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https://www.readbyqxmd.com/read/28915379/study-on-the-oxygen-reduction-reaction-catalyzed-by-a-cold-tolerant-marine-strain-phylogenetically-related-to-erythrobacter-citreus
#1
Lianqiang Li, Fei Ding, Lin Sang, Jiaquan Liu, Duolu Mao, Xingjiang Liu, Qiang Xu
As the development of marine economy, the submarine battery with the seawater electrolyte has obtained more and more attentions. Owing to the conventional electrochemical catalysts of the cathodes in seawater battery are expensive, it is to seek the new biological catalysts to improve the electrochemical performance of the cathode and reduce the cost of seawater battery. A novel marine bacterial strain (Strain SQ-32) phylogenetically related to the Erythrobactercitreus strain has been isolated from the sea-bed sludge in the Yellow Sea of China successfully...
September 8, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28903858/submarine-canyons-along-the-upper-sardinian-slope-central-western-mediterranean-as-repositories-for-derelict-fishing-gears
#2
Alessandro Cau, Andrea Alvito, Davide Moccia, Simonepietro Canese, Antonio Pusceddu, Cannas Rita, Michela Angiolillo, Maria C Follesa
By means of ROV surveys, we assessed the quantity, composition and bathymetric distribution of marine litter in 17 sites along the Sardinian continental margin (Central Western Mediterranean) at depths ranging from 100 to 480m. None of the investigated sites was litter free, but the mean density of litter (0.0175±0.0022itemsm(-2)) was lower than that reported from other Tyrrhenian regions. The difference in the total litter density among sites was negligible, but the density of derelict fishing gear (DFG) items (most of which ascribable to small scale fishery) in submarine canyons was higher in submarine canyons than in other habitats...
September 11, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28890454/the-telegraph-and-the-control-of-material-movements-a-micro-study-about-the-detachment-of-communication-from-transport
#3
Roland Wenzlhuemer
Relatively recent historiographical approaches such as global or transnational history have attracted new attention to telegraphy and its role in processes of globalization. This renewed interest in submarine cables and overland wires has recently provided us with a reasonably good idea of how the global telegraph network developed in the nineteenth century, who its principal designers were, and where it was more and where it was less tight. Little, however, has been said so far about the actual matters communicated telegraphically, certainly not in any systematic fashion...
2017: Technology and Culture
https://www.readbyqxmd.com/read/28868597/decompressing-recompression-chamber-attendants-during-australian-submarine-rescue-operations
#4
Michael P Reid, Andrew Fock, David J Doolette
INTRODUCTION: Inside chamber attendants rescuing survivors from a pressurised, distressed submarine may themselves accumulate a decompression obligation which may exceed the limits of Defense and Civil Institute of Environmental Medicine tables presently used by the Royal Australian Navy. This study assessed the probability of decompression sickness (PDCS) for medical attendants supervising survivors undergoing oxygen-accelerated saturation decompression according to the National Oceanic and Atmospheric Administration (NOAA) 17...
September 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28868596/decompressing-rescue-personnel-during-australian-submarine-rescue-operations
#5
Michael P Reid, Andrew Fock, David J Doolette
INTRODUCTION: Personnel rescuing survivors from a pressurized, distressed Royal Australian Navy (RAN) submarine may themselves accumulate a decompression obligation, which may exceed the bottom time limits of the Defense and Civil Institute of Environmental Medicine (DCIEM) Air and In-Water Oxygen Decompression tables (DCIEM Table 1 and 2) presently used by the RAN. This study compared DCIEM Table 2 with alternative decompression tables with longer bottom times: United States Navy XVALSS_DISSUB 7, VVAL-18M and Royal Navy 14 Modified tables...
