Base de dados : MEDLINE
Pesquisa : G02.111.380 [Categoria DeCS]
Referências encontradas : 3185 [refinar]
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  1 / 3185 MEDLINE  
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[PMID]:28470621
[Au] Autor:Wallace S; Balskus EP
[Ad] Endereço:Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA, 02138, USA.
[Ti] Título:Interfacing Biocompatible Reactions with Engineered Escherichia coli.
[So] Source:Methods Mol Biol;1586:409-421, 2017.
[Is] ISSN:1940-6029
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Biocompatible chemistry represents a new way of merging chemical and biological synthesis by interfacing nonenzymatic reactions with metabolic pathways. This approach can enable the production of nonnatural molecules directly from renewable starting materials via microbial fermentation. When developing a new biocompatible reaction certain criteria must be satisfied, i.e., the reaction must be (1) functional in aqueous growth media at ambient temperature and pH, (2) nontoxic to the producing microorganism, and (3) have negligible effects on the targeted metabolic pathway. This chapter provides a detailed outline of two biocompatible reaction procedures (hydrogenation and cyclopropanation), and describes some of the chemical and microbiological experiments and considerations required during biocompatible reaction development.
[Mh] Termos MeSH primário: Escherichia coli/genética
Escherichia coli/metabolismo
Engenharia Metabólica/métodos
[Mh] Termos MeSH secundário: Catálise
Ciclopropanos/metabolismo
Escherichia coli/crescimento & desenvolvimento
Fermentação
Glucose
Hidrogenação
Redes e Vias Metabólicas
Biologia Sintética/métodos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Cyclopropanes); 99TB643425 (cyclopropane); IY9XDZ35W2 (Glucose)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180220
[Lr] Data última revisão:
180220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170505
[St] Status:MEDLINE
[do] DOI:10.1007/978-1-4939-6887-9_27


  2 / 3185 MEDLINE  
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[PMID]:29291262
[Au] Autor:Aldai N; Delmonte P; Alves SP; Bessa RJB; Kramer JKG
[Ad] Endereço:Department of Pharmacy and Food Sciences, University of the Basque Country (UPV/EHU) , Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain.
[Ti] Título:Evidence for the Initial Steps of DHA Biohydrogenation by Mixed Ruminal Microorganisms from Sheep Involves Formation of Conjugated Fatty Acids.
[So] Source:J Agric Food Chem;66(4):842-855, 2018 Jan 31.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Incubation of DHA with sheep rumen fluid resulted in 80% disappearance in 6 h. The products were analyzed as their fatty acid (FA) methyl esters by GC-FID on SP-2560 and SLB-IL111 columns. The GC-online reduction × GC and GC-MS techniques demonstrated that all DHA metabolites retained the C22 structure (no evidence of chain-shortening). Two new transient DHA products were identified: mono-trans methylene interrupted-DHA and monoconjugated DHA (MC-DHA) isomers. Identification of MC-DHA was confirmed by their predicted elution using equivalent chain length differences from C18 FA, their molecular ions, and the 22:5 products formed which were the most abundant at 6 h. The 22:5 structures were established by fragmentation of their 4,4-dimethyloxazoline derivatives, and all 22:5 products contained an isolated double bond, suggesting formation via MC-DHA. The most abundant c4,c7,c10,t14,c19-22:5 appeared to be formed by unknown isomerases. Results suggest that the initial biohydrogenation of DHA was analogous to that of C18 FA.
[Mh] Termos MeSH primário: Ácidos Docosa-Hexaenoicos/metabolismo
Rúmen/microbiologia
Ovinos
[Mh] Termos MeSH secundário: Animais
Cromatografia Gasosa/métodos
Ácidos Docosa-Hexaenoicos/química
Esterificação
Ácidos Graxos/metabolismo
Hidrogenação
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fatty Acids); 25167-62-8 (Docosahexaenoic Acids)
[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:180102
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b04563


