The terrestrial deep subsurface is a huge repository of microbial biomass, but in relation to
its size and physical heterogeneity, few sites have been investigated in detail. Here, we …

The deep subsurface is an enormous repository of microbial life. However, the metabolic
capabilities of these microorganisms and the degree to which they are dependent on surface …

Earth's deep subsurface biosphere (DSB) is home to a vast number and wide variety of
microorganisms. Although difficult to access and sample, deep subsurface environments have …

The subsurface biosphere is a massive repository of fixed carbon, harboring approximately
90% of Earth’s microbial biomass. These microbial communities drive transformations central …

Colonies of the cyanobacterium Trichodesmium are abundant in the oligotrophic ocean, and
through their ability to fix both CO 2 and N 2 , have pivotal roles in the cycling of carbon and …

Continental subsurface environments can present significant energetic challenges to the
resident microorganisms. While these environments are geologically diverse, potentially …

The phylum Cyanobacteria includes free-living bacteria and plastids, the descendants of
cyanobacteria that were engulfed by the ancestral lineage of the major photosynthetic …

Deep subsurface biofilms are estimated to host the majority of prokaryotic life on Earth, yet
fundamental aspects of their ecology remain unknown. An inherent difficulty in studying …

Denitrification plays a central role in the global nitrogen cycle, reducing and removing nitrogen
from marine and terrestrial ecosystems. The flux of nitrogen species through this pathway …

The cyanobacterial genus Trichodesmium is biogeochemically significant because of its dual
role in nitrogen and carbon fixation in the oligotrophic ocean. Trichodesmium species form …