenic acid, caffeic acid, rutin, forsythiaside, scutellarin, baicalin, forsythin, luteoloside, apigenin, baicalein and wogonin, was performed. Statistical analysis of the obtained data demonstrated that our method has achieved desired linearity, precision and accuracy. Finally, concentrations of these eleven markers in SHL oral liquid prepared by different manufacturers in China were determined. These results demonstrated that the combination of HPLC chromatographic fingerprint and simultaneous quantification of multi-ingredients offers an efficient and reliable approach for quality evaluation of SHL oral liquid preparations.


Assuntos
Cromatografia Líquida de Alta Pressão/métodos , Medicamentos de Ervas Chinesas/química , Medicina Tradicional Chinesa/normas , Administração Oral , Composição de Medicamentos/normas , Medicamentos de Ervas Chinesas/administração & dosagem , Limite de Detecção , Modelos Lineares , Controle de Qualidade , Reprodutibilidade dos Testes
8.
Biosens Bioelectron ; 26(5): 2781-5, 2011 Jan 15.
Artigo em Inglês | MEDLINE | ID: mdl-21111599

RESUMO

Herein, a rapid electrochemical biosensor for L-histidine based on highly specific, L-histidine-dependent DNAzymes is described. DNA with a single, sessile ribo-adenine, self-cleaves in the presence of L-histidine, allowing a ferrocene tag to transfer electrons to the electrode. The double-stranded DNA complex was chemi-absorbed to a gold electrode via a 3' terminal thiol. The signal of this proposed sensor is linear over the range, 1 nM to 10 µM, with R=0.98775. To improve signal intensity, gold nanoparticles were anchored to a gold electrode surface which had been previously modified with self-assembled monolayers of 1,6-hexanedithiol. With gold nanoparticle modification, a lower detection limit of 0.1 pM L-histidine and a good linear relationship over the range, 0.1 pM to 50 nM were obtained. The proposed biosensor presents high specificity for L-histidine, is not affected by the presence of other amino acids, and demonstrates excellent enantio-selectivity toward L-histidine. This proposed sensor protocol offers reasonable selectivity, rapid speed, and operational convenience for real sample assays.


Assuntos
Técnicas Biossensoriais/instrumentação , Condutometria/instrumentação , DNA Catalítico/química , DNA/química , Eletrodos , Histidina/análise , Sistemas de Computação , Desenho de Equipamento , Análise de Falha de Equipamento , Histidina/química
9.
Zhonghua Yi Xue Za Zhi ; 91(44): 3115-9, 2011 Nov 29.
Artigo em Chinês | MEDLINE | ID: mdl-22340652

RESUMO

OBJECTIVE: To evaluate the associations between polymorphisms Arg389Gly of ß1-adrenergic receptor gene and essential hypertension risk. METHODS: "Hypertension", "polymorphism", "Arg389Gly" and "beta1-adrenergic" or "beta1-adrenoceptor" were used as key words to search the relevant publications between January 1990 and June 2011 in the databases of Pubmed, CNKI and Wanfang. Additional references cited in the retrieved articles were also evaluated. Between-study heterogeneity test was performed by the χ(2)-based Q test. Fix/random-effect model was used for data pooling. Publication bias was evaluated with the linear regression asymmetry Egger's and Begg's tests. RESULTS: Fourteen case-control studies containing 6429 cases of essential hypertension cases and 6986 controls were included for the analyses of Arg389Gly and risk of essential hypertension. Between-study heterogeneity was significant across all studies (q = 37.32, P < 0.001). After stratification by sample size, among the sub-group with a sample size of over 500 cases, the Gly/Gly carriers had significantly a lower risk of essential hypertension than the Arg/Arg carriers (OR = 0.84, 95%CI 0.73 - 0.98). There was no between-study heterogeneity (q = 1.10, P = 0.777). In addition, the risk borderline decreased in the Arg/Gly carriers (OR = 0.95, 95%CI 0.91 - 1.00). The results of dominant model also showed that the risk of essential hypertension significantly decreased (OR = 0.95, 95%CI 0.91 - 0.99) among the Arg/Gly and Gly/Gly carries versus the Arg/Arg carriers. CONCLUSION: The Arg389Gly Arg/Arg genotype carriers are associated with an elevated risk of essential hypertension. And Arg389Gly of ß1-adrenergic receptor gene may play a role in the susceptibility of essential hypertension.


