keyword
MENU ▼
Read by QxMD icon Read
search

plankton

keyword
https://www.readbyqxmd.com/read/28215046/genome-resolved-metagenomics-of-a-bioremediation-system-for-degradation-of-thiocyanate-in-mine-water-containing-suspended-solid-tailings
#1
Sumayah F Rahman, Rose S Kantor, Robert Huddy, Brian C Thomas, Andries W van Zyl, Susan T L Harrison, Jillian F Banfield
Thiocyanate (SCN(-) ) is a toxic compound that forms when cyanide (CN(-) ), used to recover gold, reacts with sulfur species. SCN(-) -degrading microbial communities have been studied, using bioreactors fed synthetic wastewater. The inclusion of suspended solids in the form of mineral tailings, during the development of the acclimatized microbial consortium, led to the selection of an active planktonic microbial community. Preliminary analysis of the community composition revealed reduced microbial diversity relative to the laboratory-based reactors operated without suspended solids...
February 19, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28214143/retrospective-study-of-candida-sp-contaminations-of-endoscopes-at-the-university-hospital-of-tlemcen-algeria
#2
REVIEW
I Hassaine-Lahfa, Z Boucherit-Otmani, L Sari-Belkherroubi, K Boucherit
BACKGROUND: Improper cleaning and disinfection of endoscopes has been responsible for multiple nosocomial outbreaks and sometimes serious life-threatening infections. OBJECTIVE: The aim of our study is, at first, to identify Candida species responsible for the contamination of endoscopes, and to determine the minimal inhibitory concentrations of planktonic (MIC) and sessile cells (SMIC) of amphotericin B (AmB) against our isolated strains. MATERIALS AND METHODS: The present study was performed on four endoscopes in the department of gastroenterology at the University Hospital of Tlemcen (Algeria)...
February 14, 2017: Journal de Mycologie Médicale
https://www.readbyqxmd.com/read/28213334/reactive-oxygen-a-novel-antimicrobial-mechanism-for-targeting-biofilm-associated-infection
#3
REVIEW
Matthew S Dryden, Jonathan Cooke, Rami J Salib, Rebecca E Holding, Timothy Biggs, Ali A Salamat, Raymond N Allan, Rachel S Newby, Fenella Halstead, Beryl Oppenheim, Thomas Hall, Sophie C Cox, Liam M Grover, Zain Al-Hindi, Lilyann Novak-Frazer, Malcolm D Richardson
Reactive oxygen species (ROS) is a novel therapeutic strategy for topical or local application to wounds, mucosa or internal structures where there may be heavy bacterial bioburden with biofilm and chronic inflammation. Bacterial biofilms are a significant problem in clinical settings owing to their increased tolerance towards conventionally prescribed antibiotics and their propensity for selection of further antibacterial resistance. There is therefore a pressing need for the development of alternative therapeutic strategies that can improve antibiotic efficacy towards biofilms...
February 14, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28213285/mechanical-and-chemical-studies-on-eps-from-sulfobacillus-thermosulfidooxidans-from-planktonic-to-biofilm-cells
#4
Qian Li, Wolfgang Sand
Bacteria attach to minerals and form biofilms, which can initiate and enhance bioleaching. Extracellular polymeric substances (EPS) play a crucial role during the whole process. Little is known how the cell surface/EPS mechanically and chemically respond to transformation from planktonic to biofilm cells. In this study the attachment and biofilm formation by Sulfobacillus thermosulfidooxidans were followed during pyrite leaching. Adhesiveness and stiffness of the cell/biofilm and the pyrite surface were checked by atomic force microscopy (AFM) in force mapping mode under real living conditions...
February 10, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28209775/evidence-for-environmental-and-ecological-selection-in-a-microbe-with-no-geographic-limits-to-gene-flow
#5
Kerry A Whittaker, Tatiana A Rynearson
The ability for organisms to disperse throughout their environment is thought to strongly influence population structure and thus evolution of diversity within species. A decades-long debate surrounds processes that generate and support high microbial diversity, particularly in the ocean. The debate concerns whether diversification occurs primarily through geographic partitioning (where distance limits gene flow) or through environmental selection, and remains unresolved due to lack of empirical data. Here we show that gene flow in a diatom, an ecologically important eukaryotic microbe, is not limited by global-scale geographic distance...
