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https://www.readbyqxmd.com/read/29331919/removal-of-pharmaceutical-pollutants-from-synthetic-wastewater-using-chemically-modified-biomass-of-green-alga-scenedesmus-obliquus
#1
Mohamed E M Ali, Azza M Abd El-Aty, Mohamed I Badawy, Rizka K Ali
Pharmaceutical compounds are considered emerging environmental pollutants that have a potential harmful impact on environment and human health. In this study, the biomass of alga (Scenedesmus obliquus) was modified using alkaline solution, and used for the biosorption of tramadol (TRAM) and other pharmaceuticals. The adsorption kinetics and isotherms were investigated. The obtained results reveal high adsorption capacity of tramadol over modified algal biomass (MAB) after 45min with removal percentage of 91%...
January 11, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29306666/surface-modified-tio2-floating-photocatalyst-with-pdda-for-efficient-adsorption-and-photocatalytic-inactivation-of-microcystis-aeruginosa
#2
Xin Wang, Xuejiang Wang, Jianfu Zhao, Jingke Song, Chenliang Su, Zhongchang Wang
Microcystis aeruginosa, as the most common cyanobacteria, often grows uncontrollably in eutrophic lakes with the accumulation of microcystin-LR (MC-LR) in water, which heavily pollutes water and hence imposes tremendous threat to aquatic animals and human beings. To remediate the harmful algae polluted water, here we synthesize a series of poly dimethyl diallyl ammonium chloride (PDDA) modified TiO2 floating photocatalysts, PDDA@NPT-EGC, and apply them as a visible light driven multifunctional material. The fabricated PDDA@NPT-EGC composites have a worm-like structure with PDDA particles distributed on their surfaces, and the concentration of PDDA can affect the agglomerative condition and distribution of PDDA particles and the photoelectric properties of catalysts...
December 27, 2017: Water Research
https://www.readbyqxmd.com/read/29306396/variable-allelopathy-among-phytoplankton-reflected-in-red-tide-metabolome
#3
Remington X Poulin, Kelsey L Poulson-Ellestad, Jessie S Roy, Julia Kubanek
Harmful algae are known to utilize allelopathy, the release of compounds that inhibit competitors, as a form of interference competition. Competitor responses to allelopathy are species-specific and allelopathic potency of producing algae is variable. In the current study, the biological variability in allelopathic potency was mapped to the underlying chemical variation in the exuded metabolomes of five genetic strains of the red tide dinoflagellate Karenia brevis using 1H nuclear magnetic resonance (NMR) spectroscopy...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29306391/growth-suppressing-and-algicidal-properties-of-an-extract-from-arundo-donax-an-invasive-riparian-plant-against-prymnesium-parvum-an-invasive-harmful-alga
#4
Reynaldo Patiño, Rakib H Rashel, Amede Rubio, Scott Longing
This study examined the ability of acidic and neutral/alkaline fractions of a methanolic extract from giant reed (Arundo donax) and of two of its constituents, gramine and skatole, to inhibit growth of the ichthyotoxic golden alga (Prymnesium parvum) in batch culture. For this study, growth suppression was defined as inhibition of maximum cell density, algicidal activity as early occurrence of negative growth, and algistatic activity as lack of net growth. The acidic fraction did not affect algal growth. The neutral/alkaline fraction showed growth-suppressing and algicidal activities but no signs of algistatic activity - namely, cells in cultures surviving a partial-algicidal exposure concentration (causing transient negative growth) were later able to initiate positive growth but at higher concentrations, algicidal activity was full and irreversible...
January 2018: Harmful Algae
https://www.readbyqxmd.com/read/29277080/cyanobacterium-removal-and-control-of-algal-organic-matter-aom-release-by-uv-h2o2-pre-oxidation-enhanced-fe-ii-coagulation
#5
Peili Jia, Yanping Zhou, Xufeng Zhang, Yi Zhang, Ruihua Dai
Harmful algal blooms in source water are a worldwide issue for drinking water production and safety. UV/H2O2, a pre-oxidation process, was firstly applied to enhance Fe(II) coagulation for the removal of Microcystis aeruginosa [M. aeruginosa, 2.0 (±0.5) × 106 cell/mL] in bench scale. It significantly improved both algae cells removal and algal organic matter (AOM) control, compared with UV irradiation alone (254 nm UVC, 5.4 mJ/cm2). About 94.7% of algae cells were removed after 5 min UV/H2O2 pre-treatment with H2O2 dose 375 μmol/L, FeSO4 coagulation (dose 125 μmol/L)...
