101
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Yu M, Du Y, Jiang W, Chang WL, Yang ST, Tang IC. Effects of different replicons in conjugative plasmids on transformation efficiency, plasmid stability, gene expression and n-butanol biosynthesis in Clostridium tyrobutyricum. Appl Microbiol Biotechnol 2011; 93:881-9. [DOI: 10.1007/s00253-011-3736-y] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2011] [Revised: 10/29/2011] [Accepted: 11/15/2011] [Indexed: 11/30/2022]
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102
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Chojnacka A, Błaszczyk MK, Szczęsny P, Nowak K, Sumińska M, Tomczyk-Żak K, Zielenkiewicz U, Sikora A. Comparative analysis of hydrogen-producing bacterial biofilms and granular sludge formed in continuous cultures of fermentative bacteria. BIORESOURCE TECHNOLOGY 2011; 102:10057-64. [PMID: 21908188 DOI: 10.1016/j.biortech.2011.08.063] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 08/09/2011] [Accepted: 08/10/2011] [Indexed: 05/15/2023]
Abstract
A system for biohydrogen production was developed based on long-term continuous cultures grown on sugar beet molasses in packed bed reactors. In two separate cultures, consortia of fermentative bacteria developed as biofilms on granitic stones. In one of the cultures, a granular sludge was also formed. Metagenomic analysis of the microbial communities by 454-pyrosequencing of amplified 16S rDNA fragments revealed that the overall biodiversity of the hydrogen-producing cultures was quite small. The stone biofilm from the culture without granular sludge was dominated by Clostridiaceae and heterolactic fermentation bacteria, mainly Leuconostocaeae. Representatives of the Leuconostocaeae and Enterobacteriaceae were dominant in both the granules and the stone biofilm formed in the granular sludge culture. The culture containing granular sludge produced hydrogen significantly more effectively than that containing only the stone biofilm: 5.43 vs. 2.8 mol H(2)/mol sucrose from molasses, respectively. The speculations that lactic acid bacteria may favor hydrogen production are discussed.
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Affiliation(s)
- Aleksandra Chojnacka
- Institute of Biochemistry and Biophysics PAS, Pawińskiego 5a, 02-106 Warsaw, Poland
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103
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Zhang Y, Yu M, Yang ST. Effects of ptb knockout on butyric acid fermentation by Clostridium tyrobutyricum. Biotechnol Prog 2011; 28:52-9. [DOI: 10.1002/btpr.730] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2011] [Revised: 07/26/2011] [Indexed: 11/09/2022]
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104
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Huang L, Xiang Y, Cai J, Jiang L, Lv Z, Zhang Y, Xu Z. Effects of three main sugars in cane molasses on the production of butyric acid with Clostridium tyrobutyricum. KOREAN J CHEM ENG 2011. [DOI: 10.1007/s11814-011-0110-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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105
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Mendes FS, González-Pajuelo M, Cordier H, François JM, Vasconcelos I. 1,3-Propanediol production in a two-step process fermentation from renewable feedstock. Appl Microbiol Biotechnol 2011; 92:519-27. [DOI: 10.1007/s00253-011-3369-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Revised: 04/25/2011] [Accepted: 05/04/2011] [Indexed: 12/01/2022]
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106
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Zhu L, Chen H, Huang L, Cai J, Xu Z. Electrochemical analysis of Clostridium propionicum and its acrylic acid production in microbial fuel cells. Eng Life Sci 2011. [DOI: 10.1002/elsc.201000220] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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107
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Song JH, Ventura JRS, Lee CH, Jahng D. Butyric acid production from brown algae using Clostridium tyrobutyricum ATCC 25755. BIOTECHNOL BIOPROC E 2011. [DOI: 10.1007/s12257-010-0177-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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108
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Control and optimization of Clostridium tyrobutyricum ATCC 25755 adhesion into fibrous matrix in a fibrous bed bioreactor. Appl Biochem Biotechnol 2011; 165:98-108. [PMID: 21484272 DOI: 10.1007/s12010-011-9236-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 03/28/2011] [Indexed: 01/09/2023]
Abstract
The great performance of a fibrous bed bioreactor (FBB) is mainly dependent on the cell adhesion and immobilization into the fibrous matrix. Therefore, understanding the mechanism and factors controling cell adhesion in the fibrous matrix is necessary to optimize the FBB setup and further improve the fermentability. The adhesion behavior of a strain of Clostridium tyrobutyricum isolated from an FBB was studied, which was proven to be affected by the different environmental conditions, such as growth phase of cells, pH, ionic strength, ionic species, and composition of media. Our results also suggested that electrostatic interactions played an important role on bacteria adhesion into the fibrous matrix. This study demonstrated that the compositions of fermentation broth would have a significant effect on cell adhesion. Consequently, a two-stage glucose supply control strategy was developed to improve the performance of FBB with higher viable cell density in the operation of the FBB setup.
