Defense Against Bomber Attack
Among the weapons not covered by the strategic-arms-limitation agreements are antiaircraft systems. The Department of Defense has now proposed that the nation's air defenses be modernized
Volume 229, Issue 2
You are currently logged out. Please sign in to download the issue PDF.
Features
The Isolation of Genes
Given a specific RNA product of a gene, it is now possible to find and purify the stretch of DNA that encoded the RNA. The first genes to have been isolated are those that make the RNA's in ribosomes
Experiments with Neutrino Beams
The neutrino was first detected 17 years ago. Accelerators are now producing copious beams of these particles to probe the structure of other particles and the forces between them
Metal-Oxide-Semiconductor Technology
The MOS fabrication technique can put more than 10,000 electronic components on a silicon "chip" only a few millimeters across. Its economic impact can be seen in such devices as pocket calculators
The Evolution of the Andes
The geology of the central Andes indicates that the history of the range can be understood in terms of the consumption of a plate of the earth's crust plunging under South America
Duet-Singing Birds
The male and female of certain tropical species join each other in remarkably precise song. The primary function of this behavior is to maintain close communication between the birds in dense foliage
The Stirling Engine
This external-colubustion engine contributes little or nothing to air pollution and is exceptionally quiet. Its virtues make it a possible alternative to the internal-combustion engine
Hereditary Fat-Metabolism Diseases
New tests for detecting adult earners and for prenatal genetic diagnosis make it possible to control the incidence of 10 usually fatal lipid-storage diseases caused by inherited enzyme deficiencies