著者

石井 吉夫 小山 舜二 今泉 克英

出版者

日本水産増殖学会

雑誌

水産増殖 (ISSN:03714217)

巻号頁・発行日

vol.28, no.3, pp.128-133, 1980-12-25 (Released:2010-03-09)

参考文献数

5

著者

林 治助 山田 拓司 渡辺 貞良

出版者

繊維学会

雑誌

繊維学会誌 (ISSN:00379875)

巻号頁・発行日

vol.30, no.5-6, pp.T190-T198, 1974-05-10 (Released:2008-11-28)

参考文献数

9

被引用文献数

2 4

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It was found that there was a difference between X-ray diffractograms of Na-Cellulose I derived from the cellulose I family (I and IIII) and that from the cellulose II family (II, IIIII and IVII), and we calssified them as Na-Cellulose II and Na-Cellulose III, respectively. Both Na-Cellulose II and III regenerated cellulose II by washing with cold water. When decomposed with hot water, however, Na-Cellulose II regenerated mixture of cellulose I and II, and Na-Cellulose III regenerated cellulose II. Namely, Na-Cellulose has memory of the crystalline structure of the original cellulose.As described in our previous paper, the chain conformation of cellulose is thought to be a difference between cellulose I and II families, the former has “bent” type and the latter has “bent and twisted” type comformation.The memory of the original structure may be due to the retaining of chain conformation during meroerization and regeneration. When Na-Cellulose II is decomposed by cold water, the chain conformation is changed from “bent” to more stable “bent and twisted” type owing to strong swelling and hydration, and cellulose II was regenerated.

著者

So Yamada Yuki Matsumuro Takashi Inoue Tomonori Kitamura Saki Itonori Mutsumi Sugita Masahiro Ito

出版者

公益社団法人 日本油化学会

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

vol.56, no.3, pp.129-136, 2007 (Released:2007-02-10)

参考文献数

36

被引用文献数

2 4

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A novel sulfated glycosphingolipid, SGL-1, was isolated from the ascidian Ciona intestinalis, prepared from chloroform/methanol extracts and fractionated successively on DEAE Sephadex-A25, Florisil and Iatrobeads column chromatographies. Chemical structural analysis was performed using methylation analysis, gas-liquid chromatography, combined gas-liquid chromatography-mass spectrometry, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry and 1H-NMR spectroscopy. This chemical structure is presented as GlcCer I6-Sulfate. The ceramide moiety was specified by t16:0, t17:0, br,t17:0, t18:0 and br,t18:0 as sphingoids, and 2-hydroxy, saturated fatty acids as represented by docosanoic and tetracosanoic acids.

著者

Chanawong Hongsuwan Wichai Eungpinichpong Uraiwan Chatchawan Junichiro Yamauchi

出版者

理学療法科学学会

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.27, no.2, pp.505-508, 2015 (Released:2015-02-17)

参考文献数

25

被引用文献数

4 13

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[Purpose] The aim of this study was to determine the effects of Thai massage on physical fitness in soccer players. [Subjects and Methods] Thirty-four soccer players were randomly assigned to receive either rest (the control group) or three 30-minute sessions of Thai massage over a period of 10 days. Seven physical fitness tests consisting of sit and reach, hand grip strength, 40 yards technical agility, 50-meter sprint, sit-ups, push-ups, and VO2, max were measured before and after Thai massage or rest. [Results] All the physical fitness tests were significantly improved after a single session of Thai massage, whereas only the sit and reach, and the sit-ups tests were improved in the control group. [Conclusion] Thai massage could provide an improvement in physical performance in soccer players.

