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https://www.readbyqxmd.com/read/27914001/subtilosin-prevents-biofilm-formation-by-inhibiting-bacterial-quorum-sensing
#1
Ammar Algburi, Saskia Zehm, Victoria Netrebov, Anzhelica B Bren, Vladimir Chistyakov, Michael L Chikindas
Subtilosin, the cyclic lantibiotic protein produced by Bacillus subtilis KATMIRA1933, targets the surface receptor and electrostatically binds to the bacterial cell membrane. In this study, subtilosin was purified using ammonium sulfate ((NH4)2SO4) precipitation and purified via column chromatography. Subtilosin's antibacterial minimum and sub-minimum inhibitory concentrations (MIC and sub-MIC) and anti-biofilm activity (biofilm prevention) were established. Subtilosin was evaluated as a quorum sensing (QS) inhibitor in Gram-positive bacteria using Fe(III) reduction assay...
December 2, 2016: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/27911078/laboratory-grown-subaerial-biofilms-on-granite-application-to-the-study-of-bioreceptivity
#2
Daniel Vázquez-Nion, Benita Silva, Federica Troiano, Beatriz Prieto
Simulated environmental colonisation of granite was induced under laboratory conditions in order to develop an experimental protocol for studying bioreceptivity. The experimental set-up proved suitable for producing subaerial biofilms by inoculating granite blocks with planktonic multi-species phototrophic cultures derived from natural biofilms. The ability of four different cultures to form biofilms was monitored over a three-month growth period via colour measurements, quantification of photosynthetic pigments and EPS, and CLSM observations...
December 2, 2016: Biofouling
https://www.readbyqxmd.com/read/27910930/design-of-a-hydroxyapatite-binding-antimicrobial-peptide-with-improved-retention-and-antibacterial-efficacy-for-oral-pathogen-control
#3
Zhi-Bin Huang, Xin Shi, Jing Mao, Shi-Qiang Gong
Controlling and reducing the formation of pathogenic biofilm on tooth surface is the key to the prevention and treatment of the biofilm-associated oral diseases. Antimicrobial peptides (AMPs), considered as possible future alternatives for conventional antibiotics, have been extensively studied for the control of bacterial infection. Due to the rapid dilution and degradation by human saliva, AMP preparations designed for oral use with longer retention and higher efficacy are in urgent need. To this end, a hydroxyapatite (HAp)-binding antimicrobial peptide (HBAMP), which is based on the fusion of a specific HAp-binding heptapeptide (HBP7) domain and a broad-spectrum antimicrobial peptide (KSLW) domain, has been developed in our laboratory...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910828/biofilm-prevention-of-gram-negative-bacterial-pathogens-involved-in-periprosthetic-infection-by-antibiotic-loaded-calcium-sulfate-beads-in-vitro
#4
Robert P Howlin, Christopher Winnard, Connor J Frapwell, Jeremy S Webb, John J Cooper, Sean S Aiken, Paul Stoodley
Biofilm formation represents a key stage in the pathogenesis of prosthetic infections (PIs). More tolerant to antibiotics than their planktonic counterparts, biofilm bacteria are difficult to eradicate using conventional therapeutic regimes. A common approach in PI management is the adjunctive use of localised antibiotics in addition to systemic administration in an attempt to protect the implant from colonisation by infiltrating bacteria. This study evaluates the antibacterial and antibiofilm efficacy of antibiotic-loaded dissolvable calcium sulphate, previously shown to be effective against key gram-positive pathogens, against gram-negative species important in the establishment of chronic infection in PIs...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27909688/the-danger-signal-extracellular-atp-is-an-inducer-of-fusobacterium-nucleatum-biofilm-dispersal
#5
Qinfeng Ding, Kai Soo Tan
Plaque biofilm is the primary etiological agent of periodontal disease. Biofilm formation progresses through multiple developmental stages beginning with bacterial attachment to a surface, followed by development of microcolonies and finally detachment and dispersal from a mature biofilm as free planktonic bacteria. Tissue damage arising from inflammatory response to biofilm is one of the hallmark features of periodontal disease. A consequence of tissue damage is the release of ATP from within the cell into the extracellular space...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27908581/sonodynamic-inactivation-of-gram-positive-and-gram-negative-bacteria-using-a-rose-bengal-antimicrobial-peptide-conjugate
#6
David Costley, Heather Nesbitt, Nigel Ternan, James Dooley, Ying-Ying Huang, Michael R Hamblin, Anthony P McHale, John F Callan
Combating antimicrobial resistance is one of the most serious public health challenges facing society today. The development of new antibiotics or alternative techniques that can help combat antimicrobial resistance is being prioritised by many governments and stakeholders across the globe. Antimicrobial photodynamic therapy is one such technique that has received considerable attention but is limited by the inability of light to penetrate through human tissue, reducing its effectiveness when used to treat deep-seated infections...
