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Relevant bibliographies by topics / Azadinium

Academic literature on the topic 'Azadinium'

Author: Grafiati

Published: 1 April 2023

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Contents

Journal articles
Dissertations / Theses
Book chapters

Journal articles on the topic "Azadinium":

1

Fabro, Elena, Gastón O. Almandoz, Bernd Krock, and Urban Tillmann. "Field observations of the dinoflagellate genus Azadinium and azaspiracid toxins in the south-west Atlantic Ocean." Marine and Freshwater Research 71, no. 7 (2020): 832. http://dx.doi.org/10.1071/mf19124.

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Abstract:

Some dinoflagellate species of the genera Azadinium and Amphidoma (Amphidomataceae) produce azaspiracids (AZA), a group of toxins responsible for gastrointestinal disorders in humans following the consumption of contaminated shellfish. In this study, we investigated the diversity, distribution and abundance of Azadinium and AZA from field plankton samples collected during four oceanographic expeditions that covered an extended area of the Argentine Sea during different seasons. Scanning electron microscopy analyses indicated the presence of five Azadinium species: Az. dexteroporum, Az. luciferelloides, Az. obesum, Az. asperum and Az. cf. poporum. Azadinium-like cells were frequently found and were even an abundant component of plankton assemblages, showing a wide latitudinal distribution, from ~38 to ~55.5°S, and occurring in a wide temperature and salinity range. High cell densities (up to 154000cellsL–1) occurred in northern slope and external shelf waters during spring. AZA-2 was detected in net samples from the 20- to 200-µm fractions by tandem mass spectrometry–liquid chromatography analysis, suggesting a transfer of AZA through the food web. Our results contribute to the knowledge of the worldwide occurrence of Azadinium species and AZA, and highlight the importance of amphidomatacean species as a potential source of AZA shellfish poisoning in the south-west Atlantic Ocean.

2

Kim, Joo-Hwan, Urban Tillmann, Nicolaus G. Adams, Bernd Krock, Whitney L. Stutts, Jonathan R. Deeds, Myung-Soo Han, and Vera L. Trainer. "Identification of Azadinium species and a new azaspiracid from Azadinium poporum in Puget Sound, Washington State, USA." Harmful Algae 68 (September 2017): 152–67. http://dx.doi.org/10.1016/j.hal.2017.08.004.

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3

Tillmann, Urban, Sylvia Soehner, Elisabeth Nézan, and Bernd Krock. "First record of the genus Azadinium (Dinophyceae) from the Shetland Islands, including the description of Azadinium polongum sp. nov." Harmful Algae 20 (December 2012): 142–55. http://dx.doi.org/10.1016/j.hal.2012.10.001.

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4

Jauffrais, Thierry, Christine Herrenknecht, Véronique Séchet, Manoella Sibat, Urban Tillmann, Bernd Krock, Jane Kilcoyne, et al. "Quantitative analysis of azaspiracids in Azadinium spinosum cultures." Analytical and Bioanalytical Chemistry 403, no. 3 (February 26, 2012): 833–46. http://dx.doi.org/10.1007/s00216-012-5849-2.

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5

Potvin, Éric, Hae Jin Jeong, Nam Seon Kang, Urban Tillmann, and Bernd Krock. "First Report of the Photosynthetic Dinoflagellate Genus Azadinium in the Pacific Ocean: Morphology and Molecular Characterization of Azadinium cf. poporum." Journal of Eukaryotic Microbiology 59, no. 2 (December 20, 2011): 145–56. http://dx.doi.org/10.1111/j.1550-7408.2011.00600.x.

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6

Tillmann, Urban, Sonia Sánchez-Ramírez, Bernd Krock, and Avy Bernales-Jiménez. "A bloom of Azadinium polongum in coastal waters off Peru." Revista de biología marina y oceanografía 52, no. 3 (December 2017): 591–610. http://dx.doi.org/10.4067/s0718-19572017000300015.

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7

Krock, Bernd, Urban Tillmann, Matthias Witt, and Haifeng Gu. "Azaspiracid variability of Azadinium poporum (Dinophyceae) from the China Sea." Harmful Algae 36 (June 2014): 22–28. http://dx.doi.org/10.1016/j.hal.2014.04.012.

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8

Luo, Zhaohe, Haifeng Gu, Bernd Krock, and Urban Tillmann. "Azadinium dalianense, a new dinoflagellate species from the Yellow Sea, China." Phycologia 52, no. 6 (November 2013): 625–36. http://dx.doi.org/10.2216/13-178.1.

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9

Tillmann, Urban, Bernd Krock, and Bettina B. Taylor. "Azadinium caudatumvar.margalefii, a poorly known member of the toxigenic genusAzadinium(Dinophyceae)." Marine Biology Research 10, no. 10 (May 27, 2014): 941–56. http://dx.doi.org/10.1080/17451000.2013.866252.

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10

Hernández-Becerril, David U., Sofía A. Barón-Campis, and Sergio Escobar-Morales. "A new record of Azadinium spinosum (Dinoflagellata) from the tropical Mexican Pacific." Revista de biología marina y oceanografía 47, no. 3 (December 2012): 553–57. http://dx.doi.org/10.4067/s0718-19572012000300016.

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More sources

Dissertations / Theses on the topic "Azadinium":

1

Paterson, Ruth Flora. "Investigating the distribution, seasonal dynamics and toxicity of Azadinium spinosum in Scottish waters using qPCR." Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237753.

