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https://www.readbyqxmd.com/read/28229593/development-of-laser-structured-liquid-infused-titanium-with-strong-biofilm-repellent-properties
#1
Katharina Doll, Elena Fadeeva, Joern Schaeske, Tobias Ehmke, Andreas Winkel, Alexander Heisterkamp, Boris N Chichkov, Meike Stiesch, Nico S Stumpp
Medical implants are commonly used in modern medicine but still harbor the risk of microbial infections caused by bacterial biofilms. As their retrospective treatment is difficult, there is a need for biomedical materials, which inhibit bacterial colonization from the start without using antibacterial agents, as these can promote resistance development. The promising concept of slippery liquid-infused porous surfaces (SLIPS) possesses enormous potential for this purpose. In the present study, this principle was applied to titanium, a common material in implantology, and its biofilm-repellent properties were demonstrated...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28221885/antibacterial-and-antiadhesive-activities-of-extracts-from-edible-plants-against-soft-drink-spoilage-by-asaia-spp
#2
Hubert Antolak, Agata Czyzowska, Dorota Kregiel
This study was conducted to investigate the antibacterial and antiadhesive activities of ethanol extracts from five edible plant parts: cinnamon bark ( Cinnamomum zeylanicum ), licorice root ( Glycyrrhiza radix ), nettle leaves ( Urtica dioica ), green tea leaves ( Camellia sinensis ), and elderberry flowers ( Sambucus nigra ). The chemical constituents of the extracts were identified using high-performance liquid chromatography and liquid chromatography plus mass spectrometry. Six strains of Asaia lannensis and Asaia bogorensis bacteria isolated from spoiled commercial fruit-flavored noncarbonated mineral water were used...
January 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28207869/impact-of-wall-shear-stress-on-initial-bacterial-adhesion-in-rotating-annular-reactor
#3
Thibaut Saur, Emilie Morin, Frédéric Habouzit, Nicolas Bernet, Renaud Escudié
The objective of this study was to investigate the bacterial adhesion under different wall shear stresses in turbulent flow and using a diverse bacterial consortium. A better understanding of the mechanisms governing microbial adhesion can be useful in diverse domains such as industrial processes, medical fields or environmental biotechnologies. The impact of wall shear stress-four values ranging from 0.09 to 7.3 Pa on polypropylene (PP) and polyvinyl chloride (PVC)-was carried out in rotating annular reactors to evaluate the adhesion in terms of morphological and microbiological structures...
2017: PloS One
https://www.readbyqxmd.com/read/28193634/purified-streptococcus-pneumoniae-endopeptidase-o-pepo-enhances-particle-uptake-by-macrophages-in-a-tlr2-and-mir-155-dependent-manner
#4
Hua Yao, Hong Zhang, Kai Lan, Hong Wang, Yufeng Su, Dagen Li, Zhixin Song, Fang Cui, Yibing Yin, Xuemei Zhang
Insights into the host-microbial virulence factors interaction, especially the immune-signaling mechanisms, could provide novel prevention and treatment options for pneumococcal diseases. Streptococcus pneumoniae endopeptidase O (PepO) is a newly discovered and ubiquitously expressed pneumococcal virulence protein. A PepO-mutant strain showed impaired adherence to and invasion of host cells compared with their isogenic wild-type strains. It is still unknown whether PepO is involved in host defense response against pneumococcal infection...
February 13, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28179509/iga-coated-e-coli-enriched-in-crohn-s-disease-spondyloarthritis-promote-th17-dependent-inflammation
#5
Monica Viladomiu, Charles Kivolowitz, Ahmed Abdulhamid, Belgin Dogan, Daniel Victorio, Jim G Castellanos, Viola Woo, Fei Teng, Nhan L Tran, Andrew Sczesnak, Christina Chai, Myunghoo Kim, Gretchen E Diehl, Nadim J Ajami, Joseph F Petrosino, Xi K Zhou, Sergio Schwartzman, Lisa A Mandl, Meira Abramowitz, Vinita Jacob, Brian Bosworth, Adam Steinlauf, Ellen J Scherl, Hsin-Jung Joyce Wu, Kenneth W Simpson, Randy S Longman
Peripheral spondyloarthritis (SpA) is a common extraintestinal manifestation in patients with active inflammatory bowel disease (IBD) characterized by inflammatory enthesitis, dactylitis, or synovitis of nonaxial joints. However, a mechanistic understanding of the link between intestinal inflammation and SpA has yet to emerge. We evaluated and functionally characterized the fecal microbiome of IBD patients with or without peripheral SpA. Coupling the sorting of immunoglobulin A (IgA)-coated microbiota with 16S ribosomal RNA-based analysis (IgA-seq) revealed a selective enrichment in IgA-coated Escherichia coli in patients with Crohn's disease-associated SpA (CD-SpA) compared to CD alone...
