Bibliographies thématiques / Pseudo-nitzschia sp

Littérature scientifique sur le sujet « Pseudo-nitzschia sp »

Auteur : Grafiati
Publié le 5 octobre 2024

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Articles de revues sur le sujet "Pseudo-nitzschia sp"

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Orive, Emma, Lara Pérez-Aicua, Helena David, Koldo García-Etxebarria, Aitor Laza-Martínez, Sergio Seoane et Irati Miguel. « The genus Pseudo-nitzschia (Bacillariophyceae) in a temperate estuary with description of two new species : Pseudo-nitzschia plurisecta sp. nov. and Pseudo-nitzschia abrensis sp. nov. » Journal of Phycology 49, no 6 (11 novembre 2013) : 1192–206. http://dx.doi.org/10.1111/jpy.12130.

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Gai, Frederik Frøsig, Cecilie Kirketerp Hedemand, Deon C. Louw, Kolette Grobler, Bernd Krock, Øjvind Moestrup et Nina Lundholm. « Morphological, molecular and toxigenic characteristics of Namibian Pseudo-nitzschia species – including Pseudo-nitzschia bucculenta sp. nov. » Harmful Algae 76 (juin 2018) : 80–95. http://dx.doi.org/10.1016/j.hal.2018.05.003.

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Riouchi, Ouassila, Faid El Madani, Eric Abadie, Ali Skalli, Mustapha Akodad, Abdelmajid Moumen, Hanane Ait Hmeid, Ghizlane Azizi et Mourad Baghour. « Pseudo-Nitzschia sp (Bacillariophyceae), seasonal distribution in the lagoon of Nador (Morroco) ». E3S Web of Conferences 314 (2021) : 01003. http://dx.doi.org/10.1051/e3sconf/202131401003.

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The goal of this study is to look into the dominance of diatoms, specifically the genus “Pseudo-Nitzschia Sp” at the Nador lagoon level and how it relates to the physicochemical parameters of the environment. From the four sampling stations and for two seasons (spring and summer 2018). This diatom of the genus “Pseudo-Nitzschia Sp” includes toxic species capable of producing domoic acid (DA), a neurotoxin responsible for amnesic intoxication syndrome in humans. During sampling, the species “PseudoNitzschia Sp” showed variable cell densities between stations and seasons. The dominate microalgae were observed during the spring period with a maximum concentration of (4000 Cells / l). And a low viscosity during the summer seasons (140 Cells / l).
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Ramili, Yunita, Halikuddin Umasangaji et Andreyan Drakel. « Composition and Abundance of Phytoplankton with Potential Harmful Algal Blooms (HABs) on Ternate Island Coastal Waters, North Maluku ». Agrikan Jurnal Agribisnis Perikanan 16, no 1 (13 mai 2023) : 83–93. http://dx.doi.org/10.52046/agrikan.v16i1.1519.

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The existence of several species of phytoplankton with potential HABs (Harmful Algal Blooms) was investigated on the coastal waters of Ternate Island. This work aims at describing the distribution, species composition, and the abundance of phytoplankton with potential HABs and their ecological index. Data collection was carried out in August 2022 in the coastal waters of Ternate Island at three research locations, namely in Dorpedu (Station 1), Falajawa, Muhajirin Village (Station 2) and Kulaba (Station 3), respectively. Sampling of phytoplankton uses a filtering method with a plankton net. The results of this study quantified 24 genera of phytoplankton where 11 generas were included the group of potential HABs, namely Leptocylindrus, Coscinodiscus, Pseudo Nitzschia. Rhizosolenia, Chaetoceros, and Nitzschia (Class Bacillariophyceae), Gymnodinium, Protoperidinium, Alexandrium, and Ceratium (Class Dinophyceae), and Phaeocystis (Class Prymnesiophyte). The highest abundance of potential HABs varied between research stations, Rhizosolenia sp. of 7.6388x104 cells/l at station 1, Leptocylindrus sp. of 5.4504x104 cells/l, Phaeocystis sp. of 4.0x104 cells/l at Station 2. On the other hand, the lowest abundance was Nitzschia sp. of 4.1291x102 cells/l at Station 1, Gymnodinium sp. of 4.1291x102 cells/l at Station 2, and Pseudo Nitzschia sp. of 1.2387x103 cells/l at Station 3. Generally, the ecological condition of the phytoplankton community in Ternate Island Waters has a moderate level of species diversity with fairly even distribution of species and no dominance of certain species.
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Percopo, Isabella, Maria Valeria Ruggiero, Sergio Balzano, Priscillia Gourvil, Nina Lundholm, Raffaele Siano, Anna Tammilehto, Daniel Vaulot et Diana Sarno. « Pseudo-nitzschia arctica sp. nov., a new cold-water cryptic Pseudo-nitzschia species within the P. pseudodelicatissima complex ». Journal of Phycology 52, no 2 (8 mars 2016) : 184–99. http://dx.doi.org/10.1111/jpy.12395.

