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Ján Viňáš, Marek Vrabeľ, Miroslav Greš, Jakub Brezina, Dušan Sabadka, Gabriel Fedorko, Vieroslav Molnár
This article examined the possibility of using CuSn6P claddings in sliding bearing renovation of movable pontoon bridge props. The bronze layer was welded on cylinders of the high-strength steel S355J0WP EN 10155-93, in an inert atmosphere using an automated welding method (gas tungsten arc welding). Pulsed arc welding was used to minimize the effects of heat on the cladding area, while also accounting for the differences in the physical properties of the joined metals. The sliding bearing was created in two layers...
March 21, 2018: Materials
Cesar Megina, Manuel M González-Duarte, Pablo J López-González
Fouling communities on artificial marine structures are generally different from benthic communities in natural rocky habitats. However, they may also differ among different types of artificial structures. Two artificial structures in direct contact with arriving vessels were compared: floating pontoons within recreational marinas, and sea-walls within commercial harbours. Natural rocky habitats were used as a reference, and the genus Eudendrium (Cnidaria, Hydrozoa) was chosen as a bioindicator. The assemblages were different among the three types of habitat studied, with different species characterising each habitat...
2016: Biofouling
Boris Jovanović, Gizem Bezirci, Ali Serhan Çağan, Jan Coppens, Eti E Levi, Zehra Oluz, Eylül Tuncel, Hatice Duran, Meryem Beklioğlu
Over the course of 78 days, nine outdoor mesocosms, each with 1350 L capacity, were situated on a pontoon platform in the middle of a lake and exposed to 0 μg L(-1) TiO2, 25 μg L(-1) TiO2 or 250 μg L(-1) TiO2 nanoparticles in the form of E171 TiO2 human food additive five times a week. Mesocosms were inoculated with sediment, phytoplankton, zooplankton, macroinvertebrates, macrophytes and fish before exposure, ensuring a complete food web. Physicochemical parameters of the water, nutrient concentrations, and biomass of the taxa were monitored...
September 2016: Nanotoxicology
Erin P Riley, Tiffany W Wade
The study of primates living in novel environments represents an interesting context in which to examine patterns of behavioral and ecological flexibility. Our research focused on an understudied, anthropogenically introduced primate population living in Florida, USA: the Silver River rhesus macaques (Macaca mulatta). To better understand how this population has adapted to life in Florida's riparian woodlands, we collected data on the diet and size of the rhesus macaque population and its encounters with boaters along the Silver River from January to May 2013...
April 2016: Primates; Journal of Primatology
Javier Atalah, Emma M Newcombe, Grant A Hopkins, Barrie M Forrest
The accumulation of biofouling on coastal structures can lead to operational impacts and may harbour problematic organisms, including non-indigenous species. Benthic predators and grazers that can supress biofouling, and which are able to be artificially enhanced, have potential value as augmentative biocontrol agents. The ability of New Zealand native invertebrates to control biofouling on marina pontoons and wharf piles was tested. Caging experiments evaluated the ability of biocontrol to mitigate established biofouling, and to prevent fouling accumulation on defouled surfaces...
September 2014: Biofouling
Annie Sneed
No abstract text is available yet for this article.
May 2014: Scientific American
Gregory Shaw, Anu Koivisto, David Gerrard, Louise M Burke
Open-water swimming (OWS) is a rapidly developing discipline. Events of 5-25 km are featured at FINA World Championships, and the international circuit includes races of 5-88 km. The Olympic OWS event, introduced in 2008, is contested over 10 km. Differing venues present changing environmental conditions, including water and ambient temperatures, humidity, solar radiation, and unpredictable tides. Furthermore, the duration of most OWS events (1-6 hr) creates unique physiological challenges to thermoregulation, hydration status, and muscle fuel stores...
