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Jamile Mohammadi Moradian Zi-Ai Xu Yu-Tong Shi Zhen Fang Yang-Chun Yong 《国际能源研究杂志》2020,44(1):325-333
Although xylose is the secondary dominant sugar derived from biomass, the conversion of xylose to energy products is quite challenging. In this work, a new exoelectrogenic yeast strain (Cystobasidium slooffiae strain JSUX1) that can generate electricity in microbial fuel cell (MFC) by using xylose as the substrate was isolated and identified. After adaptation, it produced significant current output with rapid xylose metabolism. More surprisingly, this strain produced hydrogen gas either in anerobic flask incubation or in MFC, which delivered a 67 mW/m2 power output and 23 L/m3 hydrogen gas in MFC with xylose as fuel. Further electrochemical analysis indicated that riboflavin was secreted by this strain as the electron mediator for efficient electron transfer between cells and electrode in MFC. This is the first microorganism identified that can simultaneously produce bio-hydrogen and bio-electricity from xylose, which would diversify the toolbox of biomass energy. 相似文献
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Several papers have reported the advantageous combination of chitosan and ceramic particles for such applications as biomimetic scaffolds, membranes, pollution remediation and gelcasting complex shapes. This work presents a novel gelcasting consolidation mechanism, based on the effects of pH changes on chitosan solubility and zeta potential of alumina particles. Unlike other chitosan-based gelcasting methods, it employs a small content of organic material (lower than 3 wt%) and does not require crosslinking agents (such as glutaraldehyde). With this new method alumina beads with 0.5-1 mm diameter could be produced, whose porosity and specific surface area could be tuned for various applications. 相似文献
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Dr. Francisco Washington A. Barros-Nepomuceno Dr. Daniel de Araújo Viana Dr. Daniel Pascoalino Pinheiro Dr. Fátima de Cássia Evangelista de Oliveira Dr. Jamile Magalhães Ferreira Dr. Maria Goretti R. de Queiroz Dr. Xinghua Ma Dr. Bruno Coêlho Cavalcanti Dr. Claudia Pessoa Prof. Dr. Martin G. Banwell 《ChemMedChem》2021,16(2):420-428
The tambjamines are a small group of bipyrrolic alkaloids that, collectively, display a significant range of biological activities including antitumor, antimicrobial and immunosuppressive properties. The key objective of the present study was to undertake preclinical assessments of tambjamine J (T-J) so as to determine its in vivo antitumor effects. To that end, sarcoma 180 cells were transplanted in mice and the impacts of the title compound then evaluated using a range of protocols including hematological, biochemical, histopathological, genotoxic and clastogenic assays. As a result it was established that this alkaloid has a significant therapeutic window and effectively reduces tumor growth (by 40 % and 79 % at doses of 10 and 20 mg/kg/day, respectively). In this regard it displays similar antitumor activity to the anticancer agent cyclophosphamide and alters animal weight in an analogous manner. 相似文献
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Eunice Valduga Pihetra Oliveira Tatsch Lídia Tiggemann Jamile Zeni Rosicler Colet João Marcos Cansian Helen Treichel Marco Luccio 《International Journal of Food Science & Technology》2009,44(12):2445-2451
This work studied the cultivation conditions for the production of carotenoids by Sporidiobolus salmonicolor (CBS 2636) in a bioreactor. A Plackett–Burman design was used for the screening of the most important factors, followed by a complete second order design, to maximise the concentration of total carotenoids. The maximum concentration of 3425.9 μg L?1 of total carotenoids was obtained in a medium containing 80 g L?1 glucose, 15 g L?1 peptone and 5 g L?1 malt extract, with an aeration rate 1.5 vvm, 180 r.p.m., 25 °C and an initial pH of 4.0. Fermentation kinetics showed that the maximum concentration of total carotenoids was reached after 90 h of fermentation. Carotenoid bio‐production was partially associated with cell growth. The specific carotenoid production (YP/X) was 238 μg carotenoids/g cells, whereas YP/S (substrate to product yield) was 41.3 μg g?1. The specific growth rate (μx) was 0.045 h?1. The highest cell and total carotenoid productivity were 0.19 g L?1 h?1 and 56.9 μg L?1 h?1, respectively. 相似文献
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Pietro Carlos Gonçalves Conceição Paulo Vitor França Lemos Jamile Santos Santana Paulo Romano Cruz Correia Lucas Guimarães Cardoso Denílson de Jesus Assis Lucimar Pacheco Gomes da Rocha Henrique Rodrigues Marcelino Ederlan de Souza Ferreira Jania Betânia Alves da Silva Carolina Oliveira de Souza 《应用聚合物科学杂志》2024,141(17):e55289
