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BMC Microbiology

Konrad M Wanka, Thilo Damerau, Benjamin Costas, Angela Krueger, Carsten Schulz, Sven Wuertz
BACKGROUND: Innovations in fish nutrition act as drivers for the sustainable development of the rapidly expanding aquaculture sector. Probiotic dietary supplements are able to improve health and nutrition of livestock, but respective bacteria have mainly been isolated from terrestrial, warm-blooded hosts, limiting an efficient application in fish. Native probiotics adapted to the gastrointestinal tract of the respective fish species will establish within the original host more efficiently...
September 20, 2018: BMC Microbiology
Ivan D Valdes, Joris van den Berg, Annika Haagsman, Natalia Escobar, Jacques F Meis, Ferry Hagen, Pieter Jan Haas, Jos Houbraken, Han A B Wösten, Hans de Cock
BACKGROUND: Aspergillus fumigatus is a ubiquitous saprotrophic fungus and an opportunistic pathogen of humans and animals. Humans and animals can inhale hundreds of A. fumigatus spores daily. Normally this is harmless for humans, but in case of immunodeficiency, invasive pulmonary aspergillosis (IPA) can develop with a high mortality rate. A. fumigatus also causes non-invasive mycoses like sino-nasal aspergillosis (SNA) in dogs. RESULTS: In this study we compared A...
September 17, 2018: BMC Microbiology
Lyssa Y Baker, Chelsea R Hobby, Andrew W Siv, William C Bible, Michael S Glennon, Derek M Anderson, Steven J Symes, David K Giles
BACKGROUND: Pseudomonas aeruginosa, a common opportunistic pathogen, is known to cause infections in a variety of compromised human tissues. An emerging mechanism for microbial survival is the incorporation of exogenous fatty acids to alter the cell's membrane phospholipid profile. With these findings, we show that exogenous fatty acid exposure leads to changes in bacterial membrane phospholipid structure, membrane permeability, virulence phenotypes and consequent stress responses that may influence survival and persistence of Pseudomonas aeruginosa...
September 14, 2018: BMC Microbiology
Qi Wang, Fei Li, Bishan Liang, Yuhu Liang, Sijie Chen, Xiaodong Mo, Yanmei Ju, Hui Zhao, Huijue Jia, Timothy D Spector, Hailiang Xie, Ruijin Guo
BACKGROUND: Asthma, one of the most common chronic respiratory disorders, is associated with the hyper-activation of the T-cell subset of adaptive immunity. The gut microbiota may be involved in the development of asthma through the production of short-chain fatty acids (SCFAs), exhibiting modulatory effects on Th. So, we performed a metagenome-wide association study (MWAS) of the fecal microbiota from individuals with asthma and healthy controls. And that was the first case to resolve the relationship between asthma and microbiome among UK adults...
September 12, 2018: BMC Microbiology
Miriam Khider, Nils Peder Willassen, Hilde Hansen
BACKGROUND: Quorum sensing (QS) is a cell-to cell communication system that bacteria use to synchronize activities as a group. LitR, the master regulator of QS in Aliivibrio salmonicida, was recently shown to regulate activities such as motility, rugosity and biofilm formation in a temperature dependent manner. LitR was also found to be a positive regulator of rpoQ. RpoQ is an alternative sigma factor belonging to the sigma -70 family. Alternative sigma factors direct gene transcription in response to environmental signals...
September 12, 2018: BMC Microbiology
Suzanne M Kosina, Annette M Greiner, Rebecca K Lau, Stefan Jenkins, Richard Baran, Benjamin P Bowen, Trent R Northen
BACKGROUND: As microbiome research becomes increasingly prevalent in the fields of human health, agriculture and biotechnology, there exists a need for a resource to better link organisms and environmental chemistries. Exometabolomics experiments now provide assertions of the metabolites present within specific environments and how the production and depletion of metabolites is linked to specific microbes. This information could be broadly useful, from comparing metabolites across environments, to predicting competition and exchange of metabolites between microbes, and to designing stable microbial consortia...
September 12, 2018: BMC Microbiology
Anastasia-Lisa Lübke, Sabrina Minatelli, Thomas Riedel, Raimond Lugert, Isabel Schober, Cathrin Spröer, Jörg Overmann, Uwe Groß, Andreas E Zautner, Wolfgang Bohne
BACKGROUND: Campylobacter jejuni is one of the most common bacterial causes of food-borne enteritis worldwide. Chemotaxis in C. jejuni is known to be critical for the successful colonization of the host and key for the adaptation of the microbial species to different host environments. In C. jejuni, chemotaxis is regulated by a complex interplay of 13 or even more different chemoreceptors, also known as transducer-like proteins (Tlps). Recently, a novel chemoreceptor gene, tlp12, was described and found to be present in 29...
