11 research outputs found

    Possibility of position estimates for bottom-dwelling aquatic animals in a small area using ultrasonic coded transmitters and passive monitoring receivers

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    December 13-14, 2006, Siam City Hotel, Bangkok, ThailandThe objective of this study is to examine the possibility of position estimates for bottom-dwelling aquatic animals utilizing small areas by the use of ultrasonic coded transmitters and passive monitoring receivers. We measured the relationship between the rate of signal receptions and the distance from each receiver by deploying ten ultrasonic coded transmitters near the bottom in an array of six receivers in a small area (100 x 250 m). We then tested the weighted means analysis and a multiple regression analysis for estimating the transmitter positions. The relationship between the rate of signal receptions and the distance from each receiver were not always linear, probably because of bottom topography, and there were relatively large errors in both analyses. Therefore, for bottom dwelling aquatic animals utilizing a small area, it is better to make detailed three dimensional maps of reception rates and positions of transmitters in order to estimate finer-scale positions of ultrasonically-tagged animals using ultrasonic coded transmitters and passive monitoring receivers

    The map-based sequence of the rice genome

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    Rice, one of the world's most important food plants, has important syntenic relationships with the other cereal species and is a model plant for the grasses. Here we present a map-based, finished quality sequence that covers 95% of the 389Mb genome, including virtually all of the euchromatin and two complete centromeres. A total of 37,544 nontransposable- element-related protein-coding genes were identified, of which 71% had a putative homologue in Arabidopsis. In a reciprocal analysis, 90% of the Arabidopsis proteins had a putative homologue in the predicted rice proteome. Twenty-nine per cent of the 37,544 predicted genes appear in clustered gene families. The number and classes of transposable elements found in the rice genome are consistent with the expansion of syntenic regions in the maize and sorghum genomes. We find evidence for widespread and recurrent gene transfer from the organelles to the nuclear chromosomes. The map-based sequence has proven useful for the identification of genes underlying agronomic traits. The additional single-nucleotide polymorphisms and simple sequence repeats identified in our study should accelerate improvements in rice production
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