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Title
Distinguished Member of Technical Staff -
Email
weber21@llnl.gov -
Phone
(925) 422-3018 -
Organization
Not Available
Research Interests
Peter Weber’s research at LLNL focuses on microbial ecology and forensic signatures in biological and nuclear materials. He is currently a co-principal investigator (PI) on a DOE biofuels program, currently in its eleventh year, a co-PI on a newly-funded DOE soil carbon program, and PI on a LLNL-funded project focused on signatures in UO2 fuel pellets. He has developed new methods for linking microbial function and identity in complex microbial communities and has studied microbial nitrogen fixation, carbon fixation, and carbon cycling. He has also investigated forensic signatures in bacterial spores, vegetative cells, viruses, as well as a range of nuclear materials.
Weber’s experience with mass spectrometry and secondary ion mass spectrometry (SIMS) dates back to 1997 and is a major contributor to his work at LLNL. The NanoSIMS facility at LLNL, which Weber has run for the past fifteen years, is on the forefront of developing methods for analyzing biological, geological, and nuclear materials and correlating analyses with other microanalytical methods such as electron microscopy and atomic force microscopy. Work done at the facility, including developing methods to analyze viruses, cell membranes, and microarrays, pushes the limits of compositional sensitivity.
Weber also has an interest in salmon migration and population structure stretching back to his time as a PhD student at the University of California, Berkeley, where he developed geochemical methods for determining juvenile salmon rearing origin. He has continued this line of work at LLNL by focusing on reconstructing migration history and determining population structure in spawning populations.
Ph.D., Geography, University of California, Berkeley, 2002
M.A., Geography, University of California, Berkeley, 1997
B.S., Physics, Antioch College, 1987
T.C. Valenza, P.K. Weber, E.A. Marquis (2024) Role of nitrogen in the high-temperature oxidation of titanium alloys. Corrosion Science 235:112164. LLNL-JRNL-859619
W. Li, D. Baliu-Rodriguez, S.H. Premathilaka, S.I. Thenuwara, J. Kimbrel, T. Samo, C. Ramon, E.A. Kiledal, S. Rivera, J. Kharbush, D. Isailovic, P.K. Weber, G. Dick, X. Mayali (2024) Microbiome processing of organic nitrogen input supports growth and cyanotoxin production of Microcystis aeruginosa cultures. The ISME Journal, 18(1):wrae082. doi: 10.1093/ismejo/wrae082. LLNL-JRNL-840700
S. Dupuis, U. F. Lingappa, E. S. Sindermann, J. L. Chastain, X. Mayali, P.K. Weber, R. Stuart, S. S. Merchant (2024) Stringency of carbon transfer in a model microbial phototroph-heterotroph symbiosis. The ISME Journal LLNL-JRNL-860322
W. Qin†, S. P. Wei†, Y. Zheng†, E. Choi†, X. Li, J. Johnston, X. Wan, J. B. Abrahamson, Z. Flinkstrom, B. Wang, H. Li, L. Hou, X. Sun, M. Wells, L. Ngo, K. Hunt, H. Urakawa, X. Tao, Do. Wang, Da. Wang, C. Pan, P.K. Weber, J. Jiang, J. Zhou, Y. Zhang, D. A. Stahl, B.B. Ward, X. Mayali, W. Martens-Habbena, M. Winkler (2024) Ammonia-oxidizing bacteria and archaea exhibit differential nitrogen source preferences. († co-first authors) Nature Microbiology 9:524–536. https://doi.org/10.1038/s41564-023-01593-7 LLNL-JRNL-842694
J.G. Ricca, X. Mayali, J. Qu, P.K. Weber, G. Poirier, C.P. Dufresne, J.W. Louda, A.C. Terentis (2024) Endogenous Production and Vibrational Analysis of Heavy-Isotope-Labeled Peptides from Cyanobacteria. ChemBioChem, e202400019. https://doi.org/10.1002/cbic.202400019 LLNL-JRNL-847009
F. Cordoleani, C. C. Phillis, A. M. Sturrock, M. Willmes, G. Whitman, E. Holmes, P. K. Weber, R. C. Johnson Cordoleani (2024) Restoring freshwater habitat mosaic to promote phenotypic diversity and resilience of vulnerable salmon populations. Ecosphere, DOI: 10.1002/ecs2.4803. LLNL-JRNL-851129
A. Kakouridis, M. Yuan, E.E. Nuccio, J.A. Hagen, C.A. Fossum, M.L. Moore, K.Y. Estera-Molina, P.K. Weber, J. Pett-Ridge, and M.K. Firestone (2024). Arbuscular mycorrhiza convey significant plant carbon to a diverse hyphosphere microbial food web and mineral-associated organic matter. New Phytologist 242:1661-1675. doi: 10.1111/nph.19560. LLNL-JRNL-854345
T.C. Valenza, P.K. Weber, E.A. Marquis (2023) Protective role of Niobium in the high-temperature oxidation of titanium. Corrosion Science 225; 111603. https://doi.org/10.1016/j.corsci.2023.111603. LLNL-JRNL-855227
X. Mayali, T.J. Samo, J.A. Kimbrel, R.K. Stuart, M. Morris, K. Rolison, C. Ramon, Y.M. Kim, N. Munoz-Munoz, C. Nicora, S. Purvine, M. Lipton, P.K. Weber (2023) Single cell carbon and nitrogen incorporation and remineralization profiles are uncoupled from phylogenetic groupings of diatom-associated bacteria. Nature Communications 14:5642. https://doi.org/10.1038/s41467-023-41179-9. LLNL-JRNL-836794
G. Trubl, K.M. Stedman, K.F. Bywaters, P.J. Boston, E. Matula, P. Sommers, S. Roux, N. Merino, J. Yin, J.T. Kaelber, A. Avila-Herrera, P.A. Johnson, J.C. Johnson, S. Borges, P.K. Weber, J. Pett-Ridge (2023) Astrovirology: how viruses will enhance our understanding of life in the universe. Preprints 2023, 2023010266 (doi: 10.20944/preprints202301.0266.v1). LLNL-JRNL-839210
M. Palmer, J. Covington, E.-M. Zhou, S. Thomas, N. Habib, C. Seymour, D. Lai, J. Johnston, A. Hashimi, J.-Y. Jiao, A. Muok, L. Liu, W.-D. Xian, X.-Y. Zhi, M.-M. Li, L. Silva, B. Bowen, K. Louie, A. Briegel, J. Pett-Ridge, P.K. Weber, E. Tocheva, T. Woyke, T. Northen, X. Mayali, W.-J. Li, B. Hedlund (2023) Thermophilic Dehalococcoidia with unusual traits shed light on an unexpected past. ISME J. LLNL-JRNL-841058
D.P. Yee, T.J. Samo, R.M. Abbriano, B. Shimasaki, M. Vernet, X. Mayali, P.K. Weber, B.G. Mitchell, M. Hildebrand, M. Tresguerres (2023) A proton pump enhancing photosynthesis links phagocytosis to marine phytoplankton symbiogenesis, Current Biology 33(12):2541-2547.e5. doi:10.1016/j.cub.2023.05.020. LLNL-JRNL-826809
