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https://www.readbyqxmd.com/read/29118646/epilithic-diatom-communities-of-selected-streams-from-the-lerma-chapala-basin-central-mexico-with-the-description-of-two-new-species
#1
Demetrio Mora, Javier Carmona, Regine Jahn, Jonas Zimmermann, Nélida Abarca
The Lerma-Chapala Basin, in Central Mexico, is geologically heterogeneous, climatically diverse and boasts high biodiversity, lying within two Biodiversity Hotspots, namely Mesoamerica and the Madrean Pine-Oak Woodlands. Epilithon and water samples were collected in the basin from 14 sampling sites three times each, two sampling campaigns during the rainy season and one in the dry season. A total of 274 infrageneric taxa in 48 genera were recorded. The taxonomic composition observed was dominated by taxa from the genera Nitzschia, Gomphonema, Pinnularia, Navicula, Sellaphora and Eunotia...
2017: PhytoKeys
https://www.readbyqxmd.com/read/29083230/marine-antifouling-performance-of-polymer-coatings-incorporating-zwitterions
#2
Claudia Ventura, Andrew J Guerin, Osama El-Zubir, Antonio J Ruiz-Sanchez, Luke I Dixon, Kevin J Reynolds, Marie L Dale, James Ferguson, Andrew Houlton, Benjamin R Horrocks, Anthony S Clare, David A Fulton
Zwitterionic materials display antifouling promise, but their potential in marine anti-biofouling is still largely unexplored. This study evaluates the effectiveness of incorporating small quantities (0-20% on a molar basis) of zwitterions as sulfobetaine methacrylate (SBMA) or carboxybetaine methacrylate (CBMA) into lauryl methacrylate-based coatings whose relatively hydrophobic nature encourages adhesion of the diatom Navicula incerta, a common microfouling organism responsible for the formation of 'slime'...
October 30, 2017: Biofouling
https://www.readbyqxmd.com/read/29035714/biodegradation-of-triclosan-in-diatom-navicula-sp-kinetics-transformation-products-toxicity-evaluation-and-the-effects-of-ph-and-potassium-permanganate
#3
Tengda Ding, Kunde Lin, Mengting Yang, Lianjun Bao, Juying Li, Bo Yang, Jay Gan
Triclosan (TCS) is one of the most widely used pharmaceutically active compounds and frequently detected in treated wastewater and the impacted aquatic environment. However, the fate and toxicity of TCS in aquatic organisms is poorly known, including in particular the potential for the formation of incomplete biological transformation products. In this study, TCS posed high toxic effects (e.g., growth inhibition and damage of photosynthesis) to typical freshwater diatom Navicula sp., with the 24h and 72h EC50 values of 173...
September 21, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28965670/allelopathic-effects-of-diatom-filtrates-on-the-toxic-benthic-dinoflagellate-ostreopsis-cf-ovata
#4
Salvatore Pichierri, Stefano Accoroni, Laura Pezzolesi, Franca Guerrini, Tiziana Romagnoli, Rossella Pistocchi, Cecilia Totti
Ostreopsis blooms regularly occur in many Mediterranean coastal areas in late summer-autumn. In the northern Adriatic Sea, Ostreopsis blooms affect diatom-dominated microphytobenthic communities. In this study, the effects of the filtrates of some diatom species, both benthic (Tabularia affinis, Proschkinia complanatoides and Navicula sp.) and planktonic (Thalassiosira sp. and Skeletonema marinoi) on cell morphology, cytological features and growth of O. cf. ovata were investigated. Our results showed a marked decrease of O...
October 2017: Marine Environmental Research
https://www.readbyqxmd.com/read/28963632/optimisation-of-critical-medium-components-and-culture-conditions-for-enhanced-biomass-and-lipid-production-in-the-oleaginous-diatom-navicula-phyllepta-a-statistical-approach
#5
Sanyo Sabu, Isaac Sarojini Bright Singh, Valsamma Joseph
Diatoms hold great promise as potential sources of biofuel production. In the present study, the biomass and lipid production in the marine diatom Navicula phyllepta, isolated from Cochin estuary, India and identified as a potential biodiesel feedstock, were optimized using Plackett-Burman (PB) statistical experimental design followed by central composite design (CCD) and response surface methodology (RSM). The growth analyses of the isolate in different nitrogen sources, salinities and five different enriched sea water media showed the best growth in the cheapest medium with minimum components using urea as nitrogen source at salinity between 25 and 40 g kg(-1)...
