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[PMID]: 28492178 [Au] Autor: Kongrueng J; Mitraparp-Arthorn P; Bangpanwimon K; Robins W; Vuddhakul V; Mekalanos J [Ad] Endereço: Food Safety and Health Research Unit, Department of Microbiology, Faculty of Science, Prince of Songkla University, Hat Yai, Thailand. [Ti] Título: Isolation of Bdellovibrio and like organisms and potential to reduce acute hepatopancreatic necrosis disease caused by Vibrio parahaemolyticus. [So] Source: Dis Aquat Organ;124(3):223-232, 2017 05 11. [Is] ISSN: 0177-5103 [Cp] País de publicação: Germany [La] Idioma: eng [Ab] Resumo: Acute hepatopancreatic necrosis disease, a severe disease of shrimp, is caused by Vibrio parahaemolyticus (AHPND Vp), a halophilic bacterium harboring a plasmid that contains toxin genes homologous to Photorhabdus insect-related toxins. We obtained 9 isolates of Bdellovibrio and like organisms (BALOs) from water and sediment samples in Thailand. Using 16S rRNA sequencing, all of the organisms were identified as Bacteriovorax spp. and were able to attack all tested AHPND Vp isolates. In addition, their various susceptible hosts, including Gram-positive and Gram-negative bacteria, were observed. The optimal ratio for interaction between the Bacteriovorax isolate BV-A and AHPND Vp was determined to be 1:10. The suitable conditions applied for co-culture between BV-A and AHPND Vp were 30°C, 2% NaCl, and pH 7.6. The capability of BV-A to reduce numbers of AHPND Vp in vitro was observed in co-culture after incubation for 2 d and continued until the end of the incubation period. In vivo, BV-A was able to reduce mortality of shrimp post-larvae infected with AHPND Vp. In addition, BV-A significantly decreased the formation of biofilm by AHPND Vp. These findings provide evidence for using Bacteriovorax as a biocontrol of AHPND Vp in shrimp aquaculture. [Mh] Termos MeSH primário: Bdellovibrio/classificação Bdellovibrio/fisiologia Penaeidae/microbiologia Vibrio parahaemolyticus/patogenicidade [Mh] Termos MeSH secundário: Animais Bdellovibrio/genética Biofilmes Interações Hospedeiro-Patógeno Filogenia RNA Bacteriano/genética RNA Ribossômico 16S/genética [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (RNA, Bacterial); 0 (RNA, Ribosomal, 16S) [Em] Mês de entrada: 1708 [Cu] Atualização por classe: 170803 [Lr] Data última revisão: 170803 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170512 [St] Status: MEDLINE [do] DOI: 10.3354/dao03120

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[PMID]: 28334102 [Au] Autor: Feng S; Tan CH; Constancias F; Kohli GS; Cohen Y; Rice SA [Ad] Endereço: The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore. [Ti] Título: Predation by Bdellovibrio bacteriovorus significantly reduces viability and alters the microbial community composition of activated sludge flocs and granules. [So] Source: FEMS Microbiol Ecol;93(4), 2017 Apr 01. [Is] ISSN: 1574-6941 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: We recently isolated and characterised a predatory Bdellovibrio bacteriovorus strain from activated sludge (Ulu Pandan Water Reclamation Plant, Singapore), and this strain, B. bacteriovorus UP, was able to prey upon a broad spectrum of bacterial isolates from the activated sludge when grown as planktonic cells or as biofilms. Here, we have tested the effect of Bdellovibrio predation on floccular and granular sludge to determine if the spatial organisation, loosely or tightly aggregated communities, was protective from predation. The effect of predation was assessed using a combination of biomass quantification, cellular activity measurement and microscopic image analysis to determine community viability. Additionally, changes in the microbial communities due to predation by B. bacteriovorus UP were analysed through total RNA sequencing. Predation led to a significant reduction in microbial activity and total biomass for both floccular and granular sludge communities. Predation was also associated with significant changes in the microbial community composition in both communities, with >90% of the community members reduced in relative abundance after 24 h. Of those community members, the dominant organisms, such as Proteobacteria and Bacteroidetes, were the most affected phylotypes. This suggests that predatory bacteria, which display indiscriminant feeding, could significantly shift the species composition and thus, may disturb the operational performance of wastewater treatment systems. [Mh] Termos MeSH primário: Bdellovibrio bacteriovorus/fisiologia Esgotos/microbiologia [Mh] Termos MeSH secundário: Bactérias Bdellovibrio/genética Biofilmes Singapura Eliminação de Resíduos Líquidos [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Sewage) [Em] Mês de entrada: 1706 [Cu] Atualização por classe: 170620 [Lr] Data última revisão: 170620 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 170324 [St] Status: MEDLINE [do] DOI: 10.1093/femsec/fix020