November 17, 2016: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/27907181/the-role-of-ocean-currents-in-the-temperature-selection-of-plankton-insights-from-an-individual-based-model
#7
Ferdi L Hellweger, Erik van Sebille, Benjamin C Calfee, Jeremy W Chandler, Erik R Zinser, Brandon K Swan, Neil D Fredrick
Biogeography studies that correlate the observed distribution of organisms to environmental variables are typically based on local conditions. However, in cases with substantial translocation, like planktonic organisms carried by ocean currents, selection may happen upstream and local environmental factors may not be representative of those that shaped the local population. Here we use an individual-based model of microbes in the global surface ocean to explore this effect for temperature. We simulate up to 25 million individual cells belonging to up to 50 species with different temperature optima...
2016: PloS One
https://www.readbyqxmd.com/read/27904808/effect-of-common-and-experimental-anti-tuberculosis-treatments-on-mycobacterium-tuberculosis-growing-as-biofilms
#8
James P Dalton, Benedict Uy, Narisa Phummarin, Brent R Copp, William A Denny, Simon Swift, Siouxsie Wiles
Much is known regarding the antibiotic susceptibility of planktonic cultures of Mycobacterium tuberculosis, the bacterium responsible for the lung disease tuberculosis (TB). As planktonically-grown M. tuberculosis are unlikely to be entirely representative of the bacterium during infection, we set out to determine how effective a range of anti-mycobacterial treatments were against M. tuberculosis growing as a biofilm, a bacterial phenotype known to be more resistant to antibiotic treatment. Light levels from bioluminescently-labelled M...
2016: PeerJ
https://www.readbyqxmd.com/read/27903421/-210-po-in-the-marine-biota-of-korean-coastal-waters-and-the-effective-dose-from-seafood-consumption
#9
S H Kim, G H Hong, H M Lee, B E Cho
The activity concentrations of (210)Po were determined in plankton and selected species of macroalgae, crustaceans, molluscs, and fish from Korean coastal waters to understand (210)Po distribution in these trophic levels and to assess the effective dose of (210)Po from seafood ingested by the average Korean. The activity concentration of (210)Po in macroalgae, mixed plankton, anchovy (whole body), abalone muscle, and abalone viscera was 0.97-1.43, 32-137, 59-392, 2.93 ± 0.86, and 1495 ± 484 Bq kg(-1) (w...
November 28, 2016: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/27902758/oldenlandia-diffusa-extract-inhibits-biofilm-formation-by-haemophilus-influenzae-clinical-isolates
#10
Takeaki Wajima, Yui Anzai, Tetsuya Yamada, Hideaki Ikoshi, Norihisa Noguchi
Oldenlandia diffusa has been empirically used as a therapeutic adjunct for the treatment of respiratory infections. To establish the basic evidence of its clinical usefulness, antimicrobial and biofilm inhibitory activities of an O. diffusa extract were examined against clinical isolates of Haemophilus influenzae, a major causative pathogen of respiratory and sensory organ infections. No significant growth inhibitory activity was observed during incubation for more than 6 h after the extract addition into a culture of H...
2016: PloS One
https://www.readbyqxmd.com/read/27902440/synechococcus-diversity-along-a-trophic-gradient-in-the-osterseen-lake-district-bavaria
#11
Joachim Ruber, Franziska Bauer, Andrew Millard, Uta Raeder, Jürgen Geist, Katrin Zwirglmaier
Picocyanobacteria are important primary producers in freshwater, however there is still a knowledge gap regarding their diversity at the strain level. For this reason, the microbial diversity of four lakes with different trophic states was investigated by sequencing of the 16S rRNA gene using universal primers. The study was performed in selected lakes of the Osterseen Lake District, Germany, from 2012 to 2014 (Lake Schiffhuettensee: eutrophic; Lake Ostersee: meso-oligotrophic; Lake Groebensee: oligotrophic; Lake Lustsee: oligotrophic)...
