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https://www.readbyqxmd.com/read/28733226/allatoregulatory-like-systems-and-changes-in-cytosolic-ca-2-modulate-feeding-behaviour-in-hydra
#1
María Eugenia Alzugaray, Jorge Rafael Ronderos
Allatotropin (AT) and allatostatin-C (AST-C) are neuropeptides originally characterized by their ability to modulate the secretion of juvenile hormones in insects. Beyond the allatoregulatory function, these neuropeptides are pleiotropic acting as myoregulators not only in insects, but also in other groups of invertebrates. We have previously proposed the existence of AT and AST-C like systems in Hydra sp., a member of the phylum Cnidaria, which is a basal group of Metazoa, sharing a common ancestor with Bilateria...
July 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28720323/rapid-divergence-of-histones-in-hydrozoa-cnidaria-and-evolution-of-a-novel-histone-involved-in-dna-damage-response-in-hydra
#2
Puli Chandramouli Reddy, Suyog Ubhe, Neha Sirwani, Rasika Lohokare, Sanjeev Galande
Histones are fundamental components of chromatin in all eukaryotes. Hydra, an emerging model system belonging to the basal metazoan phylum Cnidaria, provides an ideal platform to understand the evolution of core histone components at the base of eumetazoan phyla. Hydra exhibits peculiar properties such as tremendous regenerative capacity, lack of organismal senescence and rarity of malignancy. In light of the role of histone modifications and histone variants in these processes it is important to understand the nature of histones themselves and their variants in hydra...
June 15, 2017: Zoology: Analysis of Complex Systems, ZACS
https://www.readbyqxmd.com/read/28716475/fouling-assemblage-of-benthic-plastic-debris-collected-from-mersin-bay-ne-levantine-coast-of-turkey
#3
Sedat Gündoğdu, Cem Çevik, Serkan Karaca
The Mediterranean is an ecosystem that faces more and more microplastic pollution every day. This causes the whole of the Mediterranean to face the negative effects of plastic pollution. This study examines the state of plastic debris and fouling organisms found on it in one of the areas most affected by plastic pollution, Mersin Bay. As a result, a total of 3.88kg plastic (mean=0,97kg; n=120; 2670item/km(2); 86,3kg/km(2)) was collected and based on the ATR-FTIR analysis, it was determined that this total contained 9 types of plastics...
July 14, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28711466/comparative-proteomics-reveals-recruitment-patterns-of-some-protein-families-in-the-venoms-of-cnidaria
#4
Adrian Jaimes-Becerra, Ray Chung, André C Morandini, Andrew J Weston, Gabriel Padilla, Ranko Gacesa, Malcolm Ward, Paul F Long, Antonio C Marques
Cnidarians are probably the oldest group of animals to be venomous, yet our current picture of cnidarian venom evolution is highly imbalanced due to limited taxon sampling. High-throughput tandem mass spectrometry was used to determine venom composition of the scyphozoan Chrysaora lactea and two cubozoans Tamoya haplonema and Chiropsalmus quadrumanus. Protein recruitment patterns were then compared against 5 other cnidarian venom proteomes taken from the literature. A total of 28 putative toxin protein families were identified, many for the first time in Cnidaria...
July 13, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28710419/generation-of-clade-and-symbiont-specific-antibodies-to-characterize-marker-molecules-during-cnidaria-symbiodinium-endosymbiosis
#5
Kao-Jean Huang, Zi-Yu Huang, Ching-Yen Lin, Li-Hsueh Wang, Pin-Hsiang Chou, Chii-Shiarng Chen, Hsing-Hui Li
The endosymbiosis between cnidarians and dinoflagellates is responsible for the formation of coral reefs. Changes in molecules have been identified during the process of cnidaria-Symbiodinium endosymbiosis. However, the complexity of the molecular interaction has prevented the establishment of a mechanistic explanation of cellular regulation in this mutualistic symbiosis. To date, no marker molecules have been identified to specifically represent the symbiotic status. Because the endosymbiotic association occurs in the symbiotic gastrodermal cells (SGCs), whole cells of isolated SGCs were used as an antigen to generate monoclonal antibodies (mAb) to screen possible molecular candidates of symbiotic markers...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28707028/involvement-of-aurantiactinomyxon-in-the-life-cycle-of-thelohanellus-testudineus-cnidaria-myxosporea-from-allogynogenetic-gibel-carp-carassius-auratus-gibelio-with-morphological-ultrastructural-and-molecular-analysis
#6
Dan Dan Zhao, Yan Hua Zhai, Yang Liu, Si Jia Wang, Ze Mao Gu
During the investigation of actinosporean fauna diversity from commercial fish ponds in Hubei Province, China, a novel aurantiactinomyxon type was found from Branchiura sowerbyi. Spore body of the aurantiactinomyxon was ellipsoidal in side view and triangular in apical view, 15.5 ± 0.5 (14.5-16.4) μm in diameter; three leaf-like caudal processes were approximately equal, measuring 13.2 ± 0.9 (11.5-16.2) μm long and 7.4 ± 0.4 (6.7-8.0) μm wide at the base; three polar capsules were located at the apex of spore body, globular in apical view, 2...