  3 / 3185 MEDLINE  
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[PMID]:27773235
[Au] Autor:Zhang C; Chen X
[Ad] Endereço:College of Environmental Science and Engineering, Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tianjin, China. Electronic address: zhangchengdong@nankai.edu.cn.
[Ti] Título:Different effects of sonication pretreatment on carbon nanomaterials under low hydrogen peroxide concentrations.
[So] Source:Ultrason Sonochem;34:19-26, 2017 01.
[Is] ISSN:1873-2828
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:Dispersing carbon nanomaterials with the aid of sonication has become a widely used procedure for generating homogenous solutions. A systematic study was performed to evaluate the effects of a practical sample preparation procedure that involves mild sonication with/without low concentrations of hydrogen peroxide. Hydrogen peroxide is ubiquitously present in surface water and involved in advanced oxidation processes. Significant oxidation was observed for fullerene in the liquid phase, whereas an appreciable amount of hydrogen was covalently attached to the carbon cage of solid fullerene. Under the same conditions, only the removal of oxidized amorphous carbon was detected for carbon nanotubes. The presence of a low concentration of hydrogen peroxide during sonication exacerbated the effects. The changes in physicochemical properties were characterized quantitatively using X-ray photoelectron spectroscopy and elemental chemical analysis and qualitatively using matrix-assisted laser desorption ionization mass spectroscopy, H nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy and Raman spectroscopy. Our results highlight the effects that can occur during sample preparation step and the potential for misinterpreting the toxicity, reactivity and environmental fate of carbon nanomaterials.
[Mh] Termos MeSH primário: Peróxido de Hidrogênio/química
Nanotubos de Carbono/química
Sonicação
[Mh] Termos MeSH secundário: Fulerenos/química
Hidrogenação
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Fullerenes); 0 (Nanotubes, Carbon); BBX060AN9V (Hydrogen Peroxide); NP9U26B839 (fullerene C60)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180131
[Lr] Data última revisão:
180131
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161025
[St] Status:MEDLINE


  4 / 3185 MEDLINE  
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[PMID]:28868763
[Au] Autor:Shinde S; Rode C
[Ad] Endereço:Chemical Engineering and Process Development Division, CSIR National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India.
[Ti] Título:Cascade Reductive Etherification of Bioderived Aldehydes over Zr-Based Catalysts.
[So] Source:ChemSusChem;10(20):4090-4101, 2017 Oct 23.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:An efficient one-pot catalytic cascade sequence has been developed for the production of value-added ethers from bioderived aldehydes. Etherification of 5-(hydroxymethyl)furfural with different aliphatic alcohols over acidic Zr-montmorillonite (Zr-Mont) catalyst produced a mixture of 5-(alkoxymethyl)furfural and 2-(dialkoxymethyl)-5-(alkoxymethyl)furan. The latter was selectively converted back into 5-(alkoxymethyl)furfural by treating it with water over the same catalyst. The synthesis of 2,5-bis(alkoxymethyl)furan was achieved through a cascade sequence involving etherification, transfer hydrogenation, and re-etherification over a combination of acidic Zr-Mont and the charge-transfer hydrogenation catalyst [ZrO(OH) ]. This catalyst combination was further explored for the cascade conversion of 2-furfuraldehyde into 2-(alkoxymethyl)furan. The scope of this strategy was then extended for the reductive etherification of lignin-derived arylaldehydes to obtain the respective benzyl ethers in >80 % yield. Additionally, the mixture of Zr-Mont and ZrO(OH) does not undergo mutual destruction, which was proved by recycling experiments and XRD analysis. Both the catalysts were thoroughly characterized using BET, temperature-programmed desorption of NH and CO , pyridine-FTIR, XRD, inductively coupled plasma optical emission spectroscopy, and X-ray photoelectron spectroscopy techniques.
[Mh] Termos MeSH primário: Aldeídos/química
Éteres/química
Zircônio/química
[Mh] Termos MeSH secundário: 2-Propanol/química
Catálise
Furaldeído/análogos & derivados
Furaldeído/química
Hidrogenação
Modelos Moleculares
Conformação Molecular
Oxirredução
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Aldehydes); 0 (Ethers); 70ETD81LF0 (5-hydroxymethylfurfural); C6V6S92N3C (Zirconium); DJ1HGI319P (Furaldehyde); ND2M416302 (2-Propanol)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170905
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701275