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109
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Jiang L, Wang J, Liang S, Cai J, Xu Z, Cen P, Yang S, Li S. Enhanced butyric acid tolerance and bioproduction by Clostridium tyrobutyricum immobilized in a fibrous bed bioreactor. Biotechnol Bioeng 2011; 108:31-40. [PMID: 20824675 DOI: 10.1002/bit.22927] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Repeated fed-batch fermentation of glucose by Clostridium tyrobutyricum immobilized in a fibrous bed bioreactor (FBB) was successfully employed to produce butyric acid at a high final concentration as well as to adapt a butyric-acid-tolerant strain. At the end of the eighth fed-batch fermentation, the butyric acid concentration reached 86.9 ± 2.17 g/L, which to our knowledge is the highest butyric acid concentration ever produced in the traditional fermentation process. To understand the mechanism and factors contributing to the improved butyric acid production and enhanced acid tolerance, adapted strains were harvested from the FBB and characterized for their physiological properties, including specific growth rate, acid-forming enzymes, intracellular pH, membrane-bound ATPase and cell morphology. Compared with the original culture used to seed the bioreactor, the adapted culture showed significantly reduced inhibition effects of butyric acid on specific growth rate, cellular activities of butyric-acid-forming enzyme phosphotransbutyrylase (PTB) and ATPase, together with elevated intracellular pH, and elongated rod morphology.
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Affiliation(s)
- Ling Jiang
- School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510640, PR China
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110
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Huang J, Cai J, Wang J, Zhu X, Huang L, Yang ST, Xu Z. Efficient production of butyric acid from Jerusalem artichoke by immobilized Clostridium tyrobutyricum in a fibrous-bed bioreactor. BIORESOURCE TECHNOLOGY 2011; 102:3923-3926. [PMID: 21169015 DOI: 10.1016/j.biortech.2010.11.112] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2010] [Revised: 11/23/2010] [Accepted: 11/24/2010] [Indexed: 05/30/2023]
Abstract
Butyric acid is an important specialty chemical with wide industrial applications. The feasible large-scale fermentation for the economical production of butyric acid requires low-cost substrate and efficient process. In the present study, butyric acid production by immobilized Clostridium tyrobutyricum was successfully performed in a fibrous-bed bioreactor using Jerusalem artichoke as the substrate. Repeated-batch fermentation was carried out to produce butyric acid with a high butyrate yield (0.44 g/g), high productivity (2.75 g/L/h) and a butyrate concentration of 27.5 g/L. Furthermore, fed-batch fermentation using sulfuric acid pretreated Jerusalem artichoke hydrolysate resulted in a high butyric acid concentration of 60.4 g/L, with the yield of 0.38 g/g and the selectivity of ∼ 85.1 (85.1g butyric acid/g acetic acid). Thus, the production of butyric acid from Jerusalem artichoke on a commercial scale could be achieved based on the system developed in this work.
