Research Topics
| J P ZehrSummaryAffiliation: University of California Country: USA Publications
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Detail Information
Publications
New perspectives on nitrogen-fixing microorganisms in tropical and subtropical oceansJ P Zehr
Ocean Sciences Dept, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
Trends Microbiol 8:68-73. 2000..Although the extent to which these microorganisms fix nitrogen is currently unclear, ongoing research indicates that they might make a substantial contribution to the open ocean nitrogen budget...- Unicellular cyanobacteria fix N2 in the subtropical North Pacific OceanJ P Zehr
Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
Nature 412:635-8. 2001..Here we show that there are unicellular cyanobacteria in the open ocean that are expressing nitrogenase, and are abundant enough to potentially have a significant role in N dynamics... 
Nitrogen cycling in the ocean: new perspectives on processes and paradigmsJonathan P Zehr
Department of Ocean Sciences, Earth and Marine Sciences Building, Room A438, University of California, Santa Cruz, CA 95064, USA
Appl Environ Microbiol 68:1015-24. 2002- Nitrogenase gene diversity and microbial community structure: a cross-system comparisonJonathan P Zehr
Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, CA 95064, USA
Environ Microbiol 5:539-54. 2003..The broad analysis of nitrogenase genes provides a basis for developing molecular assays and bioinformatics approaches for the study of nitrogen fixation in the environment... - Comparison of diazotroph community structure in Lyngbya sp. and Microcoleus chthonoplastes dominated microbial mats from Guerrero Negro, Baja, MexicoEnoma O Omoregie
Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, 95064, USA
FEMS Microbiol Ecol 47:305-8. 2004.... - Fingerprinting diazotroph communities in the Chesapeake Bay by using a DNA macroarrayBethany D Jenkins
University of California, Santa Cruz, Santa Cruz, California 95064, USA
Appl Environ Microbiol 70:1767-76. 2004..M. Short, B. D. Jenkins, and J. P. Zehr, Appl. Environ. Microbiol., in press). The results show that DNA macroarrays have great potential for mapping the spatial and temporal variability of functional gene diversity in the environment... 
In situ transcriptomic analysis of the globally important keystone N2-fixing taxon Crocosphaera watsoniiIan Hewson
Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
ISME J 3:618-31. 2009....- Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacteriumH James Tripp
Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, California 95064, USA
Nature 464:90-4. 2010..The UCYN-A cyanobacterium is a paradox in evolution and adaptation to the marine environment, and is an example of the tight metabolic coupling between microorganisms in oligotrophic oceanic microbial communities... - Spatial and temporal distribution of two diazotrophic bacteria in the Chesapeake BaySteven M Short
Department of Ocean Sciences, University of California, Santa Cruz, Santa Cruz, California 95064, USA
Appl Environ Microbiol 70:2186-92. 2004.... - Determination of nitrogen-fixing phylotypes in Lyngbya sp. and Microcoleus chthonoplastes cyanobacterial mats from Guerrero Negro, Baja California, MexicoEnoma O Omoregie
Department of Ocean Sciences and Institute of Marine Sciences, University of California, Santa Cruz, California 95064, USA
Appl Environ Microbiol 70:2119-28. 2004..The results of this study indicate that several different organisms, some of which were not previously known to fix nitrogen, are likely to be responsible for the observed dark-period nitrogenase activity in these cyanobacterial mats... - Genome-wide analysis of diel gene expression in the unicellular N(2)-fixing cyanobacterium Crocosphaera watsonii WH 8501Tuo Shi
Department of Ocean Sciences, University of California, Santa Cruz, CA, USA
ISME J 4:621-32. 2010..This study represents the first whole-genome expression profiling in cultivated Crocosphaera, and the results will be useful in determining the basal physiology and ecology of the endemic Crocosphaera populations... - Diel cycling of DNA staining and nifH gene regulation in the unicellular cyanobacterium Crocosphaera watsonii strain WH 8501 (Cyanophyta)Kory Pennebaker
Ocean Sciences Department, University of California, Santa Cruz, CA 95064, USA