著者

早雲 孝信 東 健 中島 正継 安田 健治朗 趙 栄済 向井 秀一 水間 美宏 芦原 亨 水野 成人 平野 誠一 池田 悦子 加藤 元一 徳田 一 竹中 温 泉 浩 井川 理 青池 晟 川井 啓市

出版者

一般財団法人 日本消化器病学会

雑誌

日本消化器病学会雑誌 (ISSN:04466586)

巻号頁・発行日

vol.88, no.8, pp.1539-1544, 1991 (Released:2007-12-26)

参考文献数

19

被引用文献数

2

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ras遺伝子は, そのpoint mutation により活性化される癌遺伝子として知られている. 今回, われわれは oligonucleotide hybridization assay を用いて,大腸癌86例における K-ras codon 12, 13のpoint mutation の有無について検索した. その結果, codon 12に32例, codon 13に1例の33例 (38%) に point mutation を認めた. 変異の比率を腫瘍の存在部位, 組織型, 深達度, リンパ節転移, ステージ分類別に検討したが, 有意な関係は認められなかつた. しかし, 深達度mやsmといつた早期の癌においても高頻度に変異が検出され, ras遺伝子の point mutation が癌の進行過程というよりも発癌の過程に関係していることが推察された.

著者

江口 正登

出版者

西洋比較演劇研究会

雑誌

西洋比較演劇研究 (ISSN:13472720)

巻号頁・発行日

vol.13, no.2, pp.84-93, 2014-03-31 (Released:2014-04-03)

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This paper investigates Snow, a theatre piece written and directed by John Jesurun, which premiered in 2000. The piece has three unique features. The first is its theatrical space. It lacks a conventional auditorium but features a walled central area. The audience first enters the area and then watches the performance from there. This is linked to the second feature: the hiding, if not excluding, of the live performance. The central area is equipped with four screens above each wall, on which the audience watches the performance. Thus, although the actual performances are conducted just outside the walled area, it is not directly presented to the audience. The last feature is the “Virtual Actor.” This is, in fact, a camera, but due to its preset program, it can move as if of its own free will. This camera is not shown on the screens; however, the audience can sense its presence through a set of shots taken from the camera’s viewpoint. This paper derives two main arguments from Snow by focusing on this Virtual Actor. The first is the displacement of the relation between human and machine. The quasi-autonomously operating camera, prompting a revision of the concept of the subject, questions the way in which we have separated the human, as a self-evidently autonomous being, from the machine, which is conceived as a non-autonomous being. Turning from a technical device such as the Virtual Actor to the story of Snow, which depicts the background of the contemporary media industry, we can find a similar question concerning the human-machine boundary. In one episode, people try to utilize “the tone and inflection of [one’s] voice” as material for encryption. In treating allegedly natural elements, such as “tone and inflection,” as a medium for the highly cultural operation of encryption, this episode suggests a cybernetic vision similar to the one discussed by Donna Haraway. In her view, through the reconception of organisms as coded texts, biology transforms into cryptology. We can thereby consider the living organism to be a communication device that has no fundamental difference from a machine. The piece’s second argument lies in its metafictional inquiry. Narratology is based on the assumption that story space and discourse space are two distinct domains that must not be confused. This assumption, however, is challenged by the Virtual Actor. On the one hand, the Virtual Actor resides in discourse space, as it is a recording device designed for narration. At the same time, it is a character that naturally belongs to story space. The Virtual Actor’s double identity destabilizes the division between these two spaces.

著者

佐藤 信 蓼沼 誠 大場 俊輝 高橋 康次郎 小池 勝徳

出版者

公益財団法人 日本醸造協会

雑誌

日本釀造協會雜誌 (ISSN:0369416X)

巻号頁・発行日

vol.71, no.5, pp.387-390, 1976-05-15 (Released:2011-11-04)

参考文献数

10

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FPD付ガスクロマトグラフを用いて, 白米および醸造工程中の揮発性硫黄化合物の変化について検討し, 次の結果を得た。1.精米歩合75%白米から揮発性硫黄化合物としてメチルメルカプタン, ジメチルスルフィド, ジメチルジスルフィドが検出された。2.古米からはジメチルスルフィドはほとんど検出されなかった。3.白米蒸きょう時留液から硫化水素, メチルメルカプタン, ジメチルスルフィド, ジメチルジスルフィドが検出され, その最大量に達する時間に各白米間で差異がみられた。4.製麹工程における揮発性硫黄化合物の変化はごく微量であった。5.醪からは硫化水素が検出された。

