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https://www.readbyqxmd.com/read/28634473/toxic-effects-of-prodigiosin-secreted-by-hahella-sp-ka22-on-harmful-alga-phaeocystis-globosa
#1
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
#2
Khurrum Shehzad Quraish, 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...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28615697/remodeling-of-the-cycling-transcriptome-of-the-oyster-crassostrea-gigas-by-the-harmful-algae-alexandrium-minutum
#3
Laura Payton, Mickael Perrigault, Claire Hoede, Jean-Charles Massabuau, Mohamedou Sow, Arnaud Huvet, Floriane Boullot, Caroline Fabioux, Hélène Hegaret, Damien Tran
As a marine organism, the oyster Crassostrea gigas inhabits a complex biotope governed by interactions between the moon and the sun cycles. We used next-generation sequencing to investigate temporal regulation of oysters under light/dark entrainment and the impact of harmful algal exposure. We found that ≈6% of the gills' transcriptome exhibits circadian expression, characterized by a nocturnal and bimodal pattern. Surprisingly, a higher number of ultradian transcripts were also detected under solely circadian entrainment...
June 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28604648/prevalence-variability-and-bioconcentration-of-saxitoxin-group-in-different-marine-species-present-in-the-food-chain
#4
Javiera Oyaneder Terrazas, Héctor R Contreras, Carlos García
The saxitoxin-group (STX-group) corresponds to toxic metabolites produced by cyanobacteria and dinoflagellates of the genera Alexandrium, Gymnodinium, and Pyrodinium. Over the last decade, it has been possible to extrapolate the areas contaminated with the STX-group worldwide, including Chile, a phenomenon that has affected ≈35% of the Southern Pacific coast territory, generating a high economic impact. The objective of this research was to study the toxicity of the STX-group in all aquatic organisms (bivalves, algae, echinoderms, crustaceans, tunicates, cephalopods, gastropods, and fish) present in areas with a variable presence of harmful algal blooms (HABs)...
June 12, 2017: Toxins
https://www.readbyqxmd.com/read/28602754/detection-and-quantification-of-the-toxic-microalgae-karenia-brevis-using-lab-on-a-chip-mrna-sequence-based-amplification
#5
Christos-Moritz Loukas, Jonathan S McQuillan, Florian Laouenan, Maria-Nefeli Tsaloglou, Jesus M Ruano-Lopez, Matthew C Mowlem
Now and again, the rapid proliferation of certain species of phytoplankton can give rise to Harmful Algal Blooms, which pose a serious threat to marine life and human health. Current methods of monitoring phytoplankton are limited by poor specificity or by the requirement to return samples to a highly resourced, centralised lab. The Lab Card is a small, microfluidic cassette which, when used in tandem with a portable Lab Card Reader can be used to sensitively and specifically quantify harmful algae in the field, from nucleic acid extracts using RNA amplification; a sensitive and specific method for the enumeration of potentially any species based on their unique genetic signatures...
June 8, 2017: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/28602251/analysis-of-sterols-in-selected-bloom-forming-algae-in-china
#6
Hui-Xia Geng, Ren-Cheng Yu, Zhen-Fan Chen, Quan-Cai Peng, Tian Yan, Ming-Jiang Zhou
Sterols, a group of stable lipid compounds, are often used as biomarkers in marine biogeochemical studies to indicate sources of organic matter. In this study, sterols in 13 species of major bloom-forming algae in China, which belong to Dinophyceae, Bacillariophyceae, Ulvophyceae, and Pelagophyceae, were analyzed with gas chromatography-mass spectrometry (GC-MS) to test their feasibility in representing different types of harmful algal blooms (HABs). It was found that (24Z)-stigmasta-5,24-dien-3β-ol (28-isofucosterol) was a major sterol component in green-tide forming macroalga Ulva prolifera...
June 2017: Harmful Algae
https://www.readbyqxmd.com/read/28554051/selenium-accumulation-and-metabolism-in-algae
#7
REVIEW
Michela Schiavon, Andrea Ertani, Sofia Parrasia, Francesca Dalla Vecchia
Selenium (Se) is an intriguing element because it is metabolically required by a variety of organisms, but it may induce toxicity at high doses. Algae primarily absorb selenium in the form of selenate or selenite using mechanisms similar to those reported in plants. However, while Se is needed by several species of microalgae, the essentiality of this element for plants has not been established yet. The study of Se uptake and accumulation strategies in micro- and macro-algae is of pivotal importance, as they represent potential vectors for Se movement in aquatic environments and Se at high levels may affect their growth causing a reduction in primary production...
May 25, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28527741/reeling-in-the-damages-harmful-algal-blooms-impact-on-lake-erie-s-recreational-fishing-industry
#8
David Wolf, Will Georgic, H Allen Klaiber
Lake Erie is one of the most valuable natural resources in the United States, providing billions of dollars in benefits each year to recreationalists, homeowners and local governments. The ecosystem services provided by Lake Erie, however, are under threat due to harmful algal blooms. This paper provides recreational damage estimates using spatially and temporally varying algae measures and monthly fishing permit sales collected between 2011 and 2014. Results indicate that fishing license sales drop between 10% and 13% when algal conditions surpass the World Health's Organization's moderate health risk advisory threshold of 20,000 cyanobacteria cells/mL...
