文献ランキング(各10件)

著者
山室 真澄 鑪迫 典久
出版者
東京大学
雑誌
挑戦的研究(萌芽)
巻号頁・発行日
2017-06-30

市販の柔軟剤4製品を最適化した方法で分析した。各社ともほぼ同じ香料を組み合わせて使用していた。同じ方法で千葉県の人工河川の河川水を使って分析したところ、標準試薬にある12成分のうち10成分の人工香料が検出された。このことから、最適化した方法で環境水中の香料成分を検出できることが分かった。環境水にマイクロカプセルの形で拡散している場合、環境水を濾過して懸濁物を接触する二枚貝がマイクロカプセルを取り込んでいる可能性がある。そこで西日本の汽水湖沼および首都圏の感潮河川で漁獲されたヤマトシジミを提供いただき分析したところ、柔軟剤から検出された香り成分と似た組み合わせで人工香料が検出された。

26 16 16 16 OA アイヌ物語

著者
武隈徳三郎 著
出版者
富貴堂書房
巻号頁・発行日
1918
著者
安永 遼真 熊谷 雄介 道本 龍
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会全国大会論文集 第36回 (2022)
巻号頁・発行日
pp.2P4GS1002, 2022 (Released:2022-07-11)

マーケティング・サイエンスは,科学的な手法を用いてマー ケティングにおける意思決定の質を向上させる取り組みである.マーケティング・サイエンスは,個人単位のデータ(個票) に対する分析と,個票を集計したデータに対する分析とに大別できるが,近年は個票データを用いた手法が特に盛んに研究されてきた.しかし,プライバシー保護の潮流や技術規制に伴い,個票データの収集や分析に対する障壁が高くなりつつある.そのため,集計データのみからマーケティング活動に対する示唆を得られるMarketing Mix Modeling (MMM) に注目が集まっている.MMMは,広告の投対効果を把握し,予算配分を最適化するために用いられる市場反応分析手法の一種である.MMMは1960 年代に提案された問題設定だが,これまで産業界では調査会社や広告会社が独自に構築・提供しており,詳細な技術仕様は各社の独自ノウハウとなっていた.しかし,近年,産業界から論文やオープンソースの実装が多数公開され,新たな潮流が生まれつつある.本論文ではこれをMMMの「再発見」と捉え,その経緯と研究動向,課題について論じる.
著者
吉村 寿人 飯田 敏行
出版者
THE PHYSIOLOGICAL SOCIETY OF JAPAN
雑誌
The Japanese Journal of Physiology (ISSN:0021521X)
巻号頁・発行日
vol.2, pp.177-185, 1951 (Released:2011-06-07)
参考文献数
10
被引用文献数
24 30

Factors governing individual differences of temperature reaction to cold found by Lewis were studied by estimating reaction index devised in the first part of this study. Main results obtained are as follows:1. The reaction was found even a few days after birth and developed rapidly with lapse of days. The high reactivity in childhood was lessened in puberty and again it rose in young adult, after which it decreased gradually with the progress of age.2. A female adult seemed to show a little lower reactivity than a male.3. Native countries and racial specificity were proved to have an intimate relation with the reactivity, and a main factor of the influences was deduced to be the effect of training to cold.4. The Orochons were found to have the highest reactivity among all nations in Manchuria, and thus protecting themselves from frost-bite, adapted to their nomadic life in a cold country. The reactivity of Japanese adults recently came to Manchuria was the lowest of all the natives, while that of Japanese children was about the same with those of the native (the Mongols and the Chinese) children.5. A validity of training effect reported by Takahashi was ascertained, and it was proved that the effect was more remarkable on the youth than on the adult.6. Subjects of low reactivity were proved to show frequently high sympathetic tonus. Thus the tonus of autonomic nervous system had an intimate bearing with the reactivity.7. Main internal factors causing individual differences of the reaction were presumed to be differences of the following three: the morphological constitution, especially of blood vessels, the nervous control (activities) and other physiological properties of the skin. The experimental results mentioned above were explained from this point of view.
著者
吉村 寿人 飯田 敏行
出版者
THE PHYSIOLOGICAL SOCIETY OF JAPAN
雑誌
The Japanese Journal of Physiology (ISSN:0021521X)
巻号頁・発行日
vol.2, pp.177-185, 1951 (Released:2011-06-07)
参考文献数
10
被引用文献数
24 30

