びわ湖産仔稚アユ個体群の体重-体長関係の統計量および標準体長/全長比を基礎資料として, 体重-全長関係と体重-体長関係の互換の統計的方法を導き, かっその方法によって, 湖産仔稚アユの体重-全長直線および体重-体長直線を次のようにとりまとめた。
w=-3.48282+3.813551
w=-3.72104+3.813551'
(ただし, w: 体重mg, 1: 体長mm, 1': 全長mm)

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A parasitic body, i. e. the fist-sized trunk with the arms and legs was attached to the epigastric region of a male newborn at full-term birth. The parasite showed spontaneous urination and movement of the extremities, and was detached successfully. The autosite died of cyanosis and dyspnea 7 days after birth. The autosite weighed 2,800g. No external anomalies except for the parasitic body were present. Cardiac anomalies including ventricular septal defect, overriding of the aorta and patency of the foramen ovale were detected. Besides, acute bronchopneumonia and congestion of the liver, kidney and spleen occurred. An artery arising from the right subclavian artery entered into the parasite in the region of the xiphoid process after running down behind the sternum. The blood circulating through the parasite flowed back into the left atrium of the autosite. The parasite weighed 400g. The upper and lower extremities were almost well-developed on both sides. No anomalies of the hands and feet were found. The head, thorax, upper abdomen and vertebral column were defective. In the abdominal cavity there were blind-end isolated small and large intestines with the appendix. No rectum and anus were formed. The uro-genital organs consisting of one fused kidney with the adrenal glands, urinary bladder, two ureters, prostate, penis and two testicles in the scrotum were also found. No anomalous genitals were seen. On x-ray examination, the autosite revealed almost complete formation of the skeleton. In the parasite the bones of the upper and lower extremities and pelvis were clearly shown, but the cranium, vertebrae, sternum and ribs were not indicated. It was pointed out that in the autosite cardiac anomalies were found, and that in the parasite the uro-genital organs as well as the lower portion of the skeleton were relatively well-developed.

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The purpose .of the study is to establish the evaluating method of the fracture of framed floors and walls under dynamic loads affected by human. In this paper, part 2, the apparatus for evaluating the fracture of framed floors and walls was newly designed and manufactured. The apparatus is composed of three parts, namely, mechanical loading system, fracture detector, and base of these, which are based on the properties of dynamic loads affected by human, investigated in part 1. Moreover, the method of detecting the fracture of framed floors and walls under dynamic loads was presented through the experiment using newly developed apparatus for evaluating the fracture.

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The purpose of this study is to establish the evaluation method of the fracture of framed floors under dynamic loads affected by physical bodies. First, we elaborated the gist of the evaluation method of the fracture of framed floors.Second, the apparatus for evaluating the fracture of framed floors was newly designed and manufactured. Based on properties of dynamic loads affected by physical bodies, the apparatus is composed of mechanical loading system investigated in part 1 and a dial gauge for measuring framed floor bending. Third, we investigated the relation between mass and velocity is interchangeable on the experimental basis. As a result, in this paper part 2, we presented the evaluation method of the fracture of framed floors under dynamic loads affected by physical bodies using mechanical loading system.

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The purpose of the study is to establish the evaluation method of the fracture of framed floors and walls under dynamic loads affected by human. In this paper, part 3, based on properties of dynamic loads affected by human and the basic mechanics of the apparatus investigated in part 1 and part 2, the apparatus for evaluating the fracture was newly developed. Then the evaluation method of the fracture was presented using the magnitude of loads when the fracture was detected under the load affected by the new apparatus.

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誘導結合プラズマ質量分析器をイオン源として、イオントラップ中に導入したイオンをレーザー冷却し、その蛍光を観測することでイオンの挙動を推測することが可能となる。この際、冷却されないイオン（同重体）が含まれる場合は、熱源としての効果を持つ。単純にはレート方程式で評価できると考えられるが、詳細な検討が必要である。そこで、本研究では、その同重体が及ぼす影響を実験的に評価する。

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A case of asymmetric conjoined twins (Epigastrius) was successfully operated. The autosite had omphalocele. The parasite was attached to the xiphoid region, shared the abdominal cavity with the autosite, and had well developed lower lims, pelvis, kidney, bladder, ovaries, and intestine. At operation, it is important to remove all the tissues or organs belonging to the parasite.

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A female infant weighing 3,800g was born at 41 weeks of gestation in a satisfactory cource to a healthy 23-year-old primipara. The infant had a parasite conjoined with her sacrococcygeal region. The autosite had no other anomalies. The asymmetrical conjoined twins were easily separated by operation 36 hours after birth. The parasite was 730g in weight. It had a femur, a tibia, a fibula, seven phalanger and hypoplastic pelvis. Vertebral structures were not present. There was no connection of viscerae between the parasite and the autosite. It had well develoed intestines, multilocular cyst, unilocular cyst, and lower limb. Histlogically, the wall of multilocular cyst consists of tissues of three germ layers that has differentiated to the various degrees. It was diagnosed, there-fore, as the Sacral Parasite. After the operation, her growth and development are favorable. Reviewing the Japanese literatures, the authors could find only 2 cases of sacrococcygeal parasite. The pathogenesis and diagnotic criteria of this anomaly were discussed.

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二重体はまれな先天異常で, 非対称性結合二重体であるEpigastrius(上腹体)はさらにまれとされる.我々は, 上腹部正中より臀部を伴った下肢様構造の突出を認め上腹体と診断した症例を経験した.自生体には臍帯ヘルニアとFallot四徴症, 小眼球症を合併し, 寄生体切除術後, Blalock-Taussig手術を施行した.寄生体は自生体と臓器で連続しておらず, 腹腔を別にしていた.切除した寄生体には, 病理組織学的に神経節細胞を有する小腸・大腸, 腎, 尿管, 膀胱, 精巣, 精巣上体, 陰茎, 骨盤, 下肢構造が認められた.上腹体は胎生早期の多潜能性の胎生幹細胞が異所性に発育して生じると考えられることから, 寄生体腸管に見られた神経節細胞は胎生早期に寄生体に分布した原基から分化したと考えられた.

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分子内に二つ以上存在度の低い同位体を持つ二重置換同位体分子が近年注目されている。本研究では安定同位体を一つしか持たないフッ素を利用し、対象元素以外をフッ素に置換(例：C₂H₆→C₂F₆)することにより同重体問題を解決し、従来の質量分析計(MAT253)での二重置換同位体分子計測を可能にした。二重置換同位体分子は従来の同位体分析(¹³C/¹²C等)では得られない、豊富な情報を保持し、また開発する同位体分子計測は、堆積性有機物や大気海洋中の多種多様な有機分子に対して適用可能性がある。本研究は、エタン、エタノールのフッ化型同位体分子計測を開発し、¹³C-¹³C二重置換同位体分子種の分析により、それら分子の起源判別に利用できる可能性を明らかにした。

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