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Full-Text Articles in Life Sciences
Book Review, Bradley J. Olson
Book Review, Bradley J. Olson
RISK: Health, Safety & Environment (1990-2002)
Review of the following: THE CODE OF CODES: SCIENTIFIC AND SOCIAL ISSUES IN THE HUMAN GENOME PROJECT. (Daniel J. Kevles & Leroy Hood, eds., Harvard University Press 1992) [397 pp.] Contributors, figures, index, notes, preface, selected bibliography, tables. LC 91-38477, ISBN 0- 674-13645-4. [Cloth $29.95. 79 Garden Street, Cambridge MA 02138.]
The Stability Of Adsorbates Imaged With A Scanning Tunneling Microscope Using Hopping Versus Constant Current Scanning, Terje G. Vold
The Stability Of Adsorbates Imaged With A Scanning Tunneling Microscope Using Hopping Versus Constant Current Scanning, Terje G. Vold
Scanning Microscopy
We have studied the stability of various adsorbates, including gold, a platinum-iridium alloy, and DNA, on monoatomically flat gold imaged with a scanning tunneling microscope. We find that adsorbates are generally more stable, sometimes dramatically so, if imaged with a hopping trajectory of the tip rather than with the conventional constant-current scanning technique. Gold pits and associated debris formed on flat gold surfaces under saline solution by mechanical impact of the tip with the surface are always much more stable when imaged with hopping. Samples of thin, sub-monoatomic layers (0.1 nm and 0.2 nm thick) of a platinum-iridium alloy evaporated …