形成外科の領域におけるシミュレーション外科,コンピュータ支援外科に関する研究を,実際の臨床例を含めて,概説する。コンピュータを利用して手術を再現する方法には,コンピュータ・グラフィックス(CG)によるもの,3次元実体モデルによるもの,バーチャル・リアリティ(VR)によるものの三つの手法がある。CGによるものは,繰返しが容易であること,3次元実体モデルによるものは,実際の奥行き感を有することが利点となる。VRによるものは,その両者の利点を有するものとして期待されている。コンピュータを使用して手術をシミュレーションすることにより,正確な術前診断,手術法の検討,術後の評価が可能となる。それにより,手術侵襲の低減化,手術時間の短縮,入院期間の短縮が可能である。また,患者,家族への疾患,手術法の説明,学生,研修医の教育においても有用である。この研究は,現在,研究の始まったばかりの段階ではあるが,今後は,さらに大きく実を結んでいくものと考えられる。

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The fibrous composite adsorbents consisting of hydrous titanium oxide and activated carbon were prepared with hydrophilic polyacrylonitrile system polymer as a binder under various conditions, and the adsorptive property of the fibrous composite adsorbents for uranium from seawater was examined.
The fibrous composite adsorbents which spun under high pressure (10 kg/cm²) was the finest having the largest pore volume. In addition, the amount of uranium adsorbed of the fibrous adsorbent was the largest. The rate of uranium adsorption by the fibrous adsorbent was the same as the rate of uranium adsorption by the powdery adsorbent. The excellent fibrous adsorbent adsorbed 0.23 mg U/g adsorbent for 10 d and 0.65 mg U/g adsorbent for 100 d.
The rate of uranium desorption from the fibrous adsorbent by alkali carbonate solution was large, and the uranium in the fibrous adsorbent desorbed 75% for 8 h and about 100% for 24h.

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Stereolithography is a new method of rapid prototyping that was simultaneously developed in the US and Japan. This technology is becoming popular and advancing rapidly. In 1991, our department began to investigate the clinical applications of stereolithography. Since then, a few clinical applicationshave been developed. In this report, we will describe the application of stereolithography technology in the field of plastic surgery and discuss the problems and future of this new technique.

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Seasonal occurrence of adults of four major sweet potato defoliators, Aedia leucomelas LINNÉ, Agrius convolvuli LINNÉ, Brachmia triannulella (HERRICH-SCHAFFER) and Spodoptera litura FABRICIUS, was examined from 1983 to 1985 at Kushira in Kagoshima. Adults of A. leucomelas were captured with light and molasses-traps from early May to mid-November. Peak catches occurred in mid-June-early July, mid-July, early August and September. Moth numbers increased gradually from the first peak to the highest peak in September. A. convolvuli was caught from late May to mid-October in a light-trap. Almost all of the total annual moth catches occurred in August and September. Moths of B. triannulella, which overwinter at the adult stage, were counted visually by the moth-flushing method (the surveyor walks along the nursery beds of sweet potato and brushes the plants with a rod) from late April to early November. Two major peaks occurred in May and June. The first peak was higher than the second in the last two years. Many moths of S. litura were captured with light and molasses-traps from August to November. The peak in number occurred from early to mid-September. The number of individuals captured with a pheromone trap (Pherodine SL ^R ) greatly exceeded that of the individuals captured with other traps. Moths were abundant in September and October. Population density of A. leucomelas and A. convolvuli in August seemed to be higher than that reported by MIYAHARA et al in 1963-66. This may be due to the change of the cultivation methods of sweet potato. Namely, adults of A. leucomelas, A. convolvuli, which emerged in early and late May, respectively, were able to lay their eggs on the leaves of sweet potato which had already been transplanted in late May according to recent cultivation methods. As a result, the moth populations of the following generation increased in the August period. Such a phenomenon was not observed in S. litura presumably due to the food habits of the larvae of this insect which is polyphagous.

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We have been making a study on the extraction of uranium from seawater with the composite adsorbent which consists of hydrous titanium oxide and activated carbon.
In this paper, the titanium-activated carbon flocculent adsorbents were prepared with PAH (polyacrylic acid hydrazide) as a binder, and the uranium adsorptivity of the flocculent adsorbents was examined in seawater. The flocculent adsorbents were found to show a high rate of adsorption for uranium similar to the powdery adsorbent and to adsorb 0.1 mg-U/g for 5 days from natural seawater

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