Faculty Profiles - TAKAKURA Koichi

Papers - TAKAKURA Koichi

Division display61 - 80 of about 115／ All the affair displays >>

Occurrence of fluoroquinolones and fluoroquinolone-resistance genes in the aquatic environment Reviewed

444 508 - 514 2013.2

Two-Way but Asymmetrical Reproductive Interference between an Invasive Veronica Species and a Native Congener Reviewed

Koh-Ichi Takakura

American Journal of Plant Sciences 2013 ( 4 ) 535 - 542 2013

Dominant occurrence of cleistogamous flowers of Lamium amplexicaule in relation to the nearby presence of an alien congener L. purpureum (Lamiaceae) Reviewed

Yasuhiro Sato, Koh-Ichi Takakura, Sachiko Nishida, Takayoshi Nishida

ISRN Ecology 2013 Article ID 476862 - 6 2013

Language：English Publishing type：Research paper (scientific journal) Publisher：Hindawi Limited

Here we document a novel phenomenon that, based on field observations in central Japan, cleistogamous flowers (or closed flowers) of an annual herb <italic>Lamium amplexicaule</italic> were dominantly expressed near an alien congener <italic>L. purpureum</italic>. The proportion of cleistogamous flowers in an individual <italic>L. amplexicaule</italic> increased with the frequency of <italic>L. purpureum</italic> occurring in the same patches but did not increase with the total density of <italic>Lamium</italic> plants and their own size. To confirm the consistency of the effect of the coexisting alien species, we assessed the cleistogamous frequency at the patch level for three other populations. In these populations as well, the proportion of <italic>L. amplexicaule</italic> producing cleistogamous flowers increased with the frequency of <italic>L. purpureum</italic>. Our transplant experiment at one site found no effect of the nearby presence of <italic>L. purpureum</italic> on the seed set of <italic>L. amplexicaule</italic> and therefore did not support the hypothesis that the adverse effect on the reproduction via interspecific pollination favored cleistogamous flowers that accepted no external pollen. Further studies must be conducted to examine the negative interactions between the related species before and after seed development.

DOI： 10.1155/2013/476862

Other Link： http://downloads.hindawi.com/archive/2013/476862.xml

Bayesian estimation of population dynamics of feral cats in Osaka City, Japan Reviewed

Koh-Ichi Takakura, Takuto Abe, Kazuhide Doi, Shu-Ichi Sanada, Atsushi Hase

Japanese Journal of Environmental Entomology and Zoology in press ( 4 ) 133 - 141 2013

Safer DNA extraction from plant tissues using sucrose buffer and glass fiber filter Reviewed

Koh-Ichi Takakura, Takayuki Nishio

JOURNAL OF PLANT RESEARCH 125 ( 6 ) 805 - 807 2012.11

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER JAPAN KK

For some plant species, DNA extraction and downstream experiments are inhibited by various chemicals such as polysaccharides and polyphenols. This short communication proposed an organic-solvent free (except for ethanol) extraction method. This method consists of an initial washing step with STE buffer (0.25 M sucrose, 0.03 M Tris, 0.05 M EDTA), followed by DNA extraction using a piece of glass fiber filter. The advantages of this method are its safety and low cost. The purity of the DNA solution obtained using this method is not necessarily as high as that obtained using the STE/CTAB method, but it is sufficient for PCR experiments. These points were demonstrated empirically with two species, Japanese speedwell and common dandelion, for which DNA has proven difficult to amplify via PCR in past studies.

DOI： 10.1007/s10265-012-0502-x

Web of Science

Bayesian Estimation for the Effectiveness of Pesticides and Repellents Reviewed

K. I. Takakura

JOURNAL OF ECONOMIC ENTOMOLOGY 105 ( 5 ) 1856 - 1862 2012.10

Language：English Publishing type：Research paper (scientific journal) Publisher：ENTOMOLOGICAL SOC AMER

In the quantitative estimation of the effectiveness of pesticides and repellents, Abbott's correction and similar methods have been used for nearly a century. However, the formulas for such corrections have some disadvantages in performing range estimations and being used in batched experiments. These disadvantages also exist in the estimation of EC50, the chemical concentration that produces 50% mortality. In this study, I propose as a solution to these problems a Bayesian estimation with a logistic model. This method enables the flexible modeling of non-normal variables in complex experimental design, for example, life-death response in a batched experiment. Furthermore, if any knowledge about focal phenomena exists, it can be used in analyses as a prior distribution, thus enhancing the accuracy of the estimation.