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[PMID]: 27915281 [Au] Autor: Otto S; Harms H; Wick LY [Ad] Endereço: UFZ-Helmholtz Centre for Environmental Research, Department of Environmental Microbiology, Permoserstr. 15, 04318 Leipzig, Germany. [Ti] Título: Effects of predation and dispersal on bacterial abundance and contaminant biodegradation. [So] Source: FEMS Microbiol Ecol;93(2), 2017 Feb. [Is] ISSN: 1574-6941 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: 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 LP6a) 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. Different predator-to-prey ratios and spatial arrangements of prey and predator inoculation were used to study predation pressure effects on PHE degradation. We observed that predation resulted in (i) enhanced PHE-degradation at low predator counts (PC) compared to controls lacking predation, (ii) reduced PHE-degradation at elevated PC relative to low PC, and (iii) significant effects of the spatial arrangement of prey and predator inoculation on PHE degradation. Our data suggest that predation facilitated by dispersal networks (such as fungal mycelia) may support the build-up of an effective bacterial biomass and, hence, contaminant biodegradation in heterogeneous systems such as soil. [Mh] Termos MeSH primário: Biodegradação Ambiental Pseudomonas fluorescens/fisiologia Poluentes do Solo/metabolismo [Mh] Termos MeSH secundário: Bdellovibrio/crescimento & desenvolvimento Bdellovibrio/fisiologia Biomassa Cadeia Alimentar Pseudomonas fluorescens/metabolismo Poluentes do Solo/análise [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Soil Pollutants) [Em] Mês de entrada: 1707 [Cu] Atualização por classe: 170726 [Lr] Data última revisão: 170726 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161205 [St] Status: MEDLINE

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[PMID]: 27825775 [Au] Autor: Li N; Wang K; Williams HN; Sun J; Ding C; Leng X; Dong K [Ad] Endereço: College of Marine Science and Environmental Sciences, Tianjin University of Science and Technology, Tianjin 300457, China; School of the Environment, Florida A&M University, Tallahassee, FL, USA. Electronic address: nan.li@famu.edu. [Ti] Título: Analysis of gene gain and loss in the evolution of predatory bacteria. [So] Source: Gene;598:63-70, 2017 Jan 20. [Is] ISSN: 1879-0038 [Cp] País de publicação: Netherlands [La] Idioma: eng [Ab] Resumo: 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. In total, 1977 gene families were classified. Of these 509 (pattern 11111111111) were present all of the 11 species. Among the non-core set gene families, 52 were present only in saltwater bacteria predators and had no ortholog in the other genomes. Similarly 109 and 44 were present only in the genomes of Micavibrio spp. and Bdellovibrio spp., respectively. In this study, the gain loss mapping engine GLOOME was selected to analyze and estimate the expectations and probabilities of both gain and loss events in the predatory bacteria. In total, 354 gene families were involved in significant gene gain events, and 407 gene families were classified into gene loss events with high supported value. Moreover, 18 families from the core set gene family were identified as putative genes under positive selection. The results of this study suggest that acquisition of particular genes that encode functional proteins in metabolism and cellular processes and signaling, especially ABC systems, may help bacterial predators adapt to surrounding environmental changes and present different predation strategies for survival in their habitats. [Mh] Termos MeSH primário: Bactérias/genética Bactérias/patogenicidade Evolução Molecular Genes Bacterianos [Mh] Termos MeSH secundário: Alphaproteobacteria/classificação Alphaproteobacteria/genética Alphaproteobacteria/patogenicidade Animais Bactérias/classificação Bacteroidetes/classificação Bacteroidetes/genética Bacteroidetes/patogenicidade Bdellovibrio/classificação Bdellovibrio/genética Bdellovibrio/patogenicidade Mapeamento Cromossômico Deltaproteobacteria/classificação Deltaproteobacteria/genética Deltaproteobacteria/patogenicidade Ecossistema Seres Humanos Família Multigênica Filogenia Virulência/genética [Pt] Tipo de publicação: JOURNAL ARTICLE [Em] Mês de entrada: 1702 [Cu] Atualização por classe: 170201 [Lr] Data última revisão: 170201 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161110 [St] Status: MEDLINE