September 2017: Diving and Hyperbaric Medicine: the Journal of the South Pacific Underwater Medicine Society
https://www.readbyqxmd.com/read/28865959/amyloid-fibril-aggregation-an-insight-into-the-underwater-adhesion-of-barnacle-cement
#6
Xingping Liu, Chao Liang, Xinkang Zhang, Jianyong Li, Jingyun Huang, Ling Zeng, Zonghuang Ye, Biru Hu, Wenjian Wu
Barnacles robustly adhere themselves to diverse submarine substrates through a proteinaceous complex termed the "barnacle cement". Previous studies have indicated that certain peptides derived from some barnacle cement proteins can self-assemble into amyloid fibrils. In this study, we assessed the self-assembly behavior of a full-length 19 kDa cement protein from Balanus albicostatus (Balcp19k) in different buffers. Results of Thioflavin T binding assay, transmission electron microscopy, and Fourier transform infrared spectroscopy suggested that the bacterial recombinant Balcp19k was able to aggregate into typical amyloid fibrils...
August 30, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28858322/scientists-solve-mystery-of-us-civil-war-submarine
#7
Ben Upton
No abstract text is available yet for this article.
August 23, 2017: Nature
https://www.readbyqxmd.com/read/28855678/millennial-scale-northern-hemisphere-atlantic-pacific-climate-teleconnections-in-the-earliest-middle-pleistocene
#8
Masayuki Hyodo, Balázs Bradák, Makoto Okada, Shigehiro Katoh, Ikuko Kitaba, David L Dettman, Hiroki Hayashi, Koyo Kumazawa, Kotaro Hirose, Osamu Kazaoka, Kizuku Shikoku, Akihisa Kitamura
Suborbital-scale climate variations, possibly caused by solar activity, are observed in the Holocene and last-glacial climates. Recently published bicentennial-resolution paleoceanic environmental records reveal millennial-scale high-amplitude oscillations postdating the last geomagnetic reversal in the Marine Isotope Stage (MIS) 19 interglacial. These oscillations, together with decoupling of post-reversal warming from maximum sea-level highstand in mid-latitudes, are key features for understanding the climate system of MIS 19 and the following Middle Pleistocene...
August 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28853176/optimal-mission-abort-policy-for-systems-operating-in-a-random-environment
#9
Gregory Levitin, Maxim Finkelstein
Many real-world critical systems, e.g., aircrafts, manned space flight systems, and submarines, utilize mission aborts to enhance their survivability. Specifically, a mission can be aborted when a certain malfunction condition is met and a rescue or recovery procedure is then initiated. For systems exposed to external impacts, the malfunctions are often caused by the consequences of these impacts. Traditional system reliability models typically cannot address a possibility of mission aborts. Therefore, in this article, we first develop the corresponding methodology for modeling and evaluation of the mission success probability and survivability of systems experiencing both internal failures and external shocks...
August 29, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28846627/paulomycin-g-a-new-natural-product-with-cytotoxic-activity-against-tumor-cell-lines-produced-by-deep-sea-sediment-derived-micromonospora-matsumotoense-m-412-from-the-avil%C3%A3-s-canyon-in-the-cantabrian-sea
#10
Aida Sarmiento-Vizcaíno, Alfredo F Braña, Ignacio Pérez-Victoria, Jesús Martín, Nuria de Pedro, Mercedes de la Cruz, Caridad Díaz, Francisca Vicente, José L Acuña, Fernando Reyes, Luis A García, Gloria Blanco
The present article describes a structurally novel natural product of the paulomycin family, designated as paulomycin G (1), obtained from the marine strain Micromonospora matsumotoense M-412, isolated from Cantabrian Sea sediments collected at 2000 m depth during an oceanographic expedition to the submarine Avilés Canyon. Paulomycin G is structurally unique since-to our knowledge-it is the first member of the paulomycin family of antibiotics lacking the paulomycose moiety. It is also the smallest bioactive paulomycin reported...