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Affiliation(s)
- Jin Huang
- Institute of Bioengineering, Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
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111
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Cai Y, Lai C, Li S, Liang Z, Zhu M, Liang S, Wang J. Disruption of lactate dehydrogenase through homologous recombination to improve bioethanol production in Thermoanaerobacterium aotearoense. Enzyme Microb Technol 2011; 48:155-61. [DOI: 10.1016/j.enzmictec.2010.10.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2010] [Revised: 08/18/2010] [Accepted: 10/21/2010] [Indexed: 10/18/2022]
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112
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Liu J, Huang J, Sun Z, Zhong Y, Jiang Y, Chen F. Differential lipid and fatty acid profiles of photoautotrophic and heterotrophic Chlorella zofingiensis: assessment of algal oils for biodiesel production. BIORESOURCE TECHNOLOGY 2011; 102:106-10. [PMID: 20591657 DOI: 10.1016/j.biortech.2010.06.017] [Citation(s) in RCA: 204] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 06/01/2010] [Accepted: 06/02/2010] [Indexed: 05/03/2023]
Abstract
The objective of this study was to document and compare the lipid class and fatty acid composition of the green microalga Chlorella zofingiensis cultivated under photoautotrophic and heterotrophic conditions. Compared with photoautotrophic cells, a 900% increase in lipid yield was achieved in heterotrophic cells fed with 30 g L(-1) of glucose. Furthermore heterotrophic cells accumulated predominantly neutral lipids (NL) that accounted for 79.5% of total lipids with 88.7% being triacylglycerol (TAG); whereas photoautotrophic cells contained mainly the membrane lipids glycolipids (GL) and phospholipids (PL). Together with the much higher content of oleic acid (C18:1) (35.2% of total fatty acids), oils from heterotrophic C. zofingiensis appear to be more feasible for biodiesel production. Our study highlights the possibility of using heterotrophic algae for producing high quality biodiesel.
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Affiliation(s)
- Jin Liu
- School of Biological Sciences, The University of Hong Kong, Hong Kong, China
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113
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Molasses as fermentation substrate for levan production by Halomonas sp. Appl Microbiol Biotechnol 2010; 89:1729-40. [DOI: 10.1007/s00253-010-3055-8] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2010] [Revised: 12/01/2010] [Accepted: 12/02/2010] [Indexed: 10/18/2022]
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114
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Song H, Eom MH, Lee S, Lee J, Cho JH, Seung D. Modeling of batch experimental kinetics and application to fed-batch fermentation of Clostridium tyrobutyricum for enhanced butyric acid production. Biochem Eng J 2010. [DOI: 10.1016/j.bej.2010.09.010] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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115
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Liu J, Huang J, Fan KW, Jiang Y, Zhong Y, Sun Z, Chen F. Production potential of Chlorella zofingienesis as a feedstock for biodiesel. BIORESOURCE TECHNOLOGY 2010; 101:8658-63. [PMID: 20615689 DOI: 10.1016/j.biortech.2010.05.082] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 05/20/2010] [Accepted: 05/25/2010] [Indexed: 05/03/2023]
Abstract
The lipid contents and fatty acid profiles of Chlorella zofingiensis cultured in the dark with various carbon sources were investigated. Glucose was found to be the best carbon source for the growth and lipid production. When cultivated with 50gL(-1) glucose, C. zofingiensis accumulated lipids up to 52% of the dry biomass, with triacylglycerols (TAGs) accounting for 72.1% of the total lipids. Fatty acid profiles revealed that glucose contributed to the highest yield of total fatty acids (TFAs) and proportion of oleic acid (35.7% of TFAs), which corresponded to the strongest up-regulation of biotin carboxylase (BC) and stearoyl ACP desaturase (SAD) genes. In fed-batch cultivation based on glucose, the lipid yield and productivity of C. zofingiensis were further increased to 20.7gL(-1) and 1.38gd(-1)L(-1) respectively, representing 3.9-fold of those achieved in batch culture. We conclude that C. zofingiensis has great potential for biodiesel production.