Environ Microbiol 12:1001-10. 2010..Thus, nifH gene expression in C. watsonii WH 8501 appears to be influenced by both circadian and environmental factors... - Vertical distribution of nitrogen-fixing phylotypes in a meromictic, hypersaline lakeG F Steward
Department of Ocean Sciences, University of California, Santa Cruz, CA 95064, USA
Microb Ecol 47:30-40. 2004.... - Diversity and abundance of diazotrophic microorganisms in the South China Sea during intermonsoonPia H Moisander
Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA
ISME J 2:954-67. 2008..The SCS diazotroph community has a relatively low diversity and is a mixture of both estuarine and oceanic fingerprints... - Phylogenetic diversity of cyanobacterial narB genes from various marine habitatsRyan W Paerl
Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street EMS D446, Santa Cruz, CA 95064, USA
Environ Microbiol 10:3377-87. 2008..Using a reverse transcription PCR method, narB mRNA sequences were amplified from Heron Island samples, indicating that narB expression can be detected in environmental samples... - Globally distributed uncultivated oceanic N2-fixing cyanobacteria lack oxygenic photosystem IIJonathan P Zehr
Ocean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Science 322:1110-2. 2008.... - Distribution and activity of diazotrophs in the Eastern Equatorial AtlanticRachel A Foster
Ocean Sciences, University of California, Santa Cruz, CA 95064, USA
Environ Microbiol 11:741-50. 2009..The distribution of the diazotroph groups, especially the three strains of symbiotic cyanobacteria, was different, and appeared largely controlled by riverine inputs and upwelling... - Abundance and distribution of major groups of diazotrophic cyanobacteria and their potential contribution to N₂ fixation in the tropical Atlantic OceanNicole L Goebel
University of California at Santa Cruz, Ocean Sciences Department, Santa Cruz, CA 95064, USA
Environ Microbiol 12:3272-89. 2010..Modelled contributions of Trichodesmium, UCYN-B and UCYN-A to total N₂ fixation suggested that Trichodesmium had the largest input, except for the potential of UCYN-A at the Cape Verde Islands... - Microbial community gene expression within colonies of the diazotroph, Trichodesmium, from the Southwest Pacific OceanIan Hewson
Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
ISME J 3:1286-300. 2009..The results provide insight into aggregate microbial communities in contrast to planktonic free-living assemblages that are the focus of other studies... - Unicellular cyanobacterial distributions broaden the oceanic N2 fixation domainPia H Moisander
Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Science 327:1512-4. 2010..These findings have implications for the geographic extent and magnitude of basin-scale oceanic N2 fixation rates... - Modeled contributions of three types of diazotrophs to nitrogen fixation at Station ALOHANicole L Goebel
Institute of Marine Sciences, University of California, Santa Cruz, CA, USA
ISME J 1:606-19. 2007.... - Diazotrophic bacterioplankton in a coral reef lagoon: phylogeny, diel nitrogenase expression and response to phosphate enrichmentIan Hewson
Department of Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA 95064, USA
ISME J 1:78-91. 2007..The presence of typical open ocean phylotype transcripts in lagoon bacterioplankton may indicate that they are an important component of the N cycle of the coral reef... - Low genomic diversity in tropical oceanic N2-fixing cyanobacteriaJonathan P Zehr
Department of Ocean Sciences, University of California, 1156 High Street, Santa Cruz, CA 95064, USA
Proc Natl Acad Sci U S A 104:17807-12. 2007..Although genomic diversity seems to be the rule in many, if not most, marine microbial lineages, different forces may control the evolution and diversification in low abundance microorganisms, such as the nitrogen-fixing cyanobacteria... - Nitrogenase genes in PCR and RT-PCR reagents: implications for studies of diversity of functional genesJonathan P Zehr
Department of Ocean Sciences and Institute of Marine Science, Earth and Marine Sciences, Bldg A438, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Biotechniques 35:996-1002, 1004-5. 2003.... - Characterization of cyanobacterial glnA gene diversity and gene expression in marine environmentsAngela H Gibson
Ocean Sciences, University of California Santa Cruz, Santa Cruz, CA, USA
