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https://www.readbyqxmd.com/read/28346467/characterization-and-interstrain-transfer-of-prophage-pp3-of-pseudomonas-aeruginosa
#1
Gang Li, Shuguang Lu, Mengyu Shen, Shuai Le, Wei Shen, Yinling Tan, Jing Wang, Xia Zhao, Yan Zhao, Yali Gong, Yuhui Yang, Hongbin Zhu, Fuquan Hu, Ming Li
Prophages are major contributors to horizontal gene transfer and drive the evolution and diversification of bacteria. Here, we describe the characterization of a prophage element designated pp3 in the clinical Pseudomonas aeruginosa isolate PA1. pp3 spontaneously excises from the PA1 genome and circularizes at a very high frequency of 25%. pp3 is likely to be a defective prophage due to its inability to form plaques on P. aeruginosa indicator strains, and no phage particles could be detected in PA1 supernatants...
2017: PloS One
https://www.readbyqxmd.com/read/28344573/submarine-basaltic-glass-colonization-by-the-heterotrophic-fe-ii-oxidizing-and-siderophore-producing-deep-sea-bacterium-pseudomonas-stutzeri-vs-10-the-potential-role-of-basalt-in-enhancing-growth
#2
Lisa A Sudek, Greg Wanger, Alexis S Templeton, Hubert Staudigel, Bradley M Tebo
Phylogenetically and metabolically diverse bacterial communities have been found in association with submarine basaltic glass surfaces. The driving forces behind basalt colonization are for the most part unknown. It remains ambiguous if basalt provides ecological advantages beyond representing a substrate for surface colonization, such as supplying nutrients and/or energy. Pseudomonas stutzeri VS-10, a metabolically versatile bacterium isolated from Vailulu'u Seamount, was used as a model organism to investigate the physiological responses observed when biofilms are established on basaltic glasses...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28339291/bronchial-microbiome-pa-biofilm-forming-capacity-and-exacerbation-in-severe-copd-patients-colonized-by-p-aerugirona
#3
Marian Garcia-Nuñez, Sara Marti, Carmen Puig, Vicente Perez-Brocal, Laura Millares, Salud Santos, Carmen Ardanuy, Andres Moya, Josefina Liñares, Eduard Monsó
AIM: The bronchial microbiome of severe chronic obstructive pulmonary disease patients colonized by Pseudomonas aeruginosa was analyzed using 16S rRNA gene sequencing to identify differences related to biofilm-forming capacity. PATIENTS & METHODS: Patient sputum samples from 21 patients were studied. RESULTS: Statistically significant differences related to biofilm-forming capacity were only found for genera with relative abundances <1%, and Fusobacterium was over-represented when biofilm-forming capacity was high...
March 24, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28338674/biofilm-formation-enables-free-living-nitrogen-fixing-rhizobacteria-to-fix-nitrogen-under-aerobic-conditions
#4
Di Wang, Anming Xu, Claudine Elmerich, Luyan Z Ma
The multicellular communities of microorganisms known as biofilms are of high significance in agricultural setting, yet it is largely unknown about the biofilm formed by nitrogen-fixing bacteria. Here we report the biofilm formation by Pseudomonas stutzeri A1501, a free-living rhizospheric bacterium, capable of fixing nitrogen under microaerobic and nitrogen-limiting conditions. P. stutzeri A1501 tended to form biofilm in minimal media, especially under nitrogen depletion condition. Under such growth condition, the biofilms formed at the air-liquid interface (termed as pellicles) and the colony biofilms on agar plates exhibited nitrogenase activity in air...
March 24, 2017: ISME Journal
https://www.readbyqxmd.com/read/28337568/hospital-microbial-surface-colonization-revealed-during-monitoring-of-klebsiella-spp-pseudomonas-aeruginosa-and-non-tuberculous-mycobacteria
#5
Pedro Geadas Farias, Fernando Gama, Diogo Reis, Susana Alarico, Nuno Empadinhas, José Carlos Martins, Ana Figueiredo de Almeida, Paula Vasconcelos Morais
Hospital environmental conditions, human occupancy, and the characteristics of the equipment influence the survival of microbial communities and raise a concern with regard to nosocomial infections. The objective of the present work was to use the monitoring of Pseudomonas aeruginosa, Klebsiella spp. and non-tuberculous mycobacteria as a strategy to improve knowledge on microbial colonization of non-critical equipment and surfaces, in a tertiary hospital from Central Portugal. A 3-month microbiological survey was performed in a district teaching hospital...