T.C. Valenza, P. Chao, P.K. Weber, O.K. Neill, E.A. Marquis (2023) Protective role of silicon in the high-temperature oxidation of titanium. Corrosion Science : 217. https://doi.org/10.1016/j.corsci.2023.111110. LLNL-JRNL-841693
A.E. Parada, X. Mayali, P.K. Weber, J. Wollard, A.E. Santoro, J.A. Fuhrman, J. Pett-Ridge, A.E. Dekas (2022) Constraining organic matter use by Marine Group I Thaumarchaeota: a role for nitrogenous organic matter in carbon and nitrogen assimilation. Environmental Microbiology, DOI: 10.1111/1462-2920.16299. LLNL-JRNL-817026
T.L. Barth, P.K. Weber, T. Liu, F. Xue, E. Opila, T. Valenza, E.A. Marquis (2022) Grain boundary transport through thermally grown alumina scales on NiAl. Corrosion Science 209:110798. LLNL-JRNL-837166
K. Harding, K.A. Turk-Kubo, E.W. Kwan Mak, P.K. Weber, X. Mayali, J.P. Zehr (2022) Direct cell-specific measurements show N2 fixation by particle-attached non-cyanobacterial diazotrophs in the North Pacific Subtropical Gyre. Nature Communications 13:6979. https://doi.org/10.1038/s41467-022-34585-y. LLNL-JRNL-823311
Y. Zhu, T.W. Heo, J.N. Rodriguez, P.K. Weber, R. Shi, B.J. Baer, F.F. Morgado, S. Antonov, K.E. Kweon, E.B. Watkins, D.J. Savage, J.E. Chapman, N.D. Keilbart, Y. Song, Q. Zhen, B. Gault, S.C. Vogel, S.T. Sen-Britain, M.G. Shalloo, C. Orme, M.B. Hansen, C. Hahn, T.A. Pham, D.D. Macdonald, S.R. Qiu, B.C. Wood (2022) Hydriding of titanium: Recent trends and perspectives in advanced characterization and multiscale modeling. Current Opinion in Solid State and Materials Science 101020, https://doi.org/10.1016/j.cossms.2022.101020. LLNL-JRNL-823435
C. Hui, S. Schmollinger, D. Strenkert, K. Holbrook, S. A. Green, S. Chen, H.M. Nelson, P.K. Weber, S.S. Merchant (2022) Simple steps to enable reproducibility: Culture conditions affecting Chlamydomonas growth and elemental composition. The Plant Journal 111:995–101. https://doi.org/10.1111/tpj.15867. LLNL-JRNL-837234
A. Kakouridis, J.A. Hagen, M.P. Kan, S. Mambelli, L.J. Feldman, D.J. Herman, P.K. Weber, J. Pett-Ridge, and M.K. Firestone (2022) Routes to Roots: Direct Evidence of Water Transport by Arbuscular Mycorrhizal Fungi to Host Plants. New Phytologist doi:10.1111/nph.18281. LLNL-JRNL-814139
J.D. Chaffin, J.A. Westrick, E. Furr, J.A. Birbeck, L.A. Reitzc, K. Stanislawczyk, W. Li, P.K. Weber, T.B. Bridgeman, T.W. Davis, X. Mayali (2022) Quantification of microcystin production and loss rates in the western basin of Lake Erie. Limnology and Oceanography 67:1470-1483. LLNL-JRNL-827378
S. Buessecker, M. Palmer, D. Lai, J. Dimapilis, X. Mayali, D. Mosier, J.-Y. Jiao, D. R. Colman, L. M. Keller, E. St. John, M. Miranda, C. Gonzalez, L. Gonzalez, C. Sam, C. Villa, M. Zhuo, N. Bodman, F. Robles, E. S. Boyd, A. D. Cox, B. St. Clair, Z.-S. Hua, W.-J. Li, A.-L. Reysenbach, M.B. Stott, P.K. Weber, J. Pett-Ridge, A. E. Dekas, B. P. Hedlund, and J. A. Dodsworth (2022) Tungsten is essential for carbohydrate metabolism in members of a novel family of anaerobic thermophilic Caldarchaeales (Aigarchaeota). Nature Communications 13:3773. LLNL-JRNL-827380
M. Kolton, D. J. Weston, X. Mayali, P. K. Weber, K. J. McFarlane, J. Pett-Ridge, M. Somoza, J. B. Glass, E. A. Lilleskov, A. J. Shaw, S. Tringe, P. J. Hanson, J. E. Kostka (2022) Defining the core Sphagnum microbiome and its role in ecosystem function in peatlands across the North American continent. mBio 13:e03714-21. LLNL-JRNL-819132
J. Lee, R. Hestrin, E.E. Nuccio, K. Morrison, C.E. Ramon, T.J. Samo, J. Pett-Ridge, S. Ly, T. Laurence, P.K. Weber (2022) Label-free multiphoton imaging of microbes in root, mineral and soil matrices in optically opaque samples with time-gated coherent Raman and fluorescence lifetime imaging. Environmental Science and Technology 56:1994–2008. https://doi.org/10.1021/acs.est.1c05818. LLNL-JRNL-825764
D. Wang, L.A. Poyneer, D. Chen, S.M. Ammons, J. Lee, S. S. Ly, T.A. Laurence, K.D. Morrison, P.K. Weber (2022) Wavefront shaping with Hadamard basis for soil imaging. Applied Optics 61:F47. https://doi.org/10.1364/AO.442957. LLNL-JRNL-826634
C.R. See, A.B. Keller, P.K. Weber, S.E. Hobbie, P.G. Kennedy, J. Pett-Ridge (2022) Hyphae move matter and microbes to mineral microsites: Integrating the hyphosphere into conceptual models of soil organic matter stabilization. Global Change Biology 28:2527-2540. DOI: 10.1111/gcb.16073; LLNL-JRNL-826549
E.E. Nuccio, N.H. Nguyen, U.N. da Rocha, X. Mayali, J. Bougoure, P.K. Weber, E. Brodie, M.K. Firestone, J. Pett-Ridge. (2021) Community RNA-Seq: Multi-kingdom responses to living verses decaying root inputs. ISME Communications https://doi.org/10.1038/s43705-021-00059-3; LLNL-JRNL-818333
F. Cordoleani, C. C. Phillis, A. M. Sturrock, A. FitzGerald, G. Whitman, A. Malkassian, P. K. Weber, R. C. Johnson (2021) Threatened salmon rely on a rare life history strategy in a modified and warming landscape. Nature Climate Change 11:982-988. LLNL-JRNL-825887
G. Trubl, J. A. Kimbrel, J. Liquet-Gonzalez, E. E. Nuccio, P. K. Weber, J. Pett-Ridge, J. K. Jansson, M. P. Waldrop, S. J. Blazewicz (2021) Active virus-host interactions at sub-freezing temperatures in Arctic peat soil. Microbiome 9: 208. https://doi.org/10.1186/s40168-021-01154-2 LLNL-JRNL-814032
R. Hestrin, P. K. Weber, J. Pett-Ridge, and J. Lehmann (2021) Plants and mycorrhizal symbionts acquire substantial soil nitrogen through gaseous transport. New Phytologist 231:1746-1757. https://doi.org/10.1111/nph.17527 LLNL-JRNL-814366
D. Weisz, K. Knight, P.K. Weber, P. Boone, P. Bedrossian (2020) Spatially-Resolved Characterization Techniques and Implications for Nuclear Debris Formation. Countering WMD Journal Issue 21, Summer/Fall 2020, https://www.nec.belvoir.army.mil/usanca/currentIssue.asp. LLNL-JRNL-814284.