February 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28208670/eutrophication-and-warming-boost-cyanobacterial-biomass-and-microcystins
#6
Miquel Lürling, Frank van Oosterhout, Elisabeth Faassen
Eutrophication and warming are key drivers of cyanobacterial blooms, but their combined effects on microcystin (MC) concentrations are less studied. We tested the hypothesis that warming promotes cyanobacterial abundance in a natural plankton community and that eutrophication enhances cyanobacterial biomass and MC concentrations. We incubated natural seston from a eutrophic pond under normal, high, and extreme temperatures (i.e., 20, 25, and 30 °C) with and without additional nutrients added (eutrophication) mimicking a pulse as could be expected from projected summer storms under climate change...
February 11, 2017: Toxins
https://www.readbyqxmd.com/read/28205106/copepod-grazing-and-their-impact-on-phytoplankton-standing-stock-and-production-in-a-tropical-coastal-water-during-the-different-seasons
#7
L Jagadeesan, R Jyothibabu, N Arunpandi, S Parthasarathi
The grazing rate of copepods on the total and size-fractionated phytoplankton biomass in a coastal environment (off Kochi, southwest coast of India) were measured during pre-monsoon (PRM), peak southwest monsoon (PKSWM), late southwest monsoon (LSWM) and post-southwest monsoon (PSWM). The phytoplankton standing stock (chlorophyll a-Chl. a) and growth rate (GR) were less during the PRM (Chl. a 0.58 mg m(-3); GR 0.23 ± 0.02) and PSWM (Chl. a 0.89 mg m(-3); GR 0.30 ± 0.05) compared to PKSWM (Chl. a 6...
March 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28196974/the-efficacy-of-different-anti-microbial-metals-at-preventing-the-formation-of-and-eradicating-bacterial-biofilms-of-pathogenic-indicator-strains
#8
Natalie Gugala, Joe A Lemire, Raymond J Turner
The emergence of multidrug-resistant pathogens and the prevalence of biofilm-related infections have generated a demand for alternative anti-microbial therapies. Metals have not been explored in adequate detail for their capacity to combat infectious disease. Metal compounds can now be found in textiles, medical devices and disinfectants-yet, we know little about their efficacy against specific pathogens. To help fill this knowledge gap, we report on the anti-microbial and antibiofilm activity of seven metals: silver, copper, titanium, gallium, nickel, aluminum and zinc against three bacterial strains, Pseudomonas aeruginosa, Staphylococcus aureus and Escherichia coli...
February 15, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28196756/amberstripe-scad-decapterus-muroadsi-carangidae-fish-ingest-blue-microplastics-resembling-their-copepod-prey-along-the-coast-of-rapa-nui-easter-island-in-the-south-pacific-subtropical-gyre
#9
Nicolas Christian Ory, Paula Sobral, Joana Lia Ferreira, Martin Thiel
An increasing number of studies have described the presence of microplastics (≤5mm) in many different fish species, raising ecological concerns. The factors influencing the ingestion of microplastics by fish remain unclear despite their importance to a better understanding of the routes of microplastics through marine food webs. Here, we compare microplastics and planktonic organisms in surface waters and as food items of 20 Amberstripe scads (Decapterus muroadsi) captured along the coast of Rapa Nui (Easter Island) to assess the hypothesis that fish ingest microplastics resembling their natural prey...
February 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28196721/variations-in-anthropogenic-silver-in-a-large-patagonian-lake-correlate-with-global-shifts-in-photographic-processing-technology
#10
Romina Juncos, Linda Campbell, Marina Arcagni, Romina Daga, Andrea Rizzo, María Arribére, Sergio Ribeiro Guevara
At the beginning of the 21st century, digital imaging technology replaced the traditional silver-halide film photography which had implications in Ag contamination. Lake Nahuel Huapi is a popular Patagonia tourist destination impacted by municipal silver (Ag) contamination from photographic processing facilities since 1990's. Silver concentrations in a dated sediment core from the lake bottom showed a 10-fold increase above background levels in the second half of the 20th century, then a decrease. This trend corresponds well with published annual global photography industry demand for Ag, which clearly shows the evolution and replacement of the traditional silver-halide film photography by digital imaging technology...
