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Id: biblio-1056032
Autor: Mamani, Javier Bustamante; Marinho, Bruna Souto; Rego, Gabriel Nery de Albuquerque; Hospital das ClínicasNucci, Mariana Penteado; Alvieri, Fernando; Santos, Ricardo Silva dos; Ferreira, João Victor Matias; Oliveira, Fernando Anselmo de; Gamarra, Lionel Fernel.
Título: Magnetic hyperthermia therapy in glioblastoma tumor on-a-Chip model / Terapia de magneto-hipertermia no modelo de tumor de glioblastoma on-a-Chip
Fonte: Einstein (Säo Paulo);18:eAO4954, 2020. graf.
Idioma: en.
Projeto: CNPq; . FAPESP.
Resumo: ABSTRACT Objective: To evaluate the magnetic hyperthermia therapy in glioblastoma tumor-on-a-Chip model using a microfluidics device. Methods: The magnetic nanoparticles coated with aminosilane were used for the therapy of magnetic hyperthermia, being evaluated the specific absorption rate of the magnetic nanoparticles at 300 Gauss and 305kHz. A preculture of C6 cells was performed before the 3D cells culture on the chip. The process of magnetic hyperthermia on the Chip was performed after administration of 20μL of magnetic nanoparticles (10mgFe/mL) using the parameters that generated the specific absorption rate value. The efficacy of magnetic hyperthermia therapy was evaluated by using the cell viability test through the following fluorescence staining: calcein acetoxymethyl ester (492/513nm), for live cells, and ethidium homodimer-1 (526/619nm) for dead cells dyes. Results: Magnetic nanoparticles when submitted to the alternating magnetic field (300 Gauss and 305kHz) produced a mean value of the specific absorption rate of 115.4±6.0W/g. The 3D culture of C6 cells evaluated by light field microscopy imaging showed the proliferation and morphology of the cells prior to the application of magnetic hyperthermia therapy. Fluorescence images showed decreased viability of cultured cells in organ-on-a-Chip by 20% and 100% after 10 and 30 minutes of the magnetic hyperthermia therapy application respectively. Conclusion: The study showed that the therapeutic process of magnetic hyperthermia in the glioblastoma on-a-chip model was effective to produce the total cell lise after 30 minutes of therapy.

RESUMO Objetivo: Avaliar a terapia de magneto-hipertermia em modelo de tumor de glioblastoma on-a-Chip. Métodos: As nanopartículas magnéticas recobertas com aminosilana foram utilizadas para a terapia da magneto-hipertermia, sendo avaliada a taxa de absorção específica das nanopartículas magnéticas em 300 Gauss e 305kHz. Uma pré-cultura de células C6 foi realizada e, seguidamente, foi feito o cultivo das células 3D no chip. O processo de magneto-hipertermia no chip foi realizado após administração de 20μL de nanopartículas magnéticas (10mgFe/mL), utilizando os parâmetros que geraram o valor da taxa de absorção específica. A eficácia da terapia de magneto-hipertermia foi avaliada pela viabilidade celular por meio dos corantes fluorescentes acetoximetiléster de calceína (492/513nm), para células vivas, e etídio homodímero-1 (526/619nm), para células mortas. Resultados: As nanopartículas magnéticas, quando submetidas ao campo magnético alternado (300 Gauss e 305kHz), produziram um valor médio da taxa de absorção específica de 115,4±6,0W/g. A cultura 3D das células C6 avaliada por imagem de microscopia de campo claro mostrou a proliferação e a morfologia das células antes da aplicação da terapia de magneto-hipertermia. As imagens de fluorescência mostraram diminuição da viabilidade das células cultivadas no organ-on-a-Chip em 20% e 100% após 10 e 30 minutos, respectivamente, da aplicação da terapia de magneto-hipertermia. Conclusão: O processo terapêutico da magneto-hipertermia no modelo de tumor glioblastoma on-a-chip foi eficaz para produzir lise total das células após 30 minutos de terapia.
