Index Catalog // ScholarsArchive@OSU

Early Selection for Improving Volume Growth in Coastal Douglas-fir Breeding Programs

Creator:: Ye, T. Z. and Jayawickrama, K. J. S.
Abstract:: Measurements on growth traits up to 41 years of age from 68 progeny sites in eight first-generation breeding zones of coastal Douglas-fir (Pseudotsuga menziesii [MIRB.] FRANCO var. menziesii) in the US Pacific Northwest were used to investigate age trends of genetic parameters and to determine optimum age of selection. Heritabilities...
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Full Text:: . A., S. A. CAMPBELL, J. R. POWELL, B. E. WOLFE, R. M. CALLAWAY, G. C. THELEN, S. HALLET, D. PRATI

Millennial–scale CaCO₃ and C[subscript ORG] events along the northern and central California margins : stratigraphy and origins

Creator:: Lyle, Mitchell, Mix, Alan C., Ravelo, A. Christina, Andreasen, Dyke, Heusser, Linda, and Olivarez, Annette
Abstract:: Sediments from five Leg 167 drill sites and three piston cores were analyzed for C[subscript ORG] and CaCO₃. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can...
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Full Text:: 11. MILLENNIAL-SCALE CaCO3 AND C ORG EVENTS ALONG THE

Vegetation and climate of the northwest coast of North America during the last 500 K.Y. : high–resolution pollen evidence from the northern California margin

Creator:: Heusser, Linda, Lyle, Mitchell, and Mix, Alan C.
Abstract:: Pollen analyses of sediments from Holes 1019C, 1019E, 1020C, and 1020D as well as piston Core EW9504-17 provide continuous, chronostratigraphically controlled proxy vegetation and climate data for coastal northwest North America for the last ~500 k.y. Systematic changes in the representation of the diagnostic components of northern California plant assemblages...
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Full Text:: Lyle, M., Koizumi, I., Richter, C., and Moore, T.C., Jr. (Eds.), 2000 Proceedings of the Ocean Drilling

Mechanical performance of novel bioactive glass containing dental restorative composites

Creator:: Khvostenko, D., Mitchell, J. C., Hilton, T. J., Ferracane, J. L., and Kruzic, J. J.
Abstract:: OBJECTIVES. Bioactive glass (BAG) is known to possess antimicrobial properties and release ions needed for remineralization of tooth tissue, and therefore may be a strategic additive for dental restorative materials. The objective of this study was to develop BAG containing dental restorative composites with adequate mechanical properties comparable to successful...
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Full Text:: glass containing dental restorative composites D. Khvostenkoa, J. C. Mitchellb*, T. J. Hiltonb, J. L

Tree crown ratio models for multi-species and multi-layered stands of southeastern British Columbia

Creator:: Temesgen, Hailemariam, LeMay, Valerie, and Mitchell, Stephen J.
Abstract:: The ratio of live crown length to tree height (crown ratio; CR) is often used as an important predictor variable for tree level growth equations, particularly for multi-species and multi-layered stands. Also, CR indicates tree vigour and can be an important habitat variable. Measurement of CR for each tree can...
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Full Text:: 2005, VOL. 81, NO. 1 — THE FORESTRY CHRONICLE Hailemariam Temesgen Valerie LeMay Stephen J. Mitchell

Bars, bumps, and holes : models for the generation of complex beach topography

Creator:: Holman, R. A. and Bowen, A. J.
Abstract:: In shallow water, any two waves of the same frequency are shown to produce complex patterns of drift velocity above the sea bed. If the longshore components λ₁, λ₂ of the wave numbers of the two waves are different, these steady flow patterns exhibit a longshore periodicity of wave number...
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Full Text:: . Sonu, C., Field observations of nearshore circulation and meander- ing currents, J. Geophys. Res., 77

Phenology and Productivity of C₃ and C₄ Grasslands in Hawaii

Creator:: Pau, Stephanie and Still, Christopher J.
Abstract:: Grasslands account for a large proportion of global terrestrial productivity and play a critical role in carbon and water cycling. Within grasslands, photosynthetic pathway is an important functional trait yielding different rates of productivity along environmental gradients. Recently, C₃-C₄ sorting along spatial environmental gradients has been reassessed by controlling for...
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Full Text:: Phenology and Productivity of C₃ and C₄ Grasslands in Hawaii Pau, S., Still, C. J. (2014). Phenology and

Cyclic mechanical loading promotes bacterial penetration along composite restoration marginal gaps

Creator:: Khuostenko, D., Salehi, S., Naleway, S. E., Hilton, T. J., Ferracane, J. L., Mitchell, J. C., and Kruzic, J. J.
Abstract:: OBJECTIVES: Secondary caries is the most common reason for composite restoration replacement and usually forms between dentin and the filling. The objective of this study was to investigate the combined effect of cyclic loading and bacterial exposure on bacterial penetration into gaps at the interface between dentin and resin composite...
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Full Text:: ., Hilton, T. J., Ferracane, J. L., Mitchell, J. C., & Kruzic, J. J. (2015). Cyclic mechanical loading

Myths, Artifacts, and Fatal Flaws: Identifying Limitations and Opportunities in Vitamin C Research

Creator:: Michels, Alexander J. and Frei, Balz
Abstract:: Research progress to understand the role of vitamin C (ascorbic acid) in human health has been slow in coming. This is predominantly the result of several flawed approaches to study design, often lacking a full appreciation of the redox chemistry and biology of ascorbic acid. In this review, we summarize...
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Full Text:: : Identifying Limitations and Opportunities in Vitamin C Research Alexander J. Michels * and Balz Frei

