result 270 件
| Author | Garaj, Slaven| Kambe, Takashi| Forró, László| Sienkiewicz, Andrzej| Fujiwara, Motoyasu| Oshima, Kokichi| |
|---|---|
| Published Date | 2003-10 |
| Publication Title | Physical Review B |
| Volume | volume68 |
| Issue | issue14 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/AMO/32778 |
|---|---|
| FullText URL | fulltext.pdf |
| Author | Ogata, Masana| Nagao, Yutaka| Jitsunari, Fumihiko| Kitamura, Naoji| Okazaki, Tokio| |
| Abstract | In order to ascertain whether black-crowned night herons (BCNH), white heron (Plumed Egrets (PE)) and domestic fowls are infected by JE virus and they serve as infection source ofJE, hemoagglutination inhibiting antibody and its 2·ME sensitive antibody in the sera of these birds were determined. Physico-chemical nature of fowl's antibody of JE produced by natural infection and their maternal antibody in the sera of chicks were examined. The results are briefly summarized as follows. 1) As to the herons captured in Tsudaka Town, two out of six adult night herons and three out of the four chicks showed positive HI reaction. On the other hand, HI reaction in the sera of two adult white herons and three chicks were negative. 2) As to the herons captured in Okayama City, twenty out of thirtytwo adult night herons and seven out of seventy white herons showed positive HI reaction in 1966 around the time when JE was prevalent in Okayama Prefecture. And six out of eleven night herons and one out of seven white herons showing positive HI reaction, responded positively to 2-ME sensitivity test. 3) The results indicate that white herons can be also infection source ofJE though less than in the case of night herons. 4) In the domestic fowls (white leghorn) kept at Takahashi District, eight out of twenty-seven fowls showed positive HI reaction. And six out of seven domestic fowls showing positive HI reaction responded positively to 2-ME sensitive reaction. 5) Transformation of JE antibody in the serum of hen from IgM to IgG was recognized. 6) Domestic chicken's sera having 1 : 640 of HI titer in the original serum and 1 : 320 of HI titer after 2-ME treatment were fractionated by gel filtration on Sephadex G-200 and the antibody activities present in the various fractions were determined. HI antibody activities occurred in both IgM and IgG classes of immunoglobulins. 7) Maternal HI antibodies reacting with JE virus were found in newly hatched domestic chickens from the eggs laid by hens with natural infection ofJE. And half life of HI antibodies in chicks was four days. 8) HI antibodies of JE in the serum of maternal immune-hens and chicken having maternal antibody were located in r-globulin fraction by starch block electrophoresis. 9) The results from 4) to 8) indicate the presence of natural infection ofJE in the domestic fowls. And domestic fowls can be infection source ofJE. |
| Amo Type | Article |
| Publication Title | Acta Medicinae Okayama |
| Published Date | 1970-04 |
| Volume | volume24 |
| Issue | issue2 |
| Publisher | Okayama University Medical School |
| Start Page | 175 |
| End Page | 184 |
| NCID | AA00041342 |
| Content Type | Journal Article |
| language | English |
| File Version | publisher |
| Refereed | True |
| PubMed ID | 4318407 |
| NAID | 120002311429 |
| JaLCDOI | 10.18926/21158 |
|---|---|
| Title Alternative | Experimental study of sulfur isotope exchange between S0(4)(2-) and H(2)S (aqueous) at 400℃ and 1000 bars water pressure |
| FullText URL | pitsr_050_001_015.pdf |
| Author | Kamada, Emi| Sakai, Hitoshi| Kishima, Noriaki| |
