Atsushi Yamagishi

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The mechanism of the severe quenching of chlorophyll (Chl) fluorescence under drought stress was studied in a lichen Physciella melanchla, which contains a photobiont green alga, Trebouxia sp., using a streak camera and a reflection-mode fluorescence up-conversion system. We detected a large 0.31 ps rise of fluorescence at 715 and 740 nm in the dry lichen(More)
Intact fucoxanthin (Fucox)-chlorophyll (Chl)-binding protein I-photosystem I supercomplexes (FCPI-PSIs) were prepared by a newly developed simple fast procedure from centric diatoms Chaetoceros gracilis and Thalassiosira pseudonana to study the mechanism of their efficient solar energy accumulation. FCPI-PSI purified from C. gracilis contained 252 Chl a, 23(More)
Designing the shapes of products is the primary activity of the design process. In this paper, we propose a new model representing free form shape features with the aim of making the system capable of holding and manipulating the shape features after synthesis in order to support the designer early in the design process. The key concept of this study is the(More)
The ultrafast fluorescence dynamics of photosystem I (PS I) purified from a marine centric diatom, Chaetoceros gracilis, at 17 K was studied using fluorescence up-conversion and streak-camera setups. The experiments were done for two kinds of sample preparations containing different amounts of the peripheral antenna proteins, the fucoxanthin-chlorophyll(More)
Time-resolved fluorescence spectra of photosystem I (PS-I) trimeric complex isolated from a thermophilic cyanobacterium, Thermosynechococcus (T.) elongatus, were observed at 15 K over the time range from 100 fs to a few nanoseconds under P700-oxidized condition and 10 ps to a few nanoseconds under P700-reduced condition. Global-fitting analysis of the data(More)
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