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PubMed Journals Articles About "Important Process Fueling Harmful Algal Blooms Investigated Canadian" - Page: 2 RSS

03:28 EST 12th December 2018 | BioPortfolio

Important Process Fueling Harmful Algal Blooms Investigated Canadian PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Important Process Fueling Harmful Algal Blooms Investigated Canadian articles that have been published worldwide.

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Showing "important process fueling harmful algal blooms investigated Canadian" PubMed Articles 26–50 of 40,000+

Tolerance of Pseudochlorella pringsheimii to Cd and Pb stress: Role of antioxidants and biochemical contents in metal detoxification.

The tolerance and antioxidant response of the green alga P. pringsheimii to cadmium (Cd) and lead (Pb) was investigated. The algal biomass was constant at the relatively lower metal concentrations of Cd and Pb (5, 12 µM, and 2.5-200 µM, respectively), whereas higher concentrations severely inhibited the algal biomass yield. The pigment content of P. pringsheimii decreased due to the investigated metals, especially with Cd concentrations. However, the Pb concentrations of 2.5-200 µM enhanced the pig...


Rapid and sensitive detection of Amphidinium carterae by loop-mediated isothermal amplification combined with a chromatographic lateral-flow dipstick.

Frequent outbreaks of toxic algal blooms devastate marine ecosystems, marine fisheries, and public health. Monitoring toxic algae is crucial to reduce losses caused by imminent algal blooms. However, traditional detection techniques relying on morphological examination are tedious and time-consuming. Therefore, the development of convenient strategies to detect toxin-producing microalgae is necessary. In this study, a novel method for the rapid, sensitive detection of Amphidinium carterae by loop-mediated i...

Mechanistic consideration of the photochemical transformation of domoic acid (algal toxin) in DOM-Rich brackish water.

Domoic acid (DA) is a neurotoxin generated by several diatom species in harmful algae blooms (HABs). We report the photo-induced transformation products (TPs) and degradation mechanisms of DA in dissolved organic matter (DOM)-rich freshwater and brackish water. High-resolution quadrupole time-of-flight mass spectrometry (QTOF-MS) and the multivariate statistical strategy orthogonal partial least-squares discriminant analysis (OPLS-DA) identified 36 and 23 potential TPs in DOM-rich freshwater and brackish wa...


The inhibition of Microcystis aeruginos by electrochemical oxidation using boron-doped diamond electrode.

Electrooxidation is used to study the inhibition behavior of Microcystis aeruginosa, a dominant algae species during water blooms mainly caused by non-point source pollution. The inhibitory effect of current density, A/V ratio, initial algae concentration, and algae growth phase on the growth of algae by electrochemical oxidation was investigated, respectively. Further, the effect of electrolysis on the photosynthesis of algae cells and the degradation of Microcystin-LR (MC-LR) in solution were also studied...

Effects of Algal Morphology and Al Species Distribution on the Coagulation-Ultrafiltration Process.

In order to ensure drinking water quality, three different Al-based coagulants [Al(SO)(AS), Al, Al] were used to treat water laden with different algae [(cyanobacteria), (green algae), (diatoms)]. Floc size, strength factor, and recovery factor under different conditions were measured to investigate the mechanisms in the coagulation-ultrafiltration process. The results indicated that the main mechanism in the coagulation process using Al or Al as coagulants was electrostatic patching and the main mechanism...

Karenia brevis allelopathy compromises the lipidome, membrane integrity, and photosynthesis of competitors.

The formation, propagation, and maintenance of harmful algal blooms are of interest due to their negative effects on marine life and human health. Some bloom-forming algae utilize allelopathy, the release of compounds that inhibit competitors, to exclude other species dependent on a common pool of limiting resources. Allelopathy is hypothesized to affect bloom dynamics and is well established in the red tide dinoflagellate Karenia brevis. K. brevis typically suppresses competitor growth rather than being ac...

Microalgae cultivation and nutrients removal from sewage sludge after ozonizing in algal-bacteria system.

The feasibility of growing algae in concentrated wastewater generated from sludge ozonation for simultaneous nutrients removal and biomass production was studied. The effects of bacteria addition into microalgae on nutrients removal, biomass yield and settleability, the growth rate of algae and concentrations of extracellular polymeric substances (EPS) and soluble microbial products (SMP) were investigated. The results showed that the growth rate of algae in algal-bacteria system (0.2182) was improved than ...

Expression of novel nitrate reductase genes in the harmful alga, Chattonella subsalsa.