February 10, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28193812/coping-with-copepods-do-right-whales-eubalaena-glacialis-forage-visually-in-dark-waters
#11
Thomas W Cronin, Jeffry I Fasick, Lorian E Schweikert, Sönke Johnsen, Lorren J Kezmoh, Mark F Baumgartner
North Atlantic right whales (Eubalaena glacialis) feed during the spring and early summer in marine waters off the northeast coast of North America. Their food primarily consists of planktonic copepods, Calanus finmarchicus, which they consume in large numbers by ram filter feeding. The coastal waters where these whales forage are turbid, but they successfully locate copepod swarms during the day at depths exceeding 100 m, where light is very dim and copepod patches may be difficult to see. Using models of E...
April 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28192988/accumulation-of-perfluoroalkylated-substances-in-oceanic-plankton
#12
Paulo Casal, Belén González-Gaya, Yifeng Zhang, Anthony J F Reardon, Jonathan W Martin, Begoña Jiménez, Jordi Dachs
The bioaccumulation of perfluoroalkylated substances (PFASs) in plankton has previously been evaluated only in freshwater and regional seas, but not for the large oligotrophic global oceans. Plankton samples from the tropical and subtropical Pacific, Atlantic and Indian Oceans were collected during the Malaspina 2010 circumnavigation expedition, and analyzed for 14 ionizable PFASs, including perfluorooctanoate (PFOA), perfluorooctane sulfonate (PFOS) and their respective linear and branched isomers. PFOA and PFOS concentrations in plankton ranged from 0...
February 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28191638/enhancement-of-the-efficacy-of-photodynamic-inactivation-of-candida-albicans-with-the-use-of-biogenic-gold-nanoparticles
#13
Irena Maliszewska, Barbara Lisiak, Katarzyna Popko, Katarzyna Matczyszyn
This study reports on successful photodynamic inactivation of planktonic and biofilm cells of Candida albicans using Rose Bengal (RB) in combination with biogenic gold nanoparticles synthesized by the cell-free filtrate of Penicillium funiculosum BL1 strain. Monodispersed colloidal gold nanoparticles coated with proteins were characterized by a number of techniques including SEM-EDS, TEM, UV-Vis absorption and fluorescence spectroscopy, as well as Fourier transform infrared spectroscopy to be 24±3 nm spheres coated with proteins...
February 12, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28187970/role-of-dop-on-the-alkaline-phosphatase-activity-of-size-fractionated-plankton-in-coastal-waters-in-the-nw-mediterranean-sea-toulon-bay-france
#14
Gérard Bogé, Magali Lespilette, Dominique Jamet, Jean-Louis Jamet
The particulate material was fractionated into 5 size classes (>90μ, 50-90μ, 6-50μ, 1-6μ, and <1μ). DOP was analysed as easily (DOPh, DOPpa) and less easily hydrolysable compounds (DOPox). Based on Vmax, 94% of the high affinity AP activity was due to <50μ cells and 77% to <1μ cells. 83% of the low affinity activity was due to >90μ cells. The high affinity activities were negatively correlated with DOP for the <50μ classes. These correlations came mostly from DOPox. They were more significant when NO3+NO2 concentrations were high, when DIP concentrations were low and when N/P ratio was >10...
