Variable Arrangements Research Articles

キンギョの鰓後腺組織の周年変化

Histological investigations were made on the ultimobranchial glands of 107 individuals of goldfish collected at different months of the year and the following results were obtained. Histological structure of the glands was variable, showing lobular, follicular or cord-like arrangements of the ultimobranchial cells. No secretory granules were detected in the cells. Nerve cells were observed in or around the glandular tissue. In the immature goldfish collected in August, October and December, the ultimobranchial glands were small in size, being com-posed of cell cords. On the contrary, the matured fish collected in the spawning season showed hyperplasia of the ultimobranchial tissue, definite formation of lobules and hypertrophy of the cells. Thus, in correlation with gonadal maturation, remarkable seasonal changes were detected in the histological structure of the ultimobranchial gland of goldfish.

Designing a Television Theater

Design considerations for a versatile and efficient modern television theater include special attention to audience seating and technical control. Major design areas discussed are (1) the architectural considerations for mechanized seating and variable audience arrangements and (2) electronic and human engineering problems involved in developing a facility of this kind.

Invited Paper-Ion Injection from External Sources

Discussion is restricted to low and medium energy cyclotrons. Some reasons for using external injection are given. At the present time injection is either in the median plane or axial. Among the possibilities for injection in the median plane are cycloidal motion along a sector edge, linear motion by electrostatic compensation, and high energy injection with trapping into cyclotron orbits by change of charge. In the axial direction all methods have much in common--focussing down a hole in the magnet pole and inflection into a cyclotron orbit. As an example of the problems and possibilities with external injection the axial method is discussed in more detail. Topics include basic principles, beam quality, variable energy arrangements, bunching and the choice of injection energy.