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Filtering by: Publisher Mongolian Academy of Science Remove constraint Publisher: Mongolian Academy of Science Has journal sim Proceedings of the National Academy of Sciences of the United States of America Remove constraint Has journal sim: Proceedings of the National Academy of Sciences of the United States of America

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The Irish potato famine pathogen Phytophthora infestans originated in central Mexico rather than the Andes

Creator:

Goss, Erica M., Tabima, Javier F., Cooke, David E. L., Restrepo, Silvia, Fry, William E., Forbes, Gregory A., Fieland, Valerie J., Cardenas, Martha, and Grünwald, Niklaus J.

Abstract:

Phytophthora infestans is a destructive plant pathogen best known for causing the disease that triggered the Irish potato famine and remains the most costly potato pathogen to manage worldwide. Identification of P. infestan’s elusive center of origin is critical to understanding the mechanisms of repeated global emergence of this pathogen....

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Academy of Sciences, 111(24). doi:10.1073/pnas.1401884111 10.1073/pnas.1401884111 National Academy of
Developing a broader scientific foundation for river restoration: Columbia River food webs

Creator:

Naiman, Robert J., Alldredge, J. Richard, Beauchamp, David A., Bisson, Peter A., Congleton, James, Henny, Charles J., Huntly, Nancy, Lamberson, Roland, Levings, Colin, Merrill, Erik N., Pearcy, William G., Rieman, Bruce E., Ruggerone, Gregory T., Scarnecchia, Dennis, Smouse, Peter E., and Wood, Chris C.

Abstract:

Well-functioning food webs are fundamental for sustaining rivers as ecosystems and maintaining associated aquatic and terrestrial communities. The current emphasis on restoring habitat structure-without explicitly considering food webs-has been less successful than hoped in terms of enhancing the status of targeted species and often overlooks important constraints on ecologically effective...

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Article

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) Restoration of ecosystem services for environmental markets. Science 325(5940): 575–576. 4. Palmer MA (2010
Global climate evolution during the last deglaciation

Creator:

Clark, Peter U., Shakun, Jeremy D., Baker, Paul A., Bartlein, Patrick J., Brewer, Simon, Brook, Edward J., Carlson, Anders E., Cheng, Hai, Kaufman, Darrell S., Liu, Zhengyu, Marchitto, Thomas M., Mix, Alan C., Morrill, Carrie, Otto-Bliesner, Bette L., Pahnke, Katharina, Russell, James M., Whitlock, Cathy, Adkins, Jess F., Blois, Jessica L., Clark, Jorie, Colman, Steven M., Curry, William B., Flower, Ben P., He, Feng, Johnson, Thomas C., Lynch-Stieglitz, Jean, Markgraf, Vera, McManus, Jerry, Mitrovica, Jerry X., Moreno, Patricio I., and Williams, John W.

Abstract:

Deciphering the evolution of global climate from the end of the Last Glacial Maximum approximately 19 ka to the early Holocene 11 ka presents an outstanding opportunity for understanding the transient response of Earth's climate system to external and internal forcings. During this interval of global warming, the decay of...

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; vCollege of Marine Science, University of South Florida, St. Petersburg, FL 33701; wSchool of Earth and
Small RNAs serve as a genetic buffer against genomic shock in Arabidopsis interspecific hybrids and allopolyploids

Creator:

Ha, Misook, Lu, Jie, Ramachandran, Vanitharani, Kasschau, Krisitin D., Chapman, Elisabeth J., Carrington, James C., Chen, Xuemei, Wang, Xue-Jei, and Chen, Z. Jeffrey

Abstract:

Small RNAs, including microRNAs (miRNAs), small interfering RNAs (siRNAs), and trans-acting siRNAs (tasiRNAs), control gene expression and epigenetic regulation. Although the roles of miRNAs and siRNAs have been extensively studied, their expression diversity and evolution in closely related species and interspecific hybrids are poorly understood. Here, we show comprehensive analyses...

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Article

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Genetics and Developmental Biology, Chinese Academy of Sciences, 5 Datun Road, Chaoyang District, Beijing
Identification of MIR390a precursor processing defective mutants in Arabidopsis by direct genome sequencing

Creator:

Cuperus, Josh T., Montgomery, Taiowa A., Fahlgren, Noah, Burke, Russell T., Townsend, Tiffany, Sullivan, Christopher M., and Carrington, James C.