| Abstract | Experimental procedures used in this study are the same as those developed by Sakai and Dickson (1978). 0.005 M Na(2)S(2)O(3) solutions were heated to 400℃ under 1000 bar water pressure in a gold bag of Dickson gold-bag equipment (Fig. 1). At an elevated temperature Na(2)S(2)O(3) quickly and completely decomposed into 1:1 mixture of SO(4)(2-) and H(2)S (eq. (1)) and subsequent isotope exchange (eq. (2)) was monitored by consecutively withdrawing aliquots of solution for chemical and isotopic analyses at desired time intervals. For the preparation of SO(2) for isotope analyses, 2 to 5 mg BaSO(4) was thoroughly mixed with silica glass powder of 10 times the BaSO(4) in weight and heated to 1400℃ or so in sealed, evacuated silica glass tubings (see Fig. 2 and equation (4)). The technique is a modification of Holt and Engelkemeir (1971). The (18)O/(16)O ratios of SO(2) thus formed stayed constant by exchange with silica glass powder (Fig. 3). Numerical data of the three runs performed in this study are summarized in Tables 1 to 3. In runs 2 and 3, a small aliquot of (34)S- enriched H(2)SO(4) was added into the starting solution and thus equilibrium was approached from above the quilibrium value (see Fig. 4). When isotope exchange occurs between two molecules, X and Y, the reaction rate, r, is related to the extent of exchange, F, at given time, t, by equation (17), where X and Y indicate concentrations of given species, α(e), α(o) and α denote the fractionation factor at equilibrium, at time t=0 and at an arbitrary time t, and F = (α - α(o))/(α(e) - α(0)) or the extent of isotope exchange. Assuming the exchange rate is of the first order with respect to both X and Y and to the β'th power of hydrogen ion activity, a(H)(+), eq. (17) reduces to eq. (19), where k(1) denotes the rate constant. If X, Y and pH of solution stayed constant during the run, the half-time, t(1/2), of the exchange reaction can be obtained graphically as shown in Fig. 5. The t(1/2) for runs 1, 2, and 3 are determined to be 5.8, 5.5 and 6.1 hrs, respectively. Introducing F=0.5 and t=t(1/2) into eq. (19), we obtain eq. (20) which is graphically shown in Fig. 6 using the data by the present work and those by Sakai and Dickson(1978). The numerical values of log k(1) + 0.16 may be obtained by extrapolating the lines to pH=0 and, from these values, the rate constant, k(1) , may be calculated for temperatures of 300° and 400℃. From these two values of k(1) and from the Arrhenius plot, the activation energy of the exchange reaction was calculated to be 22 kcal/mole, a much smaller value than 55 kcal/mole obtained by Igumnov (1977). The value of β is found to be 0.29 at 300℃ and 0.075 at 400℃, although the physico-chemical nature of β is not clear to the present authors. Using these values, eq. (24), where C is a constant, is derived which would enable us to calculate the t(1/2) of any system of known ΣS and pH. However, as we do not know yet how β varies with different systems, eq. (24) is applicable only to limited systems in which temperature, total sulfur contents and pH are similar to those of the present study. Fig. 7 illustrates how t(1/2) varies with pH and total sulfur content at 300° and 400℃ and predicts t(1/2) for some solutions obtainable by hydrothermal reactions of seawater with various igneous rocks. The average equilibrium fractionation factor at 400℃ obtained by this study is 1.0153, in good accord with 1.0151 given by Igumnov et al. (1977). Theoretical fractionation factors between SO(4)(2-) and H(2)S have been calculated by Sakai (1968) , who gives too high values compared to the experimental data obtained by this and other researchers (Fig. 9). In the present study, the reduced partition function ratio (R.P.F.R.) of SO(4)(2-) was recalculated using two sets of the vibrational frequencies of SO(4)(2-) (shown in Table 5) and the valence force fields of Heath and Linnett (1947), which reproduces the observed frequencies of SO(4)(2-) better than Urey-Bradley force field used by Sakai (1968). The results of new calculation are shown in Table 6. This table also includes the R.P.F.R. of H(2)S which was calculated by Thode et al. (1971). Using these new R.P.F.R. of SO(4)(2-) and H(2)S, the fractionation factors between SO(4)(2-) and H(2)S were calculated and are listed in the last column of Table 6 and plotted in Fig. 9. Fig. 9 indicates that the new calculation gives values more shifted from the experimental values than before. The major sulfate ions in our solution at 300° and 400℃ exist as NaSO(4)(-) (Sakai and Dickson, 1978; see also Table 4 of this paper) and, therefore, the measured fractionation factors are those between NaSO(4)(-) and H(2)S. The discrepancy between the theory and experiments may, at least, be partially explained by this fact, although other more important reasons, which are not known to us at the moment, may also exist. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1980-03-25 |
