Search Results 1-20 of 75

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  • Theoretical study for uranium isotope fractionation caused by biotic reduction  [in Japanese]

    Abe Minori , Sato Ataru , Hada Masahiko

    <p>微生物によるウランの6価から4価への還元は、バイオレメディエーションや古生物学的観点から興味がもたれている。微生物による還元では、重い同位体がより多く4価の生成物に濃縮する一方、非生物による還元では同位体濃縮の傾向がさまざまである。本研究では、生物性還元の同位体分別メカニズムを解明するために、各素反応における相対論的ab initio法を用いた平衡論的同位体分別係数の理論計算を行 …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 67(0), 102, 2020

    J-STAGE 

  • Effect of herbicides on natural periphytic diatom communities and applicability of biotic metrics  [in Japanese]

    Nagai Takashi

    … <p>The effect of herbicides on attached diatom communities was investigated to understand the differences in species sensitivity and the applicability of diatom-based metrics. … as an indicator of the herbicide effect on the diatom community was less detectable. … Instead, a modified SPEAR index based on the present study would be a better indicator of the herbicide effect on the diatom community.</p> …

    Japanese Journal of Environmental Toxicology 23(2), 52-62, 2020

    J-STAGE 

  • Invention of Artificial Rice Field Soil: A Tool to Study the Effect of Soil Components on the Activity and Community of Microorganisms Involved in Anaerobic Organic Matter Decomposition

    Maeda Yu , Mise Kazumori , Iwasaki Wataru , Watanabe Akira , Asakawa Susumu , Asiloglu Rasit , Murase Jun

    … <p>Soils are characterized by diverse biotic and abiotic constituents, and this complexity hinders studies on the effects of individual soil components on microorganisms in soil. …

    Microbes and Environments 35(4), n/a, 2020

    J-STAGE 

  • Inter-annual variation of soil respiration and its spatial heterogeneity in a cool-temperate young larch plantation in northern Japan

    Lifei SUN , TAKAGI Kentaro , TERAMOTO Munemasa , HAYAKASHI Shintaro , Naishen LIANG

    … To understand the magnitudes of temporal variation in soil respiration (<i>R</i><SUB>s</SUB>) and its spatial heterogeneity, and the effect of abiotic and biotic factors to cause the variation in a young plantation recovering after the clear-cutting of a mature forest, we analyzed 8 year <i>R</i><SUB>s</SUB>, microclimate, and vegetation data obtained in a young hybrid larch plantation with dense undergrowth of dwarf bamboo <i>Sasa</i> …

    Journal of Agricultural Meteorology 76(3), 119-127, 2020

    J-STAGE 

  • Spatial distributions of seedlings and ground-surface environment in an even-aged sub-boreal coniferous forest with moss-type undergrowth in eastern Hokkaido, Japan  [in Japanese]

    Terazawa Kazuhiko , Suzuki Nanami , Inoue Subaru , Hoshina Yuki , Kobayashi Kana , Tanaka Kousuke , Sakai Kenichi

    <p>北海道東部の阿寒湖近傍の標高約700 mの緩斜面に成立する林齢約120年のトドマツを主とする天然生針葉樹同齢林において,コケ型の林床に生育する稚樹の空間分布と地表および表層土壌の環境の調査を行い,稚樹の局所密度と環境要因との関係を条件付き自己回帰(CAR)モデルを用いて解析した。調査区(32 m × 32 m)における当年生稚樹を除いた稚樹の本数密度は,トドマツが35,859 本 …

    Japanese Journal of Forest Environment 61(2), 85-94, 2019

    J-STAGE  JASI 

  • Cell cycle regulator, small silencing RNA, and segmentation patterning gene expression in relation to embryonic diapause in the band-legged ground cricket

    Shimizu Yuta , Tamai Takaaki , Goto Shin G.