著者

Seshito Shimizu Kohei Shimamoto Hironobu Tsuchiya

出版者

Japan Society of Physical Education, Health and Sport Sciences

雑誌

International Journal of Sport and Health Science (ISSN:13481509)

巻号頁・発行日

pp.201411, (Released:2015-02-24)

参考文献数

18

被引用文献数

3 6

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The purpose of this study was to investigate the relationships between life skills and post-graduation employment for top college student athletes. In March 2011, 24 Japanese top level male wrestlers (mean age=22.0±0.2) who had graduated from university in March 2011 answered to the Appraisal Scale of Required Life Skills for College Student Athletes (Shimamoto et al., 2013). This scale has following 10 subscales: stress management, setting goals, thinking carefully, appreciating others, communicating, maintaining etiquette and manners, always making one's best effort, taking responsibility for one's own behavior, being humble, and maintaining physical health and well-being. The relationships between life skills acquisition level assessed in March 2011 and employment situations (employed or unemployed) by March 2012 were examined with nine members who had not obtained employment by the time of graduation from university. The analysis results showed that the employment group (n=4) who had acquired employment within one year of graduation indicated a higher acquisition level compared to the unemployed group (n=5) with regard to setting goals (p<.05). Therefore, it was suggested that there is the positive relationship between setting goals and post-graduation employment for top college student wrestlers.

著者

EunJung Chung Sang-In Park Yun-Yung Jang Byoung-Hee Lee

出版者

理学療法科学学会

雑誌

Journal of Physical Therapy Science (ISSN:09155287)

巻号頁・発行日

vol.27, no.2, pp.513-516, 2015 (Released:2015-02-17)

参考文献数

21

被引用文献数

2 29

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[Purpose] The purpose of this study was to determine the effects of brain-computer interface (BCI)-based functional electrical stimulation (FES) on balance and gait function in patients with stroke. [Subjects] Subjects were randomly allocated to a BCI-FES group (n=5) and a FES group (n=5). [Methods] The BCI-FES group received ankle dorsiflexion training with FES according to a BCI-based program for 30 minutes per day for 5 days. The FES group received ankle dorsiflexion training with FES for the same duration. [Results] Following the intervention, the BCI-FES group showed significant differences in Timed Up and Go test value, cadence, and step length on the affected side. The FES group showed no significant differences after the intervention. However, there were no significant differences between the 2 groups after the intervention. [Conclusion] The results of this study suggest that BCI-based FES training is a more effective exercise for balance and gait function than FES training alone in patients with stroke.

著者

佐藤 裕紀子

出版者

一般社団法人 日本家政学会

雑誌

日本家政学会誌 (ISSN:09135227)

巻号頁・発行日

vol.66, no.2, pp.54-64, 2015 (Released:2015-02-19)

参考文献数

35

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This study reveals the conditions of teachers' pressure of work in terms of time use and time conflict, considering both their professional and family lives. The study illustrates future challenges in teachers' lives by examining the relationship between the pressure they are under and attitudes toward work. A daily life survey was administered to 342 public junior high school teachers in Mito City. The results were analyzed and the following findings were obtained.   Compared with employees in other sectors, teachers' working hours are extremely long, irrespective of gender, and teachers' free time and sleeping time are extremely short. Although most teachers felt that their jobs were worth the time they put in, they felt too busy. Female teachers with children at elementary school age or younger spend long hours on work and housework: approximately 60% of their free time at home is spent on housework. Although their family life is supported by their parents, who either live with them or nearby, they have a greater sense of pressure and lack of time than other groups and can be said to be in a “busy state of mind.” To improve educational quality, environments in which teachers preparing to form families can easily continue their jobs must be established.

