A tendency for exons to correspond to discrete units of protein structure in protein-coding genes of ancient origin would provide clear evidence in favor of the exon theory of genes, which proposes that split genes arose not by insertion of introns into unsplit genes, but from combinations of primordial mini-genes (exons) separated by spacers (introns).… (More)
The complete sequence of the bacterium Thermotoga maritima genome has revealed a large fraction of genes most closely related to those of archaeal species. This adds to the accumulating evidence that lateral gene transfer is a potent evolutionary force in prokaryotes, though questions of its magnitude remain.
The 5 January 1972 announcement by President Richard Nixon that the United States would develop during the 1970's a new space transportation system-the space shuttle-has had fundamental impacts on the character of U.S. space activities. In retrospect, it can be argued that the shuttle design chosen was destined to fail to meet many of the policy objectives… (More)
This article examines the nature and extent of similarities and differences in cultural values among managers in the three nations that signed the North American Free Trade Agreement (NAFTA). One component of a culture is ethics, with this aspect of a culture existing as a potentially strong influence on the success of business organizations. In order to… (More)
The relations between Japan and the United States in space form a microcosm of the complex, multidimensional interactions between these two powerful societies. Cooperation and competition exist side by side, and the future balance between them is uncertain. The United States needs to develop a strategy with respect to future U.S.-Japanese space relations… (More)
In the past 25 years, the National Aeronautics and Space Administration has engaged in a range of cooperative activities in space with other countries and international organizations, most of the scientific interactions being with Europe. The character of U.S.-European cooperation in space science is changing as a result of the increased maturity and level… (More)