Soldiers on the Cultural Front: Developments in the Early History of North Korean Literature and Literary Policy. By Tatiana Gabroussenko. Honolulu: University of Hawai'i Press, 2010. 248 pp. $49.00 (cloth).

2011 ◽  
Vol 70 (3) ◽  
pp. 854-856
Author(s):  
Heonik Kwon
Keyword(s):  
Early History ◽  
Korean Literature ◽  
History Of ◽  
University Of Hawai'i

Some early history of replica techniques for electron microscopy

1992 ◽  
Vol 50 (2) ◽  
pp. 1076-1077
Author(s):  
Robert M. Fisher
Keyword(s):  
Thin Film ◽  
Electron Microscopy ◽  
Optical Microscope ◽  
Early History ◽  
Bulk Materials ◽  
Thin Sections ◽  
Transmission Electron ◽  
Reflected Light ◽  
History Of ◽  
Electron Microscopes

By 1940, a half dozen or so commercial or home-built transmission electron microscopes were in use for studies of the ultrastructure of matter. These operated at 30-60 kV and most pioneering microscopists were preoccupied with their search for electron transparent substrates to support dispersions of particulates or bacteria for TEM examination and did not contemplate studies of bulk materials. Metallurgist H. Mahl and other physical scientists, accustomed to examining etched, deformed or machined specimens by reflected light in the optical microscope, were also highly motivated to capitalize on the superior resolution of the electron microscope. Mahl originated several methods of preparing thin oxide or lacquer impressions of surfaces that were transparent in his 50 kV TEM. The utility of replication was recognized immediately and many variations on the theme, including two-step negative-positive replicas, soon appeared. Intense development of replica techniques slowed after 1955 but important advances still occur. The availability of 100 kV instruments, advent of thin film methods for metals and ceramics and microtoming of thin sections for biological specimens largely eliminated any need to resort to replicas.

The early history of tuberous sclerosis

1979 ◽  
Vol 115 (11) ◽  
pp. 1317-1319 ◽  
Author(s):  
J. E. Morgan
Keyword(s):  
Tuberous Sclerosis ◽  
Early History ◽  
History Of

New Light on the Early History of the Greater Northwest

2015 ◽  
Author(s):  
Alexander Henry ◽  
David Thompson
Keyword(s):  
Early History ◽  
History Of
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