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Publication Date
Thu Feb 10 2022
Journal Name
Iraqi Journal Of Science
Volume
57
Issue Number
3C
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ijs-6436
Determination of optimum conditions for xylanase production by Aspergillus niger using solid state fermentation
Aspergillus niger
Xylanase
Solid state fermentation
Optimization
Mohammed A.
Ali J. R.
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Aspergillus niger is one of the most important filamentous fungi that used in the fermentation industry. Aspergillus niger isolate was cultured on potato-dextrose agar (PDA) for activation, and the optimum conditions for xylanase production from this local isolate were studied by solid state fermentation, using a medium composed of wheat bran moisten with corn steep liquor at ratio 1:0.5 (v:w) at initial pH 5.5, inoc-ulated with 1.6 × 106 spores/ml, and incubated at 30ᵒC for 5 days.

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Publication Date
Mon Nov 01 2010
Journal Name
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Chemical Elements Diffusion in the Solar Interior
The standard solar model and equation of state have been used to study relative diffusion of Hydrogen and Helium in the present time for solar interior
as a function of distance and depth from the center of the star. The effects of temperature and density on diffusion velocity for these chemical elements have been explaned. It is found that heat flow which is arising from these reactions leads to an increase in helium diffusion velocity
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Helium and other Heavy Elements could be determined for the main sequence stars and white dwarf stars.
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