March 23, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28335605/opportunistic-sampling-of-roadkill-as-an-entry-point-to-accessing-natural-products-assembled-by-bacteria-associated-with-non-anthropoidal-mammalian-microbiomes
#6
Jeremy L Motley, Blake W Stamps, Carter A Mitchell, Alec T Thompson, Jayson Cross, Jianlan You, Douglas R Powell, Bradley S Stevenson, Robert H Cichewicz
Few secondary metabolites have been reported from mammalian microbiome bacteria despite the large numbers of diverse taxa that inhabit warm-blooded higher vertebrates. As a means to investigate natural products from these microorganisms, an opportunistic sampling protocol was developed, which focused on exploring bacteria isolated from roadkill mammals. This initiative was made possible through the establishment of a newly created discovery pipeline, which couples laser ablation electrospray ionization mass spectrometry (LAESIMS) with bioassay testing, to target biologically active metabolites from microbiome-associated bacteria...
March 24, 2017: Journal of Natural Products
https://www.readbyqxmd.com/read/28333234/horizontal-transfer-of-the-blandm-1-gene-to-pseudomonas-aeruginosa-and-acinetobacter-baumannii-in-biofilms
#7
Windy D Tanner, Robyn M Atkinson, Ramesh K Goel, Mark A Toleman, Lowell Scott Benson, Christina A Porucznik, James A VanDerslice
Horizontal gene transfer has contributed to the global spread of the blaNDM-1 gene. Multiple studies have demonstrated plasmid transfer of blaNDM-1 between Gram-negative bacteria, primarily Enterobacteriaceae species, but conjugational transfer of natural blaNDM-1 plasmids from Enterobacteriaceae into Pseudomonas aeruginosa and Acinetobacter baumannii has not previously been shown. As P. aeruginosa and A. baumannii are both typically strong biofilm-formers, transfer of natural blaNDM-1 plasmids could potentially occur more readily in this environment...
February 25, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28330090/piper-betle-leaf-extract-affects-the-quorum-sensing-and-hence-virulence-of-pseudomonas-aeruginosa-pao1
#8
Siraj Datta, Debanjan Jana, Tilak Raj Maity, Aveek Samanta, Rajarshi Banerjee
Quorum sensing (QS) plays an important role in virulence of Pseudomonas aeruginosa, blocking of QS ability are viewed as viable antimicrobial chemotherapy and which may prove to be a safe anti-virulent drug. Bioactive components from Piper betle have been reported to possess antimicrobial ability. This study envisages on the anti-QS properties of ethanolic extract of P. betle leaf (PbLE) using P. aeruginosa PAO1 as a model organism. A marked reduction in swarming, swimming, and twitching ability of the bacteria is demonstrated in presence of PbLE...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28328023/identification-of-microorganisms-in-biofluids-of-individuals-with-periodontitis-and-chronic-kidney-disease-using-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry
#9
Levy Anderson César Alves, Rafael Celestino Souza, Taciana Mara Couto da Silva, Andreia Watanabe, Meriellen Dias, Maria Anita Mendes, Ana Lídia Ciamponi
RATIONALE: Chronic kidney disease (CKD) and periodontitis (PD) are important health issues. There is a large variety of microorganisms related to the pathogenesis of periodontitis, and optimising the time and the cost of laboratory assays to detect these organisms is highly valuable in the medical field. METHODS: Bacteria were isolated from saliva and oral biofilm of 30 adolescents and young adults with definite medical and dental diagnosis of CKD and PD, respectively, and proteins were extracted for microorganism identification by means of the matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) technique...