Climatically driven changes in oceanic processes throughout the equatorial Pacific

Creator:: Paytan, Adina, Lyle, Mitchell, Mix, Alan C., and Chase, Zanna
Abstract:: The mass accumulation rates of sedimentary components (carbonate, organic carbon, opal, barite, reactive phosphate, iron, terrigenous minerals, etc.) are used in many paleoceanographic reconstructions to learn about temporal and spatial changes in surficial Earth processes including wind stress and direction, oceanic circulation, weathering rates, marine productivity and ecosystem structure, climate...
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Full Text:: . Herguera, J. C. (1992), Deep-sea benthic forami- nifera and biogenic opal: Glacial to postglacial

Patterns of CaCO₃deposition in the eastern tropical Pacific Ocean for the last 150 kyr: Evidence for a southeast Pacific depositional spike during marine isotope stage (MIS) 2

Creator:: Lyle, Mitchell, Mix, Alan C., and Pisias, Nicklas G.
Abstract:: We constructed biogenic mass accumulation rate (MAR) time series for eastern Pacific core transects across the equator at ~105˚and ~85˚W and along the equator from 80˚to 140˚W. We used empirical orthogonal function (EOF) analysis to extract spatially coherent patterns of CaCO₃deposition for the last 150 kyr. EOF mode 1 (51%...
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Full Text:: isotope stage (MIS) 2 Mitchell Lyle Center for Geophysical Investigation of the Shallow Subsurface, Boise

Evidence for Simultaneous Production of J/ψ and ϒ Mesons

Creator:: Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, C. P., Camacho-Pérez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M. C., Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Déliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Fauré, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., García-González, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J.-F., Grohsjean, A., Grünendahl, S., Grünewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffré, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurča, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., Lopes de Sa, R., Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magaña-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martínez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Osta, J., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Pétroff, P., Pleier, M.-A., Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sánchez-Hernández, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Simak, V., Skubic, P., Slattery, P., Smirnov, D., Snow, G. R., Snow, J., Snyder, S., Söldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y.-T., Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., and D0 Collaboration
Abstract:: We report evidence for the simultaneous production of J/ψ and Υ mesons in 8.1 fb⁻¹ of data collected at s√=1.96 TeV by the D0 experiment at the Fermilab pp¯ Tevatron Collider. Events with these characteristics are expected to be produced predominantly by gluon-gluon interactions. In this analysis, we extract the effective cross...
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Full Text:: . Cooke,45,k W. E. Cooper,45 M. Corcoran,73 F. Couderc,15 M.-C. Cousinou,12 J. Cuth,21 D. Cutts,70 A. Das

Habitat Selection by Greater Sage-Grouse During Winter in Southeastern Oregon

Creator:: Hagen, Christian A., Willis, Mitchell J., Glenn, Elizabeth M., and Anthony, Robert G.
Abstract:: The distribution and geographic range of Greater Sage-Grouse (Centrocercus urophasianus) have been reduced by 56% since European settlement. Although loss and fragmentation of sagebrush (Artemisia spp.) habitats have been cited as the primary causes for the decline of the species, degradation of existing habitat also has been considered an important...
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Full Text:: SOUTHEASTERN OREGON Christian A. Hagen1, Mitchell J. Willis2, Elizabeth M. Glenn3, and Robert G. Anthony4

Habitat selection by Greater Sage-Grouse during winter in southeastern Oregon

Creator:: Hagen, Christian A., Willis, Mitchell J., Glenn, Elizabeth M., and Anthony, Robert G.
Abstract:: The distribution and geographic range of Greater Sage-Grouse (Centrocercus urophasianus) have been reduced by 56% since European settlement. Although loss and fragmentation of sagebrush (Artemisia spp.) habitats have been cited as the primary causes for the decline of the species, degradation of existing habitat also has been considered an important...
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Full Text:: SELECTION BY GREATER SAGE-GROUSE DURING WINTER IN SOUTHEASTERN OREGON Christian A. Hagen1, Mitchell J

Extremely efficient photocurrent generation in carbon nanotube photodiodes enabled by a strong axial electric field

Creator:: McCulley, Daniel R., Senger, Mitchell J., Bertoni, Andrea, and Perebeinos., Vasili
Abstract:: Carbon nanotube (CNT) photodiodes have potential to convert light into electrical current with high efficiency. However, previous experiments have revealed photocurrent quantum yield (PCQY) well below 100%. In this work, we show that axial electric field increases the PCQY of CNT photodiodes. In optimal conditions our data suggest PCQY >...
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Full Text:: .; Midgett, A. G.; Luther, J. M.; Beard, M. C.; Nozik, A. J.; Klimov, V. I. Comparison of Carrier

Can fuel-reduction treatments really increase forest carbon storage in the western US by reducing future fire emissions?

Creator:: Campbell, John L., Harmon, Mark E., and Mitchell, Stephen R.
Abstract:: It has been suggested that thinning trees and other fuel-reduction practices aimed at reducing the probability of high-severity forest fire are consistent with efforts to keep carbon (C) sequestered in terrestrial pools, and that such practices should therefore be rewarded rather than penalized in C-accounting schemes. By evaluating how fuel...
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Full Text:: mineral soil C and N: the first direct evidence. Can J Forest Res 38: 2771–83. Bouldin J. 2008. Empirical

Multidecadal variability of atmospheric methane, 1000–1800 C.E.