S.V. Jovanovic*, P.K. Weber*, A.J. Pidduck, A.M. Gaffney, P. Girard, F. Pointurier, M. Hedberg, A.J. Simons, V Stebelkov, T. Kell, N. J. Montgomery, J. King, A. Wickenden, D. Knight, I. A. Elantyev, K.D. Zhizhin, N. Albert, M.-C. Vincent, M. Wallenius, K. Knight, T. Parsons-Davis, M. Kristo, R. W. Williams, K.C. Treinen, J.M. Schwantes, O. Marsden, F. Taylor, A.-L. Fauré and A. Hubert (2020) Uncovering uranium isotopic heterogeneity of fuel pellets from the Fifth Collaborative Materials Exercise of the Nuclear Forensics International Technical Working Group. Journal of Nuclear Materials 326:1853–1866. *Equal contribution. LLNL-JRNL-807400
R.K. Stuart, E.R.A. Pederson, P.D. Weyman, P.K. Weber, U. Rasmussen, and C.L. Dupont (2020) Bidirectional C and N exchange and a potential role for sulfur in an epiphytic cyanobacteria-moss diazotrophic mutualism. ISME J. 14: 3068-3078. LLNL-JRNL-796727
A. Gross, Y. Lin, P.K. Weber, J. Pett-Ridge and W. L. Silver (2020) Soil oxygen limits microbial phosphorus utilization in humid tropical forest soils. Ecology 101: e02928. doi: 10.1002/ecy.2928 LLNL-JRNL-738829
A.E. Dekas, A.E. Parada, X. Mayali, J.A. Fuhrman, J. Wollard, P.K. Weber and J. Pett-Ridge (2019) Characterizing chemoautotrophy and heterotrophy in marine archaea and bacteria with single-cell multi-isotope nanoSIP. Frontiers in Microbiology, doi: 10.3389/fmicb.2019.02682 LLNL-JRNL-772256
M. Tsednee, M. Castruita, P.A. Salomé, A. Sharma, B. E. Lewis, S. R. Schmollinger, K. Holbrook, M. Otegui, K. Khatua, S. Das, A. Datta, S. Chen, C. Ramon, M. Ralle, P.K. Weber, T.L. Stemmler, J. Pett-Ridge, B.M. Hoffman and S.S. Merchant (2019) Hyper-accumulated Mn, co-localized in acidocalcisomes with Ca and P, can be mobilized in Mn-deficient situations. Journal of Biological Chemistry jbc.RA119.009130. doi: 10.1074/jbc.RA119.009130. LLNL-JRNL-772298
N. Kessler, R. Armoza-Zvuloni, S. Wang, S. Basu, P.K. Weber, R. K. Stuart, and Y. Shaked (2019) Selective collection of iron-rich dust particles by natural Trichodesmium colonies. ISME Journal 14(1):91-103. DOI: 10.1038/s41396-019-0505-x. LLNL-JRNL-787718
R. Kips, P.K. Weber, M. Kristo, B. Jacobsen, E. Ramon (2019) Microscale isotopic variation in uranium fuel pellets with implications for nuclear forensics. Analytical Chemistry 91(18):11598-11605. doi: 10.1021/acs.analchem.9b01737. (cover) LLNL-JRNL-770145
J.Z. Lee, R.C. Everroad, U. Karaoz, A.M Detweiler, J. Pett-Ridge, P.K Weber, L. Prufert-Bebout, and B.M Bebout (2018) Metagenomics reveals niche partitioning within the phototrophic zone of a microbial mat. PLOS ONE 13(9): e0202792. 10.1371/journal.pone.0202792. LLNL-JRNL-731625
A. Yeager, P.K. Weber, M.L. Kraft (2018) Cholesterol is enriched in the sphingolipid patches on the substrate near nonpolarized MDCK cells, but not in the sphingolipid domains in their plasma membranes. Biochimica et Biophysica Acta - Biomembranes 1860: 2004-2011. 10.1016/j.bbamem.2018.04.008. LLNL-JRNL-745101
T.J. Samo, J.A. Kimbrel, D.J. Nilson, J. Pett-Ridge, P.K. Weber, X. Mayali (2018) Attachment between heterotrophic bacteria and microalgae influences mutualistic microscale interactions. Environmental Microbiology 20(12):4385-4400. DOI: 10.1111/1462-2920.14357. LLNL-JRNL-883071
X. Mayali and P.K. Weber (2018) Quantitative substrate-specific incorporation reveals niche differentiation in a coastal microbial community, FEMS Microbiology Ecology doi: 10.1093/femsec/fiy047 LLNL-JRNL-681139
C. M. Ackerman, P. K. Weber, T. Xiao, B. Thai, T. J. Kuo, E. Zhang, J. Pett-Ridge, and C. J. Chang (2018) Multimodal LA-ICP-MS and nanoSIMS imaging enables copper mapping within photoreceptor megamitochondria in a zebrafish model of Menkes disease. Metallomics 10, 474-485. LLNL-JRNL-745593
S.D. Gates, R. Condit, N. Moussatche, B.J. Stewart, A.J. Malkin, P.K. Weber (2018) High initial sputter rate found for Vaccinia virions using isotopic labeling and high lateral resolution secondary ion mass spectrometry. Analytical Chemistry 90: 1613–1620. LLNL-JRNL-729380
C.C. Phillis, A. Sturrock, R. Johnson, P.K. Weber (2017) Endangered winter-run Chinook salmon rely on non-natal rearing habitats in a highly altered landscape. Conservation Biology 217: 358-362. LLNL-JRNL-739342
P. D’haeseleer, J. Z. Lee, R. C. Everroad, L. Prufert-Bebout, L. C. Burow, A, Detweiler, P. K. Weber, U. Karaoz, E. L. Brodie, T. Glavina del Rio, S. Tringe, B. Bebout, J. Pett-Ridge (2017) Metagenomic analysis of intertidal hypersaline microbial mats from Elkhorn Slough, California, grown with and without molybdate, Standards in Genomic Sciences 12: 67. DOI 10.1186/s40793-017-0279-6 LLNL-JRNL-739283