Abstract:

Transacting siRNA (tasiRNA) biogenesis in Arabidopsis is initiated by microRNA (miRNA) –guided cleavage of primary transcripts. In the case of TAS3 tasiRNA formation, ARGONAUTE7 (AGO7)– miR390 complexes interact with primary transcripts at two sites, resulting in recruitment of RNA-DEPENDENT RNA POLYMERASE6 for dsRNA biosynthesis. An extensive screen for Arabidopsis mutants...

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by grants from the National Science Foundation (MCB-0618433), National Institutes of Health (AI43288
Benthic-Pelagic Links and Rocky Intertidal Communities: Bottom-Up Effects on Top-Down Control?

Creator:

Menge, Bruce A., Daley, Bryon A., Wheeler, Patricia A., Dahlhoff, Elizabeth, Sanford, Eric, and Strub, P. Ted

Abstract:

Insight into the dependence of benthic communities on biological and physical processes in nearshore pelagic environments, long considered a ``black box,'' has eluded ecologists. In rocky intertidal communities at Oregon coastal sites 80 km apart, differences in abundance of sessile invertebrates, herbivores, carnivores, and macrophytes in the low zone were...

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this fact. © 1997 by The National Academy of Sciences 0027-8424y97y9414530-6$2.00y0 PNAS is available
Gases in ice cores

Creator:

Bender, Michael, Sowers, Todd, and Brook, Edward J.

Abstract:

Air trapped in glacial ice offers a means of reconstructing variations in the concentrations of atmospheric gases over time scales ranging from anthropogenic (last 200 yr) to glacial/interglacial (hundreds of thousands of years). In this paper, we review the glaciological processes by which air is trapped in the ice and...

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,’’ organized by Charles D. Keeling, held November 13–15, 1995, at the National Academy of Sciences, Irvine, CA
Delayed upwelling alters nearshore coastal ocean ecosystems in the northern California current

Creator:

Barth, John A., Menge, Bruce A., Lubchenco, Jane, Chan, Francis, Bane, John M., Kirincich, Anthony R., McManus, Margaret A., Nielsen, Karina J., Pierce, Stephen D., and Washburn, Libe

Abstract:

Wind-driven coastal ocean upwelling supplies nutrients to the euphotic zone near the coast. Nutrients fuel the growth of phytoplankton, the base of a very productive coastal marine ecosystem [Pauly D, Christensen V (1995) Nature 374:255–257]. Because nutrient supply and phytoplankton biomass in shelf waters are highly sensitive to variation in...

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Geophys Union 83(Suppl):OS12K-03 (abstr.). © 2007 by The National Academy of Sciences of the USA
Neoliberal Policy, Rural Livelihoods and Urban Food Security in West Africa: A Comparative Study of The Gambia, Côte d’Ivoire and Mali

Creator:

Moseley, William G., Carney, Judith, and Becker, Laurence

Abstract:

This study examines the impact of two decades of neoliberal policy reform on food production and household livelihood security in three West African countries. The rice sectors in The Gambia, Côte d’Ivoire, and Mali are scrutinized as well as cotton and its relationship to sorghum production in Mali. Although market...

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1 SOCIAL SCIENCES: Sustainability Science
Jet stream intraseasonal oscillations drive dominant ecosystem variations in Oregon’s summertime coastal upwelling system

Creator:

Bane, John M., Spitz, Yvette H., Letelier, Ricardo M., and Peterson, William T.

Abstract:

Summertime wind stress along the coast of the northwestern United States typically exhibits intraseasonal oscillations (ISOs) with periods from ≈15 to 40 days, as well as fluctuations on the 2- to 6-day “weather-band” and 1-day diurnal time scales. Coastal upwelling of cool, nutrient-rich water is driven by extended periods of...

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. †To whom correspondence should be addressed. E-mail: bane@unc.edu. © 2007 by The National Academy of

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Botany and Plant Pathology2
College of Earth, Ocean, and Atmospheric Sciences1
College of Oceanic and Atmospheric Sciences1
Geosciences1

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Brook, Edward J.3
Bane, John M.2
Carlson, Anders E.2
Carrington, James C.2
Clark, Peter U.2
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