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Ghadiri E, Naghavi NS, Ghaedi K. Molecular cloning and characterizing of Bacillus subtilis cellulase collected from central-northern Iran forests. GENE REPORTS 2020. [DOI: 10.1016/j.genrep.2020.100772] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Pennerman KK, Gonzalez J, Chenoweth LR, Bennett JW, Yin G, Hua SST. Biocontrol strain Aspergillus flavus WRRL 1519 has differences in chromosomal organization and an increased number of transposon-like elements compared to other strains. Mol Genet Genomics 2018; 293:1507-1522. [DOI: 10.1007/s00438-018-1474-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 07/10/2018] [Indexed: 12/14/2022]
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3
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Isaac GS, Abu-Tahon MA. Enhanced alkaline cellulases production by the thermohalophilic Aspergillus terreus AUMC 10138 mutated by physical and chemical mutagens using corn stover as substrate. Braz J Microbiol 2016; 46:1269-77. [PMID: 26691490 PMCID: PMC4704614 DOI: 10.1590/s1517-838246420140958] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Accepted: 05/06/2015] [Indexed: 11/22/2022] Open
Abstract
A thermohalophilic fungus, Aspergillus terreus AUMC 10138, isolated
from the Wadi El-Natrun soda lakes in northern Egypt was exposed successively to
gamma and UV-radiation (physical mutagens) and ethyl methan-sulfonate (EMS; chemical
mutagen) to enhance alkaline cellulase production under solid state fermentation
(SSF) conditions. The effects of different carbon sources, initial moisture,
incubation temperature, initial pH, incubation period, inoculum levels and different
concentrations of NaCl on production of alkaline filter paper activity (FPase),
carboxymethyl cellulase (CMCase) and β-glucosidase by the wild-type and mutant
strains of A. terreus were evaluated under SSF. The optimum
conditions for maximum production of FPase, CMCase and β-glucosidase were found to be
the corn stover: moisture ratio of 1:3(w/v), temperature 45 °C, pH range, 9.0–11.0,
and fermentation for 4, 4 and 7 day, respectively. Inoculum levels of 30% for
β-glucosidase and 40% for FPase, CMCase gave the higher cellulase production by the
wild-type and mutant strains, respectively. Higher production of all three enzymes
was obtained at a 5% NaCl. Under the optimized conditions, the mutant strain
A. terreus M-17 produced FPase (729 U/g), CMCase (1,783 U/g), and
β-glucosidase (342 U/g), which is, 1.85, 1.97 and 2.31-fold higher than the wild-type
strain. Our results confirmed that mutant strain M-17 could be a promising alkaline
cellulase enzyme producer employing lignocellulosics especially corn stover.
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Affiliation(s)
- George Saad Isaac
- Biological and Geological Sciences Department, Faculty of Education, Ain Shams University, Cairo, Egypt
| | - Medhat Ahmed Abu-Tahon
- Biological and Geological Sciences Department, Faculty of Education, Ain Shams University, Cairo, Egypt
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Sebayang AH, Masjuki HH, Ong HC, Dharma S, Silitonga AS, Mahlia TMI, Aditiya HB. A perspective on bioethanol production from biomass as alternative fuel for spark ignition engine. RSC Adv 2016. [DOI: 10.1039/c5ra24983j] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The increasing fuel consumption of fossil fuels has led to the development of alternative fuels for the future.
