Tags: Seminars


THESIS DEFENSE: COURTNEY THOMAS

Please join us for Courtney Thomas’ thesis defense on November 21st at 11:30 am. She will be speaking in room 261, and the title of her talk is: “Bacterial transporters as biosensors of labile dissolved organic matter in the surface ocean.”


Microplastics pollution focus of Evening @ Skidaway Nov. 16

Savannah, Ga. – Tiny pieces of plastic are so pervasive in Georgia’s coastal waters, researchers estimate there are more than a trillion microplastic particles and fibers in the top foot of the state’s inshore waterways.  The issue of microplastics in coastal waters and what, if anything, can be done about them will be the focus of a special Evening @ Skidaway program on Thursday, Nov. 16, in the McGowan Library on the University of Georgia…


Investigating the chemistry of marine aerosol particles and their influence on clouds

The influence of aerosol particles on clouds remains one of the largest uncertainties in accurately predicting the Earth’s energy balance in a changing climate system. The size and chemical composition of aerosol particles affects their radiative properties and ability to grow into cloud droplets, thus influencing the properties and lifetimes of cloud. Recent studies suggest that the presence of surface-active organics (surfactants) in these…


The Ocean Microbial-Environmental Interactome


Aquatic ecology in Southwest Florida

Dr. Toshi Urakawa is an associate professor of marine and Ecological Sciences at Florida Gulf Coast University, which is a new public university mainly focused on undergraduate study and located in Fort Myers, Florida. In Southwest Florida his research has included: the nitrogen cycle and associated microorganisms; cyanobacteria and freshwater restoration; aquaculture; conservation biology, which include smalltooth sawfish and Burmese Pythons,…


Sensing more than a quorum: what are bacteria saying about their hosts?

Many host-associated bacteria use pheromone-signaling (PS) systems to coordinate group behaviors.  Such signaling requires high cell density, and is often referred to as “quorum sensing”.  However, a high cell density “quorum” may be necessary but not sufficient to induce a behavior. Our understanding of the light-organ symbiosis between the bioluminescent bacterium Vibrio fischeri and the Hawaiian bobtail squid Euprymna scolopes…


The Sphagnum Phytobiome: A Team of Ecosystem Engineers in Resource Limited Peatlands

Peat mosses of the genus Sphagnum play a major role in global carbon storage and predominate over photosynthetic production in many northern peatland ecosystems, which are currently being subjected to some of the most rapid climate change on Earth. The objectives of this research are 1.) to investigate the role of the Sphagnum phytobiome (plant host + constituent microbiome + environment) in regulating the carbon and nutrient cycles of peatland…


Marine polyphosphate: Linking the global phosphorus cycle over modern and geologic timescales


Photochemistry and the dissolved organic carbon cycle in the global ocean

The oceanic DOC pool is comparable to the carbon inventory in both atmospheric CO2 and in the total biomass on earth. It’s reactivity, defined by its timescale of oxidation, reflects the complexity of this massive carbon pool and forms a continuum from labile, semi-labile, to refractory carbon constituents. Our studies using HOOH and O2- proxies, as well as novel direct measurements of CO2 photoproduction demonstrate that the capacity for…


Dynamics of ammonia oxidizing Archaea in the South Atlantic Bight

ABSTRACT:  Previous work on the Georgia, USA coast revealed consistent mid-summer peaks in the abundance of Thaumarchaeota accompanied by spikes in nitrite concentration.  We collected data on the distribution of Thaumarchaeota, ammonia-oxidizing Betaproteobacteria (AOB), nitrite-oxidizing Nitrospina, environmental variables and rates of ammonia oxidation during 6 cruises in the South Atlantic Bight from April to November 2014 to…
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