著者

Tatsuro Suzuki Toshikazu Morishita Yuji Mukasa Shigenobu Takigawa Satoshi Yokota Koji Ishiguro Takahiro Noda

出版者

日本育種学会

雑誌

Breeding Science (ISSN:13447610)

巻号頁・発行日

vol.64, no.4, pp.339-343, 2014 (Released:2015-01-10)

参考文献数

23

被引用文献数

4 32

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In a screening of about 500 lines of Tartary buckwheat, we identified lines that contained no detectable rutinosidase isozymes using an in-gel detection assay. We confirmed that seeds of these individuals had only a trace level of in-vitro rutinosidase activity. To investigate the heritability of the trace-rutinosidase characteristic, we analyzed the progeny of crosses between rutinosidase trace-lines, ‘f3g-162’, and the ‘Hokkai T8’. The F2 progeny clearly divided into two groups: those with rutinosidase activity under 1.5 nkat/g seed (trace-rutinosidase) and those with activity over 400 nkat/g seed (normal rutinosidase). The segregation pattern of this trait in F2 progeny exhibited 1 : 3 ratio (trace-rutinosidase : normal rutinosidase), suggesting that the trace-rutinosidase trait is conferred by a single recessive gene; rutinosidase-trace A (rutA). In addition, sensory panelists evaluated the bitterness of flour from trace-rutinosidase individuals and did not detect bitterness, whereas flour from normal rutinosidase individuals was found to have strong bitterness. Although at least three bitter compounds have been reported in Tartary buckwheat seeds, our present findings indicate that rutin hydrolysis is the major contributing factor to bitterness. In addition, the trace-rutinosidase line identified here, ‘f3g-162’, is a promising material for generating a non-bitter Tartary buckwheat variety.

著者

三好 順也 高橋 暁 三島 康史

出版者

日本陸水学会

雑誌

陸水学雑誌 (ISSN:00215104)

巻号頁・発行日

vol.73, no.3, pp.199-206, 2012 (Released:2013-12-05)

参考文献数

36

被引用文献数

2

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陸から海へ流入する栄養塩負荷は,その一部をノリ養殖によって回収・利用されており,海から陸へのフローの一つとしての役割を担ってきた。しかし近年,各地でノリ色落ちの被害が頻発しており,顕著な生産量の低下を招いている。そこで瀬戸内海の東部に位置し養殖ノリの産地である備讃瀬戸海域を対象として,養殖被害の生じやすい地区を明らかにするとともに,ノリ漁場への栄養塩供給に着目し,ノリ生産密度との関係について解析を行った。その結果,岡山県側では大きな変動は確認されないものの,生産規模の大きい香川県東部では2002年度に生産量の落ち込みが確認された。1995~2006年の2月における溶存態無機窒素の平均濃度からは,色落ち被害の始まる3μg-at L-1を全域で下回っており,備讃瀬戸海域はノリ養殖被害の発生する可能性の高い海域であることが考えられた。また備讃瀬戸東部の東讃地区は,平均潮流流速10 cm sec-1に満たないほどに潮流が弱く,栄養塩の供給不足となる可能性が高い海域であると考えられた。さらに栄養塩フラックスに対して,単位面積あたりのノリ生産量の大きい香川県東部で養殖被害が生じていたことから,栄養塩供給と生産密度のバランスはノリ養殖被害発生の一要因であることがわかった。

著者

長谷川 夏樹 日向野 純也

出版者

日本水産増殖学会

雑誌

水産増殖 (ISSN:03714217)

巻号頁・発行日

vol.58, no.1, pp.155-158, 2010-03-20 (Released:2012-09-29)

