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https://www.readbyqxmd.com/read/27890264/selective-suppression-of-in-situ-proliferation-of-scyphozoan-polyps-by-biofouling
#1
Song Feng, Shi-Wei Wang, Guang-Tao Zhang, Song Sun, Fang Zhang
An increase in marine artificial constructions has been proposed as a major cause of jellyfish blooms, because these constructions provide additional substrates for organisms at the benthic stage (polyps), which proliferate asexually and release a large amount of free-swimming medusae. These hard surfaces are normally covered by fouling communities, the components of which have the potential to impede the proliferation of polyps. In this study, we report an in situ experiment of polyp survival of four large scyphozoan species found in East Asian marginal seas that were exposed to biofouling, a universal phenomenon occurring on marine artificial constructions...
November 24, 2016: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/27880678/evidence-for-an-alternative-mechanism-of-toxin-production-in-the-box-jellyfish-alatina-alata
#2
Cheryl Lewis Ames, Jason Macrander
Cubozoans (box jellyfish) have a reputation as the most venomous animals on the planet. Herein, we provide a review of cubozoan prey capture and digestion informed by the scientific literature. Like all cnidarians, box jellyfish envenomation originates from structures secreted within nematocyte post-Golgi vesicles called nematocysts. When tentacles come in contact with prey or would-be predators, a cocktail of toxins is rapidly deployed from nematocysts via a long spiny tubule that serves to immobilize the target organism...
November 2016: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/27858592/ultrasound-guided-access-into-the-abdomen-in-the-setting-of-portal-hypertension-a-novel-technique
#3
Cory N Criss, Matthew W Ralls, Marcus D Jarboe
As the field of minimally invasive surgery rapidly evolves, there is an opportunity to adopt innovative techniques to accommodate a variety of patient populations. In patients with portal hypertension, a major risk factor upon entry into the abdomen is injury to large, engorged paraumbilical vessels in the anterior abdominal wall. Major blood loss often results from just entering the abdomen. Here, we describe a patient with caput medusae secondary to portal hypertension presenting for laparoscopic repair of a ventral hernia...
November 18, 2016: Journal of Laparoendoscopic & Advanced Surgical Techniques. Part A
https://www.readbyqxmd.com/read/27845203/complete-mitochondrial-genome-and-evolutionary-analysis-of-turritopsis-dohrnii-the-immortal-jellyfish-with-a-reversible-life-cycle
#4
A A Lisenkova, A P Grigorenko, T V Tyazhelova, T V Andreeva, F E Gusev, A D Manakhov, A Yu Goltsov, S Piraino, M P Miglietta, E I Rogaev
Turritopsis dohrnii (Cnidaria, Hydrozoa, Hydroidolina, Anthoathecata) is the only known metazoan that is capable of reversing its life cycle via morph rejuvenation from the adult medusa stage to the juvenile polyp stage. Here, we present a complete mitochondrial (mt) genome sequence of T. dohrnii, which harbors genes for 13 proteins, two transfer RNAs, and two ribosomal RNAs. The T. dohrnii mt genome is characterized by typical features of species in the Hydroidolina subclass, such as a high A+T content (71...
November 11, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27820907/box-jellyfish-alatina-alata-has-a-circumtropical-distribution
#5
Jonathan W Lawley, Cheryl Lewis Ames, Bastian Bentlage, Angel Yanagihara, Roger Goodwill, Ehsan Kayal, Kikiana Hurwitz, Allen G Collins
Species of the box jellyfish (Cubozoa) genus Alatina are notorious for their sting along the beaches of several localities of the Atlantic and Pacific. These species include Alatina alata on the Caribbean Island of Bonaire (the Netherlands), A. moseri in Hawaii, and A. mordens in Australia. Most cubozoans inhabit coastal waters, but Alatina is unusual in that specimens have also been collected in the open ocean at great depths. Alatina is notable in that populations form monthly aggregations for spermcast mating in conjunction with the lunar cycle...
