We present a patient with chronic stenosis of the larynx due to attempted suicide by hanging. A 32-year-old male with schizophrenia attempted to hang himself. He consulted our hospital with a complaint of difficulty in swallowing. Fiberscopic examination and CT findings revealed blunt damage between the hyoid bone and thyroid cartilage.
Resection of scar was done to maintain a sufficient lumen. After surgery, his swallowing improved.
It would be better to evaluate the larynx as soon as possible when examining a patient with neck

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A preliminary experiment was carried out to concentrate minor element in sea water. An artificial sea water containing 0.5 M sodium chloride, 0.05 M magnesium chloride and 70 ppb of iron was prepared.Two liters of the artificial sea water was put in contact with 500 ml of isobutylalcohol. A stainless steel plate (18/8) with a diameter 14 cm was placed in the alcohol phase at one centimeter above the interface as the cathode and a platinum wire in the aqueous phase as the anode. The electrolysis was performed for four hours at 80 mA. Iron was quantitatively coprecipitated with magnesium hydroxide formed at the interface by the electrolysis. The precipitation contained 0.14 mg of iron and 31 mg of magnesium. On the other hand, 1800 mg of magnesium has to be precipitated by ammonia water to collect 0.14 mg of iron in the solution with a common coprecipitation method. In the present case, the adsorption of iron to the alcohol-water interface may have taken place and the coprecipitation occurs at the interface.

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Multielement analysis of individual air-borne particulates is nesessary for air-pollution research (e. g., search for their origins). Particles are collected on a Mylar film by a cascade impactor at a flow-rate of 9 liter per minute for 1 hour. The Mylar film is supported on a hollow tube after drying. A particle suitable for analysis is selected microscopically, evaporated by a laser beam emitted from neodymium glass, and excited by a high voltage spark discharge (100 μH, 6 μF, 1 Ω, and 2.5 kV). Magnesium, aluminium, silicon, calcium, iron, copper, and zinc are detected in particles of 4, 6, 8, and 10 μm diam. The content of light elements seems to be greater than that of heavy elements. The amount of each element increases with increasing particle size. The chemical composition of each particle differs in spite of the same diameter, and the variation of spectral line intensity of heavy elements seems to be slightly larger than that of light elements.

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γ-リン酸ジルコニウム (γ-ZrP) を0.1mol・dm^-3亜リン酸中で還流することによって, γ-亜リン酸リン酸ジルコニウム (γ-ZrPP) をAlbertiらの方法で合成した。これをホストとして, 9種のn-アルキルアミン (C₃3～C₁₄) をゲスト分子に選び, 25℃でγ-ZrPPにインターカレートした。層間化合物の層間距離 (d) を各アミン分子中の炭素原子数 (N_c) に対してプロットすると, d=1.32N_c+12.2 () で示される直線を与えた。ゲストのアミンは単分子層で取り込まれ, 各分子はγ-ZrPPの層平面に対しほとんど垂直に配列することが示された。

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For the determination of trace metal impurities in acids, an evaporator was specially designed so as to avoid contamination from atomospheric environment in concentrating procedure.
The analytical procedure established is as follows. Take (100200) ml of acid sample in a quartz or Teflon beaker which is set in the evaporator (Fig. 1). Heat gently and evaporate the solution to almost dryness. After cooling, dissolve the residue in 1 ml of 3 N hydrochloric acid and dilute to 10 ml with water. Then the solution is introduced into a premix type slot burner.
Measurements were made with a Hitachi model 308 atomic absorption spectrophotometer, using airacetylene flame. The proposed method is applicable to the determination of metal impurities of ppb order in acids.

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A curie point thermobalance was newly developed, by applying the curie point pyrolysis techniques of the pyrolysis gas chromatography to the field of the thermal analysis. A thin walled cylindrical heating element (ferromagnetic materials) which holds a sample pan in it is placed on a micro-thermobalance. The element is self-heated instantly up to its curie point temperature by induction, when high frequency power is supplied to the heating coil. After heating, it is held in isothermal state at the point, exactly. It is a benefit of this curie point thermobalance that there is no need to measure and control the sample temperature because the heating element contains only minute sample.
Details of the construction, features and some applications of the curie point thermobalance are thus presented.