May 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28323149/the-effect-of-tobramycin-incorporated-with-bismuth-ethanedithiol-loaded-on-niosomes-on-the-quorum-sensing-and-biofilm-formation-of-pseudomonas-aeruginosa
#10
Faeze Mahdiun, Shahla Mansouri, Payam Khazaeli, Rasoul Mirzaei
Pseudomonas aeruginosa is an opportunistic pathogen, enable of causing infections especially in immunocompromised patients. Recently many isolates developed multiple drug resistance, resulting in treatment failure in serious infections. In this study, the effect of tobramycin incorporated with bismuth-ethanedithiol loaded on niosomes on the quorum sensing and biofilm production by P. aeruginosa was evaluated. Thin layer hydration method with cholesterol (30%), Span 40 and Tween 40 were used to make niosomes...
March 18, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28320713/antimicrobial-percutaneous-nephrostomy-catheters-for-the-prevention-of-renal-infections-in-vitro-studies
#11
Nylev Vargas-Cruz, Ruth A Reitzel, Joel Rosenblatt, Mohamed Jamal, Ariel D Szvalb, Anne-Marie Chaftari, Ray Hachem, Issam Raad
Purpose - Percutaneous nephrostomy (PCN) catheters are the primary method for draining ureters obstructed by malignancy and preventing a decline of the renal function. However, PCN-related infections such as pyelonephritis and urosepsis remain a significant concern. Currently no antimicrobial PCNs are available for preventing infectious complications. Vascular catheters impregnated with Minocycline/Rifampin (M/R) and M/R with Chlorhexidine coating (M/R+CHD) have previously demonstrated antimicrobial activity...
March 20, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28319869/biofilm-inhibition-formation-of-clinical-strains-of-pseudomonas-aeruginosa-mutans-photocatalytic-activity-of-azo-dye-and-gc-ms-analysis-of-leaves-of-lagerstroemia-speciosa
#12
V Sai Saraswathi, Neethu Kamarudheen, K V Bhaskara Rao, K Santhakumar
The investigation was conducted to analyse the bioactive compounds from the leaf extracts of L. speciosa by GC-MS. The extracts were screened for antibacterial and antibiofilm activities against potential clinical strains. The bioactive compounds from the leaves of L. speciosa were extracted by soxhlet continuous extraction method and their chemical composition was analysed by Gas Chromatography-Mass Spectroscopy (GC-MS). The antibacterial activity was evaluated against clinical strain like Staphylococcus aureus, Escherichia coli, P...
March 9, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28316045/nitrogen-removal-and-microbial-community-shift-in-an-aerobic-denitrification-reactor-bioaugmented-with-a-pseudomonas-strain-for-coal-based-ethylene-glycol-industry-wastewater-treatment
#13
Cong Du, Chong-Wei Cui, Shan Qiu, Sheng-Nan Shi, Ang Li, Fang Ma
An aerobic denitrification system, initially bioaugmented with Pseudomonas strain T13, was established to treat coal-based ethylene glycol industry wastewater, which contained 3219 ± 86 mg/L total nitrogen (TN) and 1978 ± 14 mg/L NO3(-)-N. In the current study, a stable denitrification efficiency of 53.7 ± 4.7% and nitrite removal efficiency of 40.1 ± 2.7% were achieved at different diluted influent concentrations. Toxicity evaluation showed that a lower toxicity of effluent was achieved when industry wastewater was treated by stuffing biofilm communities compared to suspended communities...
March 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28303823/bacterial-and-fungal-biofilm-formation-on-contact-lenses-and-their-susceptibility-to-lens-care-solutions
#14
Siddharth Kackar, Ethel Suman, M Shashidhar Kotian
BACKGROUND: Microbial biofilm formation on contact lenses and lens storage cases may be a risk factor for contact lens-associated corneal infections. Various types of contact lens care solutions are used to reduce microbial growths on lenses. OBJECTIVES: The present study aimed at comparing the growths of biofilms on the different contact lenses and lens cases. The study also aimed at determining the effect of lens care solutions and bacteriophage on these biofilms...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28302780/draft-genome-sequence-of-pseudomonas-sp-bdal1-reconstructed-from-a-bakken-shale-hydraulic-fracturing-produced-water-storage-tank-metagenome
#15
Daniel Lipus, Daniel Ross, Kyle Bibby, Djuna Gulliver
We report the 5,425,832 bp draft genome of Pseudomonas sp. strain BDAL1, recovered from a Bakken shale hydraulic fracturing-produced water tank metagenome. Genome annotation revealed several key biofilm formation genes and osmotic stress response mechanisms necessary for survival in hydraulic fracturing-produced water.
