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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 …
Molecular And Physiological Responses Of Diatoms To Variable Levels Of Irradiance And Nitrogen Availability: Growth Of Skeletonema Costatum In Simulated Upwelling Conditions, G. Jason Smith, Richard C. Zimmerman, Randall S. Alberte
Molecular And Physiological Responses Of Diatoms To Variable Levels Of Irradiance And Nitrogen Availability: Growth Of Skeletonema Costatum In Simulated Upwelling Conditions, G. Jason Smith, Richard C. Zimmerman, Randall S. Alberte
OES Faculty Publications
Molecular mechanisms that drive metabolic acclimation to environmental shifts have been poorly characterized in phytoplankton. In this laboratory study. the response of light- and N-limited Skeletonema costatum cells to an increase in light and NO3 availability was examined. C assimilation was depressed relative to N assimilation early in enrichment, and the photosynthetic quotient (O2: CO2) increased, consistent with the shunting of reducing equivalents from CO2 fixation to NO3- reduction. The concomitant increase in dark respiration was consistent with the increased energetic demand associated with macromolecular synthesis. The accelerations of N-specific rates of …