July 13, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28705830/molecular-and-ultrastructural-studies-of-a-fibrillar-collagen-from-octocoral-cnidaria
#7
Joseph P R O Orgel, Ido Sella, Rama S Madhurapantula, Olga Antipova, Yael Mandelberg, Yoel Kashman, Dafna Benayahu, Yehuda Benayahu
We report here the biochemical, molecular and ultrastructural features of a unique organization of fibrillar collagen extracted from the octocoral Sarcophyton ehrenbergi Collagen, the most abundant protein in the animal kingdom, is often defined as a structural component of extra-cellular matrices in metazoans. In the present study, collagen fibers were extracted from the mesenteries of S. ehrenbergi polyps. These fibers are organized as filaments and further compacted as coiled fibers. The fibers are uniquely long, reaching an unprecedented length of tens of centimeters...
July 13, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28664868/observations-on-non-random-distribution-of-spores-of-henneguya-spp-cnidaria-myxosporea-myxobolidae-within-plasmodia
#8
Jorge C Eiras, Manuel Cruz, Cristina Cruz, Aurelia Saraiva, Edson A Adriano, Csaba Szekely, Kalman Molnar
Species of the cnidarian genus Henneguya Thélohan, 1892 (Myxosporea: Myxobolidae) are histozoic parasites commonly found in freshwater and, more rarely, in marine fish. The development of these parasites in fish tissues includes the formation of plasmodia within which occurs the sporogony originating spores with two caudal processes, which are usually randomly distributed within the plasmodia. In this report the authors present some cases of non-random distribution of the spores of six species of Henneguya within their plasmodia...
June 20, 2017: Folia Parasitologica
https://www.readbyqxmd.com/read/28623350/multiplexed-spliced-leader-sequencing-a-high-throughput-selective-method-for-rna-seq-in-trypanosomatids
#9
Bart Cuypers, Malgorzata A Domagalska, Pieter Meysman, Géraldine de Muylder, Manu Vanaerschot, Hideo Imamura, Franck Dumetz, Thomas Wolf Verdonckt, Peter J Myler, Gowthaman Ramasamy, Kris Laukens, Jean-Claude Dujardin
High throughput sequencing techniques are poorly adapted for in vivo studies of parasites, which require prior in vitro culturing and purification. Trypanosomatids, a group of kinetoplastid protozoans, possess a distinctive feature in their transcriptional mechanism whereby a specific Spliced Leader (SL) sequence is added to the 5'end of each mRNA by trans-splicing. This allows to discriminate Trypansomatid RNA from mammalian RNA and forms the basis of our new multiplexed protocol for high-throughput, selective RNA-sequencing called SL-seq...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28614409/environmental-control-of-asexual-reproduction-and-somatic-growth-of-aurelia-spp-cnidaria-scyphozoa-polyps-from-the-adriatic-sea
#10
Nathan Hubot, Cathy H Lucas, Stefano Piraino
Polyps of two moon jellyfish species, Aurelia coerulea and A. relicta, from two Adriatic Sea coastal habitats were incubated under multiple combinations of temperature (14, 21°C), salinity (24, 37 ppt) and food regime (9.3, 18.6, 27.9 μg C ind-1 week-1) to comparatively assess how these factors may influence major asexual reproduction processes in the two species. Both species exhibited a shared pattern of budding mode (Directly Budded Polyps: DBP; Stolonal Budded Polyps: SBP), with DBP favoured under low food supply (9...
