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https://www.readbyqxmd.com/read/29043109/multigene-phylogeny-of-the-scyphozoan-jellyfish-family-pelagiidae-reveals-that-the-common-u-s-atlantic-sea-nettle-comprises-two-distinct-species-chrysaora-quinquecirrha-and-c-chesapeakei
#1
Keith M Bayha, Allen G Collins, Patrick M Gaffney
BACKGROUND: Species of the scyphozoan family Pelagiidae (e.g., Pelagia noctiluca, Chrysaora quinquecirrha) are well-known for impacting fisheries, aquaculture, and tourism, especially for the painful sting they can inflict on swimmers. However, historical taxonomic uncertainty at the genus (e.g., new genus Mawia) and species levels hinders progress in studying their biology and evolutionary adaptations that make them nuisance species, as well as ability to understand and/or mitigate their ecological and economic impacts...
2017: PeerJ
https://www.readbyqxmd.com/read/29037949/antibacterial-activities-of-viriditoxin-congeners-and-synthetic-analogues-against-fish-pathogens
#2
Tae Hwan Noh, Liu Sen, Jongki Hong, Joon-Hee Lee, Hyung Ryong Moon, Jee H Jung
Viriditoxin is a fungal secondary metabolite of the fungus Paecilomyces variotii derived from the inner tissues of the giant jellyfish Nemopilema nomurai. Viriditoxin exhibits antibacterial activity against Streptococcus iniae and Streptococcus parauberis, which are major pathogens of aqua cultured fish. Viriditoxin induced abnormal cell morphologies in the fish pathogens S. iniae and S. parauberis, presumably by inhibiting FtsZ polymerization as was previously observed in Escherichia coli. Synthetic analogues of viriditoxin, designed based on docking simulation results to FtsZ of Staphylococcus aureus, were prepared and compared with viriditoxin for antibacterial activity...
October 9, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29017039/sleep-origins-restful-jellyfish-are-sleeping-jellyfish
#3
John A Lesku, Linh M T Ly
What is the 'simplest' animal that sleeps? When did sleep first evolve? Do all animals sleep? Tantalizing hints to answers come from new research showing that jellyfish, one of the earliest evolving groups of animals, have a sleep-like restful state.
October 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28975784/dual-mode-electronic-skin-with-integrated-tactile-sensing-and-visualized-injury-warning
#4
Yanli Zhang, Yunsheng Fang, Jia Li, Qihao Zhou, Yongjun Xiao, Kui Zhang, Beibei Luo, Jun Zhou, Bin Hu
Mimicking pressure sensing behavior of biological skins using electronic devices has profound implications for prosthetics and medicine. The developed electronic skins based on single response mode for pressure sensing suffer from the rapid decrease in sensitivity with the increase of pressure. Their highly sensitive range covers a narrow part of tolerable pressure range of human skin and have weak response to the injurious high pressures. Herein, inspired by a bioluminescent jellyfish, we develop an electronic skin with dual-mode response characteristic, which is able to quantify and map the static and dynamic pressures by combining electrical and optical responses...
October 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28951742/guided-bone-regeneration-using-collagen-scaffolds-growth-factors-and-periodontal-ligament-stem-cells-for-treatment-of-peri-implant-bone-defects-in-vivo
#5
Peer W Kämmerer, Malte Scholz, Maria Baudisch, Jan Liese, Katharina Wegner, Bernhard Frerich, Hermann Lang
INTRODUCTION: The aim of the study was an evaluation of different approaches for guided bone regeneration (GBR) of peri-implant defects in an in vivo animal model. MATERIALS AND METHODS: In minipigs (n = 15), peri-implant defects around calcium phosphate- (CaP-; n = 46) coated implants were created and randomly filled with (1) blank, (2) collagen/hydroxylapatite/β-tricalcium phosphate scaffold (CHT), (3) CHT + growth factor cocktail (GFC), (4) jellyfish collagen matrix, (5) jellyfish collagen matrix + GFC, (6) collagen powder, and (7) collagen powder + periodontal ligament stem cells (PDLSC)...