S. Bryson, Z. Li, F. Chavez, P.K. Weber, J. Pett-Ridge, R. Hettich, C. Pan, X. Mayali, and R. Mueller (2017) Phylogenetically conserved resource partitioning in the coastal microbial loop. The ISME Journal 11: 2781-2792. doi: 10.1038/ismej.2017.128. LLNL-JRNL-726599
D. Novelle, B. Jacobsen, P.K. Weber, F. Ryerson, J.A. Taburnez, W. DuFrane (2017) Hydrogen self-diffusion in single crystal olivine and electrical conductivity of the Earth’s mantle. Scientific Reports 7: 5344. | DOI:10.1038/s41598-017-05113-6 LLNL-JRNL-706280
R.K. Stuart, X. Mayali, M.P. Thelen, J. Pett-Ridge, P.K. Weber (2017) Measuring Cyanobacterial Metabolism in Biofilms with NanoSIMS Isotope Imaging and Scanning Electron Microscopy (SEM). Bio-Protocol LLNL-JRNL-728103
N. Arandia-Gorostidi, P.K. Weber, L. Alonso-Saez, X.A. Moran, T.M. Huete-Stauffer Gonzalez, X. Mayali (2017) Elevated temperature increases carbon and nitrogen fluxes between phytoplankton and heterotrophic bacteria through physical attachment. The ISME Journal 11, 641-650. LLNL-JRNL-677811
D.G. Weisz, B. Jacobsen, N. E. Marks, K. B. Knight, B. H. Isselhardt, J. E. Matzel, P. K. Weber, S.G. Prussin and I.D. Hutcheon (2016) Deposition of vaporized species onto glassy fallout form a near-surface nuclear test. Geochima Cosmochima Acta LLNL-JRNL-684357
N. Musat, F. Musat, P. K Weber, and J. Pett-Ridge (2016) Tracking microbial interactions with NanoSIMS. Current Opinion in Biotechnology 41: 114-121. doi.org/10.1016/j.copbio.2016.06.007 LLNL-JRNL-700939
R.K. Stuart, X. Mayali, A. Boaro, M. Lipton, J.Z. Lee, R.C. Everroad, B.M. Bebout, P.K. Weber, J. Pett-Ridge, M.P. Thelen (2016) Light regimes shape utilization of extracellular organic C and N in a cyanobacterial biofilm. mBio 7:3 e00650-16. doi: 10.1128/mBio.00650-16 LLNL-JRNL-682499
V. Tai, K.J. Carpenter, P.K. Weber, C.A. Nalepa, S.J. Perlman, P.J. Keeling (2016) Genome evolution and nitrogen-fixation in bacterial ectosymbionts of a protist inhabiting wood-feeding cockroaches. Applied and Environmental Microbiology doi: 10.1128/AEM.00611-16. LLNL-JRNL-672456
J.I. Simon, J. E.P. Matzel, S B. Simon, I.D. Hutcheon, D.K. Rossa, P.K. Weber, L. Grossman (2016) Oxygen isotopic variations in the outer margins and Wark–Lovering rims of refractory inclusions. Geochmica et Cosmochimica Acta 186: 242-276. LLNL-JRNL-696173
L.E. de-Bashan, X Mayali, BM Bebout, P.K. Weber, A Detweller, J.-P. Hernandez, L Prufert-Bebout, Y. Bashan. (2016) Establishment of stable synthetic mutualism without co-evolution between microalgae and bacteria demonstrated by mutual transfer of metabolites (NanoSIMS isotopic imaging) and persistent physical association (Fluorescent in situ hybridization) Algal Research 15: 179–186. LLNL-JRNL-675179
A.N. Yeager, P.K. Weber, M.L. Kraft (2016) Three-dimensional imaging of cholesterol and sphingolipids within a Madin-Darby Canine Kidney Cell. Biointerfaces 11:02A309. doi: 10.1116/1.4939681 LLNL-JRNL-680575
R.C. Johnson, J.C. Garza, R.B. MacFarlane, C.B. Grimes, C.C. Phillis, P.L. Koch, P.K. Weber, M.H. Carr (2016) Isotopes and genes reveal freshwater origins of Chinook salmon (Oncorhynchus tshawytscha) aggregations in California’s coastal ocean. Marine Ecology Progress Series 548:181-196. LLNL-JRNL-698547
X. Mayali, B. Stewart, S. Mabery, P.K. Weber (2016) Temporal succession in carbon incorporation from macromolecules by particle-attached bacteria in marine microcosms. Environmental Microbiology Reports 8: 68-75. DOI: 10.1111/1758-2229.12352. LLNL-JRNL-641031
R. K Stuart, X. Mayali, J. Z Lee, R C. Everroad, M. Hwang, B. M. Bebout, P. K Weber, J. Pett-Ridge, and M. P Thelen (2015) Cyanobacterial reuse of extracellular organic carbon in microbial mats. The ISME Journal 10(5):1240-1251. doi: 10.1038/ismej.2015.180. LLNL-JRNL-667325
M. Keiluweit, J.J. Bougoure, P.S. Nico, J. Pett-Ridge, P.K. Weber, and M. Kleber (2015) Mineral protection of soil carbon counteracted by root exudates. Nature Climate Change 5: 588–595. doi:10.1038/nclimate2580
R.L. Wilson, J.F. Frisz, H.A. Klitzing, J. Zimmerberg, P.K. Weber, and M .L. Kraft (2015) Hemagglutinin clusters in the plasma membrane are not enriched with cholesterol and sphingolipids. Biophysical Journal 108(7):1652-1659. LLNL-JRNL-698175
A.M. Sturrock, J.D. Wikert, T. Heyne, C. Mesick, A. Hubbard, P.K. Weber, G. Whitman, J.J. Glessner, R.C. Johnson (2015) Reconstructing the migratory behavior and long-term survivorship of juvenile chinook salmon under contrasting hydrologic regimes. PlosOne. DOI: 10.1371/journal.pone.0122380 LLNL-JRNL-698181.