November 1, 2016: Microbiology
https://www.readbyqxmd.com/read/27901192/evaluation-of-the-complexity-and-performance-of-marine-planktonic-trophic-models
#12
Suzana G Leles, Jean L Valentin, Gisela M Figueiredo
Planktonic models represent a powerful tool for creating hypotheses and making predictions about the functioning of marine ecosystems. Their complexity varies according to the number of state variables and the choice of functional forms. We evaluated plankton models during the last 15 years (n =145) with the aims of understanding why they differ in complexity, evaluating model robustness, and describing studies of plankton modelling around the globe. We classified models into four groups: Nutrient-Phytoplankton-Zooplankton (NPZ), Nutrient-Phytoplankton-Zooplankton-Detritus (NPZD), Size-Structured (SS) and Plankton-Functional-Type (PFT)...
2016: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/27900461/microbial-food-web-drivers-in-tropical-reservoirs
#13
Carolina Davila Domingues, Lucia Helena Sampaio da Silva, Luciana Machado Rangel, Leonardo de Magalhães, Adriana de Melo Rocha, Lúcia Meirelles Lobão, Rafael Paiva, Fábio Roland, Hugo Sarmento
Element cycling in aquatic systems is driven chiefly by planktonic processes, and the structure of the planktonic food web determines the efficiency of carbon transfer through trophic levels. However, few studies have comprehensively evaluated all planktonic food-web components in tropical regions. The aim of this study was to unravel the top-down controls (metazooplankton community structure), bottom-up controls (resource availability), and hydrologic (water residence time) and physical (temperature) variables that affect different components of the microbial food web (MFW) carbon stock in tropical reservoirs, through structural equation models (SEM)...
November 29, 2016: Microbial Ecology
https://www.readbyqxmd.com/read/27900438/start-up-and-bacterial-community-compositions-of-partial-nitrification-in-moving-bed-biofilm-reactor
#14
Tao Liu, Yan-Jun Mao, Yan-Ping Shi, Xie Quan
Partial nitrification (PN) has been considered as one of the promising processes for pretreatment of ammonium-rich wastewater. In this study, a kind of novel carriers with enhanced hydrophilicity and electrophilicity was implemented in a moving bed biofilm reactor (MBBR) to start up PN process. Results indicated that biofilm formation rate was higher on modified carriers. In comparison with the reactor filled with traditional carriers (start-up period of 21 days), it took only 14 days to start up PN successfully with ammonia removal efficiency and nitrite accumulation rate of 90 and 91%, respectively, in the reactor filled with modified carriers...
November 30, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27893740/low-co2-sensitivity-of-microzooplankton-communities-in-the-gullmar-fjord-skagerrak-evidence-from-a-long-term-mesocosm-study
#15
Henriette G Horn, Nils Sander, Annegret Stuhr, María Algueró-Muñiz, Lennart T Bach, Martin G J Löder, Maarten Boersma, Ulf Riebesell, Nicole Aberle
Ocean acidification is considered as a crucial stressor for marine communities. In this study, we tested the effects of the IPCC RPC6.0 end-of-century acidification scenario on a natural plankton community in the Gullmar Fjord, Sweden, during a long-term mesocosm experiment from a spring bloom to a mid-summer situation. The focus of this study was on microzooplankton and its interactions with phytoplankton and mesozooplankton. The microzooplankton community was dominated by ciliates, especially small Strombidium sp...
2016: PloS One
https://www.readbyqxmd.com/read/27890730/cathodic-voltage-controlled-electrical-stimulation-of-titanium-for-prevention-of-methicillin-resistant-staphylococcus-aureus-and-acinetobacter-baumannii-biofilm-infections
#16
Mary Canty, Nicole Luke-Marshall, Anthony Campagnari, Mark Ehrensberger
: Antibiotic resistance of bacterial biofilms limits available treatment methods for implant-associated orthopaedic infections. This study evaluated the effects of applying cathodic voltage-controlled electrical stimulations (CVCES) of -1.5V and -1.8V (vs. Ag/AgCl) to coupons of commercially pure titanium (cpTi) incubated in cultures of methicillin-resistant Staphylococcus aureus (MRSA) and Acinetobacter baumannii (A. baumannii) as a method of preventing bacterial attachment. Stimulations were applied for 2, 4, and 8 hours and coupon-associated and planktonic colony-forming units (CFU) were enumerated following stimulation...