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Affiliation(s)
- A. H. Sebayang
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - H. H. Masjuki
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Hwai Chyuan Ong
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - S. Dharma
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - A. S. Silitonga
- Department of Mechanical Engineering
- Faculty of Engineering
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - T. M. I. Mahlia
- Department of Mechanical Engineering
- Universiti Tenaga Nasional
- 43000 Kajang
- Malaysia
| | - H. B. Aditiya
- Department of Mechanical Engineering
- Universiti Tenaga Nasional
- 43000 Kajang
- Malaysia
- Department of Mechanical Engineering
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Faseleh Jahromi M, Liang JB, Mohamad R, Goh YM, Shokryazdan P, Ho YW. Lovastatin-enriched rice straw enhances biomass quality and suppresses ruminal methanogenesis. BIOMED RESEARCH INTERNATIONAL 2013; 2013:397934. [PMID: 23484116 PMCID: PMC3581142 DOI: 10.1155/2013/397934] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Revised: 12/22/2012] [Accepted: 12/28/2012] [Indexed: 01/08/2023]
Abstract
The primary objective of this study was to test the hypothesis that solid state fermentation (SSF) of agro-biomass (using rice straw as model); besides, breaking down its lignocellulose content to improve its nutritive values also produces lovastatin which could be used to suppress methanogenesis in the rumen ecosystem. Fermented rice straw (FRS) containing lovastatin after fermentation with Aspergillus terreus was used as substrate for growth study of rumen microorganisms using in vitro gas production method. In the first experiment, the extract from the FRS (FRSE) which contained lovastatin was evaluated for its efficacy for reduction in methane (CH4) production, microbial population, and activity in the rumen fluid. FRSE reduced total gas and CH4 productions (P < 0.01). It also reduced (P < 0.01) total methanogens population and increased the cellulolytic bacteria including Ruminococcus albus, Fibrobacter succinogenes (P < 0.01), and Ruminococcus flavefaciens (P < 0.05). Similarly, FRS reduced total gas and CH4 productions, methanogens population, but increased in vitro dry mater digestibility compared to the non-fermented rice straw. Lovastatin in the FRSE and the FRS significantly increased the expression of HMG-CoA reductase gene that produces HMG-CoA reductase, a key enzyme for cell membrane production in methanogenic Archaea.
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Affiliation(s)
| | - Juan Boo Liang
- Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Rosfarizan Mohamad
- Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Yong Meng Goh
- Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Parisa Shokryazdan
- Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
| | - Yin Wan Ho
- Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
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6
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Lovastatin production by Aspergillus terreus using agro-biomass as substrate in solid state fermentation. J Biomed Biotechnol 2012; 2012:196264. [PMID: 23118499 PMCID: PMC3478940 DOI: 10.1155/2012/196264] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2012] [Revised: 07/02/2012] [Accepted: 07/02/2012] [Indexed: 11/18/2022] Open
Abstract
Ability of two strains of Aspergillus terreus (ATCC 74135 and ATCC 20542) for production of lovastatin in solid state fermentation (SSF) using rice straw (RS) and oil palm frond (OPF) was investigated. Results showed that RS is a better substrate for production of lovastatin in SSF. Maximum production of lovastatin has been obtained using A. terreus ATCC 74135 and RS as substrate without additional nitrogen source (157.07 mg/kg dry matter (DM)). Although additional nitrogen source has no benefit effect on enhancing the lovastatin production using RS substrate, it improved the lovastatin production using OPF with maximum production of 70.17 and 63.76 mg/kg DM for A. terreus ATCC 20542 and A. terreus ATCC 74135, respectively (soybean meal as nitrogen source). Incubation temperature, moisture content, and particle size had shown significant effect on lovastatin production (P < 0.01) and inoculums size and pH had no significant effect on lovastatin production (P > 0.05). Results also have shown that pH 6, 25°C incubation temperature, 1.4 to 2 mm particle size, 50% initial moisture content, and 8 days fermentation time are the best conditions for lovastatin production in SSF. Maximum production of lovastatin using optimized condition was 175.85 and 260.85 mg/kg DM for A. terreus ATCC 20542 and ATCC 74135, respectively, using RS as substrate.