Assuntos
Hipertensão/genética , Polimorfismo de Nucleotídeo Único , Receptores Adrenérgicos beta 1/genética , Alelos , Genótipo , Humanos
10.
Zhonghua Yu Fang Yi Xue Za Zhi ; 44(9): 820-4, 2010 Sep.
Artigo em Chinês | MEDLINE | ID: mdl-21092627

RESUMO

OBJECTIVE: To evaluate the associations between polymorphisms of methionine synthase(MTR) A2756G and methionine synthase reductase(MTRR) G66A and risk of coronary artery disease. METHODS: Literatures in Medline reporting the relationship between polymorphisms of MTR A2756G and MTRR G66A and risk of coronary artery disease from January 1990 to May 2010 were searched. A total of 14 relevant articles were selected and 13 of them met the criteria. A Meta-analysis was performed to estimate the pooled odds ratio (OR) to evaluate the relationship between polymorphisms of MTR A2756G and MTRR G66A and risk of coronary artery disease. All analyses were performed using the STATA statistical software. RESULTS: Among the 13 studies, eight case-control studies containing 2143 cases of coronary artery disease and 2270 controls were included in the analysis of MTR A2756G and risk of coronary artery disease. Meanwhile, five case-control studies with 811 cases of coronary artery disease and 387 controls were included in the analysis of MTRR G66A and risk of coronary artery disease. In the analysis of MTRR G66A related to the risk of coronary artery disease, there were 246 GG carries, 397 AG carriers and 168 AA carriers in the group of coronary artery disease, against 102 GG carriers, 203 AG carriers and 82 AA carriers in the control group. Compared with the MTRR GG carriers, the risk of coronary artery disease decreased significantly by 27% (OR = 0.73, 95%CI: 0.54 - 0.99) and 25% (OR = 0.75, 95%CI: 0.56 - 1.00) (Egger's test t = -0.19, P = 0.862) in the MTRR 66 AG and AG/AA carriers, respectively, and also decreased in the MTRR AA carriers but significant difference was observed (OR = 0.84, 95%CI: 0.42 - 1.68). There was no significant association between coronary artery disease and MTR A2756G. CONCLUSION: These results suggest that MTRR66 may play a role in coronary artery disease susceptibility. MTRR 66 A allele carries are associated with a statistically significant decreased risk of coronary artery disease susceptibility.


Assuntos
5-Metiltetra-Hidrofolato-Homocisteína S-Metiltransferase/genética , Doença da Artéria Coronariana/genética , Ferredoxina-NADP Redutase/genética , Predisposição Genética para Doença , Alelos , Genótipo , Humanos
11.
Zhonghua Nei Ke Za Zhi ; 49(6): 469-72, 2010 Jun.
Artigo em Chinês | MEDLINE | ID: mdl-20979730

RESUMO

OBJECTIVE: To study the risk prediction for new intracerebral hemorrhage (ICH) with high sensitivity C-reactive protein (hs-CRP) level. METHODS: In a retrospective, nested, case-controlled study, 323 cases of ICH were identified and matched with 646 controls. The hs-CRP levels at baseline were compared between the two groups. The relevance of different hs-CRP levels and the risk of ICH were analyzed. RESULTS: The ICH group had a higher median hs-CRP levels (1.10 mg/L) as compared with the control group (0.66 mg/L) with significant difference (P<0.01). In addition, the increase of risk associated with hs-CRP levels was primarily observed in the individuals with the highest quartile of hs-CRP levels (>2.12 mg/L). These patients had an increased risk of ICH (OR 2.58, 95%CI 1.77 to 3.76) as compared with those in the lowest quartile (≤0.30 mg/L). Individuals with baseline hs-CRP levels above the specified cut point of 3 mg/L or more and those in the 80th percentile were at a markedly increased risk of ICH (for specified cut point of 3 mg/L, OR 2.26, 95%CI 1.60 - 3.20, P<0.01; for 80th percentile, OR 2.24, 95%CI 1.60 - 3.13, P<0.01, respectively). CONCLUSIONS: Risk of ICH might be predicted with the level of hs-CRP. With the increase of hs-CRP level at baseline, the risk of ICH was increased.


Assuntos
Proteína C-Reativa/metabolismo , Hemorragias Intracranianas/diagnóstico , Acidente Vascular Cerebral/diagnóstico , Idoso , Estudos de Casos e Controles , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Estudos Retrospectivos , Fatores de Risco
12.
Zhongguo Gu Shang ; 22(10): 783-4, 2009 Oct.
Artigo em Chinês | MEDLINE | ID: mdl-19902766

RESUMO

OBJECTIVE: To analyze the reasons of the complications,and the measures taken for the prevention and treatment by percutaneous vertebroplasty (PVP) for osteoporotic thoracolumbars vertebral compressive fractures. METHODS: From May 2004 to June 2008, 204 patients with 286 diseased vertebrae underwent PVP under the guidance of C-arm fluoroscopy, and 56 patients with complications included 18 males, 38 females, ranging in age from 58 to 93 years, with an average of 72 years. The condition of leakage of bone cement and complications was observed. RESULTS: The complications related to the leakage of PMMA found in 60 vertebrae in 49 cases: vertebral canal in 5 cases, intervertebral foramina in 3 cases, soft tissue besides vertebrae in 20 cases,intervertebral discs in 15 cases, venous plexus besides vertebrae in 6 cases. The complications no related to the leakage of PMMA found in 7 cases: the nerve roots injuried in 3 cases; the pain of the patient worsened temporarily in 2 cases; the blood pressure of the patient descent temporarily in 2 cases. CONCLUSION: The main reasons of complications are no-integrated of the compressived vertebrae,unstandard skills of injecting,unsuitable opportunity and quantity of injecting PMMA, unsufficient monitoring of C-arm fluoroscopy, the toxicity of PMMA. The measures of prevention and treatment is strict indication, standard skills of injecting, sufficient monitoring of C-arm fluoroscopy, suitable opportunity and quantity of injecting PMMA, electrocardio-monitoring in operation.


