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Current Microbiology

Claudia Pala, Massimiliano Molari, Daniele Nizzoli, Marco Bartoli, Pierluigi Viaroli, Elena Manini
The environmental factors controlling the abundance of Bacteria and Archaea in lagoon ecosystems are poorly understood. Here, an integrated physico-chemical, biogeochemical, and microbiological survey was applied in the Sacca di Goro lagoon (Po River Delta, Italy) to investigate the variation of bacterial and archaeal abundance, as assessed by Fluorescence In Situ Hybridization, along winter and summer environmental gradients. We hypothesised that bacterial and archaeal cells respond differentially to physico-chemical parameters of the sediment, which can be manifested in variations of total cells number...
May 15, 2018: Current Microbiology
Sooyeon Park, Sung-Min Won, Jung-Hoon Yoon
A Gram-stain-negative, aerobic, non-motile, and carrageenan-degrading bacterial strain, designated OISW-17T , was isolated from seawater around Oido, an island of South Korea, and its taxonomic position was determined using a polyphasic study. Optimal growth of the novel strain occurred at 20-25 °C and in the presence of 2.0% (w/v) NaCl. Phylogenetic trees using 16S rRNA gene sequences showed that strain OISW-17T forms a cluster with the type strains of Dokdonia species. The novel strain exhibited 16S rRNA gene sequence similarities of 95...
May 14, 2018: Current Microbiology
Jing Zhou, Jiwei Duan, Mingkun Gao, Ying Wang, Xiaohua Wang, Kai Zhao
Termites are global pests and can cause serious damage to buildings, crops, and plantation forests. The symbiotic intestinal flora plays an important role in the digestion of cellulose and nitrogen in the life of termites. Termites and their symbiotic microbes in the gut form a synergistic system. These organism work together to digest lignocellulose to make the termites grow on nitrogen deficient food. In this paper, the diversity of symbiotic microorganisms in the gut of termites, including protozoan, spirochetes, actinomycetes, fungus and bacteria, and their role in the digestion of lignocellulose and also the biotechnological applications of these symbiotic microorganisms are discussed...
May 12, 2018: Current Microbiology
Xiaofen Zhang, Yuhua Ma, Guisheng Ye
Bacterial biofilms can enhance survival in adverse environments and promote infection. However, little is known about biofilm formation by Clostridium perfringens. To better characterize this process, we used SEM to observe the surfaces of C. perfringens biofilms after 12, 24, 48, and 72 h of incubation. Biofilm cells appeared to be encased in a dense matrix material, and the total biomass of the biofilm increased with incubation time. To gain insight into the differentially expressed genes (DEGs) between biofilm and planktonic cells, we carried out comparative transcriptomic analysis using RNA sequencing...
May 11, 2018: Current Microbiology
Sebastian J Midhun, Sahadevan Neethu, A Vysakh, E K Radhakrishnan, Mathew Jyothis
Bacterial fish pathogens are pervasive in aquaculture. Control of bacterial fish pathogen is a difficult task among aquaculture practitioners. A large number of antibiotics are used for the control of prevalent bacterial pathogens in aquaculture. This may lead to drug resistance among pathogens and further treatment will be ineffective. Here, we can use probiotic bacteria as a biocontrol agent in fish disease and it is a novel field. In this study, antimicrobial potential of the bacterium Bacillus coagulans (MTCC-9872) has been evaluated through in vitro antagonistic activity of cellular preparations/components against potent pathogens...
May 10, 2018: Current Microbiology
Jinxing Wang, Jidong Liang, Sha Gao
Many bacterial strains have been demonstrated to biodegrade lignin for contaminant removal or resource regeneration. The goal of this study was to investigate the biodegradation amount and associated pathways of three lignin monomers, vanillic, p-coumaric, and syringic acid by strain Sphingobacterium sp. HY-H. Vanillic, p-coumaric, and syringic acid degradation with strain HY-H was estimated as 88.71, 76.67, and 72.78%, respectively, after 96 h. Correspondingly, the same three monomers were associated with a COD removal efficiency of 87...
May 10, 2018: Current Microbiology
Jaewoo Yoon, Mina Yasumoto-Hirose, Hiroaki Kasai
In the original version of this paper, the Chemotaxonomic Characteristics in the Results and Discussion section and legend of Table 2 given in the above paper are incorrect. These errors are corrected with this erratum.