November 24, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27889953/ecology-under-lake-ice
#17
REVIEW
Stephanie E Hampton, Aaron W E Galloway, Stephen M Powers, Ted Ozersky, Kara H Woo, Ryan D Batt, Stephanie G Labou, Catherine M O'Reilly, Sapna Sharma, Noah R Lottig, Emily H Stanley, Rebecca L North, Jason D Stockwell, Rita Adrian, Gesa A Weyhenmeyer, Lauri Arvola, Helen M Baulch, Isabella Bertani, Larry L Bowman, Cayelan C Carey, Jordi Catalan, William Colom-Montero, Leah M Domine, Marisol Felip, Ignacio Granados, Corinna Gries, Hans-Peter Grossart, Juta Haberman, Marina Haldna, Brian Hayden, Scott N Higgins, Jeff C Jolley, Kimmo K Kahilainen, Enn Kaup, Michael J Kehoe, Sally MacIntyre, Anson W Mackay, Heather L Mariash, Robert M McKay, Brigitte Nixdorf, Peeter Nõges, Tiina Nõges, Michelle Palmer, Don C Pierson, David M Post, Matthew J Pruett, Milla Rautio, Jordan S Read, Sarah L Roberts, Jacqueline Rücker, Steven Sadro, Eugene A Silow, Derek E Smith, Robert W Sterner, George E A Swann, Maxim A Timofeyev, Manuel Toro, Michael R Twiss, Richard J Vogt, Susan B Watson, Erika J Whiteford, Marguerite A Xenopoulos
Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer 'growing seasons'. We executed the first global quantitative synthesis on under-ice lake ecology, including 36 abiotic and biotic variables from 42 research groups and 101 lakes, examining seasonal differences and connections as well as how seasonal differences vary with geophysical factors...
November 27, 2016: Ecology Letters
https://www.readbyqxmd.com/read/27889948/a-new-sequence-dataset-of-ssu-rrna-gene-for-scleractinia-and-its-phylogenetic-and-ecological-applications
#18
Roberto Arrigoni, Benoît Vacherie, Francesca Benzoni, Fabrizio Stefani, Eric Karsenti, Olivier Jaillon, Fabrice Not, Flavia Nunes, Claude Payri, Patrick Wincker, Valérie Barbe
Scleractinian corals (i.e. hard corals) play a fundamental role in building and maintaining coral reefs, one of the most diverse ecosystems on Earth. Nevertheless, their phylogenies remain largely unresolved and little is known about dispersal and survival of their planktonic larval phase. The small subunit ribosomal RNA (SSU rRNA) is a commonly-used gene for DNA barcoding in several metazoans, and small variable regions of SSU rRNA are largely adopted as barcode marker to investigate marine plankton community structure worldwide...
November 27, 2016: Molecular Ecology Resources
https://www.readbyqxmd.com/read/27889617/aquatic-viral-metagenomics-lights-and-shadows
#19
REVIEW
Alberto Rastrojo, Antonio Alcamí
Viruses are the most abundant biological entities on Earth, exceeding bacteria in most of the ecosystems. Specially in oceans, viruses are thought to be the major planktonic predators shaping microorganism communities and controlling ocean biological capacity. Plankton lysis by viruses plays an important role in ocean nutrient and energy cycles. Viral metagenomics has emerged as a powerful tool to uncover viral diversity in aquatic ecosystems through the use of Next Generation Sequencing. However, many of the commonly used viral sample preparation steps have several important biases that must be considered to avoid a misinterpretation of the results...
November 24, 2016: Virus Research
https://www.readbyqxmd.com/read/27888714/a-cryptic-marine-ciliate-feeds-on-progametes-of-noctiluca-scintillans
#20
Shuwen Zhang, Kit Yu Karen Chan, Zhuo Shen, Shunyan Cheung, Michael R Landry, Hongbin Liu
The dinoflagellate Noctiluca scintillans (Noctiluca) has the ability to reproduce sexually, which may help to increase or restore its population size during periods of blooms or environmental stress. Here, we documented for the first time a marine ciliate Strombidium sp. that feeds on Noctiluca's progametes undergoing stages 5 to 9 of nuclear division. This ciliate frequently swam on or around gametogenic and some vegetative Noctiluca cells. The ciliates associated with gametogenic cells had significantly lower swimming speed and changed direction more frequently than those associated with vegetative cells, which overall increased their time spent around the food patches (progametes)...
August 31, 2016: Protist
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