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https://www.readbyqxmd.com/read/29778165/simultaneous-pyridine-biodegradation-and-nitrogen-removal-in-an-aerobic-granular-system
#1
Xiaodong Liu, Shijing Wu, Dejin Zhang, Jinyou Shen, Weiqing Han, Xiuyun Sun, Jiansheng Li, Lianjun Wang
Simultaneous pyridine biodegradation and nitrogen removal were successfully achieved in a sequencing batch reactor (SBR) based on aerobic granules. In a typical SBR cycle, nitritation occurred obviously after the majority of pyridine was removed, while denitrification occurred at early stage of the cycle when oxygen consumption was aggravated. The effect of several key operation parameters, i.e., air flow rate, influent NH4 + -N concentration, influent pH and pyridine concentration, on nitritation, pyridine degradation and total nitrogen (TN) removal, was systematically investigated...
May 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/29751066/keeping-it-together-absence-of-genetic-variation-and-dna-incorporation-by-the-predatory-bacteria-micavibrio-aeruginosavorus-and-bdellovibrio-bacteriovorus-during-predation
#2
Shilpi Gupta, Alexander Lemenze, Robert J Donnelly, Nancy D Connell, Daniel E Kadouri
The use of predatory bacteria as a potential live therapeutic to control human infection is gaining increased attention. Earlier work with Micavibrio spp. and Bdellovibrio spp. has demonstrated the ability of these predators to control drug-resistant Gram-negative pathogens, Tier-1 select agents and biofilms. Additional studies also confirmed that introducing high doses of the predators into animals does not negatively impact animal well-being and might assist in reducing bacterial burden in vivo. The survival of predators requires extreme proximity to the prey cell, which might bring about horizontal transfer of genetic material, such as genes encoding for pathogenic genetic islands that would indirectly facilitate the spread of genetic material to other organisms...
May 8, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29679930/mixed-culture-polyhydroxyalkanoate-pha-synthesis-from-nutrient-rich-wet-oxidation-liquors
#3
Suren Wijeyekoon, Carlo R Carere, Mark West, Shresta Nath, Daniel Gapes
Organic waste residues can be hydrothermally treated to produce organic acid rich liquors. These hydrothermal liquors are a potential feedstock for polyhydroxyalkanoate (PHA) production. We investigated the effect of dissolved oxygen concentration and substrate feeding regimes on PHA accumulation and yield using two hydrothermal liquors derived from a mixture of primary and secondary municipal wastewater treatment sludge and food waste. The enriched culture accumulated a maximum of 41% PHA of cell dry weight within 7 h; which is among the highest reported for N and P rich hydrothermal liquors...
April 12, 2018: Water Research
https://www.readbyqxmd.com/read/29545525/microbial-dynamics-and-metabolite-changes-in-chinese-rice-wine-fermentation-from-sorghum-with-different-tannin-content
#4
Jialiang Xu, Huijun Wu, Zhiwei Wang, Fuping Zheng, Xin Lu, Zhenpeng Li, Qing Ren
Chinese rice wine (CRW) is the oldest kind of wine in China and is mainly fermented by wheat Qu and yeast with rice, millet, etc. This gives CRW a unique quality, but the flavor components are complex. Its formation is related to microorganisms, but the link between CRW and microorganisms is poorly understood. Here, we used two kinds of sorghum (JZ22 and JB3, of which JZ22 has a higher tannin content) as the raw materials to brew and determined the structural and functional dynamics of the microbiota by metagenomics and flavor analyses...
March 15, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29498744/behaviour-of-bdellovibrio-bacteriovorus-in-the-presence-of-gram-positive-staphylococcus-aureus
#5
Fabrizio Pantanella, Valerio Iebba, Francesco Mura, Luciana Dini, Valentina Totino, Bruna Neroni, Giulia Bonfiglio, Trancassini Maria, Claudio Passariello, Serena Schippa
The present study aimed to characterize the behavior of Bdellovibrio bacteriovorus in the presence of Staphylococcus aureus. B. bacteriovorus was co-cultured with S. aureus or Pseudomonas aeruginosa or Streptococcus mutans, in planktonic and sessile conditions. Co-cultures were studied by Field-Emission Scanning Electron Microscopy (FESEM), Scanning Transmission Electron Microscopy (STEM), turbidimetry, quantitative PCR (qPCR), and sequencing of gene Bd0108 of B. bacteriovorus. Results indicated that B. bacteriovorus comparably inhibited planktonic growth of P...