Factors governing individual differences of temperature reaction to cold found by Lewis were studied by estimating reaction index devised in the first part of this study. Main results obtained are as follows:1. The reaction was found even a few days after birth and developed rapidly with lapse of days. The high reactivity in childhood was lessened in puberty and again it rose in young adult, after which it decreased gradually with the progress of age.2. A female adult seemed to show a little lower reactivity than a male.3. Native countries and racial specificity were proved to have an intimate relation with the reactivity, and a main factor of the influences was deduced to be the effect of training to cold.4. The Orochons were found to have the highest reactivity among all nations in Manchuria, and thus protecting themselves from frost-bite, adapted to their nomadic life in a cold country. The reactivity of Japanese adults recently came to Manchuria was the lowest of all the natives, while that of Japanese children was about the same with those of the native (the Mongols and the Chinese) children.5. A validity of training effect reported by Takahashi was ascertained, and it was proved that the effect was more remarkable on the youth than on the adult.6. Subjects of low reactivity were proved to show frequently high sympathetic tonus. Thus the tonus of autonomic nervous system had an intimate bearing with the reactivity.7. Main internal factors causing individual differences of the reaction were presumed to be differences of the following three: the morphological constitution, especially of blood vessels, the nervous control (activities) and other physiological properties of the skin. The experimental results mentioned above were explained from this point of view.
著者
Yuko OCHIAI Yasumasa OTSUKA
出版者
National Institute of Occupational Safety and Health
雑誌
Industrial Health (ISSN:00198366)
巻号頁・発行日
vol.60, no.5, pp.436-446, 2021-11-25 (Released:2022-10-01)
被引用文献数
1

Although an increasing number of studies on psychological safety at workplaces has been conducted in both western and eastern countries, there are few empirically validated measures in Japan. Our purpose was to investigate the validity and reliability of the Japanese version of the Psychological Safety Scale. Japanese workers were invited to participate in online surveys at baseline and at one-month follow-up (N=320). The Psychological Safety Scale was translated into Japanese according to international guidelines. Social support at workplace, work engagement, organization-based self-esteem, organizational justice, and job satisfaction were measured. Cronbach’s alphas and intra-class correlation coefficient (ICC) were examined for reliability, and its validity was tested by confirmatory factor analysis and correlational analyses. The results of the survey showed that respondents were 287 at baseline and 236 at follow-up. Cronbach’s alphas of the Psychological Safety Scale were 0.91 (baseline) and 0.88 (follow-up), and ICC was 0.87. Confirmatory factor analysis demonstrated a marginally acceptable fit. Overall, the Japanese Psychological Safety Scale had moderate to strong correlations with other scales. In conclusion, the Japanese version of the Psychological Safety Scale had acceptable levels of reliability and validity, and may be applicable for use in Japanese workers.
著者
安永 遼真 熊谷 雄介 道本 龍
出版者
一般社団法人 人工知能学会
雑誌
人工知能学会全国大会論文集 第36回 (2022)
巻号頁・発行日
pp.2P4GS1002, 2022 (Released:2022-07-11)

マーケティング・サイエンスは,科学的な手法を用いてマー ケティングにおける意思決定の質を向上させる取り組みである.マーケティング・サイエンスは,個人単位のデータ(個票) に対する分析と,個票を集計したデータに対する分析とに大別できるが,近年は個票データを用いた手法が特に盛んに研究されてきた.しかし,プライバシー保護の潮流や技術規制に伴い,個票データの収集や分析に対する障壁が高くなりつつある.そのため,集計データのみからマーケティング活動に対する示唆を得られるMarketing Mix Modeling (MMM) に注目が集まっている.MMMは,広告の投対効果を把握し,予算配分を最適化するために用いられる市場反応分析手法の一種である.MMMは1960 年代に提案された問題設定だが,これまで産業界では調査会社や広告会社が独自に構築・提供しており,詳細な技術仕様は各社の独自ノウハウとなっていた.しかし,近年,産業界から論文やオープンソースの実装が多数公開され,新たな潮流が生まれつつある.本論文ではこれをMMMの「再発見」と捉え,その経緯と研究動向,課題について論じる.
著者
山野 良一
出版者
沖縄大学人文学部
雑誌
沖縄大学人文学部紀要 = Journal of the Faculty of Humanities and Social Sciences (ISSN:13458523)
巻号頁・発行日
no.24, pp.117-123, 2021-03-31