Descritores: Glioblastoma/terapia
Técnicas de Cultura de Células/métodos
Dispositivos Lab-On-A-Chip
Nanopartículas de Magnetita/uso terapêutico
Hipertermia Induzida/métodos
-Temperatura
Fatores de Tempo
Sobrevivência Celular
Reprodutibilidade dos Testes
Resultado do Tratamento
Linhagem Celular Tumoral
Campos Magnéticos
Fluorescência
Limites: Animais
Ratos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Id: biblio-1022849
Autor: Cabral Terrone, Cárol; Freitas, Caroline de; Fanchini Terrasan, César Rafael; Almeida, Alex Fernando de; Cano Carmona, Eleonora.
Título: Agroindustrial biomass for xylanase production by Penicillium chrysogenum: purification, biochemical properties and hydrolysis of hemicelluloses
Fonte: Electron. j. biotechnol;33:39-45, May. 2018. tab, graf, ilus.
Idioma: en.
Projeto: National Council of Technological and Scientific Development (CNPq); . São Paulo Research Foundation FAPESP/Brazil.
Resumo: Background: In this work, the xylanase production by Penicillium chrysogenum F-15 strain was investigated using agroindustrial biomass as substrate. The xylanase was purified, characterized and applied in hemicellulose hydrolysis. Results: The highest xylanase production was obtained when cultivation was carried out with sugar cane bagasse as carbon source, at pH 6.0 and 20°C, under static condition for 8 d. The enzyme was purified by a sequence of ion exchange and size exclusion chromatography, presenting final specific activity of 834.2 U·mg·prot-1. T he molecular mass of the purified enzyme estimated by SDS-PAGE was 22.1 kDa. The optimum activity was at pH 6.5 and 45°C. The enzyme was stable at 40°C with half-life of 35 min, and in the pH range from 4.5 to 10.0. The activity was increased in the presence of Mg+2 and Mn+2 and reducing agents such as DTT and ßmercaptoethanol, but it was reduced by Cu+2 and Pb+2 . The xylanase presented Km of 2.3 mM and Vmax of 731.8 U·mg·prot-1 with birchwood xylan as substrate. This xylanase presented differences in its properties when it was compared to the xylanases from other P. chrysogenum strains. Conclusion: The xylanase from P. chrysogenum F-15 showed lower enzymatic activity on commercial xylan than on hemicellulose from agroindustry biomass and its biochemistry characteristics, such as stability at 40°C and pH from 4.0 to 10.0, shows the potential of this enzyme for application in food, feed, pulp and paper industries and for bioethanol production.
Descritores: Penicillium chrysogenum/metabolismo
Polissacarídeos/metabolismo
Endo-1,4-beta-Xilanases/biossíntese
-Temperatura
Estabilidade Enzimática
Biomassa
Endo-1,4-beta-Xilanases/isolamento & purificação
Eletroforese em Gel de Poliacrilamida
Concentração de Íons de Hidrogênio
Hidrólise
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1286302
Autor: Guerra, Larissa Pereira; Andrade, Larissa Martins Vieira de; Joner, Daiany Caroline; Strozzi, Daniel.
Título: Home measures against low air humidity which may alleviate health problems / Medidas caseiras contra baixa umidade do ar amenizam agravos na saúde
Fonte: Einstein (Säo Paulo);19:eAO5484, 2021. tab, graf.
Idioma: en.
Resumo: ABSTRACT Objective Humidity and temperature are fundamental for the balance in the life cycle of living beings and, consequently, for maintaining the well-being of the human population and reducing the prevalence of infectious diseases. Thus, in order to mitigate the impact of climate change, especially in the period when humidity is not the ideal, it is necessary to adopt some assistance measures. The present experimental study aims to elucidate what would be the recommended option to improve the quality of life of the human being and to clarify which resources (air humidifier, bucket of water or wet towel) will be effective to improve the humidity of the air in times of drought and low moisture. Methods The experimental study was carried out with INKBIRD hygrometers allowing the analysis of the variation of air humidity throughout the day. Three forms of treatment were established: humidifier, wet towel and bucket of water. In each room, two hygrometers were placed equidistant from the occupant of the room and their respective treatment that varied between 1m and 2m away from the headboard indoor each room. In addition, two environments were used as controls, one being an external environment and the other an internal closed environment, totaling five rooms for the study. The rooms were monitored between the end of July and the end of August 2019 in Goiania (GO). Results Although assistance measures are used to significantly improve air pollution in times of extreme drought, there was a significant difference between them. The humidifier and a wet towel had 7.50% and 5.71% more humidity in the external relation (external control), respectively, more efficient. The volume of water, however, did not show significant difference (p>0.05) and, therefore, there was no variation. Conclusion The humidifier and the towel are treatments considered more efficient, and that there was a significant effect of distance on humidity. Therefore, 1m of distance is more efficient in increasing and/or maintaining air humidity, inducing improvements in the populations' health.