FEMS Microbiol Ecol 55:391-402. 2006..Results showed that the glnA gene can be used to characterize the diversity of natural populations of cyanobacteria, and to characterize gene expression patterns of individual species or strains... - Application of a nifH oligonucleotide microarray for profiling diversity of N2-fixing microorganisms in marine microbial matsPia H Moisander
Department of Ocean Sciences, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Environ Microbiol 8:1721-35. 2006..The nifH microarray is a powerful tool for diazotroph community analysis in the marine environment... - Characterization of diatom-cyanobacteria symbioses on the basis of nifH, hetR and 16S rRNA sequencesRachel A Foster
Institute of Marine Science, University of California, Santa Cruz, CA 95064, USA
Environ Microbiol 8:1913-25. 2006..clevei, H. hauckii and the Calothrix symbiont of Chaetoceros sp. respectively... - Nitrogen cycle of the open ocean: from genes to ecosystemsJonathan P Zehr
Ocean Sciences Department, University of California, Santa Cruz, California 95064, USA
Ann Rev Mar Sci 3:197-225. 2011..The nitrogen cycle in the oceans is an integral feature of the function of ocean ecosystems and will be a central player in how oceans respond during global environmental change... - Spatial-temporal variability in diazotroph assemblages in Chesapeake Bay using an oligonucleotide nifH microarrayPia H Moisander
Ocean Sciences Department, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Environ Microbiol 9:1823-35. 2007..Higher diversity in the freshwater end of the system may reflect variability in disturbance rates and environmental conditions such as forms and concentrations of organic matter, nutrients and oxygen... - Modelling the vertical distribution of Prochlorococcus and Synechococcus in the North Pacific Subtropical OceanSophie Rabouille
Ocean Sciences Department, University of California, Santa Cruz, CA 95064, USA
Environ Microbiol 9:2588-602. 2007..Results support the idea that intermittent mixing events may have important ecological and geochemical impacts on the phytoplankton community at Station ALOHA... - Nitrogen fixation in an anticyclonic eddy in the oligotrophic North Pacific OceanAllison A Fong
Department of Oceanography, University of Hawaii, Honolulu, HI 96822, USA
ISME J 2:663-76. 2008..These results suggest that mesoscale physical variability can play an important role in modifying the abundances of N(2) fixing microorganisms and associated rates of N(2) fixation in open ocean ecosystems... - Development and testing of a DNA macroarray to assess nitrogenase (nifH) gene diversityGrieg F Steward
Department of Oceanography, School of Ocean and Earth Science and Technology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
Appl Environ Microbiol 70:1455-65. 2004..Our results indicate that macroarray hybridization can be a highly reproducible, semiquantitative method for assessing the diversity of functional genes represented in mixed pools of PCR products amplified from the environment... - High rates of N2 fixation by unicellular diazotrophs in the oligotrophic Pacific OceanJoseph P Montoya
School of Biology, Georgia Institute of Technology, Atlanta, Georgia 30332, USA
Nature 430:1027-32. 2004.... - Temporal patterns of nitrogenase gene (nifH) expression in the oligotrophic North Pacific OceanMatthew J Church
Department of Oceanography, University of Hawaii, Honolulu, HI 96822, USA
Appl Environ Microbiol 71:5362-70. 2005..The temporal separation of nifH expression by the various phylotypes suggests that open ocean diazotrophic cyanobacteria have unique in situ physiological responses to daily fluctuations of light in the upper ocean... - Quantitative analysis of nifH genes and transcripts from aquatic environmentsSteven M Short
Diversa Corp, San Diego, California 92121, USA
Methods Enzymol 397:380-94. 2005.... - Nitrogenase gene expression in the Chesapeake Bay EstuarySteven M Short
Department of Biological Sciences, University of Denver, Denver, CO 80208, USA
Environ Microbiol 9:1591-6. 2007..This study provides the first evidence of nifH expression in the Chesapeake Bay, and suggests that diazotrophic unicellular cyanobacteria have a broader distribution and activity than previously recognized... - Cyanobacterial assimilatory nitrate reductase gene diversity in coastal and oligotrophic marine environmentsBethany D Jenkins
Department of Cell and Molecular Biology and Graduate School of Oceanography, University of Rhode Island, 45 Lower College Road, Kingston, RI 02881, USA
Environ Microbiol 8:2083-95. 2006....