September 1, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28527138/application-of-hyper-branched-rolling-circle-amplification-hrca-and-hrca-based-strip-test-for-the-detection-of-chattonella-marina
#9
Xiaoli Nie, Chunyun Zhang, Yuanyuan Wang, Changlu Guo, Jin Zhou, Guofu Chen
Harmful algal blooms (HABs) are global threats to marine ecosystems, fisheries, and human health. Therefore, developing effective and accurate methods for identifying causative algae and monitoring seawater quality is urgent. However, traditional, microscopy-based methods are complex, inaccurate, and time-consuming. Here, we present a novel method for effective and sensitive detection of Chattonella marina using hyper-branched rolling circle amplification (HRCA) and HRCA-based strip test (HBST). The large subunit (LSU) ribosomal DNA (rDNA) D1-D2 region of C...
May 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28513574/transcriptional-and-physiological-responses-to-nutrient-loading-on-toxin-formation-and-photosynthesis-in-microcystis-aeruginosa-fachb-905
#10
Guotao Peng, Sijie Lin, Zhengqiu Fan, Xiangrong Wang
An important goal of understanding harmful algae blooms is to determine how environmental factors affect the growth and toxin formation of toxin-producing species. In this study, we investigated the transcriptional responses of toxin formation gene (mcyB) and key photosynthesis genes (psaB, psbD and rbcL) of Microcystis aeruginosa FACHB-905 in different nutrient loading conditions using real-time reverse transcription quantitative polymerase chain reaction (RT-qPCR). Three physio-biochemical parameters (malondialdehyde (MDA), superoxide dismutase (SOD) and glutathione (GSH)) were also evaluated to provide insight into the physiological responses of Microcystis cells...
May 17, 2017: Toxins
https://www.readbyqxmd.com/read/28513110/separation-and-purification-of-two-minor-typical-diarrhetic-shellfish-poisoning-toxins-from-harmful-marine-microalgae-via-combined-liquid-chromatography-with-mass-spectrometric-detection
#11
Junhui Chen, Yanlong Wang, Lei Pan, Huihui Shen, Dan Fu, Boqiang Fu, Chengjun Sun, Li Zheng
A novel method was developed for the purification of two typical diarrhetic shellfish poisoning toxins from toxin-producing marine microalgae using macroporous resin, high-speed countercurrent chromatography-mass spectrometry, and semipreparative high-performance liquid chromatography-mass spectrometry. Analytical high-performance liquid chromatography-mass spectrometry was used for identification and purity analysis of okadaic acid and dinophysistoxin-1 because they exhibit no visible or ultraviolet absorption...
May 17, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28505885/occurrence-and-environmental-impact-of-pharmaceutical-residues-from-conventional-and-natural-wastewater-treatment-plants-in-gran-canaria-spain
#12
C Afonso-Olivares, Z Sosa-Ferrera, J J Santana-Rodríguez
The presence and fate of pharmaceutical residues in environmental samples are of great interest. There is a vast number of studies published regarding their input, presence, effects and risks in ecosystems. Moreover, it has been demonstrated that the primary source of input of these contaminants in the environment is from Wastewater Treatment Plants (WWTPs). It is therefore essential to evaluate the efficiency of commonly used treatments and the necessity of applying novel purification processes in order to eliminate or reduce the concentration of pharmaceuticals from wastewater or from the effluent of WWTPs...
December 1, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28464383/seasonal-changes-in-phosphorus-competition-and-allelopathy-of-a-benthic-microbial-assembly-facilitate-prevention-of-cyanobacterial-blooms
#13
Yonghong Wu, Fengwu Wang, Xi Xiao, Junzhuo Liu, Chenxi Wu, Hong Chen, Philip Kerr, Jonathan Shurin
Interactions among microbes determine the prevalence of harmful algal blooms that threaten water quality. These interactions can be indirectly mediated by shared resources or consumers, or through interference by the production of allelochemicals. Allelopathic interactions and resource competition have been shown to occur among algae and associated microbes. However, little work has considered seasonal influences on ecosystem structure and function. Here, we report results of our investigations on seasonal changes in the interactions between benthic microbial assemblies and the bloom forming cyanobacterium Microcystis aeruginosa...
May 2, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28454009/environmental-risk-assessment-of-effluents-as-a-whole-emerging-contaminant-efficiency-of-alternative-tertiary-treatments-for-wastewater-depuration
#14
B Díaz-Garduño, M G Pintado-Herrera, M Biel-Maeso, J J Rueda-Márquez, P A Lara-Martín, J A Perales, M A Manzano, C Garrido-Pérez, M L Martín-Díaz
Emerging contaminants (ECs) and regulated compounds (RCs) from three different WWTP effluents were measured in the current study. The efficiency of two tertiary treatments, Photobiotreatment (PhtBio) and Multi-Barrier Treatment (MBT), for removing contaminants was determined. Results indicated different percentages of removal depending on the treatment and the origin of the effluent. Risk Quotients (RQs) were determined for different species of algae, Daphnia, and fish. RQ results revealed diverse risk values depending on the bioindicator species...