September 29, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28934317/photosynthetic-epibionts-and-endobionts-of-pacific-oyster-shells-from-oyster-reefs-in-rocky-versus-mudflat-shores
#6
Laurent Barillé, Anthony Le Bris, Vona Méléder, Patrick Launeau, Marc Robin, Ioanna Louvrou, Lourenço Ribeiro
The Pacific oyster, Crassostrea gigas (Thunberg), is the main bivalve species cultivated in the world. With global warming enabling its reproduction and larval survival at higher latitudes, this species is now recognized as invasive and creates wild oyster reefs globally. In this study, the spatial distribution of photosynthetic assemblages colonizing the shells of wild C. gigas was investigated on both a large scale (two contrasting types of reefs found in mudflats and rocky areas) and a small scale (within individual shells) using a hyperspectral imager...
2017: PloS One
https://www.readbyqxmd.com/read/28811874/functional-roles-of-an-engineer-species-for-coastal-benthic-invertebrates-and-demersal-fish
#7
Aurélie Chaalali, Anik Brind'Amour, Stanislas F Dubois, Hervé Le Bris
Through their tissues or activities, engineer species create, modify, or maintain habitats and alter the distribution and abundance of many plants and animals. This study investigates key ecological functions performed by an engineer species that colonizes coastal ecosystems. The gregarious tubiculous amphipod Haploops nirae is used as a biological model. According to previous studies, the habitat engineered by H. nirae (i.e., Haploops habitat) could provide food and natural shelter for several benthic species such as benthic diatoms belonging to the gender Navicula, the micrograzer Geitodoris planata, or the bivalve Polititapes virgineus...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28697398/pufas-and-puas-production-in-three-benthic-diatoms-from-the-northern-adriatic-sea
#8
Laura Pezzolesi, Salvatore Pichierri, Chiara Samorì, Cecilia Totti, Rossella Pistocchi
The production of polyunsaturated aldehydes (PUAs) has been reported by many planktonic diatoms, where they have been implicated in deleterious effects on copepod reproduction and growth of closeby microbes or suggested as infochemicals in shaping plankton interactions. This study investigates the production of PUAs by diatoms commonly occurring in the microphytobenthic communities in temperate regions: Tabularia affinis, Proschkinia complanatoides and Navicula sp. Results highlight the production of PUAs by the three benthic diatoms during stationary and decline phases, with intracellular concentrations from 1...
October 2017: Phytochemistry
https://www.readbyqxmd.com/read/28686991/contribution-to-the-improvement-of-diatom-based-assessments-of-the-ecological-status-of-large-rivers-the-sava-river-case-study
#9
Božica Vasiljević, Snežana B Simić, Momir Paunović, Tea Zuliani, Jelena Krizmanić, Vanja Marković, Jelena Tomović
The Sava River Basin is a major drainage basin of southeastern Europe, significantly influenced by anthropogenic activities. Our study was focused on diatom communities as an indicator of the ecological status of running waters. We investigated over 937km of the Sava River at 19 sampling sites. Benthic diatom communities and 17 diatom indices were analyzed along with a large set of environmental parameters. CCA revealed that the most important elements along the spatial gradient were As and Si. Our results show that the species Navicula recens (Lange-Bert...
December 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28675050/microfluidic-accumulation-assay-probes-attachment-of-biofilm-forming-diatom-cells
#10
Kim A Nolte, Jana Schwarze, Axel Rosenhahn
Testing of fouling release (FR) technologies is of great relevance for discovery of the next generation of protective marine coatings. In this paper, an accumulation assay to test diatom interaction under laminar flow with the model organism Navicula perminuta is introduced. Using time lapse microscopy with large area sampling allows determination of the accumulation kinetics of the diatom on three model surfaces with different surface properties at different wall shear stresses. The hydrodynamic conditions within the flow cell are described and a suitable shear stress range to perform accumulation experiments is identified at which statistically significant discrimination of surfaces is possible...
