A scalable architecture for quantum computation with molecular nanomagnets.

A proposal for a magnetic quantum processor that consists of individual molecular spins coupled to superconducting coplanar resonators and transmission lines is carefully examined. We derive a simple magnetic quantum electrodynamics Hamiltonian to describe the underlying physics. It is shown that these hybrid devices can perform arbitrary operations on each spin qubit and induce tunable interactions between any pair of them. The combination of these two operations ensures that the processor can perform universal quantum computations. The feasibility of this proposal is critically discussed using the results of realistic calculations, based on parameters of existing devices and molecular qubits. These results show that the proposal is feasible, provided that molecules with sufficiently long coherence times can be developed and accurately integrated into specific areas of the device. This architecture has an enormous potential for scaling up quantum computation thanks to the microscopic nature of the individual constituents, the molecules, and the possibility of using their internal spin degrees of freedom.

Angina pectoris: effects of lidoflazine on exercise tolerance and chest pain.

In a double-blind study involving 24 patients, treatment with lidoflazine in comparison with placebo was associated with a significant improvement in exercise tolerance; the median increase in work performed was 62 percent. This increase was significant at the 6th week of assessment. Ten patients were followed up for a further 2 years. Lidoflazine therapy was associated with a significant improvement in work done over that period. Lidoflazine was well tolerated and apparent adverse effects were minor.

The devil and mass media...a local perspective.

PIP: In the past the Planned Parenthood Association of Columbus, Ohio, has used the mass media in a comprehensive but limited way to communicate the benefits and practice of family planning. The hope for sufficient funds to develop and implement an intensive advertising program for television, radio, and newspapers materialized when Planned Parenthood was asked to participate along with 3 other cities in a Health, Education and Welfare sponsored national study to determine the effectiveness of mass media in the promotion of contraceptive use. 2 sets of advertising materials for television, radio, and printed madia would be used; 1 from a national advertising firm and the other from the materials unit of the North Carolina Population Center. The advertising campaign would last 6 months and allow for over $100,000 in media time and space. 1 set of material consisted of a series of messages in which the main characters were storks who were obliged to deliver babies whether they were wanted or not. The other discussed contraception and one's ability to plan a pregnancy effectively. The campaign was completed in 1971. The results indicate that there was no apparent increase in the use of contraceptives from private or public sources for which the campaign could be considered responsible, although the campaign successfully created a significant awareness of the advertising spots. A means of positively influencing the public to have only wanted pregnancies is yet to be found.^ieng

DNA polymerase activities associated with smooth membranes and ribosomes from rat liver and hepatoma cytoplasm.

Deoxyribonucleic acid polymerase activity that prefers denatured DNA primer concentrates with the smooth membranes during sucrose gradient centrifugation of rat liver and hepatoma cytoplasmic extracts. The activity in this fraction is eightfold higher in hepatoma tissue. Deoxyribonucleic acid polymerase activity that prefers native DNA primer concentrates with the free ribosome fraction from both tissues.