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John A O'Rourke
(1924-1998)
John A. O'Rourke, 74, Los Alamos, NM, died on September 8, 1998.
After military service in the U. S. Army during World War II,
he completed his Professional Engineering degree in Metallurgy
and attended graduate school at the Colorado School of Mines
in Golden, CO, earning a Master of Science degree in 1950. From
1950-52 he was a staff scientist with General Electric at the
Hanford Facility in Richland, WA. In December 1952 he began work
at Los Alamos National Laboratory as a technical staff member.
With a strong background in metallurgy and materials science,
his work spanned numerous Laboratory groups and programs and
involved structural investigations of materials by methods of
X-ray diffraction and spectroscopy. He specialized in pole figure
analysis and X-ray crystallography in support of solid state
research. O'Rouke retired in December 1987 but worked as a Laboratory
Associate until he fully retired in October 1995. He had been
a member of the ACA since 1986.
Patricia O'Rourke
Update to E-mail
Addresses
Corrections for e-mail addresses in the rosters printed in the
Spring Newsletter (pages 3-5): Abe Clearfield: clearfield@chemvx.tamu.edu
and I. David Brown: idbrown@mcmaster.ca
Errata: The Mechanism of Beevers-Lipson
Strips
An error in the Beevers-Lipson Strips story in the Spring issue
of the ACA Newsletter (page 11-12) has been pointed out by Mike
Bennett. In copying the original article from the BCA Newletter,
the minus signs were omitted from the right half of the third
strip in the example summation. The corrected figure is shown
here.
46 C 0 46 46 46 46 46 46 46 46 46 46 46 46 46
46 46 46
__ __ __ __ __ __ __ __ __ __ __ __ __ __
_ _
35 C 1 35 35 34 33 32 29 27 26 23 21 17 14 11 7 4 0
_ _ __ __ __ __ __ __
28 C 2 28 27 26 23 19 14 9 3 3 9 14 19 23 26 27 28
__ __ __ __ __ _
19 C 3 19 18 15 13 6 0 6 13 15 18 19 18 15 13 6 0
sum: 20 20 23 23 27 30 33 36 35 34 33 31 27
25 21 18
Ron Stenkamp
ACA 2001 - Los Angeles, CA
The ACA Council is pleased to announce that Katherine Kantardjieff
(CSU-Fullerton) and Dan Anderson (UCLA) have agreed to be Co-
Local Chairs, and Duncan McRee (Scripps) will be the Program
Chair for the 2001 Los Angeles meeting.
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1999 ACA Transactions Symposium: Two Decades
of Synchrotron Radiation Research
Synchrotron radiation sources have played an increasingly important
role in studies that utilize X-rays for experimental measurements.
Materials science, biology, chemistry and physics have all benefited
from these powerful X-ray sources. For the past two decades,
synchrotron radiation sources have provided unique opportunities
for a broad community of scientists resulting in new and exciting,
and often pivotal findings. The symposium in Buffalo, organized
by Steve Ealick and John Helliwell, featured accomplishments
resulting from the study of matter using synchrotron radiation.
Both historical perspectives and recent results were presented.
Reserve your copy of the ACA Transactions now.
What's on
the Cover
Upper Left: The availability of synchrotron
X-ray sources has renewed interest in the Laue diffraction method.
The method makes optimum use of the polychromatic radiation spectrum
and permits very brief exposures, even for weakly scattering
crystals. This figure shows a Laue diffraction pattern color
simulation (coded blue = short X-ray wavelength through the rainbow
colors to long wavelength) for pea lectin (Cruickshank, D. W.
J., Helliwell, J. R., and Moffat, K. (1991) Acta Cryst. A47,
352-373).
Upper Right: Ribbon diagram of the trimeric human purine
nucleoside phosphorylase based on data from the Daresbury SRS.
Weakly diffracting protein crystals due to 78% solvent (Ealick,
S. E., Rule, S.A., Carter, D. C., Greenhough, T. J., Babu, Y.
S., Cook, W. J., Habash, J., Helliwell, J. R., Stoeckler, J.
D., Parks, R. E. Jr., Chen, S. and Bugg, C. E. (1990) J. Biol.
Chem., 265, 1812-1820).
Lower Left: The crystal structures of nickel octahexylphthalocyanine
at 295 and 103° K show a space group difference, which gives
insight into the thermotropic transition to the liquid crystal
mesophase. The 103° K structure was determined to high precision,
using SR and a CCD detector. The figure shows a monochromatic
rotation diffraction pattern recorded at CHESS Multipole Wiggler
Station F2 on a CCD from a small weakly diffracting crystal.
(Helliwell, M., Deacon, A., Moon, K. J., Powell, A, K., and Cook,
M. J. (1997) Acta Cryst., B53, 231-240)
Lower Right: Inside of CHESS station F2 Hutch featuring
CCD and cryo gas unit. Courtesy MACCHESS, Cornell University.
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