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[PMID]: 27834203 [Au] Autor: Shatzkes K; Singleton E; Tang C; Zuena M; Shukla S; Gupta S; Dharani S; Onyile O; Rinaggio J; Connell ND; Kadouri DE [Ad] Endereço: Division of Infectious Disease, Department of Medicine, Rutgers New Jersey Medical School, Newark, New Jersey, USA. [Ti] Título: Predatory Bacteria Attenuate Klebsiella pneumoniae Burden in Rat Lungs. [So] Source: MBio;7(6), 2016 Nov 08. [Is] ISSN: 2150-7511 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: 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. Initial safety studies were performed by intranasal inoculation of rats with predatory bacteria. No adverse effects or lung pathology were observed in rats exposed to high concentrations of predatory bacteria at up to 10 days postinoculation. Enzyme-linked immunosorbent assay (ELISA) of the immune response revealed a slight increase in inflammatory cytokine levels at 1 h postinoculation that was not sustained by 48 h. Additionally, dissemination experiments showed that predators were efficiently cleared from the host by 10 days postinoculation. To measure the ability of predatory bacteria to reduce microbial burden in vivo, we introduced sublethal concentrations of Klebsiella pneumoniae into the lungs of rats via intranasal inoculation and followed with multiple doses of predatory bacteria over 24 h. Predatory bacteria were able to reduce K. pneumoniae bacterial burden, on average, by more than 3.0 log in the lungs of most rats as measured by CFU plating. The work presented here provides further support for the idea of developing predatory bacteria as a novel biocontrol agent. IMPORTANCE: A widely held notion is that antibiotics are the greatest medical advance of the last 50 years. However, the rise of multidrug-resistant (MDR) bacterial infections has become a global health crisis over the last decade. As we enter the postantibiotic era, it is crucial that we begin to develop new strategies to combat bacterial infection. Here, we report one such new approach: the use of predatory bacteria (Bdellovibrio bacteriovorus and Micavibrio aeruginosavorus) that naturally-and obligately-prey on other Gram-negative bacteria. To our knowledge, this is the first study that demonstrated the ability of predatory bacteria to attenuate the bacterial burden of a key human pathogen in an in vivo mammalian system. As the prevalence of MDR infections continues to rise each year, our results may represent a shift in how we approach treating microbial infections in the future. [Mh] Termos MeSH primário: Antibiose Bdellovibrio/fisiologia Infecções por Klebsiella/microbiologia Infecções por Klebsiella/terapia Klebsiella pneumoniae/fisiologia Pulmão/microbiologia [Mh] Termos MeSH secundário: Animais Carga Bacteriana Citocinas/biossíntese Citocinas/imunologia Ensaio de Imunoadsorção Enzimática Seres Humanos Pulmão/patologia Ratos [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Cytokines) [Em] Mês de entrada: 1707 [Cu] Atualização por classe: 170721 [Lr] Data última revisão: 170721 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 161112 [St] Status: MEDLINE

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[PMID]: 27487562 [Au] Autor: Zuo N; He J; Ma X; Peng Y; Li X [Ad] Endereço: a Southwest Research Institution for Water Transport Engineering, Chongqing Jiaotong University , Chongqing , China. [Ti] Título: Phosphorus removal performance and population structure of phosphorus-accumulating organisms in HA-A/A-MCO sludge reduction process. [So] Source: Bioengineered;7(5):327-333, 2016 Sep 02. [Is] ISSN: 2165-5987 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: 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 /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). This study investigated the relationship between P removal performance and the population structure of PAOs. The results show that the average effluent P content of HA-A/A-MCO process was only 0.44 mg/L, when the influent P concentration was 8∼12 mg/L. The effluent met the A standard set by GB18918-2002. PAOs were able to effectively release 1 mg of P and absorb 2.8 mg of P. The system removed P by draining out anaerobic P-rich wastewater, as P had been reduced in the aerobic absorption process. This reduced the need for excess P uptake ability of the PAOs. The bacterial pure culture method was applied to isolate 5 PAOs with typical P absorption and removel features. 16SrDNA amplification and sequence analysis revealed that Acinetobacter sp. and Lampropedia sp played dominant roles in anaerobic P-releasing process. Moreover, Devosia sp. and Bdellovibrio sp were the primary strains in the aerobic tank, and, they were the major stains for P absorption. Uncultured Bacterium and other uncultured strains were detected in the anoxic tank. [Mh] Termos MeSH primário: Bactérias/metabolismo Reatores Biológicos/microbiologia Fósforo/isolamento & purificação Esgotos/química [Mh] Termos MeSH secundário: Acinetobacter/metabolismo Aerobiose Anaerobiose Bactérias/isolamento & purificação Bdellovibrio/metabolismo DNA Bacteriano/genética Desenho de Equipamento Nitrogênio/metabolismo Fosfatos/metabolismo RNA Ribossômico 16S/genética Análise de Sequência de DNA [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (DNA, Bacterial); 0 (Phosphates); 0 (RNA, Ribosomal, 16S); 0 (Sewage); 27YLU75U4W (Phosphorus); N762921K75 (Nitrogen) [Em] Mês de entrada: 1703 [Cu] Atualização por classe: 170817 [Lr] Data última revisão: 170817 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 160804 [St] Status: MEDLINE