February 8, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28178315/composition-and-pathogenic-potential-of-a-microbial-bioremediation-product-used-for-crude-oil-degradation
#6
Azam F Tayabali, Gordon Coleman, Jennifer Crosthwait, Kathy C Nguyen, Yan Zhang, Philip Shwed
A microbial bioremediation product (MBP) used for large-scale oil degradation was investigated for microbial constituents and possible pathogenicity. Aerobic growth on various media yielded >108 colonies mL-1. Full-length 16S rDNA sequencing and fatty acid profiling from morphologically distinct colonies revealed ≥13 distinct genera. Full-length 16S rDNA library sequencing, by either Sanger or long-read PacBio technology, suggested that up to 21% of the MBP was composed of Arcobacter. Other high abundance microbial constituents (>6%) included the genera Proteus, Enterococcus, Dysgonomonas and several genera in the order Bacteroidales...
2017: PloS One
https://www.readbyqxmd.com/read/28143978/the-type-iva-pilus-machinery-is-recruited-to-sites-of-future-cell-division
#7
Tyson Carter, Ryan N C Buensuceso, Stephanie Tammam, Ryan P Lamers, Hanjeong Harvey, P Lynne Howell, Lori L Burrows
: Type IVa pili (T4aP) are ubiquitous microbial appendages used for adherence, twitching motility, DNA uptake, and electron transfer. Many of these functions depend on dynamic assembly and disassembly of the pilus by a megadalton-sized, cell envelope-spanning protein complex located at the poles of rod-shaped bacteria. How the T4aP assembly complex becomes integrated into the cell envelope in the absence of dedicated peptidoglycan (PG) hydrolases is unknown. After ruling out the potential involvement of housekeeping PG hydrolases in the installation of the T4aP machinery in Pseudomonas aeruginosa, we discovered that key components of inner (PilMNOP) and outer (PilQ) membrane subcomplexes are recruited to future sites of cell division...
January 31, 2017: MBio
https://www.readbyqxmd.com/read/28112955/fate-of-eight-different-polymers-under-uncontrolled-composting-conditions-relationships-between-deterioration-biofilm-formation-and-the-material-surface-properties
#8
Anne Mercier, Kevin Gravouil, Willy Aucher, Sandra Brosset-Vincent, Linette Kadri, Jenny Colas, Didier Bouchon, Thierry Ferreira
With the ever-increasing volume of polymer wastes and their associated detrimental impacts on the environment, the plastic life cycle has drawn increasing attention. Here, eight commercial polymers selected from biodegradable to environmentally persistent materials, all formulated under a credit card format, were incubated in an outdoor compost to evaluate their fate over time and to profile the microbial communities colonizing their surfaces. After 450 days in compost, the samples were all colonized by multispecies biofilms, these latest displaying different amounts of adhered microbial biomass and significantly distinct bacterial and fungal community compositions depending on the substrate...
February 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28097056/rhea-a-transparent-and-modular-r-pipeline-for-microbial-profiling-based-on-16s-rrna-gene-amplicons
#9
Ilias Lagkouvardos, Sandra Fischer, Neeraj Kumar, Thomas Clavel
The importance of 16S rRNA gene amplicon profiles for understanding the influence of microbes in a variety of environments coupled with the steep reduction in sequencing costs led to a surge of microbial sequencing projects. The expanding crowd of scientists and clinicians wanting to make use of sequencing datasets can choose among a range of multipurpose software platforms, the use of which can be intimidating for non-expert users. Among available pipeline options for high-throughput 16S rRNA gene analysis, the R programming language and software environment for statistical computing stands out for its power and increased flexibility, and the possibility to adhere to most recent best practices and to adjust to individual project needs...
2017: PeerJ
https://www.readbyqxmd.com/read/28076690/effect-of-intermittent-aeration-strategies-on-treatment-performance-and-microbial-community-of-an-ifas-reactor-treating-municipal-waste-water
#10
Nitin Kumar Singh, Akansha Bhatia, Absar Ahmad Kazmi
This study investigated the effect of various intermittent aeration (IA) cycles on organics and nutrient removal, and microbial communities in an integrated fixed-film activated sludge (IFAS) reactor treating municipal waste water. Average effluent biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids, total nitrogen (TN) and total phosphorus (TP) values were noted as 20, 50, 30, 12 and 1.5 mgL(-1), respectively, in continuous aeration mode. A total of four operational conditions (run 1, continuous aeration; run 2, 150/30 min aeration on/off time; run 3, 120/60 min aeration on/off time and run 4, 90/60 min aeration on/off time) were investigated in IFAS reactor assessment...