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Polyakova, S. L., O. I. Davidovich, Yu A. Podunay et N. A. Davidovich. « Modification of the ESAW culture medium used for cultivation of marine diatoms ». Marine Biological Journal 3, no 2 (29 juin 2018) : 73–80. http://dx.doi.org/10.21072/mbj.2018.03.2.06.

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Experiments with clonal cultures of four pennate diatoms Haslea karadagensis, H. ostrearia, Pleurosigma sp. and Pseudo-nitzschia cf. seriata revealed that adding of sodium thiosulfate to the culture medium resulted in increase of algae growth rate. The highest, approximately two-fold, increase of the growth rate was observed in Pseudo-nitzschia cf. seriata, a member of the genus including toxicogenous species. Dependence of the algae growth rate on concentration of sodium thiosulfate was studied; optimal concentrations providing the highest growth rate were determined. Addition of ferrous-ammonium citrate or replacement of ferric chloride with ferrous-ammonium citrate did not affect the growth rate of the diatoms studied. For practical reasons, it is useful to prepare culture medium with the salinity of 36 ‰. Modified recipe of the ESAW medium is given.
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Lundholm, Nina, Stephen S. Bates, Keri A. Baugh, Brian D. Bill, Laurie B. Connell, Claude Léger et Vera L. Trainer. « CRYPTIC AND PSEUDO-CRYPTIC DIVERSITY IN DIATOMS-WITH DESCRIPTIONS OF PSEUDO-NITZSCHIA HASLEANA SP. NOV. AND P. FRYXELLIANA SP. NOV.1 ». Journal of Phycology 48, no 2 (19 mars 2012) : 436–54. http://dx.doi.org/10.1111/j.1529-8817.2012.01132.x.

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Hong, Zhuan, Qiliang Lai, Qiaoqi Luo, Simeng Jiang, Ruilin Zhu, Junrong Liang et Yahui Gao. « Sulfitobacter pseudonitzschiae sp. nov., isolated from the toxic marine diatom Pseudo-nitzschia multiseries ». International Journal of Systematic and Evolutionary Microbiology 65, Pt_1 (1 janvier 2015) : 95–100. http://dx.doi.org/10.1099/ijs.0.064972-0.

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A taxonomic study was carried out on bacterial strain H3T, which was isolated from the toxic marine diatom Pseudo-nitzschia multiseries. Cells of strain H3T were Gram-stain-negative, rod-shaped, non-motile and capable of reducing nitrate to nitrite, but not denitrification. Growth was observed at NaCl concentrations of 1–9 %, pH 6–12 and 10–37 °C. It was unable to degrade aesculin or gelatin. The dominant fatty acids (>10 %) were C18 : 1ω7c/ω6c (summed feature 8) and C16 : 0. The respiratory ubiquinone was Q10. The major lipids were phosphatidylethanolamine, phosphatidylglycerol, an aminolipid and one unknown lipid, and the minor lipids were two phospholipids and three unknown lipids. The G+C content of the chromosomal DNA was 61.7 mol%. 16S rRNA gene sequence comparison showed that strain H3T was related most closely to Sulfitobacter donghicola DSW-25T (97.3 % similarity) and levels of similarity with other species of the genus Sulfitobacter were 95.1–96.9 %. The mean (±sd) DNA–DNA hybridization value between strain H3T and Sulfitobacter donghicola DSW-25T was 18.0±2.25 %. The average nucleotide identity between strain H3T and Sulfitobacter donghicola DSW-25T was 70.45 %. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain H3T formed a separate clade close to the genus Sulfitobacter and was distinguishable from phylogenetically related species by differences in several phenotypic properties. On the basis of the phenotypic and phylogenetic data, strain H3T represents a novel species of the genus Sulfitobacter , for which the name Sulfitobacter pseudonitzschiae is proposed (type strain H3T = DSM 26824T = MCCC 1A00686T).
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Lundholm, Nina, et Øjvind Moestrup. « The marine diatom Pseudo-nitzschia galaxiae sp. nov. (Bacillariophyceae) : morphology and phylogenetic relationships ». Phycologia 41, no 6 (novembre 2002) : 594–605. http://dx.doi.org/10.2216/i0031-8884-41-6-594.1.