2017: Stem Cells International
https://www.readbyqxmd.com/read/28943083/the-jellyfish-cassiopea-exhibits-a-sleep-like-state
#6
Ravi D Nath, Claire N Bedbrook, Michael J Abrams, Ty Basinger, Justin S Bois, David A Prober, Paul W Sternberg, Viviana Gradinaru, Lea Goentoro
Do all animals sleep? Sleep has been observed in many vertebrates, and there is a growing body of evidence for sleep-like states in arthropods and nematodes [1-5]. Here we show that sleep is also present in Cnidaria [6-8], an earlier-branching metazoan lineage. Cnidaria and Ctenophora are the first metazoan phyla to evolve tissue-level organization and differentiated cell types, such as neurons and muscle [9-15]. In Cnidaria, neurons are organized into a non-centralized radially symmetric nerve net [11, 13, 15-17] that nevertheless shares fundamental properties with the vertebrate nervous system: action potentials, synaptic transmission, neuropeptides, and neurotransmitters [15-20]...
October 9, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28930834/allergic-shock-caused-by-ingestion-of-cooked-jellyfish-a-case-report
#7
Zhixing Li, Xungang Tan, Botao Yu, Renliang Zhao
RATIONALE: Although anaphylaxis caused by jellyfish stings is common in coastal areas, an allergic shock caused by cooked jellyfish ingestion has never been reported in China. In this paper, we report a case of allergic shock being caused by ingestion of cooked salt-preserved jellyfish shortly after being stung by a live jellyfish. PATIENT CONCERNS: A 26-year-old Chinese man presented with dizziness, pruritus, dyspnea, hypotension, and tachycardia after eating cooked salted jellyfish...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28910729/tio2-particles-in-seafood-and-surimi-products-attention-should-be-paid-to-their-exposure-and-uptake-through-foods
#8
Chunyang Yin, Weilu Zhao, Rui Liu, Rong Liu, Zhe Wang, Lingyan Zhu, Wei Chen, Sijin Liu
The sustainable development of nanotechnology requires a thorough understanding of the life cycle of synthesized nanomaterials, including environmental release, deposition, exposure, and potential health risks. Titanium dioxide (TiO2) materials containing nanosized TiO2 (nTiO2) are commonly used as food additives. Thus, dietary intake through foods is the most important route for the exposure of TiO2 materials. Given the toxic effects of nTiO2 on the gastrointestinal tract and other tissues, it is imperative to investigate their sources and concentrations in popular foods...
August 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28869962/mimicking-biological-stress-strain-behaviour-with-synthetic-elastomers
#9
Mohammad Vatankhah-Varnosfaderani, William F M Daniel, Matthew H Everhart, Ashish A Pandya, Heyi Liang, Krzysztof Matyjaszewski, Andrey V Dobrynin, Sergei S Sheiko
Despite the versatility of synthetic chemistry, certain combinations of mechanical softness, strength, and toughness can be difficult to achieve in a single material. These combinations are, however, commonplace in biological tissues, and are therefore needed for applications such as medical implants, tissue engineering, soft robotics, and wearable electronics. Present materials synthesis strategies are predominantly Edisonian, involving the empirical mixing of assorted monomers, crosslinking schemes, and occluded swelling agents, but this approach yields limited property control...
September 4, 2017: Nature
https://www.readbyqxmd.com/read/28828853/activation-of-actuating-hydrogels-with-ws2-nanosheets-for-biomimetic-cellular-structures-and-steerable-prompt-deformation
#10
Lu Zong, Xiankai Li, Xiangsheng Han, Lili Lv, Mingjie Li, Jun You, Xiaochen Wu, Chaoxu Li
Macroscopic soft actuation is intrinsic to living organisms in nature, including slow deformation (e.g., contraction, bending, twisting, and curling) of plants motivated by microscopic swelling and shrinking of cells, and rapid motion of animals (e.g., deformation of jellyfish) motivated by cooperative nanoscale movement of motor proteins. These actuation behaviors, with an exceptional combination of tunable speed and programmable deformation direction, inspire us to design artificial soft actuators for broad applications in artificial muscles, nanofabrication, chemical valves, microlenses, soft robotics, etc...