RESUMO Objetivo A umidade e a temperatura são fundamentais para o equilíbrio no ciclo da vida dos seres vivos e, consequentemente, para manter o bem-estar da população humana e diminuir a prevalência de doenças infecciosas. Visando mitigar o impacto das alterações climáticas, principalmente no período em que a umidade não é a ideal, é preciso adotar algumas medidas assistencialistas. O presente estudo visa elucidar qual seria a opção mais indicada para melhorar a qualidade de vida do ser humano e esclarecer qual melhor recurso (umidificador de ar, balde com água ou toalha molhada) é eficaz para melhorar a umidade do ar em épocas de seca e baixa umidade. Métodos Estudo experimental realizado com higrômetros INKBIRD que permitiram a análise da variação da umidade do ar ao longo do dia. Foram estabelecidas três formas de tratamento: umidificador, toalha molhada e balde com água. Em cada quarto, foram colocados dois higrômetros equidistantes do ocupante do quarto e seu respectivo tratamento, que variava entre 1m e 2m de distância da cabeceira da cama dentro de cada cômodo. Além disso, dois ambientes foram utilizados como controle, sendo um externo e outro fechado interno, totalizando cinco cômodos para o estudo. Os cômodos foram monitorados entre o final do mês de julho até final do mês de agosto de 2019 em Goiânia (GO). Resultados Apesar de as medidas assistencialistas serem utilizadas para melhora significativa da umidade do ar em épocas de extrema seca, há uma diferença significativa entre elas. O umidificador e a toalha molhada possuíram 7,50% e 5,71% a mais de umidade em relação à área externa (controle externo), respectivamente, sendo considerados mais eficientes. Já o balde de água não se diferenciou significativamente (p>0,05), não havendo variação. Conclusão O umidificador e a toalha foram os tratamentos considerados mais eficientes, com efeito significativo da distância sobre a umidade. Portanto, 1m de distância é mais eficiente no aumento e/ou na manutenção da umidade do ar, induzindo melhorias na saúde da população.
Descritores: Qualidade de Vida
Água
-Temperatura
Umidade
Limites: Humanos
Responsável: BR1.1 - BIREME


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Id: biblio-1045993
Autor: Zeeshan, Nadia; Naz, Saher; Naz, Shumaila; Afroz, Amber; Zahur, Muzna; Zia, Safia.
Título: Heterologous expression and enhanced production of ß-1, 4-glucanase of Bacillus halodurans C-125 in Escherichia coli
Fonte: Electron. j. biotechnol;34:29-36, july. 2018. ilus, tab, graf.
Idioma: en.
Projeto: Higher Education Commission, Pakistan (HEC).
Resumo: Background: Recombinant DNA technology enables us to produce proteins with desired properties and insubstantial amount for industrial applications. Endo-1, 4-ß-glucanases (Egl) is one of the major enzyme involved in degradation of cellulose, an important component of plant cell wall. The present study was aimed at enhancing the production of endo-1, 4-ß-glucanases (Egl) of Bacillus halodurans in Escherichia coli. Results: A putative Egl gene of Bacillus Halodurans was expressed in E. coli by cloning in pET 22b (+). On induction with isopropyl-b-D-1-thiogalactopyranoside, the enzyme expression reached upto ~20% of the cell protein producing 29.2 mg/liter culture. An increase in cell density to 12 in auto-inducing LB medium (absorbance at 600 nm) enhanced ß-glucanase production up to 5.4 fold. The molecular mass of the enzyme was determined to be 39 KDa, which is nearly the same as the calculated value. Protein sequence was analyzed by CDD, Pfam, I TASSER, COACH, PROCHECK Servers and putative amino acids involved in the formation of catalytic, substrate and metal binding domains were identified. Phylogenetic analysis of the ß-glucanases of B. halodurans was performed and position of Egl among other members of the genus Bacillus producing endo-glucanases was determined. Temperature and pH optima of the enzyme were found to be 60°C and 8.0, respectively, under the assay conditions. Conclusion: Production of endo-1, 4 ß-glucanase enzymes from B. halodurans increased several folds when cloned in pET vector and expressed in E. coli. To our knowledge, this is the first report of high-level expression and characterization of an endo-1, 4 ß-glucanases from B. halodurans.
