|   | 
Details
   web
Records
Author Besaury, L.; Ouddane, B.; Pavissich, J.P.; Dubrulle-Brunaud, C.; Gonzalez, B.; Quillet, L.
Title Impact of copper on the abundance and diversity of sulfate-reducing prokaryotes in two chilean marine sediments Type
Year 2012 Publication Marine Pollution Bulletin Abbreviated Journal Mar. Pollut. Bull.
Volume 64 Issue 10 Pages 2135-2145
Keywords Marine sediment; Copper contamination; Sulfate-reducing prokaryotes; Real-time PCR; DGGE; Phylogenetic analysis
Abstract We studied the abundance and diversity of the sulfate-reducing prokaryotes (SRPs) in two 30-cm marine chilean sediment cores, one with a long-term exposure to copper-mining residues, the other being a non-exposed reference sediment. The abundance of SRPs was quantified by qPCR of the dissimilatory sulfite reductase gene beta-subunit (dsrB) and showed that SRPs are sensitive to high copper concentrations, as the mean number of SRPs all along the contaminated sediment was two orders of magnitude lower than in the reference sediment. SRP diversity was analyzed by using the dsrB-sequences-based PCR-DGGE method and constructing gene libraries for dsrB-sequences. Surprisingly, the diversity was comparable in both sediments, with dsrB sequences belonging to Desulfobacteraceae, Syntrophobacteraceae, and Desulfobulbaceae, SRP families previously described in marine sediments, and to a deep branching dsrAB lineage. The hypothesis of the presence of horizontal transfer of copper resistance genes in the microbial population of the polluted sediment is discussed. (C) 2012 Elsevier Ltd. All rights reserved.
Address [Besaury, Ludovic; Quillet, Laurent] Univ Rouen, Lab Univ MEBE Microbiol Environm & Biol Evolut, F-76821 Mont St Aignan, France, Email: ludovic.besaury@etu.univ-rouen.fr;
Corporate Author Thesis
Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0025-326x ISBN Medium
Area Expedition Conference
Notes WOS:000310929500032 Approved
Call Number UAI @ eduardo.moreno @ Serial 254
Permanent link to this record
 

 
Author Garcia-Huidobro, M.R.; Poupin, M.J.; Urrutia, C.; Rodriguez-Navarro, A.B.; Grenier, C.; Vivanco, J.F.; Ramajo, L.; Benjumeda, I.; Lagos, N.A.; Lardies, M.A.
Title An intrapopulational study of organic compounds and biomechanical properties of the shell of the Antarctic bivalve Laternula elliptica (P. P. King, 1832) at King George Island Type
Year 2021 Publication Polar Biology Abbreviated Journal Polar Biol.
Volume 44 Issue Pages 13431352
Keywords ALLOMETRIC SCALING LAWS; BRODERIP ANOMALODESMATA; SEASONAL ENERGETICS; OCEAN ACIDIFICATION; COLD ADAPTATION; MARINE MOLLUSKS; ORIGIN; MICROSTRUCTURE; METABOLISM; CAPACITY
Abstract Laternula elliptica is a key bivalve species and widely distributed around the Antarctic continent. This bivalve has been the study subject in several studies centered on ecological, physiological, biochemical, and behavioral patterns. However, little is known about the chemistry and the biomechanical properties of the shells of this mollusk. Here, we present the first report of the intra-population variability in the organic composition and mechanical properties of L. elliptica shells. Further, we analyze different morphological traits and their association with the metabolism of a population of L. elliptica from King George Island, Western Antarctic Peninsula. The summer metabolic rates and the hepatosomatic index values indicate good health conditions of this clam's population. Shell periostracum chemistry is quite similar to bivalves from temperate regions, but the relative amount of protein increased ca. five-fold in shells of L. elliptica. The microhardness is approximately 32% lower than in bivalves from temperate regions. Our characterization of the L. elliptica shells suggests that periostracum chemistry could be specially fitted to avoid shell carbon exposure to dissolution (e.g., in corrosive acidified seawater). In contrast, the reduction in shell hardness may result from prioritizing behavioral (burial) and shell repairing strategies to confront biological (predators) and physical disturbances (e.g., ice scouring). Similar studies in other Antarctic mollusks will help understand the role of shell structure and function in confronting projected climate changes in the Antarctic ocean.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0722-4060 ISBN Medium
Area Expedition Conference
Notes WOS:000652939100001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1412
Permanent link to this record
 