December 11, 2017: Water Research
https://www.readbyqxmd.com/read/29204675/resting-stage-of-plankton%C3%A2-diversity-from-singapore%C3%A2-coastal-water-implications-for-harmful-algae-blooms-and-coastal-management
#6
Aurore Trottet, Bryan Wilson, Genevieve Sew Wei Xin, Christaline George, Lemuel Casten, Claire Schmoker, Nurul Syazana Binte Modh Rawi, Moon Chew Siew, Ole Larsen, Hans S Eikaas, Karenne Tun, Guillaume Drillet
Resting strategies of planktonic organisms are important for the ecological processes of coastal waters and their impacts should be taken into consideration in management of water bodies used by multiple industries. We combined different approaches to evaluate the importance of resting stages in Singapore coastal waters. We used molecular approaches to improve the knowledge on Singapore biodiversity, we sampled and extracted cysts from sediments to evaluate the density of resting stages in Johor Strait, and we compared systematically information on Singapore planktonic biodiversity to existing published information on resting stages from these reported organisms...
December 4, 2017: Environmental Management
https://www.readbyqxmd.com/read/29169569/effects-of-modified-clay-on-the-physiological-and-photosynthetic-activities-of-amphidinium-carterae-hulburt
#7
Shuya Liu, Zhiming Yu, Xiuxian Song, Xihua Cao
Among the strategies for treating harmful algal blooms, flocculation using modified clay (MC) has been widely applied in the field. This paper studied the mitigation of MC on Amphidinium carterae Hulburt, finding that MC could not only effectively remove A. carterae, but also affect the physiological activities of the residual algae and inhibit their normal growth. The superoxide dismutase (SOD) activity, catalase (CAT) activity and malondialdehyde (MDA) content of the residual algae significantly increased compared with the control, indicating that MC stimulated the accumulation of reactive oxygen species (ROS) in algal cells...
December 2017: Harmful Algae
https://www.readbyqxmd.com/read/29169236/aerosol-emissions-from-great-lakes-harmful-algal-blooms
#8
Nathaniel W May, Nicole E Olson, Mark G Panas, Jessica Lynne Axson, Peter S Tirella, Rachel M Kirpes, Rebecca Lynn Craig, Matthew J Gunsch, Swarup China, Alexander Laskin, Andrew P Ault, Kerri A Pratt
In freshwater lakes, harmful algal blooms (HABs) of Cyanobacteria (blue-green algae) produce toxins that impact human health. However, little is known about the lake spray aerosol (LSA) produced from wave-breaking in freshwater HABs. In this study, LSA were produced in the laboratory from freshwater samples collected from Lake Michigan and Lake Erie during HAB and non-bloom conditions. The incorporation of biological material within the individual HAB-influenced LSA particles was examined by single-particle mass spectrometry, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and fluorescence microscopy...
November 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29156332/effective-flocculation-of-microcystis-aeruginosa-with-simultaneous-nutrient-precipitation-from-hydrolyzed-human-urine
#9
Yan-Shan Wang, Zhong-Hua Tong, Long-Fei Wang, Guo-Ping Sheng, Han-Qing Yu
Mechanical harvest of massive harmful algal blooms is an effective measure for bloom mitigation. Yet subsequent processing of the resulting water from algae water separation after the harvesting becomes a new problem since individual algal cells or small algal aggregates are still present in the water. Here, we proposed a novel approach for effectively flocculating the cyanobacteria Microcystis aeruginosa with a removal efficiency of 97% in 6 h using hydrolyzed urine. Nitrogen and phosphorus were simultaneously reclaimed through struvite formation...