Descritores: Bacillus/enzimologia
Celulases/biossíntese
-Temperatura
Estabilidade Enzimática
Expressão Gênica
Parede Celular/enzimologia
Reação em Cadeia da Polimerase
Clonagem Molecular
Celulases/isolamento & purificação
Celulases/metabolismo
Escherichia coli/metabolismo
Células Vegetais/enzimologia
Concentração de Íons de Hidrogênio
Hidrólise
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1047365
Autor: González-Torres, Maykel; Sánchez-Sánchez, Roberto; Solís-Rosales, Silvia G; Brostow, Witold; Reyes-Cervantes, Eric; Gutiérrez-Uribe, Janet Alejandra; Silva-Bermúdez, Phaedra; Moyaho-Bernal, María de los Angeles; Velasquillo-Martínez, María Cristina.
Título: Poly(3-hydroxybutyrate) graft copolymer dense membranes for human mesenchymal stem cell growth
Fonte: Electron. j. biotechnol;34:59-66, july. 2018. graf, tab, ilus.
Idioma: en.
Resumo: Background: The use of novel materials as an artificial extracellular matrix for stem cell growth is a current strategy of increasing interest for regenerative medicine. Here, we prepare thermal-remolded membrane scaffolds from poly(3-hydroxybutyrate) grafted with 2-amino-ethyl methacrylate hydrochloride. However, it is unclear whether these membranes are useful for tissue engineering. Results: The mechanical properties, tribology, and morphology of the dense membranes were assessed. The results show that tensile strain at break and roughness of the compressed membrane decrease with increasing graft degree. Moreover, graft copolymer membranes showed lower resistance to scratching, greater degree of swelling and higher brittleness than un-grafted P(3HB) films. Thus, it effectively supports the growth of dermal fibroblast, as demonstrated by epifluorescence microscopy. Conclusions: It is concluded that the developed membrane can be properly used in is the restoration of skin tissue. How to cite: González-Torres M, Sánchez-Sánchez R, Solís-Rosales SG, et al. Poly(3-hydroxybutyrate) graft copolymer dense membranes for human mesenchymal stem cell growth.
Descritores: Células-Tronco Mesenquimais/fisiologia
Membranas Artificiais
-Temperatura
Medicina Regenerativa
Crescimento
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1047375
Autor: Li, Shanshan; Qin, Kun; Li, Huaying; Guo, Jin; Li, Dejin; Liu, Fang; Tan, Zhilei; Yan, Wei; Qu, Shuling; Zhao, Huabing.
Título: Cloning and characterisation of four catA genes located on the chromosome and large plasmid of Pseudomonas putida ND6
Fonte: Electron. j. biotechnol;34:83-90, july. 2018. tab, ilus, graf.
Idioma: en.
Projeto: Tianjin Research Program of Application Foundation and Advanced Technology; . National Natural Science Foundation of China.