October 2016: Biological Bulletin
https://www.readbyqxmd.com/read/27812408/comparative-internal-anatomy-of-staurozoa-cnidaria-with-functional-and-evolutionary-inferences
#6
Lucília S Miranda, Allen G Collins, Yayoi M Hirano, Claudia E Mills, Antonio C Marques
Comparative efforts to understand the body plan evolution of stalked jellyfishes are scarce. Most characters, and particularly internal anatomy, have neither been explored for the class Staurozoa, nor broadly applied in its taxonomy and classification. Recently, a molecular phylogenetic hypothesis was derived for Staurozoa, allowing for the first broad histological comparative study of staurozoan taxa. This study uses comparative histology to describe the body plans of nine staurozoan species, inferring functional and evolutionary aspects of internal morphology based on the current phylogeny of Staurozoa...
2016: PeerJ
https://www.readbyqxmd.com/read/27811739/the-polyps-of-oceania-armata-identified-by-dna-barcoding-cnidaria-hydrozoa
#7
Peter Schuchert
The polyps of the widely distributed medusa Oceania armata have never been found in nature and only the primary polyp is known from breeding experiments. The fully developed colony is so far unknown. This report shows that DNA sequence data of the medusa stage of O. armata permits to identify several hydroid colonies from different geographic origins as the most likely polyp stage of this medusa. These hydroids had previously been misidentified as Turritopsis species, a closely related genus which also produces medusae resembling Oceania armata...
October 18, 2016: Zootaxa
https://www.readbyqxmd.com/read/27764538/comparative-evaluation-of-chemical-profiles-of-three-representative-snow-lotus-herbs-by-uplc-dad-qtof-ms-combined-with-principal-component-and-hierarchical-cluster-analyses
#8
Qi-Lei Chen, Lin Zhu, Yi-Na Tang, Hiu-Yee Kwan, Zhong-Zhen Zhao, Hu-Biao Chen, Tao Yi
Herbal healthcare products are used worldwide as relatively safe and effective alternatives to allopathic drugs. Saussurea laniceps Hand.-Mazz.(SL), S. medusa Maxim. (SM) and S. involucrata (Kar. et Kir.) Sch.Bip. (SI) are three sources of the renowned "snow lotus" Chinese Materia Medica for treating inflammatory diseases. The three species have different therapeutic effects, among which SL has been proved to be the most potent, but they are frequently confused on the market and in the academic community. An ultra-high performance liquid chromatography-diode array detector-quadrupole time of flight-mass spectrometry (UPLC-DAD-QTOF-MS) method was developed and used to analyze 49 herbal samples for species analysis and overall quality evaluation...
October 20, 2016: Drug Testing and Analysis
https://www.readbyqxmd.com/read/27696494/muscle-and-nerve-net-organization-in-stalked-jellyfish-medusozoa-staurozoa
#9
Hannah E Westlake, Louise R Page
Staurozoan cnidarians display an unusual combination of polyp and medusa characteristics and their morphology may be informative about the evolutionary origin of medusae. We studied neuromuscular morphology of two staurozoans, Haliclystus 'sanjuanensis' and Manania handi, using whole mount immunohistochemistry with antibodies against FMRFamide and α-tubulin to label neurons and phalloidin to label muscles. All muscles appeared to lack striations. Longitudinal interradial muscles are probable homologues of stalk muscles in scyphopolyps, but in adult staurozoans they are elaborated to inwardly flex marginal lobes of the calyx during prey capture; these muscles are pennate in M...
October 2, 2016: Journal of Morphology
https://www.readbyqxmd.com/read/27685330/associations-between-an-invasive-plant-taeniatherum-caput-medusae-medusahead-and-soil-microbial-communities
#10
Elise S Gornish, Noah Fierer, Albert Barberán
Understanding plant-microbe relationships can be important for developing management strategies for invasive plants, particularly when these relationships interact with underlying variables, such as habitat type and seedbank density, to mediate control efforts. In a field study located in California, USA, we investigated how soil microbial communities differ across the invasion front of Taeniatherum caput-medusae (medusahead), an annual grass that has rapidly invaded most of the western USA. Plots were installed in habitats where medusahead invasion is typically successful (open grassland) and typically not successful (oak woodland)...