乳幼児を持つ世帯の保育利用および共働き割合の所得格差について、国民生活基礎調査の2 次データを活用し分析を行った。1998 年、2007 年、2016 年の3 年間の継時分析とし、乳幼児全体と3 歳未満児のいる世帯で分析した。結果として、かつて見られていた、低所得層と高所得層が中所得層と比べ、高い割合で保育を利用するというU 字型の傾向は、乳幼児全体でも3 歳未満児でもすでに見られなくなっていた。また、共働きの割合は、増加の割合に階層差が見られ、特に3 歳未満児では、低所得層が中高所得層に比べ、増加傾向が低いことが推察できた。3 歳未満児では、共働きの傾向と経済状況との間には、右肩上がりの直線的な関係が生じ、低所得層では共働きをする割合が中高所得層に比べ相対的に低くなっているという可能性を示唆していた。
著者
佐々木 恵理
出版者
現代日本語研究会
雑誌
ことば (ISSN:03894878)
巻号頁・発行日
vol.39, pp.17-35, 2018-12-31 (Released:2018-12-31)
参考文献数
20

女性への性暴力への抗議と性被害を告発する「#MeToo」運動をきっかけとして、日本でもセクシュアルハラスメント(セクハラ)の議論が活発になっている。報道の姿勢や世論の反応から、セクシュアルハラスメントは重大な人権侵害であるという認識が浸透していることがわかる。一方、セクシュアルハラスメントが正しく理解されているとは言いがたい状況もある。セクシュアルハラスメントは、職場や労働の場で権力関係を背景に起きると定義されるが、日常で起きる性暴力や性被害を「セクハラ」と表現したり、性的な発言や身体接触の様子を象徴的に「セクハラ」と描写したり、ふざけたりからかったりする意図で「セクハラ」が使われたりしている。本論では、まずセクシュアルハラスメントの定義を確認し、次に、さまざまな場面での誤用・誤解例を示す。さらに、こうしたことばの混乱が起きた源泉を探り、セクシュアルハラスメントの問題解決のためのよりよい表現を考えたい。
著者
Hideki Kakeya Yoshihisa Matsumoto
出版者
Information Processing Society of Japan
雑誌
IPSJ Transactions on Bioinformatics (ISSN:18826679)
巻号頁・発行日
vol.15, pp.22-29, 2022 (Released:2022-11-16)
参考文献数
35

A method to find a probability that a given bias of mutations occur naturally is proposed to test whether a newly detected virus is a product of natural evolution or a product of non-natural process such as genetic manipulation. The probability is calculated based on the neutral theory of molecular evolution and binominal distribution of non-synonymous (N) and synonymous (S) mutations. Though most of the conventional analyses, including dN/dS analysis, assume that any kinds of point mutations from a nucleotide to another nucleotide occurs with the same probability, the proposed model takes into account the bias in mutations, where the equilibrium of mutations is considered to estimate the probability of each mutation. The proposed method is applied to evaluate whether the Omicron variant strain of SARS-CoV-2, whose spike protein includes 29 N mutations and only one S mutation, can emerge through natural evolution. The result of binomial test based on the proposed model shows that the bias of N/S mutations in the Omicron spike can occur with a probability of 2.0 × 10-3 or less. Even with the conventional model where the probabilities of any kinds of mutations are all equal, the strong N/S mutation bias in the Omicron spike can occur with a probability of 3.7 × 10-3, which means that the Omicron variant is highly likely a product of non-natural process including artifact.
著者
太田 美奈子
出版者
日本メディア学会
雑誌
マス・コミュニケーション研究 (ISSN:13411306)
巻号頁・発行日
vol.92, pp.165-182, 2018-01-31 (Released:2018-05-10)
参考文献数
25

