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Historical Development of Diffusion Studies
Koiwa Masahiro 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.6
A brief review is given on the historical development of the quantitative study of diffusion: the establishment of the diffusion law by A. Fick, the first quantitative measurement of solid state diffusion (Au in Pb) by W. C. Roberts-Austen and the demonstration of the self-diffusion in Pb using natural radioactive isotope by G. Hevesy.
Hisashi Koiwa,,Stephane Hausmann,Bang, Woo-Young,Akihiro Ueda,Naoko Kondo,Akihiro Hiraguri,Toshiyuki Fuku,hara,Bahk, Jeong-Dong,Yun, Dae-Jin,Ray A. Bressan,Paul M. Hasegawa,Stewart Shuman Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-
Transcription and mRNA processing are regulated by phosphorylation and dephosphorylation of the C-terminal domain (CTD) of RNA polymerase Ⅱ, which consists of tandem repeats of a Y^(1)S^(2)P^(3)T^(4)S^(5)P^(6)S^(7) heptapeptide. Previous studies showed that members of the plant CTD phosphatase-like (CPL) protein family differentially regulate osmotic stress-responsive and abscisic acid-responsive transcription in Arabidopsis thaliana. Here we report that AtCPL1 and AtCPL2 specifically dephosphorylate Ser-5 of the CTD heptad in Arabidopsis RNA polymerase Ⅱ, but not Ser-2. An N-terminal catalytic domain of CPL1, which suffices for CTD Ser-5 phosphatase activity in virto, includes a signature DXDXT acylphosphatase motif, but lacks a breast cancer 1 CTD, which is an essential component of the fungal and metazoan Fcp1 CTD phosphatase enzymes. The CTD of CPL1, which contains two putative double-stranded RNA binding motifs, is essential for the in vivo function of CPL1 and includes a C-terminal 23-aa signal responsible for its nuclear targeting. CPL2 has a similar domain structure but contains only one double-stranded RNA binding motif. Combining mutant alleles of CPL1 and CPL2 causes synthetic lethality of the male but not the female gametes. These results indicate that CPL1 and CPL2 exemplify a unique family of CTD Ser-5-specific phosphatases with an essential role in plant growth and development.
A Mismatch hybridization of α-Chitin Gel with β-Chitin Gel on the Preparation of Non-woven Fabrics
( Hiroshi Tamura ),( Serika Koiwa ),( Shinobu Okazaki ),( Seiichi Tokura ) 한국키틴키토산학회 2003 한국키틴키토산학회지 Vol.8 No.4
N/A Both α-chitin from Crab or Shrimp shells and β-chitin from squid pen were found to dissolve in calcium chloride dihydrate saturated methanol (chitin solvent) and regenerated to α-chitin type non-woven fabrics applying chitin hydrogel which was prepared by precipitation with addition of large excess of water to chitin solution. But β-chitin type no-woven fabrics was obtained from β-chitin slurry which was prepared by repeated mechanical agitation of β-chitin powder in limited amount of water followed by filtration of chitin slurry. Though the high tensile strengths were shown by each type of non-woven fabrics, low tensile property was shown by mixed type non-woven fabrics (α-chitin hydrogel+β-chitin hydrogel) probably due to mismatching of both polysaccharide molecule on th hybridyzation to form no-woven fabrics.