Assuntos
Fraturas por Compressão/complicações , Fraturas por Compressão/cirurgia , Complicações Pós-Operatórias/prevenção & controle , Fraturas da Coluna Vertebral/complicações , Fraturas da Coluna Vertebral/cirurgia , Idoso , Idoso de 80 Anos ou mais , Cimentos para Ossos/efeitos adversos , Feminino , Humanos , Vértebras Lombares/cirurgia , Masculino , Pessoa de Meia-Idade , Polimetil Metacrilato/efeitos adversos , Vertebroplastia
13.
Proc Natl Acad Sci U S A ; 104(10): 3698-702, 2007 Mar 06.
Artigo em Inglês | MEDLINE | ID: mdl-17360415

RESUMO

The metal-independent decomposition of organic hydroperoxides and the formation of organic alkoxyl radicals in the absence or presence of halogenated quinones were studied with electron spin resonance (ESR) and the spin-trapping agent 5,5-dimethyl-1-pyrroline N-oxide (DMPO). We found that 2,5-dichloro-1,4-benzoquinone (DCBQ) markedly enhanced the decomposition of tert-butylhydroperoxide (t-BuOOH), leading to the formation of the DMPO adducts with t-butoxyl radicals (t-BuO* and methyl radicals *CH(3)). The formation of DMPO/t-BuO* and DMPO/*CH(3) was dose-dependent with respect to both DCBQ and t-BuOOH and was not affected by iron- or copper-specific metal chelators. Comparison of the data obtained with DCBQ and t-BuOOH with those obtained in a parallel study with ferrous iron and t-BuOOH strongly suggested that t-BuO* was produced by DCBQ and t-BuOOH through a metal-independent mechanism. Other halogenated quinones were also found to enhance the decomposition of t-BuOOH and other organic hydroperoxides such as cumene hydroperoxide, leading to the formation of the respective organic alkoxyl radicals in a metal-independent manner. Based on these data, we propose a mechanism for DCBQ-mediated t-BuOOH decomposition and formation of t-BuO*: a nucleophilic attack of t-BuOOH on DCBQ, forming a chloro-t-butylperoxyl-1,4-benzoquinone intermediate, which decomposes homolytically to produce t-BuO*. This represents a mechanism of organic alkoxyl radical formation not requiring the involvement of redox-active transition metal ions.


Assuntos
Espectroscopia de Ressonância de Spin Eletrônica/métodos , Metais/química , Quinonas/química , Marcadores de Spin , Derivados de Benzeno/química , Benzoquinonas/química , Quelantes/farmacologia , Óxidos N-Cíclicos/química , Radicais Livres , Íons , Modelos Químicos , Modelos Moleculares , Oxirredução , Espectrometria de Massas por Ionização por Electrospray
14.
Free Radic Biol Med ; 32(5): 465-73, 2002 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-11864786

RESUMO

The metal-independent production of hydroxyl radicals (*OH) from H(2)O(2) and tetrachloro-1,4-benzoquinone (TCBQ), a carcinogenic metabolite of the widely used wood-preservative pentachlorophenol, was studied by electron spin resonance methods. When incubated with the spin trapping agent 5,5-dimethyl-1-pyrroline N-oxide (DMPO), TCBQ and H(2)O(2) produced the DMPO/*OH adduct. The formation of DMPO/*OH was markedly inhibited by the *OH scavenging agents dimethyl sulfoxide (DMSO), ethanol, formate, and azide, with the concomitant formation of the characteristic DMPO spin trapping adducts with *CH(3), *CH(CH(3))OH, *COO(-), and *N(3), respectively. The formation of DMPO/*OH and DMPO/*CH(3) from TCBQ and H(2)O(2) in the absence and presence, respectively, of DMSO was inhibited by the trihydroxamate compound desferrioxamine, accompanied by the formation of the desferrioxamine-nitroxide radical. In contrast, DMPO/*OH and DMPO/*CH(3) formation from TCBQ and H(2)O(2) was not affected by the nonhydroxamate iron chelators bathophenanthroline disulfonate, ferrozine, and ferene, as well as the copper-specific chelator bathocuproine disulfonate. A comparative study with ferrous iron and H(2)O(2), the classic Fenton system, strongly supports our conclusion that *OH is produced by TCBQ and H(2)O(2) through a metal-independent mechanism. Metal-independent production of *OH from H(2)O(2) was also observed with several other halogenated quinones.


Assuntos
Cloranila/química , Cobre , Óxidos N-Cíclicos/química , Peróxido de Hidrogênio/química , Radical Hidroxila/metabolismo , Ferro , Quelantes , Cloranila/metabolismo , Óxidos N-Cíclicos/metabolismo , Espectroscopia de Ressonância de Spin Eletrônica , Peróxido de Hidrogênio/metabolismo , Radical Hidroxila/química , Estrutura Molecular , Marcadores de Spin
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