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Critical Reviews™ in Eukaryotic Gene Expression

年間 6 号発行

ISSN 印刷: 1045-4403

ISSN オンライン: 2162-6502

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.6 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 2.2 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00058 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.345 SNIP: 0.46 CiteScore™:: 2.5 H-Index: 67

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Bacterial Expression and Characterization of Recombinant β-Xylosidase from the Thermophilic Xylanolytic Bacterium Bacillus sp

巻 29, 発行 4, 2019, pp. 305-317
DOI: 10.1615/CritRevEukaryotGeneExpr.2019029029
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要約

With the passage of time, energy sources are decreasing day by day. In order to meet the world's demand, much attention is being paid to the study of enzymes with xylanolytic activity as a potential means of generating energy. A thermophilic xylanolytic bacterium, Bacillus sp., was isolated from naturally decaying material by enrichment culture and serial dilution methods. The bacterium was grown in MH medium at 50°C and pH 7 for 10 h. The xylanolytic Bacillus sp. produced clear yellow haloes around the colonies in the presence of p-nitrophenyl beta-D-xylopyranoside (pNPX) as a substrate. After condition optimization, it was found that the organism produced the higher level of xylosidase activity after 14 h in the presence of arabinose as a carbon source and ammonium sulfate as a nitrogen source in the pH 7 medium of at 55°C. The maximum β-xylosidase activity after optimizing the culture condition was 5.0 U/mL. Later this thermophilic Bacillus sp. was used as a donor in cloning of the β-xylosidase gene. A genomic library of Bacillus sp. was prepared by digesting the genomic DNA of the Bacillus with the restriction endonuclease BamHI, ligating the fragments in the pUC18 cloning vector and then transforming the competent E. coli DH5α cells with the resultant chimeric plasmid. The β-xylosidase gene was identified by screening the transformants in duplicates on LB agar plates overlaid with pNPX as a substrate. Commercial production of β-xylosidase to be used as a methanol-producing enzyme can help to overcome fuel shortages.

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