![]() CTD recovery |
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![]() Niskins |
![]() Incubations @ KOK1507 |
![]() Incubations @ KOK1507 |
![]() Workspace @ KOK1507 |
![]() Workspace @ KOK1507 |
![]() Incubation array @ KOK1507 |
![]() Incubation array @KOK1507 |
![]() CARD-FISH filtration zone @ KOK1507 |
![]() CARD-FISH filtration zone @ KOK1507 |
![]() Filtering @ KOK1507 |
![]() Buttoned up for the transit to ALOHA |
![]() Incubation array @ KOK1507 |
![]() Recovering the Array @KOK1507 |
![]() MEGAMER BD Influx Cytometer |
![]() KOK1597 Incubation Array Deployment |
![]() KOK1507 Filtering Station |
![]() KOK1507 |
![]() R/V KOK |
![]() KOK1507 Sunset |
![]() KOK1507 Diamond Head |
![]() KOK1507 Sunset |
![]() KOK1507 Sunrise |
![]() KOK1507 Incubation Array Recovery |
![]() KOK1507 Incubation Array Deployment |
![]() KOK1507 |
![]() CMORE C-20 CTD deployment |
![]() CMORE C-20 CTD deployment |
![]() CMORE C-20 qPCR |
![]() CMORE C-20 CTD deployment |
![]() CMORE C-20 CTD sampling |
![]() CMORE C-20 CTD deployment |
![]() R/V Atlantis, Iquique, Chile 2010 |
![]() Deckboard Incubations, ETSP |
![]() Sunset, ETSP |
![]() R/V Atlantis, ETSP |
![]() Dusk, ETSP |
![]() CTD Rosette, R/V Atlantis |
![]() Filtering Station, R/V Atlantis |
![]() CTD Deployment, R/V Atlantis |
![]() View from the bridge, R/V Atlantis |
![]() CTD recovery, R/V Atlantis |
![]() Sunset, ETSP |
![]() Sunset, ETSP |
![]() ESP Recovery, R/V Kilo Moana, 2011 |
![]() ESP Recovery, R/V Kilo Moana, 2011 |
![]() ESP Recovery, R/V Kilo Moana, 2011 |
![]() ESP, NPSG, 2011 |
![]() ESP, R/V Kilo Moana, 2011 |
![]() Snug Harbor, Feb. 2015 |
![]() Oahu, Feb. 2015 |
![]() Returning from Station ALOHA, 2015 |
![]() Hand lining for Mahi Mahi, R/V KoK |
![]() Karl (UH) Cytometry Van, R/V KoK |
![]() R/V KoK, Station ALOHA, Feb. 2015 |
![]() R/V KOK @ Stn. ALOHA, Feb. 2015 |
![]() Deckboard incubations, HOT 269 |
![]() Deckboard incubations, HOT 269 |
![]() Submarine sighting off Oahu |
![]() Departing Oahu, HOT 269, Feb. 2015 |
![]() HOT 269 departing from Snug Harbor |
![]() Sunrise departure, HOT 269 |
![]() R/V Ka`imikai-o-Kanaloa, Feb. 2105 |
![]() Science team, NEMO Cruise, Aug. 2014 |
![]() Snug Harbor, Oahu |
![]() Storm in the NPSG, BioLINCs, 2011 |
![]() Julie Robidart, Chief Sci. BioLINCS |
![]() Sunset in the NPSG, BioLINCs, 2011 |
![]() Sunset in the NPSG, BioLINCs, 2011 |
![]() ESP Recovery, BioLINCs, 2011 |
![]() ESP Recovery, BioLINCs, 2011 |
![]() ESP Recovery, BioLINCs, 2011 |
![]() Sunset, NPSG, R/V Kilo Moana, 2011 |
![]() SID Deployment, BioLINCs, 2011 |
![]() Waiting for the ESP, BioLINCs, 2011 |
![]() Deniz Bombar, BioLINCs, 2011 |
![]() Ariel Rabines, BioLINCs, 2011 |
![]() Tense ESP recovery, BioLINCs, 2011 |
![]() Jon & Darwin |
![]() Jon & Darwin |
![]() Britt @ microscope |
![]() cultures |
![]() Jon |
![]() Mari, Hanna, Britt & Jon |
![]() Mari, Hanna, Britt & Jon |
![]() |
![]() |
![]() heading to sea |
![]() departing sung harbor |
![]() women @ sea |
![]() safety @ sea |
![]() CTD recovery |
![]() CTD recovery |
![]() ready to deploy in situ array |
![]() in situ array recovery |
![]() in situ array recovery |
![]() in situ array recovery |
![]() in situ array recovery |
![]() returning to land |
![]() sunset |
![]() sunset |
![]() sunset |
![]() sunset |
![]() CTD @ dusk |
![]() sunset |
![]() returning to land |
![]() tug assist |
![]() 3000 m foam cups |
![]() Incubation babies lined up |
![]() Incubators on a sunny day |
![]() Filtering for CARD-FISH in the dead box |