2016: PloS One
https://www.readbyqxmd.com/read/27678847/caput-medusae
#11
W M Al Ghafri, M N Al Shukri
No abstract text is available yet for this article.
November 2015: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/27639479/phylogenetic-relationships-of-proboscoida-broch-1910-cnidaria-hydrozoa-are-traditional-morphological-diagnostic-characters-relevant-for-the-delimitation-of-lineages-at-the-species-genus-and-family-levels
#12
Amanda F Cunha, Allen G Collins, Antonio C Marques
Overlapping variation of morphological characters can lead to misinterpretation in taxonomic diagnoses and the delimitation of different lineages. This is the case for hydrozoans that have traditionally been united in the family Campanulariidae, a group known for its wide morphological variation and complicated taxonomic history. In a recently proposed phylogenetic classification of leptothecate hydrozoans, this family was restricted to a more narrow sense while a larger clade containing most species traditionally classified in Campanulariidae, along with members of Bonneviellidae, was established as the suborder Proboscoida...
September 14, 2016: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/27614735/reflectance-confocal-microscopy-in-lentigo-maligna
#13
R Gamo, A Pampín, U Floristán
Lentigo maligna is the most common type of facial melanoma. Diagnosis is complicated, however, as it shares clinical and dermoscopic characteristics with other cutaneous lesions of the face. Reflectance confocal microscopy is an imaging technique that permits the visualization of characteristic features of lentigo maligna. These include a disrupted honeycomb pattern and pagetoid cells with a tendency to show folliculotropism. These cells typically have a dendritic morphology, although they may also appear as round cells measuring over 20μm with atypical nuclei...
September 7, 2016: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/27540261/a-national-survey-to-identify-how-displacement-value-information-is-used-and-presented-to-clinical-staff-in-nhs-hospitals
#14
Nanna Christiansen, Zinab Kehk, Susan Keeling, Bryony Dean
AIM: The use of displacement values (DVs) when preparing intravenous (IV) medication for children enables accurate doses to be given1 and is assumed to be common paediatric practice. This survey aimed to assess views of UK paediatric pharmacists on DVs in practice to explore:▸ How prevalent is DV use in the paediatric hospital setting▸ Which type of IV administration guidelines were being used▸ Which form of DV presentation is perceived to be most practical▸ Which method of calculation is preferred METHOD: A national cross-sectional survey study was undertaken...
September 2016: Archives of Disease in Childhood
https://www.readbyqxmd.com/read/27535656/a-new-transcriptome-and-transcriptome-profiling-of-adult-and-larval-tissue-in-the-box-jellyfish-alatina-alata-an-emerging-model-for-studying-venom-vision-and-sex
#15
Cheryl Lewis Ames, Joseph F Ryan, Alexandra E Bely, Paulyn Cartwright, Allen G Collins
BACKGROUND: Cubozoans (box jellyfish) are cnidarians that have evolved a number of distinguishing features. Many cubozoans have a particularly potent sting, effected by stinging structures called nematocysts; cubozoans have well-developed light sensation, possessing both image-forming lens eyes and light-sensitive eye spots; and some cubozoans have complex mating behaviors, including aggregations, copulation and internal fertilization. The cubozoan Alatina alata is emerging as a cnidarian model because it forms predictable monthly nearshore breeding aggregations in tropical to subtropical waters worldwide, making both adult and larval material reliably accessible...
August 17, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27531602/sex-polyps-and-medusae-determination-and-maintenance-of-sex-in-cnidarians
#16
Stefan Siebert, Celina E Juliano
Mechanisms of sex determination vary greatly among animals. Here we survey what is known in Cnidaria, the clade that forms the sister group to Bilateria and shows a broad array of sexual strategies and sexual plasticity. This observed diversity makes Cnidaria a well-suited taxon for the study of the evolution of sex determination, as closely related species can have different mechanisms, which allows for comparative studies. In this review, we survey the extensive descriptive data on sexual systems (e.g. gonochorism and hermaphroditism) and the plasticity of sex in various cnidarian taxa...