W. Siekhaus, P.K. Weber, I.D. Hutcheon, J.E.P. Matzel, W. McLean (2015) Hydrogen accumulates in and UH3 precipitates at U-C-N-O inclusions in uranium. JAICom B.
Hong-Hermesdorf, M. Miethke, S.D. Gallaher, J. Kropat, S.C. Dodani, D. Barupala, J. Chan, D.W. Domaille, D.I. Shirasaki, J.A. Loo, P.K. Weber, J. Pett-Ridge, T.L. Stemmler, C.J. Chang & S.S. Merchant (2014) Selective sub-cellular visualization of trace metals identifies dynamic sites of Cu accumulation in Chlamydomonas. Nature Chemical Biology 10: 1034–1042. doi: 10.1038/nchembio.1662. LLNL-JRNL-652416
D. Woebken, L. C. Burow, L. Prufert-Bebout, T. M. Hoehler, J. Pett-Ridge, S. W. Singer, A. M. Spormann, P.K. Weber, B. M. Bebout (2015) Revisiting N2 fixation in Guerrero Negro intertidal microbial mats with a functional single-cell approach. The ISME Journal 9(2):485-96. LLNL-JRNL-672239
L.F. Dobrzhinetskaya, R. Wirth, J. Yang, H.W. Green, I.D. Hutcheon, P.K. Weber, and E.S. Grew (2014) Qingsongite, natural cubic boron nitride: The first boron mineral from the Earth's mantle. American Mineralogist 99: 764–772. doi:10.2138/am.2014.4714.
X. Mayali, P.K. Weber, S. Mabery, J. Pett-Ridge (2014) Phylogenetic patterns in the microbial response to resource availability: amino acid incorporation in San Francisco Bay. PlosOne 9(4) e95842. LLNL-JRNL-565076
K.E. Limburg, B.D Walther, Z. Lu, G. Jackman, J. Mohan, Y. Walther, A. Nissling, P.K. Weber, A.K Schmitt (2014) In search of the dead zone: use of otoliths for tracking fish exposure to hypoxia. Journal of Marine Systems 01/2014. LLNL-JRNL-650136
S. Ghosal, P.K. Weber, A. Laskin (2014) Spatially resolved chemical imaging of individual atmospheric particles using nano-scale imaging mass spectrometry: Insights into particle origin and chemistry. Analytical Methods, 6 (8), 2444-2451. (cover) LLNL-JRNL-650135
J.Z. Lee, L.C. Burow, D. Woebken, M.D. Kubo, R, Craig Everroad, A. Spormann, P.K. Weber, J. Pett-Ridge, B.M. Bebout, T.M. Hoehler (2014) Fermentation couples Chloroflexi and sulfate-reducing bacteria to Cyanobacteria in hypersaline microbial mats. Frontiers in Microbiology 5:61. LLNL-JRNL-652431
L.C. Burow, D. Woebken, B.M. Bebout, I.P.G. Marshall, S.W. Singer, J. Pett-Ridge, L. Prufert-Bebout, A.M. Spormann, P.K. Weber and T.M. Hoehler (2014) Identification of Desulfobacterales as primary hydrogenotrophs in a complex microbial mat community. Geobiology 12:221-230. LLNL-JRNL-605212
K. J. Carpenter, P. K. Weber, M. L. Davisson, J. Pett-Ridge, M. I. Haverty and P. J. Keeling (2013) Correlated SEM, FIB-SEM, TEM, and NanoSIMS imaging of microbes from the hindgut of a lower termite: Methods for in-situ functional and ecological studies of uncultivable microbes. Microscopy and Microanalysis 19: 1490-1501. doi:10.1017/S1431927613013482. LLNL-JRNL-557111
J.F. Frisz, H.A. Klitzing, K. Lou, I.D. Hutcheon, P.K. Weber, J. Zimmerberg, M.L. Kraft (2013) Sphingolipid domains in the plasma membranes of fibroblasts are not enriched with cholesterol. The Journal of Biological Chemistry 288: 16855-16861, doi: 10.1074/jbc.M113.473207 LLNL-JRNL-638518
J.F. Frisz, K. Lou, W.P. Hanafin, K.J. Carpenter, J. Zimmerberg, I.D. Hutcheon, P.K. Weber, M.L. Kraft (2013) High-resolution chemical imaging of sphingolipid distribution in the plasma membrane. PNAS USA 110:E613-22. www.pnas.org/cgi/doi/10.1073/pnas.1216585110. LLNL-JRNL-463256
E.E. Nuccio, A. Hodge, J. Pett-Ridge, D.J. Herman, P.K. Weber, M.K. Firestone (2013) An arbuscular mycorrhizal fungus modifies the soil microbial community and nitrogen cycling during litter decomposition. Environmental Microbiology 15:1870-81. LLNL-JRNL-554312
X. Mayali, P.K. Weber, J. Pett-Ridge (2013) Estuarine bacterial taxa assimilate different ratios of nitrogen and carbon from amino acids. FEMS Microbiology Ecology. 83: 402-412. doi: 10.1111/j.1574-6941.12000.x LLNL-JRNL-553798
L.C. Burow, D. Woebken, I.P.G. Marshall, E.A. Lindquist, B.M. Bebout, L. Prufert-Bebout, T.M. Hoehler, S.G. Tringe, J. Pett-Ridge, P.K. Weber, A.M. Spormann, S.W. Singer. (2013) Anoxic carbon flux in photosynthetic microbial mats as revealed by metatranscriptomics and NanoSIMS. The ISME Journal.7(4):817-29. doi: 10.1038/ismej.2012.150. LLNL-JRNL-582972
L.E. Woodson, B.K. Wells, P.K. Weber, R.B. MacFarlane, G.E. Whitman, R.C. Johnson (2013) Size, growth, and origin-dependent mortality of juvenile Chinook salmon Oncorhynchus tshawytscha during early ocean residence. Marine Ecology Progress Series 487: 163-175
M. Keiluweit, J.J. Bougoure, L.H. Zeglin, D.D. Myrold, P.K. Weber, M. Kleber, J. Pett-Ridge, and P.S. Nico (2012) Nano-scale investigation of the association of microbial nitrogen residues with iron (hydr)oxides in a forest soil O-horizon. Geochimica et Cosmochimica Acta 95: 213-226. LLNL-JRNL-498123
D. Woebken, L. C. Burow, L. Prufert-Bebout, B. M. Bebout, T. M. Hoehler, J. Pett-Ridge, A. M. Spormann, P.K. Weber, S. W. Singer (2012) Identification of a novel cyanobacterial group as active diazotrophs in a coastal microbial mat using NanoSIMS analysis. The ISME Journal. 6: 1427-39. doi: 1751-7370/ismej2011200s1. LLNL-JRNL-501172
X. Mayali, P.K. Weber, E.L. Brodie, S. Mabery, P.D. Hoeprich, and J. Pett-Ridge (2012) High-throughput isotopic analysis of RNA microarrays to quantify microbial resource use. The ISME Journal. 6: 2010-2021. LLNL-JRNL-470805. doi:10.1038/ismej.2011.175
R.C. Johnson, P.K. Weber, J.D. Wikert, M.L.Workman, R.B. MacFarlane, M.J. Grove, and A.K. Schmitt (2012) Managed metapopulations: Do salmon hatchery ‘sources’ lead to in-river ‘sinks’ in conservation? PLoS ONE 7(2): e28880. doi:10.1371/journal.pone.0028880. LLNL-JRNL-426609
R.L. Wilson, J.F. Frisz, W.P. Hanafin, K.J. Carpenter, I.D. Hutcheon, P.K. Weber, and M.L. Kraft (2012) Fluorinated colloidal gold immunolabels for imaging select proteins in parallel with lipids using high-resolution secondary ion mass spectrometry. Bioconjugate Chemistry 23:450–460 DOI: 10.1021/bc200482z
L.C. Burow, D. Woebken, B.M. Bebout, P.J. McMurdie, S. W. Singer, J. Pett-Ridge, L. Prufert-Bebout, A.M. Spormann, P.K. Weber and T.M. Hoehler (2012) Hydrogen production in photosynthetic microbial mats in the Elkhorn Slough Estuary, Monterey Bay. The ISME Journal 6:863-874. LLNL-JRNL-499942. doi: ismej.2011.142.
