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Volume 34, Issue 4
Displaying 1-11 of 11 articles from this issue
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Yoshimichi IWASE, Akira UEDONO, Shoichiro TANIGAWA, Takayoshi SUZUKI1985 Volume 34 Issue 4 Pages 195-200
Published: April 15, 1985
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe precision measurement system of the Doppler broadening profiles of positron annihilation radiations using a simultaneous and comparative detection technique has been developed and was applied to the study of grown-in defects in indium phosphide (InP) . Annihilation energy spectra in the specimen to be examined and in a standard one were simultaneously measured by a single pure Ge detector. Each specimen incorporated a 22Na positron source in a sandwiched form between two identical samples. The collinear directional correlation of two photon annihilation allows us to route the output of ADC (analogue to digital converter) to different memory sections. For the purpose of discrimination which source emitted the analysed gamma ray, two auxiliary NaI (Tl) detectors were used. Such a simultaneous and comparative measurement was found to be free of drift in electronics during the course of experiments over 10 weeks. Furthermore, the coincidence measurement reduced the background due to 1.28 MeV prompt gamma rays. This technique was applied to the detection of a positional distribution of grown-in defects in an InP wafer, which was slivered along a plane involving growth axis from the single crystal ingot grown by a liquid encapsulated Czochralski technique. The narrowing of Doppler broadening profiles wes observed at the center and at the periphery of the wafer. This result well resembles the positional distribution of dislocations observed by the etch pit counting.View full abstractDownload PDF (604K) -
Michio HOSHI, Hiroshi IRUMAGAWA, Chiaki SAGAWA, Enzo TACHIKAWA1985 Volume 34 Issue 4 Pages 201-206
Published: April 15, 1985
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSA substoichiometric extraction method with nitroso-R salt (NRS) has been studied for the determination of trace Co in crud. The Co-NRS complex is extracted substoichiometrically into Capriquat-CHCI2 at pH 6.5 -9.0 in 20 min of shaking time. The analytical results ob-tained by the method are within 3% of relative error in the determination range of 5 to 50 pg. The proposed method is simple and has sensitivity of 0.5, tg, though Fe (II), Ni (II) and Cu (II) seriously interfere. The results applied for the determination of trace Co in crud are de-scribed.View full abstractDownload PDF (550K) -
Masakazu SAKAGUCHI, Masatoshi OHTA, Kazuyoshi UEMATSU, Akira WAKAMOTO1985 Volume 34 Issue 4 Pages 207-213
Published: April 15, 1985
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe continuous selective monitoring of tritium gas (HT) in the air containing HT and tritiated water vapor (HTO) was investigated by using the separation cell made of porous Vycor glass tube. On admitting the air containing HT or HTO into the separation cell, HT permeated immediately through the Vycor tube depending on the partial pressure, however, HTO permeated very slowly through the Vycor tube after initial induction period. The initial induction period was elongated with a rise of the temperature of separation cell and then the permeability of HTO decreased remarkably. In the air containing HT and water vapor, the permeation of HT through the Vycor tube was considerably restricted by the water vapor adsorbed on the Vycor tube at lower temperature (at 25°C) but it was hardly affected by water vapor at higher temperature (>50°C) since water vapor was difficult to adsorb on the Vyeor tube. These results indicated that HT in the air containing HT and water vapor can be continuously monitored by using the separation cell made of the porous Vycor glass tube.View full abstractDownload PDF (735K) -
Yoshiko KAMEYAMA, Tetsuji TOKORO, Hiroshi ASHIHARA1985 Volume 34 Issue 4 Pages 214-221
Published: April 15, 1985
Released on J-STAGE: September 07, 2010
JOURNAL FREE ACCESSThe metabolism of [2-14C] thymine and (2-14C) thymidine in the cotyledons and embryonic axes of black gram (Phaseolus mungo) seedlings was investigated.
Both [2-14C] thymine and [2-14C] thymidine degraded extensively into [14C] CO2. The rate of release of [14C] CO2 from [2-14C] thymine was much greater than that from [2-14C] thymidine. Radioactivity from both precursors was also observed β-ureidoisobutyric acid. This indicated that thymine was degraded by the reductive pathway of pyrimidine degradation.
Small amounts of [2-14C] thymine and [2-14C] thymidine were salvaged for deoxyribonucleo-tide and DNA synthesis. The highest incorporation of [2-14C] thymine and [2-14C] thymidine into the DNA fraction was observed in 24 hour-old cotyledons where net DNA synthesis was not observed. These precursors seem to be utilised for DNA synthesis of organelles of the cotyle-donary cells, probably mitochondria. In embronic axes, [2-14C] thymine is more effectively sal-vaged for DNA synthesis than [2-14C] thymine. The incorporation rate increased during the early phase of germination and attained its maximum at 48 h after which it decreased. No thymidine kinase activity was detected in either cotyledons or in the embryonic axes. Thymi-dine salvage seems to be catalysed by nucleoside phosphotransferase which is present both in the cotyledons and in the embryonic axes. This suggests that, in contrast to other pyrimidine and purine bases and nucleosides, no specific salvage system for thymine and thymidine is present in black gram seedlings.View full abstractDownload PDF (855K) -
Takayuki IRIE, Takuo NONOMURA, Madoka HANDA, Akiharu KITAHARA, Masamic ...1985 Volume 34 Issue 4 Pages 222-225
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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—Anti HBc—Isao KANAMORI, Satoshi NAKANO, Toshitake YABASHI, Hiroshi YOSHIDA, Chi ...1985 Volume 34 Issue 4 Pages 226-229
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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Zenji AYABE, Yuichi ICHIYA, Ikuko YAMAGUCHI, Yasuo KUWABARA, Makoto WA ...1985 Volume 34 Issue 4 Pages 230-233
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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Yoneho TABATA1985 Volume 34 Issue 4 Pages 234-241
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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Tadayoshi OGITA, Kunihiro GOMI, Yoshifumi FUKUSHI, Kunitoshi SEKINE, T ...1985 Volume 34 Issue 4 Pages 242-245
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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—Its basic description and study using positron emission tomography—Kazuo UEMURA1985 Volume 34 Issue 4 Pages 246-255
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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1985 Volume 34 Issue 4 Pages A25P-A42M
Published: April 15, 1985
Released on J-STAGE: July 21, 2010
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