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Ecology Department: Research Summaries 2004-2005

Program Overview
Ernie Majer

U-Th/He Geochronology of Young Volcanic Rocks
Sarah Aciego, Donald J. DePaolo, and B. Mack Kennedy

Monitoring Microbial Degradation of Chlorinated Solvents with Carbon Isotopes
Mark Conrad, Patrick Lee, Shaily Mahendra, Kung-Hui Chu, and Lisa Alvarez-Cohen

Uranium Isotope Comminution Ages: A New Way to Study Sedimentation Processes
Donald J. DePaolo, Katherine Maher, and John N. Christensen

Flowing-Fluid Electric-Conductivity Logging for Hydrologic Characterization of Fracture Rock
Christine Doughty and Chin-Fu Tsang

Xenon Isotopes Released from Buried Transuranic Waste
Evan Dresel and B. Mack Kennedy

Regional Trends in Helium Isotopes: Evidence for Deep Permeability in the Basin and Range
B. Mack Kennedy and M. C. van Soest

Studies of the Formation, Structure, and Reactivity of Nanoparticulate Goethite
Christopher Kim, Glenn Waychunas, and Jillian Banfield

Tube-Wave Effects in Crosswell Seismic Data
Valeri Korneev

Lattice-Boltzmann Simulation of Isotopic Kinetics in Crystal Growth
Guoping Lu, Donald J. DePaolo, Qinjun Kang, and Dongxiao Zhang

The Mineral Dissolution Rate Conundrum
Kate Maher, Carl I. Steefel, and Donald J. DePaolo

Split Hopkinson Resonant Bar Experiment for Fracture Poroelasticity
Seiji Nakagawa, Kurt T. Nihei, and Larry R. Myer

Unprecedented Quartz/Water Interface Structure Determined by Phase-Sensitive Sum Frequency Vibrational Spectroscopy
Victor Ostroverkhov, Glenn Waychunas, and Yuen Ron Shen

Infiltration Flux Distributions in Unsaturated Rocks
Tetsu K. Tokunaga, Keith R. Olson, and Jiamin Wan

Intragranular Diffusion of Uranium in Sands
Tetsu K. Tokunaga, Jiamin Wan, Stephen R. Sutton, and Matt Newville

Natural Abundance and Mobile Fractions of Nanoparticles in Soils
Jiamin Wan, Zuoping Zheng, and Tetsu K. Tokunaga

As(V) Sorption on Hematite: Complexation Geometry Obtained from Combined Surface X-Ray Diffraction and Grazing-Incidence X-Ray Absorption Spectroscopy
Glenn Waychunas, Tom Trainor, Peter Eng, James Davis, and John Bargar

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