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https://www.readbyqxmd.com/read/28900271/transgenerational-exposure-of-north-atlantic-bivalves-to-ocean-acidification-renders-offspring-more-vulnerable-to-low-ph-and-additional-stressors
#1
Andrew W Griffith, Christopher J Gobler
While early life-stage marine bivalves are vulnerable to ocean acidification, effects over successive generations are poorly characterized. The objective of this work was to assess the transgenerational effects of ocean acidification on two species of North Atlantic bivalve shellfish, Mercenaria mercenaria and Argopecten irradians. Adults of both species were subjected to high and low pCO2 conditions during gametogenesis. Resultant larvae were exposed to low and ambient pH conditions in addition to multiple, additional stressors including thermal stress, food-limitation, and exposure to a harmful alga...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28894198/functional-modulation-of-lhcsr1-protein-from-physcomitrella-patens-by-zeaxanthin-binding-and-low-ph
#2
Alberta Pinnola, Matteo Ballottari, Ilaria Bargigia, Marcelo Alcocer, Cosimo D'Andrea, Giulio Cerullo, Roberto Bassi
Light harvesting for oxygenic photosynthesis is regulated to prevent the formation of harmful photoproducts by activation of photoprotective mechanisms safely dissipating the energy absorbed in excess. Lumen acidification is the trigger for the formation of quenching states in pigment binding complexes. With the aim to uncover the photoprotective functional states responsible for excess energy dissipation in green algae and mosses, we compared the fluorescence dynamic properties of the light-harvesting complex stress-related (LHCSR1) protein, which is essential for fast and reversible regulation of light use efficiency in lower plants, as compared to the major LHCII antenna protein, which mainly fulfills light harvesting function...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28858213/recreational-exposure-during-algal-bloom-in-carrasco-beach-uruguay-a-liver-failure-case-report
#3
Flavia Vidal, Daniela Sedan, Daniel D'Agostino, María Lorena Cavalieri, Eduardo Mullen, María Macarena Parot Varela, Cintia Flores, Josep Caixach, Dario Andrinolo
In January 2015, a 20-month-old child and her family took part in recreational activities at Carrasco and Malvín beaches (Montevideo, Uruguay). An intense harmful algae bloom (HAB) was developing along the coast at that time. A few hours after the last recreational exposure episode, the family suffered gastrointestinal symptoms which were self-limited except in the child's case, who was admitted to hospital in Uruguay with diarrhea, vomiting, fatigue, and jaundice. The patient had increased serum levels of liver enzymes and bilirubin and five days later presented acute liver failure...
August 31, 2017: Toxins
https://www.readbyqxmd.com/read/28801171/microorganisms-based-methods-for-harmful-algal-blooms-control-a-review
#4
REVIEW
Rui Sun, Pengfei Sun, Jianhong Zhang, Sofia Esquivel-Elizondo, Yonghong Wu
Harmful algal blooms (HABs) are a worldwide problem with numerous negative effects on water systems, which have prompted researchers to study applicable measures to inhibit and control them. This review summarized the current microorganisms-based methods or technologies aimed at controlling HABs. Based on their characteristics, these methods can be divided into two categories: methods based on single-species microorganisms and methods based on microbial aggregates, and four types: methods for rapid decrease of algal cells density (e...
August 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28800687/the-profound-effect-of-harmful-cyanobacterial-blooms-from-food-web-and-management-perspectives
#5
Sigitas Šulčius, Danguolė Montvydienė, Hanna Mazur-Marzec, Jūratė Kasperovičienė, Rokas Rulevičius, Živilė Cibulskaitė
Sustainable and effective water management plans must have a reliable risk assessment strategies for harmful cyanobacterial blooms (HABs) that would enable timely decisions to be made, thus avoiding the trespassing of ecological thresholds, leading to the collapse of ecosystem structure and function. Such strategies are usually based on cyanobacterial biomass and/or on the monitoring of known toxins, which may, however, in many cases, under- or over-represent the actual toxicity of the HAB. Therefore, in this study, by the application of growth-inhibition assays using different bacteria, algae, zooplankton and fish species, we assessed the toxicological potential of two cyanobacterial blooms that differed in total cyanobacterial biomass, species composition and cyanopeptide profiles...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28793401/removal-of-phenanthrene-from-coastal-waters-by-green-tide-algae-ulva-prolifera
#6
Cui Zhang, Jian Lu, Jun Wu, Yongming Luo
Ulva prolifera (U. prolifera) has been frequently involved in terrible algal proliferation in coastal areas. Although it is known to be associated with green tide, its contribution to the natural attenuation of the polycyclic aromatic hydrocarbons (PAHs) in seawater has not been evaluated. In this study, the removal of phenanthrene using U. prolifera collected from coastal water with green tide blooming was investigated. The results showed that phenanthrene could be removed efficiently in the presence of both the live and heat-killed U...