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Affiliation(s)
- Jin Liu
- School of Biological Science, The University of Hong Kong, Hong Kong, China
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116
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WU D, CHEN H, JIANG L, CAI J, XU Z, CEN P. Efficient Separation of Butyric Acid by an Aqueous Two-phase System with Calcium Chloride. Chin J Chem Eng 2010. [DOI: 10.1016/s1004-9541(10)60255-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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117
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High-level expression and efficient purification of bioactive swollenin in Aspergillus oryzae. Appl Biochem Biotechnol 2010; 162:2027-36. [PMID: 20446057 DOI: 10.1007/s12010-010-8978-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2009] [Accepted: 04/25/2010] [Indexed: 10/19/2022]
Abstract
The bioactivity of swollenin is beneficial to cellulose decomposition by cellulase despite the lack of hydrolytic activity itself. In order to improve the productivity of swollenin, the effects of culture conditions on the expression level in recombinant Aspergillus oryzae were investigated systematically. With regard to the bioactivity of swollenin, glycerin and peanut meal were the optimal carbon or nitrogen source, respectively. The highest level production of swollenin (50 mg L(-1)) was attained after 88 h cultivation with the initial pH of 5.6 in the culture medium. Then the soluble swollenin was effectively purified from the cultural supernatant by ammonium sulfate precipitation and cationic exchange chromatography with recovery yield of 53.2%. The purified swollenin was fully bioactive due to its strong synergistic activity with cellulose.
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118
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Repeated-batch production of glucoamylase using recombinant Saccharomyces cerevisiae immobilized in a fibrous bed bioreactor. J Ind Microbiol Biotechnol 2010; 37:773-83. [DOI: 10.1007/s10295-010-0719-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2009] [Accepted: 03/26/2010] [Indexed: 10/19/2022]
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119
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Huang L, Wei P, Zang R, Xu Z, Cen P. High-throughput screening of high-yield colonies of Rhizopus oryzae for enhanced production of fumaric acid. ANN MICROBIOL 2010. [DOI: 10.1007/s13213-010-0039-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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120
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Luo G, Xie L, Zou Z, Wang W, Zhou Q. Evaluation of pretreatment methods on mixed inoculum for both batch and continuous thermophilic biohydrogen production from cassava stillage. BIORESOURCE TECHNOLOGY 2010; 101:959-964. [PMID: 19765981 DOI: 10.1016/j.biortech.2009.08.090] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 08/23/2009] [Accepted: 08/24/2009] [Indexed: 05/28/2023]
Abstract
Anaerobic sludges, pretreated by chloroform, base, acid, heat and loading-shock, as well as untreated sludge were evaluated for their thermophilic fermentative hydrogen-producing characters from cassava stillage in both batch and continuous experiments. Results showed that the highest hydrogen production was obtained by untreated sludge and there were significant differences (p<0.05) in hydrogen yields (varied from 32.9 to 65.3mlH(2)/gVS) among the tested pretreatment methods in batch experiments. However, the differences in hydrogen yields disappeared in continuous experiments, which indicated the pretreatment methods had only short-term effects on the hydrogen production. Further study showed that alkalinity was a crucial parameter influencing the fermentation process. When the influent was adjusted to pH 6 by NaHCO(3) instead of NaOH, the hydrogen yield increased from about 40 to 52mlH(2)/gVS in all the experiments. Therefore, pretreatment of anaerobic sludge is unnecessary for practical thermophilic fermentative hydrogen production from cassava stillage.
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Affiliation(s)
- Gang Luo
- State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China
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121
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Zhang C, Yang H, Yang F, Ma Y. Current progress on butyric acid production by fermentation. Curr Microbiol 2009; 59:656-63. [PMID: 19727942 DOI: 10.1007/s00284-009-9491-y] [Citation(s) in RCA: 116] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2009] [Revised: 07/25/2009] [Accepted: 08/15/2009] [Indexed: 11/28/2022]
Abstract
Several issues of butyric acid production with bacteria through fermentation are presented in this review. The current progress including the utilization of butyric acid, the production strains, the metabolic pathway, and regulation are presented in the paper. Process operation modes such as batch, fed-batch, and continuous fermentation are being discussed. Genetic engineering technologies for microbial strain improvement are also being discussed and fermentation systems have been recommended.
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Affiliation(s)
- Chunhui Zhang
- Key Laboratory of Biofuel, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, China
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