Creator:: Mitchell, Logan E., Brook, Edward J., Sowers, Todd, McConnell, J. R., and Taylor, Kendrick
Abstract:: We present a new high-precision, high-resolution record of atmospheric methane from the West Antarctic Ice Sheet (WAIS) Divide ice core covering 1000–1800 C.E., a time period known as the late preindustrial Holocene (LPIH). The results are consistent with previous measurements from the Law Dome ice core, the only other high-resolution...
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Full Text:: , 1000–1800 C.E. Logan E. Mitchell,1 Edward J. Brook,1 Todd Sowers,2 J. R. McConnell,3 and Kendrick

A New Method for Analyzing ¹⁴C of Methane in Ancient Air Extracted from Glacial Ice

Creator:: Petrenko, Vasilii V., Smith, Andrew M., Brailsford, Gordon, Riedel, Katja, Hua, Quan, Lowe, Dave, Severinghaus, Jeffrey P., Levchenko, Vladimir, Bromley, Tony, Moss, Rowena, Muhle, Jens, and Brook, Edward J.
Abstract:: We present a new method developed for measuring radiocarbon of methane (¹⁴CH₄) in ancient air samples extracted from glacial ice and dating 11,000–15,000 calendar years before present. The small size (~20 μg CH₄ carbon), low CH₄ concentrations ([CH₄], 400–800 parts per billion [ppb]), high carbon monoxide concentrations ([CO]), and low...
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Full Text:: Levchenko3 • Tony Bromley4 • Rowena Moss4 • Jens Mühle1 • Edward J Brook5 ABSTRACT. We present a new method

Solute and sediment transport at laboratory and field scale: Contributions of J.-Y. Parlange

Creator:: Barry, D. A., Sander, G. C., Jomaa, S., Yeghiazarian, L., Steenhuis, T. S., and Selker, J. S.
Abstract:: We explore selected aspects of J.-Y. Parlange’s contributions to hydrological transport of solutes and sediments, including both the laboratory and field scales. At the laboratory scale, he provided numerous approximations for solute transport accounting for effects of boundary conditions, linear and nonlinear reactions, and means to determine relevant parameters. Theory...
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Full Text:: J.-Y. Parlange D. A. Barry,1 G. C. Sander,2 S. Jomaa,3 L. Yeghiazarian,4 T. S. Steenhuis,5 and J. S

Thauera butanivorans sp. nov., a C₂–C₉ alkane-oxidizing bacterium previously referred to as ‘Pseudomonas butanovora’

Creator:: Dubbels, Bradley L., Sayavedra-Soto, Luis A., Bottomley, Peter J., and Arp, Daniel J.
Abstract:: The placement of ‘Pseudomonas butanovora’ in the genus Thauera was proposed previously, based on 16S rRNA gene sequence analysis, upon further studies of taxonomical characteristics. In this study, physiological characteristics and DNA–DNA reassociation data are presented and the transfer of ‘P. butanovora’ to the genus Thauera is proposed. The original...
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Full Text:: Peter J. Bottomley2 and Daniel J. Arp1 Correspondence Daniel J. Arp arpd@science.oregonstate.edu

Universal interaction-driven gap in metallic carbon nanotubes

Creator:: Senger, Mitchell J., McCulley, Daniel R., Lotfizadeh, Neda, Deshpande, Vikram V., and Minot, Ethan D.
Abstract:: Suspended metallic carbon nanotubes (m-CNTs) exhibit a remarkably large transport gap that can exceed 100 meV. Both experiment and theory suggest that strong electron-electron interactions play a crucial role in generating this electronic structure. To further understand this strongly-interacting system, we have performed electronic measurements of suspended m-CNTs with known...
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Full Text:: nanotubes Mitchell J. Senger1, Daniel R. McCulley1, Neda Lotfizadeh2, Vikram V. Deshpande2, Ethan D

Dielectric Engineering Boosts the Efficiency of Carbon Nanotube Photodiodes

Creator:: Senger, Mitchell J., Kefayati, Ali, Bertoni, Andrea, Perebeinos, Vasili, and Minot, Ethan D.
Abstract:: Carbon nanotube (CNT) photodiodes are a promising system for high-efficiency photocurrent generation due to the strong Coulomb interactions that can drive carrier multiplication. If the Coulomb interactions are too strong, however, exciton formation can hamper photocurrent generation. Here, we explore, experimentally and theoretically, the effect of the environmental dielectric constant...
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Full Text:: Photodiodes Mitchell J. Senger,† Ali Kefayati,§ Andrea Bertoni,‡ Vasili Perebeinos,§ Ethan D. Minot

Biogeographically distinct controls on C₃ and C₄ grass distributions: merging community and physiological ecology

Creator:: Griffith, Daniel M., Anderson, T. Michael, Osborne, Colin P., Strömberg, Caroline A. E., Forrestel, Elisabeth J., and Still, Christopher J.
Abstract:: AIM: C₄ photosynthesis is an adaptation that maintains efficient carbon assimilation in warm and low-CO₂ conditions. Due to the importance of C₄ grasses for carbon and surface energy fluxes numerous models have been proposed to describe their spatial distribution and forecast responses to climate change. These models often rely on...
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Full Text:: Griffith, D. M., Anderson, T. M., Osborne, C. P., Strömberg, C. A. E., Forrestel, E. J., & Still, C. J

¹⁴C and ¹³C characteristics of higher plant biomarkers in Washington margin surface sediments

