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田崎, 和江 ; Tazaki, Kazue
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金沢大学理工研究域地球社会基盤学系
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田崎, 和江 ; Tazaki, Kazue
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金沢大学理工研究域地球社会基盤学系<br />Imogolite was studied by the scanning electron microscope. Imogolite which examined was separated
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from Kurayoshi pumice beds. The samples were dried successively in the sealed vessel at critical point of CO2. This drying method exceeds in preservation of natural surface of imogolite than that of air-drying.The form of imogolite was observed as fibres-like threads. The threads were curled and entangled forming nets which were piled up one above the other. The diameter of these threads ranged from 0.03 to 0.06 μm.
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田崎, 和江 ; 田崎, 耕市 ; 小松, 正幸 ; Tazaki, Kazue ; Tazaki, Koichi ; Komatsu, Masayuki
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金沢大学理工研究域地球社会基盤学系<br />Various volcanoclastic and sedimentary rocks were dredged from southern part of the Mariana Trenc
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h by 17th cruise of R/V D. Mendeleev. Clay mineralogical investigation of seventeen samples made clear the presence of abundant montmorillonite and a trace of chlorite. Phillipsite is the most abundant zeolite. Clinoptilolite and chabazite are also recognized.Occurrences of montmorillonite and phillipsite from deep sea sediments of the Pacific Ocean have been well established.
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田崎, 和江 ; Tazaki, Kazue
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金沢大学理工研究域地球社会基盤学系<br />The surface of fresh plagioclase usually shows smooth plane and has a weaving texture which sugge
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sts cryptic unmixing at vertical section (plate I-1). At the incipient stage of weathering, various features caused by chemical erosion appear on the plagioclase such as etch pits (plate II-5), conical hollows and square holes (plate I-4). Amorphous thin layer of which thickness is less than 0.5μm occurs successively or simultaneously on the surface (plate I-3). Occurrence of the thin layer suggests transitional state from frame work sillicate to clay minerals. The knobby substance, aggregate of fine and rounded spherules which is morphologically identified as spheroidal allophane occurs subsequently in the thin layer (plate II-7, 8). In the next stage of weathering, the following changes are observed; 1) Formation of imogolite (plate III-9) and gibbsite (plate III-10). 2) Formation of halloysite (plate III-11, 12). Imogolite occurs first as tiny bumps from the edges of the amorphous thin layer. Coexistence of gibbsite and imogolite is common in the same grain of weathered plagioclase. Gibbsite crystal shows short prismatic or tabular form (plate III-10 right upper). Observation of glassy matrix in the volcanic ash indicates that weathering should advance more easily in glassy material than in coexisting plagioclase (plate IV).
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Yamamoto, Masayoshi ; Matsui, Masao ; Igarashi, Shuichi ; Yoshioka, Mitsuo ; Hayakawa , Hironobu ; Kitagawa, Sadaharu ; 山本, 政儀 ; 松井, 正夫 ; 五十嵐, 修一 ; 吉岡, 満夫 ; 早川, 博信 ; 北川, 貞治
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金沢大学環日本海域環境研究センター<br />The concentrations of 239Pu and 137Cs due to fall-out, and 60Co originating from the nuclear powe
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r reactor in the sediments sampled at Urazoko Bay, Fukui Pref., Japan, were determined and their correlation with the particle size or the amount of glycerol adsorbed on the sediments as a measure of surface area of the sediment particles were examined. By the size segregation of sediment, the contents of 239Pu, 137Cs and 60Co were found to reach to the highest value in the fraction below 37 μm in diameter. The concentrations of these radionuclides for each size fraction were directly proportional to the amount of glycerol adsorbed on the sediment particles. Based on these facts, the normalization of the concentration of these artificial radionuclides by the amount of adsorbed glycerol was attempted. For the fraction below 0.5 mm in diameter of various sediments collected at around Urazoko Bay during 1975-1977. It was confirmed that the contents of 239Pu and 137Cs per unit amount of adsorbed glycerol were nearly constant, respectively. Furthermore, the pollution characteristics of 60Co in the sediments, such as the distribution and the accumulation, was clearly estimated by using such normalization.
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6. Difference of Chromosome Exchanges Due to Mitomycin C between Normal and Pericentric lnv(9) Cells
Shiraishi, Yukimasa ; 白石, 行正
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金沢大学解剖学第三<br />Several reports are available for the finding that mitomycin C (MMC) induces non-random chromosome exchan
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ges in human cells (Nowell 1964 ; Cohen and Shaw 1964 ; Br¢ggerand Johansen 1972). It has been shown that the majority of exchanges occurs preferentially between the constitutive heterochromatin of homologous chromosomes, especially in the secondary constriction regions of chromosomes 1, 9 and 16. This may be a result of the association of these chromosome regions during interphase, either through regular somatic pairing (Rao and Nataraj an 1967) or through a particular gathering effect of MMC (Kobayashi 1960). There is little information on the mitotic feature of the somatic pairing in chromosomes with rearrangements, particulary with pericentric inversions of mammalian cells. The present study was attempted to test the effect of MMC on cells with pericentric inv (9), one of the polymorphic variations in man (Hansmann 1976; Shiraishi and Makino 1977), and to compare the frequency of MMC-induced exchanges between normal and pericentric inv (9) cells.
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Komura, Kazuhisa ; Sakanoue, Masanobu ; Konishi, Kenji ; 小村, 和久 ; 阪上, 正信 ; 小西, 健二
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金沢大学理学部付属低レベル放射能実験施設<br />Since Barnes et al. (1956) proposed the uraniumionium (230Th) method of dating, many works hav
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e been performed for dating of fossil corals (Komura and Sakanoue, 1967; Bloom etal., 1974; Ku et al., 1974; and see the references therein). The 230Th method has a potential to estimate the absolute age back to about 300000 years. This method is one of the most reliable methods for a sample older than a few ten thousand years, since the half-life of 14C limits the applicable age back to about 40000 years. In order to determine 230Th age, activity ratios of 230Th/234U and 234U/238U must be measured. Alpha spectrometry has usually been performed to measure these isotopes. On the other hand, measurement of 230Th can be made indirectly by its daughter nuclide 222Rn by assuming radioactive equilibrium between 230Th and 226Ra (222Rn) (Nydal, 1975). If this assumption is acceptable, the 230Th can also be measured by 214Pb, 214Bi and 210Pb, the amount of which can be determined by y-spectrometry. Furthermore, 238U concentration can be determined by measuring low energy r-rays from its daughter nuclide 234Th. In this report, the non-destructive 226Ra/238U method is proposed for the dating of fossil corals by -spectrometry using a germanium detector Ge (Li) and a low energy photon spectrometer (LEPS). The non-destructive dating method has advantages over the conventional ones in that the elaborate and timeconsuming chemical procedures are unnecessary and no change in the chemical state occurs in the sample analyzed, hence, the same sample can be used for further investigation after the non-destructive measurement.
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大場, 達之 ; 菅原, 久夫 ; Ohba, Tatsunori ; Sugawara, Hisao
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渡邊, 定元 ; Watanabe, Sadamoto
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長井, 幸雄 ; 河野, 昭一 ; Nagai, Yukio ; Kawano, Shoichi
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