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1998 (1)
1993 (2)
1Author    Ichiro Honda, Makoto Sibagaki, Koichi Yoneyama, Yoshihiro Nakajima, Makoto Konnai, Nobutaka Takahashi, Shigeo YoshidaRequires cookie*
 Title    Photosystem II Inhibition by Phloroglucinol Derivatives Having Both Phenol and Urea Functionalities  
 Abstract    Esters o f 3-nitrophloroglucinecarboxylic acid were found to be active photosystem II (PS II) inhibitors, as were the amides, indicating that, in their structures, the substituted phlorogluci­ nol nuclei themselves plays a major roles in PS II inhibition. A m ong the phenylureidoalkyl esters tested, 3,4-dichlorophenylurea com pound having two amino hydrogen atom s showed high activities. Optimal activity was associated with compounds in which the oxygen atom and the urea structure in the ester side chain were connected via an ethylene group. 
  Reference    Z. Naturforsch. 48c, 159 (1993); received November 3 1992 
  Published    1993 
  Keywords    Photosystem II, Electron Transport Inhibition, Phloroglucinol Derivatives 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0159.pdf 
 Identifier    ZNC-1993-48c-0159 
 Volume    48 
2Author    Koichi Yoneyama, Yoshihiro Nakajima, Masaru Ogasawara, Hitoshi Kuramochi, Makoto Konnai, Hajime Iwamura, Fumihiko Sato, Katsunori Ichinose, Tadao Asami, Nobutaka Takahashi, Shigeo YoshidaRequires cookie*
 Title    Photosystem II Inhibition by Pyran-enamine Derivatives  
 Abstract    Through the studies on structure-activity relationships o f 5-acyl-3-(l-am inoalkylidene)-4-hydroxy-2 H-pyran-2,6(3 H)-dione derivatives in photosystem II (PS II) inhibition, overall lipophilicity o f the m olecule was found to be a major determinant for the activity. In the sub­ stituted N -benzyl derivatives, not only the lipophilicity but also the electronic and steric char­ acters o f the substituents greatly affected the activity. Their mode o f PS II inhibition seemed to be similar to that o f D C M U , whereas pyran-enamine derivatives needed to be highly lipophilic to block the electron transport in thylakoid membranes, which in turn diminished the permea­ bility through biomembranes. 
  Reference    Z. Naturforsch. 48c, 163 (1993); received November 3 1992 
  Published    1993 
  Keywords    Photosystem II, Electron Transport Inhibition, Pyran-enamine Derivatives 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0163.pdf 
 Identifier    ZNC-1993-48c-0163 
 Volume    48 
3Author    Chandra Surendra, Subash Sabat3, Prasanna Padhyeb, MohantycRequires cookie*
 Title    Inhibitory Effects of Synthetic Lanthanum-Crown Ether at the Reducing Side of Photosystem II  
 Abstract    Inhibitory effects of lanthanum-crown [La-(Pic)3 (15-crown-6) 3H2OJ.was investigated on the 0 2 evolution activity of photsystem II particles. Lanthanum (La)-crown inhibited the electron flow at the reducing side of PS II complex. Short duration (1 -2 min) treatment of PS II membranes with trypsin partly developed resistance to La-crown inhibition. However, longer proteolytic treatment (>2 min) appeared to expose newer site(s) for La-crown inhibi­ tion. The inhibitory constant (K,) for La-crown was nearly 0.17 | j ,m . This inhibitory capacity is about 4 to 5 times less than the potent PS II inhibitor diuron which also binds at the acceptor side of PS II. The number of binding sites for La-crown was found to be 1 per 20 chlorophyll molecules. The Hill plot analysis showed the presence of three distinct straight lines suggesting that the compound acts at least at three sites. Furthermore, from the slope value (Hill coefficient) it is suggested that two of these sites provide minimum of two binding domains for the inhibitor. 
  Reference    Z. Naturforsch. 53c, 49 (1998); received June 16/September 29 1997 
  Published    1998 
  Keywords    Beta vulgaris, Electron Transport Inhibition, Lanthanum Crown, Photosystem II Particles 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0049.pdf 
 Identifier    ZNC-1998-53c-0049 
 Volume    53