Resumo: Background: Although the functional redundancy of catechol 1,2-dioxygenase (C12O) genes has been reported in several microorganisms, limited enzymes were characterised, let alone the advantage of the coexistence of the multiple copies of C12O genes. Results: In this study, four novel C12O genes, designated catA, catAI, catAII and catAIII, in the naphthalene-degrading strain Pseudomonas putida ND6, were cloned and characterised. Phylogenetic analysis of their deduced amino acid sequences revealed that the four C12O isozymes each formed independent subtrees, together with homologues from other organisms. All four enzymes exhibited maximum activity at pH 7.4 and higher activity in alkaline than in acidic conditions. Furthermore, CatA, CatAI and CatAIII were maximally active at a temperature of 45°C, whereas a higher optimum temperature was observed for CatAII at a temperature of 50°C. CatAI exhibited superior temperature stability compared with the other three C12O isozymes, and kinetic analysis indicated similar enzyme activities for CatA, CatAI and CatAII, whereas that of CatAIII was lower. Significantly, among metal ions tested, only Cu2+ substantially inhibited the activity of these C12O isozymes, thus indicating that they have potential to facilitate bioremediation in environments polluted with aromatics in the presence of metals. Moreover, gene expression analysis at the mRNA level and determination of enzyme activity clearly indicated that the redundancy of the catA genes has increased the levels of C12O. Conclusion: The results clearly imply that the redundancy of catA genes increases the available amount of C12O in P. putida ND6, which would be beneficial for survival in challenging environments.
Descritores: Pseudomonas putida/enzimologia
Pseudomonas putida/genética
Catecol 1,2-Dioxigenase/genética
-Temperatura
Biodegradação Ambiental
Clonagem Molecular
Catecol 1,2-Dioxigenase/análise
Catecol 1,2-Dioxigenase/metabolismo
Genes Bacterianos
Concentração de Íons de Hidrogênio
Isoenzimas
Metais
Responsável: CL1.1 - Biblioteca Central


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Id: lil-720240
Autor: Pinzón, Alfredo.
Título: ¿Álgido o Álgico? / Algidus or algic?
Fonte: Acta méd. colomb;39(2):218-218, abr.-jun. 2014. ilus.
Idioma: es.
Resumo: Con alguna frecuencia se escucha en medicina el vocablo álgido pretendiendo referirse al aspecto adolorido o quejumbroso de un paciente. No obstante, ese es un uso equivocado para este término ya que existe un adjetivo específico para definir esa situación: álgico. Aunque las dos palabras son similares, poseen significados diferentes
Descritores: Dor
Temperatura
-Pacientes
Dicionário
Medicina
Responsável: CO70 - Asociación Colombiana de Medicina Interna


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Id: biblio-1283600
Autor: Oestreich, Arne Michael; Ilire Suli, Merlinda; Gerlach, Doreen; Fan, Rong; Czermak, Peter.
Título: Media development and process parameter optimization using statistical experimental designs for the production of nonribosomal peptides in Escherichia coli
Fonte: Electron. j. biotechnol;52:85-92, July. 2021. graf, tab.
Idioma: en.
Resumo: BACKGROUND: Nonribosomal peptide synthases (NRPS) can synthesize functionally diverse bioactive peptides by incorporating nonproteinogenic amino acids, offering a rich source of new drug leads. The bacterium Escherichia coli is a well-characterized production host and a promising candidate for the synthesis of nonribosomal peptides, but only limited bioprocess engineering has been reported for such molecules. We therefore developed a medium and optimized process parameters using the design of experiments (DoE) approach. RESULTS: We found that glycerol is not suitable as a carbon source for rhabdopeptide production, at least for the NRPS used for this study. Alternative carbon sources from the tricarboxylic acid cycle achieved much higher yields. DoE was used to optimize the pH and temperature in a stirred-tank reactor, revealing that optimal growth and optimal production required substantially different conditions. CONCLUSIONS: We developed a chemically defined adapted M9 medium matching the performance of complex medium (lysogeny broth) in terms of product concentration. The maximum yield in the reactor under optimized conditions was 126 mg L-1, representing a 31-fold increase compared to the first shaking-flask experiments with M9 medium and glycerol as the carbon source. Conditions that promoted cell growth tended to inhibit NRPS productivity. The challenge was therefore to find a compromise between these factors as the basis for further process development.
Descritores: Peptídeo Sintases/metabolismo
Reatores Biológicos/microbiologia
Escherichia coli
-Temperatura
Biotecnologia
Carbono/metabolismo
Modelos Estatísticos
Eletroforese em Gel de Poliacrilamida
Bioengenharia
Concentração de Íons de Hidrogênio
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1224608
Autor: Ungcharoenwiwat, Pakpimol; H-Kittikun, Aran.