November 11, 2017: Chemosphere
https://www.readbyqxmd.com/read/29133868/from-harmful-microcystis-blooms-to-multi-functional-core-double-shell-microsphere-bio-hydrochar-materials
#10
Lei Bi, Gang Pan
Harmful algal blooms (HABs) induced by eutrophication is becoming a serious global environmental problem affecting public health and aquatic ecological sustainability. A novel strategy for the utilization of biomass from HABs was developed by converting the algae cells into hollow mesoporous bio-hydrochar microspheres via hydrothermal carbonization method. The hollow microspheres were used as microreactors and carriers for constructing CaO2 core-mesoporous shell-CaO2 shell microspheres (OCRMs). The CaO2 shells could quickly increase dissolved oxygen to extremely anaerobic water in the initial 40 min until the CaO2 shells were consumed...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29132031/effects-of-microcystis-on-development-of-early-life-stage-japanese-medaka-oryzias-latipes-comparative-toxicity-of-natural-blooms-cultured-microcystis-and-microcystin-lr
#11
Spencer R Saraf, Amy Frenkel, Matthew J Harke, Jennifer G Jankowiak, Christopher J Gobler, Anne E McElroy
Freshwater cyanobacterial harmful algal blooms (CyanoHABs) caused by algae in the genus Microcystis have been increasing in frequency and severity in recent decades. Microcystis blooms threaten aquatic organisms through effects associated with the rapid increase of biomass and the production of the hepatotoxin microcystin (MC) by toxic strains. Among fish, effects of blooms are likely to be more severe for early life stages, and physiological impacts on this life stage could significantly impact recruitment and fish populations...
November 2, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29110066/ecological-patterns-among-bacteria-and-microbial-eukaryotes-derived-from-network-analyses-in-a-low-salinity-lake
#12
Adriane Clark Jones, K David Hambright, David A Caron
Microbial communities are comprised of complex assemblages of highly interactive taxa. We employed network analyses to identify and describe microbial interactions and co-occurrence patterns between microbial eukaryotes and bacteria at two locations within a low salinity (0.5-3.5 ppt) lake over an annual cycle. We previously documented that the microbial diversity and community composition within Lake Texoma, southwest USA, were significantly affected by both seasonal forces and a site-specific bloom of the harmful alga, Prymnesium parvum...
November 7, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/29095808/harmful-algal-bloom-associated-illnesses-in-humans-and-dogs-identified-through-a-pilot-surveillance-system-new-york-2015
#13
Mary Figgatt, James Hyde, David Dziewulski, Eric Wiegert, Scott Kishbaugh, Grant Zelin, Lloyd Wilson
Cyanobacteria, also known as blue-green algae, are photosynthetic, aquatic organisms found in fresh, brackish, and marine water around the world (1). Rapid proliferation and accumulation of potentially toxin-producing cyanobacteria characterize one type of harmful algal bloom (HAB). HABs have the potential to cause illness in humans and animals (2,3); however, the epidemiology of these illnesses has not been well characterized. Statewide in 2015, a total of 139 HABs were identified in New York, 97 (70%) of which were confirmed through laboratory analysis; 77 independent beach closures were ordered at 37 beaches on 20 different bodies of water...
November 3, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/29080566/removal-efficiency-of-different-gemini-surfactants-and-related-modified-clay-to-chattonella-marina
#14
Wen-Wen Wang, Xin-Ya Yan, Yun-Hui Li, De-Ren Yu, Hong-Ye Li, Wei-Dong Yang, Jie-Sheng Liu
  To obtain new modified clays with excellent algae removal efficiency, three gemini surfactants including ethylene bis (dodecyl dimethyl ammonium chloride), ethylene bis (octadecyl dimethyl ammonium chloride) and ethylene bis (dodecyl dimethyl ammonium bromide) (EDAB), and a poly quaternary ammonium salt, poly dimethyl diallyl ammonium chloride, were screened with Chattonella marina. The four chemicals all exhibited high removal efficiencies against C. marina, with EDAB achieving the highest. A series of organ-clays with different ratios of EDAB were prepared, and the associated removal efficiencies were evaluated...