参考文献数

13

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伊勢湾内の6地区で漁獲あるいは調査採集されたアサリを用いて殻長-重量のアロメトリー式を検討した。伊勢湾全域の測定値を用いた殻長(L, mm)-総湿重量(TWW, gWW)のアロメトリー式は,TWW = 2.4×10-4×L2.97(決定係数:0.99)となり,伊勢湾域のアサリに共通のアロメトリー式が適用可能であることが明らかとなった。伊勢湾全域の測定値を用いた殻長-軟体部乾燥重量(SDW, gDW)のアロメトリー式は,SDW = 3.6×10-6×L3.30(決定係数:0.88)であったが,95%予測区間は広範囲におよんだ。また,伊勢地区における殻長-軟体部乾燥重量の時期別アロメトリー式にもばらつきが見られた。したがって,殻長-軟体部重量の関係においては,地域別,季節別あるいはサイズ別にアロメトリー式を検討することが必要であろう。

著者

So Sugiyama Shigeru Satoh

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-025, (Released:2015-02-21)

被引用文献数

7

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2,4-Pyridinedicarboxylic acid (2,4-PDCA) was shown to prolong the vase life of cut flowers of spray-type ‘Light Pink Barbara’ (LPB) carnation, mainly due to the reduced ethylene production caused by inhibition of 1-aminocyclopropane-1-carboxylate oxidase in the flowers. In addition, 2,4-PDCA has been suggested to accelerate flower opening in the flowers (Satoh et al., 2014). In the present study, we successfully developed a procedure to evaluate the activity of chemicals to accelerate flower (bud) opening by determining the shortened time (in days) to flower opening. Using this procedure, we could show the activities of several PDCA analogs to accelerate flower opening, in addition to their already-known activity to extend the vase life in cut flowers of ‘LPB’ carnation. Judging from their effectiveness in the acceleration of flower opening and extension of vase life, 2,3-PDCA and 2,4-PDCA were thought to be suitable agents for treatment of the flowers. The present study confirmed that PDCAs accelerate flower opening and retard senescence, which increase the number of open flowers, resulting in extension of the vase life of cut flowers of ‘LPB’ carnation.

著者

Tadahisa Higashide Ken-ichiro Yasuba Takeshi Kuroyanagi Akimasa Nakano

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.MI-010, (Released:2015-02-21)

被引用文献数

3 24

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To investigate the mechanism of yield increase by elevated carbon dioxide (CO2) and fogging in Japanese tomato cultivars (Solanum lycopersicum), total above-ground dry matter (TDM), fraction of dry matter distribution to fruit (FDF), and photosynthetic characteristics were measured in 3 Japanese cultivars grown in elevated CO2 with fogging and ambient CO2 without fogging. Fresh fruit yield and TDM were improved by the elevated CO2 and fogging in the 3 Japanese cultivars. Light use efficiency (LUE) was also increased by the elevated CO2 and fogging. No significant decrease in FDF was observed by the elevated CO2 and fogging in 2 Japanese cultivars, ‘Asabiyori 10’ and ‘Junkei Aichi Fast’. Thus, the increase in TDM by higher LUE contributed directly to the yield increase in these 2 cultivars. However, FDF in ‘Momotaro York’ was decreased significantly by the elevated CO2 and fogging. Thereby, the yield increase by the elevated CO2 and fogging was diminished in ‘Momotaro York’ in spite of the increase in TDM. The number of trusses having immature fruit in ‘Momotaro York’ under elevated CO2 and fogging was significantly higher than those of the others, although no increase in the number of trusses having immature fruit was observed in the other 2 cultivars. Although vegetative growth characteristics such as leaf area, LAI, and fresh and dry weights of leaves and stem were increased by the elevated CO2 and fogging, no negative effects such as a change in light-extinction coefficient and a decrease in maximum photosynthetic rate were observed. The elevated CO2 and fogging increased the number of harvested fruit but decreased weight per fruit, namely, fruit size, in the 3 cultivars.

