scholarly journals Aspergillus niveus

2020 ◽  
Author(s):  
Keyword(s):  
Aspergillus Niveus

Kinetics of lead ion biosorption from aqueous solution onto lyophilized Aspergillus niveus

2010 ◽  
Vol 5 (1) ◽  
Author(s):  
Hülya Karaca ◽  
Turgay Tay ◽  
Merih Kıvanç
Keyword(s):  
Adsorption Capacity ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Second Order ◽  
Lead Ions ◽  
Lead Ion ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Aspergillus Niveus ◽  
Pseudo Second Order

The biosorption of lead ions (Pb2+) onto lyophilized fungus Aspergillus niveus was investigated in aqueous solutions in a batch system with respect to pH, contact time and initial concentration of the ions at 30 °C. The maximum adsorption capacity of lyophilized A. niveus was found to be 92.6 mg g−1 at pH 5.1 and the biosorption equilibrium was established about in 30 min. The adsorption capacity obtained is one of the highest value among those reported in the literature. The kinetic data were analyzed using the pseudo-first-order kinetic, pseudo-second-order kinetic, and intraparticle diffusion equations. Kinetic parameters, such as rate constants, equilibrium adsorption capacities, and related correlation coefficients for the kinetic models were calculated and discussed. It was found that the adsorption of lead ions onto lyophilized A. niveus biomass fit the pseudo-second-order kinetic model well. The Langmuir and Freundlich isotherm parameters for the lead ion adsorption were applied and the Langmuir model agreed better with the adsorption of lead ions onto lyophilized A. niveus.

scholarly journals Aspochalamins A-D and Aspochalasin Z Produced by the Endosymbiotic Fungus Aspergillus niveus LU 9575: I. Taxonomy, Fermentation, Isolation and Biological Activities

2004 ◽  
Vol 57 (11) ◽  
pp. 707-714 ◽  
Author(s):  
KLAUS GEBHARDT ◽  
JUDITH SCHIMANA ◽  
ALEXANDRA HÖLTZEL ◽  
KONRAD DETTNER ◽  
SIEGFRIED DRAEGER ◽  
...  
Keyword(s):  
Biological Activities ◽  
Aspergillus Niveus

scholarly journals Aspochalamins A-D and Aspochalasin Z Produced by the Endosymbiotic Fungus Aspergillus niveus LU 9575: II. Structure Elucidation

2004 ◽  
Vol 57 (11) ◽  
pp. 715-720 ◽  
Author(s):  
ALEXANDRA HÖLTZEL ◽  
DIETMAR G. SCHMID ◽  
GRAEME J. NICHOLSON ◽  
PHILIPP KRASTEL ◽  
AXEL ZEECK ◽  
...  
Keyword(s):  
Structure Elucidation ◽  
Aspergillus Niveus

Use of Cassava Peel as Carbon Source for Production of Amylolytic Enzymes by Aspergillus niveus

2009 ◽  
Vol 5 (5) ◽  
Author(s):  
Tony Marcio Silva ◽  
Ricardo Fernandes Alarcon ◽  
Andre Ricardo de Lima Damasio ◽  
Michele Michelin ◽  
Alexandre Maller ◽  
...  
Keyword(s):  
Carbon Source ◽  
Crude Extract ◽  
Soluble Starch ◽  
Culture Conditions ◽  
Amylolytic Enzymes ◽  
Agricultural Residue ◽  
Ph Values ◽  
Aspergillus Niveus ◽  
Static Conditions ◽  
Cassava Peel

Aspergillus niveus produced high levels of ?-amylase and glucoamylase in submerged fermentation using the agricultural residue cassava peel as a carbon source. In static conditions, the amylase production was substantially greater than in the agitated condition. The optimized culture conditions were initially at pH 5.0, 35°C during 48 hours. Amylolytic activity was still improved (50%) with a mixture of cassava peel and soluble starch in the proportion 1:1 (w/w). The crude extract exhibited temperature and pH optima approximately 70°C and 4.5, respectively. Amylase activity was stable for 1 h at 60°C, and at pH values between 3.0 and 7.0. The enzyme hydrolysed preferentially maltose, starch, penetrose, amylose, isomaltose, maltotriose, glycogen and amylopectin, and not hydrolysed cyclodextrin (? and ß), trehalose and sucrose. In the first hour of reaction on soluble starch, the hydrolysis products were glucose and maltose, but after two hours of hydrolysis, glucose was the unique product formed, confirming the presence in the crude extract of an ?-amylase and a glucoamylase.

Functional properties of a manganese-activated exo-polygalacturonase produced by a thermotolerant fungus Aspergillus niveus

2013 ◽  
Vol 58 (6) ◽  
pp. 615-621 ◽  
Author(s):  
Alexandre Maller ◽  
Tony Marcio da Silva ◽  
André Ricardo de Lima Damásio ◽  
Izaura Yoshico Hirata ◽  
João Atílio Jorge ◽  
...  
Keyword(s):  
Functional Properties ◽  
Aspergillus Niveus ◽  
Thermotolerant Fungus

Purification, partial characterization, and covalent immobilization–stabilization of an extracellular α-amylase from Aspergillus niveus

2013 ◽  
Vol 58 (6) ◽  
pp. 495-502 ◽  
Author(s):  
Tony Marcio Silva ◽  
André Ricardo de Lima Damásio ◽  
Alexandre Maller ◽  
Michele Michelin ◽  
Fabio M. Squina ◽  
...  
Keyword(s):  
Covalent Immobilization ◽  
Partial Characterization ◽  
Aspergillus Niveus

scholarly journals Production and characterization of a thermostable antifungal chitinase secreted by the filamentous fungus Aspergillus niveus under submerged fermentation

3 Biotech ◽  
2018 ◽  
Vol 8 (8) ◽  
Author(s):  
Thaís Barboni Alves ◽  
Pedro Henrique de Oliveira Ornela ◽  
Arthur Henrique Cavalcanti de Oliveira ◽  
João Atílio Jorge ◽  
Luis Henrique Souza Guimarães
Keyword(s):  
Filamentous Fungus ◽  
Submerged Fermentation ◽  
Aspergillus Niveus ◽  
Antifungal Chitinase
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