  5 / 3185 MEDLINE  
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[PMID]:28860355
[Au] Autor:Kattel S; Ramírez PJ; Chen JG; Rodriguez JA; Liu P
[Ad] Endereço:Chemistry Division, Brookhaven National Laboratory, Upton, NY 11973, USA.
[Ti] Título:Response to Comment on "Active sites for CO hydrogenation to methanol on Cu/ZnO catalysts".
[So] Source:Science;357(6354), 2017 09 01.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:In their Comment on the our recent Report, Nakamura argue that our x-ray photoelectron spectroscopy (XPS) analysis was affected by the presence of formate species on the catalyst surface. This argument is not valid because the reactant gases were evacuated at temperatures from 525 to 575 kelvin, conditions under which formate is not stable on the catalyst surface. An analysis of the XPS results obtained after exposing zinc oxide/copper (111) [ZnO/Cu(111)] surfaces to hydrogen (H ) and mixtures of carbon dioxide (CO )/H show an absence of carbon (C) 1s signal, no asymmetries in the oxygen (O) 1s peak, and a Zn:O intensity close to 1:1. Thus, the most active phase of these catalysts contained a ZnO-Cu interface.
[Mh] Termos MeSH primário: Domínio Catalítico
Metanol/química
[Mh] Termos MeSH secundário: Catálise
Hidrogenação
Óxido de Zinco/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; COMMENT
[Nm] Nome de substância:
SOI2LOH54Z (Zinc Oxide); Y4S76JWI15 (Methanol)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170902
[St] Status:MEDLINE


  6 / 3185 MEDLINE  
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[PMID]:28860354
[Au] Autor:Nakamura J; Fujitani T; Kuld S; Helveg S; Chorkendorff I; Sehested J
[Ad] Endereço:Tsukuba Research Center for Interdisciplinary Materials Science, Faculty of Pure and Applied Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8573, Japan. nakamura@ims.tsukuba.ac.jp jss@topsoe.dk ibchork@fysik.dtu.dk.
[Ti] Título:Comment on "Active sites for CO hydrogenation to methanol on Cu/ZnO catalysts".
[So] Source:Science;357(6354), 2017 09 01.
[Is] ISSN:1095-9203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Kattel (Reports, 24 March 2017, p. 1296) report that a zinc on copper (Zn/Cu) surface undergoes oxidation to zinc oxide/copper (ZnO/Cu) during carbon dioxide (CO ) hydrogenation to methanol and conclude that the Cu-ZnO interface is the active site for methanol synthesis. Similar experiments conducted two decades ago by Fujitani and Nakamura demonstrated that Zn is attached to formate rather than being fully oxidized.
[Mh] Termos MeSH primário: Domínio Catalítico
Metanol/química
[Mh] Termos MeSH secundário: Catálise
Hidrogenação
Óxido de Zinco/química
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; COMMENT
[Nm] Nome de substância:
SOI2LOH54Z (Zinc Oxide); Y4S76JWI15 (Methanol)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171024
[Lr] Data última revisão:
171024
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170902
[St] Status:MEDLINE