December 31, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28783131/algicidal-activity-of-bacillamide-alkaloids-and-their-analogues-against-marine-and-freshwater-harmful-algae
#7
Bo Wang, Yuanyuan Tao, Qisheng Liu, Na Liu, Zhong Jin, Xiaohua Xu
Harmful algal blooms have become a great challenge to global aquatic ecosystems over the past decades. Given their low toxicity, high selectivity, and environment-friendly properties, the use of natural products and their analogues as algicides has proven to be particularly efficient. In the present study, algicidal activity of naturally occurring bacillamides A-C, alkaloid (1), and neobacillamide A, as well as their synthetic analogues were investigated intensively. Bioassay results showed that, relative to natural bacillamide alkaloids, aniline-derived analogue (10d) exhibited higher algicidal potential against three freshwater harmful algae Mycrocyctis aeruginosa, Scenedesmus obliquus, and Chlorella pyrenoidosa, suggesting that it could be used as a promising lead compound to develop novel algicide for controlling harmful algal blooms...
August 7, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28777959/fast-growing-algicidal-streptomyces-sp-u3-and-its-potential-in-harmful-algal-bloom-controls
#8
Xiaoqi Yu, Guanjing Cai, Hui Wang, Zhong Hu, Wei Zheng, Xueqian Lei, Xiaoying Zhu, Yao Chen, Qiuliang Chen, Hongyan Din, Hong Xu, Yun Tian, Lijun Fu, Tianling Zheng
To find the potential algicidal microorganisms and apply them to prevent and terminate harmful algal blooms (HABs), we isolated an actinomycete U3 from Mangrove, which had a potent algicidal effect on the harmful alga Heterosigma akashiwo. It could completely lyse the algal cells by producing active compounds, which were highly sensitive to high temperature and strong alkaline, but resistant to acid. One μg/mL of crude extract of the fermentation supernatant could kill 70% of H. akashiwo cells in 3 d. Unlike most of the other known algicidal Streptomyces, U3 showed strong ability of proliferation with the algal inclusion as the nutrient source...
June 23, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28770671/marine-algae-as-attractive-source-to-skin-care
#9
Jean-Yves Berthon, Rachida Nachat-Kappes, Mathieu Bey, Jean-Paul Cadoret, Isabelle Renimel, Edith Filaire
As the largest organ in the human body, the skin has multiple functions of which one of the most important is the protection against various harmful stressors. The keratinised stratified epidermis and an underlying thick layer of collagen-rich dermal connective tissues are important components of the skin. The environmental stressors such as ultraviolet radiation (UVR) and pollution increase the levels of reactive oxygen species (ROS), contributing to clinical manifestations such as wrinkle formation and skin aging...
June 2017: Free Radical Research
https://www.readbyqxmd.com/read/28755712/biogeography-of-bloom-forming-microcystin-producing-and-non-toxigenic-populations-of-dolichospermum-lemmermannii-cyanobacteria
#10
Camilla Capelli, Andreas Ballot, Leonardo Cerasino, Alessio Papini, Nico Salmaso
In the last decades, the cyanobacterium Dolichospermum lemmermannii showed an increasing spread to Southern Europe, raising serious concerns due to its ability to produce cyanotoxins. The widening of its geographic distribution and the observation of strains showing high optimum temperature underline its ecological heterogeneity, suggesting the existence of different ecotypes. To investigate its biogeography, new isolates from different European water bodies, together with strains maintained by the Norwegian Institute for Water Research Culture Collection of Algae, were genetically characterised for the 16S rRNA gene and compared with strains obtained from public repositories...