August 2014: International Journal of Sport Nutrition and Exercise Metabolism
M R McLaughlin, J P Brooks, A Adeli
A sampler was needed for a spatial and temporal study of microbial and chemical stratification in a large swine manure lagoon that was known to contain zoonotic bacteria. Conventional samplers were limited to collections of surface water samples near the bank or required a manned boat. A new sampler was developed to allow simultaneous collection of multiple samples at different depths, up to 2.3 m, without a manned boat. The sampler was tethered for stability, used remote control (RC) for sample collection, and accommodated rapid replacement of sterile tubing modules and sample containers...
July 2014: Environmental Monitoring and Assessment
Peng Yao, Hong-Zhen Yin, Qing-Zhen Yao, Hong-Tao Chen, Yue-Liang Liu
Abstract: Surface soil samples from the Yellow River Estuary Wetlands were analyzed for total organic carbon (TOC) and n-alkanes. Molecular indicators of n-alkanes were calculated and their potential as organic matter source indicators was discussed and compared among different sampling areas and times. C25-C33 n-alkanes with odd-to-even predominance were observed in most surface soils of the wetlands, suggesting the dominant contribution of terrestrial higher plants for the soil organic matter (SOM), and the ubiquitous presence of unresolved complex mixture indicated the presence of petroleum contamination...
October 2012: Huan Jing Ke Xue= Huanjing Kexue
Dan Minchin
A rapid assessment, using the abundance and distribution range method, was used to evaluate the status of a large branching bryozoan, Zoobotryon verticillatum attached to the immersed part of marina pontoons in the Canary Islands. Colonies were also found attached to the hulls of leisure craft berthed alongside pontoons at three marinas in Lanzarote during 2012. Low levels of abundance and distribution of the bryozoan occurred in marinas with a freshwater influence whereas in a sheltered marina lacking direct freshwater inputs colonies occurred at ∼2 per metre of combined pontoon length...
October 2012: Marine Pollution Bulletin
L R Goodes, S P Dennington, H Schuppe, J A Wharton, M Bakker, J W Klijnstra, K R Stokes
A test matrix of antifouling (AF) coatings including pMMA, an erodible binder and a novel trityl copolymer incorporating Cu₂O and a furan derivative (FD) natural product, were subjected to pontoon immersion and accelerated rotor tests. Fluorescence and optical microscopy techniques were applied to these coatings for quantification of organic biocide and pigment distribution. Total leaching of the biocide from the novel copolymer binder was observed within 6 months of rotor immersion, compared to 35% from the pMMA coating...
2012: Biofouling
John C Sullivan, Billy Buckner, David C Pigott
BACKGROUND: Boating is a common recreational activity that may subject its participants to specific patterns of injury. OBJECTIVES: We describe two unrelated cases of fifth-finger amputation associated with a specific pontoon boat guardrail design. CASE REPORT: The individuals in these cases sustained an avulsion-type amputation injury to the fifth finger when their fingers became entrapped in a narrowed portion of the boat railing before jumping into the water...
December 2012: Journal of Emergency Medicine
N T Kirchhoff, T D'Antignana, M J Leef, C J Hayward, R J Wilkinson, B F Nowak
Ranched southern bluefin tuna Thunnus maccoyii were fed baitfishes supplemented with vitamins (predominantly E and C) or vitamins and immunostimulants, nucleotides and β-glucans, over 12 weeks after transfer and monitored for enhancement in immune response, health and performance through their 19 week grow-out period. Fish from two different tows were sampled separately at three different sampling points: at transfer to grow-out pontoons, at 8 weeks post-transfer and at harvest, 19 weeks post-transfer. Lysozyme activity was enhanced during vitamin supplementation compared to control fish...
August 2011: Journal of Fish Biology
Vernon A Squire
Current and emergent advances are examined on the topic of hydroelasticity theory applied to natural sea ice responding to the action of ocean surface waves and swell, with attention focused on methods that portray sea ice more faithfully as opposed to those that oversimplify interactions with a poor imitation of reality. A succession of authors have confronted and solved by various means the demanding applied mathematics associated with ocean waves (i) entering a vast sea-ice plate, (ii) travelling between plates of different thickness, (iii) impinging on a pressure ridge, (iv) affecting a single ice floe with arbitrarily specified physical and material properties, and (v) many such features or mixtures thereof...