March 2, 2018: New Microbiologica
https://www.readbyqxmd.com/read/29446192/increasing-the-autotrophic-growth-of-chlorella-ustb-01-via-the-control-of-bacterial-contamination-by-bdellovibrio-ustb-06
#6
Y Li, F Qiu, H Yan, X Wan, M Wang, K Ren, Q Xu, L Lv, C Yin, X Liu, H Zhang, K Mahmoud
AIMS: (i) To obtain and identify the predatory bacteria for the control of contaminated bacteria and to promote the autotrophic growth of Chlorella USTB-01. (ii) To identify and measure the different cell numbers in microalgal culture using flow cytometer. METHODS AND RESULTS: A predatory bacterial strain was isolated using Escherichia coli BL21 as a sole prey host, which was identified as Bdellovibrio USTB-06 by the analysis of 16S rDNA sequence. A flow cytometer was successfully used to identify and measure the cell numbers of Chlorella USTB-01, the contaminated bacteria and Bdellovibrio USTB-06 simultaneously in the autotrophic culture of Chlorella USTB-01 according to the identification of the different cell sizes...
May 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29311645/author-correction-fluorescent-d-amino-acids-reveal-bi-cellular-cell-wall-modifications-important-for-bdellovibrio-bacteriovorus-predation
#7
Erkin Kuru, Carey Lambert, Jonathan Rittichier, Rob Till, Adrien Ducret, Adeline Derouaux, Joe Gray, Jacob Biboy, Waldemar Vollmer, Michael VanNieuwenhze, Yves V Brun, R Elizabeth Sockett
In the original version of this Article, a grant number and acknowledgement were omitted. The Acknowledgements section should have stated that one of the 3D SIM microscopes used for this research was supported by Medical Research Council UK grant (MR/K015753/1) to S. Foster, University of Sheffield, UK, and that the authors thank C. Walther and S. Foster for the access and their kind help with this. This has now been corrected in all versions of the Article.
February 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29311627/evolution-of-higher-torque-in-campylobacter-type-bacterial-flagellar-motors
#8
Bonnie Chaban, Izaak Coleman, Morgan Beeby
Understanding the evolution of molecular machines underpins our understanding of the development of life on earth. A well-studied case are bacterial flagellar motors that spin helical propellers for bacterial motility. Diverse motors produce different torques, but how this diversity evolved remains unknown. To gain insights into evolution of the high-torque ε-proteobacterial motor exemplified by the Campylobacter jejuni motor, we inferred ancestral states by combining phylogenetics, electron cryotomography, and motility assays to characterize motors from Wolinella succinogenes, Arcobacter butzleri and Bdellovibrio bacteriovorus...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29259082/cyanide-production-by-chromobacterium-piscinae-shields-it-from-bdellovibrio-bacteriovorus-hd100-predation
#9
Wonsik Mun, Heeun Kwon, Hansol Im, Seong Yeol Choi, Ajay K Monnappa, Robert J Mitchell
Predation of Chromobacterium piscinae by Bdellovibrio bacteriovorus HD100 was inhibited in dilute nutrient broth (DNB) but not in HEPES. Experiments showed that the effector responsible was present in the medium, as cell-free supernatants retained the ability to inhibit predation, and that the effector was not toxic to B. bacteriovorus Violacein, a bisindole secondary metabolite produced by C. piscinae , was not responsible. Further characterization of C. piscinae found that this species produces sufficient concentrations of cyanide (202 µM) when grown in DNB to inhibit the predatory activity of B...
December 19, 2017: MBio
https://www.readbyqxmd.com/read/29214487/effects-of-dietary-poly-%C3%AE-hydroxybutyrate-phb-on-microbiota-composition-and-the-mtor-signaling-pathway-in-the-intestines-of-litopenaeus-vannamei
#10
Yafei Duan, Yue Zhang, Hongbiao Dong, Yun Wang, Jiasong Zhang
Poly-β-hydroxybutyrate (PHB) is a natural polymer of the short chain fatty acid β-hydroxybutyrate, which acts as a microbial control agent. The mammalian target of the rapamycin (mTOR) signaling pathway plays a crucial role in intestine inflammation and epithelial morphogenesis. In this study, we examined the composition of intestine microbiota, and mTOR signaling-related gene expression in Pacific white shrimp Litopenaeus vannamei fed diets containing different levels of PHB: 0% (Control), 1% (PHB1), 3% (PHB3), and 5% (PHB5) (w/w) for 35 days...