July 2017: Harmful Algae
https://www.readbyqxmd.com/read/28754946/single-molecule-spectroscopy-of-lhcsr1-protein-dynamics-identifies-two-distinct-states-responsible-for-multi-timescale-photosynthetic-photoprotection
#11
Toru Kondo, Alberta Pinnola, Wei Jia Chen, Luca Dall'Osto, Roberto Bassi, Gabriela S Schlau-Cohen
In oxygenic photosynthesis, light harvesting is regulated to safely dissipate excess energy and prevent the formation of harmful photoproducts. Regulation is known to be necessary for fitness, but the molecular mechanisms are not understood. One challenge has been that ensemble experiments average over active and dissipative behaviours, preventing identification of distinct states. Here, we use single-molecule spectroscopy to uncover the photoprotective states and dynamics of the light-harvesting complex stress-related 1 (LHCSR1) protein, which is responsible for dissipation in green algae and moss...
August 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28721563/terrestrial-adaptation-of-green-algae-klebsormidium-and-zygnema-charophyta-involves-diversity-in-photosynthetic-traits-but-not-in-co2-acquisition
#12
Mattia Pierangelini, David Ryšánek, Ingeborg Lang, Wolfram Adlassnig, Andreas Holzinger
The basal streptophyte Klebsormidium and the advanced Zygnema show adaptation to terrestrialization. Differences are found in photoprotection and resistance to short-term light changes, but not in CO 2 acquisition. Streptophyte green algae colonized land about 450-500 million years ago giving origin to terrestrial plants. We aim to understand how their physiological adaptations are linked to the ecological conditions (light, water and CO2) characterizing modern terrestrial habitats. A new Klebsormidium isolate from a strongly acidic environment of a former copper mine (Schwarzwand, Austria) is investigated, in comparison to Klebsormidium cf...
July 18, 2017: Planta
https://www.readbyqxmd.com/read/28720836/calcifying-algae-maintain-settlement-cues-to-larval-abalone-following-algal-exposure-to-extreme-ocean-acidification
#13
Jennifer K O'Leary, James P Barry, Paul W Gabrielson, Laura Rogers-Bennett, Donald C Potts, Stephen R Palumbi, Fiorenza Micheli
Ocean acidification (OA) increasingly threatens marine systems, and is especially harmful to calcifying organisms. One important question is whether OA will alter species interactions. Crustose coralline algae (CCA) provide space and chemical cues for larval settlement. CCA have shown strongly negative responses to OA in previous studies, including disruption of settlement cues to corals. In California, CCA provide cues for seven species of harvested, threatened, and endangered abalone. We exposed four common CCA genera and a crustose calcifying red algae, Peyssonnelia (collectively CCRA) from California to three pCO2 levels ranging from 419-2,013 µatm for four months...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720348/safety-evaluation-of-a-novel-muramidase-for-feed-application
#14
J Lichtenberg, E Perez Calvo, K Madsen, T Østergaard Lund, F Kramer Birkved, S van Cauwenberghe, M Mourier, L Wulf-Andersen, A J M Jansman, R Lopez-Ulibarri
Safety evaluation of a muramidase produced by a Trichoderma reesei strain (safe lineage), expressing a muramidase gene isolated from Acremonium alcalophilum is presented. Intended use in feed of this enzyme is as digestive aid in broiler chickens. Muramidase 007, was non-mutagenic and non-clastogenic in vitro, and no adverse effects were observed in 90-day subchronic toxicity studies in rats at doses up to 1132 mg TOS/kg body weight/day. The enzyme did not exhibit, in vitro, skin, nor eye irritation potential...
July 15, 2017: Regulatory Toxicology and Pharmacology: RTP
https://www.readbyqxmd.com/read/28674930/trojan-horse-strategy-for-non-invasive-interference-of-clock-gene-in-the-oyster-crassostrea-gigas
#15
Laura Payton, Mickael Perrigault, Jean-Paul Bourdineaud, Anjara Marcel, Jean-Charles Massabuau, Damien Tran
RNA interference is a powerful method to inhibit specific gene expression. Recently, silencing target genes by feeding has been successfully carried out in nematodes, insects, and small aquatic organisms. A non-invasive feeding-based RNA interference is reported here for the first time in a mollusk bivalve, the pacific oyster Crassostrea gigas. In this Trojan horse strategy, the unicellular alga Heterocapsa triquetra is the food supply used as a vector to feed oysters with Escherichia coli strain HT115 engineered to express the double-stranded RNA targeting gene...
