نتایج جستجو برای: parastromateus niger

تعداد نتایج: 10948  

Journal: :Insects 2012
Tom H Oliver Simon R Leather James M Cook

Ants often form mutualistic interactions with aphids, soliciting honeydew in return for protective services. Under certain circumstances, however, ants will prey upon aphids. In addition, in the presence of ants aphids may increase the quantity or quality of honeydew produced, which is costly. Through these mechanisms, ant attendance can reduce aphid colony growth rates. However, it is unknown ...

Journal: :Microbiology 1999
G J Ruijter P J van de Vondervoort J Visser

The external pH appeared to be the main factor governing oxalic acid production by Aspergillus niger. A glucose-oxidase-negative mutant produced substantial amounts of oxalic acid as long as the pH of the culture was 3 or higher. When pH was decreased below 2, no oxalic acid was formed. The activity of oxaloacetate acetylhydrolase (OAH), the enzyme believed to be responsible for oxalate formati...

Journal: :American journal of clinical pathology 2012
Thomas A Selvaggi Jeremy P Walco Sujal Parikh Gary A Walco

We sought to determine if sufficient redundancy exists between specific IgE testing for Aspergillus fumigatus and Aspergillus niger to eliminate one of the assays in determining Aspergillus hypersensitivity. We reviewed regional laboratory results comparing A fumigatus-specific IgE with A niger-specific IgE using the Pharmacia UniCAP system (Pharmacia, Kalamazoo, MI). By using the Fisher exact ...

2017
Dorett I. Odoni Merlijn P. van Gaal Tom Schonewille Juan A. Tamayo-Ramos Vitor A. P. Martins dos Santos Maria Suarez-Diez Peter J. Schaap

Aspergillus niger has an innate ability to secrete various organic acids, including citrate. The conditions required for A. niger citrate overproduction are well described, but the physiological reasons underlying extracellular citrate accumulation are not yet fully understood. One of the less understood culture conditions is the requirement of growth-limiting iron concentrations. While this ha...

2015
Shu-Yang Wang Bo-Ling Jiang Xiang Zhou Ji-Hong Chen Wen-Jian Li Jing Liu Wei Hu Guo-Qing Xiao Miao-Yin Dong Yu-Chen Wang Shihui Yang

The aim of this study was to evaluate and validate the efficiency of 12C6+ irradiation of Aspergillus niger (A. niger) or mutagenesis via mixed Trichoderma viride (T. viride) culturing as well as a liquid cultivation method for cellulase production via mixed Trichoderma reesei (T. reesei) and A. niger culture fermentation. The first mutagenesis approach was employed to optimize yield from a cel...

Journal: :Letters in applied microbiology 2005
X Ni D A Streett

AIMS To examine whether water activity (aw) in combination with low concentration of fungicides can be used to effectively control Aspergillus niger van Tieghem growth in cultural medium, the Sabouraud dextrose agar (SDA). The data would be used as baseline information for reducing A. niger contamination in insect artificial diets. METHODS AND RESULTS Aspergillus niger was isolated from an in...

2012
Ajay K Gautam Shubhi Avasthi Anu Sharma

The present study explores the association of Aspergillus niger with stored raw and powdered ingredients of Triphala Churn, which is a 1:1:1 proportional combination of Emblica officinalis Gaertn. (Amla), Terminalia bellerica (Gaertn.) Roxb. (Baheda), and Terminalia chebula Retz. (Harada) respectively. Total 106 stored fruits and 68 powdered samples of E. officinalis, T. bellerica and T. chebul...

2016
N. Mahalakshmi S. Jayalakshmi

The aim of the present work was focused on the cellulase production by Aspergillus niger using different substrates (i.e) rice bran, wheat bran, black gram bran, coconut oil cake, groundnut oil cake, and gingely oil cake. Solid state fermentation holds tremendous potentials for the production of the enzyme cellulase by Aspergillus niger. These agro industrial residues are cheap raw materials fo...

Journal: :Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2007
Natalia Nugaeva Karin Y Gfeller Natalia Backmann Marcel Düggelin Hans Peter Lang Hans-Joachim Güntherodt Martin Hegner

We demonstrate a new sensitive biosensor for detection of vital fungal spores of Aspergillus niger. The biosensor is based on silicon microfabricated cantilever arrays operated in dynamic mode. The change in resonance frequency of the sensor is a function of mass binding to the cantilever surface. For specific A. niger spore immobilization on the cantilever, each cantilever was individually coa...

Journal: :Applied and environmental microbiology 1997
R P de Vries B Michelsen C H Poulsen P A Kroon R H van den Heuvel C B Faulds G Williamson J P van den Hombergh J Visser

We report the cloning and characterization of a gene encoding a ferulic acid esterase, faeA, from Aspergillus niger and Aspergillus tubingensis. The A. niger and A. tubingensis genes have a high degree of sequence identity and contain one conserved intron. The gene product, FAEA, was overexpressed in wild-type A. tubingensis and a protease-deficient A. niger mutant. Overexpression of both genes...

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