December 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/29212086/comparative-analyses-of-transport-proteins-encoded-within-the-genomes-of-bdellovibrio-bacteriovorus-hd100-and-bdellovibrio-exovorus-jss
#11
Fereshteh Heidari Tajabadi, Arturo Medrano-Soto, Masoud Ahmadzadeh, Gholamreza Salehi Jouzani, Milton H Saier
Bdellovibrio, δ-proteobacteria, including B. bacteriovorus (Bba) and B. exovorus (Bex), are obligate predators of other Gram-negative bacteria. While Bba grows in the periplasm of the prey cell, Bex grows externally. We have analyzed and compared the transport proteins of these 2 organisms based on the current contents of the Transporter Classification Database (TCDB; www.tcdb.org). Bba has 103 transporters more than Bex, 50% more secondary carriers, and 3 times as many MFS carriers. Bba has far more metabolite transporters than Bex as expected from its larger genome, but there are 2 times more carbohydrate uptake and drug efflux systems, and 3 times more lipid transporters...
2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29151063/predation-among-microorganisms-a-huge-potential-of-interspecies-dependencies
#12
Justyna Kowalska, Marcin Włodarczyk
There are many interactions between species (including bacteria) in the environment. One of them is predation, which always leads to the death of a prey. Described in this review Bdellovibrio bacteriovorus (Deltaproteobacteria) and Micavibrio aeruginosavorus (Alfaproteobacteria) are uniflagellate, rod shaped and curved obligate predators of Gram-negative bacteria. Both species belong to the group of BALOs (Bdellovibrio and like organisms). B. bacteriovorus use periplasmic predatory strategy and M. aeruginosavorus are epibiotic hunters...
November 3, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/29131976/purification-of-eutrophic-water-containing-chlorpyrifos-by-aquatic-plants-and-its-effects-on-planktonic-bacteria
#13
Xing-Jian Xu, Guo-Li Lai, Chang-Qiao Chi, Jie-Yu Zhao, Ying-Chun Yan, Yong Nie, Xiao-Lei Wu
In this study, the removal of nutrients and chlorpyrifos as well as shifts of planktonic bacterial communities in constructed microcosms were investigated to evaluate the influence of Phragmites australis, Nymphaea alba, and Myriophyllum verticillatum, and their combination, on the restoration of eutrophic water containing chlorpyrifos. Plant-treated groups showed a higher pollutant removal rate than did no-remediation controls, indicating that treatment with plants is effective at remediation of eutrophic water containing chlorpyrifos...
February 2018: Chemosphere
https://www.readbyqxmd.com/read/29124413/assessment-of-bacterial-diversity-in-hyalomma-aegyptium-h-marginatum-and-h-excavatum-ticks-through-tag-encoded-pyrosequencing
#14
Adem Keskin, Ahmet Bursali, David E Snow, Scot E Dowd, Saban Tekin
Ticks are among the most significant human-biting ectoparasites and they play a major role in transmission of many pathogenic agents to humans. In the present study, three species of Hyalomma ticks, Hyalomma aegyptium, H. marginatum and H. excavatum, were examined for the presence of zoonotic bacteria, both male and female ticks alike. Examination of microbial diversity with tag-encoded pyrosequencing indicates that H. marginatum and H. excavatum were more diversity rich than H. aegyptium. Although numerous pathogenic and non-pathogenic bacterial genera were detected, including Acidovorax, Bacillus, Bacteroides, Bdellovibrio, Clostridium, Curvibacter, Escherichia, Flavobacterium, Limnohabitans, Paenibacillus, Ralstonia, Sarcina, Sediminibacterium, Segetibacter Stenotrophomonas and Variovorax, the predominant zoonotic bacteria represented in these ticks were genera Borrelia, Francisella, and Rickettsia...
December 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/29089523/combined-application-of-bacterial-predation-and-violacein-to-kill-polymicrobial-pathogenic-communities
#15
Hansol Im, Seong Yeol Choi, Sangmo Son, Robert J Mitchell
Violacein is a bisindole antibiotic that is effective against Gram-positive bacteria while the bacterial predator, Bdellovibrio bacteriovorus HD100, predates on Gram-negative strains. In this study, we evaluated the use of both together against multidrug resistant pathogens. The two antibacterial agents did not antagonize the activity of the other. For example, treatment of Staphylococcus aureus with violacein reduced its viability by more than 2,000-fold with or without B. bacteriovorus addition. Likewise, predation of Acinetobacter baumannii reduced the viability of this pathogen by more than 13,000-fold, regardless if violacein was present or not...