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Isolation and characterization of a fungus Aspergillus sp. strain F-3 capable of degrading alkali lignin. Biodegradation 2011; 22:1017-27. [DOI: 10.1007/s10532-011-9460-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2010] [Accepted: 02/10/2011] [Indexed: 11/26/2022]
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Mirzaakhmedov SY, Ruzmetova DT, Berdiev NS, Salikhov SI. Identification of the amino-acid composition of cellulolytic enzymes by a phenylthiocarbamoyl method. Chem Nat Compd 2011. [DOI: 10.1007/s10600-011-9814-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Michaelsen A, Piñar G, Pinzari F. Molecular and microscopical investigation of the microflora inhabiting a deteriorated Italian manuscript dated from the thirteenth century. MICROBIAL ECOLOGY 2010; 60:69-80. [PMID: 20449583 PMCID: PMC2917558 DOI: 10.1007/s00248-010-9667-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 03/12/2010] [Indexed: 05/07/2023]
Abstract
This case study shows the application of nontraditional diagnostic methods to investigate the microbial consortia inhabiting an ancient manuscript. The manuscript was suspected to be biologically deteriorated and SEM observations showed the presence of fungal spores attached to fibers, but classic culturing methods did not succeed in isolating microbial contaminants. Therefore, molecular methods, including PCR, denaturing gradient gel electrophoresis (DGGE), and clone libraries, were used as a sensitive alternative to conventional cultivation techniques. DGGE fingerprints revealed a high biodiversity of both bacteria and fungi inhabiting the manuscript. DNA sequence analysis confirmed the existence of fungi and bacteria in manuscript samples. A number of fungal clones identified on the manuscript showed similarity to fungal species inhabiting dry or saline environments, suggesting that the manuscript environment selects for osmophilic or xerophilic fungal species. Most of the bacterial sequences retrieved from the manuscript belong to phylotypes with cellulolytic activities.
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Affiliation(s)
- Astrid Michaelsen
- Department of Microbial Ecology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Guadalupe Piñar
- Institute of Applied Microbiology, Department of Biotechnology, University of Natural Resources and Applied Life Sciences, Muthgasse 18, 1190 Vienna, Austria
| | - Flavia Pinzari
- Laboratorio di Biologia, Ministero per i Beni e le Attività Culturali, ICPAL - Istituto Centrale per il Restauro e la Conservazione del Patrimonio Archivistico e Librario, Via Milano, 76, 00184 Rome, Italy
- Dept. of Plant Biology, School in Ecological Sciences, Sapienza University of Rome, Rome, Italy
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Gao J, Weng H, Zhu D, Yuan M, Guan F, Xi Y. Production and characterization of cellulolytic enzymes from the thermoacidophilic fungal Aspergillus terreus M11 under solid-state cultivation of corn stover. BIORESOURCE TECHNOLOGY 2008; 99:7623-9. [PMID: 18346891 DOI: 10.1016/j.biortech.2008.02.005] [Citation(s) in RCA: 145] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2007] [Revised: 02/03/2008] [Accepted: 02/05/2008] [Indexed: 05/16/2023]
Abstract
The production of extracellular cellulases by a newly isolated thermoacidophilic fungus, Aspergillus terreus M11, on the lignocellulosic materials was studied in solid-state fermentation (SSF). The results showed that the high-level cellulase activity was produced at 45 degrees C pH 3 and moisture 80% with corn stover and 0.8% yeast extract as carbon and nitrogen sources. 581 U endoglucanase activity, 243 U filter paper activity and 128 U beta-glucosidase activity per gram of carbon source were obtained in the optimal condition. Endoglucanase and beta-glucosidase exhibited their maximum activity at pH 2 and pH 3, respectively, and both of them showed remarkable stability in the range of pH 2-5. The activities of endoglucanase and beta-glucosidase were up to the maximum at 70 degrees C and maintained about 65% and 53% of their original activities after incubation at 70 degrees C for 6h. The enzyme preparations from this strain were used to hydrolyze Avicel. Higher hydrolysis yields of Avicel were up to 63% on 5% Avicel (w/v) for 72 h with 20 U FPase/g substrate.
