Higher sensitivity of microcystin-producing Microcystis to two algaecides compared to co-cultured non-microcystin producers.

Targeting and selectivity are essential for assessing the effectiveness of ecofriendly algaecides in controlling toxic cyanobacterial blooms. The dose- and time-dependent effects of hydrogen peroxide (HO), pyrogallol and their sustained-release microcapsules (HRM, PRM) on proportion of MC-producing cell numbers and genotypes of the co-existing MC- and non-MC-producing Microcystis, as well as microcystins (MCs) concentrations were investigated in the present study. Two MC-producing and two non-MC-producing Microcystis strains were used in mono- and co-culture test systems.

Trace element and δC values of the banana prawn Penaeus merguiensis reveal the importance of catchment-derived resources across both estuarine and nearshore habitats.

Wet season freshwater flows deliver catchment nutrients (terrestrial and freshwater) to tropical estuaries that stimulate productivity and support consumers. However, the impact of flows on species in the adjacent nearshore is unclear. We investigated how freshwater flows affected the biochemical fingerprint, and by extension the resource use patterns, of the commercially important penaeid prawn, Penaeus merguiensis, in estuarine and nearshore habitats in the tropical Gulf of Carpentaria, Australia by comparing trace element and δC values of prawns across wet and dry seasons.

Factors driving impacts of different nitrogen sources on freshwater and marine green algae.

The response of marine and freshwater algal species to both point and non-point sources of nitrogen have not been directly compared. We compared the photosynthetic yield response (Fv/Fm) of nitrogen-starved freshwater and marine green microalgae after a 3-day exposure to fourteen treated wastewater and nine aquaculture farm effluent as well as twenty-three soil erosion sources. The combination of inorganic and organic nutrients, organic carbon, and carbon-to‑nitrogen ratios were most highly correlated with algal responses across all nitrogen sources (R = 0.

Increased Ordering of Potassium Stearate/Stearic Acid/Glyceryl Stearate Confined between Swollen Cross-Linked Poly(acrylic acid).

In this paper, we investigate the phase behavior of a surfactant mixture comprising glyceryl stearate, potassium stearate, and stearic acid, in the presence of Carbopol, a commonly used thickener in personal care products. At low Carbopol concentrations (<0.03%), the surfactant mixture interacted with Carbopol electrostatically, increasing the degree of Carbopol swelling and, consequently, the overall viscosity.

Sources of nutrients fuelling post-flood phytoplankton biomass in a subtropical bay.

Extreme rainfall from an ex-tropical cyclone caused a major flood event in the Logan River system in southeast Queensland, Australia. This resulted in a significant flood plume, containing nutrients and sediment, being discharged into the adjacent estuary/Bay system. The spatial extent of higher phytoplankton biomass (Chl a) matched the distribution of higher nutrient and sediment concentrations post-flood, suggesting nutrients fuelled phytoplankton production.