2017: PloS One
https://www.readbyqxmd.com/read/28610340/myxosporea-cnidaria-myxozoa-infecting-the-saddled-seabream-oblada-melanura-l-1758-teleostei-sparidae-and-the-painted-comber-serranus-scriba%C3%A2-l-1758-teleostei-serranidae-in-tunisia
#11
Sayef Laamiri
First parasitological surveys of Myxozoa are performed on the sparid saddled seabream Oblada melanura (Linnaeus, 1758) and the serranid painted comber Serranus scriba (Linnaeus, 1758) caught from the Bay of Bizerte and the Gulf of Tunis respectively in Northeast Tunisia, Western Mediterranean. In this study, 6 bivalvulid myxosporean species belonging to the 3 genera Ceratomyxa Thélohan, 1892, Myxodavisia Zhao, Zhou, Kent & Whipps, 2008 and Zschokkella Auerbach, 1910, are isolated infecting their hosts. Two species Ceratomyxa sp...
May 19, 2017: Zootaxa
https://www.readbyqxmd.com/read/28610031/a-new-species-of-clausophyid-calycophoran-siphonophore-cnidaria-hydrozoa-i-kephyes-i-i-hiulcus-i-sp-nov-widely-distributed-throughout-the-world-s-oceans
#12
Mary Matilda Grossmann, Dhugal John Lindsay
A new species of clausophyid siphonophore, Kephyes hiulcus sp. nov. is described. It can most easily be differentiated from its congener Kephyes ovata by the shape of the hydroecium in the anterior nectophore of the polygastric stage. This is open over the entire height of the nectophore in K. hiulcus sp. nov., and it is this character from which its specific name is derived. This species was found in the eastern and western Pacific Ocean, as well as the Celebes and Mediterranean Seas, indicating that this species is both relatively common and geographically widespread...
April 3, 2017: Zootaxa
https://www.readbyqxmd.com/read/28609939/additions-to-the-hydroids-cnidaria-hydrozoa-of-the-bay-of-fundy-northeastern-north-america-with-a-checklist-of-species-reported-from-the-region
#13
Dale R Calder
Two new species of hydroids, Eudendrium bleakneyi and Halecium praeparvum, are described from the Bay of Fundy. Fourteen others, Tubularia acadiae Petersen, 1990, Coryne pusilla Gaertner, 1774, Sarsia lovenii (M. Sars, 1846), Zanclea implexa (Alder, 1856), Corydendrium dispar Kramp, 1935, Rhizogeton fusiformis L. Agassiz, 1862, Bougainvillia muscus (Allman, 1863), Rhizorhagium roseum M. Sars, in G.O. Sars, 1874, Hydractinia symbiolongicarpus Buss & Yund, 1989, Eudendrium vaginatum Allman, 1863, Tiaropsis multicirrata (M...
April 24, 2017: Zootaxa
https://www.readbyqxmd.com/read/28601529/functional-studies-on-the-role-of-notch-signaling-in-hydractinia-development
#14
James M Gahan, Christine E Schnitzler, Timothy Q DuBuc, Liam B Doonan, Justyna Kanska, Sebastian G Gornik, Sofia Barreira, Kerry Thompson, Philipp Schiffer, Andreas D Baxevanis, Uri Frank
The function of Notch signaling was previously studied in two cnidarians, Hydra and Nematostella, representing the lineages Hydrozoa and Anthozoa, respectively. Using pharmacological inhibition in Hydra and a combination of pharmacological and genetic approaches in Nematostella, it was shown in both animals that Notch is required for tentacle morphogenesis and for late stages of stinging cell maturation. Surprisingly, a role for Notch in neural development, which is well documented in bilaterians, was evident in embryonic Nematostella but not in adult Hydra...
August 1, 2017: Developmental Biology
https://www.readbyqxmd.com/read/28589847/comparison-of-the-inducing-effect-of-indole-compounds-on-medusa-formation-in-different-classes-of-medusozoa
#15
Luna Yamamori, Kazuya Okuizumi, Chika Sato, Shuhei Ikeda, Haruhiko Toyohara
Scyphozoa, Cubozoa and Hydrozoa are classes in the phylum Cnidaria that undergo metagenesis involving a dramatic morphological transition. In Scyphozoa and Cubozoa, when exposed to species- or strain-specific transition-inducing stimuli, asexually reproducing benthic polyps transform into sexually reproducing planktonic medusae. In Hydrozoa, exposure to species- or strainspecific transition-inducing stimuli causes formation of medusa buds in the polyp's body. In Aurelia aurita (Linnaeus, 1758) (Scyphozoa, Semaeostomeae), polyp-to-jellyfish transition is induced by some simple indole compounds...