August 2017: Marine Biotechnology
https://www.readbyqxmd.com/read/28666381/the-evolution-of-hydrophobic-cell-wall-biopolymers-from-algae-to-angiosperms
#16
Karl J Niklas, Edward D Cobb, Antonio J Matas
The transition from an aquatic ancestral condition to a terrestrial environment exposed the first land plants to the desiccating effects of air and potentially large fluctuations in temperature and light intensity. To be successful, this transition necessitated metabolic, physiological, and morphological modifications, among which one of the most important was the capacity to synthesize hydrophobic extracellular biopolymers such as those found in the cuticular membrane, suberin, lignin, and sporopollenin, which collectively reduce the loss of water, provide barriers to pathogens, protect against harmful levels of UV radiation, and rigidify targeted cell walls...
June 29, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28659451/costs-and-benefits-of-maternally-inherited-algal-symbionts-in-coral-larvae
#17
Valérie F Chamberland, Kelly R W Latijnhouwers, Jef Huisman, Aaron C Hartmann, Mark J A Vermeij
Many marine invertebrates provide their offspring with symbionts. Yet the consequences of maternally inherited symbionts on larval fitness remain largely unexplored. In the stony coral Favia fragum (Esper 1797), mothers produce larvae with highly variable amounts of endosymbiotic algae, and we examined the implications of this variation in symbiont density on the performance of F. fragum larvae under different environmental scenarios. High symbiont densities prolonged the period that larvae actively swam and searched for suitable settlement habitats...
June 28, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28646154/investigation-of-the-removal-mechanism-of-antibiotic-ceftazidime-by-green-algae-and-subsequent-microbic-impact-assessment
#18
Ying Yu, Yangyang Zhou, Zhiliang Wang, Oscar Lopez Torres, Ruixin Guo, Jianqiu Chen
The present study provides an integrated view of algal removal of the antibiotic ceftazidime and its basic parent structure 7-aminocephalosporanic acid (7-ACA), including contribution analysis, bacteriostatic and aquatic toxic assessment and metabolite verification. 92.70% and 96.07% of the two target compounds was removed after the algal treatment, respectively. The algal removal can be separated into three steps: a rapid adsorption, a slow cell wall-transmission and the final biodegradation. Additionally, while ceftazidime demonstrated an excellent inhibitory effect on Escherichia coli, there was no bacteriostasis introduced after the algal treatment, which could avoid favoring the harmful selective pressure...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634473/toxic-effects-of-prodigiosin-secreted-by-hahella-sp-ka22-on-harmful-alga-phaeocystis-globosa
#19
Huajun Zhang, Hui Wang, Wei Zheng, Zhiyuan Yao, Yun Peng, Su Zhang, Zhong Hu, Zhen Tao, Tianling Zheng
Application of algicidal compounds secreted by bacteria is a promising and environmentally friendly strategy to control harmful algal blooms (HABs). Years ago prodigiosin was described as an efficient algicidal compound, but the details about the effect of prodigiosin on algal cells are still elusive. Prodigiosin shows high algicidal activity on Phaeocystis globosa, making it a potential algicide in HAB control. When P. globosa were treated with prodigiosin at 5 μg/mL, algae cells showed cytoplasmic hypervacuolization, chloroplast and nucleus rupture, flagella missing, and cell fracture, when observed by scanning electron microscope and transmission electron microscopy...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28624742/ionic-liquids-toxicity-on-fresh-water-microalgae-scenedesmus-quadricauda-chlorella-vulgaris-botryococcus-braunii-selection-criterion-for-use-in-a-two-phase-partitioning-bioreactor-tppbr
#20
Khurrum Shehzad Quraishi, Mohamad Azmi Bustam, Sooridarsan Krishnan, Noor Fathanah Aminuddin, Noraisyah Azeezah, Noraini Abd Ghani, Yoshimitsu Uemura, Jean Marc Lévêque
A promising method of Carbon dioxide (CO2) valorization is to use green microalgae photosynthesis to process biofuel. Two Phase Partitioning Bioreactors (TPPBR) offer the possibility to use non-aqueous phase liquids (NAPL) to enhance CO2 solubility; thus making CO2 available to maximize algae growth. This requires relatively less toxic hydrophobic Ionic Liquids (ILs) that comprise a new class of ionic compounds with remarkable physicochemical properties and thus qualifies them as NAPL candidates. This paper concerns the synthesis of ILs with octyl and butyl chains as well as different cations containing aromatic (imidazolium, pyridinium) and non-aromatic (piperidinum, pyrrolidinium) rings for CO2 absorption studies...
October 2017: Chemosphere
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