Creator:: Feng, Xiaojuan, Benitez-Nelson, Bryan C., Montlucon, Daniel B., Prahl, Fredrick G., McNichol, Ann P., Xu, Li, Repeta, Daniel J., and Eglinton, Timothy I.
Abstract:: Plant wax lipids and lignin phenols are the two most common classes of molecular markers that are used to trace vascular plant-derived OM in the marine environment. However, their ¹³C and ¹⁴C compositions have not been directly compared, which can be used to constrain the flux and attenuation of terrestrial...
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Full Text:: . Benitez-Nelson a,b, Daniel B. Montluc�on a,b, Fredrick G. Prahl c, Ann P. McNichol d, Li Xu d, Daniel J

Inhibitory Effects of C₂ to C₁₀ 1-Alkynes on Ammonia Oxidation in Two Nitrososphaera Species

Creator:: Taylor, A. E., Taylor, K., Tennigkeit, B., Palatinszky, M., Stieglmeier, M., Myrold, D. D., Schleper, C., Wagner, M., and Bottomley, P. J.
Abstract:: A previous study showed that ammonia oxidation by the Thaumarchaeota Nitrosopumilus maritimus (group 1.1a) was resistant to concentrations of the C₈ 1-alkyne, octyne, which completely inhibits activity by ammonia-oxidizing bacteria. In this study, the inhibitory effects of octyne and other C₂ to C₁₀ 1-alkynes were evaluated on the nitrite production...
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Full Text:: , M., Stieglmeier, M., Myrold, D. D., Schleper, C., Wagner, M., Bottomley, P. J. (2015). Inhibitory

Site surveys

Creator:: Mayer, Larry A., Pisias, Nicklas G., Mix, Alan C., Lyle, Mitchell, Arason, Pordur, and Mosher, D.
Abstract:: To facilitate the selection of drill sites for Leg 138, a site survey program was conducted on board the Scripps Institution of Oceanography's research vessel Thomas Washington (Cruise Venture 1). During this cruise, which departed San Diego on 30 August 1989 and arrived in Manzanillo, Mexico, on 4 October 1989,...
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Full Text:: . 138 7. SITE SURVEYS1 Larry A. Mayer,2 N. G. Pisias,3 A. C. Mix,4 M. W. Lyle,5 P. Arason,5 and D

Characterizing perpendicular-to-grain compression (C⊥) behavior in wood construction

Creator:: Basta, Craig Thomas, Gupta, Rakesh, Leichti, Robert J., and Sinha, Arijit
Abstract:: Current compression perpendicular-to-grain (C⊥) design values for wood members are based on mean stress obtained from ASTM D143 specimen. The standard ASTM test with metal on wood bearing has limited applicability in modern construction assemblies with C⊥ loading scenarios. Previous work has shown that end-bearing conditions and wood-on-wood C⊥ bearing...
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Full Text:: Characterizing perpendicular-to-grain compression (C

High-resolution infrared studies of perdeutero-spiropentane, C₅D₈

Creator:: Erickson, B. A., Ju, X., Nibler, J. W., Beaudry, C. M., and Blake, T. A.
Abstract:: Perdeutero-spiropentane (C₅D₈) has been synthesized, and infrared and Raman spectra are reported for the first time. Wavenumber assignments are made for most of the fundamental vibrational states. Gas phase infrared spectra were recorded at a resolution (0.002 cm⁻¹) sufficient to resolve individual rovibrational lines and show evidence of strong Coriolis...
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Full Text:: . Cossi, N. Rega, J.M. Millam, M. Klene, J.E. Knox, J.B. Cross, V. Bakken, C. Adamo, J. Jaramillo, R

Atmospheric CO₂ over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core

Creator:: Ahn, Jinho, Brook, Edward J., Mitchell, Logan, Rosen, Julia, McConnell, Joseph R., Taylor, Kendrick, Etheridge, David, and Rubino, Mauro
Abstract:: We report a decadally resolved record of atmospheric CO₂ concentration for the last 1000 years, obtained from the West Antarctic Ice Sheet (WAIS) Divide shallow ice core. The most prominent feature of the pre-industrial period is a rapid ∼7 ppm decrease of CO₂ in a span of ∼20–50 years at...
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Full Text:: Edward J. Brook,2 Logan Mitchell,2 Julia Rosen,2 Joseph R. McConnell,3 Kendrick Taylor,3 David Etheridge

Ice stratigraphy at the Pakitsoq ice margin, West Greenland, derived from gas records

Creator:: Schaefer, Hinrich, Petrenko, Vasilii V., Brook, Edward J., Severinghaus, Jeffrey P., Reeh, Niels, Melton, Joe R., and Mitchell, Logan
Abstract:: Horizontal ice-core sites, where ancient ice is exposed at the glacier surface, offer unique opportunities for paleo-studies of trace components requiring large sample volumes. Following previous work at the Pâkitsoq ice margin in West Greenland, we use a combination of geochemical parameters measured in the ice matrix (δ¹⁸O[subscript ice]) and...
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Full Text:: , derived from gas records Hinrich SCHAEFER,1* Vasilii V. PETRENKO,2y Edward J. BROOK,1 Jeffrey P

B-s(0) lifetime measurement in the CP-odd decay channel B-s(0) → J/ψf₀(980)