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von Dassow, Peter, Marta Mikhno, Isabella Percopo, Valentina Rubio Orellana, Víctor Aguilera, Gonzalo Álvarez, Michael Araya et al. « Diversity and toxicity of the planktonic diatom genus Pseudo-nitzschia from coastal and offshore waters of the Southeast Pacific, including Pseudo-nitzschia dampieri sp. nov. » Harmful Algae 130 (décembre 2023) : 102520. http://dx.doi.org/10.1016/j.hal.2023.102520.

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Thèses sur le sujet "Pseudo-nitzschia sp"

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Deléglise, Margot. « Suivi de la contamination des coquilles Saint-Jacques (Pecten maximus) par l'acide domoïque et exploration du rôle du microbiote dans sa décontamination ». Electronic Thesis or Diss., Brest, 2024. http://www.theses.fr/2024BRES0022.

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La coquille Saint-Jacques {Pecten maximus) fait figure d’exception parmi les organismes contaminés par l’acide domoïque du fait de sa longue rétention au sein de sa glande digestive. Bien que les interdictions de pêche en cas de contamination aient un impact économique important, le mécanisme sous-jacent à cette lente dépuration reste méconnu. Les objectifs de cette thèse ont donc été de i) examiner in situ la contamination de P. maximus en corrélation avec la présence de Pseudo-nitzschia spp. et d’acide domoïque dans l'eau afin d'identifier les diverses sources de contamination possibles, ii) étudier le lien entre la dépuration de l'acide domoïque et la taille de P. maximus, iii) explorer la piste des microorganismes pour accélérer la dépuration de l'acide domoïque dans la glande digestive de P. maximus. Une surveillance menée depuis 2011 dans la rade de Brest a mis en évidence l'importance des eaux de surface et de fond ainsi que la présence de Pseudo-nitzschia spp. et d'acide domoïque dans la contamination de P. maximus, identifiant ainsi trois scénarios de contamination. Une expérience de décontamination sur deux mois a révélé que les petites coquilles semblaint dépurer l'acide domoïque plus rapidement que les grandes. Des isolements bactériens effectués sur des individus contaminés ont révélés des différences avec d'autres espèces de bivalves considérés comme dépurateurs rapides. Bien que des souches bactériennes candidates aient été identifiées, aucune réduction de l'acide domoïque n'a été observée après exposition à toxine. Un transfert de microbiote de M. edulis a été réalisé vers P. maximus, montrant un transfert de souches bactériennes dans la glande digestive de P. maximus. En conclusion, ces travaux enrichissent la compréhension des diverses sources de contamination de P. maximus par l'acide domoïque, ainsi que des réponses de ce bivalve en fonction de sa taille face à cette toxine. Cette thèse offre des pistes qui pourraient permettre d'accélérer la dépuration de l'acide domoïque chez P. maximus
The King scallop {Pecten maximus) is an exception among domoic acid contaminated organisms, due to its long retention within the digestive gland. Although fishing bans in the event of contamination have a significant economie impact, the mechanism behind this slow depuration remains poorly understood. The aims of this thesis were therefore to i) examine in situ the contamination of P. maximus in correlation with the presence of Pseudo-nitzschia spp. and domoic acid in the water, to identify the various sources of contamination, ii) study the link between domoic acid depuration and P. maximus size, iii) explore the possibility of microorganisms accelerating the depuration of domoic acid in the digestive gland of P. maximus. Monitoring carried out since 2011 in the Bay of Brest has shown the importance of surface and bottom waters, as well as the presence of Pseudo-nitzschia spp. and domoic acid in P. maximus contamination, thus identifying three contamination scenarios. A two-month decontamination experiment revealed that smaller scallops seemed to depurate domoic acid faster than larger ones. Bacterial isolations from contaminated individuals revealed differences with other bivalve species considered to be rapid depurators. Although candidate bacterial strains were identified, no toxin reduction was observed after exposure to domoic acid. A transfer of microbiota from M. edulis to P. maximus was performed, showing a transfer of bacterial strains into the digestive gland of P. maximus. In conclusion, this work enriches our understanding of the various sources of domoic acid contamination of scallops, as well as the response of this bivalve to domoic acid according to its size. This thesis offers new insight for accelerating domoic acid depuration in Pecten maximus
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Actes de conférences sur le sujet "Pseudo-nitzschia sp"