October 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28974693/fluorescent-d-amino-acids-reveal-bi-cellular-cell-wall-modifications-important-for-bdellovibrio-bacteriovorus-predation
#16
Erkin Kuru, Carey Lambert, Jonathan Rittichier, Rob Till, Adrien Ducret, Adeline Derouaux, Joe Gray, Jacob Biboy, Waldemar Vollmer, Michael VanNieuwenhze, Yves V Brun, R Elizabeth Sockett
Modification of essential bacterial peptidoglycan (PG)-containing cell walls can lead to antibiotic resistance; for example, β-lactam resistance by L,D-transpeptidase activities. Predatory Bdellovibrio bacteriovorus are naturally antibacterial and combat infections by traversing, modifying and finally destroying walls of Gram-negative prey bacteria, modifying their own PG as they grow inside prey. Historically, these multi-enzymatic processes on two similar PG walls have proved challenging to elucidate. Here, with a PG-labelling approach utilizing timed pulses of multiple fluorescent D-amino acids, we illuminate dynamic changes that predator and prey walls go through during the different phases of bacteria:bacteria invasion...
December 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28951476/individual-patterns-of-complexity-in-cystic-fibrosis-lung-microbiota-including-predator-bacteria-over-a-1-year-period
#17
Juan de Dios Caballero, Rafael Vida, Marta Cobo, Luis Máiz, Lucrecia Suárez, Javier Galeano, Fernando Baquero, Rafael Cantón, Rosa Del Campo
Cystic fibrosis (CF) lung microbiota composition has recently been redefined by the application of next-generation sequencing (NGS) tools, identifying, among others, previously undescribed anaerobic and uncultivable bacteria. In the present study, we monitored the fluctuations of this ecosystem in 15 CF patients during a 1-year follow-up period, describing for the first time, as far as we know, the presence of predator bacteria in the CF lung microbiome. In addition, a new computational model was developed to ascertain the hypothetical ecological repercussions of a prey-predator interaction in CF lung microbial communities...
September 26, 2017: MBio
https://www.readbyqxmd.com/read/28919044/susceptibility-of-colistin-resistant-pathogens-to-predatory-bacteria
#18
Sonal Dharani, Dong Hyun Kim, Robert M Q Shanks, Yohei Doi, Daniel E Kadouri
The increase in multidrug-resistant Gram-negative bacterial infections has forced the reintroduction of antibiotics such as colistin. However, the spread of the plasmid-borne mcr-1 colistin resistance gene have moved us closer to an era of untreatable Gram-negative infections. To evaluate whether predatory bacteria could be used as a potential therapeutic to treat this upcoming threat, the ability of Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus to prey on several clinically relevant mcr-1-positive, colistin-resistant isolates was evaluated...
January 2018: Research in Microbiology
https://www.readbyqxmd.com/read/28886689/predator-versus-pathogen-how-does-predatory-bdellovibrio-bacteriovorus-interface-with-the-challenges-of-killing-gram-negative-pathogens-in-a-host-setting
#19
David Negus, Chris Moore, Michelle Baker, Dhaarini Raghunathan, Jess Tyson, R Elizabeth Sockett
Bdellovibrio bacteriovorus is a small deltaproteobacterial predator that has evolved to invade, reseal, kill, and digest other gram-negative bacteria in soils and water environments. It has a broad host range and kills many antibiotic-resistant, clinical pathogens in vitro, a potentially useful capability if it could be translated to a clinical setting. We review relevant mechanisms of B. bacteriovorus predation and the physiological properties that would influence its survival in a mammalian host. Bacterial pathogens increasingly display conventional antibiotic resistance by expressing and varying surface and soluble biomolecules...
September 8, 2017: Annual Review of Microbiology
https://www.readbyqxmd.com/read/28871435/comparison-of-the-bacterial-community-composition-in-the-granular-and-the-suspended-phase-of-sequencing-batch-reactors
#20
Enikö Szabó, Raquel Liébana, Malte Hermansson, Oskar Modin, Frank Persson, Britt-Marie Wilén
Granulation of activated sludge is an increasingly important area within the field of wastewater treatment. Granulation is usually achieved by high hydraulic selection pressure, which results in the wash-out of slow settling particles. The effect of the harsh wash-out conditions on the granular sludge ecosystem is not yet fully understood, but different bacterial groups may be affected to varying degrees. In this study, we used high-throughput amplicon sequencing to follow the community composition in granular sludge reactors for 12 weeks, both in the granular phase and the suspended phase (effluent)...
September 5, 2017: AMB Express
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