著者

Hiroshi Iwanami Yuki Moriya-Tanaka Chikako Honda Masato Wada

出版者

一般社団法人 園芸学会

雑誌

The Horticulture Journal (ISSN:21890102)

巻号頁・発行日

pp.CH-112, (Released:2015-02-21)

被引用文献数

1 2

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The thinning of flowers or fruit is an essential part of the commercial production of quality apples. Although chemical thinners are generally used in apple orchards throughout the world, hand-thinning remains essential for controlling crop load to improve fruit quality and return bloom. The objectives of this study were to investigate factors that determine the time required for hand-thinning and to elucidate cultivar-related efficiency of hand-thinning. In all cultivars, the time taken for hand-thinning per cluster became shorter after petal fall, but the degree of this decrease differed among cultivars. The time taken for hand-thinning depended on both how much and when natural abscission of fruitlets occurred. The times required for hand-thinning were very similar among clusters with four, five, or six flowers/fruitlets, which was twice as long as that required for clusters with two or three flowers/fruitlets. This means that the time required for hand-thinning clusters is critically reduced when the number of flowers/fruitlets within a cluster is three or fewer. The time required for hand-thinning clusters of axillary buds became significantly longer from bloom to 7 days after bloom, and then decreased gradually from 7 to 25 days after bloom. When the proportion of clusters with three or fewer fruitlets is 50% at 15 days after bloom, the planting area of the cultivar that a person is able to hand-thin (six hours per day) from 10 to 30 days after bloom was 24.3 a, which was 40% larger than that of a cultivar in which the proportion of clusters with three or fewer fruitlets is 50% at 30 days after bloom (17.4 a). Therefore, the introduction of cultivars in which fruit abscission occurs at an early stage and on a large scale is a solution for reducing the labor costs of hand-thinning.

著者

谷口 忠大 椹木 哲夫

出版者

一般社団法人 人工知能学会

雑誌

人工知能学会論文誌 (ISSN:13460714)

巻号頁・発行日

vol.19, no.6, pp.493-501, 2004 (Released:2004-09-03)

参考文献数

13

被引用文献数

2 3

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In this paper, a new machine-learning method, called Dual-Schemata model, is presented. Dual-Schemata model is a kind of self-organizational machine learning methods for an autonomous robot interacting with an unknown dynamical environment. This is based on Piaget's Schema model, that is a classical psychological model to explain memory and cognitive development of human beings. Our Dual-Schemata model is developed as a computational model of Piaget's Schema model, especially focusing on sensori-motor developing period. This developmental process is characterized by a couple of two mutually-interacting dynamics; one is a dynamics formed by assimilation and accommodation, and the other dynamics is formed by equilibration and differentiation. By these dynamics schema system enables an agent to act well in a real world. This schema's differentiation process corresponds to a symbol formation process occurring within an autonomous agent when it interacts with an unknown, dynamically changing environment. Experiment results obtained from an autonomous facial robot in which our model is embedded are presented; an autonomous facial robot becomes able to chase a ball moving in various ways without any rewards nor teaching signals from outside. Moreover, emergence of concepts on the target movements within a robot is shown and discussed in terms of fuzzy logics on set-subset inclusive relationships.

著者

田村 幸雄 須田 健一 吉田 昭仁 松井 正宏

出版者

一般社団法人 日本風工学会

雑誌

日本風工学会年次研究発表会・梗概集 平成19年度日本風工学会年次研究発表会

巻号頁・発行日

pp.40, 2007 (Released:2008-01-11)

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2005年12月25日,JR羽越本線特急いなほ14号が寒冷前線の通過中の山形県酒田市付近において,突風に煽られて脱線し,死者5名,負傷者32名の痛ましい惨事が発生した。運転手や乗客の証言や当時の気象状況等から判断して,脱線に突風が大きく絡んでいたであろうことは明白である。しかし,事故から1年以上経過した現在(2007年2月)においても,突風が竜巻によるものかダウンバーストによるものか,あるいは他の原因によるものかを,気象庁は一切明らかにしていない。また,最近の一連の突風災害に対して社会が大きな関心を持つようになった最大の要因である当該脱線事故をもたらしたこの突風について,気象庁のHPに公開されている「災害をもたらした竜巻一覧(1971~2006)」にも「災害をもたらした気象事例(平成元~17年)」にも収録されておらず,まるで何事もなかったかの如き様子である。本報告は,脱線現場の直ぐ西側にあり,突風によって破壊した農機具小屋に作用する風力実験結果,および基礎,壁面,屋根面などの飛散状況の詳細な調査に基づいて,破壊と飛散のシナリオを検討し,当時の風況を推定したものである。