Creator:: Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Agnew, J. P., Alexeev, G. D., Alkhazov, G., Alton, A., Askew, A., Atkins, S., Augsten, K., Aushev, V., Aushev, Y., Avila, C., Badaud, F., Bagby, L., Baldin, B., Bandurin, D. V., Banerjee, S., Barberis, E., Baringer, P., Bartlett, J. F., Bassler, U., Bazterra, V., Bean, A., Begalli, M., Bellantoni, L., Beri, S. B., Bernardi, G., Bernhard, R., Bertram, I., Besançon, M., Beuselinck, R., Bhat, P. C., Bhatia, S., Bhatnagar, V., Blazey, G., Blessing, S., Bloom, K., Boehnlein, A., Boline, D., Boos, E. E., Borissov, G., Borysova, M., Brandt, A., Brandt, O., Brochmann, M., Brock, R., Bross, A., Brown, D., Bu, X. B., Buehler, M., Buescher, V., Bunichev, V., Burdin, S., Buszello, C. P., Camacho-Pérez, E., Casey, B. C. K., Castilla-Valdez, H., Caughron, S., Chakrabarti, S., Chan, K. M., Chandra, A., Chapon, E., Chen, G., Cho, S. W., Choi, S., Choudhary, B., Cihangir, S., Claes, D., Clutter, J., Cooke, M., Cooper, W. E., Corcoran, M., Couderc, F., Cousinou, M.-C., Cuth, J., Cutts, D., Das, A., Davies, G., de Jong, S. J., De La Cruz-Burelo, E., Déliot, F., Demina, R., Denisov, D., Denisov, S. P., Desai, S., Deterre, C., DeVaughan, K., Diehl, H. T., Diesburg, M., Ding, P. F., Dominguez, A., Dubey, A., Dudko, L. V., Duperrin, A., Dutt, S., Eads, M., Edmunds, D., Ellison, J., Elvira, V. D., Enari, Y., Evans, H., Evdokimov, A., Evdokimov, V. N., Fauré, A., Feng, L., Ferbel, T., Fiedler, F., Filthaut, F., Fisher, W., Fisk, H. E., Fortner, M., Fox, H., Franc, J., Fuess, S., Garbincius, P. H., Garcia-Bellido, A., García-González, J. A., Gavrilov, V., Geng, W., Gerber, C. E., Gershtein, Y., Ginther, G., Gogota, O., Golovanov, G., Grannis, P. D., Greder, S., Greenlee, H., Grenier, G., Gris, Ph., Grivaz, J.-F., Grohsjean, A., Grünendahl, S., Grünewald, M. W., Guillemin, T., Gutierrez, G., Gutierrez, P., Haley, J., Han, L., Harder, K., Harel, A., Hauptman, J. M., Hays, J., Head, T., Hebbeker, T., Hedin, D., Hegab, H., Heinson, A. P., Heintz, U., Hensel, C., Heredia-De La Cruz, I., Hernández-Villanueva, M., Herner, K., Hesketh, G., Hildreth, M. D., Hirosky, R., Hoang, T., Hobbs, J. D., Hoeneisen, B., Hogan, J., Hohlfeld, M., Holzbauer, J. L., Howley, I., Hubacek, Z., Hynek, V., Iashvili, I., Ilchenko, Y., Illingworth, R., Ito, A. S., Jabeen, S., Jaffré, M., Jayasinghe, A., Jeong, M. S., Jesik, R., Jiang, P., Johns, K., Johnson, E., Johnson, M., Jonckheere, A., Jonsson, P., Joshi, J., Jung, A. W., Juste, A., Kajfasz, E., Karmanov, D., Katsanos, I., Kaur, M., Kehoe, R., Kermiche, S., Khalatyan, N., Khanov, A., Kharchilava, A., Kharzheev, Y. N., Kiselevich, I., Kohli, J. M., Kozelov, A. V., Kraus, J., Kumar, A., Kupco, A., Kurča, T., Kuzmin, V. A., Lammers, S., Lebrun, P., Lee, H. S., Lee, S. W., Lee, W. M., Lei, X., Lellouch, J., Li, D., Li, H., Li, L., Li, Q. Z., Lim, J. K., Lincoln, D., Linnemann, J., Lipaev, V. V., Lipton, R., Liu, H., Liu, Y., Lobodenko, A., Lokajicek, M., Lopes de Sa, R., Luna-Garcia, R., Lyon, A. L., Maciel, A. K. A., Madar, R., Magaña-Villalba, R., Malik, S., Malyshev, V. L., Mansour, J., Martínez-Ortega, J., McCarthy, R., McGivern, C. L., Meijer, M. M., Melnitchouk, A., Menezes, D., Mercadante, P. G., Merkin, M., Meyer, A., Meyer, J., Miconi, F., Mondal, N. K., Mulhearn, M., Nagy, E., Narain, M., Nayyar, R., Neal, H. A., Negret, J. P., Neustroev, P., Nguyen, H. T., Nunnemann, T., Orduna, J., Osman, N., Pal, A., Parashar, N., Parihar, V., Park, S. K., Partridge, R., Parua, N., Patwa, A., Penning, B., Perfilov, M., Peters, Y., Petridis, K., Petrillo, G., Pétroff, P., Pleier, M.-A., Podstavkov, V. M., Popov, A. V., Prewitt, M., Price, D., Prokopenko, N., Qian, J., Quadt, A., Quinn, B., Ratoff, P. N., Razumov, I., Ripp-Baudot, I., Rizatdinova, F., Rominsky, M., Ross, A., Royon, C., Rubinov, P., Ruchti, R., Sajot, G., Sánchez-Hernández, A., Sanders, M. P., Santos, A. S., Savage, G., Savitskyi, M., Sawyer, L., Scanlon, T., Schamberger, R. D., Scheglov, Y., Schellman, H., Schott, M., Schwanenberger, C., Schwienhorst, R., Sekaric, J., Severini, H., Shabalina, E., Shary, V., Shaw, S., Shchukin, A. A., Simak, V., Skubic, P., Slattery, P., Snow, G. R., Snow, J., Snyder, S., Söldner-Rembold, S., Sonnenschein, L., Soustruznik, K., Stark, J., Stefaniuk, N., Stoyanova, D. A., Strauss, M., Suter, L., Svoisky, P., Titov, M., Tokmenin, V. V., Tsai, Y.-T., Tsybychev, D., Tuchming, B., Tully, C., Uvarov, L., Uvarov, S., Uzunyan, S., Van Kooten, R., van Leeuwen, W. M., Varelas, N., Varnes, E. W., Vasilyev, I. A., Verkheev, A. Y., Vertogradov, L. S., Verzocchi, M., Vesterinen, M., Vilanova, D., Vokac, P., Wahl, H. D., Wang, M. H. L. S., Warchol, J., Watts, G., Wayne, M., Weichert, J., Welty-Rieger, L., Williams, M. R. J., Wilson, G. W., Wobisch, M., Wood, D. R., Wyatt, T. R., Xie, Y., Yamada, R., Yang, S., Yasuda, T., Yatsunenko, Y. A., Ye, W., Ye, Z., Yin, H., Yip, K., Youn, S. W., Yu, J. M., Zennamo, J., Zhao, T. G., Zhou, B., Zhu, J., Zielinski, M., Zieminska, D., Zivkovic, L., and D0 Collaboration
Abstract:: See article for Abstract.
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Full Text:: . Cihangir,45,* D. Claes,59 J. Clutter,53 M. Cooke,45,k W. E. Cooper,45 M. Corcoran,73 F. Couderc,15 M.-C

