scholarly journals The influence of Bacillus subtilis on tin-coated copper in an aqueous environment

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4671-4679
Author(s):  
Ruilin Xiong ◽  
Kui Xiao ◽  
Pan Yi ◽  
Yuting Hu ◽  
Chaofang Dong ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Culture Medium ◽  
Corrosion Behaviour ◽  
Aqueous Environment

The effect of Bacillus subtilis (BS) on the corrosion behaviour of tin-coated copper was investigated by exposing the sample to a culture medium inoculated with BS.

Corrosion Process of Incoloy-800 in High Pressure and Temperature Aqueous Environment

2008 ◽  
Vol 59 (9) ◽  
Author(s):  
Dumitra Lucan ◽  
Manuela Fulger ◽  
Gheorghita Jinescu
Keyword(s):  
Corrosion Behaviour ◽  
Gravimetric Method ◽  
Corrosion Process ◽  
Aqueous Environment ◽  
Accelerated Tests ◽  
Steam Generators ◽  
High Pressure And Temperature ◽  
Eds Analysis ◽  
Incoloy 800 ◽  
Steam Generator Tubes

The Steam Generators (SG), equipment that ensures the connection between the primary and secondary circuits, creates several safety problems during operation, mainly due to corrosion and mechanical damages. To provide information about the corrosion behaviour of the structural materials from CANDU SG under normal and abnormal conditions of operation and to identify the failure types produced by the corrosion were performed corrosion experiments consisting in chemical accelerated tests, static autoclaving and electrochemical methods. The gravimetric method, optical metallographic microscopy, XRD and EDS analysis, as well as electrochemical measurements have been used to evaluate the corrosion behavior of the steam generator tubes material (Incoloy-800).

scholarly journals Enhancement of protease production by the optimization of Bacillus subtilis culture medium

2013 ◽  
Author(s):  
Cheong, J.Y. ◽  
Mustafa, M. ◽  
Abd. Aziz, N.A. ◽  
Go, R. ◽  
Ahmad Adli, A.
Keyword(s):  
Bacillus Subtilis ◽  
Culture Medium ◽  
Protease Production

scholarly journals Matrix-Enhanced Calibration Procedure for Multivariate Calibration Models with Near-Infrared Spectra

1998 ◽  
Vol 52 (10) ◽  
pp. 1339-1347 ◽  
Author(s):  
Mark R. Riley ◽  
Mark A. Arnold ◽  
David W. Murhammer
Keyword(s):  
Culture Medium ◽  
Complex Mixture ◽  
Calibration Procedure ◽  
Aqueous Environment ◽  
Prediction Errors ◽  
Calibration Data ◽  
Data Set ◽  
Calibration Models ◽  
Two Samples ◽  
Concentration Changes

A novel method is introduced for developing calibration models for the spectroscopic measurement of chemical concentrations in an aqueous environment. To demonstrate this matrix-enhanced calibration procedure, we developed calibration models to quantitate glucose and glutamine concentrations in an insect cell culture medium that is a complex mixture of more than 20 components, with three components that manifest significant concentration changes. Accurate calibration models were generated for glucose and glutamine by using a calibration data set composed of 60 samples containing the analytes dissolved in an aqueous buffer along with as few as two samples of the analytes dissolved in culture medium. Standard errors of prediction were 1.0 mM for glucose and 0.35 mM for glutamine. The matrix-enhanced method was also applied to culture medium samples collected during the course of a second bioreactor run. Addition of three culture medium samples to a buffer calibration reduced glucose prediction errors from 3.8 mM to 1.0 mM; addition of two culture medium samples reduced glutamine prediction errors from 1.6 mM to 0.76 mM. Results from this study suggest that spectroscopic calibration models can be developed from a relatively simple set of samples provided that some account for variations in the sample matrix.

scholarly journals Production of Enzymes from Agroindustrial Wastes by Biosurfactant-Producing Strains of Bacillus subtilis

