Showing papers by "Korea University published in 1974"

Pyrantel embonate in mass treatment of ascariasis and comparison with piperazine adipate and santonin-kainic acid complex.

Abstract: A single dose (2.0, 5.0, 10.0 mg/kg) of pyrantel embonate given to three groups consisting 301 children with Ascaris lumbricoides infection achieved a cure rate of 91.3%, 94.4% and 98.9% respectively. Whereas in the other two groups of 71 and 75 patients who received 75 mg/kg body weight with piperazine adipate 2 or 3 consecutive days, the cure rates were 62.0% and 74.7% respectively. Administration of a single recommended dose of santonin-kainic acid complex given to 77 patients achived a cure rate of 80.5% with 91.0% of egg reduction rate. The cure rate resulting from a single lowest dose 2.5 mg/kg pyrantel embonate was significantly higher than those of piperazine adipate and santonin-kainic acid complex in the mass treatment for ascariasis. in addition to the group of 2.5 mg/kg pyrantel embonate treatment, the side effect was lesser than those of the other groups. Considering the efficacy and safety of pyrantel embonate against Ascaris lumbricoides, it would be one of the useful agents for the mass treatment of Ascaris control.

Cyclotron resonance in mercury: Temperature dependence and the electron-phonon interaction

Abstract: The temperature dependence of the effective cyclotron mass and the electronic relaxation time in mercury have been investigated by Azbel'-Kaner cyclotron resonance using a microwave frequency of 35 GHz. The measurements cover the temperature range 1.15 to 2.5 K in 0.05-K intervals. Two orbits are studied with the magnetic field in the binary-bisectrix crystallographic plane of the sample surface. For both orbits, the cyclotron mass ${m}^{*}$ is found to increase as the temperature squared, in good agreement with the prediction of the theory of the electron-phonon interaction. The relative mass increments at 2.5 K with respect to 0 K are 4.2% for one orbit and 3.6% for another. These different values indicate that the effect is dependent upon the cyclotron orbits, and are discussed in terms of a directional phonon spectrum. The experimental relaxation rate varies more rapidly than the cube of the temperature. The variation is found to be proportional to ${T}^{5.2\ifmmode\pm\else\textpm\fi{}0.3}$, which confirms previous experimental results, and indicates that the low-energy portion of the ${\ensuremath{\alpha}}^{2}(\ensuremath{\omega})F(\ensuremath{\omega})$ spectrum is nonquadratic.