Fatigue Crack Growth Behavior of Nickel-base Superalloy Haynes 282 at 550-750° C

Creator:: Rozman, K. A., Kruzic, J. J., and Hawk, J. A.
Abstract:: The fatigue crack growth rates for nickel-based superalloy Haynes 282 were measured at temperatures of 550, 650, and 750 °C using compact tension specimens with a load ratio of 0.1 and cyclic loading frequencies of 25 Hz and 0.25 Hz. Increasing the temperature from 550 to 750 °C caused the...
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Full Text:: Haynes 282 at 550-750° C Rozman, K. A., Kruzic, J. J., & Hawk, J. A. (2015). Fatigue Crack Growth

Erection of Ceratonova n. gen. (Myxosporea: Ceratomyxidae) to Encompass Freshwater Species C. gasterostea n. sp. from Threespine Stickleback (Gasterosteus aculeatus) and C. shasta n. comb. from Salmonid Fishes

Creator:: Atkinson, S. D., Foott, J. S., and Bartholomew, J. L.
Abstract:: Ceratonova gasterostea n. gen. n. sp. is described from the intestine of freshwater Gasterosteus aculeatus L. from the Klamath River, California. Myxospores are arcuate, 22.4 +/- 2.6 μm thick, 5.2 +/- 0.4 μm long, posterior angle 45 +/- 24°, with 2 sub-spherical polar capsules, diameter 2.3 +/- 0.2 μm, which...
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Full Text:: aculeatus) and C. shasta n. comb. from Salmonid Fishes Atkinson, S. D., Foott, J. S., & Bartholomew, J. L

High-resolution glacial and deglacial record of atmospheric methane by continuous-flow and laser spectrometer analysis along the NEEM ice core

Creator:: Chappellaz, J., Stowasser, C., Blunier, T., Baslev-Clausen, D., Brook, Edward J., Dallmayr, R., Fain, X., Lee, J. E., Mitchell, L. E., Pascual, O., Romanini, D., Rosen, J., and Schuepbach, S.
Abstract:: The Greenland NEEM (North Greenland Eemian Ice Drilling) operation in 2010 provided the first opportunity to combine trace-gas measurements by laser spectroscopic instruments and continuous-flow analysis along a freshly drilled ice core in a field-based setting. We present the resulting atmospheric methane (CH₄) record covering the time period from 107.7...
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Full Text:: ice core J. Chappellaz1,** , C. Stowasser2,** , T. Blunier2, D. Baslev-Clausen2, E. J. Brook3, R

Advancing interpretations of ¹⁴C-uptake measurements in the context of phytoplankton physiology and ecology

Creator:: Milligan, Allen J., Halsey, Kimberly H., and Behrenfeld, Michael J.
Abstract:: The ¹⁴C-uptake method is the most common approach employed for estimating primary production in the ocean. Normalizing ¹⁴C-uptake to chlorophyll a and time yields a value termed the assimilation number, which is thought to reflect phytoplankton physiology. It is often assumed that the measured rate of ¹⁴C-uptake is between net...
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Full Text:: study of plankton productivity. In Williams, P. J. L. B., Thomas, D. N. and Reynolds, C. S. (eds

Comparison between environmental characteristics of larval bluefin tuna Thunnus thynnus habitat in the Gulf of Mexico and western Mediterranean Sea

Creator:: Muhling, Barbara A., Reglero, Patricia, Ciannelli, Lorenzo, Alvarez-Berastegui, Diego, Alemany, Francisco, Lamkin, John T., and Roffer, Mitchell A.
Abstract:: Despite being well adapted for feeding in cold water on their North Atlantic feeding grounds, Atlantic bluefin tuna undertake long migrations to reach warm, low productivity spawn - ing grounds in the Gulf of Mexico and Mediterranean Sea. Environmental conditions within spawning areas have been presumed to benefit larval survival,...
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Full Text:: , Francisco Alemany2, John T. Lamkin5, Mitchell A. Roffer6 1Cooperative Institute for Marine and Atmospheric

