At low levels, enterohemorrhagic Escherichia coli should be selectively isolated by suppressing competing microflora in meat samples. In conventional methods, MacConkey II Agar with C-T Sorbitol (cefixime-tellurite, CT-SMAC) which utilizes the ability of

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. coli O157 to ferment sorbitol, and media containing -specific chromogenic substrates, are used for detecting

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. coli O157.
In this study, we compared two types of CHROMagar^TM O157 for the isolation of enterohemorrhagic

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. coli O157 (improved CHROMagar^TM O157 and conventional CHROMagar^TM O157) with CT-SMAC by using the Miles-Misra method and evaluating the recovers from ground beef and human fecal samples. The results obtained are described below:
1. In the inoculation test with three media by the Miles-Misra method, improved CHROMagar^TM O157 inhibited the growth of all organisms except

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. coli O157 better than the two other media and allowed easy differentiation from

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. hermannii, which could not be distinguished on CT-SMAC.
2. In the

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. coli O157 detection test for ground beef artificially inoculated with

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. coliO157 at 1 cfu/g, the detection rate of improved CHROMagar ^TM O157 was 95%, CTSMAC 75% and conventional CHROMagar^TM O157 40%, respectively.
4. In the

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. coli O157 detection test for

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. coli O157 positive human fecal samples, the detection rate of improved CHROMagar^TM O157 was 54.5%, CT-SMAC 50% and conventional CHROMagar^TM O157 .%, respectively.

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フィラー含有量の多い歯冠用硬質レジン(高フィラー型硬質レジン)の4製品, エステニア(EE, ED), アートグラス(, AD), ベルグラスHP(BE, ), グラディア(GE, GD)のそれぞれ2種類(エナメル用, デンチン用)について, それらの曲げ強さ, 曲げ弾性率, ヌープ硬さ, 吸水量および溶解量を測定した. 試験体の作製は, 製造者指示に従い, 測定結果はt-検定(危険率5%)で統計処理を行った. 曲げ強さは96.2〜210.6MPaを示し, エナメル用ではEE>BE>>GE, デンチン用では, ,ED>AD>GDの順に大きな値であった. 曲げ弾性率は6,〜24.6GPaを示し, エナメル用ではEE>, BE>GE, デンチン用では>ED>AD>GDの順に大きな値であった. ヌープ硬さは42.〜163.を示し, エナメル用ではEE>BE>, GE, デンチン用では>ED>AD, GDの順に大きな値であった. 吸水量は.〜28.1μg/mmを示し, エナメル用ではGE>, BE>EE, デンチン用ではGD>AD>>EDの順に大きな値であった. 溶解量は0.2〜0.6μg/mm^を示し, エナメル用およびデンチン用の両者で有意差は認められなかった. 以上の結果から, 高フィラー型硬質レジンは製品ごとの性質を理解した上で, 適切な症例や応用部位に用いるべきであることが示唆された.

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The present study examined transitive responding and a symbolic distance effect during a transitive inference task in rats. Seven three-step barriers (45 cm high in total) with different visual appearances and tactile features were used as discriminative stimuli. Four rats were trained to choose and climb over one of two barriers presented simultaneously to enter a goal box and get food rewards. If a rat climbed the wrong barrier the door connected to the goal box did not open. All four rats acquired concurrent discrimination learning of four tasks (A+B-, B+C-, C+D-, and D+-), and showed significant transitive responding to item B on the novel pair in a probe test. Moreover, two rats acquired concurrent discrimination learning of six tasks (X+A-, A+B-, B+C-, C+D-, D+-, and +F-), and one of them showed a symbolic distance effect, in other words a better performance for novel pairs composed of more distant items (.g., ) than pairs composed of closer items (.g., ) in the transitive series (X-A-B-C-D--F). The symbolic distance effect is regarded as evidence that animals solve transitive inference task based on non-deductive processes, because deductive reasoning predicts better performance to item pairs composed of closer items that call for fewer premises to be combined. Therefore, findings in the present study suggest that, as is the case with birds, monkeys, apes, and human beings, rats seemed to learn a transitive task based on some non deductive processes, such as formation of liner representation of items or value transfer between items.

