John Stanford, Predoctoral Fellow, University of Georgia. "A 



Study of the Scattering of Heavy Ion Projectiles by Atoms," 

 with Alexander Dalgarno, from September 1, 1989 to August 

 31, 1990. 



Tang Guoqiang, Visiting Scientist, Chalmers University of 



Technology. "Differential VLBI Measurements of the Quasar 

 4C39.25," with Irwin Shapiro, from June 15 to September 28, 

 1989. 



Sanjay Wagh, International Exchange Visitor, University of Poona. 

 H CCD Studies of Active Galaxies and Quasars," with Martin 

 Elvis, from March 15 to September 15, 1989. 



John Wardle, Visiting Scientist, University of Manchester. "Dual 

 Wavelength, Polarization Sensitive VLBI Experiment," with 

 James Moran, from May 1 to September 30, 1989. 



Ann Zabludoff, Visiting Student, Massachusetts Institute of 



Technology. "The Complex Dynamics of Large Structures, 

 Clusters of Galaxies, and Superclusters, " with M.J. Geller, 

 from October 1, 1988 to August 31, 1989. 



SMITHSONIAN ENVIRONMENTAL RESEARCH CENTER 



Shiyue Cai, International Exchange visitor, Zhejiang Agricultural 

 University. "The Impact of Acid Atmospheric Deposition in 

 the Physiology of the Root Hairs of Higher Plants," with 

 David Correll, from March 29 to September 28, 1989. 



Felix Dapare Dakora, Visiting Scientist, University of Western 

 Australia. "The Effect of Elevated C02 Concentration in 

 Nitrogen Metabolism of Marsh Plants in Natural Ecosystems 

 of the Chesapeake Bay," with Bert Drake, from December 1, 

 1989 to November 30, 1990. 



Lucia Dillenburg, Predoctoral Fellow, University of Maryland. 



"Physiological Ecology of Vine and Tree Competition," with 

 Dennis Whigham, from November 14, 1988 to May 13, 1990. 



Joseph Dineen, Jr., Postdoctoral Fellow, University of Maryland. 

 "Investigation of Barnacle Larval Settlement Relevant to 

 Adult Zonation in the Chesapeake Bay," with Anson Hines, 

 from October 1, 1989 to September 30, 1990. 



Anna Dittel, Postdoctoral Fellow, University of Delaware. 



"Microhabitat Selection for Molting by Blue Crab Juveniles 

 (Callinectes sapidus) in the Rhode River Estuary, 

 Chesapeake Bay," with Anson Hines, From September 10, 1989 

 to September 9, 1990. 



6o 