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Absorption spectrum of sodium chloride in an airacetylene flame has been measured in the ultra-violet and visible regions. A Shimadzu AA 650 atomic absorption spectrophotometer was used in connection with a Shimadzu-Yasec Spectral Band Analyzer, which is a data treatment system with magnetic tapes. Although the atomic absorption spectrophotometer is of a double beam type equipped with a deuterium lamp, the absorption spectra measured with this spectrophotometer is non-linear and contains the background due to the aspirated solvent and/or the components of the flame. The spectral band analyzer was used for the correction of the baseline and the background absorptions.

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In this report, a method for chelometric determination of lead(II) in a standard solution of lead tetraacetate is investigated. The difference between the total amount of lead(II) measured by the chelometric determination after the reduction of lead(IV) with sodium oxalate, and the amount of lead(IV) measured separately by the potentiometric determination with sodium oxalate standard solution, is used for the determination.
The procedure of this method is as follows:
Into a 300 ml tallbeaker containing 50 ml of 0.05 M lead tetraacetate standard solution, 0.1 N sodium oxalate standard solution is added until its amount reaches(12)% excess to reduce lead(IV) to lead(II). This solution, after evaporated almost to dryness on a water bath, is treated with 5 ml of conc. HNO₃ and again evaporated to dryness. The white residue is dissolved in 2 ml of 1 N HNO₃ and diluted up to 250 ml. The resulted sample solution of lead(II) is titrated with a standard solution of EDTA at pH 5 using Xylenol Orange as an indicator. The concentration of lead(II) as an impurity is calculated from the difference between the total amount of lead(II) and the amount of lead(IV) measured by the potentiometric determination with sodium oxalate standard solution.
By this procedure, it was found that (1.41.7)% of lead(II) in mole fraction was contained as an impurity in a freshly prepared standard solution of lead tetraacetate. These results agree with the amount of lead(II) found by the polarographic method in the previous paper.
This method is simpler than that reported in the previous paper and is applicable over a wide range of impurity content of lead(II) in a standard solution of lead tetraacetate.

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Improvement of gas liquid chromatography of siali cacid is described. In the former method, the sialic acid was converted in to trimethylsilyl or trifluoroacetyl derivative. The latter had difficulties in the separation of anomeric isomers and the decomposition of the derivatives which were formed during the processes of gas chromatographic separation.
In this report, we could overcome these disadvantages by converting sialic acid to the corresponding ο-methyl sialic acid methylester by trifluoroacetylation with N-methylbistrifluoroacetoamide (MBTFAA). This method was applied to determine the trace amounts of carbohydrate in the alkaline phosphatase. Glucosamine, galactosamine, galactose, fucose and mannose were detected in the alkaline phosphatase, and it was confirmed that human liver alkaline phosphatase was identified as the sialoglycoprotein (The liver enzyme contained 16.5 molecules per one molecule).

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本研究は，日本化学会の化学教育への取り組みの歴史と未来に中等教育化学の基本概念を探った。その結果，「粒子」，「エネルギー」，「環境」，「GSC」などの概念の重要性が明らかになった。

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ウランの核分裂生成物をマルチトレーサーとして用い, 無定形および結晶性リン酸ジルコニウム, α-リン酸チタン, α-ヒ酸ジルコニウム, イオン交換樹脂などのイオン交換体への吸着挙動を調べた。その結果, 半定量的ではあるが, 多くの陽イオン性放射性核種の分布係数は, 無定形およびγ-リン酸ジルコニウムで高いことが判った。また, ジルコニウム, ニオブなどの特異な吸着挙動, リン酸チタンへのバリウムの高い選択性を観測した。γ-リン酸ジルコニウムのカラムを用いる核分裂生成物の属分離の予備的実験を試み, おおむね強酸性陽イオン交換樹脂を用いた場合と同様の結果を得た。核分裂生成物を用いるマルチトレーサー法は, 定量性に問題があるが, 同一条件下での多種イオンの吸着挙動を同時に, 迅速に知る有用な手段であると考えられる。

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筆者がこれまでに行ったイオン交換に関する研究の概要を年代順に記述する。放射化学ないし核化学研究におけるイオン交換樹脂の応用では, 1) 本邦最初のホットアトム化学の研究は, ヒ酸形強塩基性陰イオン交換樹脂を用いて行われた, 2) 核構造研究のためのβ線スペクトル測定のため, 無担体Ni-56線源を作製した。この過程でイオン交換クロマトグラフ法が有効に用いられた, 3) 陽子によるウランの核分裂の研究で, ビームモニターに銅を用い, イオン交換クロマトグラフ法で分離した。
無機イオン交換体の研究では, おもにリン酸ジルコニウムタイプの結晶性層状化合物を取り上げ, 1) 微小負荷条件でのイオン交換特性の研究, 2) マクロ負荷条件での交換体の相変化, アルカリ金属イオンなどの選択性, とくにα-リン酸ハフニウムのイオン交換特性, 3) 無機イオン交換体をホストとするホストーゲスト反応の研究, ホストの層空間における遷移金属イオンの錯生成の可能性, などについて述べる。