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[PMID]: 27297185 [Au] Autor: Oyedara OO; De Luna-Santillana EJ; Olguin-Rodriguez O; Guo X; Mendoza-Villa MA; Menchaca-Arredondo JL; Elufisan TO; Garza-Hernandez JA; Garcia Leon I; Rodriguez-Perez MA [Ad] Endereço: Instituto Politécnico Nacional, Centro de Biotecnología Genómica, Reynosa, Tamaulipas, 88710, México. [Ti] Título: Isolation of Bdellovibrio sp. from soil samples in Mexico and their potential applications in control of pathogens. [So] Source: Microbiologyopen;5(6):992-1002, 2016 Dec. [Is] ISSN: 2045-8827 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: 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. Here, the first report on Bdellovibrio strains isolated from soil in Mexico corroborates earlier report indicating that populations of Bdellovibrio found in soil are heterogeneous thereby the need to identify the various strains. [Mh] Termos MeSH primário: Bacteriólise/fisiologia Bdellovibrio/isolamento & purificação Agentes de Controle Biológico/metabolismo Klebsiella/crescimento & desenvolvimento Salmonella/crescimento & desenvolvimento [Mh] Termos MeSH secundário: Sequência de Bases Bdellovibrio/classificação Bdellovibrio/genética DNA Bacteriano/genética México Microscopia de Força Atômica Reação em Cadeia da Polimerase RNA Ribossômico 16S/genética Análise de Sequência de DNA Microbiologia do Solo [Pt] Tipo de publicação: JOURNAL ARTICLE [Nm] Nome de substância: 0 (Biological Control Agents); 0 (DNA, Bacterial); 0 (RNA, Ribosomal, 16S) [Em] Mês de entrada: 1706 [Cu] Atualização por classe: 170626 [Lr] Data última revisão: 170626 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 160615 [St] Status: MEDLINE [do] DOI: 10.1002/mbo3.382

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[PMID]: 26929093 [Au] Autor: Chanyi RM; Koval SF; Brooke JS [Ad] Endereço: Department of Microbiology and Immunology, University of Western Ontario, London, ON, Canada. [Ti] Título: Stenotrophomonas maltophilia biofilm reduction by Bdellovibrio exovorus. [So] Source: Environ Microbiol Rep;8(3):343-51, 2016 06. [Is] ISSN: 1758-2229 [Cp] País de publicação: United States [La] Idioma: eng [Ab] Resumo: 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. maltophilia strains tested, decreasing as much as 76.7% of the biofilm mass. The addition of ciprofloxacin and kanamycin in general reduced S. maltophilia biofilms but less than that of B. exovorus alone. Furthermore, when antibiotics and B. exovorus were used together, B. exovorus was still effective in the presence of ciprofloxacin whereas the addition of kanamycin reduced the effectiveness of B. exovorus. Overall, B. exovorus was able to decrease the mass of preformed biofilms of S. maltophilia in the presence of clinically relevant antibiotics demonstrating that the predator may prove to be a beneficial tool to reduce S. maltophilia environmental or clinically associated biofilms. [Mh] Termos MeSH primário: Antibiose Bdellovibrio/crescimento & desenvolvimento Biofilmes/crescimento & desenvolvimento Stenotrophomonas maltophilia/fisiologia [Mh] Termos MeSH secundário: Antibacterianos/farmacologia Bdellovibrio/isolamento & purificação Ciprofloxacino/farmacologia Microbiologia Ambiental Infecções por Bactérias Gram-Negativas/microbiologia Seres Humanos Canamicina/farmacologia Esgotos/microbiologia Stenotrophomonas maltophilia/efeitos dos fármacos Stenotrophomonas maltophilia/crescimento & desenvolvimento Stenotrophomonas maltophilia/isolamento & purificação [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Nm] Nome de substância: 0 (Anti-Bacterial Agents); 0 (Sewage); 59-01-8 (Kanamycin); 5E8K9I0O4U (Ciprofloxacin) [Em] Mês de entrada: 1708 [Cu] Atualização por classe: 171126 [Lr] Data última revisão: 171126 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 160302 [St] Status: MEDLINE [do] DOI: 10.1111/1758-2229.12384