Eukaryotic nitrate reductase (NR) catalyzes the first step in nitrate assimilation and is regulated transcriptionally in response to external cues and intracellular metabolic status. NRs are also regulated post-translationally in plants by phosphorylation and binding of 14-3-3 proteins at conserved serine residues. 14-3-3 binding motifs have not previously been identified in algal NRs. A novel NR (NR2-2/2HbN) with a 2/2 hemoglobin domain was recently described in the alga Chattonella subsalsa. Here, a secon...

Response of algal-bacterial granular system to low carbon wastewater: Focus on granular stability, nutrients removal and accumulation.

The effect of influent chemical oxygen demand to nitrogen (COD/N) ratio on the granular stability, nutrients removal and accumulation of the algal-bacterial AGS was investigated. Two sequencing batch reactors were operated under different influent COD/N ratio, i.e., R (control, COD/N = 8) and R: (COD/N = 8, 4, 2, and 1 through stepwise decrease of COD). Results showed that the integrity coefficient of the granules in R stabilized at 0.7-5.4% during the whole operation. Significantly enhanced dissolv...

Canadian Anesthesia Incident Reporting System (CAIRS): The Canadian Anesthesiologists' Society's National Patient Safety Initiative.

Frequent solitary drinking mediates the associations between negative affect and harmful drinking in emerging adults.

Depression and anxiety are highly comorbid conditions that are associated with harmful drinking. Social learning theory proposes that depressed or anxious individuals learn that drinking can reduce negative affect, which makes them susceptible to harmful drinking. Consistent with theory, evidence suggests that negative affect increases risk for harmful drinking. But, less is known about mediators of negative affect-pathways to harmful drinking. Research has demonstrated that solitary drinking is an underlyi...

Spatiotemporal Succession Characteristics of Algal Functional Groups and Its Impact Factors for a Typical Channel-Type Reservoir in a Southwest Mountainous Area.

In order to explore the spatial and temporal variations of algal functional groups in the Zipingpu reservoir, a typical channel-type reservoir in the southwest mountainous area of China, water samples were collected from eight sections of the Zipingpu reservoir from April 2016 to March 2017.A total of 21 algal functional groups were identified as B, C, D, F, G, H, J, L, L, M, N, P, S, T, W, W, X, X, X, Y, and Z. Based on the analysis of the dominant degree ( > 0.02), the algal functional groups were dominat...

Formation kinetics of disinfection byproducts in algal-laden water during chlorination: A new insight into evaluating disinfection formation risk.

It is necessary and important to investigate the formation of disinfection byproducts (DBPs) in water treatment systems for the management of disinfection formation risk. In the present study, the formation potential of trichloromethane (TCM) and haloacetic acids in different algal metabolites were compared, and the formation kinetics of these DBPs were investigated. The results indicated that DBP formation potential, the traditional index widely used to evaluate the disinfection formation risk, can represe...

Using photocatalyst powder to enhance the coagulation and sedimentation of cyanobacterial cells and enable the sludge to be self-purified under visible light.

Removing harmful cyanobacteria intact by coagulation can prevent cell lysis and toxin release, which provides many benefits for drinking water production, including reduction of the burden on subsequent processes and guaranteeing the water quality. But the electronegativity and buoyancy of cyanobacterial cells make them settle slowly and their accumulation and concentration in flocs would still have severe adverse effects. In this study, we introduced a photocatalyst powder to act as a ballasting agent in t...

Microdevice-based solid-phase polymerase chain reaction for rapid detection of pathogenic microorganisms.

We demonstrate the integration of DNA amplification and detection functionalities developed on a lab-on-a-chip microdevice utilizing solid-phase polymerase chain reaction (SP-PCR) for point-of-need (PON) DNA analyses. First, the polycarbonate microdevice was fabricated by thermal bonding to contain microchambers as reservoirs for performing SP-PCR. Next, the microchambers were subsequently modified with polyethyleneimine and glutaraldehyde for immobilizing amine-modified forward primers. During SP-PCR, the ...

Biogeography of resistance to paralytic shellfish toxins in softshell clam, Mya arenaria (L.), populations along the Atlantic coast of North America.

Blooms of Alexandrium spp., the causative agent of paralytic shellfish poisoning (PSP), recur with varying frequency and intensity on the Northwest Atlantic coast of North America, from New York, USA, to northern Canadian waters. Along this latitudinal range blooms co-occur with abundant, intertidal populations of softshell clams, Mya arenaria. Prior work identified a naturally-occurring genetic mutation in Domain II α-subunit of the clams' voltage-gated sodium channels (Na), which significantly reduces th...

