مقالههای Giti Emtiazi
توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقالههای نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده میشوند.
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال ۱۳۸۶
تعداد صفحات: ۱۱
Successful bioremediation of contaminated soils is often limited by physico–chemical and biological factors. The aim of this work is devoted to investigating the effect of 8 important factors on bioremediation of crude oil contaminated soil. These factors are time, salt, activated sludge, bacteria, compost, molasses, humidity and urea. We used a mixed culture with three sp. of isolated bacteria. Design of experiment was done according to Taguchi method. The effective percent was determined for each factor by the analysis of variance. The results showed bacteria is the most important factor where salt and compost have the lowest effective percent. The optimum values of factors were obtained and the maximum oil removal percent in optimum conditions was 68%, where the intrinsic bioremediation was about 12%.<\div>
اطلاعات انتشار: applied food biotechnology، سوم،شماره۱، winter ۲۰۱۶، سال ۰
تعداد صفحات: ۷
The effect of different carbon sources on bacterial cellulose production by Gluconacetobacter xylinus (PTCC 1734) and two newly isolated strains (from vinegar) under static culture conditions was studied. The production of bacterial cellulose was examined in modified Hestrin–Shramm medium by replacing D–glucose with other carbon sources. The results showed that the yield and characteristics of bacterial cellulose were influenced by the type of carbon source. Glycerol gave the highest yield in all of the studied strains (6%, 9.7% and 3.8% for S, A2 strain and Gluconacetobacter xylinus (PTCC 1734), respectively). The maximum dry bacterial cellulose weight in the glycerol containing medium is due to A2 strain (1.9 g l–1 ) in comparison to Gluconacetobacter xylinus as reference strain (0.76 g l–1 ). Although all of the studied strains were in Gluconacetobacter family, each used different sugars for maximum production after glycerol (mannitol and fructose for two newly isolated strains and glucose for Gluconacetobacter xylinus). The maximum moisture content was observed when sucrose and food–grade sucrose were used as carbon source. Contrary to expectations, while the maximum thickness of bacterial cellulose membrane was attained when glycerol was used, bacterial cellulose from glycerol had less moisture content than the others. The oxidized cellulose showed antibacterial activities, which makes it as a good candidate for food–preservatives.
۳Isolation and Identification of Alicyclobacillus with High Dipicolinic Acid and Heat Resistant Proteins from Mango Juice
اطلاعات انتشار: applied food biotechnology، سوم،شماره۴، Autumn ۲۰۱۶، سال ۰
تعداد صفحات: ۵
Background and Objectives: Microbial spoilage of juices and industries related with Alicyclobacillus are considerable international issues. This spore–forming bacterium causes changes in juices odor and taste. The isolation and identification of Alicyclobacillus contamination in juice producing and packaging industries has an essential role in the prevention and control of this type of spoilage bacterium in HACCP (Hazard analysis and critical control points ) manner.Materials and Methods: A thermo–acidophilic, non–pathogenic and sporeforming bacterium was isolated from mango juice. Preliminary identification of the isolates was based on morphological, biochemical and physiological properties. Identification at species level was made by PCR amplification. The influence of temperature in the range of 25–65°C in the growth of bacterium and in the range of 80–120°C in spore–resistant and heat resistant proteins was investigated and compared with other spore producing bacteria.Results and Conclusion: Phylogenetic analysis of the 16S rRNA gene sequencing indicated that the isolated strain constituted a distinct lineage in the Alicyclobacillus cluster and submitted to NCBI with access number Alicyclobacillus HRM–5 KM983424.1. The spores resisted 110°C for 3 h, and produced 28% dipicolinic acid more comparable to Bacillus licheniformis. Also they could produce 0.69 mg heat resistance protein after 1.5 h treatment in 100°C. The results showed that this strain could have biotechnological applications.
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