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[PMID]: 26865299 [Au] Autor: Hol FJ; Rotem O; Jurkevitch E; Dekker C; Koster DA [Ad] Endereço: Department of Bionanoscience, Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands. [Ti] Título: Bacterial predator-prey dynamics in microscale patchy landscapes. [So] Source: Proc Biol Sci;283(1824), 2016 Feb 10. [Is] ISSN: 1471-2954 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: 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. We also found that while the prey population in the continuous landscape was almost entirely driven to extinction, a significant part of the prey population in the fragmented landscape persisted over time. We observed significant surface-associated growth, especially in the fragmented landscape and we surmise that this sub-population is more resistant to predation. Our results thus show that microscale fragmentation can significantly influence bacterial interactions. [Mh] Termos MeSH primário: Bdellovibrio/fisiologia Escherichia coli/fisiologia Cadeia Alimentar [Mh] Termos MeSH secundário: Meio Ambiente [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T [Em] Mês de entrada: 1701 [Cu] Atualização por classe: 170922 [Lr] Data última revisão: 170922 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 160212 [St] Status: MEDLINE

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[PMID]: 26251870 [Au] Autor: Williams HN; Lymperopoulou DS; Athar R; Chauhan A; Dickerson TL; Chen H; Laws E; Berhane TK; Flowers AR; Bradley N; Young S; Blackwood D; Murray J; Mustapha O; Blackwell C; Tung Y; Noble RT [Ad] Endereço: School of the Environment, Florida Agricultural and Mechanical University, Tallahassee, FL, USA. [Ti] Título: Halobacteriovorax, an underestimated predator on bacteria: potential impact relative to viruses on bacterial mortality. [So] Source: ISME J;10(2):491-9, 2016 Feb. [Is] ISSN: 1751-7370 [Cp] País de publicação: England [La] Idioma: eng [Ab] Resumo: Predation on bacteria and accompanying mortality are important mechanisms in controlling bacterial populations and recycling of nutrients through the microbial loop. The agents most investigated and seen as responsible for bacterial mortality are viruses and protists. However, a body of evidence suggests that predatory bacteria such as the Halobacteriovorax (formerly Bacteriovorax), a Bdellovibrio-like organism, contribute substantially to bacterial death. Until now, conclusive evidence has been lacking. The goal of this study was to better understand the contributors to bacterial mortality by addressing the poorly understood role of Halobacteriovorax and how their role compares with that of viruses. The results revealed that when a concentrated suspension of Vibrio parahaemolyticus was added into microcosms of estuarine waters, the native Halobacteriovorax were the predators that responded first and most rapidly. Their numbers increased by four orders of magnitude, whereas V. parahaemolyticus prey numbers decreased by three orders of magnitude. In contrast, the extant virus population showed little increase and produced little change in the prey density. An independent experiment with stable isotope probing confirmed that Halobacteriovorax were the predators primarily responsible for the mortality of the V. parahaemolyticus. The results show that Halobacteriovorax have the potential to be significant contributors to bacterial mortality, and in such cases, predation by Halobacteriovorax may be an important mechanism of nutrient recycling. These conclusions add another dimension to bacterial mortality and the recycling of nutrients. [Mh] Termos MeSH primário: Antibiose Bdellovibrio/fisiologia Vibrio parahaemolyticus/crescimento & desenvolvimento Fenômenos Fisiológicos Virais [Mh] Termos MeSH secundário: Vibrio parahaemolyticus/fisiologia Vírus/crescimento & desenvolvimento [Pt] Tipo de publicação: JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S. [Em] Mês de entrada: 1610 [Cu] Atualização por classe: 170220 [Lr] Data última revisão: 170220 [Sb] Subgrupo de revista: IM [Da] Data de entrada para processamento: 150808 [St] Status: MEDLINE [do] DOI: 10.1038/ismej.2015.129

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