| Volume | volume50 |
| Start Page | 1 |
| End Page | 15 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002310990 |
| JaLCDOI | 10.18926/21139 |
|---|---|
| Title Alternative | Isotopic Analysis of Rb and Sr Using a Full Automatic Thermal Ionization Mass Spectrometer |
| FullText URL | pitsr_052_051_070.pdf |
| Author | Kagami, Hiroo| Okano, Osamu| Sudo, Hiroshi| Honma, Hiroji| |
| Abstract | Analytical method for strontium isotope ratios and rubidium and strontium concentrations has been established using a full automatic thermal ionization mass spectrometer. The machine is a modified model "MAT 260" of Varian MAT LTD. Each of simultaneously loaded thirteen samples is successively analysed full automatically following to a specific controling program which has been selected as being most suitable for each sample. However, the most characteristic feature of this machine compared to other types is computer controled peak jumping and peak centering before measurment of the signal of each peak. By this the accuracy of isotopic measurement has been surprisingly improved. Analytical procedures are described in detail which include decomposition of samples, separation of Rb and Sr, loading samples on filament and mass spectrometry. Accuracy and reproducibility of isotope analyses are excellent : 43 separate analyses of standard sample NBS 987 over one year gave a mean (87)Sr/(86)Sr ratio of 0.710238 (normalized to the (88)Sr/(86)Sr ratio of 8.375209) with a value of 20δ of 0.000008. The ratio obtained is slightly higher than the value of 0.71014 given by NBS, but it is almost identical to the mean of recently reported twenty analyses. Our determinations for Rb and Sr concentrations of standard samples are as follows : JG-1, Rb 184.4 ppm, Sr 185.5 ppm; JB-l, Rb 41.5Ppm, Sr 448.4 ppm , each of which is near the mean of reported values for corresponding element of the sample (ANDO et al., 1974). Concentrations of Rb and Sr in pure water and regents used in chemical treatement of samples were also measured; a possible error due to the contamination is negligible for most geochemical samples. |
| Publication Title | 岡山大学温泉研究所報告 |
| Published Date | 1982-03-25 |
| Volume | volume52 |
| Start Page | 51 |
| End Page | 70 |
| ISSN | 0369-7142 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002310968 |
| JaLCDOI | 10.18926/ESR/19850 |
|---|---|
| Title Alternative | 岡山県に分布する白亜紀前期羽山層砕屑物質の供給源：砕屑粒の鉱物化学組成とモード組成から導かれる制約 |
| FullText URL | 016_029_042.pdf |
| Author | Asiedu, Daniel K.| Suzuki, Shigeyuki| Shibata, Tsugio| |
| Abstract | Petrographic and phase chemistry studies of detrital grains were carried out on sandstones from the Lower Cretaceous Hayama Formation, Inner Zone of Southwest Japan, to determine their provenance and the tectonic setting during the early Cretaceous. The results of the modal mineralogy suggest that the Hayama Formation has magmatic arc provenance and that deposition of the sediments took place in the back-arc areas with detritus mostly derived from the magmatic arc and rifted continental margins. The chemical compositions of chromian spinel, chlorite and sphene indicate that significant proportions of the detrital grains were derived from mafic and/or ultramafic sources. The source areas are the mafic and ophiolitic rocks in the Sangun-Renge and Akiyoshi terranes and the felsic volcanic rocks probably from either the Akiyoshi terrane or a source not presently exposed in southwest Japan. However, minor amounts of the detritus were derived from the basement rocks; i.e., carbonates and siliciclastic rocks of the Akiyoshi terrane and the metamorphosed mafic rocks of the Chizu terrane. |
