Warming and nutrient enrichment can trigger seaweed loss by dysregulation of the microbiome structure and predicted function.

Warming and nutrient enrichment are key pervasive drivers of ecological shifts in both aquatic and terrestrial ecosystems, impairing the physiology and survival of a wide range of foundation species. But the underlying mechanisms often remain unclear, and experiments have overlooked the potential effects mediated by changes in the microbial communities. We experimentally tested in the field orthogonal stress combinations from simulated air warming and nutrient enrichment on the intertidal foundation seaweed Cystoseira compressa, and its associated bacterial communities.

Impacts of environmental stress on resistance and resilience of algal-associated bacterial communities.

Algal-associated bacteria are fundamental to the ecological success of marine green macroalgae such as . The resistance and resilience of algal-associated microbiota to environmental stress can promote algal health and genetic adaptation to changing environments. The composition of bacterial communities has been shown to be unique to algal morphological niches.

Flocculation behavior and mechanisms of block copolymer architectures on silica microparticle and Chlorella vulgaris systems.

Hypothesis: Flocculation performance using polyelectrolytes is influenced by critical design parameters including molecular weight, amount and sign of the ionic charge, and polymer architecture. It is expected that systematic variation of these characteristics will impact not only flocculation efficiency (FE) achieved but that charge density and architecture, specifically, can alter the flocculation mechanism. Therefore, it should be possible to tune these design parameters for a desired flocculation application.

Complete genome sequence of Dyadobacter sp. 32, isolated from a culture of the freshwater diatom Cymbella microcephala.

Bacteria have been shown to be involved in different species-specific interactions with eukaryotic algae such as diatoms, impacting important ecosystem processes. Recently, a strain assigned to Dyadobacter, named 'species 32', has been shown to be involved in a number of ecologically relevant diatom processes, such as biofilm formation or growth enhancement, depending on the diatom species. This bacterium was originally isolated from a culture of freshwater benthic diatoms that originated from an epilithic biofilm, in which both bacteria and diatoms coexist.

Disentangling the Influence of Environment, Host Specificity and Thallus Differentiation on Bacterial Communities in Siphonous Green Seaweeds.

Siphonous green seaweeds, such as , are among the most morphologically complex algae with differentiated algal structures (morphological niches). is also host to a rich diversity of bacterial endo- and epibionts. The degree to which these bacterial communities are species-, or even niche-specific remains largely unknown.

Polyamphoteric flocculants for the enhanced separation of cellular suspensions.

Unlabelled: The efficient concentration and separation of microorganisms from dilute culture suspensions is crucial to the success and productivity of many biotechnological processes. This article presents the design and characterization of polyamphoteric flocculants with a tunable, zwitterionic character for the enhanced separation of biocolloidal suspensions of yeast, wastewater, microalgae, and potentially other cellular systems. The polyamphoteric flocculants have overall molecular charges dependent upon the system pH, thereby providing a strong electrostatic attraction to the diverse but predominantly negatively-charged cellular surfaces of the biological suspensions.

Charge-tunable polymers as reversible and recyclable flocculants for the dewatering of microalgae.

Microalgae-derived biofuels have potential advantages over other renewable, crop-based resources; however, large-scale production is not currently economical due, in part, to challenges in the harvesting step. In this article, we present a novel approach for the dewatering and harvesting of microalgae using flocculants that can be recovered and recycled. Polyampholytes with molecular charges dependent upon pH (ranging from net positively- to net negatively-charged) are used as a model flocculant system and provide reversible electrostatic interactions with the negatively-charged algal cells.