keyword
https://read.qxmd.com/read/33075970/granular-scaling-laws-for-helically-driven-dynamics
#21
JOURNAL ARTICLE
Andrew Thoesen, Teresa McBryan, Darwin Mick, Marko Green, Justin Martia, Hamid Marvi
Exploration of granular physics for three-dimensional geometries interacting with deformable media is crucial for further understanding of granular mechanics and vehicle-terrain dynamics. A modular screw propelled vehicle is, therefore, designed for testing the accuracy of a novel helical granular scaling law in predicting vehicle translational velocity and power. A dimensional analysis is performed on the vehicle and screw pontoons. Two additional pontoon pairs of increased size and mass are determined from dimensional scalars...
September 2020: Physical Review. E
https://read.qxmd.com/read/32983024/the-southern-bluefin-tuna-mucosal-microbiome-is-influenced-by-husbandry-method-net-pen-location-and-anti-parasite-treatment
#22
JOURNAL ARTICLE
Jeremiah J Minich, Cecilia Power, Michaela Melanson, Rob Knight, Claire Webber, Kirsten Rough, Nathan J Bott, Barbara Nowak, Eric E Allen
Aquaculture is the fastest growing primary industry worldwide. Marine finfish culture in open ocean net pens, or pontoons, is one of the largest growth areas and is currently the only way to rear high value fish such as bluefin tuna. Ranching involves catching wild juveniles, stocking in floating net pens and fattening for 4 to 8 months. Tuna experience several parasite-induced disease challenges in culture that can be mitigated by application of praziquantel (PZQ) as a therapeutic. In this study, we characterized the microbiome of ranched southern Bluefin Tuna, Thunnus maccoyii , across four anatomic sites (gill, skin, digesta, and anterior kidney) and evaluated environmental and pathological factors that influence microbiome composition, including the impact of PZQ treatment on microbiome stability...
2020: Frontiers in Microbiology
https://read.qxmd.com/read/32898655/relationship-between-southern-bluefin-tuna-thunnus-maccoyii-melanomacrophage-centres-and-cardicola-spp-trematoda-aporocotylidae-infection
#23
JOURNAL ARTICLE
Maree Widdicombe, Cecilia Power, Rebecca Van Gelderen, Barbara F Nowak, Nathan J Bott
Southern Bluefin Tuna (SBT), Thunnus maccoyii, is ranched off Port Lincoln, South Australia and is Australia's second largest economic finfish aquaculture industry. The biggest threats to SBT health identified by the industry are the blood flukes Cardicola forsteri and C. orientalis (Trematoda: Aporocotylidae). Melanomacrophage centres (MMCs) are aggregations of pigmented macrophage like cells present in spleen, kidney and liver of teleost fish. The aim of this study was to quantify MMCs in SBT anterior kidney, liver and spleen to investigate changes in relation to Cardicola spp...
September 5, 2020: Fish & Shellfish Immunology
https://read.qxmd.com/read/32054036/hydroacoustic-system-in-a-biomimetic-underwater-vehicle-to-avoid-collision-with-vessels-with-low-speed-propellers-in-a-controlled-environment
#24
JOURNAL ARTICLE
Pawel Piskur, Piotr Szymak, Krzysztof Jaskólski, Leszek Flis, Marek Gąsiorowski
In this paper, a hydroacoustic system designed for a biomimetic underwater vehicle (BUV) is presented. The Biomimetic Underwater Vehicle No. 2 (BUV2) is a next-generation BUV built within the ambit of SABUVIS, a European Defense Agency project (category B). Our main efforts were devoted to designing the system so that it will avoid collisions with vessels with low-speed propellers, e.g., submarines. Verification measurements were taken in a lake using a propeller-driven pontoon with a spectrum similar to that produced by a submarine propulsion system...
February 11, 2020: Sensors
https://read.qxmd.com/read/31217462/identifying-niche-and-fitness-dissimilarities-in-invaded-marine-macroalgal-canopies-within-the-context-of-contemporary-coexistence-theory
#25
JOURNAL ARTICLE
Graham Epstein, Stephen J Hawkins, Dan A Smale
Contemporary coexistence theory provides a framework for predicting invasiveness and impact of Invasive Non-Native Species (INNS) by incorporating differences in niche and fitness between INNS and co-occurring native species. The widespread invasive kelp Undaria pinnatifida is considered a high-risk INNS, although a robust evidence base regarding its invasiveness and impact is lacking in many regions. Invaded macroalgal canopies at nine coastal sites in the southwest UK were studied over three years to discern whether Undaria is coexisting or competing with native canopy-forming species across different habitat types...