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The mechanism of wave-induced instability in a permeable seabed have been studied for more than two decades. The distinction between shear failure and liquefaction, however, has not been clearly defined. This paper presents a fundamental study on the differences in two failure modes for a fully saturated seabed of both finite and infinite thickness. The wave-induced effective stresses and pore pressure, obtained from an analytical solution of Biot's pore-elastic consolidation theory, were employed to examine the failure modes under a two-dimensional plane strain condition. A case study is presented to examine the failure modes with respect to several parameters, such as excess pore pressure, seepage flow, seepage force, failure areas and stress path in the seabed. The conclusions obtained from this study were as follows ; (1) the thickness of a permeable seabed affects the pore pressure and effective stress response to ocean waves and the failure mode of the seabed, (2) either a liquefaction or shear failure, or both, occur in the seabed, even in the saturated seabed, () the Mohr-Coulomb's failure criterion, when combined with elastic stresses, can not be employed to estimate the liquefaction failure in the seabed, (4) the liquefaction can be evaluated by a criterion in terms of the excess pore pressure, (5) The liquefied zone in the seabed is significantly different from the shear failure zone. The shape beneath the seabed surface for the former is almost identical to the contour where the upward seepage flow is concentrated.

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Yttrium samples were levitated in an electrostatic levitator and their radiation intensities at their melting temperature were measured by spectrometers over a wide wavelength range. By comparing the measured intensities with those of a blackbody, spectral hemispherical emissivity values were calculated. The total hemispherical emissivity of yttrium at its melting temperature was calculated by integrating the spectral hemispherical emissivity and was found to be 0.32. The constant pressure heat capacity was also calculated using time-temperature data and was found to be 37. J·mol-1·K-1 at 1795 K.

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In the 1993 Kushiro-oki Earthquake of Richter magnitude ., simultaneous recording of earthquake motions was successfully made at the ground surface and at a depth of 77 meters in a dense saturated sand deposit. The peak horizontal acceleration was 0.47 g on the ground surface and 0.21 g at a depth of 77 meters. The acceleration record at the ground surface showed a distinctive ground response, which consisted of a cyclic motion having a period of about 1.5 seconds overlain by a spike at each peak of the motion. In order to study the mechanism of this peculiar ground response, effective stress analysis was conducted on the dense saturated sand deposit. The model used for this study was a strain space multiple mechanism model, which takes into account the effect of principal stress axis rotation. The recorded earthquake motion at a depth of 77 meters was used as the input earthquake motion for the analysis. Sampling after in-situ freezing was done in order to evaluate the properties of the sand. The results of the analysis indicated that the observed ground response was due to the effect of dilatancy of sand, which plays a significant role in the response of the dense saturated sand deposits during strong earthquake motions.

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化粧に関する心理学的研究は，1980年代から盛んになってきた．化粧は慈しむ化粧（スキンケア）と飾る化粧（メーキャップ・フレグランス)に大別されるが，感情に及ぼす影響に関する研究は，そのいずれもが高揚と鎮静をめぐるものであった. 喩えるなら，メーキャップによって心を固く結んで「公」の顔をつくって社会に飛び出し，帰宅後にはメーキャップを落とし，スキンケアをすることで心の結び目を解いて「私」の顔に戻るのである．すなわち，化粧は日常生活に組み込まれた感情調節装置である．