August 17, 2016: Molecular Reproduction and Development
https://www.readbyqxmd.com/read/27515647/dna-barcodes-unite-two-problematic-taxa-the-meiobenthic-boreohydra-simplex-is-a-life-cycle-stage-of-plotocnide-borealis-hydrozoa-aplanulata
#17
Sofia V Pyataeva, Russell R Hopcroft, Dhugal J Lindsay, Allen G Collins
Genetic barcodes of arctic medusae and meiobenthic cnidarians have uncovered a fortuitous connection between the medusa Plotocnide borealis Wagner, 1885 and the minute, mud-dwelling polyp Boreohydra simplex Westblad, 1937. Little to no sequence differences exist among independently collected samples identified as Boreohydra simplex and Plotocnide borealis, showing that the two different forms represent a single species that is henceforth known by the older name Plotocnide borealis Wagner, 1885. The polyp form has been observed to produce bulges previously hypothesized to be gonophores, and the results here are consistent with that view...
2016: Zootaxa
https://www.readbyqxmd.com/read/27498796/de-novo-assembly-of-the-transcriptome-of-turritopsis-a-jellyfish-that-repeatedly-rejuvenates
#18
Yoshinori Hasegawa, Takashi Watanabe, Masaki Takazawa, Osamu Ohara, Shin Kubota
In most animals, aging is an irreversible process; however the species Turritopsis sp. has been observed to undergo a rejuvenation process as many as 14 times. In the present study, we used multiplexed RNA libraries to obtain the transcriptome from four developmental stages (St) of Turritopsis sp., including (I) immature medusa, (II) dumpling, (III) dumpling with a short stolon, and (IV) polyp, which had recently rejuvenated. A total of 4.02 billion paired-end reads were assembled de novo, yielding 90,327 contigs...
August 2016: Zoological Science
https://www.readbyqxmd.com/read/27478251/where-are-the-polyps-molecular-identification-distribution-and-population-differentiation-of-aurelia-aurita-jellyfish-polyps-in-the-southern-north-sea-area
#19
Lodewijk van Walraven, Floor Driessen, Judith van Bleijswijk, Anneke Bol, Pieternella C Luttikhuizen, Joop W P Coolen, Oscar G Bos, Adriaan Gittenberger, Niels Schrieken, Victor T Langenberg, Henk W van der Veer
For many species of metagenic jellyfish the location of the benthic polyps is unknown. To gain insight in the distribution, species composition and population structure of scyphozoan jellyfish polyps in the southern North Sea area, polyp samples were collected from natural and artificial substrates (settling plates, marina floats and wrecks) at ten inshore locations in the Netherlands, seven offshore locations in the North Sea and in the Gullmar Fjord in Sweden. Polyps were identified to species level by sequencing both a fragment of 18S rDNA and a fragment of mitochondrial COI, and comparing these sequences to reference sequences available in GenBank and to newly obtained sequences from medusae collected in the area...
2016: Marine Biology
https://www.readbyqxmd.com/read/27441693/thermal-and-osmotic-tolerance-of-irukandji-polyps-cubozoa-carukia-barnesi
#20
Robert Courtney, Sally Browning, Tobin Northfield, Jamie Seymour
This research explores the thermal and osmotic tolerance of the polyp stage of the Irukandji jellyfish Carukia barnesi, which provides new insights into potential polyp habitat suitability. The research also targets temperature, salinity, feeding frequency, and combinations thereof, as cues for synchronous medusae production. Primary findings revealed 100% survivorship in osmotic treatments between 19 and 46‰, with the highest proliferation at 26‰. As salinity levels of 26‰ do not occur within the waters of the Great Barrier Reef or Coral Sea, we conclude that the polyp stage of C...
2016: PloS One
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