Quantitative Trait Loci Associated with the Tocochromanol (Vitamin E) Pathway in Barley

Creator:: Graebner, Ryan C., Wise, Mitchell, Cuesta-Marcos, Alfonso, Geniza, Matthew, Blake, Tom, Blake, Victoria C., Butler, Joshua, Chao, Shiaoman, Hole, David J., Horsley, Rich, Jaiswal, Pankaj, Obert, Don, Smith, Kevin P., Ullrich, Steven, and Hayes, Patrick M.
Abstract:: The Genome-Wide Association Studies approach was used to detect Quantitative Trait Loci associated with tocochromanol concentrations using a panel of 1,466 barley accessions. All major tocochromanol types- α-, β-, δ-, γ-tocopherol and tocotrienol- were assayed. We found 13 single nucleotide polymorphisms associated with the concentration of one or more of...
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Full Text:: Ryan C. Graebner1☯, Mitchell Wise2☯, Alfonso Cuesta-Marcos1, Matthew Geniza3, Tom Blake4, Victoria C

Sediment size fractionation and focusing in the equatorial Pacific: Effect on ²³⁰Th normalization and paleoflux measurements

Creator:: Lyle, Mitchell, Marcantonio, Franco, Moore, Willard S., Murray, Richard W., Huh, Chih-An, Finney, Bruce P., Murray, David W., and Mix, Alan C.
Abstract:: We use flux, dissolution, and excess ²³⁰Th data from the Joint Global Ocean Flux Study and Manganese Nodule Project equatorial Pacific study Site C to assess the extent of sediment focusing in the equatorial Pacific. Measured mass accumulation rates (MAR) from sediment cores were compared to reconstructed MAR by multiplying...
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Full Text:: ., Marcantonio, F., Moore, W. S., Murray, R. W., Huh, C. A., Finney, B. P., ... & Mix, A. C. (2014). Sediment

High-resolution infrared studies of perdeutero-spiropentane, C₅D₈

Creator:: Erickson, Blake Alexander, Ju, X., Nibler, Joesph W., Beaudry, C. M., and Blake, T. A.
Abstract:: Perdeutero-spiropentane (C₅D₈) has been synthesized and infrared and Raman spectra are reported for the first time. Wavenumber assignments are made for most of the fundamental vibrational modes. Gas phase infrared spectra were recorded at a resolution (0.002 cm⁻¹) sufficient to resolve individual rovibrational lines and show evidence of strong Coriolis...
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Full Text:: . Staroverov, T. Keith, R. Kobayashi, J. Normand, K. Raghavachari, A. Rendell, J. C. Burant, S. S. Iyengar

Draft Genome Sequence of Streptomyces sp. Strain ventii, Isolated from a Microbial Mat near Hydrothermal Vents within the Axial Seamount in the Pacific Ocean, and Resequencing of the Type Strains Streptomyces lonarensis NCL 716 and Streptomyces bohaiensis 11A07

Creator:: Loughran, Rachel M., Mitchell, Edward A., Vining, Oliver B., Gallegos, David A., Deadmond, Monica C., Wasson, Benjamin J., Pfannmuller, Kaysa M., Paddock, Brie E., Koyack, Marc J., Oline, David K., Ushijima, Blake, Saw, Jimmy H., McPhail, Kerry L., and Videau, Patrick
Abstract:: The draft genome of Streptomyces sp. strain ventii, an environmental isolate recovered from deep-sea hydrothermal vents in the Pacific Ocean, is presented along with the resequenced draft genomes of the type strains Streptomyces bohaiensis 11A07 and Streptomyces lonarensis NCL 716.
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Full Text:: 11A07 Rachel M. Loughran,a Edward A. Mitchell,b Oliver B. Vining,b David A. Gallegos,b Monica C

Stoichiometry of C, N, P, and Si fluxes in a temperate-climate embayment

Creator:: Smith, S. V., Wiebe, W. J., Hollibaugh, J. T., Dollar, S. J., Hager, S. W., Cole, B. E., Tribble, G. W., and Wheeler, Patricia A.
Abstract:: Dissolved C, N, P, and Si budgets for Tomales Bay, California, have been used to solve simultaneous stoichiometric equations which describe a plausible material balance for net organic matter reactions in the bay. Dissolved Si and P were both exported hydrographically. Dissolved C and fixed N were imported hydrographically. If...
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Full Text:: . Hollibaugh3, S. J. Dollarl, S. W. Hager4, B. E. Cole4, G. W. Tribble', P. A. Wheeler5 ABSTRACT Dissolved C, N

Characterizing perpendicular-to-grain compression (C-perpendicular to) behavior in wood construction

Creator:: Basta, Craig Thomas, Gupta, Rakesh, Leichti, Robert J., and Sinha, Arijit
Abstract:: Current compression perpendicular-to-grain (C-perpendicular to) design values for wood members are based on mean stress obtained from ASTM D143 specimen. The standard ASTM test with metal on wood bearing has limited applicability in modern construction assemblies with C-perpendicular to loading scenarios. Previous work has shown that end-bearing conditions and wood-on-wood...
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Full Text:: Thomas Basta1, Rakesh Gupta1, Robert J. Leichti2 and Arijit Sinha1,* 1 Department of Wood Science and

Fatigue Crack Growth Mechanisms for Nickel-based Superalloy Haynes 282 at 550-750° C