May 7, 2018: Current Microbiology
Xiao-Yun Yu, Jing-Yu Zhai, Chen Wu, Chong-Ya Zhang, Jie-Ying Shi, Lin-Xian Ding, Min Wu
A Gram-stain-negative, aerobic, rod-shaped bacterial strain, designated ZYSR67-ZT , was isolated from a pharmaceutical wastewater sample collected from a chemical factory in Zhejiang, China. The strain was motile by a single polar flagellum and grew at 4-42 °C (optimum, 35 °C), pH 5.0-9.0 (optimum, 6.0) and 0-5.0% (w/v) NaCl (optimum, 2.0%). Based on multilocus sequence analysis using 16S rRNA, gyrB, rpoB and rpoD, the strain ZYSR67-ZT formed a distinct phylogenetic group in the genus Pseudomonas. The average nucleotide identity values between strain ZYSR67-ZT and the closely related 10 type strains of the Pseudomonas species were 75...
May 3, 2018: Current Microbiology
Qinke Shen, Yuxian Wang, Jian Shen, Ling Jiang, Ce Wei, Hongman Zhang
Fatty acids (FAs) are one of the important factors that can influence cell growth and membrane composition. The aim of this study was to investigate the influence of supplementing MLM+ growth medium with C18 free fatty acids (C18 -FFAs), including stearic (C18:0), oleic (C18:1), linoleic (C18:2), and linolenic (C18:3) acid, on the growth of Lactobacillus plantarum CICC21001 by forming ion pairs with lysine to increase the solubility of FAs in liquid medium. The utilization of C18 -FFAs was further confirmed by GC-FID...
April 27, 2018: Current Microbiology
Dan-Yang Wang, Qian Wang, Jie Liu, De-Chao Zhang
The Gram-stain-negative, rod-shaped, aerobic strain, designated YC1039T , was isolated from a seamount northern Mariana Trench in the tropical western Pacific. Phylogenetic analysis based on 16S rRNA gene sequence showed that strain YC1039T was related to the genus Mesoflavibacter and had highest 16S rRNA gene sequence similarities to Mesoflavibacter sabulilitoris GJMS-9T (98.3%) and Mesoflavibacter zeaxanthinifaciens TD-ZX30T (98.2%). The predominant cellular fatty acids were iso-C15:1 G and iso-C15:0 . The polar lipid profile contained phosphatidylethanolamine, two unidentified phospholipids, and 13 unidentified lipids...
April 25, 2018: Current Microbiology
Georgina Corti Monzón, Melina Nisenbaum, M Karina Herrera Seitz, Silvia E Murialdo
The study of the aromatic compounds' degrading ability by halophilic bacteria became an interesting research topic, because of the increasing use of halophiles in bioremediation of saline habitats and effluents. In this work, we focused on the study of aromatic compounds' degradation potential of Halomonas sp. KHS3, a moderately halophilic bacterium isolated from hydrocarbon-contaminated seawater of the Mar del Plata harbour. We demonstrated that H. sp. KHS3 is able to grow using different monoaromatic (salicylic acid, benzoic acid, 4-hydroxybenzoic acid, phthalate) and polyaromatic (naphthalene, fluorene, and phenanthrene) substrates...
April 24, 2018: Current Microbiology
Chao Li, Xiaoqing Wei, Li Gao, Wanquan Chen, Taiguo Liu, Bo Liu
This is the first study of proteomics of wheat bunt fungi Tilletia controversa (TCK), T. caries (TCT), and T. foetida (TFL) using the iTRAQ technique. Based on the relative quantities of specific proteins between each two pathogens, we found 50 up-regulated and 80 down-regulated protein genes in TCK compared to TFL, 62 up-regulated and 82 down-regulated protein genes in TCT compared to TFL, 47 up-regulated and 30 down-regulated protein genes in TCK compared to TCT, and there were 1 protein of up-regulated and 4 proteins of down-regulated in the three pairs...
April 24, 2018: Current Microbiology
Maria Giovanna Schu, Martina Schrallhammer
Caedibacter taeniospiralis is an obligate bacterial symbiont living in the cytoplasm of the ciliate Paramecium tetraurelia. Different studies analyzing the effect of this symbiont on its host's growth and maximal cell density arrive at contradicting conclusions, labeling it as either a parasite or a mutualist. We address the question whether extrinsic factors such as medium and food organism are responsible for the opposing results. Thus, we performed fitness assays comparing previously applied cultivation conditions...
April 24, 2018: Current Microbiology
Elham Moazamian, Nima Bahador, Negar Azarpira, Manoochehr Rasouli
Bacillus thuringiensis is one of the most important microorganisms used against cancer cell lines in latest studies all over the world. This study aims to perform the isolation, molecular identification, and to identify novel B. thuringiensis strains that specifically targeting human cancer cell-killing activities in Iran. A total of 88 B. thuringiensis isolates were recovered from Iran. Upon the treatment of the non-hemolytic crystal proteins by proteinase K, five isolates belonging to three biotypes, thuringiensis, kurstaki and sotto of B...