September 10, 2018: BMC Microbiology
Canfeng Hua, Yali Geng, Qu Chen, Liqiong Niu, Liuping Cai, Shiyu Tao, Yingdong Ni, Ruqian Zhao
BACKGROUND: Dexamethasone (Dex), an artificially synthetic cortisol substitute, is commonly used as an anti-inflammatory drug, and is also employed to mimic the stress state experimentally. It is well known that chronic stress disturbs the gut microbiota community and digestive functions. However, no relevant studies have been conducted in ruminants. RESULTS: In this study, a low dosage of Dex (0.2 mg/kg body weight, Dex group, n = 5) was consecutively injected intramuscularly for 21 days to simulate chronic stress in growing goats...
September 10, 2018: BMC Microbiology
Song Yang, Jie Du, Yuan-Liang Duan, Qing Xiao, Ning-Qiu Li, Qiang Lin, Liu-Lan Zhao, Zong-Jun Du, Jian Zhou, Jun Du
BACKGROUND: Fish culture in rice paddies can contribute to increasing yields of rice and surplus fish products. Environmental impacts and food-safety issues have become important topics in aquaculture, and organic foods currently were paid attention by researchers and industry practitioners. But the mechanism of differences in quality of Loach (Paramisgurnus dabryanus) reared in rice fields and ponds remains largely uncharacterized. In this study,digestive enzyme activity, intestinal mucosa cells and the gut microbial community of loach were determined under the two separate cultivation modes...
September 10, 2018: BMC Microbiology
Joanna W Szopinska, Raphaële Gresse, Saskia van der Marel, Jos Boekhorst, Sabina Lukovac, Iris van Swam, Barbara Franke, Harro Timmerman, Clara Belzer, Alejandro Arias Vasquez
BACKGROUND: The effects of gut microbiota on human traits are expected to be small to moderate and adding the complexity of the human diseases, microbiome research demands big sample sizes. Fecal samples for such studies are mostly self-collected by participants at home. This imposes an extra level of complexity as sample collection and storage can be challenging. Effective, low-burden collection and storage methods allowing fecal samples to be transported properly and ensuring optimal quality and quantity of bacterial DNA for upstream analyses are necessary...
September 6, 2018: BMC Microbiology
Dayong Ren, Shengjie Gong, Jingyan Shu, Jianwei Zhu, Hongyan Liu, Ping Chen
BACKGROUND: The stability of intestinal microorganisms plays an important role in human health, as the intestines perform important functions in the human body. Staphylococcus aureus is a Gram-positive, facultative anaerobic bacteria, it causes human infection worldwide, and is a major pathogen that causes intestinal infection. Mixed lactic acid bacteria (LAB) may have potential in the prevention and treatment of S. aureus infection. In the present study, we examined the effects of mixed LAB treatment on intestinal microbiota modulation in mice infected with S...
September 6, 2018: BMC Microbiology
Mónica A Vásquez-Piñeros, Paula M Martínez-Lavanchy, Nico Jehmlich, Dietmar H Pieper, Carlos A Rincón, Hauke Harms, Howard Junca, Hermann J Heipieper
BACKGROUND: Dimethylphenols (DMP) are toxic compounds with high environmental mobility in water and one of the main constituents of effluents from petro- and carbochemical industry. Over the last few decades, the use of constructed wetlands (CW) has been extended from domestic to industrial wastewater treatments, including petro-carbochemical effluents. In these systems, the main role during the transformation and mineralization of organic pollutants is played by microorganisms. Therefore, understanding the bacterial degradation processes of isolated strains from CWs is an important approach to further improvements of biodegradation processes in these treatment systems...
September 6, 2018: BMC Microbiology
Linda Hadjadj, Sofiane Bakour, Jean-Marc Rolain
BACKGROUND: Acinetobacter baumannii is an important opportunistic pathogen that is rapidly evolving towards multidrug resistance and is responsible for life-threatening infections. Carbapenems are commonly used to treat A. baumannii infections but the emergence of carbapenemase encoding genes, such as blaOXA-23-like , blaOXA-24-like, blaOXA-58-like, and blaNDM has been reported. Moreover, several studies have reported the co-occurrence of two distinct carbapenemases in some isolates. The aim of the present study is to demonstrate whether the phenomenon of co-occurrence of two distinct carbapenemase encoding genes in a single isolate still exists...