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Abstract:

The small dinoflagellate Azadinium spinosum produces azaspiracid (AZA) toxins which can contaminate filter feeding shellfish to dangerous levels. Toxin-contaminated shellfish flesh, when consumed by humans, can cause acute intense illness and chronic health issues. Shellfish biotoxins are monitored in Scottish shellfish by Food Standards Scotland (FSS), and the concurrent monitoring of harmful phytoplankton in the water column acts as an important early warning system of future shellfish toxin contaminations. Since A. spinosum is very small (12-16 μm long) it is difficult to identify using a light microscope, therefore molecular techniques have been developed to detect species-specific environmental DNA from phytoplankton samples. In this thesis the application and verification of quantitative real time polymerase chain reaction (qPCR) is discussed in detail and documents its first use in Scottish waters to survey A. spinosum abundance and seasonality. The limit of detection of the method was found to be 2000 ±5600 cells L-1, however it is unclear whether this is adequate for regulatory monitoring because it is not yet understood how cell density in the water column relates to AZA shellfish toxicity. The qPCR probe and primer sequences were also found to be too specific to detect all strains of the A. spinosum species, as new strains have been isolated since their development. This is a significant hindrance to the application of the tool for monitoring which will need to be addressed in the future through the isolation of local A. spinosum strains. Over a year long sampling period, A. spinosum was detected only twice (maximum cell density of 2545 ±5600 cells L-1, August 2014) off the Shetland Islands. The seasonality of the species in Scottish waters could not be assessed with so little data, however other observed harmful species of importance to shellfish regulatory monitoring are discussed; of particular note an unusual bloom of Dinophysis acuta as its association with a temperature front at the mouth of Loch Fyne. This thesis critiques the use of this qPCR technique for A. spinosum detection at high-throughput. The issues which have been highlighted do not prevent its future use by FSS, but highlight specific areas of development which need addressed before national monitoring can occur.

2

Jauffrais, Thierry. "Ecophysiologie des dinoflagellés du genre Azadinium, production toxinique et transfert trophique vers les mollusques bivalves." Nantes, 2012. http://archive.bu.univ-nantes.fr/pollux/show.action?id=040c4b77-66f9-4f28-b05d-261282d9575f.

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Abstract:

Cette thèse a été menée pour développer une méthode d’analyse et de production des azaspiracides (AZA) à partir de cultures d’A. Spinosum. Elle a aussi eu pour objectif l’étude des facteurs environnementaux et nutritionnels influant sur la croissance et la production toxinique d’A. Spinosum. La mise en évidence du lien entre cet organisme et l'accumulation d’AZA dans les moules, ainsi que la clarification des processus d’accumulation, de détoxification et de biotransformation des AZA dans les moules a par ailleurs été réalisée. Les travaux réalisés sur l’analyse des AZA ont permis de définir une procédure d’analyse fiable qui limite notamment la formation d’artéfacts (esters méthyliques d’AZA). Cette étude a permis d’expliquer la formation des AZA méthylés, de déterminer leur structure et de proposer des solutions pour minimiser la formation de ces composés. Ce travail a aussi démontré la faisabilité d’une production durable d’AZA à partir de cultures d’A. Spinosum et a mis en évidence les principaux facteurs influant sur la croissance d’A. Spinosum et sur la production toxinique. Des expériences de contamination sur des moules ont ensuite été réalisées et ont démontré, pour la première fois, le lien directe entre A. Spinosum et l’accumulation des AZA par les moules. Cette accumulation des toxines est très rapide et atteint des concentrations en AZA qui se situent au-delà du seuil réglementaire après seulement 6 h d’exposition. Ces expériences ont aussi montré une rapide biotransformation des AZA dans les moules. Elles ont par ailleurs clarifié les cinétiques d’apparition des différents analogues d’AZA et ont montré que la détoxification des AZA est bi-phasique. Deux dernières études ont mis en évidence, d’une part, l’effet négatif d’A. Spinosum sur l’activité alimentaire des moules, et, d’autre part, la capacité des moules à accumuler les AZA présents dans le milieu sous formes dissoute ou particulaire
This study has been conducted in order to develop the analysis of AZAs and to produce AZAs from A. Spinosum culture. It also aimed at studying the effect of environmental and nutritional factors on growth and toxin production. The study also demonstrated a link between A. Spinosum and the accumulation of AZAs in shellfish, followed by the clarification of the processes of accumulation, detoxification and biotransformation of AZAs into mussels. A quantitative analysis of AZAs in A. Spinosum cultures was developed, and the formation and structure of the AZA methylated analogues was explained and minimised. This work also demonstrated the feasibility of a sustainable production of AZAs from A. Spinosum culture and highlighted the main factors influencing growth and toxin production of A. Spinosum. Using these results, mussel contaminations were performed and demonstrated for the first time the direct link between A. Spinosum and AZA accumulation into mussels. Furthermore, a rapid AZA accumulation above the regulatory limit was observed within 6 h of exposure. These experiments also highlighted the rapid biotransformation of AZA into analogues in shellfish and clarified their kinetics of appearance. Consequently, AZA biotransformation pathways were proposed for different AZA analogues. AZA detoxification was also studied and showed a detoxification with two compartments. Finally, two recent studies demonstrated the negative effect of A. Spinosum on the feeding activity of mussels as well as the ability of mussels to accumulate AZA from dissolved or particulate forms

Book chapters on the topic "Azadinium":

1

Jauffrais, T., V. Séchet, P. Truquet, Zouher Amzil, C. Herrenknecht, and P. Hess. "Effect of Dilution Rate on Azadinium spinosum and Azaspiracid (AZA) Production in Pilot Scale Photobioreactors for the Harvest of AZA1 and -2." In Molluscan Shellfish Safety, 197–204. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6588-7_17.

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