| Keywords | modal analysis sandstone mineral chemistry provenance Hayama Formation |
| Publication Title | Okayama University Earth Science Report |
| Published Date | 2009-12-25 |
| Volume | volume16 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 42 |
| ISSN | 1340-7414 |
| language | English |
| Copyright Holders | 岡山大学地球科学研究報告編集委員会 |
| File Version | publisher |
| NAID | 120002309000 |
| Author | Hujioka, Yosiitu| |
|---|---|
| Published Date | 1956-11-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume68 |
| Issue | issue11 |
| Content Type | Journal Article |
| Author | Kobayashi, Minoru| |
|---|---|
| Published Date | 1958-12-31 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume70 |
| Issue | issue12 |
| Content Type | Journal Article |
| Author | Nakayama, Goro| |
|---|---|
| Published Date | 1959-02-28 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume71 |
| Issue | issue2-2 |
| Content Type | Journal Article |
| Author | Irino, Shozo| Ota, Zensuke| Okada, Koichi| Miyoshi, Isao| Sezaki, Tatsuo| Kawamura, Norio| Kunisada, Mineo| Ikejiri, Koji| Sato, Masanobu| Sota, Susumu| Suzaki, Masanori| |
|---|---|
| Published Date | 1963-03-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume75 |
| Issue | issue1-3 |
| Content Type | Journal Article |
| Author | Nakahaara, Takashi| |
|---|---|
| Published Date | 1959-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume72 |
| Issue | issue1 |
| Content Type | Journal Article |
| Author | Hiraki, Yoshio| |
|---|---|
| Published Date | 1968-04-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume80 |
| Issue | issue3-4 |
| Content Type | Journal Article |
| Author | Goto, Nobuyuki| |
|---|---|
| Published Date | 1970-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume82 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| Author | Seo, Kenji| |
|---|---|
| Published Date | 1975-10-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume87 |
| Issue | issue9-10 |
| Content Type | Journal Article |
| Author | Izawa, Tetsuichi| |
|---|---|
| Published Date | 1975-06-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume87 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Nakamura, Norio| |
|---|---|
| Published Date | 1978-06-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume90 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Fujii, Hiroshi| |
|---|---|
| Published Date | 1966-12-30 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume78 |
| Issue | issue11-12 |
| Content Type | Journal Article |
| Author | Shibata, Naoki| |
|---|---|
| Published Date | 1992 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume104 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| Author | Takatsuka, Shojiro| |
|---|---|
| Published Date | 1992 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume104 |
| Issue | issue5-6 |
| Content Type | Journal Article |
| JaLCDOI | 10.18926/14353 |
|---|---|
| Title Alternative | A Research on Concepts of Particle for Substance in High School Chemistry |
| FullText URL | 006_033_038.pdf |
| Author | Kita, Masakazu| Watanabe, Toshio| Gilbert, Onwu| |
| Abstract | 中学校理科、並びに高校化学における基礎概念の物質の粒子概念や原子・分子の粒子としての表現についてある普通科高校の高校生1年から3年までの全クラスの生徒997名対象に、イメージ図を用いて理解度を測定する目的で調査を行い、イメージとして物質の粒子概念が高校生にどうとらえられているかを明らかにした。この結果より全般的に基礎知識の理解とその応用について不十分であることがわかった。また、全学年で化学変化と物理変化の違いについてイメージができておらず、化学の本質の理解の点で問題点があることがわかった。 |
| Keywords | 中学校理科(natural science in Junior high school level) 高校化学(high school chemistry) 粒子概念(concept of particles) 純物質と混合物(pure substance and mixture) 化学反応(chemical reaction) |
| Publication Title | 岡山大学教育実践総合センター紀要 |
| Published Date | 2006-03-25 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 33 |
| End Page | 38 |
| ISSN | 1346-3705 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002308087 |
| Author | Kimura, Goro| |
|---|---|
| Published Date | 1992-12 |
| Publication Title | 岡山医学会雑誌 |
| Volume | volume104 |
| Issue | issue11-12 |
| Content Type | Journal Article |