September 5, 2018: BMC Microbiology
Dulanthi Weerasekera, Franziska Stengel, Heinrich Sticht, Ana Luíza de Mattos Guaraldi, Andreas Burkovski, Camila Azevedo Antunes
BACKGROUND: Corynebacterium diphtheriae is the etiologic agent of diphtheria and different systemic infections. The bacterium has been classically described as an extracellular pathogen. However, a number of studies revealed its ability to invade epithelial cells, indicating a more complex pathogen-host interaction. The molecular mechanisms controlling and facilitating internalization of C. diphtheriae still remains unclear. Recently, the DIP0733 transmembrane protein was found to play an important role in the interaction with matrix proteins and cell surfaces, nematode colonization, cellular internalization and induction of cell death...
September 4, 2018: BMC Microbiology
Saurav Das, Madhumita Barooah
BACKGROUND: Microorganisms specifically bacteria play a crucial role in arsenic mobilization and its distribution in aquatic systems. Although bacteria are well known for their active participation in the different biogeochemical cycles, the role of these bacteria in regulating the concentration of arsenic in Brahmaputra valley has not been investigated in detail. RESULTS: In this paper, we report the isolation of an arsenic resistant bacterium TA6 which can efficiently reduce arsenate...
September 4, 2018: BMC Microbiology
Xuan Wang, Liyuan Zhang, Hongtao Ji, Xuyan Mo, Ping Li, Junzhi Wang, Hansong Dong
BACKGROUND: Pathogenic Gram-negative bacteria interact with their eukaryotic hosts by deploying the type III translocon to inject effector proteins into the cytosol of eukaryotic cells. The translocon compositions, the number and biochemical characteristics of type III translocators in animal-pathogenic bacteria have been well elucidated, but information is lacking for plant-pathogenic bacteria. With extensive studies on biological functions of the Hpa1 protein secreted by the type III secretion system in Xanthomonas oryzae pv...
September 4, 2018: BMC Microbiology
Taru Lienemann, Wolfgang Beyer, Kirsti Pelkola, Heidi Rossow, Alexandra Rehn, Markus Antwerpen, Gregor Grass
BACKGROUND: Anthrax, the zoonotic disease caused by the gram-positive bacterium Bacillus anthracis, is nowadays rare in northern parts of Europe including Finland and Scandinavia. Only two minor outbreaks of anthrax in 1988 and in 2004 and one sporadic infection in 2008 have been detected in animals in Finland since the 1970's. Here, we report on two Finnish B. anthracis strains that were isolated from spleen and liver of a diseased calf related to the outbreak in 1988 (strain HKI4363/88) and from a local scrotum and testicle infection of a bull in 2008 (strain BA2968)...
September 3, 2018: BMC Microbiology
Haixu Xu, Fang Tang, Jianjun Dai, Chengming Wang, Xin Zhou
BACKGROUND: Escherichia coli (E. coli) is one of the best-known zoonotic bacterial species, which pathogenic strain can cause infections in humans and animals. However, existing technologies or methods are deficient for quickly on-site identifying infection of E. coli before they breakout. Herein, we present an ultrasensitive and on-site method for counting E. coli using magnetic nanoparticle (MNP) probe under a dark-field in 30 min. RESULTS: The antibodies functionalized MNP, binding to E...
September 3, 2018: BMC Microbiology
Kouhei Tsuchiya, Yang-Yang Cao, Masaomi Kurokawa, Kazuha Ashino, Tetsuya Yomo, Bei-Wen Ying
BACKGROUND: Bacterial growth is an important topic in microbiology and of crucial importance to better understand living cells. Bacterial growth dynamics are quantitatively examined using various methods to determine the physical, chemical or biological features of growing populations. Due to methodological differences, the exponential growth rate, which is a parameter that is representative of growth dynamics, should be differentiated. Ignoring such differentiation in the growth analysis might overlook somehow slight but significant changes in cellular features of the growing population...
September 3, 2018: BMC Microbiology
Bo-Le Jiang, Guo-Feng Jiang, Wei Liu, Li-Chao Yang, Li-Yan Yang, Lin Wang, Xiao-Hong Hang, Ji-Liang Tang
BACKGROUND: The Gram-negative phytopathogenic bacterium Xanthomonas campestris pv. campestris recruits the hrp/T3SS system to inject pathogenicity effector proteins into host cells and uses the rpf/DSF cell-cell signaling system to regulate the expression of virulence factors such as extracellular enzymes and polysaccharide. Whether these two systems have any connection is unknown. METHODS: Positive regulator candidates affecting hrpX expression were identified by sacB strategy...
September 3, 2018: BMC Microbiology
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