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https://www.readbyqxmd.com/read/27915281/effects-of-predation-and-dispersal-on-bacterial-abundance-and-contaminant-biodegradation
#1
Sally Otto, Hauke Harms, Lukas Y Wick
Research into the biodegradation of soil contaminants has rarely addressed the consequences of predator-prey interactions. Here, we investigated the joint effect of predation and dispersal networks on contaminant degradation by linking spatial abundances of degrader (Pseudomonas fluorescens) and predator (Bdellovibrio bacteriovorus) bacteria to the degradation of the major soil contaminant phenanthrene (PHE). We used a laboratory microcosm with a PHE passive dosing system and a glass fiber network to facilitate bacterial dispersal...
December 2, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27889262/injections-of-predatory-bacteria-work-alongside-host-immune-cells-to-treat-shigella-infection-in-zebrafish-larvae
#2
Alexandra R Willis, Christopher Moore, Maria Mazon-Moya, Sina Krokowski, Carey Lambert, Robert Till, Serge Mostowy, R Elizabeth Sockett
Bdellovibrio bacteriovorus are predatory bacteria that invade and kill a range of Gram-negative bacterial pathogens in natural environments and in vitro [1, 2]. In this study, we investigated Bdellovibrio as an injected, antibacterial treatment in vivo, using zebrafish (Danio rerio) larvae infected with an antibiotic-resistant strain of the human pathogen Shigella flexneri. When injected alone, Bdellovibrio can persist for more than 24 hr in vivo yet exert no pathogenic effects on zebrafish larvae. Bdellovibrio injection of zebrafish containing a lethal dose of Shigella promotes pathogen killing, leading to increased zebrafish survival...
November 22, 2016: Current Biology: CB
https://www.readbyqxmd.com/read/27834203/predatory-bacteria-attenuate-klebsiella-pneumoniae-burden-in-rat-lungs
#3
Kenneth Shatzkes, Eric Singleton, Chi Tang, Michael Zuena, Sean Shukla, Shilpi Gupta, Sonal Dharani, Onoyom Onyile, Joseph Rinaggio, Nancy D Connell, Daniel E Kadouri
: Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus are predatory bacteria that naturally-and obligately-prey on other Gram-negative bacteria, and their use has been proposed as a potential new approach to control microbial infection. The ability of predatory bacteria to prey on Gram-negative human pathogens in vitro is well documented; however, the in vivo safety and efficacy of predatory bacteria have yet to be fully assessed. In this study, we examined whether predatory bacteria can reduce bacterial burden in the lungs in an in vivo mammalian system...
November 8, 2016: MBio
https://www.readbyqxmd.com/read/27825775/analysis-of-gene-gain-and-loss-in-the-evolution-of-predatory-bacteria
#4
Nan Li, Kai Wang, Henry N Williams, Jun Sun, Changling Ding, Xiaoyun Leng, Ke Dong
Predatory bacteria are ubiquitously distributed in nature in including in aquatic environments, sewage, intestinal tracts of animals and humans, rhizophere and, soils. However, our understanding of their evolutionary history is limited. Results of recent studies have shown that acquiring novel genes is a major force driving bacterial evolution. Therefore, to gain a better understanding of the impact of gene gain and loss in the evolution of bacterial predators, this study employed comparative genomic approaches to identify core-set gene families and species-specific gene families, and model gene gain and loss events among 11 genomes that represented diverse lineages...
November 5, 2016: Gene
https://www.readbyqxmd.com/read/27824344/catch-me-if-you-can-dispersal-and-foraging-of-bdellovibrio-bacteriovorus-109j-along-mycelia
#5
Sally Otto, Estelle P Bruni, Hauke Harms, Lukas Y Wick
To cope with heterogeneous environments and resource distributions, filamentous fungi have evolved a spatially extensive growth enabling their hyphae to penetrate air-water interfaces and pass through air-filled pores. Such mycelia are also known to act as dispersal networks for the mobilisation of bacteria ('fungal highways') and connection of microbial microhabitats. Hitherto, however, nothing is known about the effect of mycelia-based dispersal on interactions between bacterial predators and their prey and concomitant effects on biomass formation...