Simulation-based assessment of the impact of fertiliser and herbicide application on freshwater ecosystems at the Three Gorges Reservoir in China.

Dams have profound impacts on river ecosystems, amongst them inundation of land, altered dynamics of the water body or uprising reservoir backwaters influencing tributary or upstream river sections. Along the outstandingly ecologically important Yangtze River in China, the Three Gorges Reservoir (TGR) is the largest project, covering an area of 1080 km. From the beginning, the dam-project came in for criticism on increasing environmental risks due to sub-merging former industrial and urban areas. We simul...

Community Structure of Microorganisms and Its Seasonal Variation in Beihai Lake.

Water samples were collected in summer, autumn, winter, and spring in Beihai Lake for the analysis of water quality and microbial community structure. It was found that the water quality in summer and autumn was worse than in winter and spring, and TN and TP were the most important factors affecting the water quality. The microbial community structure was investigated using MiSeq high-throughput sequencing. It was found that the phyla Cyanobacteria, Proteobacteria, Actinobacteria, and Bacteroidetes were abu...

The effects of algal extracellular substances on algal growth, metabolism and long-term medium recycle, and inhibition alleviation through ultrasonication.

The algal extracellular substances (AESs), mainly excreted in the lag and stationary phases, inhibited the algal growth and culture recycle. The AESs consisted of protein-like substances and saccharides, which restrained the algal lipid and protein biosynthesis. Moreover, the increasing reactive oxygen species and anti-oxidative enzymes caused by AESs led to the oxidative damage and suppressed the cell activity. The AESs affected the cells through two possible ways: one is the AESs adhered to the cell surfa...

Assessing the effectiveness of Landsat 8 chlorophyll a retrieval algorithms for regional freshwater monitoring.

Predicting algal blooms has become a priority for scientists, municipalities, businesses, and citizens. Remote sensing offers solutions to the spatial and temporal challenges facing existing lake research and monitoring programs that rely primarily on high-investment, in situ measurements. Techniques to remotely measure chlorophyll a (chl a) as a proxy for algal biomass have been limited to specific large water bodies in particular seasons and narrow chl a ranges. Thus, a first step toward prediction of al...

Influence of parasitic chytrids on the quantity and quality of algal dissolved organic matter (AOM).

Algae-derived dissolved organic matter (AOM) is an important nutrient source for heterotrophic bacteria, while AOM such as humic substances pose significant challenges during water treatment processing. We hypothesized that the parasitic infection of algae could change the composition and concentration of AOM. This study investigated the quality and quantity of DOM and bacterial abundance in diatom (Synedra) cultures, with and without parasitic fungi (chytrids). The quality of DOM was analyzed using three-d...

Toxic effects of nickel oxide (NiO) nanoparticles on the freshwater alga Pseudokirchneriella subcapitata.

Over the last decade, concerns have been raised regarding the potential health and environmental effects associated with the release of metal oxide nanoparticles (NPs) into ecosystems. In the present work, the potential hazards of nickel oxide (NiO) NPs were investigated using the ecologically relevant freshwater alga Pseudokirchneriella subcapitata. NiO NP suspensions in algal OECD medium were characterized with regard to their physicochemical properties: agglomeration, surface charge, stability (dissoluti...

Effects of fungal-assisted algal harvesting through biopellet formation on pesticides in water.

Recent research has demonstrated the potential of using filamentous fungi to form pellets with microalgae (biopellets), in order to facilitate harvesting of microalgae from water following algae-based treatment of wastewater. In parallel, there is a need to develop techniques for removing organic pollutants such as pesticides and pharmaceuticals from wastewater. In experiments using the microalga Chlorella vulgaris, the filamentous fungus Aspergillus niger and biopellets composed of these microorganisms, th...

Genotoxicity and cytotoxicity of three microcystin-LR containing cyanobacterial samples from Antioquia, Colombia.

The presence of cyanobacterial blooms and cyanotoxins in water presents a global problem due to the deterioration of ecosystems and the possibility of poisoning in human and animals. Microcystin LR is the most widely distributed cyanotoxin and liver cells are its main target. In the present study, HepG2 cells were used to determine DNA damage of three crude extracts of cyanobacterial blooms containing MC-LR, through comet assay. The results show that all extracts at a concentration of 500 μg mL caused low ...

Dieting predicts engagement in multiple risky behaviours among adolescent Canadian girls: a longitudinal analysis.

We investigated associations between dieting and other health-compromising behaviours among adolescent girls, both cross-sectionally and longitudinally. The behaviours considered included smoking, binge drinking, and breakfast-skipping, and clusters of these.


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