Nobody had ever seen the model centric diatom, Thalassiosira pseudonana, undergo sexual reproduction. Grad student, Eric Moore, documented the sexual stages and showed upregulation of genes involved in meiosis and flagellar synthesis. Moreover, he figured out what triggers these diatoms and other centric diatoms to shift into the sexual cycle resulting in cell enlargement. Read about it here on BioRxiv.
Our most recent paper on VOC cycling in the surface ocean was just published in Limnology and Oceanography. Phytoplankton produce different profiles of VOCs depending on species and some bacterioplankton, including the ubiquitous and abundant SAR11 bacteria consume these compounds. We designed new incubation chambers and attached these chambers to a PTR-MS to make real time measurements of VOC production and consumption . This work was a collaborative effort with atmospheric physicists at NOAA. Halsey et al. 2017 doi: 10.1002/lno.10596
Our newest paper on photosynthetic energy use was accepted yesterday in Photosynthesis Research. Former graduate student Nerissa Fisher (MS 2015) discovered that under very low light availability, diatoms shift their metabolism in favor of very short ATP generating pathways that circumvent carbon intermediates. These results suggest that this type of pathway gating facilitates the remarkably high efficiencies with which diatoms convert light energy into biomass, especially in low light (Fisher and Halsey, 2016). The paper can be found here:
Mechanisms that increase the growth efficiency of diatoms in low light
A new paper from the Giovannoni lab was published this week in Nature Microbiology on the unexpected discovery that SAR11 bacteria produce methane thiol and DMS from DMSP metabolism. Our role on this paper was to measure real time production of these compounds using PTR-MS. Overall, the research described in this paper combined culturing, biochemistry, genomics, proteomics, and atmospheric chemistry to reveal the remarkable activities of this tiny, abundant, and remarkably impactful bacterium.
Sun et al. 2016_Nat_Microbiol.