Journal of Microbiology

Journal Articles

Ultrasonic Treatment Enhanced Astaxanthin Production of Haematococcus pluvialis: Yun Hwan Park , Jaewon Park , Jeong Sik Choi , Hyun Soo Kim , Jong Soon Choi , Yoon-E Choi; J. Microbiol. 2023;61(6):633-639. Published online June 13, 2023; DOI: https://doi.org/10.1007/s12275-023-00053-5

61 View
0 Download
4 Web of Science
2 Crossref

In this study, effects of ultrasonic treatment on Haematococcus pluvialis (H. pluvialis) were investigated. It has been confirmed that the ultrasonic stimulation acted as stress resources in the red cyst stage H. pluvialis cells containing astaxanthin,
result
ing in additional astaxanthin production. With the increase in production of astaxanthin, the average diameter of H. pluvialis cells increased accordingly. In addition, to determine how ultrasonic stimulation had an effect on the further biosynthesis of astaxanthin, genes related to astaxanthin synthesis and cellular ROS level were measured. As a result, it was confirmed that astaxanthin biosynthesis related genes and cellular ROS levels were increased, and thus ultrasonic stimulation acts as an oxidative stimulus. These results support the notion on the effect of the ultrasonic treatment, and we believe our novel approach based on the ultrasonic treatment would help to enhance the astaxanthin production from H. pluvialis.

Citations

Citations to this article as recorded by

Recent Advances in Astaxanthin as an Antioxidant in Food Applications
Yimeng Dang, Zhixi Li, Fanqianhui Yu
Antioxidants.2024; 13(7): 879. CrossRef
Effect of reduced atmospheric pressures on the morphology and astaxanthin biosynthesis of microalga Haematococcus lacustris
Sangui Kim, Rendi Mahadi, Aditya Lakshmi Narasimhan, Catherine Christabel, Hyoji Yu, Eui-Jin Kim, You-Kwan Oh
Biotechnology and Bioprocess Engineering.2024; 29(6): 1131. CrossRef

Imipenem-resistant Gram-negative bacterial isolates carried by persons upon medical examination in Korea: So Yeon Kim , Sang Yop Shin , Ji-Young Rhee , Kwan Soo Ko; J. Microbiol. 2017;55(8):612-618. Published online July 18, 2017; DOI: https://doi.org/10.1007/s12275-017-6555-8

57 View
0 Download
3 Crossref

Abstract

Carbapenem-resistant Gram-negative bacteria (CR-GNB) have emerged and disseminated worldwide, become a great concern worldwide including Korea. The prevalence of fecal carriage of imipenem-resistant Gram-negative bacteria (IRGNB) in persons in Korea was investigated. Stool samples were collected from 300 persons upon medical examination. Samples were screened for IR-GNB by using MacConkey agar with 2 μl/ml imipenem. Species were identified by 16S rRNA gene sequence analysis, and antimicrobial susceptibility was determined by the broth microdilution method. In total, 82 IR-GNB bacterial isolates were obtained from 79 (26.3%) out of 300 healthy persons. Multilocus sequence typing analysis showed very high diversity among IR P. aeruginosa, S. maltophilia, and E. cloacae isolates, and pulsedfield gel electrophoresis revealed five main pulsotypes of IR P. mirabilis. As for the presence of metallo-β-lactamases (MBLs), only one IMP-25-producing S. marcescens isolate was identified. Although only one carbapenemase-producing isolate was identified, the high colonization rates with IRGNB isolates in this study is notable because carriers may be a reservoir for the dissemination of resistant pathogens within the community as well as in health care institutions.