B. Jacobsen, J. Matzel, I.D. Hutcheon, A.N. Krot, K. Nagashima, H.A. Ishii, E. Ramon, P.K. Weber, B.S. Meyer, A.M. Davis, F.J. Ciesla, Q.-Z. Yin (2011) Formation of short-lived radionuclides during epoch of late-stage irradiation in the protoplanetary disk. The Astrophysical Journal Letters 731:L28. doi:10.1088/2041-8205/731/2/L28 LLNL-JRNL-463459.
J.I. Simon, I.D. Hutcheon, S.B. Simon, J.E.P. Matzel, E.C. Ramon, P.K. Weber, L. Grossman, and D.J. DePaolo (2011) Oxygen isotope variations at the margin of a CAI records circulation within the solar nebula. Science 331:1175-1178 DOI: 10.1126/science.1197970 LLNL-JRNL-471997.
F. Wolfe-Simon, J. Switzer Blum, T.R. Kulp, G.W. Gordon, S.E. Hoeft, J. Pett-Ridge, J.F. Stolz, S.M. Webb, P.K. Weber, P.C.W. Davies, A.D. Anbar, and R.S. Oremland (2011) Response to comments on “A bacterium that can grow by using arsenic instead of phosphorus.” Science 332: 1149. LLNL-JRNL-472592
F. Wolfe-Simon, J. Switzer Blum, T.R. Kulp, G.W. Gordon, S.E. Hoeft, J. Pett-Ridge, J.F. Stolz, S.M. Webb, P.K. Weber, P.C.W. Davies, A.D. Anbar, and R.S. Oremland (2011) A bacterium that can grow by using arsenic instead of phosphorus. Science 332: 1163-1166. doi:10.1126/science.1197258 LLNL-JRNL-461598
C.C. Phillis, D.J. Ostrach, B.L. Ingram, and P.K. Weber (2011) Evaluating otolith Sr/Ca as a tool for reconstructing estuarine habitat use. Canadian Journal of Fisheries and Aquatic Sciences 68: 360–373. LLNL-JRNL-463245; doi:10.1139/F10-152
C.R. Anderton, K. Lou, P.K. Weber, I.D. Hutcheon, and M.L. Kraft (2011) Correlated AFM and NanoSIMS imaging to probe cholesterol-induced changes in phase behavior and non-ideal mixing in ternary lipid membranes. Biochimica et Biophysica Acta-Biomembranes 1808: 307-315. LLNL-JRNL-463216; doi:10.1016/j.bbamem.2010.09.016
J.E.P. Matzel, H.A. Ishii, D. Joswiak, I.D. Hutcheon, J.P. Bradley, D. Brownlee, P.K. Weber, N. Teslich, G. Matrajt, K.D. McKeegan, and G.J. MacPherson (2010) Constraints on the formation age of cometary material from the NASA stardust mission. Science 328: 483-486.
S. Ghosal, T.J. Leighton, K.E. Wheeler, I.D. Hutcheon, and P.K. Weber (2010) Spatially resolved characterization of water and ion incorporation in Bacillus spores, Applied and Environmental Microbiology 76: 3275–3282.
P.K. Weber, G.A. Graham, N.E. Teslich, W. MoberlyChan, S. Ghosal, T.J. Leighton, K.E. Wheeler (2010) NanoSIMS imaging of Bacillus spores sectioned by Focused Ion Beam. Journal of Microscopy 238: 189-199. (cover)
L.F. Dobrzhinetskaya, R. Wirth, J. Yang, I.D. Hutcheon, P.K. Weber, H.W. Green, II (2009) High pressure highly reduced nitrides and oxides from chromite of a Tibetan ophiolite. Proceedings of the National Academy of Science, USA 106: 19233–19238.
X. Wang, X. Li, L. Zhang, Y. Yoon, P.K. Weber, H. Wang, J. Guo, and H. Dai (2009) N-doping of graphene through electro-thermal reactions with ammonia. Science 324:768-771.
J.A. Finzi, J. Pett-Ridge, P.K. Weber, R. Popa, S.J. Fallon, T. Gunderson, I.D. Hutcheon, K.H. Nealson, D.G. Capone (2009) Fixation and fate of carbon and nitrogen in Trichodesmium IMS101 using nanometer resolution secondary ion mass spectrometry (NanoSIMS). Proceedings of the National Academy of Science, USA 106: 6345-6350.
S. Ghosal, S.J. Fallon, T.J. Leighton, K.D. Wheeler, M.J. Kristo, I.D. Hutcheon, and P.K. Weber (2008) Analysis of bacterial spores using Nano-Secondary Ion Mass Spectrometry (NanoSIMS). Analytical Chemistry 80: 5986-5992.