June 19, 2019: Scientific Reports
https://read.qxmd.com/read/30560004/assessment-of-the-effect-of-remediation-strategies-on-the-environmental-quality-of-aquaculture-ponds-in-marilao-and-meycauayan-bulacan-philippines
#26
JOURNAL ARTICLE
John Vincent R Pleto, Mark Dondi M Arboleda, Jessica F Simbahan, Veronica P Migo
Background: Water quality in the Marilao-Meycauayan-Obando river system (MMORS) of Bulacan, the Philippines, is of great concern due to the pollution load from local industries. The river system is currently used as a source of water for the aquaculture industry in Bulacan. Objectives: In order to address organic and heavy metal pollution, several remediation strategies were tested in aquaculture ponds along the river system. Strategies such as phytoremediation (vetiver grass pontoons), application of probiotics and zeolite (with filtration as pre-treatment) were utilized in ponds to decrease or remove toxic pollutants in water and sediments...
December 2018: Journal of Health & Pollution
https://read.qxmd.com/read/30503460/between-habitat-variability-in-the-population-dynamics-of-a-global-marine-invader-may-drive-management-uncertainty
#27
JOURNAL ARTICLE
Graham Epstein, Dan A Smale
Understanding population dynamics of established invasive species is important for designing effective management measures and predicting factors such as invasiveness and ecological impact. The kelp Undaria pinnatifida has spread to most temperate regions of the world, however a basic understanding of population dynamics is lacking for many regions. Here, Undaria was monitored for 2 years, at 9 sites, across 3 habitats to investigate habitat-related variation in population structure, reproductive capacity and morphology...
December 2018: Marine Pollution Bulletin
https://read.qxmd.com/read/30048493/pontoon-trap-for-salmon-and-trout-equipped-with-a-seal-exclusion-device-catches-larger-salmons
#28
JOURNAL ARTICLE
Linda Calamnius, Mikael Lundin, Arne Fjälling, Sara Königson
The growing seal populations of the Baltic have led to more frequent interactions with coastal fisheries. The motivation for seals to interact with fishing gear is high. It provides high densities of fish. A successful means of mitigating the conflict is the pontoon trap. Seal visits here have been frequent. Seals have access to most parts of the trap system including the middle chamber, which is an overhead environment. Concerns have been raised about seals possible entanglement in this specific part of the trap...
2018: PloS One
https://read.qxmd.com/read/29983191/removal-treatments-alter-the-recruitment-dynamics-of-a-global-marine-invader-implications-for-management-feasibility
#29
JOURNAL ARTICLE
Graham Epstein, Stephen J Hawkins, Dan A Smale
Frameworks designed to prioritise the management of invasive non-native species (INNS) must consider many factors, including their impacts on native biodiversity, ecosystem services, and human health. Management feasibility should also be foremost in any prioritisation process, but is often overlooked, particularly in the marine environment. The Asian kelp, Undaria pinnatifida, is one of the most cosmopolitan marine INNS worldwide and recognised as a priority species for monitoring in the UK and elsewhere. Here, experimental monthly removals of Undaria (from 0...
July 6, 2018: Marine Environmental Research
https://read.qxmd.com/read/29561762/restoration-of-worn-movable-bridge-props-with-use-of-bronze-claddings
#30
JOURNAL ARTICLE
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
https://read.qxmd.com/read/26960078/benthic-assemblages-biodiversity-and-invasiveness-in-marinas-and-commercial-harbours-an-investigation-using-a-bioindicator-group
#31
COMPARATIVE STUDY
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
https://read.qxmd.com/read/26901391/food-web-effects-of-titanium-dioxide-nanoparticles-in-an-outdoor-freshwater-mesocosm-experiment
#32
JOURNAL ARTICLE
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
https://read.qxmd.com/read/26874521/adapting-to-florida-s-riverine-woodlands-the-population-status-and-feeding-ecology-of-the-silver-river-rhesus-macaques-and-their-interface-with-humans
#33
JOURNAL ARTICLE
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
https://read.qxmd.com/read/25287610/potential-biocontrol-agents-for-biofouling-on-artificial-structures
#34
JOURNAL ARTICLE
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
https://read.qxmd.com/read/24783584/a-pontoon-of-pupae
#35
JOURNAL ARTICLE
Annie Sneed
No abstract text is available yet for this article.
May 2014: Scientific American
https://read.qxmd.com/read/24667305/nutrition-considerations-for-open-water-swimming
#36
REVIEW
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
https://read.qxmd.com/read/24549945/a-new-sampler-for-stratified-lagoon-chemical-and-microbiological-assessments
#37
JOURNAL ARTICLE
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
https://read.qxmd.com/read/23233973/-composition-of-n-alkanes-in-soils-of-the-yellow-river-estuary-wetlands-and-their-potential-as-organic-matter-source-indicators
#38
JOURNAL ARTICLE
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
https://read.qxmd.com/read/22920716/rapid-assessment-of-the-bryozoan-zoobotryon-verticillatum-delle-chiaje-1822-in-marinas-canary-islands
#39
JOURNAL ARTICLE
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
https://read.qxmd.com/read/22715934/fluorescence-microscopy-techniques-for-quantitative-evaluation-of-organic-biocide-distribution-in-antifouling-paint-coatings-application-to-model-antifouling-coatings
#40
JOURNAL ARTICLE
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
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