Many bacteria are involved in fermentation of doenjang and Bacillus species are known to perform significant roles. Although the SDS-PAGE technique has been frequently used for classification and identification of bacteria in various samples, there has been no investigation of the microbial diversity in doenjang. This study aims to investigate the identification and distribution of dominant Bacillus species in doenjang using SDS-PAGE profiles of whole cell proteins and 16S rDNA sequencing. SDS-PAGE of whole cell proteins of the reference Bacillus strains yielded differential banding patterns that could be considered to be highly specific fingerprints. Bacterial strains isolated from doenjang samples were grouped using whole cell protein patterns, which were confirmed by the analysis of 16S rDNA sequencing. B. subtilis was found to be the most dominant strain in most of the samples, and B. licheniformis and B. amyloliquefaciens were less frequently detected. The results obtained in this study showed that a combined identification method, SDS-PAGE patterns of whole cell proteins and subsequent 16S rDNA sequence analysis, could successfully identify Bacillus species isolated from doenjang.
"These methods are time-consuming and do not provide an insight into the physiological properties of the microorganism.    Koichi Tanaka, the winner of the Nobel Prize in Chemistry in 2002, developed a method using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry "
[Show abstract][Hide abstract] ABSTRACT: RATIONALE Due to increases in greenhouse gas emissions, it is necessary to explore renewable sources of energy. Interesting alternatives are biofuels derived from microalgae. One challenge is the development of a detailed microalgae database compiling species identifications and characterizations that would facilitate microalgae selection for biomass production. Mass spectrometric (MS) analysis using a matrix-assisted laser desorption/ionization (MALDI) source is an advanced technique that enables advancement in this biological area. In this work a MALDI time-of-flight (TOF)MS method for the rapid identification of proteins in whole cells of selected microalgae species was studied. Furthermore, the efficiency of different matrix and solvent systems was tested. MS analyses were performed using an UltrafleXtreme MALDI-TOF mass spectrometer operating in linear positive ion mode.
Rapid Communications in Mass Spectrometry 02/2015; 29(3). DOI:10.1002/rcm.7110 · 2.25 Impact Factor
"The presence of cfr was screened by PCR with previously described primers
. Species identification of the cfr-carrying strains was performed by the API-Staph System (bioMérieux, France) and further confirmed by 16S rRNA sequencing
[Show abstract][Hide abstract] ABSTRACT: Background
The emergence and wide distribution of the transferable gene for linezolid resistance, cfr, in staphylococci of human and animal origins is of great concern as it poses a serious threat to the public health. In the present study, we investigated the emergence and presence of the multiresistance gene, cfr, in retail meat sourced from supermarkets and free markets of Guangzhou, China.
A total of 118 pork and chicken samples, collected from Guangzhou markets, were screened by PCR for cfr. Twenty-two Staphylococcus isolates obtained from 12 pork and 10 chicken samples harbored cfr. The 22 cfr-positive staphylococci isolates, including Staphylococcus equorum (n = 8), Staphylococcus simulans (n = 7), Staphylococcus cohnii (n = 4), and Staphylococcus sciuri (n = 3), exhibited 17 major SmaI pulsed-field gel electrophoresis (PFGE) patterns. In 14 isolates, cfr was located on the plasmids. Sequence analysis revealed that the genetic structures (including ΔtnpA of Tn558, IS21-558, ΔtnpB, and tnpC of Tn558, orf138, fexA) of cfr in plasmid pHNTLD18 of a S. sciuri strain and in the plasmid pHNLKJC2 (including rep, Δpre/mob, cfr, pre/mob and partial ermC) of a S. equorum strain were identical or similar to the corresponding regions of some plasmids in staphylococcal species of animal and human origins.
To the best of our knowledge, this is the first study to report the presence of the multiresistance gene, cfr, in animal meat. A high occurrence of cfr was observed in the tested retail meat samples. Thus, it is important to monitor the presence of cfr in animal foods in China.
"Cellular protein samples were prepared according to Kim et al. (2010). Flasks (250 ml) each containing 50 ml LB broth were inoculated with the bacterial species and incubated overnight at 20, 25, 30, 35, 40, 45 and 50 @BULLETC by shaking until OD 600 ~0.4, "
[Show abstract][Hide abstract] ABSTRACT: Three gram positive bacterial isolates, isolated from soil and identified as Bacillus licheniformis, Bacillus circulans and Geobacillus thermoglucosidasius were grown at 20, 35, and 50 o C then subjected to cellular fatty acids analysis. Although in different amounts, the fatty acids (10:0), (12:0), (14:0), (16:0) and (17:0) were detected in cells of the three bacterial isolates obtained from all the incubation temperatures. Increasing temperature from 20 to 50 o C raised the proportion of the saturated fatty acids by 26.10%, 09.89% and 29.61% in B. licheniformis, B. circulans and G. thermoglucosidasius, respectively. Cellular protein contents and protein banding pattern on SDS-PAGE of the three isolates were estimated at 20, 25, 30, 35, 40, 45 and 50 o C. The highest amount of protein concentration in all isolates was obtained at 20ºC. In contrast, the highest number of protein bands was not obtained from these treatments.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.