DOI： 10.1603/EC11360

Web of Science

Increase of GII.2 norovirus infections during the 2009-2010 season in Osaka City, Japan Reviewed

84 ( 3 ) 517 - 525 2012.3

Differential effects of reproductive interference by an alien congener on native Taraxacum species Reviewed

Sachiko Nishida, Koh-Ichi Takakura, Takayoshi Nishida, Takashi Matsumoto, Masahiro M. Kanaoka

BIOLOGICAL INVASIONS 14 ( 2 ) 439 - 447 2012.2

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Reproductive interference (RI) has been suggested to play a critical role in native plant displacement by alien congeners. However, although co-existence of native and alien congeners may provide an opportunity to refute the RI hypothesis, few studies have examined such a case. Using a native Japanese dandelion, Taraxacum longeappendiculatum, and a co-existing alien congener, Taraxacum officinale, we tested the hypothesis that differences in RI by the alien between native recipient congeners explain whether a native will co-exist with or be displaced by an alien. We conducted a field survey to investigate the effects of alien relative abundance on T. longeappendiculatum seed set, and a hand-pollination experiment to identify the extent of pollen interference by the alien on T. longeappendiculatum. We compared these results with those obtained previously for another Japanese native species, Taraxacum japonicum, which was displaced by the alien. In our field survey, alien relative abundance had little effect on seed set in nearby T. longeappendiculatum, and hand-pollination with mixed pollen grains produced no substantial decrease in seed set of the native species. Model selection supported these tendencies; the effect of RI by the alien differed between the two native species. Other potential factors, such as resource competition or habitat changes, could not explain the co-existence of T. longeappendiculatum with and exclusion of T. japonicum by the alien in the same explanatory framework. Considering the consistent explanatory power, the findings suggest that RI is a critical mechanism that can determine both co-existence with and displacement of native dandelions by an alien congener.

DOI： 10.1007/s10530-011-0088-6

Web of Science

A simple criterion for distinguishing between sympatric fruit flies Bactrocera carambolae and B. papayae (Diptera: Tephritidae) notorious pests of diverse fruits on Java Reviewed

Hiroshi Kago, Hiroichi Sawada, Agus Susanto, Koh-ichi Takakura, Takayoshi Nishida, Morio Tsukada

Journal of Environmental Entomology and Zoology 23 ( 3 ) 143 - 149 2012

Analyses of the reproductive interference between native and invasive dandelions with individual based model(<Feature 2>Reproductive interference and ecological communities) Reviewed

Takakura Koh-Ichi, Matsumoto Takashi, Nishida Sachiko, Nishida Takayoshi

JAPANESE JOURNAL OF ECOLOGY 62 ( 2 ) 255 - 265 2012

No Reproductive Interference from an Alien to a Native Species in Cerastium (Caryophyllaceae) at the Stage of Seed Production Reviewed

Koh-Ichi Takakura

ISRN Botany 2012 ID 193807 2012

High Incidence of Human Echovirus Type 3 among Children in Osaka, Japan during the Summer of 2010 Reviewed

64 ( 6 ) 533 - 535 2011.11

Molecular Epidemiology of Human Rhinovirus C in Patients with Acute Respiratory Tract Infections in Osaka City, Japan Reviewed

64 ( 6 ) 488 - 492 2011.11

Improved method of plant DNA extraction using glass-fiber filter

Koh-ichi Takakura

Bunrui 11 ( 2 ) 139 - 149 2011.8

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Plant Systematics

In recent years, molecular biological analyses have been used in diverse areas of biology study. This wider use has increased demand for more convenient and safe methods of DNA extraction and purification. The author proposes an improved DNA extraction method using a glass-fiber filter. The improvements were mainly three. The first was centrifugation of homogenized plant tissue. The second was the addition of polyvinylpolypyrrolidone (PVPP) to the extraction reagent as a polyphenol absorbent. The final was the removal and collection of solvent from the glass fiber filter pieces using a desktop centrifuge. This improved method, which can extract sufficiently pure DNA solution for PCR amplification in diverse plant species, presents advantages over many conventional methods such as lower cost and higher safety, while accommodating a wider range of applications than the conventional glass fiber filter method can.

DOI： 10.18942/bunrui.KJ00007405277

CiNii Books

A tortricid moth of Cydia sp (Lepidoptera: Tortricidae) boring into thorns of Gleditsia japonica Miq. (Fabaceae) in Japan

14 ( 2 ) 179 - 181 2011.6

A tortricid moth of Cydia sp. (Lepidoptera: Tortricidae) boring into thorns of Gleditsia japonica Miq. (Fabaceae) in Japan Reviewed

14 ( 2 ) 179 - 181 2011.6

Effective range of reproductive interference exerted by an alien dandelion, Taraxacum officinale, on a native congener

124 ( 2 ) 269 - 276 2011.3

Alien Dandelions Displace a Native Related Species Through Interspecific Pollen Transfer Reviewed

83 - + 2011

イヌノフグリの“多型”－石垣環境への適応と種子散布者との関係－

高倉耕一, 西田佐知子, 西田隆義

日本生態学会関東地区会会報 59 19 - 25 2011

大阪市域における特定外来生物の分布:インターネット上の情報活用の可能性と課題

高倉耕一

大阪市立環境科学研究所報告調査研究年報 73 65 - 73 2011

　 PREV - NEXT 　

<TAKAKURA Koichi>

Papers - TAKAKURA Koichi