Index Catalog // ScholarsArchive@OSU

Catalyst selective and regiodivergent O- to C- or N-carboxyl transfer of pyrazolyl carbonates: synthetic and computational studies

Creator:: Gould, Eoin, Walden, Daniel M., Kasten, Kevin, Johnston, Ryne C., Wu, Jiufeng, Slawin, Alexandra M., Mustard, Thomas J. L., Johnston, Brittany, Davies, Tony, Cheong, Paul Ha-Yeon, and Smith, Andrew D.
Abstract:: The regiodivergent O- to C- or N-carboxyl transfer of pyrazolyl carbonates is described, with DMAP giving preferential N-carboxylation and triazolinylidenes promoting selective C-carboxylation (both with up to >99 : 1 regioselectivity). An enantioselective O- to C-carboxyl variant using NHC catalysis is demonstrated (up to 92% ee), while mechanistic and DFT studies outline...
Resource Type:: Article
Full Text:: O- to C- or N-carboxyl transfer of pyrazolyl carbonates: synthetic and computational studies

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...
Resource Type:: Article
Full Text:: ) 2013. CC Attribution 3.0 License. Climate of the Past O pen A ccess High-resolution glacial and

Transmission Power Control with the Guaranteed Communication Reliability in WSN

Creator:: Kim, Dae-Young, Jin, Zilong, Choi, Jungwook, Lee, Ben, and Cho, Jinsung
Abstract:: In a wireless sensor network, sensor nodes are deployed in an ad hoc fashion and they deliver data packets using multihop transmission. However, transmission failures occur frequently in the multihop transmission over wireless media. Thus, a loss recovery mechanism is required to provide end-to-end reliability. In addition, because the sensor...
Resource Type:: Article
Full Text:: WSN Kim, D. Y., Jin, Z., Choi, J., Lee, B., & Cho, J. (2015). Transmission Power Control with the

Ultraviolet Radiation Influences Perch Selection by a Neotropical Poison-Dart Frog

Creator:: Kats, Lee B., Bucciarelli, Gary M., Schlais, David E., Blaustein, Andrew R., and Han, Barbara A.
Abstract:: Ambient ultraviolet-B radiation can harm amphibian eggs, larvae and adults. However, some amphibians avoid UV-B radiation when given the opportunity. The strawberry poison dart frog, Oophaga pumilio, is diurnal and males vocalize throughout the day in light gaps under forest canopies that expose them to solar radiation. Previous studies have...
Resource Type:: Article
Full Text:: Selection by a Neotropical Poison-Dart Frog Lee B. Kats1*, Gary M. Bucciarelli2, David E. Schlais1, Andrew R

Experimental Study on Detection of Deterioration in Concrete Using Infrared Thermography Technique

Creator:: Huh, Jungwon, Tran, Quang Huy, Lee, Jong-Han, Han, DongYeob, Ahn, Jin-Hee, and Yim, Solomon
Abstract:: Concrete is certainly prone to internal deteriorations or defects during the construction and operating periods. Compared with other nondestructive techniques, infrared thermography can easily detect the subsurface delamination in a very short period of time, but accurately identifying its size and depth in concrete is a very challenging task. In...
Resource Type:: Article
Full Text:: Jong-Han Lee,2 DongYeob Han,1 Jin-Hee Ahn,3 and Solomon Yim4 1Department of Ocean Civil Engineering

Mechanistic Insights into Validoxylamine A 7’-Phosphate Synthesis by VldE Using the Structure of the Entire Product Complex

Creator:: Cavalier, Michael C., Yim, Young-Sun, Asamizu, Shumpei, Neau, David, Almabruk, Khaled H., Mahmud, Taifo, and Lee, Yong-Hwan
Abstract:: The pseudo-glycosyltransferase VldE catalyzes non-glycosidic C-N coupling between an unsaturated cyclitol and a saturated aminocyclitol with the conservation of the stereochemical configuration of the substrates to form validoxylamine A 7'-phosphate, the biosynthetic precursor of the antibiotic validamycin A. To study the molecular basis of its mechanism, the three-dimensional structures of...
Resource Type:: Article
Full Text:: ) ND2 N2 (3.4) Asp360 O O6 (3.3) Asn361 OD1 N1 (2.6) OD1 N2 (2.9) Asp362 N O6 (2.9) O O6 (3.2