July 28, 2011: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
Thomas H Cribb, Robert D Adlard, Craig J Hayward, Nathan J Bott, David Ellis, Daryl Evans, Barbara F Nowak
Aporocotylids (fish blood flukes) are emerging as pathogens of fishes in both marine and freshwater aquaculture. Efforts to control these parasites are hampered by a lack of life cycle information. Here we report on the life cycle of Cardicola forsteri, which is considered a significant pathogen in southern bluefin tuna, Thunnus maccoyi, ranched in South Australia. We surveyed polychaetes, bivalves and gastropods from sites close to tuna pontoons. Infections consistent with the Aporocotylidae were found in terebellid polychaetes, a single Longicarpus modestus and five individuals of Reterebella aloba...
July 2011: International Journal for Parasitology
M M Dennis, M Landos, T D'Antignana
Cardicola forsteri is a blood fluke that is highly prevalent among cultured southern bluefin tuna (SBT), Thunnus maccoyii, in South Australia. The role of C forsteri in annual SBT mortality outbreaks, which peak 6 to 12 weeks poststocking, is unknown. The objective of this study was to identify lesions unique to cultured SBT that died during a mortality event in 2009 and to determine the significance of C forsteri-associated lesions. Cultured SBT were sampled from 4 pontoons of a single site in Spencer Gulf that experienced a mortality epidemic that spanned 5 to 14 weeks poststocking...
July 2011: Veterinary Pathology
Craig J Hayward, David Ellis, Danielle Foote, Ryan J Wilkinson, Phillip B B Crosbie, Nathan J Bott, Barbara F Nowak
Peaks in epizootics of sea lice (mostly Caligus chiastos) and blood flukes (Cardicola forsteri) among Southern Bluefin tuna (Thunnus maccoyii) appear to coincide with the onset of an increased mortality. The mortality event occurs 6-12 weeks after T. maccoyii have been transferred into static ranching pontoons from the wild. However, to date available data on parasite occurrence before commercial harvesting begins, are scant. This research gathered epizootiological data from weeks 4 to 13 post-transfer, for 153 T...
October 11, 2010: Veterinary Parasitology
N Balkis, E Müftüoğlu, A Aksu, H I Sur, R Apak
The input of industrial and domestic waste to the horizontal circulation in the Golden Horn Estuary of Marmara Sea has resulted in one of the most polluted estuaries in the past. Consequently, the dissolved oxygen concentrations in both the surface and bottom waters decreased toward to the estuary head during 1998-2005. In contrast, the total suspended solids content of the surface water decreased toward to the estuary mouth. However, construction of the operational collector system surrounding the estuary during the process of rehabilitation projects, combined with the opening of the middle pontoons of the Valide Sultan Bridge, resulted in gradually improved water quality of the estuary with a concomitant decrease in pollution...
May 2010: Environmental Monitoring and Assessment
K A Dafforn, E L Johnston, T M Glasby
Global increases in urban development have resulted in severe habitat modification in many estuaries. Most are now dominated by artificial structures, which might have a myriad of effects on native species. The provision of extra hard substrata presents additional free space, and recent research suggests non-indigenous epifauna may be able to exploit these artificial structures (particularly pontoons) more effectively than native species. The early development of fouling assemblages was compared on settlement plates attached to fixed or moving experimental structures at depths of 0...
2009: Biofouling
B G Clynick
In the marine environment, artificial structures are not, in general, managed for their value as habitat and are often built with no a priori expectation as to the assemblages which may colonise them. It may, however, become increasingly important to consider the value of such structures as habitat when decisions are made with respect to the management of artificial structures. This study investigates the role marinas play as habitat for fish by examining the distribution of fish associated with these urban developments and how this distribution relates to the physical characteristics of marinas...
February 2008: Marine Environmental Research
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