G.A. Graham, N.E. Teslich, A.T. Kearsley, F.J. Stadermann, R.M. Stroud, Z. Dai, H.A. Ishii, I.D. Hutcheon, S.A. Bajt, C.J. Snead, P.K. Weber, J.P. Bradley (2008) Applied focused ion beam techniques to the sample preparation of astromaterials for integrated nanoanalysis. Meteoritics & Planetary Science 43:561-569.
S. Behrens, T. Lösekann, J. Pett-Ridge, P.K. Weber, W.-O. Ng, B. S. Stevenson, I.D. Hutcheon, D.A. Relman, and A.M. Spormann (2008) Linking microbial phylogeny to metabolic activity at the single cell level using enhanced element labeling - catalyzed reporter deposition fluorescence in situ hybridization (EL-FISH) and NanoSIMS. Applied and Environmental Microbiology 74: 3143-3150.
A.-L. Auzende, J. Badro, F. Ryerson, P.K. Weber, S.J. Fallon, A. Addad, J. Sieber, G. Fiquet (2008) Element partitioning between magnesium silicate perovskite and ferropericlase: new insights into bulk lower-mantle geochemistry. Earth and Planetary Science Letters 269: 164-174.
J. Badro, F. Ryerson, P.K. Weber, A. Ricolleau, S.J. Fallon, I.D. Hutcheon, F. Albarède (2007) Chemical imaging with NanoSIMS: A window into deep-Earth geochemical processes. Earth and Planetary Science Letters 262: 543-551.
J.W. Moreau, P.K. Weber, M.C. Martin, B. Gilbert, I.D Hutcheon and J.F. Banfield (2007) Extracellular proteins limit the dispersal of biogenic nanoparticles. Science 316: 1600-1603.
R. Popa, P.K. Weber, J. Pett-Ridge, J.A. Finzi, S.J. Fallon, I.D. Hutcheon, K.H. Nealson and D.G. Capone (2007) Carbon and nitrogen fixation and metabolite exchange in and between individual cells of Anabaena oscillarioides. The ISME Journal 1: 354-360.
M.L. Kraft, P.K. Weber, M.L. Longo, I.D. Hutcheon and S.G. Boxer (2006) Phase separation of lipid membranes analyzed with high-resolution secondary-ion mass spectrometry. Science 313(5795): 1948-1951.
S.B. Simon, L. Grossman, I.D. Hutcheon, D.L. Phinney, P.K. Weber and S.J. Fallon (2006) Formation of spinel-, hibonite-rich inclusions found in CM2 carbonaceous chondrites. American Mineralogist 91(10):1675-1687.
M.L. Kraft, S.F. Fishel, C. Galli Marxer, P.K. Weber, I.D. Hutcheon and S.G. Boxer (2006) Quantitative analysis of supported membrane composition using the NanoSIMS. Applied Surface Science 252: 6950-6956.
C.T. Solomon, P.K. Weber, J.J. Cech, B.L. Ingram, M.E. Conrad, M.V. Machavaram, A.R. Pogodina, and R.L. Franklin (2006) Experimental determination of the sources of carbon to fish otoliths, for application of stable isotope techniques to otolith chronosequences. Canadian Journal of Fisheries and Aquatic Sciences 63: 79-89.
P.K. Weber, C.R. Bacon, I.D. Hutcheon, B.L. Ingram, and J.L. Wooden (2005) Ion microprobe measurement of strontium isotopes in calcium carbonate. Geochimica et Cosmochimica Acta 69(5): 1225-1239.
C. Galli Marxer, M.L. Kraft, P.K. Weber, I.D. Hutcheon, and S.G. Boxer (2005) Supported membrane composition analysis by secondary ion mass spectrometry with high lateral resolution, Biophysical Journal 88: 2965-2975.
J.P. Bradley, Z.R. Dai, R. Erni, N.D. Browning, G.A. Graham, P.K. Weber, J.B. Smith, I.D. Hutcheon, H. Ishii, S. Bajt, C. Floss, F.J. Stadermann, and S. Sandford (2005) An astronomical 2175 Å feature in interplanetary dust particles. Science 307: 244-247.
C.R. Bacon, P.K. Weber, K.A. Larson, R. Reisenbichler, J.A. Fitzpatrick, and J.L. Wooden (2004) Ion microprobe Sr isotope and Sr/Ca analyses of otoliths reveal migration and rearing histories of chinook salmon (Oncorhynchus tshawytscha). Canadian Journal of Fisheries and Aquatic Sciences 61: 2425-2439.
M. Wainwright, P.K. Weber, J.B. Smith, I.D. Hutcheon, B. Klyce, N.C. Wickramasinghe, J.V. Narlikar, and P. Rajaratnam (2004) Studies on bacteria-like particles sampled from the stratosphere. Aeorobiologia 20: 237-240.
P.K. Weber, I.D. Hutcheon, K.D. McKeegan, and B.L. Ingram (2002) Otolith sulfur isotope method to reconstruct salmon (Oncorhynchus tshawytscha) life history. Canadian Journal of Fisheries and Aquatic Sciences 59: 587-591.
B.L. Ingram and P.K. Weber (1999) Salmon origin in California’s Sacramento-San Joaquin river system as determined by otolith strontium isotope compositions. Geology 27: 851-854.
Chapters and Reviews
C.W. Mueller, P.K. Weber, M.R. Kilburn, C. Hoeschen, M. Kleber and J. Pett-Ridge (2013) Advances in the Analysis of Biogeochemical Interfaces: NanoSIMS to Investigate Soil Microenvironments. Advances in Agronomy, 121: 1-46. LLNL-BOOK-592876
H. Klitzing, P.K. Weber, M.L. Kraft (2013) Secondary Ion Mass Spectrometry Imaging of Biological Membranes at High Spatial Resolution. In A.A. Sousa & M.J. Kruhlak, Eds., Nanoimaging: Methods and Protocols, Methods in Molecular Biology 950, Springer Protocols, Humana Press, New York.
J. Pett-Ridge & P.K. Weber (2012) NanoSIP: NanoSIMS Applications for Microbiology. In A. Navid, Ed., Microbial Systems Biology: Methods and Protocols, Methods in Molecular Biology 881, Springer Protocols, Humana Press, New York, pp. 375-408. ISBN 978-1-61779-826-9 ; LLNL-BOOK-483216
S.G. Boxer, M.L. Kraft, and P.K. Weber (2009) Advances in imaging secondary ion mass spectrometry for biological samples. Annual Review of Biophysics 38: 53-74.