This paper examines the reception of early television in rural Japan throughSai village in the Aomori prefecture. While the first television station in Aomoriwas founded in 1959, most Aomori residents had previously accessed the televisionsignal from NHK Hakodate( Hokkaido), established in 1957. The small fishingvillage, Sai village, had the highest television penetration rate in Aomori atthat time and was known as a ‘TV village’. Why did the people of Sai villagewant television? What effect did this desire have? This paper aims to answerthese questions by tracing the evolution from the first arrival of television inSai village in 1957 to the wide spread availability of television in Aomori in1959. Interviews and archival documents show that educational motivations, andspecifically the desire to show the outside world to the children, were fundamental to their choices. Through television education in school, the children’seducation flourished and developed into television reception that went beyondeducational purposes. Matsunoyama village in Niigata prefecture also had asimilar television reception as Sai village. Sai village represents a key point ofreference for television reception in rural Japan in that its remoteness preservedtelevision’s function as an educational visual aid. This paper goes beyondthe urban-centred narratives about early television reception by accounting forthe fact that villagers saw a potential for television beyond leisure in education,and by exploring how the affirmation of television as leisure also opened upchildren to outside worlds. The children’s reactions were in line with a McLuhan-esque view of televisionand what happened in Sai village points to the key potentials of television.This paper shows how rural areas had a rich television reception during theearly days of television. In addition, this paper represents the first stepstowards understanding an era in which television reception forms were stillmixed.
著者
齋藤 雅史 伊藤 毅志
雑誌
ゲームプログラミングワークショップ2022論文集
巻号頁・発行日
vol.2022, pp.159-166, 2022-11-04

現在,将棋AI はプロ棋士をはるかに凌駕するレベルにある.それに伴って,近年ではプロ棋士が将棋AI を用いた将棋研究を行うことが普通になってきた.こうした背景から,将棋AI が近年のプロ棋士の棋譜に大きな影響を与えていると言われているが,実際にどのような影響が生じているのかについて,定量的分析を行った研究はまだ少ない.そこで,本研究では将棋AI を用いて近年のプロ棋士の棋譜に現れる変化を定量的に分析した.その結果,強い将棋AI が普及し始めた2017 年前後において,プロ棋士の棋譜は将棋AI との一致率が有意に高くなることが示された.また,平均損失を調べたところ,序盤(40 手目まで)では平均損失の上昇が見られたが,中盤以降(41 手目以降)ではA 級棋士以外上昇が認められなかった。
著者
Hiroaki Kawano Tetsufumi Motokawa Hirokazu Kurohama Shinji Okano Ryohei Akashi Tsuyoshi Yonekura Satoshi Ikeda Koichi Izumikawa Koji Maemura
出版者
The Japanese Society of Internal Medicine
雑誌
Internal Medicine (ISSN:09182918)
巻号頁・発行日
vol.61, no.15, pp.2319-2325, 2022-08-01 (Released:2022-08-01)
参考文献数
27
被引用文献数
1

A 60-year-old Japanese woman was hospitalized for cardiogenic shock 24 days after receiving the second dose of the coronavirus disease 2019 BNT162b2 vaccine. Impella CP left ventricular assist device implantation and venoarterial peripheral extracorporeal membranous oxygenation were immediately initiated along with inotropic support and steroid pulse therapy, as an endomyocardial biopsy specimen showed myocarditis. Three weeks later, her cardiac function had recovered, and she was discharged. An immune response associated with the presence of spike protein in cardiac myocytes may be related to myocarditis in the present case because of positive immunostaining for severe acute respiratory syndrome coronavirus 2 spike protein and C4d in the myocardium.
著者
高田 知紀 梅津 喜美夫 桑子 敏雄
出版者
公益社団法人 土木学会
雑誌
土木学会論文集F6(安全問題) (ISSN:21856621)
巻号頁・発行日
vol.68, no.2, pp.I_167-I_174, 2012 (Released:2013-01-30)
参考文献数
32
被引用文献数
1 8 5

東日本大震災では,多くの神社が津波被害を免れたことが指摘されている.本研究では,日本の神社に祀られる祭神の多様性は,人びとの関心に応じた差異化の結果であるという仮説から,宮城県沿岸部の神社についてその祭神と空間的配置に着目しながら被害調査を行った.祭神については特に,ヤマタノオロチ退治で知られるスサノオノミコトに着目した.スサノオは無病息災の神として祀られることから,洪水や津波といった自然災害時にも大きな役割を果たすと考えられる.また,地域の治水上の要所に鎮座していることが多い.東北での調査から,スサノオを祀った神社,またスサノオがルーツであると考えられる熊野神社は,そのほとんどが津波被害を免れていることを明らかにした.この結果は,地域の歴史や文化をふまえたリスク・マネジメントのあり方について重要な知見を提供する.
著者
嵩原 広宙 田中 秀樹 岩城 達也
出版者
Japan Society of Kansei Engineering
雑誌
日本感性工学会論文誌 (ISSN:18840833)
巻号頁・発行日
pp.TJSKE-D-17-00030, (Released:2018-02-09)
参考文献数
22

