Arytenoid dislocation

Arytenoid dislocation is a common yet infrequently diagnosed complication of laryngeal trauma. It may result in various symptoms, including permanent dysphonia, although immediate voice change is not always present. Early reduction is the treatment of choice; however, late reduction is often successful in restoring voice. A high index of suspicion based on the history of the patient is necessary to recognize arytenoid dislocation. Thorough physical examination and objective tests are helpful in confirming this diagnosis.     

Dynamics of bi-periodic structures

Many structures considered for space applications are bi-periodic in their construction. Bi-periodicity means that two types of structural subassemblies, alternating in one or more directions, make up the structure. To gain insight into the dynamics of bi-periodic space structures a variety of one and two dimensional bi-periodic structures are considered. Results indicate that bands in which natural frequencies lie for periodic structures are further subdivided as a consequence of the bi-periodicity. Analytical solutions for the modes and frequencies of finite length one dimensional bi-periodic structures are obtained for general boundary conditions. A transmission method is developed to simplify the application of boundary conditions. It is found that some modes occur at frequencies which are outside the frequency bands predicted for bi-periodic structures. Two dimensional bi-periodic crossed beam grillage and truss structures are considered in this study. For cases where a separation of variables solution is possible the two dimensional structures exhibit similar properties to the one dimensional bi-periodic structures. Analytical solutions for the one and two dimensional bi-periodic structures considered above lead to a compact solution form similar to that of periodic structures analysis.     

A study of the reaction p+d → 3He+π0 in the resonance region

The reaction $\text{p}\text{+}\text{d}\text{→}{}^3\text{He}\text{+ π}{}^0$ was studied at incident proton energies of 377, 462 and 576 MeV. A comparison of our data with others suggests the existence of a sharp forward peak in θ_He at 377 and 462 MeV, which is unexplained by the theory and disappears at higher energies.     

Stereoselective synthesis of four stereoisomers of beta-methoxytyrosine, a component of callipeltin A

Callipeltin A is a novel cyclic depsipeptide that selectively inhibits the cardiac sodium/calcium exchanger and is therefore of interest as a regulator of myocardial contractility. The stereochemistry of beta-methoxytyrosine, one of the amino acids contained within the marine natural product, could not be determined. In an effort to elucidate the stereochemistry of this moiety, a stereoselective synthesis of four stereoisomers of beta-methoxytyrosine from (S)- and (R)-serine was accomplished.