November 8, 2016: ISME Journal
https://www.readbyqxmd.com/read/27629536/investigating-the-responses-of-human-epithelial-cells-to-predatory-bacteria
#6
Ajay K Monnappa, Wasimul Bari, Seong Yeol Choi, Robert J Mitchell
One beguiling alternative to antibiotics for treating multi-drug resistant infections are Bdellovibrio-and-like-organisms (BALOs), predatory bacteria known to attack human pathogens. Consequently, in this study, the responses from four cell lines (three human and one mouse) were characterized during an exposure to different predatory bacteria, Bdellovibrio bacteriovorus HD100, Bacteriovorus BY1 and Bacteriovorax stolpii EB1. TNF-α levels were induced in Raw 264.7 mouse macrophage cultures with each predator, but paled in comparison to those obtained with E...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27580114/efficacy-of-bdellovibrio-bacteriovorus-109j-for-the-treatment-of-dairy-calves-with-experimentally-induced-infectious-bovine-keratoconjunctivitis
#7
Mélanie J Boileau, Rinosh Mani, Melanie A Breshears, Margi Gilmour, Jared D Taylor, Kenneth D Clinkenbeard
OBJECTIVE To determine the efficacy of Bdellovibrio bacteriovorus 109J for the treatment of calves with experimentally induced infectious bovine keratoconjunctivitis (IBK). ANIMALS 12 healthy dairy calves. PROCEDURES For each calf, a grid keratotomy was performed on both eyes immediately before inoculation with Moraxella bovis hemolytic strain Epp63-300 (n = 11 calves) or nonhemolytic strain 12040577 (1 calf). For each calf inoculated with M bovis Epp63-300, the eyes were randomly assigned to receive an artificial tear solution with (treatment group) or without (control group) lyophilized B bacteriovorus 109J...
September 2016: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/27579919/effect-of-predatory-bacteria-on-human-cell-lines
#8
Shilpi Gupta, Chi Tang, Michael Tran, Daniel E Kadouri
Predatory bacteria are Gram-negative bacteria that prey on other Gram-negative bacteria and have been considered as potential therapeutic agents against multi-drug resistant pathogens. In vivo animal models have demonstrated that predatory bacteria are non-toxic and non-immunogenic in rodents. In order to consider the use of predatory bacteria as live antibiotics, it is important to investigate their effect on human cells. The aim of this study was to determine the effect of Bdellovibrio bacteriovorus strains 109J and HD100, and Micavibrio aeruginosavorus strain ARL-13 on cell viability and inflammatory responses of five human cell lines, representative of clinically relevant tissues...
2016: PloS One
https://www.readbyqxmd.com/read/27527833/predatory-bacteria-are-nontoxic-to-the-rabbit-ocular-surface
#9
Eric G Romanowski, Nicholas A Stella, Kimberly M Brothers, Kathleen A Yates, Martha L Funderburgh, James L Funderburgh, Shilpi Gupta, Sonal Dharani, Daniel E Kadouri, Robert M Q Shanks
Given the increasing emergence of antimicrobial resistant microbes and the near absent development of new antibiotic classes, innovative new therapeutic approaches to address this global problem are necessary. The use of predatory bacteria, bacteria that prey upon other bacteria, is gaining interest as an "out of the box" therapeutic treatment for multidrug resistant pathogenic bacterial infections. Before a new antimicrobial agent is used to treat infections, it must be tested for safety. The goal of this study was to test the tolerability of bacteria on the ocular surface using in vitro and in vivo models...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27487562/phosphorus-removal-performance-and-population-structure-of-phosphorus-accumulating-organisms-in-ha-a-a-mco-sludge-reduction-process
#10
Ning Zuo, Jinchao He, Xiqin Ma, Yongqin Peng, Xia Li
We developed a new sludge reduction HA-A/A-MCO (Hydrolysis-Acidogenosis-Anaerobic/Anoxic -Multistep Continuous Oxic tank) process, which has improved phosphate (P) and nitrogen (N) removal. Its biological treatment unit uses an A(2)/O P & N removal process with hydrolysis acidification, multistep continuous aeration, and continuous flow, coupled with sidestream P removal by draining out anaerobic P-bearing wastewater. The process has advanced synchronization of P and N removal and sludge reduction. The improved performance is closely associated with the population structure of P-accumulating organisms (PAOs)...