August 2017: Biofouling
https://www.readbyqxmd.com/read/28628993/the-impact-of-silver-nanoparticles-on-marine-plankton-dynamics-dependence-on-coating-size-and-concentration
#11
Anastasia Tsiola, Paraskevi Pitta, Agnès Junyer Callol, Margarita Kagiorgi, Ioanna Kalantzi, Kyriaki Mylona, Ioulia Santi, Claudio Toncelli, Spyros Pergantis, Manolis Tsapakis
During this study, three microcosm experiments were carried out with natural coastal seawater, collected in the Eastern Mediterranean Sea, in order to assess the effect of silver nanoparticle (AgNP) exposure to natural plankton communities. The impact of coating (branched-polyethyleneimine: BPEI vs. poly-vinylpyrrolidone: PVP), size (40 vs. 60nm), concentration (200, 500, 2000, 5000 and 10,000ng Ag L(-1)) and silver form (dissolved Ag(+) vs. AgNPs) were tested. The results of chlorophyll a concentration revealed that PVP AgNPs caused a higher toxicity than BPEI AgNPs, and this was possibly related to the measured higher dissolution rate...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28623567/molecular-identification-and-comparative-evaluation-of-tropical-marine-microalgae-for-biodiesel-production
#12
Sanyo Sabu, I S Bright Singh, Valsamma Joseph
Marine microalgae have emerged as important feedstock for liquid biofuel production. The identification of lipid-rich native microalgal species with high growth rate and optimal fatty acid profile and biodiesel properties is the most challenging step in microalgae-based biodiesel production. In this study, attempts have been made to bio-prospect the biodiesel production potential of marine and brackish water microalgal isolates from the west coast of India. A total of 14 microalgal species were isolated, identified using specific molecular markers and based on the lipid content; seven species with total lipid content above 20% of dry cell weight were selected for assessing biodiesel production potential in terms of lipid and biomass productivities, nile red fluorescence, fatty acid profile and biodiesel properties...
August 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28488428/contribution-of-charges-in-polyvinyl-alcohol-networks-to-marine-antifouling
#13
Wufang Yang, Peng Lin, Daocang Cheng, Longzhou Zhang, Yang Wu, Yupeng Liu, Xiaowei Pei, Feng Zhou
Semi-interpenetrated polyvinyl alcohol polymer networks (SIPNs) were prepared by integrating various charged components into polyvinyl alcohol polymer. Contact angle measurement, attenuated total reflection Fourier transform infrared spectroscopy, field emission scanning electron microscopy, and tensile tests were used to characterize the physicochemical properties of the prepared SIPNs. To investigate the contribution of charges to marine antifouling, the adhesion behaviors of green algae Dunaliella tertiolecta and diatoms Navicula sp...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28477173/shared-epizoic-taxa-and-differences-in-diatom-community-structure-between-green-turtles-chelonia-mydas-from-distant-habitats
#14
Roksana Majewska, Bart Van de Vijver, Ali Nasrolahi, Maryam Ehsanpour, Majid Afkhami, Federico Bolaños, Franco Iamunno, Mario Santoro, Mario De Stefano
The first reports of diatoms growing on marine mammals date back to the early 1900s. However, only recently has direct evidence been provided for similar associations between diatoms and sea turtles. We present a comparison of diatom communities inhabiting carapaces of green turtles Chelonia mydas sampled at two remote sites located within the Indian (Iran) and Atlantic (Costa Rica) Ocean basins. Diatom observations and counts were carried out using scanning electron microscopy. Techniques involving critical point drying enabled observations of diatoms and other microepibionts still attached to sea turtle carapace and revealed specific aspects of the epizoic community structure...
November 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28475985/long-alkyl-chain-imidazolium-ionic-liquids-antibiofilm-activity-against-phototrophic-biofilms
#15
G Kiran Kumar Reddy, Y V Nancharaiah, V P Venugopalan
Biofilm formation is problematic and hence undesirable in medical and industrial settings. In addition to bacteria, phototrophic organisms are an integral component of biofilms that develop on surfaces immersed in natural waters. 1-Alkyl-3-methyl imidazolium ionic liquids (IL) with varying alkyl chain length were evaluated for their influence on the formation of monospecies (Navicula sp.) and multispecies biofilms under phototrophic conditions. An IL with a long alkyl side chain, 1-hexadecyl-3-methylimidaazolium chloride ([C16(MIM)][Cl]) retarded growth, adhesion and biofilm formation of Navicula sp...