August 28, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28832592/air-blast-injuries-killed-the-crew-of-the-submarine-h-l-hunley
#11
Rachel M Lance, Lucas Stalcup, Brad Wojtylak, Cameron R Bass
The submarine H.L. Hunley was the first submarine to sink an enemy ship during combat; however, the cause of its sinking has been a mystery for over 150 years. The Hunley set off a 61.2 kg (135 lb) black powder torpedo at a distance less than 5 m (16 ft) off its bow. Scaled experiments were performed that measured black powder and shock tube explosions underwater and propagation of blasts through a model ship hull. This propagation data was used in combination with archival experimental data to evaluate the risk to the crew from their own torpedo...
2017: PloS One
https://www.readbyqxmd.com/read/28822315/applications-of-radon-and-radium-isotopes-to-determine-submarine-groundwater-discharge-and-flushing-times-in-todos-os-santos-bay-brazil
#12
Vanessa Hatje, Karina Kammer Attisano, Marcelo Friederichs Landim de Souza, Barbara Mazzilli, Joselene de Oliveira, Tamires de Araújo Mora, William C Burnett
Todos os Santos Bay (BTS) is the 2nd largest bay in Brazil and an important resource for the people of the State of Bahia. We made measurements of radon and radium in selected areas of the bay to evaluate if these tracers could provide estimates of submarine groundwater discharge (SGD) and flushing times of the Paraguaçu Estuary and BTS. We found that there were a few areas along the eastern and northeastern shorelines that displayed relatively high radon and low salinities, indicating possible sites of enhanced SGD...
August 16, 2017: Journal of Environmental Radioactivity
https://www.readbyqxmd.com/read/28812648/fungus-like-mycelial-fossils-in-2-4-billion-year-old-vesicular-basalt
#13
Stefan Bengtson, Birger Rasmussen, Magnus Ivarsson, Janet Muhling, Curt Broman, Federica Marone, Marco Stampanoni, Andrey Bekker
Fungi have recently been found to comprise a significant part of the deep biosphere in oceanic sediments and crustal rocks. Fossils occupying fractures and pores in Phanerozoic volcanics indicate that this habitat is at least 400 million years old, but its origin may be considerably older. A 2.4-billion-year-old basalt from the Palaeoproterozoic Ongeluk Formation in South Africa contains filamentous fossils in vesicles and fractures. The filaments form mycelium-like structures growing from a basal film attached to the internal rock surfaces...
April 24, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812647/corrigendum-a-submarine-volcanic-eruption-leads-to-a-novel-microbial-habitat
#14
Roberto Danovaro, Miquel Canals, Michael Tangherlini, Antonio Dell'Anno, Cristina Gambi, Galderic Lastras, David Amblas, Anna Sanchez-Vidal, Jaime Frigola, Antoni M Calafat, Rut Pedrosa-Pàmies, Jesus Rivera, Xavier Rayo, Cinzia Corinaldesi
This corrects the article DOI: 10.1038/s41559-017-0144.
May 22, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28812643/a-submarine-volcanic-eruption-leads-to-a-novel-microbial-habitat
#15
Roberto Danovaro, Miquel Canals, Michael Tangherlini, Antonio Dell'Anno, Cristina Gambi, Galderic Lastras, David Amblas, Anna Sanchez-Vidal, Jaime Frigola, Antoni M Calafat, Rut Pedrosa-Pàmies, Jesus Rivera, Xavier Rayo, Cinzia Corinaldesi
Submarine volcanic eruptions are major catastrophic events that allow investigation of the colonization mechanisms of newly formed seabed. We explored the seafloor after the eruption of the Tagoro submarine volcano off El Hierro Island, Canary Archipelago. Near the summit of the volcanic cone, at about 130 m depth, we found massive mats of long, white filaments that we named Venus's hair. Microscopic and molecular analyses revealed that these filaments are made of bacterial trichomes enveloped within a sheath and colonized by epibiotic bacteria...