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Francisco Fábio Cavalcante Barros ◽  
Ana Paula Resende Simiqueli ◽  
Cristiano José de Andrade ◽  
Gláucia Maria Pastore
Keyword(s):  
Bacillus Subtilis ◽  
Culture Medium ◽  
Synthetic Medium ◽  
Lipase Production ◽  
Industrial Processes ◽  
Technical Literature ◽  
Wide Range ◽  
Cassava Wastewater ◽  
Agroindustrial Wastes ◽  
Better Than

Bacteria in the genus Bacillus are the source of several enzymes of current industrial interest. Hydrolases, such as amylases, proteases, and lipases, are the main enzymes consumed worldwide and have applications in a wide range of products and industrial processes. Fermentation processes by Bacillus subtilis using cassava wastewater as a substrate are reported in the technical literature; however, the same combination of microorganisms and this culture medium is limited or nonexistent. In this paper, the amylase, protease, and lipase production of ten Bacillus subtilis strains previously identified as biosurfactant producers in cassava wastewater was evaluated. The LB1a and LB5a strains were selected for analysis using a synthetic medium and cassava wastewater and were identified as good enzyme producers, especially of amylases and proteases. In addition, the enzymatic activity results indicate that cassava wastewater was better than the synthetic medium for the induction of these enzymes.

scholarly journals Evaluation of agro-industrial residues produced in Costa Rica for a low-cost culture medium using Bacillus subtilis 168

2020 ◽  
Author(s):  
Sofía Miranda-Durán ◽  
Luis Porras-Reyes ◽  
Alexander Schmidt-Durán
Keyword(s):  
Bacillus Subtilis ◽  
Costa Rica ◽  
Culture Medium ◽  
Low Cost ◽  
Organic Residues ◽  
Nitrogen And Phosphorus ◽  
Industrial Residues ◽  
Economic Problems ◽  
Bacillus Subtilis 168 ◽  
Phosphorus Sources

Agro-industrial residues correspond to all the materials generated from activities that involve the transformation of both crops and livestock to obtain processed or semi-finished products. In Costa Rica, the primary sector of economy generates more than 6.3 trillion tons of organic residues per year. The daily generation of this residues pose environmental and economic problems. In recent years, biotechnological-based alternatives have emerged with the purpose of taking advantage of the high nutritional content of these residues to cultivate microorganisms capable of producing compounds with high demand at a commercial level. The present study evaluates six agro-industrial residues produced in Costa Rica, in order to growth Bacillus subtilis 168.  An optimization of the culture medium was carried out under a complete factorial design 23, where the variables evaluated were carbon, nitrogen and phosphorus sources. Molasses at 10% m/v, wheat bran at 0.5% m/v, and K2HPO4 at 0.01%, as a carbon, nitrogen, and phosphorus sources, respectively, were identified as optimal for the growth of Bacillus subtilis 168.

scholarly journals Effect of culture medium on biocalcification by Pseudomonas Putida, Lysinibacillus Sphaericus and Bacillus Subtilis

2011 ◽  
Vol 42 (2) ◽  
pp. 499-507 ◽  
Author(s):  
Márcia Aiko Shirakawa ◽  
Maria Alba Cincotto ◽  
Daniel Atencio ◽  
Christine C. Gaylarde ◽  
Vanderley M. John
Keyword(s):  
Bacillus Subtilis ◽  
Pseudomonas Putida ◽  
Culture Medium ◽  
Lysinibacillus Sphaericus

On the appearance of Bacillus subtilis intracellular serine protease in the cell membrane and culture medium

1978 ◽  
Vol 119 (3) ◽  
pp. 287-293 ◽  
Author(s):  
Alexander Ya. Strongin ◽  
Lara S. Izotova ◽  
Zakhar T. Abramov ◽  
Lidia M. Ermakova ◽  
Dmitrii I. Gorodetsky ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Cell Membrane ◽  
Serine Protease ◽  
Culture Medium
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