Citations

Citations to this article as recorded by

Global mapping of antibiotic resistance rates among clinical isolates of Stenotrophomonas maltophilia: a systematic review and meta-analysis
Narjess Bostanghadiri, Mohammad Sholeh, Tahereh Navidifar, Leila Dadgar-Zankbar, Zahra Elahi, Alex van Belkum, Davood Darban-Sarokhalil
Annals of Clinical Microbiology and Antimicrobials.2024;[Epub] CrossRef
Advances in the Microbiology of Stenotrophomonas maltophilia
Joanna S. Brooke
Clinical Microbiology Reviews.2021;[Epub] CrossRef
Clonal spreading of NDM-5 carbapenemase-producing Escherichia coli isolates in a hospital in South Korea
So Yeon Kim, Jungyu Seo, Juyoun Shin, Yeun-Jun Chung, In Young Jeon, Seon Jin Yun, Yeon-Sook Kim, Kwan Soo Ko
Diagnostic Microbiology and Infectious Disease.2020; 97(2): 115027. CrossRef

Research Support, Non-U.S. Gov't

Functional properties of the major outer membrane protein in Stenotrophomonas maltophilia: Yih-Yuan Chen , Han-Chiang Wu , Juey-Wen Lin , Shu-Fen Weng; J. Microbiol. 2015;53(8):535-543. Published online July 31, 2015; DOI: https://doi.org/10.1007/s12275-015-5202-5

47 View
0 Download
5 Crossref

Abstract

Stenotrophomonas maltophilia is an opportunistic pathogen that is closely associated with high morbidity and mortality in debilitated and immunocompromised individuals. Therefore, to investigate the pathogenesis mechanism is urgently required. However, there are very few studies to evaluate the functional properties of outer membrane protein, which may contribute to the pathogenesis in S. maltophilia. In this study, three abundant proteins in the outer membrane fraction of S. maltophilia were identified by liquid chromatography- tandem mass spectrometry as OmpW1, MopB, and a hypothetical protein. MopB, a member of the OmpA family, was firstly chosen for functional investigation in this study because many OmpA-family proteins are known to be involved in pathogenesis and offer potential as vaccines. Membrane fractionation analyses demonstrated that MopB was indeed the most abundant outer membrane protein (OMP) in S. maltophilia. For functional studies, the mopB mutant of S. maltophilia (SmMopB) was constructed by insertional mutation. MopB deficiency resulted in a change in the protein composition of OMPs and altered the architecture of the outer membrane. The SmMopB strain exhibited reduced cytotoxicity toward L929 fibroblasts and was more sensitive to numerous stresses, including human serum, sodium dodecyl sulfate, and hydrogen peroxide compared with wildtype S. maltophilia. These results suggest that MopB may be a good candidate for the design of vaccines or anti-MopB drugs for controlling serious nosocomial infections of multidrug- resistant S. maltophilia, especially in immunosuppressed patients.

Citations

Citations to this article as recorded by

σ P -NagA-L1/L2 Regulatory Circuit Involved in ΔompA 299-356 -Mediated Increase in β-Lactam Susceptibility in Stenotrophomonas maltophilia
Li-Hua Li, Cheng-Mu Wu, Chia-Lun Chang, Hsin-Hui Huang, Chao-Jung Wu, Tsuey-Ching Yang, Silvia T. Cardona
Microbiology Spectrum.2022;[Epub] CrossRef
Advances in the Microbiology of Stenotrophomonas maltophilia
Joanna S. Brooke
Clinical Microbiology Reviews.2021;[Epub] CrossRef
Recombinant Ax21 protein is a promising subunit vaccine candidate against Stenotrophomonas maltophilia in a murine infection model
Amal Tarek Sarhan, Mohammed Bahey-El-Din, Taha Ibrahim Zaghloul
Vaccine.2021; 39(32): 4471. CrossRef
Intranasal immunization with recombinant outer membrane protein A induces protective immune response against Stenotrophomonas maltophilia infection
Yan Li, Xueping Tang, Zunquan Zhao, Hui Wang, Xin Wang, Xueyi Shang, Peng Liu, Zhihua Kou, Yongqiang Jiang, Yan Li, Daniela Flavia Hozbor
PLOS ONE.2019; 14(4): e0214596. CrossRef
The Major Outer Membrane Protein MopB Is Required for Twitching Movement and Affects Biofilm Formation and Virulence in Two Xylella fastidiosa strains
Hongyu Chen, Prem P. Kandel, Luisa F. Cruz, Paul A. Cobine, Leonardo De La Fuente
Molecular Plant-Microbe Interactions®.2017; 30(11): 896. CrossRef

First
Prev
Page of 1
Next
Last

Search