 
Author Govindan, R.; Gnanasekaran, C.; Govindan, R.; Muthuchamy, M.; Quero, F.; Jothi, A.; Chelliah, C.K.; Arunachalam, A.; Mangalaraja, R.V.; Natesan, M,; Kadaikunnan, S,; Li, W.J.
Title Anti-quorum Sensing and Anti-biofilm Effect of Nocardiopsis synnemataformans RMN 4 (MN061002) Compound 2,6-Di-tert-butyl, 1,4-Benzoquinone Against Biofilm-Producing Bacteria Type
Year 2023 Publication Applied Biochemistry And Biotechnology Abbreviated Journal Appl. Biochem. Biotechnol.
Volume Early Access Issue Pages
Keywords Marine actinomycetes; Spectroscopic analysis, HPLC purification, Anti-QS activity; Anti-biofilm activity; Scanning electron microscopy
Abstract In this study, the anti-biofilm compound of 2,6-Di-tert-butyl, 1,4-benzoquinone was purified from Nocardiopsis synnemataformans (N. synnemataformans) RMN 4 (MN061002). To confirm the compound, various spectroscopy analyses were done including ultraviolet (UV) spectrometer, Fourier transform infrared spectroscopy (FTIR), analytical high-performance liquid chromatography (HPLC), preparative HPLC, gas chromatography-mass spectroscopy (GC-MS), liquid chromatography-mass spectroscopy (LC-MS), and 2D nuclear magnetic resonance (NMR). Furthermore, the purified compound was shown 94% inhibition against biofilm-producing Proteus mirabilis (P. mirabilis) (MN396686) at 70 mu g/mL concentrations. Furthermore, the metabolic activity, exopolysaccharide damage, and hydrophobicity degradation results of identified compound exhibited excellent inhibition at 100 mu g/mL concentration. Furthermore, the confocal laser scanning electron microscope (CLSM) and scanning electron microscope (SEM) results were shown with intracellular damages and architectural changes in bacteria. Consecutively, the in vivo toxicity effect of the compound against Artemia franciscana (A. franciscana) was shown to have a low mortality rate at 100 mu g/mL. Finally, the molecular docking interaction between the quorum sensing (QS) genes and identified compound clearly suggested that the identified compound 2,6-Di-tert-butyl, 1,4-benzoquinone has anti-quorum sensing and anti-biofilm activities against P. mirabilis (MN396686).
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0273-2289 ISBN Medium
Area Expedition Conference
Notes WOS:001105945900003 Approved
Call Number UAI @ alexi.delcanto @ Serial 1931
Permanent link to this record
 

 
Author Lardies, MA.; Caballero, P.; Duarte, C.; Poupin, M.J.
Title Geographical Variation in Phenotypic Plasticity of Intertidal Sister Limpet's Species Under Ocean Acidification Scenarios Type
Year 2021 Publication Frontiers in Marine Science Abbreviated Journal Front. Mar. Sci.
Volume 8 Issue Pages 647087
Keywords METABOLIC-RATE; CLIMATE-CHANGE; SEAWATER ACIDIFICATION; CARBONIC-ACID; HIGH PCO(2); MARINE; IMPACTS; CALCIFICATION; TEMPERATURE; RESPONSES
Abstract Ocean Acidification (OA) can have pervasive effects in calcifying marine organisms, and a better understanding of how different populations respond at the physiological and evolutionary level could help to model the impacts of global change in marine ecosystems. Due to its natural geography and oceanographic processes, the Chilean coast provides a natural laboratory where benthic organisms are frequently exposed to diverse projected OA scenarios. The goal of this study was to assess whether a population of mollusks thriving in a more variable environment (Talcaruca) would present higher phenotypic plasticity in physiological and morphological traits in response to different pCO(2) when compared to a population of the same species from a more stable environment (Los Molles). To achieve this, two benthic limpets (Scurria zebrina and Scurria viridula) inhabiting these two contrasting localities were exposed to ocean acidification experimental conditions representing the current pCO(2) in the Chilean coast (500 mu atm) and the levels predicted for the year 2100 in upwelling zones (1500 (mu atm). Our results show that the responses to OA are species-specific, even in this related species. Interestingly, S. viridula showed better performance under OA than S. zebrina (i.e., similar sizes and carbonate content in individuals from both populations; lower effects of acidification on the growth rate combined with a reduction of metabolism at higher pCO2). Remarkably, these characteristics could explain this species' success in overstepping the biogeographical break in the area of Talcaruca, which S. zebrina cannot achieve. Besides, the results show that the habitat factor has a strong influence on some traits. For instance, individuals from Talcaruca presented a higher growth rate plasticity index and lower shell dissolution rates in acidified conditions than those from Los Molles. These results show that limpets from the variable environment tend to display higher plasticity, buffering the physiological effects of OA compared with limpets from the more stable environment. Taken together, these findings highlight the key role of geographic variation in phenotypic plasticity to determine the vulnerability of calcifying organisms to future scenarios of OA.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2296-7745 ISBN Medium
Area Expedition Conference
Notes WOS:000651384500001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1383
Permanent link to this record
 