April 23, 2018: Current Microbiology
Chelsea Collins, Marisa Almuzara, Mariana Saigo, Sabrina Montaña, Kevin Chiem, German Traglia, Maria Alejandra Mussi, Marcelo Tolmasky, Andres Iriarte, Carlos Vay, Maria Soledad Ramirez
The spread of antibiotic resistance is rapidly threatening the effectiveness of antibiotics in the clinical setting. Many infections are being caused by known and unknown pathogenic bacteria that are resistant to many or all antibiotics currently available. Empedobacter falsenii is a nosocomial pathogen that can cause human infections. E. falsenii Wf282 strain was found to be resistant to many antibiotics, including carbapenems and colistin. Whole-genome shotgun sequencing of the strain was performed, and distinct features were identified...
April 23, 2018: Current Microbiology
Haiyan Ni, Na Li, Jiguo Qiu, Qing Chen, Jian He
In this study, a bacterial strain P13 capable of degrading pendimethalin was isolated from the soil of a fruit garden. Based on observed cellular morphology and physiology characteristics and a phylogenetic analysis of 16S rRNA gene sequences, strain P13 was identified as a member of the genus Paracoccus. Strain P13 grew on pendimethalin as the sole carbon source, and could degrade 100 mg/L pendimethalin within 2 days and 200 mg/L pendimethalin within 5 days. Pendimethalin degradation was proposed to be initiated by oxidation ring cleavage to yield 1,3-dinitro-2-(pentan-3-ylamino)butane-1,4-diol, an alkane organic compound that was identified by ultra-high performance liquid chromatography coupled to tandem mass spectrometry (UHPLC-MS/MS), which then underwent a series of enzymatic reactions to produce CO2 and H2 O...
April 19, 2018: Current Microbiology
Danfeng Jin, Bintao Gu, Dawei Xiong, Guochang Huang, Xiaoping Huang, Lan Liu, Jun Xiao
2-Phenylethanol (2-PE) is a kind of advanced aromatic alcohol with rose fragrance, which is wildly used for the deployment of flavors and fragrances. Microbial transformation is the most feasible method for the production of natural 2-PE. But a bottleneck problem is the toxicity of 2-PE on the cells. The molecular mechanisms of the toxic effect of 2-PE to Saccharomyces cerevisiae are not well studied. In this study, we analyzed the transcriptomes of S. cerevisiae in the media with and without 2-PE, respectively, using Illumina RNA-Seq technology...
April 17, 2018: Current Microbiology
Brianne Zapata, Danya N Alvarez, Sabrina Farah, Cristina Garcia-de-la-Maria, Jose M Miro, George Sakoulas, Arnold S Bayer, Nagendra N Mishra
Among the viridans group streptococci, S. mitis-oralis strains are frequently resistant to multiple β-lactams and tolerant to vancomycin (VAN). This scenario has led to the proposed clinical use of newer agents, like daptomycin (DAP) for such S. mitis-oralis strains. However, recent recognition of the rapid and durable emergence of high-level DAP-resistance (DAP-R; DAP MICs > 256 µg/ml) induced by DAP exposures in vitro and in vivo has dampened enthusiasm for such approaches. In this study, we evaluated a broad range of DAP combination regimens in vitro for their capacity to prevent emergence of high-level DAP-R in a prototype S...
April 12, 2018: Current Microbiology
Anna Herman
This review reports cosmetic ingredients with antimicrobial activity including synthetic and natural (plant and microbial) origin as alternative for preservatives used in cosmetics as well described mechanism of their action.
April 12, 2018: Current Microbiology
Nan Chen, Zong-Xin Ling, Tong-Tong Jin, Ming Li, Sheng Zhao, Li-Shuang Zheng, Xin Xi, Lin-Lin Wang, Ying-Ying Chen, Yue-Liang Shen, Li-Ping Zhang, Shao-Cong Sun
Intestinal microbiota plays a crucial role in preventing the colonization and invasion by pathogens, and disruption of microbiota may cause opportunistic infections and diseases. Pathogens often have strategies to escape from the colonization resistance mediated by microbiota, but whether they also modulate the microbiota composition is still a topic of investigation. In the present study, we addressed this question using an opportunistic pathogen, Klebsiella pneumoniae serotype K1, which is known to cause pyogenic liver abscess (KLA) in about 30% of mice...
April 10, 2018: Current Microbiology
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