Título: Enzymatic synthesis of coconut oil based wax esters by immobilized lipase EQ3 and commercial lipozyme RMIM
Fonte: Electron. j. biotechnol;47:10-16, sept. 2020. graf, tab.
Idioma: en.
Projeto: Institute of Research and Innovation, Walailak University.
Resumo: BACKGROUND: Liquid wax esters are widely used in cosmetic as well as pharmaceutical and other industries. The demand of organic and natural products is increasing nowadays. Coconut oil contains benefit fatty acids and has been mainly used for oil-based and moisturizer products. Liquid wax esters from coconut oil and unsaturated fatty alcohol can be synthesized by enzymatic reaction; and it is interesting for using as an alternative natural ingredient in these industries. RESULTS: Optimal condition for coconut oil based wax ester synthesis by immobilized lipase EQ3 was 10 U of enzyme, temperature at 30°C and molar ratio of coconut oil to oleyl alcohol at 1:3 (mol/mol) (0.33X) dissolved in isooctane for 12 h, while for Lipozyme RM IM optimal condition was 10 U of enzyme, temperature at 45°C and oil/alcohol molar ratio at 1:3 (0.33X) dissolved in isooctane for 3 h. Percentage of wax esters synthesized by both lipases reached more than 88%. Both immobilized lipases catalyzed high yield of wax esters within the 2nd batch; after that, the immobilized lipases showed reduced activity and synthesized b60% of wax esters from the 3rd to 5th batch. The main composition of wax esters was ~48% oleyl laurate with 10% degradation at ~250°C. CONCLUSIONS: The liquid wax ester synthesis by commercial Lipozyme RM IM had higher effect than immobilized lipase EQ3, but both catalysts were stable within 2 batches in the optimum condition. The characteristic properties of wax esters showed potential for use as components in cosmetics and skin care products.
Descritores: Ceras
Ésteres/metabolismo
Óleo de Palmeira/síntese química
Lipase/metabolismo
-Temperatura
Enzimas Imobilizadas
Indústria Cosmética
Responsável: CL1.1 - Biblioteca Central


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Id: biblio-1253097
Autor: Wang, Longxing; Zhu, Wenjun; Gao, Zhen; Zhou, Hua; Cao, Fei; Jiang, Min; Li, Yan; Jia, Honghua; Wei, Ping.
Título: Biosynthetic L-tert-leucine using Escherichia coli co-expressing a novel NADH-dependent leucine dehydrogenase and a formate dehydrogenase
Fonte: Electron. j. biotechnol;47:83-88, sept. 2020. graf, ilus.
Idioma: en.
Projeto: National Key Research and Development Program of China.
Resumo: BACKGROUND: L-tert-Leucine has been widely used in pharmaceutical, chemical, and other industries as a vital chiral intermediate. Compared with chemical methods, enzymatic methods to produce L-tert-leucine have unparalleled advantages. Previously, we found a novel leucine dehydrogenase from the halophilic thermophile Laceyella sacchari (LsLeuDH) that showed good thermostability and great potential for the synthesis of L-tertleucine in the preliminary study. Hence, we manage to use the LsLeuDH coupling with a formate dehydrogenase from Candida boidinii (CbFDH) in the biosynthesis of L-tert-leucine through reductive amination in the present study. RESULT: The double-plasmid recombinant strain exhibited higher conversion than the single-plasmid recombinant strain when resting cells cultivated in shake flask for 22 h were used. Under the optimized conditions, the double-plasmid recombinant E. coli BL21 (pETDute-FDH-LDH, pACYCDute-FDH) transformed 1 mol·L-1 trimethylpyruvate (TMP) completely into L-tert-leucine with greater than 99.9% ee within 8 h. CONCLUSIONS: The LsLeuDH showed great ability to biosynthesize L-tert-leucine. In addition, it provided a new option for the biosynthesis of L-tert-leucine.
Descritores: Leucina Desidrogenase/metabolismo
Bacillales/enzimologia
Leucina/biossíntese
-Temperatura
Proteínas Recombinantes
Escherichia coli
Concentração de Íons de Hidrogênio
Responsável: CL1.1 - Biblioteca Central



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