Blue-Green Alga Microcystis aeruginosa Kütz. in Natural Medium

Kim, B. H.; Choi, M. K.; Chung, Yeun Tai; Lee, J. B.; Wui, In-Sun

doi:10.1007/s001289900440

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…A. borkumensis, which is commonly found in coastal and oceanic waters (Golyshin et al, 2003;Schneiker et al, 2006), was chosen to represent Gram-negative bacteria. M. aeruginosa, a toxic, unicellular, colony-forming, freshwater cyanobacteria, was chosen due to its unique cellular physiology, which exhibits characteristics of both Gram-positive and Gram-negative microorganisms (Kaneko et al, 2007) and thus cannot be easily classified as one or the other (Hoiczyk and Hansel, 2000;Kim et al, 1997).…”

Section: Biosensor Validation Using Laboratory-sourced Batch Culture mentioning

confidence: 99%

Rapid detection of microbial cell abundance in aquatic systems

Rocha

Yuan

et al. 2016

Biosensors and Bioelectronics

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The detection and quantification of naturally occurring microbial cellular densities is an essential component of environmental systems monitoring. While there are a number of commonly utilized approaches for monitoring microbial abundance, capacitance-based biosensors represent a promising approach because of their low-cost and label-free detection of microbial cells, but are not as well characterized as more traditional methods. Here, we investigate the applicability of enhanced alternating current electrokinetics (ACEK) capacitive sensing as a new application for rapidly detecting and quantifying microbial cellular densities in cultured and environmentally sourced aquatic samples. ACEK capacitive sensor performance was evaluated using two distinct and dynamic systems - the Great Australian Bight and groundwater from the Oak Ridge Reservation in Oak Ridge, TN. Results demonstrate that ACEK capacitance-based sensing can accurately determine microbial cell counts throughout cellular concentrations typically encountered in naturally occurring microbial communities (10(3)-10(6) cells/mL). A linear relationship was observed between cellular density and capacitance change correlations, allowing a simple linear curve fitting equation to be used for determining microbial abundances in unknown samples. This work provides a foundation for understanding the limits of capacitance-based sensing in natural environmental samples and supports future efforts focusing on evaluating the robustness ACEK capacitance-based within aquatic environments.

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Section: Biosensor Validation Using Laboratory-sourced Batch Culture mentioning

confidence: 99%

Rapid detection of microbial cell abundance in aquatic systems

Rocha

Yuan

et al. 2016

Biosensors and Bioelectronics

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“…If the additional transmembrane potential reaches and overruns a critical value (normally 1 V for biological lipid membrane), the membrane permeability increases to such a level that either the cell needs from seconds to hours to recover, or pores are generated in the membrane of sizes which allow the exchange of macromolecules and cell death may occur. Meanwhile, chemically active species, including OH•, H•, O•, O 3 and H 2 O 2 , intense UV radiation and over pressure shock waves could attack the cell membrane and wall, disrupt membrane integrity, or electrolyze the molecules in the cell surface, which made pores formed in the cytoplasmic membrane [35][36][37][38][39], and the cellular materials released from the cell, including Chl-a and the damaged cells split into many fragments.…”

Section: Change In the Cell Densitymentioning

confidence: 99%

Role of Bipolar Pulsed DBD on the Growth of Microcystis aeruginosa in Three-Phase Discharge Plasma Reactor

Wang

et al. 2006

Plasma Chem Plasma Process

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Algae in drinking water supplies often bring about impact on the water treatment. In this study, a bipolar pulsed dielectric barrier discharge system in threephase discharge plasma reactor was constructed for investigating its ability to control excessive growth of cyanobacteria, Microcystis aeruginosa. Experimental results show there was almost no change in optical density immediately after the interruption of electrical discharge, but the decreasing trend of optical density, cell density and chlorophyll-a content was obvious during the incubation period, indicating a significant residual effect of electrical discharge process on the algal growth inhibition. Scanning electron microscopy investigation of algae revealed surface damage, apparent leakage of intracellular contents and pores formed after electrical discharge process, which showed that algal cells had no potential to survive and grow. Compared with the control sample, it was observed that electrical discharge on the algal extracellular products has almost no residual effect and the growth rate of algae slightly decreased before three days storage. Hydrogen peroxide was produced by electrical discharge in the lM level and showed a first-order decay. But at such level, the external addition of hydrogen peroxide alone is not likely to cause the residual effect. These results implicated that the growth inhibition of M. aeruginosa was mainly caused by electrical discharge process, and it made the algal cells lose ability to survive, demonstrating the considerable potential of such an alternative process for efficient water purification.Keywords Bipolar pulsed dielectric barrier discharge AE Microcystis aeruginosa AE The residual effect AE Hydrogen peroxide

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“…It is one of more than 700 species of algae that may be found in water samples collected and usually blooms in mid to late summer. The extracellular covering of M. aeruginosa is divided into several layers: the cytoplasmic membrane or plasmalemma, the peptidoglycan layer, and the multilayered structure of the cell wall (Kim et al, 1997). These common bloom-forming algae are especially abundant in shallow, warm, nutrient enriched fresh waters and lower salinity estuaries.…”

Section: Microcystis Aeruginosamentioning

confidence: 99%

Antibacterial activity of freshwater microalgae: A review

Pradhan¹,

Das²,

Das³

2014

Afr. J. Pharm. Pharmacol.

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The photoautotrophic microorganisms collectively termed 'micro-algae' (including micro-eukaryotes and cyanobacteria) are known to produce a wide range of secondary metabolites with various biological actions. They are known as well for their richness in bioactive compounds, with promising applications in pharmaceutical formulations. Their cell-free extracts have accordingly been tested as additives for food and feed formulation, in attempts to circumvent use of antimicrobial compounds of synthetic origin, or subtherapeutical doses of regular antibiotics. The increased use of antibiotics and chemotherapeutants for disease treatment leads to emergence of drug resistant forms. It also adversely affects the ecosystem. Microalgae are rich source of antimicrobial agents and provide a safer and cost effective way of treating bacterial infections. This article describes the antibacterial properties of some freshwater microalgae like,

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Blue-Green Alga Microcystis aeruginosa Kütz. in Natural Medium

Cited by 7 publications

References 22 publications

Rapid detection of microbial cell abundance in aquatic systems

Rapid detection of microbial cell abundance in aquatic systems

Role of Bipolar Pulsed DBD on the Growth of Microcystis aeruginosa in Three-Phase Discharge Plasma Reactor

Antibacterial activity of freshwater microalgae: A review

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