    … Insects enter diapause to synchronize their life cycle with biotic and abiotic conditions favorable for their development, reproduction, and survival. …

    Insect Biochemistry and Molecular Biology (102), 75-83, 2018-11

    IR 

  • Activity of wild Japanese macaques in Yakushima revealed by camera trapping: Patterns with respect to season, daily period and rainfall

    Goro Hanya , Yosuke Otani , Shun Hongo , Takeaki Honda , Hiroki Okamura , Yuma Higo

    … Many biotic and abiotic factors change temporally, and climatic factors are particularly important because they directly affect the cost of thermoregulation. … The purpose of the present study was to determine the activity patterns of wild Japanese macaques (Macaca fuscata) with a special emphasis on the effect of thermal conditions. … Over the one-year period, temperature had a positive effect, and rainfall had a negative effect on the activity of macaques during the day. …

    PLOS ONE 13(1), 2018-01-02

    IR 

  • Breeding effort on hybrid larch F<sub>1</sub> and its responses to environmental stresses.  [in Japanese]

    Kita Kazuhito , Sugai Tetsuto , Fujita Saki , Koike Takayoshi

    <p>北海道の造林樹種として2代目造林が検討されるカラマツであるが、先枯れ病やネズミの食害に弱い弱点を克服したグイマツ雑種F<sub>1</sub>への期待も高まっている。特に、幹の通直性や材の強度に優れ、比重の高いクリーンラーチの安価な挿し木増殖法が開発され、コンテナ苗での苗木生産の目処も立った。一方、カラマツはタネの発芽率が低く、F<sub>1& …

    Forest Genetics and Tree Breeding 7(3), 107-114, 2018

    J-STAGE 

  • Theoretical study of isotope fractionation in uranium reduction  [in Japanese]

    Sato Ataru , Abe Minori , Hada Masahiko

    <p>バクテリア中の酵素が触媒する6価ウランの4価への還元では、4価ウランに重い同位体が分別するのに対し、非生物を触媒とした場合には、こうした分別が見られない。この事実を用いて、古代に堆積した地質中のウランの同位体比から、その時代の生物活動を理解する事が期待されている。しかし、ウラン還元における同位体分別のメカニズムは解明されていない。そこで本研究では、バクテリアによる生物性の還元に焦 …

    Abstracts of Annual Meeting of the Geochemical Society of Japan 65(0), 212, 2018

    J-STAGE 

  • Biotic resistance to an alien amphibian: Larval competition between Japanese frogs and invasive cane toads

    Haramura Takashi , Takeuchi Hirohiko , Crossland Michael R. , Shine Richard

    … We conducted laboratory trials to measure the effect of exposure to the larvae of Japanese frogs (Microhyla ornata, Fejervarya sakishimensis, Rhacophorus owstoni) on rates of survival, growth and development of cane toad tadpoles in Ishigaki Island, in southern Japan. …

    PLoS ONE 11(6), 2016-06-02

    IR 

  • Possibility of regeneration and ripple effect to biotic community after mass mortality of oak trees  [in Japanese]

    Saito Shoichi , Yagihashi Tsutomu , Takahashi Aya , Ueno Mitsuru , Shibata Mitsue , Nakashizuka Tohru

    ナラ枯れ激害林では,被害後に高木層が衰退し林冠疎開するため開空度が大きくなり,ナラ類や他の高木種が更新する可能性があると考えられた。激害林でも種子散布者のヒヨドリが生息していることから,被食型の樹木の種子も供給されると思われるが,林冠疎開による常緑低木やリョウブなどの低木層の繁茂によって,今後の高木種などの更新は困難であることも考えられる。激害林ではナラ枯れをきっかけと …

    Tohoku Journal of Forest Science 21(2), 60-65, 2016

    J-STAGE 

  • Perfusion culture of three-dimensional myoblast aggregation toward creation of biohybrid robot  [in Japanese]

    Sugihara Junji , Akiyama Yoshitake

    … <p>Recently, attention has been directed to the study on biohybrid robots utilizing biotic muscle tissue as an actuator. … We already proposed a three-dimensional cell assembly method using the Magneto-Archimedes effect and succeeded in bridging of myoblast aggregation between micropillars by the method. …

    Transactions of Japanese Society for Medical and Biological Engineering 54Annual(27PM-Abstract), S210-S210, 2016

    J-STAGE 

  • Characterization of Synthetic Hexaploids Derived from Same <i>Aegilops tauschii</i> Accessions and Different Durum Cultivars

    Gul Alvina , Rasheed Awais , Afzal Fakiha , Napar Abdul Aziz , Ali Ahmad , Jamil Muhammad , Khalid Maria , Bux Hadi , Mujeeb-Kazi Abdul