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Bekova, Radoslava, et Bogdan Prodanov. « FOOD SPECTRUM OF THREE FISH SPECIES FROM THE MUGILIDAE FAMILY IN BRACKISH WATER ALONG THE BULGARIAN BLACK SEA COAST ». Dans 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/5.1/s20.025.

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The food spectrum of three fish species from the Mugilidae family in different age groups was studied. The samples were collected in 2019 - 2021 from the river estuaries and the coastal brackish lakes at the Bulgarian Black Sea coast. The research aims to establish the food spectrum of mullets and thus make a connection between food components. The results show that the predominant groups in the stomachs of the three mullet species are detritus, zoobenthos (Rissoa sp. And Trochammina inflate - 64.28%) and macrophytes (Cladophoraceae family - 53.14%). Several potential toxic species were also found: Amphora coffeaeformis, Pseudo-nitzschia delicatissima, Pseudonitzschia seriata, Prorocentrum cordatum, E. pyriformis, P. minimum, Protoperidinium crassipes. For the first time along the Bulgarian Black Sea coast, in the stomachs of mullet fish, the presence of particles (less than 2.5 cm) from the category "Artificial polymers" was observed. The most common in the stomachs of mullet are macrophytes of the family Ulvaceae - 45.5%; family Cladophoraceae - 35.5%; from phytoplankton - Navicula spp (97.09%); of zoobenthos: Nematoda g.sp. - 49.3% and Trochammina inflate - 32.3%.
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Hashemi, Nastaran. « Optofluidic Cytometry on a Chip ». Dans ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80538.

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The effects of global warming, pollution in river effluents, and changing ocean currents can be studied by characterizing variations in phytoplankton populations. We demonstrate the design and fabrication of a microflow cytometer for characterization of phytoplankton. Guided by chevron-shaped grooves on the top and bottom of a microfluidic channel, two symmetric sheath streams wrap around a central sample stream and hydrodynamically focus it in the center of the channel. The lasers are carefully chosen to provide excitation light close to the maximum absorbance wavelengths for the intrinsic fluorophores chlorophyll and phycoerythrin, and the excitation light is coupled to the flow cytometer through the use of an optical fiber. Fluorescence and light scatter are collected using two multimode optical fibers placed at 90-degree angles with respect to the excitation fiber. Light emerging from these collection fibers is directed through optical bandpass filters into photomultiplier tubes. The cytometer measured the optical and side scatter properties of Karenia b., Synechococcus sp., Pseudo-Nitzchia, Alexandrium, Nitzschia, and Thallassiosira pseudonana. The microflow cytometer proved sensitive enough to detect and characterize picoplankton with diameter approximately 1 μm and larger phytoplankton of up to 80 μm in length. The wide range in size discrimination coupled with detection of intrinsic fluorescent pigments suggests that this microflow cytometer will be able to distinguish different populations of phytoplankton on unmanned underwater vehicles. We also studied the effect of the sheath-to-sample flow-rate ratio on the light scatter and fluorescence of these marine microorganisms.
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