March 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28301918/pseudomonas-aeruginosa-biofilm-a-programmed-bacterial-life-for-fitness
#16
REVIEW
Keehoon Lee, Sang Sun Yoon
Biofilm is a community of microbes that typically inhabits on surfaces and is encased in an extracellular matrix. Biofilms display very dissimilar characteristics to their planktonic counterparts. Biofilms are ubiquitous in the environments and influence our life tremendously in both positive and negative ways. Pseudomonas aeruginosa is a bacterium, known to produce robust biofilms. P. aeruginosa biofilms cause severe problems in immunocompromised patients including those with cystic fibrosis or wound infection...
March 17, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28301571/modulation-of-behaviour-and-virulence-of-a-high-alginate-expressing-pseudomonas-aeruginosa-strain-from-cystic-fibrosis-by-oral-commensal-bacterium-streptococcus-anginosus
#17
Richard D Waite, Muhammad R Qureshi, Robert A Whiley
Cystic fibrosis (CF) airways harbour complex and dynamic polymicrobial communities that include many oral bacteria. Despite increased knowledge of CF airway microbiomes the interaction between established CF pathogens and other resident microbes and resulting impact on disease progression is poorly understood. Previous studies have demonstrated that oral commensal streptococci of the Anginosus group (AGS) can establish chronic pulmonary infections and become numerically dominant in CF sputa indicating that they play an important role in CF microbiome dynamics...
2017: PloS One
https://www.readbyqxmd.com/read/28299769/the-effect-of-urinary-catheters-on-microbial-biofilms-and-catheter-associated-urinary-tract-infections
#18
Sahra Kirmusaoglu, Seyhun Yurdugül, Ahmet Metin, Suphi Vehid
PURPOSE: The aims of this study were to determine relationship between biofilm producer microorganisms attached to urinary catheters (UCs) and urinary catheter-associated urinary tract infections (CAUTIs), to determine the rate of CAUTI development and the relationship between CAUTI and catheterization period in catheterized patients. MATERIALS AND METHODS: Urinary catheters from 143 inpatients who were hospitalized in Abant Izzet Baysal University Hospital Urinary Service, and urine samples of these patients before and after catheterization of urinarycatheter were collected...
March 16, 2017: Urology Journal
https://www.readbyqxmd.com/read/28299749/osmotic-stress-in-colony-and-planktonic-cells-of-pseudomonas-putida-mt-2-revealed-significant-differences-in-adaptive-response-mechanisms
#19
Nancy Hachicho, Astrid Birnbaum, Hermann J Heipieper
Planktonic cells and those grown on surfaces (or as colony biofilm) are known to show significant differences regarding growth behavior, cell physiology, gene expression and stress tolerance. In order to compare stress behavior of different growth forms, shake cultures for planktonic growth and agar plate cultivation for colony growth, were carried out with the well investigated model organism, Pseudomonas putida mt-2. Cells were exposed to sodium chloride to cause osmotic stress as one main environmental stressor bacteria have to cope with when growing in soil...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28296935/peptide-modification-results-in-the-formation-of-a-dimer-with-a-60-fold-enhanced-antimicrobial-activity
#20
Amal Thamri, Myriam Létourneau, Alex Djoboulian, David Chatenet, Eric Déziel, Annie Castonguay, Jonathan Perreault
Cationic antimicrobial peptides (CAMPs) occur naturally in numerous organisms and are considered as a class of antibiotics with promising potential against multi-resistant bacteria. Herein, we report a strategy that can lead to the discovery of novel small CAMPs with greatly enhanced antimicrobial activity and retained antibiofilm potential. We geared our efforts towards i) the N-terminal cysteine functionalization of a previously reported small synthetic cationic peptide (peptide 1037, KRFRIRVRV-NH2), ii) its dimerization through a disulfide bond, and iii) a preliminary antimicrobial activity assessment of the newly prepared dimer against Pseudomonas aeruginosa and Burkholderia cenocepacia, pathogens responsible for the formation of biofilms in lungs of individuals with cystic fibrosis...
2017: PloS One
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