The plant phenology monitoring design for The National Ecological Observatory Network

Creator:: Elmendorf, Sarah C., Jones, Katherine D., Cook, Benjamin I., Diez, Jeffrey M., Enquist, Carolyn A. F., Hufft, Rebecca A., Jones, Matthew O., Mazer, Susan J., Miller-Rushing, Abraham J., Moore, David J. P., Schwartz, Mark D., and Weltzin, Jake F.
Abstract:: Phenology is an integrative science that comprises the study of recurring biological activities or events. In an era of rapidly changing climate, the relationship between the timing of those events and environmental cues such as temperature, snowmelt, water availability, or day length are of particular interest. This article provides an...
Resource Type:: Article
Full Text:: Matthew O. Jones,8 Susan J. Mazer,9 Abraham J. Miller-Rushing,10 David J. P. Moore,11 Mark D. Schwartz

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

Creator:: Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, Edward J., Buchardt, S. L., Buizert, Christo, Chappellaz, J., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T., Seierstad, I. K., Severinghaus, J. P., Steffensen, J. P., Stowasser, C., Svensson, A., Vallelonga, P., Vinther, B. M., Wilhelms, F., and Winstrup, M.
Abstract:: A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified...
Resource Type:: Article

Where to find 1.5 million yr old ice for the IPICS “Oldest-Ice” ice core

Creator:: Fischer, H., Severinghaus, J., Brook, Edward J., Wolff, E., Albert, M., Alemany, O., Arthern, R., Bentley, C., Blankenship, D., Chappellaz, J., Creyts, T., Dahl-Jensen, D., Dinn, M., Frezzotti, M., Fujita, S., Gallee, H., Hindmarsh, R., Hudspeth, D., Jugie, G., Kawamura, K., Lipenkov, V., Miller, H., Mulvaney, R., Parrenin, F., Pattyn, F., Ritz, C., Schwander, J., Steinhage, D., van Ommen, T., and Wilhelms, F.
Abstract:: The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still...
Resource Type:: Article

The status and challenge of global fire modelling

Creator:: Hantson, Stijn, Arneth, Almut, Harrison, Sandy P., Kelley, Douglas I., Prentice, I. Colin, Rabin, Sam S., Archibald, Sally, Mouillot, Florent, Arnold, Steve R., Artaxo, Paulo, Bachelet, Dominique, Ciais, Philippe, Forrest, Matthew, Friedlingstein, Pierre, Hickler, Thomas, Kaplan, Jed O., Kloster, Silvia, Knorr, Wolfgang, Lasslop, Gitta, Li, Fang, Mangeon, Stephane, Melton, Joe R., Meyn, Andrea, Sitch, Stephen, Spessa, Allan, van der Werf, Guido R., Voulgarakis, Apostolos, and Yue, Chao
Abstract:: Biomass burning impacts vegetation dynamics, biogeochemical cycling, atmospheric chemistry, and climate, with sometimes deleterious socio-economic impacts. Under future climate projections it is often expected that the risk of wildfires will increase. Our ability to predict the magnitude and geographic pattern of future fire impacts rests on our ability to model...
Resource Type:: Article
Full Text:: , Thomas Hickler14,16, Jed O. Kaplan17, Silvia Kloster18, Wolfgang Knorr19, Gitta Lasslop18, Fang Li20

ScholarsArchive@OSU

Catalyst selective and regiodivergent O- to C- or N-carboxyl transfer of pyrazolyl carbonates: synthetic and computational studies

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

Transmission Power Control with the Guaranteed Communication Reliability in WSN

Ultraviolet Radiation Influences Perch Selection by a Neotropical Poison-Dart Frog

Experimental Study on Detection of Deterioration in Concrete Using Infrared Thermography Technique

Mechanistic Insights into Validoxylamine A 7’-Phosphate Synthesis by VldE Using the Structure of the Entire Product Complex

The plant phenology monitoring design for The National Ecological Observatory Network

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

Where to find 1.5 million yr old ice for the IPICS “Oldest-Ice” ice core

The status and challenge of global fire modelling

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