    … accession male parent crossed with different durum cultivars as the female parent (78 entries) is designed to study the inheritance of different genes and also to identify the effect of cytoplasmic inheritance, if any. … The total of 78 entries was screened against two biotic stresses (Karnal bunt and stripe rust), phenologically characterized and analyzed with SSRs for molecular characterization. …

    CYTOLOGIA 80(4), 427-440, 2015

    J-STAGE 

  • Effect of soil microorganisms on arsenite oxidation in paddy soils under oxic conditions

    Dong Dian Tao , Yamaguchi Noriko , Makino Tomoyuki , Amachi Seigo

    … The contribution of abiotic and biotic processes to the oxidation of arsenite [As(III)] when anaerobic paddy soils were shifted to oxic conditions was investigated. …

    Soil Science and Plant Nutrition 60(3), 377-383, 2014-05-04

    DOI 

  • Effects of biotic and abiotic factors on soil respiration in natural beech forest  [in Japanese]

    Lu Shuang , Katahata Shinitirou , Naramoto Masaaki , Mizunaga Hiromi , Wang Quan

    … Among them, contribution of abiotic and biotic factors remains unclear yet. … The sole direct positive effect of Dsim indicated biotic factor could be potentially applied for Rs estimation. … Future studies should include more biotic variables, e.g. vegetation property and enzyme dynamics, for elucidating soil flux response mechanisms to environmental change. …

    The Japanese Forest Society Congress 125(0), 365, 2014

    J-STAGE 

  • Comparative modeling of the effect of metal mixtures on algal growth using biotic ligand model, concentration additive, and independent action  [in Japanese]

    NAGAI Takashi , KAMO Masashi

    Biotic ligand model(BLM)was modified to predict metal mixture effect on algae based on the assumption that toxic mode of action is same among metals. … Furthermore, existing predictive models of mixture effect, concentration additive model and independent action model, were also used for predict metal mixture effect. …

    Japanese Journal of Environmental Toxicology 17(2), 57-68, 2014

    J-STAGE 

  • Formation of exclusive pattern during accumulation of ligno-suberic material in cell wall of Myrtaceae root tissues including epidermis, exodermis, endodermis and polyderm

    Tuladhar Astha , Ohtsuka Shizuki , Nii Naosuke

    … Discovery of this pattern, specific to Myrtaceae root polyderm, triggers more investigations on the effect of biotic and abiotic stress on biopolymer accumulation in it. …

    Plant Root 8(0), 24-32, 2014

    J-STAGE 

  • Sustainable Agricultural Development in Afghanistan

    Ahmad Sarhadi Wakil , Ahmad Fahim Samadi , Tangutan Kim

    … Agricultural education can have an important effect on the sustainable development of the agriculture sector. …

    Journal of Developments in Sustainable Agriculture 9(1), 41-46, 2014

    J-STAGE 

  • Regulation of reactive oxygen species actions via ascorbic acid metabolism  [in Japanese]

    Maruta Takanori

    … Reactive oxygen species (ROS) act not only as toxic compounds, but also as signaling molecules associated with responses to abiotic and biotic stresses in living organisms. … Thus, our findings revealed a central role of AsA metabolism for regulating the cytotoxic effect and the signaling function of ROS in plants. …

    VITAMINS 88(1), 1-10, 2014

    J-STAGE  Ichushi Web 

  • Microbial food web structure of the planktonic ecosystem in the neritic area of Sagami Bay, Japan : seasonal variability in chlorophyll a<20μm, bacteria, heterotrophic nanoflagellates and microzooplankton  [in Japanese]

    OKUTSU TAKESHI , ARA KOICHI , HIROMI JURO

    本州南部に位置し太平洋に面している相撲湾のうち,湾奥部の沿岸域(江の島沖)では,境川と引地川から高濃度の栄養塩類を含む河川水の流入負荷により,高栄養塩類濃度によって植物プランクトンの現存量(バイオマス)ならびに一次生産速度が同湾内の他海域よりも高レベルである。本研究では同湾沿岸域(江の島沖)における水柱(水深0~50m層)内でのバクテリア,従属栄養性ナノ鞭毛虫,マイクロ動物プランクトンの出現密度な …

    Bulletin of the Plankton Society of Japan 59(1), 1-19, 2012-02-26

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