Emotional state before sleep affects the subsequent sleep onset. The purpose of this study was to investigate how positive/negative emotion before sleep effected hypnagogic state. The movies eliciting positive or negative emotion were presented before sleep. Hypnagogic imagery was recorded as a probe of emotional experience and EEG microstate analysis was used for finding the emotion related EEG activities. The score of emotion ratings for hypnagogic imagery indicated that positive emotion was reported in not only positive condition but also in negative condition. This implied that hypnagogic state might be accompanied by positive emotion. Comparing the appearance of maps obtained from microstate analysis between conditions, the map of right temporal activity was significantly greater in positive condition while the map of the left frontal activity was greater negative condition. These results suggested that the emotion not just in presleep but also in hypnagogic state was involved in sleep onset process.
著者
武田 宗和 名取 恵子 諸井 隆一 原田 知幸 矢口 有乃 稲垣 伸洋
出版者
日本腹部救急医学会
雑誌
日本腹部救急医学会雑誌 (ISSN:13402242)
巻号頁・発行日
vol.33, no.4, pp.735-739, 2013-05-31 (Released:2013-07-26)
参考文献数
10

要旨:【症例】37歳飲酒歴のない女性。意識障害で発見され救急搬送,既往は躁鬱病と境界型人格障害。来院時ショック状態で下血を認め,緊急下部内視鏡検査で直腸から左側結腸まで全周性・連続性の発赤とびらんを認めた。翌日,薄めたウオッカ約1L(推定アルコール濃度49%)を自ら注腸したことが判明,虚血性腸炎に準じ保存的治療を選択。8病日の内視鏡検査では直腸からS状結腸までは粘膜の修復が認められ保存的治療を継続した。4週間後,下行結腸の高度な腸管狭窄を合併したため,本人との話し合いの結果,横行結腸に人工肛門を造設することとなった。【考察】過去の報告では,アルコール注入による直腸結腸炎は保存的治療で治癒することが多いとされる。本例は高濃度のアルコールが大量に注入され広範囲に腸管が傷害された上にショック状態に陥り,腸管虚血をきたしその治癒過程で腸管狭窄を合併したものと推察された。本例における治療方針に関する問題点をふまえ文献的考察を加え報告する。
著者
近江 龍一 西原 陽子 山西 良典
出版者
人工知能学会
雑誌
人工知能学会全国大会論文集 (ISSN:13479881)
巻号頁・発行日
vol.31, 2017

Web上に投稿される情報の中には青少年にとって有害な情報,特に猥褻な意味を持つ言葉は直接記述されず暗喩により表現されることが多い.本研究の目的は暗喩を用いて表現されている有害な文に対してフィルタリングを行うことである.提案手法では有害表現が含まれる文をドメインごとに機械学習し有害表現の分類器を作り,有害表現をフィルタリングする.提案手法の有用性を評価する実験をR-18指定の小説を使い行った.
著者
酒向 貴子 川田 伸一郎 手塚 牧人 上杉 哲郎 明仁
出版者
国立科学博物館
雑誌
Bulletin of the National Museum of Nature and Science. Series A, Zoology = 国立科学博物館研究報告. A類, 動物学 (ISSN:18819052)
巻号頁・発行日
vol.34, no.2, pp.63-75, 2008-06

