کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5740275 1616294 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of feather-degrading bacterial populations from birds' nests - Potential strains for biomass production for animal feed
ترجمه فارسی عنوان
تشخیص جمعیت باکتری های پر از پرنده از لانه پرندگان - کشش های بالقوه برای تولید زیست توده برای خوراک حیوانات
کلمات کلیدی
باکتری کراتینولیتیک، پر، باسیلوس، خوراک، لیزین، زیست توده،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
چکیده انگلیسی


- Non-pathogenic Bacillus strains able to utilize feathers in the absence of additional nutrients were isolated.
- These strains would be safe and convenient to use as biomass for animal feeds.
- Feather hydrolysate has an improved amino acid composition regarding some limiting amino acids compared to feathers.
- Amino acid content of the product can be tailored by varying the fermentation time.

Feather degrading bacteria from birds' nests were characterized to find safe bacterial strains that could be utilized to convert feathers into soluble form and bacterial biomass for feed purposes. Of all tested 571 isolates 122 were keratinolytic. Partial sequencing of the 16S rRNA gene revealed that the keratinolytic isolates represented Proteobacteria (genera Pseudomonas and Stenotrophomonas) and Firmicutes (genera Bacillus, Exiguobacterium, Paenibacillus, Rummeliibacillus, and Sporosarcina). Bacillus cereus group and gram-negative bacterial isolates were not further characterized due to safety concerns related to potential pathogenicity or potential exposure of animals or workers to endotoxins (lipopolysaccharide part of the gram-negative cell wall). Keratinolytic strains showed clear differences in their ability to solubilize feathers with feather weight losses up to 30%. Amino acid composition of feather hydrolysates shifted from feather composition towards more bacterial-like composition. Especially the levels of lysine could be increased in the feather hydrolysate with bacterial fermentation. Feathers can be effectively hydrolyzed with non-pathogenic bacteria without any additional nutrients. The resulting feather hydrolysate is easier to digest than feather material and it has an improved amino acid composition regarding some limiting amino acids. The amino acid content of the final product can be tailored by varying the fermentation time and thus the ratio of bacterial cells to the feather hydrolysate.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Biodeterioration & Biodegradation - Volume 123, September 2017, Pages 262-268
نویسندگان
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