June 2017: Zoological Science
https://www.readbyqxmd.com/read/28562782/first-record-of-solmundella-bitentaculata-cnidaria-aeginidae-in-par%C3%A3-state-shelf-brazil
#16
T N S Banha, S N Stampar, J E Martinelli-Filho
No abstract text is available yet for this article.
May 25, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28557992/seasonal-monitoring-of-deep-sea-megabenthos-in-barkley-canyon-cold-seep-by-internet-operated-vehicle-iov
#17
Carolina Doya, Damianos Chatzievangelou, Nixon Bahamon, Autun Purser, Fabio C De Leo, S Kim Juniper, Laurenz Thomsen, Jacopo Aguzzi
Knowledge of the processes shaping deep-sea benthic communities at seasonal scales in cold-seep environments is incomplete. Cold seeps within highly dynamic regions, such as submarine canyons, where variable current regimes may occur, are particularly understudied. Novel Internet Operated Vehicles (IOVs), such as tracked crawlers, provide new techniques for investigating these ecosystems over prolonged periods. In this study a benthic crawler connected to the NEPTUNE cabled infrastructure operated by Ocean Networks Canada was used to monitor community changes across 60 m2 of a cold-seep area of the Barkley Canyon, North East Pacific, at ~890 m depth within an Oxygen Minimum Zone (OMZ)...
2017: PloS One
https://www.readbyqxmd.com/read/28501690/toxicity-estimates-for-diuron-and-atrazine-for-the-tropical-marine-cnidarian-exaiptasia-pallida-and-in-hospite-symbiodinium-spp-using-pam-chlorophyll-a-fluorometry
#18
Pelli Louise Howe, Amanda Jean Reichelt-Brushett, Malcolm William Clark, Cliff Ross Seery
Effective ecotoxicological risk assessments for herbicides in tropical marine environments are restricted by a lack of toxicity data, sensitive test methods and endpoints for relevant species, and this requires rectification. The symbiotic sea anemone Exaiptasia pallida is a suitable test species, representing the phylum Cnidaria and allowing for assessments of toxicological responses of both the animal host and in-hospite Symbiodinium spp. Pulse amplitude modulated (PAM) chlorophyll-a fluorometry is recognised as a valuable ecotoxicological tool, and here newly-developed test methods are presented using PAM fluorometry to measure herbicide effects on photosynthetic efficiency of in-hospite Symbiodinium spp...
June 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28457868/cell-cycle-coupled-oscillations-in-apical-polarity-and-intercellular-contact-maintain-order-in-embryonic-epithelia
#19
Katerina Ragkousi, Kendra Marr, Sean McKinney, Lacey Ellington, Matthew C Gibson
Throughout animals, embryonic cells must ultimately organize into polarized epithelial layers that provide the structural basis for gastrulation or subsequent developmental events [1]. Precisely how this primary epithelium maintains continuous integrity during rapid and repeated cell divisions has never been directly addressed, particularly in cases where early cleavages are driven in synchrony. Representing the early-branching non-bilaterian phylum Cnidaria, embryos of the sea anemone Nematostella vectensis undergo rapid synchronous cell divisions and ultimately give rise to a diploblastic epithelial body plan after gastrulation [2, 3]...
May 8, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28447044/molecular-and-phylogenetic-characterization-of-thelohanellus-boggoti-qadri-1962-cnidaria-myxosporea-bivalvulida-infecting-the-fin-of-indian-minor-carp-labeo-dero-hamilton-1822
#20
Harpreet Kaur, Aditya Gupta
A myxozoan parasite belonging to the genus Thelohanellus Kudo, 1933 (Cnidaria, Myxosporea, Bivalvulida) was isolated from the fins of Labeo dero inhabiting Ranjit Sagar Wetland, Punjab, India. The plasmodium was 0.5-0.7 mm in diameter each containing 80- 100 number of myxospores. Myxospores were egg shaped to ovoidal in valvular view having bluntly pointed anterior and broad rounded posterior end measuring 8.36x 4.77 µm. Polar capsule was single, broadly pyriform in shape, measuring 4.77x3.98 µm in size containing a polar filament coiled perpendicular to the longitudinal axis of myxospore body making 7-9 turns...
March 2017: Molecular Biology Research Communications
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