Hazardous Chemicals in Plastics in Marine Environments : International Pellet Watch
Yamashita, Rei ; Tanaka, Kosuke ; Yeo, Bee Geok ; Takada, Hideshige ; Franeker, Jan A. van; Dalton, Megan ; Dale, Eric - \ 2019
In: Hazardous Chemicals Associated with Plastics in the Marine Environment Springer Verlag (Handbook of Environmental Chemistry ) - ISBN 9783319955667 - p. 163 - 183.
Additives - Equilibrium - Open ocean - Pellets - Sorption
Marine plastic debris, including microplastics <5Â mm, contain additives as well as hydrophobic chemicals sorbed from surrounding seawater. A volunteer-based global monitoring programme entitled International Pellet Watch (IPW) is utilizing the sorptive nature of plastics, more specifically of beached polyethylene (PE) pellets, in order to measure persistent organic pollutants (POPs) throughout the world. Spatial patterns of polychlorinated biphenyls (PCBs) and organochlorine pesticides have been revealed. Original data of IPW show large piece-to-piece variability in PCB concentrations in pellets collected at each location. This is explained by the combination of slow sorption/desorption and large variabilities of speed and route of floating plastics. The sporadically high concentrations of POPs, both sorbed chemicals and hydrophobic additives, are frequently observed in pellets and the other microplastics in open ocean and remote islands. This poses a chemical threat to marine ecosystems in remote areas.
Complete genome sequences of two highly divergent Japanese isolates of Plantago asiatica mosaic virus
Komatsu, Ken ; Yamashita, Kazuo ; Sugawara, Kota ; Verbeek, Martin ; Fujita, Naoko ; Hanada, Kaoru ; Uehara-Ichiki, Tamaki ; Fuji, Shin Ichi - \ 2017
Archives of Virology 162 (2017)2. - ISSN 0304-8608 - p. 581 - 584.
Plantago asiatica mosaic virus (PlAMV) is a member of the genus Potexvirus and has an exceptionally wide host range. It causes severe damage to lilies. Here we report on the complete nucleotide sequences of two new Japanese PlAMV isolates, one from the eudicot weed Viola grypoceras (PlAMV-Vi), and the other from the eudicot shrub Nandina domestica Thunb. (PlAMV-NJ). Their genomes contain five open reading frames (ORFs), which is characteristic of potexviruses. Surprisingly, the isolates showed only 76.0–78.0 % sequence identity with each other and with other PlAMV isolates, including isolates from Japanese lily and American nandina. Amino acid alignments of the replicase coding region encoded by ORF1 showed that the regions between the methyltransferase and helicase domains were less conserved than other regions, with several insertions and/or deletions. Phylogenetic analyses of the full-length nucleotide sequences revealed a moderate correlation between phylogenetic clustering and the original host plants of the PlAMV isolates. This study revealed the presence of two highly divergent PlAMV isolates in Japan.
Conversion of chromosome-specific RAPDs into SCAR-based anchor markers for onion linkage maps and its application to genetic analyses inother Allium species
Masuzaki, S. ; Miyazaki, T. ; McCallum, J. ; Heusden, A.W. van; Kik, C. ; Yamashita, K. ; Tashiro, Y. - \ 2008
Scientia Horticulturae 115 (2008)4. - ISSN 0304-4238 - p. 323 - 328.
amplified polymorphic dna - monosomic addition lines - l. aggregatum group - cepa l. - construction - assignment - sequences - aflp - locations - reveals
Integration of previously developed Allium cepa linkage maps requires the availability of anchor markers for each of the eight chromosomes of shallot (A. cepa L. common group Aggregatum). To this end, eight RAPD markers originating from our previous research were converted into SCAR markers via cloning and sequencing of RAPD amplicons and designing of 24-mer oligonucleotide primers. Of the eight pairs of SCAR primers, seven resulted in the amplification of single bands of the original RAPDs, and the remaining primer set amplified an additional band. The results of Southern hybridization using RAPD amplicons from genomic DNA of Japanese bunching onion (Allium fistulosum L.)¿shallot monosomic addition lines indicated that five SCAR markers were single shallot chromosome-specific markers and were not detected in genomic DNA of A. fistulosum. The eight SCAR primer pairs were applied to other Allium species and exhibited three types of amplification profiles, namely RAPD amplicons observed only in shallot, in shallot and Allium vavilovii, and in several Allium species. A mapping study using 65 F2 plants generated by the selfing of one interspecific cross A. cepa × Allium roylei individual integrated the SCAR marker SAOE17500 into chromosome 5 as expected. The results of the present study show that the eight SCAR primer sets specific to shallot can facilitate the mapping in A. cepa and can also serve as anchor points between maps of different Allium species
|Testicular development induced by a recessive mutation during gonadal differentiation of female common carp (Cyprinus carpio, L.).
Komen, J. ; Yamashita, M. ; Nagahama, Y. - \ 1992
Development, growth and differentiation 34 (1992). - ISSN 0012-1592 - p. 535 - 544.
|Effects of a juvenile hormone analogue on development metamorphosis and diapause induction of the colorado potato beetle.
Kort, C.A.D. de; Koopmanschap, A.B. - \ 1990
In: Advances in invertebrate reproduction 5 / Hoshi, M., Yamashita, O., Amsterdam : Elsevier Sci. Publ - p. 383 - 386.