April 24, 2017: Nature ecology & evolution
https://www.readbyqxmd.com/read/28810955/embedded-mental-health-promotion-of-psychological-hygiene-within-a-submarine-squadron
#16
James Rapley, John Chin, Brian McCue, Mathew Rariden
INTRODUCTION: Psychological fitness is an important component to operational unit readiness and success. Embedding behavioral health providers can reduce unplanned personnel losses (UPL) as a result of psychological stress. The U.S. Submarine Forces implemented the Submarine Squadron 6 (CSS-6) Embedded Mental Health Pilot (EMHP) Program to address this type of UPL, which is classified as a Code 2 loss. The aim of the study is to evaluate the effectiveness of the EMHP Program at reducing UPL by improving psychological readiness through expedited access to care...
July 2017: Military Medicine
https://www.readbyqxmd.com/read/28801585/inputs-of-humic-fluorescent-dissolved-organic-matter-via-submarine-groundwater-discharge-to-coastal-waters-off-a-volcanic-island-jeju-korea
#17
Jeonghyun Kim, Guebuem Kim
The abundance of fluorescent dissolved organic matter (FDOM) in the surface ocean plays a critical role in the growth of marine microorganisms and corals by affecting the optical properties (i.e., the penetration of UV radiation) of seawater. In general, it is known that rivers are the main source of FDOM to surface ocean waters. Here, however, we show that the concentrations of FDOM in coastal seawater off a volcanic island, Jeju, Korea, are dependent primarily on submarine groundwater discharge (SGD). Based on a significant correlation between (222)Rn and salinity in seawater, fresh groundwater was found to be the main source of groundwater as well as fresh water in the bay...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28782035/fairy-circle-landscapes-under-the-sea
#18
Daniel Ruiz-Reynés, Damià Gomila, Tomàs Sintes, Emilio Hernández-García, Núria Marbà, Carlos M Duarte
Short-scale interactions yield large-scale vegetation patterns that, in turn, shape ecosystem function across landscapes. Fairy circles, which are circular patches bare of vegetation within otherwise continuous landscapes, are characteristic features of semiarid grasslands. We report the occurrence of submarine fairy circle seascapes in seagrass meadows and propose a simple model that reproduces the diversity of seascapes observed in these ecosystems as emerging from plant interactions within the meadow. These seascapes include two extreme cases, a continuous meadow and a bare landscape, along with intermediate states that range from the occurrence of persistent but isolated fairy circles, or solitons, to seascapes with multiple fairy circles, banded vegetation, and "leopard skin" patterns consisting of bare seascapes dotted with plant patches...
August 2017: Science Advances
https://www.readbyqxmd.com/read/28740250/green-tide-development-associated-with-submarine-groundwater-discharge-in-a-coastal-harbor-jeju-korea
#19
Hyeong Kyu Kwon, Hyekyung Kang, Yong Hwa Oh, Sang Rul Park, Guebuem Kim
We measured the magnitude of submarine fresh groundwater discharge (SFGD) and associated nutrient inputs to Jocheon harbor, on Jeju Island, Korea, during four sampling periods, in order to determine the link between SFGD and Ulva sp. green tide development. Good correlations among salinity, (222)Rn, and dissolved inorganic nitrogen (DIN) in harbor seawater suggest that SFGD is the major source of DIN and fresh water since there are no surface runoffs. Using a (222)Rn mass balance model, SFGD to the harbor was estimated to be 5...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28727932/laboratory-studies-of-methane-and-its-relationship-to-prebiotic-chemistry
#20
Kensei Kobayashi, Wolf D Geppert, Nathalie Carrasco, Nils G Holm, Olivier Mousis, Maria Elisabetta Palumbo, J Hunter Waite, Naoki Watanabe, Lucy M Ziurys
To examine how prebiotic chemical evolution took place on Earth prior to the emergence of life, laboratory experiments have been conducted since the 1950s. Methane has been one of the key molecules in these investigations. In earlier studies, strongly reducing gas mixtures containing methane and ammonia were used to simulate possible reactions in the primitive atmosphere of Earth, producing amino acids and other organic compounds. Since Earth's early atmosphere is now considered to be less reducing, the contribution of extraterrestrial organics to chemical evolution has taken on an important role...
August 2017: Astrobiology
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