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1

Characteristics and purification of Bacillus polymyxa B-20 amylases

100%
Rodziewicz A.
Biotechnologia
|
2000
|
issue 1
49-55
EN
Bacillus polymyxa B-20 alpha- and beta-amylase were purified using a combination of acetone fractionations, ion-exchange chromatography and amonium sulfate precipitation. The a-amylase was purified 18-fold, to a specific activity of 1065 U/ mg. The enzyme had on optimal temperature at 70oC and was stable up to 50oC in presence of Ca++. A purified enzyme displayed maxima for activity of pH 6,8 and was inhibited by 1 mM EDTA. Maltose is predominantly produced from starch. The beta-amylase had pH optima at 5,6 (acetate buffer), temperature optima at 60oC, was stable pH range of 5,0 to 7,5 at temperature up to 45oC. Enzyme activity was inhibited by sulfhydryl reagents such as pCMB and Hg++. Both B.polymyxa B-20, alpha- and beta-amylase are maltogenic enzymes.
2
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Application of Special Cause Control Charts to Green Sand Process

63%
Perzyk M., Rodziewicz A.
Archives of Foundry Engineering
|
2015
|
issue 4
3
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Application of Time-Series Analysis for Predicting Defects in Continuous Steel Casting Process

63%
Rodziewicz A., Perzyk M.
Archives of Foundry Engineering
|
2016
|
issue 4
4
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Application of Time-series Analysis in Control of Chemical Composition of Grey Cast Iron

63%
Perzyk M., Rodziewicz A.
|
|
issue 4
5

Keratins and their biodegradation

63%
Rodziewicz A., Laba W.
Biotechnologia
|
2006
|
issue 2
130-147
EN
The family of keratins comprises fibrous proteins of high mechanical and chemical stability, present in skin appendages like feathers, horn, hoof or hair, as well as cytokeratins forming a part of cytoskeleton of epithelial cells. The ability of keratin degradation is a feature of many saprophytic and pathogenic microorganisms, including bacteria, fungi and streptomyces. That also occurs during caspase-mediated apoptotic processes in vertebrate cells. The mechanism of microbial keratinolysis involves action of mainly alkaline serine proteases, but additional processes like sulphitolysis or mechanical breakdown are also known. Among a wide variety of microbes, bacteria, especially from the genus Bacillus, are of interest in terms of large scale biodegradation of keratinic wastes. Diverse applications, including poultry industry or farm wastes digestion, fertilizer composts production, broiler diets supplementation and prion protein decomposition, are mentioned.
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