Polymer blends can improve material processability and can be used to extrude partially degraded materials, such as expired poly (butylene adipate-co-terephthalate) (PBAT), which cannot be normally extruded. Therefore, in this study, the extrudability of PBAT that has passed its expiration date was restored by blending it with poly (butylene succinate) (PBS). Various polymer blends were extruded and characterized to achieve high-efficiency extrusion. The carbonyl indices in partially degraded PBAT and the corresponding control sample detailed the effects of 98 months of aging on molecular properties. The semicrystalline structure consisted of a mixed ordered arrangement of PBS and PBAT chains dispersed in an amorphous matrix. The microscopic images of the surfaces of the polymer films revealed defects and roughness, followed by an increase in the PBAT concentration in blends. Changes in mechanical properties and water vapor permeability correlated with the PBAT concentration in the blends. To avoid polymer loss, we reported a simple method for using PBAT that has passed its expiration date and cannot be extruded. The results revealed that the polymer films could be used in the packaging industry, especially in food and agricultural sectors. 相似文献
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Marcio V. Reboucas Jamile B. SantosMaria Fernanda Pimentel Leonardo S.G. Teixeira 《Chemometrics and Intelligent Laboratory Systems》2011,107(1):185-193
Alternative methods for quality control in the petroleum industry have been obtained using Near-infrared Spectroscopy (NIRS) combined with multivariate techniques such as PLS (Partial Least-Square). The process of development and refinement of PLS models usually follows a nonsystematic and univariate procedure. The Standard Error of Cross Validation (SECV), the Standard Error of Prediction (SEP) and the determination coefficient (r2regr.) are usually the only guides used in pursuit of the best model. In the present work, a novel approach was proposed using a Doehlert experimental design with three input variables (wavenumber range, preprocessing technique and regression/validation technique) varied at 5, 7 and 3 levels, respectively. Besides SECV, SEP and r2regr., some additional response variables, such as the slope, r2 and pvalue from the external validation, as well as the number of PLS factors, were simultaneously assessed to find the optimum conditions for PLS modeling. The optimum setting for each input variable was simultaneously defined through a multivariate approach using a desirability function. With the proposed approach, the main and interaction effects could also be investigated. The methodology was successfully applied to obtain PLS models to monitor the gasoline quality through the process of product loading in trucks. To prevent product contamination or adulteration, fast prediction of key properties was obtained from FT-NIR spectra within the 7300-3900 cm− 1 region with SECV in the range 0.04-0.63% w/w for composition (Aromatics, Saturates, Olefins and Benzene) and 0.0008 for Relative Density 20/4 °C. Each optimized PLS model was obtained with less than 40 modeling runs, demonstrating the efficiency of the proposed approach. 相似文献
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Maria Marina Serrão Cabral Karine Cence Jamile Zeni Sui Mui Tsai Ademir Durrer Lillian Liva Foltran Geciane Toniazzo Eunice Valduga Helen Treichel 《European Food Research and Technology》2011,233(1):159-166
This work aimed at evaluating the total carotenoids production by a newly isolated Sporidiobolus pararoseus. Bioproduction was carried out in an orbital shaker, using 10% (w/v) of inoculum (25 °C, 180 rpm for 35 h), incubated for
120 h in a dark room. Liquid N2 and dimethylsulphoxide (DMSO) were used for cell rupture, and carotenoids were extracted with a solution of acetone/methanol
(7:3, v/v). Optimization of carotenoids bioproduction was achieved by experimental design technique. Initially, a Plackett–Burman
design was used for the screening of the most important factors, after the statistical analysis, a complete second-order design
was carried out to optimize the concentration of total carotenoids in a conventional medium. Maximum concentration of 856 μg/L
of total carotenoids was obtained in a medium containing 60 g/L of glucose, 15 g/L of peptone, and 15 g/L of malt extract,
25 °C, initial pH 4.0 and 180 rpm. Fermentation kinetics showed that the maximum concentration of total carotenoids was reached
after 102 h of fermentation and that carotenoids bioproduction was associated with cell growth. 相似文献
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Cassava starch‐based nanocomposites reinforced with cellulose nanofibers extracted from sisal
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Jamille Santos Santana Jamile Marques do Rosário Cícero Cardoso Pola Caio Gomide Otoni Nilda de Fátima FerreiraSoares Geany Peruch Camilloto Renato Souza Cruz 《应用聚合物科学杂志》2017,134(12)
Cellulose nanofibers were extracted from sisal and incorporated at different concentrations (0–5%) into cassava starch to produce nanocomposites. Films' morphology, thickness, transparency, swelling degree in water, water vapor permeability (WVP) as well as thermal and mechanical properties were studied. Cellulose nanofiber addition affected neither thickness (56.637 ± 2.939 µm) nor transparency (2.97 ± 1.07 mm?1). WVP was reduced until a cellulose nanofiber content of 3.44%. Tensile force was increased up to a nanocellulose concentration of 3.25%. Elongation was decreased linearly upon cellulose nanofiber addition. Among all films, the greatest Young's modulus was 2.2 GPa. Cellulose nanofibers were found to reduce the onset temperature of thermal degradation, although melting temperature and enthalpy were higher for the nanocomposites. Because cellulose nanofibers were able to improve key properties of the films, the results obtained here can pave the route for the development and large‐scale production of novel biodegradable packaging materials. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44637. 相似文献