著者

後藤 正夫 黄 奔立 牧野 孝宏 後藤 孝雄 稲葉 忠興

出版者

日本植物病理学会

雑誌

日本植物病理学会報 (ISSN:00319473)

巻号頁・発行日

vol.54, no.2, pp.189-197, 1988-04-25 (Released:2009-02-19)

参考文献数

40

被引用文献数

19 17

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静岡県,香川県および徳島県でチャ芽,野菜およびモクレンの花から分離した氷核活性細菌について分類学的研究を行った。1978~80年静岡県で, 1987年香川県でチャ芽から分離した氷核活性細菌は,後者の1菌株を除きすべてErwinia ananasと同定された。これに対し, 1986年および1987年の両年に静岡県で,また1987年に徳島県で分離された氷核活性細菌は前者の1菌株を除き,すべてXanthomonas属細菌であった。このxanthomonadは最高生育温度等2, 3の性質を除き,形態,生理・生化学的性質からX. campestrisと同定されたが,チャをはじめ供試した数種野菜には病原性を示さず,ジャガイモ切片をわずかに軟化したのみであった。この結果,本菌をX. campestrisの新亜種と位置づけるのが妥当と考えた。タイサイ等の緑葉野菜,チャ芽およびモクレンの花から分離した氷核活性pseudomonadはすべてPseudomonas syringaeと同じ細菌学的性質を示した。これらは分離した植物,野菜類,Delphinium spp. に病原性を示さなかったが,ライラックに対しては接種した菌株のすべてが病原性を示したことからP. syringae pv. syringaeと同定した。ワサビから分離したpseudomonadはP. cichoriiに類似した性質を示したが,蛍光色素非産生,非病原性等からこれとは異なる細菌と判定した。これらの氷核活性細菌は,いずれも高い氷核活性を示し,過冷却温度は-2.8~-3.0Cにあったが,ワサビ菌株は-4C~-5Cであった。

著者

林 愛明 宇田 進一

出版者

一般社団法人 日本地質学会

雑誌

地質学雑誌 (ISSN:00167630)

巻号頁・発行日

vol.103, no.7, pp.XXIII-XXIV, 1997 (Released:2010-12-14)

参考文献数

5

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テクタイトは地表に産する黒曜石に類似した天然のガラス質物質であり, 中国では, 紀元十世紀の唐の時代にすでに詳しく記載されており, “雷公墨”と名付けられている(李, 1963). テクタイトは, オーストラリア, 北米, 東南アジア, アフリカ北部, チェコスロバキアなどに分布している(Glass, 1990). テクタイトの成因については, 巨大隕石の衝突に伴い地表の岩石が熔融して形成されたという地球成因説(Glass, 1990)と, 月表面の火山物質(または宇宙物質)が隕石の衝突で飛散し, 地球に飛来したという月(または宇宙)成因説(O'keefe, 1976)などがあるが, いずれも成因を衝突熔融に求めている点では共通している. テクタイトの化学組成は地球物質起源のものが多いことから, 前者の説が有力になりつつある. 今回紹介する海南島のテクタイトの産地には, 不規則な割れ目の発達した砂岩中にシュードタキライトも発見されている(第10, 11図). この地点の周辺に明瞭な断層が存在していないことと隕石坑が存在していることから, このシュードタキライトはテクタイトとともに隕石衝突熔融によるものと考えられる.中国海南島に産するテクタイトは Hainanite と命名されている(李, 1963). そのフィッショントラック年代は約70万年であり, 東南アジアおよびオーストラリア産のテクタイトの年代とほぼ一致している(厳ほか, 1979). このテクタイトの産出層は海南島およびその周辺地域の第四系および古地形面の形成時代の鍵層として利用されている.