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An actinoporin plays a key role in water stress in the moss <i>Physcomitrella patens</i>
Hoang, Quoc Truong,Cho, Sung Hyun,McDaniel, Stuart F.,Ok, Sung Han,Quatrano, Ralph S.,Shin, Jeong Sheop Blackwell Publishing Ltd 2009 The New phytologist Vol.184 No.2
<P>Summary</P><UL><li level='1'>Modern land plants arose from a green algae-like ancestor <I>c</I>. 480 million years ago. While several novel morphological features were critical for survival in the aerial environment, physiological innovation undoubtedly played a key role in the colonization of terrestrial habitats. Recently, actinoporin genes, a small group of pore-forming toxins from sea anemones, have been found in the bryophyte and lycophyte lineages of land plants where they are upregulated in water-stressed tissues.</LI><li level='1'>The bryoporin gene in the moss <I>Physcomitrella patens</I> (<I>PpBP</I>) was functionally characterized by RNA blot analyses and overexpression in <I>P. patens</I>. In order to examine functional homology between PpBP and sea anemone actinoporins, the recombinant PpBP was subjected to hemolytic analysis of pig blood cells, which is one of the specific activities of actinoporins.</LI><li level='1'>PpBP was upregulated by various abiotic stresses, in particular most strongly by dehydration stress. Overexpression of the bryoporin gene heightens drought tolerance in <I>P. patens </I>significantly. In addition, PpBP shared the highest structural homology with actinoporins in a three-dimensional structural database and showed hemolytic activity.</LI><li level='1'>These results suggest that this phylogenetic distribution may have resulted from an ancient horizontal gene transfer and actinoporins may have played an important role in early land plants.</LI></UL>
곤충 모방 날갯짓 비행체의 안정적인 수직 이륙 비행 구현
판호앙부(Hoang-Vu Phan),트롱쾅트리(Quang-Tri Truong),구옌쿠옥비엣(Quoc-Viet Nguyen),박훈철(Hoon Cheol Park),변도영(Doyoung Byun),구남서(Nam Seo Goo) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.2
This paper demonstrates how to implement inherent pitching stability in an insect-mimicking flapping-wing system for vertical takeoff. Design and fabrication of the insect-mimicking flapping-wing system is briefly described focusing on the recent modification. Force produced by the flapping-wing systems is estimated using the UBET (Unsteady Blade Element Theory) developed in the previous work. The estimation shows that the wing twist placed in the modified system can improve thrust production for about 10 %. The estimated thrust is compared with the measured thrust, which proves that the UBET provides fairly good estimations for the thrust produced by the flapping-wing systems. The vertical takeoff test shows that inherent pitching stability can be implemented in an insect-mimicking flapping-wing system by aligning the aerodynamic force center and center of gravity.
Nhung Thanh Thi Truong,Tam Huu Nguyen,Bao Kim Doan,Le-Thu T. Nguyen,Tam Hoang Luu,Chau Duc Tran,Thiet Quoc Nguyen,Ha Tran Nguyen 한국고분자학회 2021 Macromolecular Research Vol.29 No.11
In this research, three organic photocatalysts, 4-(4H-dithieno[3,2-b:2',3'- d]pyrrol-4-yl)-N,N-diphenylaniline, 4-(pyren-1-yl)-4H-dithieno[3,2-b:2',3'-d]pyrrole and 4-(6b,10-dihydroperylen-3-yl)-4H-dithieno[3,2-b:2',3'-d]pyrrole have been successfully synthesized through C-N coupling reactions. The chemical structures and the optical properties of the obtained organic photocatalysts have been characterized via 1H NMR,13C NMR, elemental analysis, and UV-Vis spectroscopy. Next, these dithieno[3,2-b:2′,3′-d]pyrrole-based photocatalysts have been used for the polymerization of methyl methacrylate, 2-(dimethylamino)ethyl methacrylate and tert-butyl methacrylate monomers under 365 nm UV irradiation, resulting in (meth)acrylate polymers with controlled molecular weights and low polydispersity indexes.