- 著者
- 古舘 信生 高橋 修
- 出版者
- 社団法人 日本写真学会
- 雑誌
- 日本写真学会誌 (ISSN:03695662)
- 巻号頁・発行日
- vol.76, no.5, pp.366-377, 2013
銀塩カメラがデジタルカメラに置き換わっている中で,銀塩プリントが市場で活躍していることは,銀塩プリントの基となる銀塩カラーペーパーの品質,コスト,簡便さに負うところが大きい.<br>本「解説」では,銀塩カラーペーパーを構成する主要技術である写真用カプラー技術,特に,色相と画像保存性に関する技術の変遷について,イノベーションの成果が現れた4つの時期に焦点を当てて概観する.第1期は,1970年頃の近代的カプラー群の誕生の時期であり,第2期は1984年~85年頃で,日本企業がコダックに一部の技術で先行した時期である.第3期は,マゼンタ新骨格導入を巡り日本国内企業が大競争を展開した1989年~91年頃である.そして,第4期の1999年~2004年頃は,最後に残された課題(シアン,イエローの色相,画像保存性)を抜本的に解決した時期である.<br>銀塩カラーペーパーは,第4期のプリント感材完成の技術によって,デジタルプリントやフォトブックなどのサービスを通じて今後とも市場で生き続けて行くことであろう.
- 著者
- Hamako Sasamoto Sakae Suzuki Hossein Mardani-Korrani Yutaka Sasamoto Yoshiharu Fujii
- 出版者
- Japanese Society for Plant Biotechnology
- 雑誌
- Plant Biotechnology (ISSN:13424580)
- 巻号頁・発行日
- vol.38, no.1, pp.101-107, 2021-03-25 (Released:2021-03-25)
- 参考文献数
- 30
- 被引用文献数
- 2
Allelopathic activities of three carotenoids of a natural pigment group, neoxanthin, crocin and β-carotene, were assayed by the protoplast co-culture method with digital image analysis (DIA-PP method). Effects on three different growth stages of lettuce protoplasts, i.e., cell wall formation, cell division, and yellow pigment accumulation, were investigated using 96-well culture plates. Cell division was inhibited 65–95% by all three carotenoids at 33–100 µM. Inhibition of cell division stage was stronger than at the cell wall formation stage in neoxanthin, and the water-soluble carotenoid, crocin, whose yellow pigment was incorporated into the vacuole of lettuce protoplasts. Neoxanthin at 33 µM and crocin at higher than 100 µM inhibited more than 100% of the yellow pigment accumulation. By contrast, at low concentrations (0.01–1 µM) β-carotene stimulated growth at the cell division stage. At high concentrations of β-carotene (100–500 µM), inhibition was prominent at all three stages, and also in neighboring wells of zero control, which suggested emission of a volatile compound by β-carotene. They were compared with the report of the volatile compound, tulipalin A. Differences in patterns of inhibition of carotenoids on lettuce protoplast growth were compared with reports of another natural pigment, anthocyanin, and anthocyanin-containing red callus cultured in the light, and with that of neoxanthin-containing yellow callus cultured in the dark.
- 著者
- Ken-ichiro Taoka Zenpei Shimatani Koji Yamaguchi Mana Ogawa Hiromi Saitoh Yoichi Ikeda Hiroko Akashi Rie Terada Tsutomu Kawasaki Hiroyuki Tsuji
- 出版者
- Japanese Society for Plant Biotechnology
- 雑誌
- Plant Biotechnology (ISSN:13424580)
- 巻号頁・発行日
- vol.38, no.1, pp.89-99, 2021-03-25 (Released:2021-03-25)
- 参考文献数
- 44
- 被引用文献数
- 7
Luciferases have been widely utilized as sensitive reporters to monitor gene expression and protein-protein interactions. Compared to firefly luciferase (Fluc), a recently developed luciferase, Nanoluciferase (NanoLuc or Nluc), has several superior properties such as a smaller size and stronger luminescence activity. We compared the reporter properties of Nluc and Fluc in rice (Oryza sativa). In both plant-based two-hybrid and split luc complementation (SLC) assays, Nluc activity was detected with higher sensitivity and specificity than that with Fluc. To apply Nluc to research involving the photoperiodic regulation of flowering, we made a knock-in rice plant in which the Nluc coding region was inserted in-frame with the OsMADS15 gene, a target of the rice florigen Hd3a. Strong Nluc activity in response to Hd3a, and in response to change in day length, was detected in rice protoplasts and in a single shoot apical meristem, respectively. Our results indicate that Nluc assay systems will be powerful tools to monitor gene expression and protein-protein interaction in plant research.
1 0 0 0 横溝正史 ; 海野十三 ; 小栗虫太郎 ; 木々高太郎
- 出版者
- 講談社
- 巻号頁・発行日
- 1973
