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21Author    K. H. Grumbach, M. DrollingerRequires cookie*
 Title    The Effect of Phytochrome and Proteinsynthesis-Inhibitors on the Formation of Chlorophylls and Carotenoids in Radish Seedlings Treated with Photosystem II and Bleaching Herbicides  
 Abstract    Etioplasts of radish seedlings treated with photosystem II (DCM U, bentazon) and chlorotic herbicides (amitrole, SAN 6706) were tested on their ability to perform the phytochrome mediated chlorophyll and carotenoid biosynthesis. The cytoplasmic influence on the chloroplastic action o f herbicides was also investigated by inhibition of protein synthesis either in the chloro­ plast with chloramphenicol or in the cytoplasm with actidion. In all herbicide treated radish seedlings a phytochrome mediated chlorophyll and carotenoid biosynthesis was obtained as found in control plants. In plants treated with DCM U the bio­ synthesis o f carotenoids is enhanced compared to the control plants, while SAN 6706 significantly suppresses the carotenoid formation. It is concluded, that photosystem II and chlorotic herbicides do not interfere with the primary action o f phytochrome but rather do develope their effects on the terpenoid metabolism through phytochrome. Chloramphenicol applied at the time o f sowing very strongly suppresses the formation of chlorophylls and carotenoids in control plants. The sensitivity towards actidion is, however, very much lower. If chloramphenicol and actidion treated plants were also supplied with herbicides, the pigment pattern is completely different In SAN 6706-treated plants chloramphenicol acts synergistic, resulting in an even lower chlorophyll and carotenoid content than in plants supplied only with chloramphenicol. On the other hand SAN 6706 in combination with actidion enhances the formation of pigments, leading to a much higher chlorophyll and carotenoid content as in plants treated only with actidion. A stimulatory effect on the formation o f chlorophylls and carotenoids was also found for DCMU-treated plants in combination with actidion. The observation, that in plants treated with SAN 6706 together with actidion, which inhibits protein synthesis in the cytoplasm, the herbicidal response in the chloroplast is completely abolished, gives evidence that the photooxidative action of SAN 6706 in the chloroplast is developed by the cytoplasm. 
  Reference    Z. Naturforsch. 35c, 445 (1980); received February 8 1980 
  Published    1980 
  Keywords    Photosystem II Herbicides, Chlorotic Herbicides, Chlorophylls, Carotenoids, Phytochrome, Inhibitors 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0445.pdf 
 Identifier    ZNC-1980-35c-0445 
 Volume    35 
22Author    Laurie Tompkins, JeffreyC. HallRequires cookie*
 Title    Drosophila M ales Produce a Pheromone which Inhibits Courtship  
 Abstract    Normal Drosophila males produce a volatile pheromone which inhibits courtship. This chemical cue is not identical to the pheromone made by mated female flies, which also inhibits male sexual behavior. Mutant olfC males, which fail to respond to several organic compounds, are not inhibited by the pheromone made by males; hence, unlike normal sexually mature males, olfC males court each other vigorously. 
  Reference    Z. Naturforsch. 36c, 694—696 (1981); received March 121981 
  Published    1981 
  Keywords    Drosophila melanogaster, Sex Pheromone, Sexual Behavior, Inhibitor, Behavioral Mutant 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0694_n.pdf 
 Identifier    ZNC-1981-36c-0694_n 
 Volume    36 
23Author    W. S. Cohen, J. R. BartonRequires cookie*
 Title    The Use of 0 2-Evolving Subchloroplast Particles to Study Acceptor and Inhibitor Sites on the Reducing Side of Photosystem II  
 Abstract    Photosystem II particles that retain the ability to evolve 0 2 have been used to exam ine acceptor and inhibitor sites in the photosynthetic electron transfer chain between Q and plasto-quinone. Employing the water to dichlorobenzoquinone reaction to assay photosystem II activity, we have demonstrated that electron transport in thylakoids and particles is equally sensitive to inhibition by D C M U , dinoseb, metribuzin, H Q N O and DBMIB. Based on differential sensitivity to inhibition by D C M U vs. H Q N O or DBMIB, we suggest that when synthetic quinones, e.g. 2,6-dichlorobenzoquinone operate as Hill reagents in particles they are reduced primarily by the plastoquinone pool. W hen synthetic quinones, e.g. 5,6-m ethylenedioxy-2,3-dim ethyl benzoquinone act as autoxidizable acceptors they accept electron from the Q /B com plex at a point that is located between the D C M U and H Q N O (DBM IB) inhibition sites. 
