William D. Orsi

Piezophilic activity dominates the Puerto Rico Trench deep subseafloor biosphere

The paper investigates pressure effects on microbial activity in the Puerto Rico Trench, finding that piezophily dominates subseafloor communities below 20 meters below seafloor.

Seafloor topography structures subseafloor microbial communities in the Puerto Rico Trench

This study shows that seafloor topography influences subseafloor microbial communities in the Puerto Rico Trench by shaping oxygen availability and organic matter distribution.

Protist quantitative stable isotope probing identifies diverse active grazers in natural freshwater communities

The paper uses quantitative stable isotope probing to identify active protist grazers in freshwater communities, showing diverse taxa incorporate prey biomass across different sites.

Non-enzymatic assimilation of organosulfur compounds at the interface of geochemistry and biochemistry

This study shows that microbial assimilation of DMS and DMSO can occur through non-enzymatic oxidative mechanisms driven by light and heat, producing methanesulfonic acid and sulfite.

Body-plan reorganization in a sponge correlates with microbiome change

This study shows that losing a key microbial symbiont in sponges leads to body plan reorganization and transcriptomic changes, linking microbiome state to host development.