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| Isaac,George Saad; Abu-Tahon,Medhat Ahmed. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Thermohalophilic fungus; Aspergillus terreus; Alkaline cellulase; Solid state fermentation; Corn stover. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000401269 |
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| Reis,Angélica Pataro; Guimarães,Valéria Monteze; Ferreira,Joana Gasperazzo; Queiroz,José Humberto de; Oliveira,Maria Goreti Almeida; Falkoski,Daniel Luciano; Almeida,Maíra Nicolau de; Rezende,Sebastião Tavares de. |
| Two α -galactosidase (P1 and P2) and one invertase present in the culture of Aspergillus terreus grown on wheat straw for 168 h at 28ºC were partially purified by gel filtration and hydrophobic interaction chromatographies. Optimum pH and temperatures for P1, P2 and invertase preparations were 4.5-5.0, 5.5 and 4.0 and 60, 55 and 65ºC, respectively. The K M app for Ï -nitrophenyl-α -D-galactopyranoside were 1.32 mM and 0.72 mM for P1 and P2, respectively, while the K M app value for invertase, using sacarose as a substrate was 15.66 mM. Enzyme preparations P1 and P2 maintained their activities after pre-incubation for 3 h at 50ºC and invertase maintained about 90% after 6 h at 55 ºC. P1 and P2 presented different inhibition sensitivities by Ag+,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aspergillus terreus; Galactooligosaccharides; Α-galactosidase; Invertase; Soy molasses. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000300029 |
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| Tanseer,Sundas; Anjum,Tehmina. |
| Most of the studies regarding cyclosporin 'A' production through fungi concentrate around Tolypocladium inflatum. This is mainly due to lower reported production of this drug in other fungi. The present study was therefore conducted to explore indigenous isolates of Aspergillus terreus for synthesis of this drug and defining a production medium for obtaining high yield of cyclosporin 'A'. For this purpose carbon and nitrogen sources were optimized for the selected best strain of A. terreus. Overall results depicted that the best cyclosporin 'A' yield from selected Aspergillus terreus (FCBP58) could be obtained by using production medium containing glucose 10% as carbon source and peptone 0.5% as nitrogen source. This modification in production medium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aspergillus terreus; Cyclosporin 'A'; Carbon; Nitrogen. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000400019 |
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| Ahmed,E.M.. |
| In attempt to immobilize the mycelial fungi on a new hydrophobic matrix, Aspergillus terreus mycelia were immobilized into polytetrafluoroethylen (PTFE) and used for selected conversion of progesterone to 11alpha-hydroxyprogesterone. The immobilized cells exhibited higher yields than the free cells. Different parameters that can affect the cell activity were measured. The optimum pH was 6 and the optimum temperature was 30ºC. Higher transformation activities were achieved with matrix contained 40% PTFE. No considerable loss in yield was observed with storage of the cells at 4ºC for 30 days. Utilization of the immobilized cells in repeated batch processes indicated that the cells retained about 84% of their activity after reuse for eight successive cycles. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: 11alpha-hydroxprogesterone; Polytetrafluoroethylene; Aspergillus terreus. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822007000200007 |
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| Shakibaie,Mojtaba; Ameri,Atefeh; Ghazanfarian,Roya; Adeli-Sardou,Mahboubeh; Amirpour-Rostami,Sahar; Torkzadeh-Mahani,Masoud; Imani,Mehdi; Forootanfar,Hamid. |
| ABSTRACT The ability of four Aspergillus strains for biosynthesis of kojic acid was evaluated among which Aspergillus terreus represented the highest level (2.21 g/L) of kojic acid production. Improvement kojic acid production ability of A. terreus by random mutagenesis using different exposure time to ultraviolet light (5–40 min) was then performed to obtain a suitable mutant of kojic acid production (designated as C5-10, 7.63 g/L). Thereafter, design of experiment protocol was employed to find medium components (glucose, yeast extract, KH2PO4 (NH4)2SO4, and pH) influences on kojic acid production by the C5-10 mutant. A 25-1 fractional factorial design augmented to central composite design showed that glucose, yeast extract, and KH2PO4 were the most... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Kojic acid; Aspergillus terreus; UV mutagenesis; Medium optimization. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000400865 |
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