オオツチワン ノ エゾノネジモク コタイグン ニ オケル グンラク コウゾウ ノ ドウタイ

The population dynamics of Sargassum yezoense (Yamada) Yoshida et T. Konno, occurring at the 3 m depth at the mouth of Otsuchi Bay in Iwate Prefecture, were examined throughout a year. The average length of main branch reached the maximum in June and thereafter decreased to the minimum in October. On the other hand, the main branch density, leaves area and standing crop of the Sargassum community increased steeply from June to August ; during the other period these values were almost constant at a relatively low level. The annual net production of the community was estimated as 0.996 kg (d.wt.)/m^2 from the difference between the maximum value and the constant value of standing crop

ダイ ４３ カイ ニホン コウシュウ エイセイ ガッカイ ソウカイ ガクヤ バナシ

座談

Load frequency control considering distributed generator used Demand Estimation and GA.

This paper examined the load frequency control method in the power system that introduced ditributed generator. Examined content is the case of the distributed generator participated/nonparticipated in the frequency control of the system. Control of the power plant in each area is the case of the control method using the load demand estimation and GA, or TBC. To study the effectiveness of the distributed generator, this paper considered the computer simulation 3-area load frequency control model system which introduced the distributed generator

歯科用コーンビームCTにて診断し得た上顎洞内遊離骨片の1例

上顎洞内遊離骨片は無症状に経過するため，レントゲン撮影もしくは上顎洞内手術で偶然発見される場合がほとんどである．今回われわれは右側鼻翼部の違和感を主訴に来院した患者に対し，パノラマX線および歯科用コーンビームCT撮影を行い右側上顎洞内遊離骨片と診断し得た症例を認めたので報告する．症例は25歳の女性．右側鼻翼部の違和感を主訴に来院した．パノラマX線写真より右側上顎洞内に不透過性病変を認め，歯科用小型X線CTを撮影したところ，孤立性の骨様組織を2片認めた．右側上顎洞内遊離骨片と診断し，全身麻酔下にて摘出術を行った．病理組織学的にも遊離骨片に矛盾しない結果であった．術後は右側鼻翼基部に認められた違和感も消失し，経過良好である

A case that has been diagnosed with glandular odontogenic cyst by histopathological examination

Glandular odontogenic cyst (GOC) is a rare odontogenic cyst, classified as a developmental odontogenic cyst by the WHO histological typing of odontogenic tumours in 1992. GOC generally occurs in the mandible and arises in each age. The clinical differential diagnosis of odontogenic tumor and cyst is important however, it is difficult to discriminate between them in clinical and radiographical findings. Thus, pathological searches become an essential step for the definite diagnosis. We report a case of GOC, that primary diagnosis was dentigerous cyst by biopsy, but the definite diagnosis was GOC after total extirpation of cyst. Because of a high recurrence rate of GOC, the patients should be followed for a long term