 
Author Vera, R.; Valverde, B.; Olave, E.; Diaz-Gomez, A.; Sanchez-Gonzalez, R.; Munoz, L.; Martinez, C.; Rojas, P.
Title Corrosion Behavior of Copper Exposed in Marine Tropical Atmosphere in Rapa Nui (Easter Island) Chile 20 Years after MICAT Type
Year 2022 Publication Metals Abbreviated Journal Metals
Volume 12 Issue 12 Pages 2082
Keywords atmospheric corrosion; marine environments; Easter Island (Rapa Nui); corrosion maps; corrosion of copper; climate change
Abstract Atmospheric corrosion of copper, exposed on a tropical island in the South-Central Pacific Ocean, was reported and compared with those of a very similar study at the same site conducted 20 years earlier. The new measurements-taken over three years of exposure, from 2010 to 2013-quantified corrosion by mass loss, characterized corrosion products by X-ray diffraction (DRX) and Raman techniques, observed the attack morphology by Scanning Electron Microscope (SEM), and evaluated the patina resistance using electrochemical techniques. The results showed a copper corrosivity category of C4, and the main copper patina compound, cuprite, was porous, nonhomogeneous, and thin. Electrochemical measurements showed cuprite layer growth as a function of the exposure time, and the morphology did not favor corrosion protection. Finally, when comparing the results to those of a study 22 years previous, the copper corrosion rates increased only slightly, even with increased contaminants associated with growing local populations and continuous tourism on the island.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2075-4701 ISBN Medium
Area Expedition Conference
Notes WOS:000904343700001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1713
Permanent link to this record
 

 
Author Vera, R.; Valverde, B.; Olave, E.; Sanchez, R.; Diaz-Gomez, A.; Munoz, L.; Rojas, P.
Title Atmospheric corrosion and impact toughness of steels: Case study in steels with and without galvanizing, exposed for 3 years in Rapa Nui Island Type
Year 2023 Publication Heliyon Abbreviated Journal Heliyon
Volume 9 Issue 7 Pages e17811
Keywords atmospheric corrosion; Mild steel; Galvanized steel; Impact toughness; Marine environment
Abstract We studied atmospheric corrosion on Rapa Nui Island, using galvanized and non-galvanized SAE 1020 steel samples exposed on racks. We also added Charpy samples of both materials to directly determine the effect of corrosion rate on these materials' impact toughness. The results indicated a correlation between corrosion rate and toughness loss in the studied materials. In the corrosion study, we could also demonstrate the effect from increased insular population growth on con-taminants which aid atmospheric corrosivity. Results showed that atmospheric SO2 has tripled compared with similar corrosion studies done 20 years ago (Mapa Iberoamericano de Corrosi & PRIME;on, MICAT), increasing corrosion rates. Our results show how human factors can influence changes in environmental variables that strengthen corrosion.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2405-8440 ISBN Medium
Area Expedition Conference
Notes WOS:001048711600001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1859
Permanent link to this record