The distribution of latrines of the raccoon dog, Nyctereutes procyonoides, was examined from July 2006 to December 2007 in the Imperial Palace grounds, Tokyo, Japan. The raccoon dog is accustomed to defecate at fixed locations, forming holding latrines; thus the distribution of latrines is a good indicator of their abundance. The results suggest that the latrines are widely scattered in the study site, but are more dense in the Fukiage area, where an old-growth broad-leaved forest is established. The latrine sites are used more frequently from September to December, as the number of fresh feces increased in the autumnal season. To examine the seasonal food changes of the raccoon dogs, 10 pieces of feces from some latrines were collected every month and analyzed the indigestible contents in the sampled feces. The food items identified consisted of animal, plant and man-made materials, suggesting that the raccoon dogs were highly omnivorous. The animal materials found from the feces included mammals (4% of total feces), birds (37%), reptiles (2%), amphibians (3%), insects (95%), chilopods (56%), isopods (2%) and gastropods (12%). Invertebrates were the most abundand food item throughout the year. Three coleopteran families, the Carabidae, Staphylinidae and Scarabaeidae, accounted for a large proportion of the insects and they showed seasonal fluctuations. These suggest that the raccoon dogs fed on them as major animal food resources in the study site, and perhaps the seasonality is related to the temporal changes of availability of the insects. The majority of plant materials found in the feces was a variety of seeds, suggesting that the raccoon dogs fed on berries and fleshy fruits throughout the year. The occurrence of seeds decreased from March to April, which coincided with a low availability of fruits. The seeds found in feces were categorized into three types : (1) the short-term berry type including Prunus (Cerasus) spp., Moms spp., Rubus hirsutus and Machilus thunbergii, which occurred only a short term after their fruiting periods ; (2) the long-term berry type, including Celtis sinensis, Aphananthe aspera and Swida controversa, which occurred continuously for three or more months after the fruiting periods ; (3) the acorn type, including Castanopsis spp., Quercus spp. and Ginkgo biloba, which occurred in early spring (January to April) when the other fruits are scarce. The seasonal change of the three fruit types implies that the raccoon dogs consume the available fruits in relation to the successive fruiting periods. The proportion of artificial materials found in the feces was considerably lower than in previous studies carried out in the suburbs of Tokyo, suggesting that the raccoon dogs in the study site strongly depend on natural foods. Most of the natural food items were native to Japan since the past Edo period. Thus we conclude that the preservation of biodiversity in the Imperial Palace grounds was essential for the re-colonization by the raccoon dogs of the Tokyo metropolitan area after the 1970s.
著者
松阪 崇久
出版者
日本笑い学会
雑誌
笑い学研究 (ISSN:21894132)
巻号頁・発行日
vol.25, pp.90-106, 2018 (Released:2018-12-27)

動物ショーやテレビ番組に出演するチンパンジー・パンくんの映像作品を用いて、パンくんの感情表出についての分析を行った。映像作品でのパンくんは、着衣で二足歩行を行うことが多く、自然なチンパンジーの姿とは大きく異なっていた。テレビ番組用の映像と動物ショーの本番の映像では、それ以外の動物園などでの映像と比べて、チンパンジー本来の姿とのズレが大きく、感情表出に関しては、ポジティブな笑顔や笑いの表出よりも、恐怖・不安・不満といったネガティブな表出が多い傾向があった。とくにテレビ番組では、パンくんに試練を課し、不安やストレスを与えるシーンもしばしば見られた。このようなパンくん自身の感情表出以外に、テロップ、ナレーションや、チンパンジーの音声の追加によって、パンくんの感情を演出または改変する場面もあった。以上の結果を元に、ショーやテレビにチンパンジーが出演することの問題点について議論した。また、動物の福祉を考える上で、笑いや遊びに注目する意義について考察した。
著者
板屋 民子 飯島 正雄 斉藤 貢一 正木 宏幸 青木 敦子 斎藤 章暢 安藤 佳代子 徳丸 雅一 坂東 正明
出版者
Japanese Society of Food Microbiology
雑誌
食品と微生物 (ISSN:09108637)
巻号頁・発行日
vol.8, no.4, pp.203-212, 1992-03-20 (Released:2010-07-12)
参考文献数
10

A large number of Photobacterium phosphoreum (6-7 log/g) was isolated from “tamagoyaki” (a kind of nigirisushi; Japanese food) that had been lumineferous in the dark. The isolates were smeared on the surfaces of sliced “tamagoyakis”. After the incubation at 10°C for 48 hr or at 25°C for 24 hr, the surfaces became luminous. It was indicated that this abnormality of “tamagoyaki” was caused by contamination with and multiplication by P. phosphoreum.On the surface of “tamagoyaki”, the bacteria in an early growth phase in such a small number as 4 log/g luminesced. Furthermore, the luminescence was observed when pieces of squid, boiled prawn or “yakichikuwa” (a kind of food made of fishes) with the bacteria were incubated, but not observed on pickled Japanese gizzard shad. Nevertheless the the bacteria grew on the surface of tuna, but no luminescence was observed on it.The bacteria produced a small amount of histamine on squid and tuna (less than 250μg/g), and their ability to putrefy food seemed to be low.The opitmum concentration of sodium chloride for growth of the bacteria in a medium was 3%, but they grew in food containing sodium chloride less than 0.5%. When sodium chloride in the medium was replaced by potassium chloride, calcium chloride, magnesium chloride, ammonium chloride or sodium phosphate, the bacteria were still able to grow but unable to grow when replaced by potassium phosphate or sucrose. The bacteria metabolized arginine by arginine decarboxylase but not by arginine dehydrolase.

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