Creator:: Rozman, Kyle A., Kruzic, Jamie J., Sears, John S., and Hawk, Jeffrey A.
Abstract:: The fatigue crack growth rates for nickel-based superalloy Haynes 282 were measured at 550, 650, and 750 °C using compact tension specimens with a load ratio of 0.1 and cyclic loading frequencies of 25 and 0.25 Hz. The crack path was observed to be primarily transgranular for all temperatures, and...
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Full Text:: Superalloy Haynes 282 at 550-750° C Rozman, K. A., Kruzic, J. J., Sears, J. S., & Hawk, J. A. (2015

Complementary constraints from carbon ¹³C and nitrogen ¹⁵N isotopes on the glacial ocean's soft-tissue biological pump

Creator:: Schmittner, A. and Somes, C. J.
Abstract:: A three-dimensional, process-based model of the ocean’s carbon and nitrogen cycles, including 13C and 15N isotopes, is used to explore effects of idealized changes in the soft-tissue biological pump. Results are presented from one preindustrial control run (piCtrl) and six simulations of the Last Glacial Maximum (LGM) with increasing values...
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Non-random biodiversity loss underlies predictable increases in viral disease prevalence

Creator:: Lacroix, Christelle, Jolles, Anna, Seabloom, Eric W., Power, Alison G., Mitchell, Charles E., and Borer, Elizabeth T.
Abstract:: Disease dilution (reduced disease prevalence with increasing biodiversity) has been described for many different pathogens. Although the mechanisms causing this phenomenon remain unclear, the disassembly of communities to predictable subsets of species, which can be caused by changing climate, land use, or invasive species, underlie one important hypothesis. In this...
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Full Text:: disease prevalence Lacroix, C., Jolles, A., Seabloom, E. W., Power, A. G., Mitchell, C. E., & Borer, E

Associations between Mycobacterium avium subsp. paratuberculosis antibodies in bulk tank milk, season of sampling and protocols for managing infected cows

Creator:: Cazer, Casey L., Mitchell, Rebecca M., Cicconi-Hogan, Kellie M., Gamroth, Michael, Richert, Roxann M., Ruegg, Pamela L., and Schukken, Ynte H.
Abstract:: BACKGROUND: The objective of this study was to identify associations between the concentration of Mycobacterium avium subsp. paratuberculosis (MAP) antibodies in bulk milk and potential risk factors in herd management and herd characteristics, explaining high MAP antibody titers in milk. An extensive questionnaire was administered to 292 organic and conventional...
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Full Text:: reproduction and culling in dairy cattle. J Dairy Sci 2010, 93:3513–3524. 3. Collins MT: Clinical approach to

δ¹³C record of Upper North Atlantic Deep Water during the past 2.6 million years

Creator:: Oppo, D. W., Raymo, M. E., Lohmann, G. P., Mix, Alan C., Wright, J. D., and Prell, W. L.
Abstract:: Benthic foraminiferal δ¹³C data from site 502 in the Caribbean Sea (sill depth 1800 m) indicate that throughout the past 2.6 m.y., glacial δ¹³C values in the middepth Atlantic were higher during glaciations than interglaciations. This is interpreted as indicating a greater proportion of Upper North Atlantic Deep Water (UNADW)...
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Full Text:: , 1 M. E. Raymo,2 G. P. Lohmann, 1 A. C. Mix, 3 J. D. Wright,4 and W. L. Prell5 Abstract. Benthic

Distinct Argonaute-mediated 22G-RNA pathways direct genome surveillance in the C. elegans germline

Creator:: Gu, Weifeng, Shirayama, Masaki, Conte Jr., Darryl, Vasale, Jessica, Batista, Pedro J., Claycomb, Julie M., Moresco, James J., Youngman, Elaine, Keys, Jennifer, Stoltz, Matthew J., Chen, Chun-Cheih G., Chaves, Daniel A., Duan, Shenghua E., Kasschau, Krisitin D., Fahlgren, Noah, Yates III, John R., Mitani, Shohei, Carrington, James C., and Mello, Craig C.
Abstract:: Endogenous small RNAs (endo-siRNAs) interact with Argonaute (AGO) proteins to mediate sequence-specific regulation of diverse biological processes. Here, we combine deep-sequencing and genetic approaches to explore the biogenesis and function of endo-siRNAs in C. elegans. We describe conditional alleles of the dicer-related helicase, drh-3, that abrogate both RNA interference and...
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Full Text:: of secondary small interfering RNAs in C. elegans. EMBO J 2007;26:5007–5019. [PubMed: 18007599

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

Creator:: Hall, L. S., Mahoney, J. J., Sinton, J. M., and Duncan, Robert A.
Abstract:: Lavas of the Rano Rahi seamount field define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6–28 Ma lavas of the Pukapuka ridge system, situated between the seamount field and French Polynesia. Dating of Rano Rahi samples by ⁴⁰Ar-³⁹Ar...
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Full Text:: gc000994 1..27 Spatial and temporal distribution of a C-like

Constraints on the Late Holocene Anthropogenic Contribution to the Atmospheric Methane Budget

Creator:: Mitchell, Logan, Brook, Edward J., Lee, James E., Buizert, Christo, and Sowers, Todd
Abstract:: The origin of the late pre-industrial Holocene (LPIH) increase in atmospheric methane concentrations has been much debated. Hypotheses invoking changes in solely anthropogenic sources or solely natural sources have been proposed to explain the increase in concentrations. Here two high-resolution, high-precision ice core methane concentration records from Greenland and Antarctica...
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