![]() Krill |
![]() Sunset |
![]() Termite in bed |
![]() The team |
![]() R/V Sikuliaq |
![]() Deck Ops R/V Sproul |
![]() Winch |
![]() Deployed! |
![]() Winch R/V Sproul |
![]() CTD Ops R/V Sproul |
![]() Incubators R/V Sproul |
![]() Goofin' |
![]() SP1714 team |
![]() Brittany |
![]() UCSC team SP1727 |
![]() CTD ops R/V Sproul |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() |
![]() Looking for land |
![]() Hardy little qPCR |
![]() Incubations! |
![]() Nome, AK |
![]() Nome, AK |
![]() |
![]() Sikuliaq on the hook in Nome |
![]() |
![]() |
![]() Baltic Room |
![]() Beaufort Sea |
![]() |
![]() Beaufort Sea Sunset |
![]() |
![]() R/V Ukpik, Barrow, AK |
![]() Barrow, AK |
![]() R/V Ukpik |
![]() BARC |
![]() |
![]() |
![]() SIO |
![]() SP1727 |
![]() SP1727 |
Zehr Laboratory
Research in our laboratory group focuses on how microorganisms control the availability of nitrogen, a critical element in all life as we know it. Nitrogen, a major plant nutrient, is transformed from one form to another by microorganisms, and moves between habitats. A large reservoir of nitrogen on Earth resides in the air we breath: 80% of the atmosphere is nitrogen gas. Nitrogen gas, or dinitrogen (2 nitrogen atoms triple bonded together) is unavailable to most organisms, in particular the eukaryotic plants and animals. Many diverse prokaryotic microorganisms have the ability to fix nitrogen from the atmosphere into a biologically available form. Biological nitrogen fixation is catalyzed by an enzyme, called nitrogenase. Since most of the microorganisms in the natural environment have yet to be cultivated, we study the microorganisms in the environment that fix nitrogen by looking for the genes and proteins involved in nitrogen fixation.
OUR LATEST RESEARCH
K.A. Turk-Kubo, M.M. Mills, K.R. Arrigo, G. van Dijken, B.A. Henke, B. Stewart, S.T. Wilson, J.P. Zehr, (2021) ISME Communications
M.R. Gradoville, A.M. Cabello, K.A. Turk-Kubo, D.M. Karl, J.P Zehr (2021) Environmental Microbiology
S. Cheung, J.P. Zehr, X. Xia, C. Tsurumoto, H. Endo, S. Nakaoka, W. Mak, K. Suzuki, H. Liu (2021) Environmental Microbiology
D Sarkar, M Landa, A Bandyopadhyay, HB Pakrasi, JP Zehr, CD Maranas (2021) PLoS computational biology
M. Landa, K.A. Turk-Kubo, F.M. Cornejo-Castillo, B.A. Henke, J.P. Zehr (2021) Frontiers in Microbiology
H. Farnelid, K. Turk‐Kubo, J.P. Zehr (2021) Environmental Microbiology
F.M. Cornejo-Castillo, J.P. Zehr (2021) ISME J.
A.M. Cabello, K.A. Turk‐Kubo, K. Hayashi, L. Jacobs, R.M. Kudela, J.P. Zehr (2020) Journal of Phycology
M.M. Mills, K. A. Turk-Kubo, G.L. van Dijken, B.A. Henke, K. Harding, S.T. Wilson, K.R. Arrigo, J.P. Zehr (2020) ISME J.
RECENT RESEARCH CRUISES
Eddy Exploration & Ecosystem Dynamics
North Pacific Subtropical Gyre (NPSG)
Schmidt Ocean Institute
R/V Falkor, March-April 2018

Postdocs Rosie Gradoville and Ana Maria Cabello joined researchers from SCOPE and MBARI to on a research cruise focused on understanding how meso-scale processes (eddies) influence micro-scale processes (diazotroph activity).
Check out the cruise blog here.
Coastal California/Baja Mexico, R/V Sproul, October 2017

Researchers from UCSC and Stanford recently led an expedition to study the activity of UCYN-A in a coastal shelf ecosystem, in collaboration with researchers from VIMS and UABC.
Our research is supported by the Simons Foundation, National Science Foundation (NSF), the Gordon and Betty Moore Foundation (GBMF), and Co-funded by the Horizon 2020 Framework Programme of the European Union.



