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The interpretation of transient tracer observations depends on dif • cult to obtain information on the evolution in time of the tracer boundary conditions and interior distributions. Recent studies have attempted to circumvent this problem by making use of a derived quantity, age, based on the simultaneous distribution of two complementary tracers, such as(More)
Milling and micronization of particles are routinely employed in the pharmaceutical industry to obtain small particles with desired particle size characteristics. The aim of this study is to demonstrate that particle shape is an important factor affecting the fracture mechanism in milling. Needle-shaped crystals of the β polymorph of D-mannitol were(More)
We have developed a protocol for rapid sequencing of short DNA stretches (15-20 nt) using MALDI-TOF-MS. The protocol is based on the Sanger concept with the modification that double-stranded template DNA is used and all four sequencing reactions are performed in one reaction vial. The sequencing products are separated and detected by MALDI-TOF-MS and the(More)
Printed leaky-wave antennas offer the potential for a low-profile, wide-bandwidth antenna element that can be arrayed if desired. Microstrip leaky-wave antennas rely on the suppression of the familiar EH/sub 0/ mode and the propagation of the radiating EH/sub 1/ mode. It is well-known that above a critical frequency, this leaky-wave will propagate with(More)
Work in the Microwave Spectroscopy Laboratory may be characterized as both pure and applied paramagnetics. We have been interested in the properties of paramagnetic materials, gases, liquids, and solids, and in the application of paramagnetic materials in quantum-mechanical or paramagnetic amplifiers. In general, the work involves an understanding of, and(More)
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