  7 / 3185 MEDLINE  
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[PMID]:28834404
[Au] Autor:Gu M; Xia Q; Liu X; Guo Y; Wang Y
[Ad] Endereço:Shanghai Key Laboratory of Functional Materials Chemistry and, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science of Technology, No. 130 Meilong Road, Shanghai, 200237, P.R. China.
[Ti] Título:Synthesis of Renewable Lubricant Alkanes from Biomass-Derived Platform Chemicals.
[So] Source:ChemSusChem;10(20):4102-4108, 2017 Oct 23.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:The catalytic synthesis of liquid alkanes from renewable biomass has received tremendous attention in recent years. However, bio-based platform chemicals have not to date been exploited for the synthesis of highly branched lubricant alkanes, which are currently produced by hydrocracking and hydroisomerization of long-chain n-paraffins. A selective catalytic synthetic route has been developed for the production of highly branched C alkanes as lubricant base oil components from biomass-derived furfural and acetone through a sequential four-step process, including aldol condensation of furfural with acetone to produce a C double adduct, selective hydrogenation of the adduct to a C ketone, followed by a second condensation of the C ketone with furfural to generate a C aldol adduct, and finally hydrodeoxygenation to give highly branched C alkanes in 50.6 % overall yield from furfural. This work opens a general strategy for the synthesis of high-quality lubricant alkanes from renewable biomass.
[Mh] Termos MeSH primário: Alcanos/química
Alcanos/síntese química
Biomassa
Lubrificantes/química
Lubrificantes/síntese química
[Mh] Termos MeSH secundário: Acetona/química
Técnicas de Química Sintética
Furaldeído/química
Hidrogenação
Oxigênio/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alkanes); 0 (Lubricants); 1364PS73AF (Acetone); DJ1HGI319P (Furaldehyde); S88TT14065 (Oxygen)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170824
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701200


  8 / 3185 MEDLINE  
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[PMID]:28806421
[Au] Autor:Ning W; Wang T; Chen H; Yang X; Jin Y
[Ad] Endereço:College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, China.
[Ti] Título:The effect of Fe2O3 crystal phases on CO2 hydrogenation.
[So] Source:PLoS One;12(8):e0182955, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The effect of Fe2O3 crystal phases on their performance in CO2 hydrogenation was studied. α-Fe2O3 crystal was prepared by precipitation method from Fe(NO3)3·9H2O and (NH4)2CO3, and γ-Fe2O3 was prepared by grinding Fe(NO3)3·9H2O and L(+)-Tartaric acid in agate mortar completely. The crystal phases of Fe2O3 influence the distribution of promoter Zn, K and Cu on catalysts. The dispersity of K on γ-Fe2O3 surface is higher than α-Fe2O3. On the contrary, Cu and Zn are more dispersive on α-Fe2O3 surface than γ-Fe2O3. The catalyst in γ-Fe2O3 phase is easily reduced relative to the catalyst in α-Fe2O3 phase. The former presents higher CO2 conversion and C2+ hydrocarbon selectivity than the latter in CO2 hydrogenation.
[Mh] Termos MeSH primário: Dióxido de Carbono/química
Compostos Férricos/química
[Mh] Termos MeSH secundário: Catálise
Cristalização
Hidrogenação
Oxirredução
Espectroscopia Fotoeletrônica
Temperatura Ambiente
Difração de Raios X
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Ferric Compounds); 142M471B3J (Carbon Dioxide); 1K09F3G675 (ferric oxide)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171009
[Lr] Data última revisão:
171009
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170815
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182955


  9 / 3185 MEDLINE  
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[PMID]:28762664
[Au] Autor:Ji G; Duan Y; Zhang S; Fei B; Chen X; Yang Y
[Ad] Endereço:CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, P.R. China.
[Ti] Título:Selective Semihydrogenation of Alkynes Catalyzed by Pd Nanoparticles Immobilized on Heteroatom-Doped Hierarchical Porous Carbon Derived from Bamboo Shoots.
[So] Source:ChemSusChem;10(17):3427-3434, 2017 Sep 11.
[Is] ISSN:1864-564X
[Cp] País de publicação:Germany
[La] Idioma:eng
[Ab] Resumo:Highly dispersed palladium nanoparticles (Pd NPs) immobilized on heteroatom-doped hierarchical porous carbon supports (N,O-carbon) with large specific surface areas are synthesized by a wet chemical reduction method. The N,O-carbon derived from naturally abundant bamboo shoots is fabricated by a tandem hydrothermal-carbonization process without assistance of any templates, chemical activation reagents, or exogenous N or O sources in a simple and ecofriendly manner. The prepared Pd/N,O-carbon catalyst shows extremely high activity and excellent chemoselectivity for semihydrogenation of a broad range of alkynes to versatile and valuable alkenes under ambient conditions. The catalyst can be readily recovered for successive reuse with negligible loss in activity and selectivity, and is also applicable for practical gram-scale reactions.
[Mh] Termos MeSH primário: Alquinos/química
Carbono/química
Nanopartículas Metálicas/química
Paládio/química
Brotos de Planta/química
Poaceae/química
[Mh] Termos MeSH secundário: Catálise
Química Verde
Hidrogenação
Tamanho da Partícula
Porosidade
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Alkynes); 5TWQ1V240M (Palladium); 7440-44-0 (Carbon)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170918
[Lr] Data última revisão:
170918
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170802
[St] Status:MEDLINE
[do] DOI:10.1002/cssc.201701127