September 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28827642/functional-and-proteomic-analysis-of-ceratonova-shasta-cnidaria-myxozoa-polar-capsules-reveals-adaptations-to-parasitism
#11
Gadi Piriatinskiy, Stephen D Atkinson, Sinwook Park, David Morgenstern, Vera Brekhman, Gilad Yossifon, Jerri L Bartholomew, Tamar Lotan
Myxozoa is a diverse, speciose group of microscopic parasites, recently placed within the phylum Cnidaria. Myxozoans are highly reduced in size and complexity relative to free-living cnidarians, yet they have retained specialized organelles known as polar capsules, akin to the nematocyst stinging capsules of free-living species. Whereas in free-living cnidarians the stinging capsules are used for prey capture or defense, in myxozoans they have the essential function of initiating the host infection process...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28816245/ram-pressure-feeding-of-supermassive-black-holes
#12
Bianca M Poggianti, Yara L Jaffé, Alessia Moretti, Marco Gullieuszik, Mario Radovich, Stephanie Tonnesen, Jacopo Fritz, Daniela Bettoni, Benedetta Vulcani, Giovanni Fasano, Callum Bellhouse, George Hau, Alessandro Omizzolo
When a supermassive black hole at the centre of a galaxy accretes matter, it gives rise to a highly energetic phenomenon: an active galactic nucleus. Numerous physical processes have been proposed to account for the funnelling of gas towards the galactic centre to feed the black hole. There are also several physical processes that can remove gas from a galaxy, one of which is ram-pressure stripping by the hot gas that fills the space between galaxies in galaxy clusters. Here we report that six out of a sample of seven 'jellyfish' galaxies-galaxies with long 'tentacles' of material that extend for dozens of kiloparsecs beyond the galactic disks-host an active nucleus, and two of them also have galactic-scale ionization cones...
August 16, 2017: Nature
https://www.readbyqxmd.com/read/28814953/in-vitro-characterization-of-jellyfish-venom-fibrin-ogen-olytic-enzymes-from-nemopilema-nomurai
#13
Seong Kyeong Bae, Hyunkyoung Lee, Yunwi Heo, Min Jung Pyo, Indu Choudhary, Chang Hoon Han, Won Duk Yoon, Changkeun Kang, Euikyung Kim
BACKGROUND: Because jellyfish are capable of provoking envenomation in humans, they are considered hazardous organisms. Although the effects of their toxins are a matter of concern, information on the venom components, biological activity and pathological mechanisms are still scarce. Therefore, the aim of the present study was to investigate a serine protease component of Nemopilema nomurai jellyfish venom (NnV) and unveil its characteristics. METHODS: To determine the relationship between fibrinolytic activity of NnV and the serine protease, fibrin zymography was performed using metalloprotease and serine protease inhibitors...
2017: Journal of Venomous Animals and Toxins Including Tropical Diseases
https://www.readbyqxmd.com/read/28781190/impingement-of-marine-organisms-in-a-tropical-atomic-power-plant-cooling-water-system
#14
S Barath Kumar, A K Mohanty, N P I Das, K K Satpathy, S K Sarkar
A one-year impingement monitoring was conducted at Madras Atomic Power Station (MAPS), Kalpakkam, southeastern coast of India and identified a total of 67 species of marine organisms in the cooling water system. Estimates of total annual impingement contributed about 1.47×10(6) individuals and 142.5t of biomass. Jellyfish contributed about 6.8×10(5) individuals and 135.6t of biomass. Crabs, shrimps and fish were the most vulnerable organisms contributing about 4.29×10(5) individuals, 1.39×10(5) individuals and 2...
August 3, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28777817/effect-of-tea-saponin-on-ephyrae-and-polyps-of-the-moon-jellyfish-aurelia-sp-1
#15
Zhijun Dong, Tingting Sun, Likun Liang, Lei Wang
The moon jellyfish (Aurelia sp.1) is thought to be a nuisance for the sea cucumber aquaculture, which commonly occur in the sea cucumber (Apostichopus japonicus) culture ponds of the Yellow Sea, China. To develop an appropriate method to control Aurelia sp.1 blooms, the toxic effects of tea saponin on Aurelia sp.1 ephyrae and polyps were tested in laboratory experiments. Our results revealed that tea saponin caused significant morphological changes, behavioral abnormality and mortality in Aurelia sp.1 ephyrae and polyps in 24 h and 48 h exposure experiments...