January 31, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28029051/adherence-to-a-mediterranean-diet-influences-the-fecal-metabolic-profile-of-microbial-derived-phenolics-in-a-spanish-cohort-of-middle-age-and-older-people
#11
Isabel Gutiérrez-Díaz, Tania Fernández-Navarro, Nuria Salazar, Begoña Bartolomé, M Victoria Moreno-Arribas, Enrique Juan de Andres-Galiana, Juan Luis Fernández-Martínez, Clara G de Los Reyes-Gavilán, Miguel Gueimonde, Sonia González
Despite the evidence regarding the influence of certain polyphenol food sources on the metabolic profile in feces, the association between the different phenolics provided by the diet and the fecal phenolic profile has not been elucidated. In this study, the composition of phenolic metabolites in fecal solutions was analyzed by UPLC-ESI-MS/MS in 74 volunteers. This fecal phenolic profile showed a high interindividual variation of the different compounds analyzed, phenylacetic and phenylpropionic acids being the major classes of phenolic metabolites excreted in feces...
January 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28011597/exploring-the-methanogen-and-bacterial-communities-of-rumen-environments-solid-adherent-fluid-and-epimural
#12
Thijs De Mulder, Karen Goossens, Nico Peiren, Leen Vandaele, Annelies Haegeman, Caroline De Tender, Tom Ruttink, Tom Van de Wiele, Sam De Campeneere
The rumen microbiome occupies a central role in animal health and productivity. A better understanding of the rumen ecosystem is essential to increase productivity or decrease methane production. Samples were collected from the three main rumen environments: the solid adherent fraction, the liquid fraction and the epithelium. For the liquid and solid fraction, two alternative sample processing protocols were compared, resulting in a total of five sample types: crude solids (S), the eluted solid adherent fraction (Ad), free-living species in the crude rumen liquid (CRL), strained liquid samples (Lq) and epimural scrapings (Ep)...
December 22, 2016: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/27997146/silver-sink-effect-of-humic-acid-on-bacterial-surface-colonization-in-the-presence-of-silver-ions-and-nanoparticles
#13
Alex J Bertuccio, Robert D Tilton
Silver nanoparticles (AgNPs) released from consumer products may enter the environment and possibly harm microbial communities. Prior research showed that surface-adherent AgNPs inhibit bacterial surface colonization, a precursor to biofilm formation, only when planktonic bacterial inoculum concentrations are less than a threshold level ( Wirth and co-workers, J. Colloid Interface Sci. 2016 , 467 , 17 - 27 ). This inoculum effect is due to a decrease in free silver ion concentration associated with sublethal binding to bacteria...
January 9, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/27996032/targeting-bacterial-adherence-inhibits-multidrug-resistant-pseudomonas-aeruginosa-infection-following-burn-injury
#14
Ryan M Huebinger, Daniel H Stones, Marcela de Souza Santos, Deborah L Carlson, Juquan Song, Diana Pereira Vaz, Emma Keen, Steven E Wolf, Kim Orth, Anne Marie Krachler
Classical antimicrobial drugs target proliferation and therefore place microbes under extreme selective pressure to evolve resistance. Alternative drugs that target bacterial virulence without impacting survival directly offer an attractive solution to this problem, but to date few such molecules have been discovered. We previously discovered a widespread group of bacterial adhesins, termed Multivalent Adhesion Molecules (MAMs) that are essential for initial binding of bacteria to host tissues and virulence...
December 20, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27983723/viruses-and-the-origin-of-microbiome-selection-and-immunity
#15
Steven D Quistad, Juris A Grasis, Jeremy J Barr, Forest L Rohwer
The last common metazoan ancestor (LCMA) emerged over half a billion years ago. These complex metazoans provided newly available niche space for viruses and microbes. Modern day contemporaries, such as cnidarians, suggest that the LCMA consisted of two cell layers: a basal endoderm and a mucus-secreting ectoderm, which formed a surface mucus layer (SML). Here we propose a model for the origin of metazoan immunity based on external and internal microbial selection mechanisms. In this model, the SML concentrated bacteria and their associated viruses (phage) through physical dynamics (that is, the slower flow fields near a diffusive boundary layer), which selected for mucin-binding capabilities...