  10 / 3185 MEDLINE  
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[PMID]:28701464
[Au] Autor:Johnson KM; Phan TTN; Albertolle ME; Guengerich FP
[Ad] Endereço:From the Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146.
[Ti] Título:Human mitochondrial cytochrome P450 27C1 is localized in skin and preferentially desaturates -retinol to 3,4-dehydroretinol.
[So] Source:J Biol Chem;292(33):13672-13687, 2017 Aug 18.
[Is] ISSN:1083-351X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Recently, zebrafish and human cytochrome P450 (P450) 27C1 enzymes have been shown to be retinoid 3,4-desaturases. The enzyme is unusual among mammalian P450s in that the predominant oxidation is a desaturation and in that hydroxylation represents only a minor pathway. We show by proteomic analysis that P450 27C1 is localized to human skin, with two proteins of different sizes present, one being a cleavage product of the full-length form. P450 27C1 oxidized all- -retinol to 3,4-dehydroretinol, 4-hydroxy (OH) retinol, and 3-OH retinol in a 100:3:2 ratio. Neither 3-OH nor 4-OH retinol was an intermediate in desaturation. No kinetic burst was observed in the steady state; neither the rate of substrate binding nor product release was rate-limiting. Ferric P450 27C1 reduction by adrenodoxin was 3-fold faster in the presence of the substrate and was ∼5-fold faster than the overall turnover. Kinetic isotope effects of 1.5-2.3 (on / ) were observed with 3,3-, 4,4-, and 3,3,4,4-deuterated retinol. Deuteration at C-4 produced a 4-fold increase in 3-hydroxylation due to metabolic switching, with no observable effect on 4-hydroxylation. Deuteration at C-3 produced a strong kinetic isotope effect for 3-hydroxylation but not 4-hydroxylation. Analysis of the products of deuterated retinol showed a lack of scrambling of a putative allylic radical at C-3 and C-4. We conclude that the most likely catalytic mechanism begins with abstraction of a hydrogen atom from C-4 (or possibly C-3) initiating the desaturation pathway, followed by a sequential abstraction of a hydrogen atom or proton-coupled electron transfer. Adrenodoxin reduction and hydrogen abstraction both contribute to rate limitation.
[Mh] Termos MeSH primário: Família 27 do Citocromo P450/metabolismo
Regulação Enzimológica da Expressão Gênica
Mitocôndrias/enzimologia
Pele/enzimologia
Vitamina A/análogos & derivados
Vitamina A/metabolismo
[Mh] Termos MeSH secundário: Biocatálise
Família 27 do Citocromo P450/genética
Perfilação da Expressão Gênica
Seres Humanos
Hidrogenação
Hidroxilação
Isoenzimas/genética
Isoenzimas/metabolismo
Cinética
Estrutura Molecular
Especificidade de Órgãos
Oxirredução
Fragmentos de Peptídeos/genética
Fragmentos de Peptídeos/metabolismo
Proteólise
Proteômica/métodos
Estereoisomerismo
Especificidade por Substrato
Vitamina A/química
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (3,4-dehydroretinol); 0 (4-hydroxy-retinol); 0 (Isoenzymes); 0 (Peptide Fragments); 11103-57-4 (Vitamin A); 6890-93-3 (3-hydroxyretinol); EC 1.14.14.1 (CYP27C1 protein, human); EC 1.14.15.15 (Cytochrome P450 Family 27)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170906
[Lr] Data última revisão:
170906
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170714
[St] Status:MEDLINE
[do] DOI:10.1074/jbc.M116.773937



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