Photoalteration of dissolved organic matter (DOM) released from Microcystis aeruginosa in different growth phases: DOM-fraction distribution and biodegradability

A comparison of the role of two blue–green algae in THM and HAA formation

“…This is 302 consistent with the theory that bromide is more effectively incorporated into low UV-absorbing, 303 low molecular weight and hydrophilic fractions, since more than 70% of AOM are hydrophilic 304 (Choi et al, 2004;Henderson et al, 2008). With regard to total DBP yield (THM and HAA), 305 however, no significant change was evident in algae samples with a bromide spike compared to 306 those without bromide; this was also reported by an earlier study of chlorination tests carried out on 307 raw water under different bromide levels (Hua et al, 2006).…”

Examining the Microbial Degradation of Naphthenic Acids Using Stable Isotope Analysis of Carbon and Nitrogen

“…Generally, raw bitumen from the oil sands, which includes oil sands hydrocarbons and PACs, tends to be δ 13 C depleted (bitumen δ 13 C, −30.3‰) similar to the oil sands NA extract (Farwell et al submitted for publication), and would likely not contribute to the observed δ 13 C enrichment. Humic and fulvic acids will also be present in the oil sands extract, although these higher molecular weight (800 to 100,000 amu) compounds tend to be recalcitrant to biodegradation (Headley and McMartin 2004;Ressler et al 1999;Ma et al 2001;Choi et al 2004;Young et al 2005;Adani et al 2006). Recalcitrant acid substances have however, been reported to be 13 C enriched (δ 13 C, −25.6‰, St-Jean 2003) relative to bitumen and NAs.…”

The enhancement of conjugal plasmid pBHR1 transfer between bacteria in the presence of extracellular metabolic products produced by Microcystis aeruginosa

“…The EMPs from M. aeruginosa NIES-298 cultured in CB medium can be classified into five types of organic components (hydrophobic acids, hydrophobic neutrals, hydrophilic acids, hydrophilic neutrals, and hydrophilic bases) [30]. However, more detailed information on the chemical composition of these EMPs is not currently known.…”