December 16, 2016: ISME Journal
https://www.readbyqxmd.com/read/27981504/isolation-identification-and-screening-of-potential-probiotic-bacteria-in-milk-from-south-african-saanen-goats
#16
Goitsemang Makete, Olayinka A Aiyegoro, Mapitsi S Thantsha
This study aimed to evaluate lactic acid bacteria isolates from Saanen goats' milk for probiotic attributes, thereby determining their potential as direct-fed microbials for goats. Isolates were identified using API 50CH system, 16S rDNA sequencing and matrix-assisted laser desorption ionization-time of flight mass spectrometry. All 17 isolates obtained were identified as Lactobacillus plantarum except one identified as Pediococcus acidilactici. Four isolates identified as L. plantarum (Accession numbers KJ026587...
December 15, 2016: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/27980034/qsec-inhibition-as-an-antivirulence-approach-for-colitis-associated-bacteria
#17
Michelle G Rooks, Patrick Veiga, Analise Z Reeves, Sydney Lavoie, Koji Yasuda, Yasunari Asano, Kazufumi Yoshihara, Monia Michaud, Leslie Wardwell-Scott, Carey Ann Gallini, Jonathan N Glickman, Nobuyuki Sudo, Curtis Huttenhower, Cammie F Lesser, Wendy S Garrett
Hosts and their microbes have established a sophisticated communication system over many millennia. Within mammalian hosts, this dynamic cross-talk is essential for maintaining intestinal homeostasis. In a genetically susceptible host, dysbiosis of the gut microbiome and dysregulated immune responses are central to the development of inflammatory bowel disease (IBD). Previous surveys of stool from the T-bet(-/-)Rag2(-/-) IBD mouse model revealed microbial features that discriminate between health and disease states...
January 3, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27978817/evaluation-of-galleria-mellonella-larvae-for-studying-the-virulence-of-streptococcus-suis
#18
Nadya Velikova, Kevin Kavanagh, Jerry M Wells
BACKGROUND: Streptococcus suis is an encapsulated Gram-positive bacterium and the leading cause of sepsis and meningitis in young pigs, resulting in considerable economic losses in the porcine industry. S. suis is considered an emerging zoonotic agent with increasing numbers of human cases over the last years. In the environment, both avirulent and virulent strains occur in pigs, with no evidence for consistent adapatation of virulent strains to the human host. Currently, there is an urgent need for a convenient, reliable and standardised animal model to rapidly assess S...
December 15, 2016: BMC Microbiology
https://www.readbyqxmd.com/read/27959542/influence-of-fimbriae-on-bacterial-adhesion-and-viscoelasticity-and-correlations-of-the-two-properties-with-biofilm-formation
#19
Huabin Wang, Jonathan J Wilksch, Ligang Chen, Jason W H Tan, Richard A Strugnell, Michelle L Gee
The surface polymers of bacteria determine the ability of bacteria to adhere to a substrate for colonization, which is an essential step for a variety of microbial processes, such as biofilm formation and biofouling. Capsular polysaccharides and fimbriae are two major components on a bacterial surface, which are critical for mediating cell-surface interactions. Adhesion and viscoelasticity of bacteria are two major physical properties related to bacteria-surface interactions. In this study, we employed atomic force microscopy (AFM) to interrogate how the adhesion work and the viscoelasticity of a bacterial pathogen, Klebsiella pneumoniae, influence biofilm formation...
December 21, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27932850/co-generation-of-hydrogen-and-power-current-pulses-from-supercapacitive-mfcs-using-novel-her-iron-based-catalysts
#20
Carlo Santoro, Francesca Soavi, Catia Arbizzani, Alexey Serov, Sadia Kabir, Kayla Carpenter, Orianna Bretschger, Plamen Atanassov
In this work, four different supercapacitive microbial fuel cells (SC-MFCs) with carbon brush as the anode and an air-breathing cathode with Fe-Aminoantipyrine (Fe-AAPyr) as the catalyst have been investigated using galvanostatic discharges. The maximum power (Pmax) obtained was in the range from 1.7 mW to 1.9 mW for each SC-MFC. This in-series connection of four SC-MFCs almost quadrupled Pmax to an operating voltage of 3025 mV and a Pmax of 8.1 mW, one of the highest power outputs reported in the literature...
December 1, 2016: Electrochimica Acta
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