September 2, 2016: Bioengineered
https://www.readbyqxmd.com/read/27328268/isolation-of-bdellovibrio-bacteriovorus-from-a-tropical-wastewater-treatment-plant-and-predation-of-mixed-species-biofilms-assembled-by-the-native-community-members
#11
Shugeng Feng, Chuan Hao Tan, Yehuda Cohen, Scott A Rice
It is reported here that a predatory bacterium belonging to the Genus Bdellovibrio, was isolated from activated sludge at the Ulu Pandan Water Reclamation Plant, Singapore. 16S rDNA gene sequencing analysis revealed that this isolate was 99% identical to 'Bdellovibrio bacteriovorus strain Tiberius' and hence is designated as 'Bdellovibrio bacteriovorus UP'. Using a novel approach based on fluorescence in situ hybridization (FISH), a prey cell density-dependent growth pattern of B. bacteriovorus UP was established...
November 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27297185/isolation-of-bdellovibrio-sp-from-soil-samples-in-mexico-and-their-potential-applications-in-control-of-pathogens
#12
Omotayo Opemipo Oyedara, Erick de Jesus De Luna-Santillana, Omar Olguin-Rodriguez, Xianwu Guo, Marco Antonio Mendoza-Villa, Jorge Luis Menchaca-Arredondo, Temidayo Oluyomi Elufisan, Javier Alfonso Garza-Hernandez, Israel Garcia Leon, Mario Alberto Rodriguez-Perez
In this study, two strains of Bdellovibrio were isolated from soil samples using the culture-dependent technique and two members of the family Enterobacteriaceae (Klebsiella sp. and Salmonella sp.) as prey. The Bdellovibrio strains were bacteriolytic, plaque-forming, and highly motile gram-negative bacteria. We identified and confirmed the Bdellovibrio strains using microscopy, PCR amplification, and sequencing of the 16S rRNA gene. They were observed to be different strains based on hit locus and prey range analyses...
June 13, 2016: MicrobiologyOpen
https://www.readbyqxmd.com/read/27262118/autotrophic-nitrogen-assimilation-and-carbon-capture-for-microbial-protein-production-by-a-novel-enrichment-of-hydrogen-oxidizing-bacteria
#13
Silvio Matassa, Willy Verstraete, Ilje Pikaar, Nico Boon
Domestic used water treatment systems are currently predominantly based on conventional resource inefficient treatment processes. While resource recovery is gaining momentum it lacks high value end-products which can be efficiently marketed. Microbial protein production offers a valid and promising alternative by upgrading low value recovered resources into high quality feed and also food. In the present study, we evaluated the potential of hydrogen-oxidizing bacteria to upgrade ammonium and carbon dioxide under autotrophic growth conditions...
September 15, 2016: Water Research
https://www.readbyqxmd.com/read/27211869/interrupting-peptidoglycan-deacetylation-during-bdellovibrio-predator-prey-interaction-prevents-ultimate-destruction-of-prey-wall-liberating-bacterial-ghosts
#14
Carey Lambert, Thomas R Lerner, Nhat Khai Bui, Hannah Somers, Shin-Ichi Aizawa, Susan Liddell, Ana Clark, Waldemar Vollmer, Andrew L Lovering, R Elizabeth Sockett
The peptidoglycan wall, located in the periplasm between the inner and outer membranes of the cell envelope in Gram-negative bacteria, maintains cell shape and endows osmotic robustness. Predatory Bdellovibrio bacteria invade the periplasm of other bacterial prey cells, usually crossing the peptidoglycan layer, forming transient structures called bdelloplasts within which the predators replicate. Prey peptidoglycan remains intact for several hours, but is modified and then degraded by escaping predators. Here we show predation is altered by deleting two Bdellovibrio N-acetylglucosamine (GlcNAc) deacetylases, one of which we show to have a unique two domain structure with a novel regulatory"plug"...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27106259/identification-and-differential-production-of-ubiquinone-8-in-the-bacterial-predator-bdellovibrio-bacteriovorus
#15
Eileen M Spain, Megan E Núñez, Hyeong-Jin Kim, Ryan J Taylor, Nicholas Thomas, Michael B Wengen, Nathan F Dalleska, Joseph P Bromley, Kimberly H Schermerhorn, Megan A Ferguson
Bdellovibrio bacteriovorus 109J, a predatory bacterium with potential as a bacterial control agent, can exist in several lifestyles that differ both in predatory capacity and color. We determined that levels of ubiquinone-8 contribute to the distinctive but variable yellow color of different types of Bdellovibrio cells. Steady-state ubiquinone-8 concentrations did not differ markedly between conventional predatory and host-independent B. bacteriovorus despite upregulation of a suite of ubiquinone-8 synthesis genes in host-independent cells...