  Reference    Z. Naturforsch. 38c, 793—798 (1983); received April 26 1983 
  Published    1983 
  Keywords    Thylakoids, Photosystem II Particles, Q uinones, Inhibitors, Electron Transfer 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0793.pdf 
 Identifier    ZNC-1983-38c-0793 
 Volume    38 
24Author    Gerhard Sandmann, IanE. Clarke, PeterM. Bramley, Peter BögerRequires cookie*
 Title    Inhibition of Phytoene Desaturase — the Mode of Action of Certain Bleaching Herbicides  
 Abstract    Assay systems have been developed in order to differentiate betw een the m odes o f action o f certain bleaching herbicides. These include inhibition o f chlorophyll or carotenoid biosynthesis, and initiation o f pigment degradation. H erbicidal com pounds with phytoene desaturase as their primary target site were investigated in a cell-free carotenogenic system from Aphanocapsa. In a comparative study, the structural prerequisites for inh ib ition o f phytoene desaturase were estab­ lished for both benzophenone analogs and various m -phenoxybenzam ides. This inhibitory action o f the latter compounds is enhanced by lipophilic groups with certain steric properties. 
  Reference    Z. Naturforsch. 39c, 443 (1984); received N ovem ber 1 1983 
  Published    1984 
  Keywords    Bleaching Herbicides, Cell-Free System, Carotene Biosynthesis, P hytoene Desaturase, Inhibitors 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0443.pdf 
 Identifier    ZNC-1984-39c-0443 
 Volume    39 
25Author    ZlatinaG. Naydenova3, KonstantinC. Grancharov3, DimitarK. Alargov3, EvgenyV. Golovinsky3, IvankaM. Stanoevab, LilianaD. Shalamanovab, IlzaK. PajevabRequires cookie*
 Title    Inhibition of UDP-glucuronosyltransferase by 5'-0-am ino Acid and Oligopeptide Derivatives of Uridine: Structure-Activity Relationships  
 Abstract    The inhibitory effect of a series of 5'-0-am ino acid and oligopeptide derivatives of uridine on rat liver UDP-glucuronosyltransferase (U G T) activities was investigated using two assay systems. A quantitative structure-activity relationship (Q SA R) study was performed. The compounds include a lipophilic residue linked to the nucleoside by a variable spacer. More­ over, half of the derivatives have two spacers linked to the uridine moiety. Compound 1, a serine derivative of isopropylideneuridine, was found to be the most potent inhibitor of both 4-nitrophenol (4-NP) and phenolphthalein (PPh) glucuronidation, with an I50 of 0.45 m M and 0.22 m M , respectively. Kinetic studies with this substance revealed a mixed type of inhibition towards 4-NP and UDP-glucuronic acid, with apparent Ki values of 150 ^ m and 120 (.i m , respectively. The dipeptide derivatives 11-14 exhibited a low activity against 4-NP conjuga­ tion. However, a marked suppression of PPh glucuronidation was found with compounds 11 and 13. Generally, compounds with two spacers are more inhibitory against the U G T activi­ ties studied. The Q SA R analysis outlined the significance of the spacers with a minimum length of 5 atoms and lipophilic residues linked to them for the inhibitory effect of the compounds. The most significant contribution to this effect is given by the six-atom spacer for both, 4-NP and PPh substrates. 4-NP converting U G T isoforms seem to respond more specifically to the inhibitors: a five-atom for the first and a six-atom for the second spacer enhance binding to both 4-NP and PPh conjugating isoenzymes, while a long second spacer contributes to inhibitor binding to U G T isoforms only converting PPh. 
  Reference    Z. Naturforsch. 53c, 173—181 (1998); received November 4 1997/January 14. 1998 
  Published    1998 
  Keywords    UDP-glucuronosyltransferase, Microsomes, Uridine Derivatives, Inhibitors, Q SA R 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0173.pdf 
 Identifier    ZNC-1998-53c-0173 
 Volume    53 
26Author    Ernst PriesnerRequires cookie*
 Title    Receptors for D i-U nsaturated Pherom one Analogues in the M ale Summerfruit Tortrix M oth  
  Reference    Z. Naturforsch. 38c, 874—8 (1983); received June 30 1983 
  Published    1983 
  Keywords    Sex Pherom ones, Inhibitors, T etradecadienyl A cetates, O lfactory Receptors, Adoxophyes, T ortricidae 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0874_n.pdf 
 Identifier    ZNC-1983-38c-0874_n 
 Volume    38 
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