2017: PloS One
https://www.readbyqxmd.com/read/28746410/environmental-factors-influencing-the-spatio-temporal-distribution-of-carybdea-marsupialis-lineo-1978-cubozoa-in-south-western-mediterranean-coasts
#16
Antonio Canepa, Verónica Fuentes, Mar Bosch-Belmar, Melissa Acevedo, Kilian Toledo-Guedes, Antonio Ortiz, Elia Durá, César Bordehore, Josep-Maria Gili
Jellyfish blooms cause important ecological and socio-economic problems. Among jellyfish, cubozoans are infamous for their painful, sometimes deadly, stings and are a major public concern in tropical to subtropical areas; however, there is little information about the possible causes of their outbreaks. After a bloom of the cubomedusa Carybdea marsupialis (Carybdeidae) along the coast of Denia (SW Mediterranean, Spain) in 2008 with negative consequences for local tourism, the necessity to understand the ecological restrictions on medusae abundance was evident...
2017: PloS One
https://www.readbyqxmd.com/read/28743285/%C3%AE-adrenergic-receptor-camp-pka-signaling-contributes-to-the-intracellular-ca-2-release-by-tentacle-extract-from-the-jellyfish-cyanea-capillata
#17
Qianqian Wang, Hui Zhang, Bo Wang, Chao Wang, Liang Xiao, Liming Zhang
BACKGROUND: Intracellular Ca(2+) overload induced by extracellular Ca(2+) entry has previously been confirmed to be an important mechanism for the cardiotoxicity as well as the acute heart dysfunction induced by jellyfish venom, while the underlying mechanism remains to be elucidated. METHODS: Under extracellular Ca(2+)-free or Ca(2+)-containing conditions, the Ca(2+) fluorescence in isolated adult mouse cardiomyocytes pre-incubated with tentacle extract (TE) from the jellyfish Cyanea capillata and β blockers was scanned by laser scanning confocal microscope...
July 25, 2017: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/28741862/in-vivo-comparison-of-jellyfish-and-bovine-collagen-sponges-as-prototype-medical-devices
#18
Jonathan P Widdowson, Alex J Picton, Valerie Vince, Chris J Wright, Andrew Mearns-Spragg
Jellyfish have emerged as a source of next generation collagen that is an attractive alternative to existing sources, such as bovine and porcine, due to a plentiful supply and providing a safer source through lack of bovine spongiform encephalopathy (BSE) transmission risk and potential viral vectors, both of which could be transmitted to humans. Here we compare collagen implantable sponges derived for the first time from the Rhizostoma pulmo jellyfish. A further novelty for the research was that there was a comparison for sponges that were either uncrosslinked or crosslinked using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC), and an assessment on how this affected resorption, as well as their biocompatibility compared to bovine type I collagen sponges...
July 25, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28734075/high-occurrence-of-jellyfish-predation-by-black-browed-and-campbell-albatross-identified-by-dna-metabarcoding
#19
Julie C McInnes, Rachael Alderman, Mary-Anne Lea, Ben Raymond, Bruce E Deagle, Richard A Phillips, Andrew Stanworth, David R Thompson, Paulo Catry, Henri Weimerskirch, Cristián G Suazo, Michaël Gras, Simon N Jarman
Gelatinous zooplankton are a large component of the animal biomass in all marine environments, but are considered to be uncommon in the diet of most marine top predators. However, the diets of key predator groups like seabirds have conventionally been assessed from stomach content analyses, which cannot detect most gelatinous prey. As marine top predators are used to identify changes in the overall species composition of marine ecosystems, such biases in dietary assessment may impact our detection of important ecosystem regime shifts...
July 22, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28733393/microscopic-observation-of-living-cells-stained-with-fluorescent-probes
#20
Haruhiko Asakawa, Da-Qiao Ding, Tokuko Haraguchi, Yasushi Hiraoka
Fluorescence imaging of living cells provides a unique opportunity to follow dynamic behavior of specific molecules under physiological conditions. In the fission yeast Schizosaccharomyces pombe, expression of a target protein genetically fused with a fluorescent protein such as the jellyfish green fluorescent protein (GFP) is widely used. In addition, fluorescent chemical reagents are also used to stain specific molecules (e.g., Hoechst 33324 to stain DNA). Specimens of S. pombe cells for live cell imaging are prepared by either of two methods: sandwiching the cells between glass coverslips and by mounting the cells on a glass-bottom culture dish...
July 21, 2017: Cold Spring Harbor Protocols
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