June 2016: Research in Microbiology
https://www.readbyqxmd.com/read/27087466/engineering-a-predatory-bacterium-as-a-proficient-killer-agent-for-intracellular-bio-products-recovery-the-case-of-the-polyhydroxyalkanoates
#16
Virginia Martínez, Cristina Herencias, Edouard Jurkevitch, M Auxiliadora Prieto
This work examines the potential of the predatory bacterium Bdellovibrio bacteriovorus HD100, an obligate predator of other Gram-negative bacteria, as an external cell-lytic agent for recovering valuable intracellular bio-products produced by prey cultures. The bio-product targets to be recovered were polyhydroxyalkanoates (PHAs) produced naturally by Pseudomonas putida and Cupriavidus necator, or by recombinant Escherichia coli strains. B. bacteriovorus with a mutated PHA depolymerase gene to prevent the unwanted breakdown of the bio-product allowed the recovery of up to 80% of that accumulated by the prey bacteria, even at high biomass concentrations...
2016: Scientific Reports
https://www.readbyqxmd.com/read/26939460/-diversity-of-bdellovibrio-and-like-organisms-from-shrimp-mariculture-ponds-in-zhanjiang
#17
Chongqing Wen, Ming Xue, Huafang Liang, Shining Zhou
OBJECTIVE: Bdellovibrio-and-like organisms (BALOs) are small-sized, parasitic bacteria that rely on other Gram-negative bacteria for survival. Our work aimed to characterize the community diversity of BALOs associated with tropical shrimp ponds. METHODS: We collected water samples from eight shrimp ponds culturing Litopenaeus vannamei, in Zhanjiang, China, and extracted total DNA of the samples. Then the 16S rRNA gene clone libraries were constructed following PCR amplification with BALOs family-specific primers...
October 4, 2015: Wei Sheng Wu Xue Bao, Acta Microbiologica Sinica
https://www.readbyqxmd.com/read/26929093/stenotrophomonas-maltophilia-biofilm-reduction-by-bdellovibrio-exovorus
#18
Ryan M Chanyi, Susan F Koval, Joanna S Brooke
Stenotrophomonas maltophilia, a bacterium ubiquitous in the environment, is also an opportunistic, multidrug-resistant human pathogen that colonizes tissues and medical devices via biofilm formation. We investigated the ability of an isolate from sewage of the bacterial predator Bdellovibrio exovorus to disrupt preformed biofilms of 18 strains of S. maltophilia isolated from patients, hospital sink drains and water fountain drains. B. exovorus FFRS-5 preyed on all S. maltophilia strains in liquid co-cultures and was able to significantly disrupt the biofilms of 15 of the S...
June 2016: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/26865299/bacterial-predator-prey-dynamics-in-microscale-patchy-landscapes
#19
Felix J H Hol, Or Rotem, Edouard Jurkevitch, Cees Dekker, Daniel A Koster
Soil is a microenvironment with a fragmented (patchy) spatial structure in which many bacterial species interact. Here, we explore the interaction between the predatory bacterium Bdellovibrio bacteriovorus and its prey Escherichia coli in microfabricated landscapes. We ask how fragmentation influences the prey dynamics at the microscale and compare two landscape geometries: a patchy landscape and a continuous landscape. By following the dynamics of prey populations with high spatial and temporal resolution for many generations, we found that the variation in predation rates was twice as large in the patchy landscape and the dynamics was correlated over shorter length scales...
February 10, 2016: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/26792139/erratum-ankyrin-mediated-self-protection-during-cell-invasion-by-the-bacterial-predator-bdellovibrio-bacteriovorus
#20
Carey Lambert, Ian T Cadby, Rob Till, Nhat Khai Bui, Thomas R Lerner, William S Hughes, David J Lee, Luke J Alderwick, Waldemar Vollmer, R Elizabeth Sockett, Andrew L Lovering
No abstract text is available yet for this article.
2016: Nature Communications
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