April 10, 2017: Water Research
https://www.readbyqxmd.com/read/28439007/ocean-warming-since-1982-has-expanded-the-niche-of-toxic-algal-blooms-in-the-north-atlantic-and-north-pacific-oceans
#15
Christopher J Gobler, Owen M Doherty, Theresa K Hattenrath-Lehmann, Andrew W Griffith, Yoonja Kang, R Wayne Litaker
Global ocean temperatures are rising, yet the impacts of such changes on harmful algal blooms (HABs) are not fully understood. Here we used high-resolution sea-surface temperature records (1982 to 2016) and temperature-dependent growth rates of two algae that produce potent biotoxins, Alexandrium fundyense and Dinophysis acuminata, to evaluate recent changes in these HABs. For both species, potential mean annual growth rates and duration of bloom seasons significantly increased within many coastal Atlantic regions between 40°N and 60°N, where incidents of these HABs have emerged and expanded in recent decades...
May 9, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28434665/eutrophication-harmful-algae-and-biodiversity-challenging-paradigms-in-a-world-of-complex-nutrient-changes
#16
Patricia M Glibert
Eutrophication is a complex process and often associated with not only a change in overall algal biomass but also with a change in biodiversity. Common metrics of eutrophication (e.g., chlorophyll a), total nitrogen (TN) and phosphorus (TP) are not adequate for understanding biodiversity changes, especially those associated with harmful algal bloom (HAB) proliferations. Harmful algae can increase disproportionately with eutrophication, depending on which nutrients change and in what proportion. This paper challenges several classic paradigms in our understanding of eutrophication and associated biodiversity changes...
April 20, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28431762/effects-of-a-common-insecticide-on-wetland-communities-with-varying-quality-of-leaf-litter-inputs
#17
A B Stoler, B M Mattes, W D Hintz, D K Jones, L Lind, M S Schuler, R A Relyea
Chemical contamination of aquatic systems often co-occurs with dramatic changes in surrounding terrestrial vegetation. Plant leaf litter serves as a crucial resource input to many freshwater systems, and changes in litter species composition can alter the attributes of freshwater communities. However, little is known how variation in litter inputs interacts with chemical contaminants. We investigated the ecological effects resulting from changes in tree leaf litter inputs to freshwater communities, and how those changes might interact with the timing of insecticide contamination...
April 18, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28425963/a-multi-platform-optical-sensor-for-in-vivo-and-in-vitro-algae-classification
#18
Chee-Loon Ng, Qing-Qing Chen, Jia-Jing Chua, Harold F Hemond
Differentiation among major algal groups is important for the ecological and biogeochemical characterization of water bodies, and for practical management of water resources. It helps to discern the taxonomic groups that are beneficial to aquatic life from the organisms causing harmful algal blooms. An LED-induced fluorescence (LEDIF) instrument capable of fluorescence, absorbance, and scattering measurements; is used for in vivo and in vitro identification and quantification of four algal groups found in freshwater and marine environments...
April 20, 2017: Sensors
https://www.readbyqxmd.com/read/28388672/toxicity-of-benthic-dinoflagellates-on-grazing-behavior-and-survival-of-the-brine-shrimp-artemia-salina
#19
Raquel A F Neves, Tainá Fernandes, Luciano Neves Dos Santos, Silvia M Nascimento
Harmful algae may differently affect their primary grazers, causing sub-lethal effects and/or leading to their death. The present study aim to compare the effects of three toxic benthic dinoflagellates on clearance and grazing rates, behavioral changes, and survival of Artemia salina. Feeding assays consisted in 1-h incubations of brine shrimps with the toxic Prorocentrum lima, Gambierdiscus excentricus and Ostreopsis cf. ovata and the non-toxic Tetraselmis sp. Brine shrimps fed unselectively on all toxic and non-toxic algal preys, without significant differences in clearance and ingestion rates...
2017: PloS One
https://www.readbyqxmd.com/read/28384119/status-of-water-pollution-in-relation-to-industrialization-in-rajasthan
#20
Ritu Singh Rajput, Sonali Pandey, Seema Bhadauria
India is a large and densely populated country; its economy is largely agricultural. Making the best use of the country's manpower has always posed a challenge. Industrialization could become a dominant component of the economy and displace agriculture. Traditional livelihoods of occupational groups are threatened by the practice of disposing untreated industrial waste into rivers and bodies of water. These uncontrolled disposals impact local natural resources with negative long-term effects. Industrialization is the development of intellectual and financial trade that changes a predominantly rustic culture into a modern one...
April 6, 2017: Reviews on Environmental Health
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