Showing 5641 - 5650 of 5831 Items

Report of the President, Bowdoin College 1965-1966

Date: 1966-01-01

Access: Open access



Bowdoin College - Medical School of Maine Catalogue (1916-1917)

Date: 1918-01-01

Access: Open access

Bowdoin College Bulletin no. 68


Bowdoin College - Medical School of Maine Catalogue (1920-1921)

Date: 1921-01-01

Access: Open access

Bowdoin College Bulletin no. 104


Bowdoin College Catalogue (1919-1920)

Date: 1920-01-01

Access: Open access

Bowdoin College Bulletin no. 95


Report of the President, Bowdoin College 1963-1964

Date: 1964-01-01

Access: Open access



Responses of stomatal features and photosynthesis to porewater N enrichment and elevated atmospheric CO2 in Phragmites australis, the common reed

Date: 2021-04-01

Creator: Julian R. Garrison, Joshua S. Caplan, Vladimir Douhovnikoff, Thomas J. Mozdzer, Barry A. Logan

Access: Open access

PREMISE: Biological invasions increasingly threaten native biodiversity and ecosystem services. One notable example is the common reed, Phragmites australis, which aggressively invades North American salt marshes. Elevated atmospheric CO2 and nitrogen pollution enhance its growth and facilitate invasion because P. australis responds more strongly to these enrichments than do native species. We investigated how modifications to stomatal features contribute to strong photosynthetic responses to CO2 and nitrogen enrichment in P. australis by evaluating stomatal shifts under experimental conditions and relating them to maximal stomatal conductance (gwmax) and photosynthetic rates. METHODS: Plants were grown in situ in open-top chambers under ambient and elevated atmospheric CO2 (eCO2) and porewater nitrogen (Nenr) in a Chesapeake Bay tidal marsh. We measured light-saturated carbon assimilation rates (Asat) and stomatal characteristics, from which we calculated gwmax and determined whether CO2 and Nenr altered the relationship between gwmax and Asat. RESULTS: eCO2 and Nenr enhanced both gwmax and Asat, but to differing degrees; gwmax was more strongly influenced by Nenr through increases in stomatal density while Asat was more strongly stimulated by eCO2. There was a positive relationship between gwmax and Asat that was not modified by eCO2 or Nenr, individually or in combination. CONCLUSIONS: Changes in stomatal features co-occur with previously described responses of P. australis to eCO2 and Nenr. Complementary responses of stomatal length and density to these global change factors may facilitate greater stomatal conductance and carbon gain, contributing to the invasiveness of the introduced lineage.


Report of the President, Bowdoin College 1974-1975

Date: 1975-01-01

Access: Open access



Bowdoin College Catalogue (1831 Apr)

Date: 1831-04-01

Access: Open access



Measurement of cabibbo-suppressed decays of the τ lepton

Date: 1994-01-01

Creator: M. Battle, J. Ernst, Y. Kwon, S. Roberts, E. H., Thorndike, C. H. Wang, J. Dominick, M. Lambrecht, S. Sanghera, V. Shelkov, T. Skwarnicki, R. Stroynowski, I. Volobouev, G. Wei, P. Zadorozhny, M. Artuso, M. Goldberg, D. He, N. Horwitz, R. Kennett, R. Mountain, G. C. Moneti, F. Muheim, Y. Muheim, S. Playfer, Y. Rozen, S. Stone, M. Thulasidas, G. Vasseur, G. Zhu, J. Bartelt

Access: Open access

Branching ratios for the dominant Cabibbo-suppressed decays of the τ lepton have been measured by CLEO II in e+e- annihilation at the Cornell Electron Storage Ring (s∼10.6 GeV) using kaons with momenta below 0.7 GeV/c. The inclusive branching ratio into one charged kaon is (1.60 ± 0.12 ± 0.19)%. For the exclusive decays, B(τ-→K-ντ)=(0.66±0.07±0.09)%, B(τ-→K-π0ντ)=(0.51±0.10±0.07)%, and, based on three events, B(τ-→K-2π0ντ)<0.3% at the 90% confidence level. These represent significant improvements over previous results. B(τ-→K-π0ντ) is measured for the first time with exclusive π0 reconstruction. © 1994 The American Physical Society.


Bowdoin College Catalogue (1937-1938)

Date: 1938-01-01

Access: Open access

Bowdoin College Bulletin no. 240