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Affiliation(s)
- Jianmin Gao
- Department of Bioengineering, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, PR China
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Svobodová K, Majcherczyk A, Novotný C, Kües U. Implication of mycelium-associated laccase from Irpex lacteus in the decolorization of synthetic dyes. BIORESOURCE TECHNOLOGY 2008; 99:463-71. [PMID: 17369037 DOI: 10.1016/j.biortech.2007.01.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2006] [Revised: 01/19/2007] [Accepted: 01/22/2007] [Indexed: 05/14/2023]
Abstract
The white rot fungus Irpex lacteus is able to decolorize such synthetic dyes as Reactive Orange 16 and Remazol Brilliant Blue R. Here, we demonstrate that this type of dye decolorization is mainly related to a laccase-like enzyme activity associated with fungal mycelium. In its bound form, the enzyme detected showed a pH optimum of 3.0 for the oxidation of ABTS, DMP and guaiacol, and a pH of 7.0 for syringaldazine. The highest enzymatic activity was obtained with ABTS as substrate. Enzyme activity was fully inhibited with 50mM NaN(3). Depending on the chemical structure of dyes, redox mediators had a positive effect on the dye decolorization by fungal mycelium. Enzyme isolated from fungal mycelium was able to decolorize synthetic dyes in vitro.
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Affiliation(s)
- K Svobodová
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Videnska 1083, 142 20 Prague, Czech Republic.
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Gao J, Weng H, Xi Y, Zhu D, Han S. Purification and characterization of a novel endo-beta-1,4-glucanase from the thermoacidophilic Aspergillus terreus. Biotechnol Lett 2007; 30:323-7. [PMID: 17928959 DOI: 10.1007/s10529-007-9536-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2007] [Revised: 09/04/2007] [Accepted: 09/04/2007] [Indexed: 11/29/2022]
Abstract
An endo-beta-1,4-glucanase from a thermoacidophilic fungus, Aspergillus terreus M11, was purified 18-fold with 14% yield and a specific activity of 67 U mg(-1) protein. The optimal pH was 2 and the cellulase was stable from pH 2 to 5. The cellulase had a temperature optimum of 60 degrees C measured over 30 min and retained more than 60% of its activity after heating at 70 degrees C for 1 h. The molecular mass of the cellulase was about 25 kDa. Its activity was inhibited by 77% by Hg(2+) (2 mM) and by 59% by Cu(2+) (2 mM).
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Affiliation(s)
- Jianmin Gao
- Department of Bioengineering, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, PR China
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Fan YT, Zhang YH, Zhang SF, Hou HW, Ren BZ. Efficient conversion of wheat straw wastes into biohydrogen gas by cow dung compost. BIORESOURCE TECHNOLOGY 2006; 97:500-5. [PMID: 15905089 DOI: 10.1016/j.biortech.2005.02.049] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2004] [Revised: 02/26/2005] [Accepted: 02/26/2005] [Indexed: 05/02/2023]
Abstract
Efficient conversion of wheat straw wastes into biohydrogen gas by cow dung compost was reported for the first time. Batch tests were carried out to analyze influences of several environmental factors on biohydrogen production from wheat straw wastes. The performance of biohydrogen production using the raw wheat straw and HCl pretreated wheat straw was then compared in batch fermentation tests. The maximum cumulative hydrogen yield of 68.1 ml H2/g TVS was observed at 126.5 h, the value is about 136-fold as compared with that of raw wheat straw wastes. The maximum hydrogen production rate of 10.14 ml H2/g TVS h was obtained by a modified Gompertz equation. The hydrogen content in the biogas was 52.0% and there was no significant methane observed in this study. In addition, biodegradation characteristics of the substrate were also discussed. The experimental results showed that the pretreatment of the substrate plays a key role in the conversion of the wheat straw wastes into biohydrogen by the composts generating hydrogen.
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Affiliation(s)
- Yao-Ting Fan
- Department of Chemistry, Zhengzhou University, Zhengzhou 450052, PR China.
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