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両性イオン型高分子をレーヨンに混合紡糸した臭気物質のための新規な繊維状吸着材を試作し，水溶性臭気物質に対する吸着・除去特性を調べた．アンモニアに対する吸着特性を調べたところ，本繊維状吸着材は，繊維母材であるレーヨンと比較して明らかに大きい吸着量と吸着速度を示した．また，消臭加工繊維製品認証試験に従った減少率評価試験を行ったところ，本繊維状吸着材は酸やアミンに対して高い減少率を示したが，アルデヒドや硫化水素に対しては低い値であった．これらの結果から，本繊維状吸着材の吸着機構は，吸着材表面に形成される水和層への分配と両性イオン型官能基への静電的相互作用であることが示唆された．さらに，本繊維状吸着材の再利用の可能性について調べたところ，酢酸に対しては水洗浄により再生可能であることが判った．本検討の結果，本繊維状吸着材は水溶性でかつイオン性を有する臭気物質の吸着・除去に適用可能であると考えられた．

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In this paper, centrifuge shaking table tests were conducted in order to understand the performance of seawalls during a seismic event. The model tests showed that the displacement of the caisson was much affected by the seaward shear deformation of the sand seabed beneath it during shaking. It was also confirmed that an armored embankment played an important role in the displacement of the caisson during shaking. Based on these test results, a two-dimensional DEM-FEM coupled analysis method was newly developed to numerically predict the deformation of seawalls covered with armored embankments during earthquakes. The movements of the armor units were calculated by DE analysis and deformations of the caisson, rubble mound, sand seabed and backfill were calculated by FE analysis considering the non-linearity of the soil materials based on the effective stress. Dynamic interaction was taken into account by delivering the nodal displacements of the finite elements or the nodal forces converted from the contact forces through the imaginary distinct elements defined at the boundaries between the DE and FE domain. The applicability of this method to the prediction of the deformation of seawalls was verified through numerical simulations of the centrifuge model test.

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Seismic records obtained from a seismometer array located in downtown Tokyo Japan for about ten years were inversely analyzed to estimate the dynamic soil parameters. Due to the illposed nature of the problem, the simple and often used "least square method" does not properly estimate the parameters. The Extended Bayesian Method combined with the Akaike Bayesian Information Criterion was introduced to overcome this difficulty. The results obtained were compared with dynamic triaxial test results obtained at the time of the seismometer installation. The shear moduli agree quite well with the estimated results, however the damping ratios estimated are slightly higher than the ones obtained in the laboratory.

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This paper concerns the stability against overturning of the caissons on rubble mound subjected to wave loading. A theoretical discussion is first made of the stability of a leaning caisson during wave loading, as a single degree-of-freedom system. The expression for the lower bound of driving moments sufficient to overturn a given caisson is derived. A review is then made of the damages induced to a composite breakwater, which consisted of two adjoining Stretches B and C with slightly different sizes of caissons. Attention is called for the observation that most of the caissons in Stretch B were overturned, whereas no caissons in Stretch C were brought into overturning. This fact is examined in detail in the light of the theory of overturning, making it possible to estimate the destructive wave heights that are compatible with the observed patterns of damage in Stretches B and C of the composite breakwater.

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Stress wave theory is applied to open-ended pipe piles to clarify the effects of soil plug on the behaviour of piles during driving and static loading. Measured field data and various numerical models are reviewed ; methods are presented to calculate wave propagation in both the pile and the soil plug ; modelling is presented which takes into account the interaction between the soil plug and the pile ; also presented is simplified method to estimate the loadsettlement relation of the pipe pile in static loading. By correlating observed and calculated values in two analytical cases, the authors demonstrate that incorporation of the soil plug (modelled as a series of masses and springs) is required to correctly predict pile behaviour during driving and static loading.

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においに対するヒトの感覚強度は，加齢とともに変化することが確認されており，高齢者では徐々に感度が低下する．一方，においの質の違いを嗅ぎ分けるような識別力は，においの種類によって結果に違いが生じる．例えば，食品は身近で日常的に慣れ親しんでいるものであり，そのにおいとそうでないにおいとでは，馴染みのあるにおいのほうが識別率は高い．また，においに対する嗜好には，生活環境や習慣が関与する．ここでは，においに対する識別や嗜好の様子から，においがヒトの認知機能にどのような関わり方をしているのか考えてみたい．

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