February 7, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28186138/the-spectral-and-spatial-distribution-of-light-pollution-in-the-waters-of-the-northern-gulf-of-aqaba-eilat
#15
Raz Tamir, Amit Lerner, Carynelisa Haspel, Zvy Dubinsky, David Iluz
The urbanization of the shores of the Gulf of Aqaba has exposed the marine environment there, including unique fringing coral reefs, to strong anthropogenic light sources. Here we present the first in situ measurements of artificial nighttime light under water in such an ecosystem, with irradiance measured in 12 wavelength bands, at 19 measurement stations spread over 44 square km, and at 30 depths down to 30-m depth. At 1-m depth, we find downwelling irradiance values that vary from 4.6 × 10(-4) μW cm(-2) nm(-1) 500 m from the city to 1 × 10(-6) μW cm(-2) nm(-1) in the center of the gulf (9...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28186097/mismatch-between-marine-plankton-range-movements-and-the-velocity-of-climate-change
#16
William J Chivers, Anthony W Walne, Graeme C Hays
The response of marine plankton to climate change is of critical importance to the oceanic food web and fish stocks. We use a 60-year ocean basin-wide data set comprising >148,000 samples to reveal huge differences in range changes associated with climate change across 35 plankton taxa. While the range of dinoflagellates and copepods tended to closely track the velocity of climate change (the rate of isotherm movement), the range of the diatoms moved much more slowly. Differences in range shifts were up to 900 km in a recent warming period, with average velocities of range movement between 7 km per decade northwards for taxa exhibiting niche plasticity and 99 km per decade for taxa exhibiting niche conservatism...
February 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28183643/silver-deposited-carboxymethyl-chitosan-grafted-magnetic-nanoparticles-as-dual-action-deliverable-antimicrobial-materials
#17
Duc-Thang Vo, Sabrina Sabrina, Cheng-Kang Lee
Carboxymethyl chitosan (CMCS) was known to have a much better antimicrobial activity than chitosan due to the increased cationic -NH3(+) groups resulted from the intra- and intermolecular interactions between the carboxyl and amino groups. CMCS was grafted onto the surface of silica coated magnetic nanoparticles (MNPs) to obtain magnetically retrievable and deliverable antimicrobial nanoparticles (MNPs@CMCS). The presence of carboxylate groups in CMCS not only enhanced antimicrobial activity but also enabled Ag ions chelating ability to induce the in situ formation of Ag nanoparticles (AgNPs)...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28181492/molecular-composition-of-organic-matter-controls-methylmercury-formation-in-boreal-lakes
#18
Andrea G Bravo, Sylvain Bouchet, Julie Tolu, Erik Björn, Alejandro Mateos-Rivera, Stefan Bertilsson
A detailed understanding of the formation of the potent neurotoxic methylmercury is needed to explain the large observed variability in methylmercury levels in aquatic systems. While it is known that organic matter interacts strongly with mercury, the role of organic matter composition in the formation of methylmercury in aquatic systems remains poorly understood. Here we show that phytoplankton-derived organic compounds enhance mercury methylation rates in boreal lake sediments through an overall increase of bacterial activity...
February 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28178297/the-flashlight-fish-anomalops-katoptron-uses-bioluminescent-light-to-detect-prey-in-the-dark
#19
Jens Hellinger, Peter Jägers, Marcel Donner, Franziska Sutt, Melanie D Mark, Budiono Senen, Ralph Tollrian, Stefan Herlitze
Bioluminescence is a fascinating phenomenon occurring in numerous animal taxa in the ocean. The reef dwelling splitfin flashlight fish (Anomalops katoptron) can be found in large schools during moonless nights in the shallow water of coral reefs and in the open surrounding water. Anomalops katoptron produce striking blink patterns with symbiotic bacteria in their sub-ocular light organs. We examined the blink frequency in A. katoptron under various laboratory conditions. During the night A. katoptron swims in schools roughly parallel to their conspecifics and display high blink frequencies of approximately 90 blinks/minute with equal on and off times...
2017: PloS One
https://www.readbyqxmd.com/read/28178268/influence-of-ocean-acidification-on-plankton-community-structure-during-a-winter-to-summer-succession-an-imaging-approach-indicates-that-copepods-can-benefit-from-elevated-co2-via-indirect-food-web-effects
#20
Jan Taucher, Mathias Haunost, Tim Boxhammer, Lennart T Bach, María Algueró-Muñiz, Ulf Riebesell
Plankton communities play a key role in the marine food web and are expected to be highly sensitive to ongoing environmental change. Oceanic uptake of anthropogenic carbon dioxide (CO2) causes pronounced shifts in marine carbonate chemistry and a decrease in seawater pH. These changes-summarized by the term ocean acidification (OA)-can significantly affect the physiology of planktonic organisms. However, studies on the response of entire plankton communities to OA, which also include indirect effects via food-web interactions, are still relatively rare...
2017: PloS One
keyword
keyword
52181
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"