Patents and Record of Inventions
J Pett-Ridge, P Hoeprich, P.K. Weber, E. Brodie (2009) CHIP-SIP: Quantification of nucleic acid stable isotope labeling with biopolymer microarrays and secondary ionization mass spectrometry.
Invited Presentations
P.K. Weber, Viral-microbial dynamics: Pushing the limits of stable isotope probing and NanoSIMS. U.S. DOE Genome Sciences Program Workshop, February 27, 2018. LLNL-PRES-746768
P.K. Weber, Microbial Ecology, Cell Biology, National Security and NanoSIMS. Department of Soil Science, Munich Technical University, January 9, 2015. LLNL-PRES-446451.
P.K. Weber, Microbial Ecology, Cell Biology, National Security and NanoSIMS. Center for Advanced Surface Analysis Short Course, University of Lausanne, January 12, 2015. LLNL-PRES-446451.
P.K. Weber, From direct imaging to microarrays: Stable isotope probing of microbial function in complex communities. Goldschmidt Conference, June 11, 2014. LLNL-PRES-655731
P.K. Weber, M.L. Davisson, S.P. Velsko, Validation of quantitative elemental analysis of bulk and trace samples, 26th SIMS Workshop, Washington, DC, May 27-30, 2014.
P.K. Weber, M.L. Davisson, S.P. Velsko, Validation of quantitative elemental analysis of bulk and trace samples, American Vacuum Society, Long Beach, CA, October 29, 2013.
P.K. Weber, S.D. Gates, R.C. Condit, N. Moussatche, and A.J. Malkin, AFM and NanoSIMS analysis of Vaccinia virions, Microscopy and Microanalysis, August 6, 2013. LLNL-PRES-641936
P.K. Weber, Geology and geobiology applications of NanoSIMS, Department of Geological & Environmental Sciences, Stanford University, February 26, 2013. LLNL-PRES-623435
P.K. Weber, Translating high resolution chemical imaging to medical applications, Oregon Health Sciences University, Portland, CA December 22, 2011.
P.K. Weber, Ecological applications of secondary ion mass spectrometry, >UCLA NSF SIMS Workshop, Los Angeles, CA, February 25, 2011.
P.K. Weber, S.P. Velsko, M.L. Davisson, Validation of sample matching by quantitative elemental analysis using trace and bulk samples, Department of Homeland Security Science and Technology Division Bioforensics R&D Program Review, Arlington, VA, August 20, 2010
P.K. Weber, M.L. Davisson, S.P. Velsko, Quantitative elemental analysis, Department of Homeland Security Science and Technology Division 2010 Annual Chemical and Biological Division Performers Conference, Arlington, VA, August 17, 2010.
P.K. Weber, M.L. Kraft, J. Frisz, K. Carpenter, I.D. Hutcheon, Chemical Imaging of the Cell Membrane by NanoSIMS, Microscopy and Microanalysis 2010, Portland, OR, August 7, 2010.
P.K. Weber, Chemical imaging of biological samples by NanoSIMS, Gray Research Group, Lawrence Berkeley National Laboratory, October 29, 2009.
P.K. Weber, B. Viani, M.L. Davisson, S.P. Velsko, Nanometer-scale secondary ion mass spectrometry for microbial characterization, National Research Council Committee on Review of the Scientific Approaches used during the FBI's Investigation of the 2001 Bacillus anthracis Mailings, September 25, 2009
P.K. Weber, Membranes to Microbes: High Resolution Chemical Imaging of Biological Samples, USDA-ARS Western Regional Research Center, Albany, CA, March 24, 2009.
P.K. Weber, Subcellular chemical imaging by NanoSIMS, 12th International Symposium on Microbial Ecology, Cairns, Australia, August 22, 2008
P.K. Weber, Microbial Ecology: How to tell who does what by NanoSIMS, 4th Biennial Geological SIMS Workshop, University of Wisconsin, Madison, WI, June 14, 2008.
P.K. Weber, Membranes to Meteorites: High resolution chemical imaging by NanoSIMS, Geology Department Seminar, Portland State University, November 9, 2007.
P.K. Weber, Material science applications of NanoSIMS, Material Science Institute Workshop, University of Oregon, November 8, 2007.
P.K. Weber, Cell Membranes and Microbes: High resolution biological imaging by NanoSIMS, Institute of Molecular Biology Seminar, University of Oregon, November 7, 2007
P.K. Weber, Geological applications of NanoSIMS, Department of Geological Sciences Seminar, University of Oregon, November 7, 2007.
P.K. Weber, Cyanobacteria and Cell Membranes: Two examples of high resolution biological imaging by NanoSIMS, Lockheed Martin Advanced Technology Center Colloquium, Palo Alto, CA, November 1, 2007.
P.K. Weber, S. Ghosal, S.J. Fallon, I.D. Hutcheon, T.J. Leighton, K.D. Wheeler. Chemical characterization of bacterial spores by NanoSIMS, ASCO Microbial Bioforensics Workshop, Defense Threat Reduction Agency, Ft. Belvoir, VA, June 21, 2006
P.K. Weber, S.J. Fallon, J. Pett-Ridge, S. Ghosal, and I.D. Hutcheon, Chemical imaging of biological materials by NanoSIMS using isotopic and elemental labels, 19th Annual SIMS Workshop, Rancho Mirage, CA May 19, 2006.
P.K. Weber, S.J. Fallon, J. Pett-Ridge, S. Ghosal, and I.D. Hutcheon, High spatial resolution isotopic measurements by NanoSIMS, Isotope Geology Seminar (Donald DePaolo), Earth and Planetary Science, University of California, Berkeley, CA, April 26, 2006.
P.K. Weber, S.J. Fallon, J. Pett-Ridge, S. Ghosal, C.E. Ramon and I.D. Hutcheon, High resolution imaging of microbial systems by NanoSIMS, Geomicrobiology Group (Prof. Jill Banfield), Earth and Planetary Science, University of California, Berkeley, CA, December 17, 2005.
P.K. Weber, S.J. Fallon, J. Pett-Ridge, S. Ghosal, C.E. Ramon and I.D. Hutcheon, High resolution trace element and isotopic imaging of microbial systems by NanoSIMS, American Geophysical Union Fall Meeting, San Francisco, CA, December 5-9, 2005.
P.K. Weber, J.C. Finlay, M.E. Power, C.C. Phillis, C.E. Ramon, G.F. Eaton and B.L. Ingram, Fish Movement and Dietary History Derived from Otolith d13C, American Geophysical Union Fall Meeting, San Francisco, CA, December 5-9, 2005.
P.K. Weber, J.B. Smith and I.D Hutcheon, Chemical imaging of biological materials by NanoSIMS, 31st FACSS Meeting, Portland, OR, October 3-7, 2004.