April 23, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28432510/epilithic-diatom-assemblages-and-their-relationships-with-environmental-variables-in-the-nil%C3%A3-fer-stream-basin-bursa-turkey
#16
Didem Karacaoğlu, Nurhayat Dalkıran
Patterns of epilithic diatom species distribution in relation to environmental variables from 12 sampling sites on the main stream and some of its tributaries in the Nilüfer Stream Basin were determined using multivariate statistical techniques. The stream basin has been heavily influenced by anthropogenic effects. The upper part of the basin that is distant from pollution sources mostly has a spring water quality, while the lower part where the stream flows through the urban area and receives domestic and industrial wastewater has a quite low quality...
May 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28429593/model-amphiphilic-block-copolymers-with-tailored-molecular-weight-and-composition-in-pdms-based-films-to-limit-soft-biofouling
#17
Brandon M Wenning, Elisa Martinelli, Sophie Mieszkin, John A Finlay, Daniel Fischer, James A Callow, Maureen E Callow, Amanda K Leonardi, Christopher K Ober, Giancarlo Galli
A set of controlled surface composition films was produced utilizing amphiphilic block copolymers dispersed in a cross-linked poly(dimethylsiloxane) network. These block copolymers contained oligo(ethylene glycol) (PEGMA) and fluoroalkyl (AF6) side chains in selected ratios and molecular weights to control surface chemistry including antifouling and fouling-release performance. Such properties were assessed by carrying out assays using two algae, the green macroalga Ulva linza (favors attachment to polar surfaces) and the unicellular diatom Navicula incerta (favors attachment to nonpolar surfaces)...
May 2, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28374061/spatio-temporal-variations-of-marine-biofilm-communities-colonizing-artificial-substrata-including-antifouling-coatings-in-contrasted-french-coastal-environments
#18
Jean-François Briand, Aude Barani, Cédric Garnier, Karine Réhel, Félix Urvois, Christophe LePoupon, Agnès Bouchez, Didier Debroas, Christine Bressy
Surface colonization in seawater first corresponds to the selection of specific microbial biofilm communities. By coupling flow cytometry, microscopy and high throughput sequencing (HTS, 454 pyrosequencing) with artificial surfaces and environmental analyses, we intend to identify the contribution of biofilm community drivers at two contrasted French sites, one temperate and eutrophic (Lorient, Atlantic coast) and the other at a mesotrophic but highly contaminated bay (Toulon, North-Western Mediterranean Sea)...
April 3, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28369472/diversity-of-co2-concentrating-mechanisms-and-responses-to-co2-concentration-in-marine-and-freshwater-diatoms
#19
Romain Clement, Erik Jensen, Laura Prioretti, Stephen C Maberly, Brigitte Gontero
The presence of CO2-concentrating mechanisms (CCMs) is believed to be one of the characteristics that allows diatoms to thrive in many environments and to be major contributors to global productivity. Here, the type of CCM and the responses to variable CO2 concentration were studied in marine and freshwater diatoms. At 400 ppm, there was a large diversity in physiological and biochemical mechanisms among the species. While Phaeodactylum tricornutum mainly used HCO3-, Thalassiosira pseudonana mainly used CO2...
June 1, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28270054/marine-anti-biofouling-efficacy-of-amphiphilic-poly-coacrylate-grafted-pdmse-effect-of-graft-molecular-weight
#20
Cary A Kuliasha, John A Finlay, Sofia C Franco, Anthony S Clare, Shane J Stafslien, Anthony B Brennan
There is currently strong motivation due to ecological concerns to develop effective anti-biofouling coatings that are environmentally benign, durable, and stable for use by the maritime industry. The antifouling (AF) and fouling-release (FR) efficacy of amphiphilic, charged copolymers composed of ~52% acrylamide, ~34% acrylic acid, and ~14% methyl acrylate grafted to poly(dimethyl siloxane) (PDMSe) surfaces were tested against zoospores of the green alga Ulva linza and the diatom Navicula incerta. The biofouling response to molecular weight variation was analyzed for grafts ranging from ~100 to 1,400 kg mol(-1), The amphiphilic coatings showed a marked improvement in the FR response, with a 55% increase in the percentage removal of diatoms and increased AF efficacy, with 92% reduction in initial attachment density of zoospores, compared to PDMSe controls...
March 2017: Biofouling
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