November 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/29075240/nprr-nprx-quorum-sensing-system-regulates-the-algicidal-activity-of-bacillus-sp-strain-s51107-against-bloom-forming-cyanobacterium-microcystis-aeruginosa
#15
Lishuang Wu, Xingliang Guo, Xianglong Liu, Hong Yang
Harmful cyanobacterial blooms have severely impaired freshwater quality and threatened human health worldwide. Here, a Gram-positive bacterium, Bacillus sp. strain S51107, which exhibits strong algicidal activity against Microcystis aeruginosa, was isolated from Lake Taihu. We found that the algicidal activity of strain S51107 was regulated primarily by NprR-NprX quorum sensing (QS), in which the mature form of the signaling peptide NprX was identified as the SKPDIVG heptapeptide. Disruption of the nprR-nprX cassette markedly decreased the algicidal activity, and complemented strains showed significantly recovered algicidal activity...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29067573/iron-uptake-and-storage-in-the-hab-dinoflagellate-lingulodinium-polyedrum
#16
Kyoko Yarimizu, Ricardo Cruz-López, Hendrik Auerbach, Larissa Heimann, Volker Schünemann, Carl J Carrano
The iron uptake and storage systems of terrestrial/higher plants are now reasonably well understood with two basic strategies being distinguished: Strategy I involves the induction of an Fe(III)-chelate reductase (ferrireductase) along with Fe(II) or Fe(III) transporter proteins while strategy II plants have evolved sophisticated systems based on high-affinity, iron specific, binding compounds called phytosiderophores. In contrast, there is little knowledge about the corresponding systems in marine, plant-like lineages...
October 24, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/29051014/furan-fatty-acids-beneficial-or-harmful-to-health
#17
REVIEW
Long Xu, Andrew J Sinclair, Muniba Faiza, Daoming Li, Xianlin Han, Huiyong Yin, Yonghua Wang
Furan fatty acids are found in plants, algae, and fish, and reported to have some positive health benefits, including anti-oxidant and anti-inflammatory activities, and inhibition of non-enzymatic lipid peroxidation. A major metabolite of furan fatty acids, 3-carboxy-4-methyl-5-propyl-2-furanpropanoic acid (CMPF), has been reported to be increased in patients who progress from prediabetes to type 2 diabetes, although CMPF is not necessarily associated with impaired glucose metabolism. Other studies report that CMPF levels are lower in subjects with diabetes than control subjects...
October 2017: Progress in Lipid Research
https://www.readbyqxmd.com/read/29031804/transcriptional-response-after-exposure-to-domoic-acid-producing-pseudo-nitzschia-in-the-digestive-gland-of-the-mussel-mytilus-galloprovincialis
#18
Antonio J Pazos, Pablo Ventoso, Roi Martínez-Escauriaza, M Luz Pérez-Parallé, Juan Blanco, Juan C Triviño, José L Sánchez
Bivalve molluscs are filter feeding species that can accumulate biotoxins in their body tissues during harmful algal blooms. Amnesic Shellfish Poisoning (ASP) is caused by species of the diatom genus Pseudo-nitzschia, which produces the toxin domoic acid. The Mytilus galloprovincialis digestive gland transcriptome was de novo assembled based on the sequencing of 12 cDNA libraries, six obtained from control mussels and six from mussels naturally exposed to domoic acid-producing diatom Pseudo-nitzschia australis...
October 12, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28968590/evaluation-of-constraints-to-water-quality-improvements-in-the-western-lake-erie-basin
#19
Lawrence Sekaluvu, Lefei Zhang, Margaret Gitau
Severe environmental and health impacts have been experienced in the Western Lake Erie Basin (WLEB) because of eutrophication and associated proliferation of harmful algae blooms. Efforts to improve water quality within the WLEB have been on-going for several decades. However, water quality improvements in the basin have not been realized as anticipated. In this study, factors affecting water quality within the WLEB were evaluated with a view to differentiating their impacts and informing further assessments in the basin...
January 1, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/28962989/applicability-of-massively-parallel-sequencing-on-monitoring-harmful-algae-at-varna-bay-in-the-black-sea
#20
Nina Dzhembekova, Shingo Urusizaki, Snejana Moncheva, Petya Ivanova, Satoshi Nagai
In this study the plankton diversity in 13 environmental samples from Varna Bay (in the western Black Sea) was analyzed using massively parallel sequencing (MPS). This preliminary study was undertaken to assess the potential of this technology for future implementation in monitoring programs in the Black Sea. Amplicon sequences of the 18S rRNA gene (V4-5 regions) were obtained using the Illumina MiSeq 250PE platform. A total of 1137 operational taxonomic units (OTUs) were obtained among which 242 OTUs with >0...
September 2017: Harmful Algae
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