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平成6年4月から使われる高校の化学教科書には, これまでと違って, 18族方式の長周期周期表が登場する。従来の周期表では, 世界的にAB亜族の命名法に二つあって, 混乱のもととなっていた。新方式は国際純正応用化学連合(IUPAC)の推奨にもとづくものだが, これが唯一絶対の周期表の決定版というわけではない。電子配置と物質の性質は切り離せない関連を持つが, どんな問題点があるだろうか。この機会に周期表の効用や限界をもう一度見直すことも意味のあることではなかろうか。

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In order to reexamine the heats of dissolution of gypsum and anhydride, calorimetric measurement of the following reaction couples were carried out at 25°C; CaSO₄·2H₂O-H₂O or H-R, CaSO₄ (II) -H₂O or H-R, gypsum saturate solution H-R and Ca-R₂-H₂SO₄ in which H-R and Ca-R₂ denote a strongly acidic ion exchange resin, hydrogen form and resin in Ca form, respectively. As shown in Fig. 3, there are distinct differences between this paper and published data as shown in Perry's handbook, viz.,
1) Heat of dissolution of gypsum in water was measured as 9.7kJ/mol (endothermal), the amount of which is greater than the handbook (0.7₅kJ/mol).
2) Difference between two data was also observed in heat of dissolution of anhydride in water such as 8.4 and 21.3₄kJ/mol.
3) Hydration heat of anhydride to gypsum was measured as 15.6kJ/mol comparable to the handbook (16.9kJ/mol).

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The author has found a case of positive direct Coombs' test on the blood of the hushand cooled to room temperature by investigating the each blood of parents whose new-born had died under melena-like symptomes. Then the author found that in almost all kin members of the husband (except one of his elder sister) positive reactions by direct Coombs' test were demonstrated and these positive reactions were observed under cold condition at room temperature (15°〜20℃) owing to sensitization of red blood cells. On the other hand, by means of the other serological examinations there was not a man or woman of any evident blood disease except slight anaemia in members of the blood-relation(Miyoshi-ke)of the husband. But the author considers that this positive direct Coombs' test might be related with congelation urticaria of the husband even if the author did not find general relation with special disease to these positive reactions. Before long the author found these self-binding incomplete cold haemagglutinins which caused the positive direct Coombs' tests were belonging in non-γ-globulin fractions (almost in α_2-globulin fraction) by means of serological and electrophoretic examinations. Then the author considers this haemaggglutinis are belonged to one special kind gf incomplete cold agglutinis (Dacie called) which sensitizes to red blood cells even under warmer condition of room temperture. As there is such self-binding incomplete cold haemagglutinin which has not direct relation to evident disease, the author thinks, the examiner must investigate circumspectively in direct Coombs' test and must not apt to neglect scrutiny of the result.

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鑑識化学分析は,別名,裁判化学ともいわれるように司法裁判に関係ある事件の解決に応用される分析化学である.したがって,分析対象となる物質は広範囲にわたるため,その分析内容は,しばしば,必然的に薬品分析,農薬分析,生化学分析,機器分析などの各種分析に関連してくるので,用に臨んで,それらの総説や報告を参照することが必要である.今回は1965年までの文献を収載した前回の総説に続いて1966～1968年の間に報告された鑑識化学分析関係の文献を集め整理した.
裁判化学の教科書が改訂されたが,それには新しい分析法が記載されているので研究者にとっても便利である.スポットテストの裁判化学への応用が解説され,また,薄層クロマトグラフ分析(TLC) やガスクロマトグラフ分析(GC)の鑑識化学分析への応用を述べた総説も発表されている.中毒学の分野におけるGCを記載した単行本が発刊され,また,裁判化学領域における放射化分析(AA)の単行本も出版されている.原子吸光分析や,フレーム分析やAAの鑑識化学分析への応用とその有用性を強調した総説や解説もある.AAを含めた各種機器分析の鑑識化学分析への応用を述べた解説があり,また,臨床化学に関係のある毒物分析の総説も参考になるものと思われる.

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