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'Cyclic AMP' in keywords
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1988 (1)
1983 (1)
1980 (1)
1Author    M. Ichael, G. H. Ahn, H. Ans, G. RisebachRequires cookie*
 Title    Cyclic AMP Is Not Involved as a Second Messenger in the Response of Soybean to Infection by Phytophthora megasperma f. sp. glycinea  
 Abstract    cAMP levels were monitored in soybean (Glycine max) infected with race 1 o f Phytophthora megasperma f. sp. glycinea and in soybean cell suspension cultures treated with a glucan elicitor from P. megasperma. While cAMP could be readily detected in soybean hypocotyls using a rad io ­ immunoassay, no correlation was observed between infection and cAMP levels. N o cAMP was detected in suspension cultured soybean cells. These results suggest that cAMP does not play a significant role in the plant's response to fungal attack, or the response o f suspension cultured cells to elicitor. 
  Reference    Z. Naturforsch. 38c, 578 (1983); received April 12 1983 
  Published    1983 
  Keywords    Cyclic AMP, Radioimmunoassay, Phytoalexins, Glycine max, Phytophthora megasperma 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0578.pdf 
 Identifier    ZNC-1983-38c-0578 
 Volume    38 
2Author    Hans EcksteinRequires cookie*
 Title    Evidence for Cyclic GMP in the Yeast Saccharomyces cerevisiae, and Studies on Its Possible Role in Growth  
 Abstract    The yeast Saccharomyces cerevisiae is shown to be equipped with cyclic GMP, the level of which ranges from 6 pmol/10 9 cells with pressed baker's yeast to 21 pmol/10 9 cells with exponentially growing cells. In extracts from synchronized growing yeast, cyclic GMP increases stepwise, being doubled at the time of each mitosis. Theophylline and 3-isobutyl-l-methylxanthine induce a rapid increase of cyclic GMP, followed by a premature formation of the septal cell wall between mother cell and bud. The effects of 3-isobutyl-l-methylxanthine are reversible. Dibutyryl-cyclic GMP, and, after a pronounced lag, also dibutyryl-cyclic AMP, induce a premature cell division, too. Cholera toxin induces premature cell divisions without a preceding increase in cyclic GMP. Neither theophylline nor 3-isobutyl-l-methylxanthine, cholera toxin or one of the dibutyryl-cyclic nucleotides modify the growth rate of the culture. None of the agents has significant effects on the level of cyclic AMP. The results suggest that cyclic GMP possibly controls an early step of mitosis, whereas ADP-ribosylation might govern a subsequent event. 
  Reference    Z. Naturforsch. 43c, 386—396 (1988); received October 20 1987 
  Published    1988 
  Keywords    Cyclic GMP, Cyclic AMP, Phosphodiesterase Inhibitors, Cholera Toxin, Growth, Yeast 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0386.pdf 
 Identifier    ZNC-1988-43c-0386 
 Volume    43 
3Author    C. Sauer, U. SchwabeRequires cookie*
 Title    M ethod for the Selective 2 '-0 -S u b stitu tio n o f N ucleosides  
 Abstract    This paper presents a new method for selective reactions o f predetermined sugar hydroxyls o f nucleosides. Suc-cinylated nucleosides were investigated as examples for the use of the cyclic phosphate group for protecting purposes. Starting from cyclic AMP the 2'-0-group was selectively succinylated yielding 93% 2'-0-succinyl cyclic AMP. The cyclic phosphate was enzymatically dephosphorylated in a one step procedure under neutral conditions and 2 '-0 -suc-cinyl adenosine containing a small amount o f the 3'-0-isomer was produced in 91% yield. When establishment of equilibrium of the 2'-0-and 3'-0-isomers was allowed, 54% yield of crystallized 3'-0-succinyl adenosine was prod­ uced. The results suggest that the easily accessible cyclic monophosphates are good protecting groups for the pro­ duction of nucleoside derivatives, especially at the 2 '-0 -position under neutral conditions. 
  Reference    Z. Naturforsch. 35c, 163—167 (1980); received June 15/September 21 1979 
  Published    1980 
  Keywords    Cyclic AMP, Enzymatic Synthesis, Cyclic Phosphate as Protection Group, 2'-0-Succinyl Adenosine, 2'-0-Substitu-tion o f Nucleosides 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0163_n.pdf 
 Identifier    ZNC-1980-35c-0163_n 
 Volume    35