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1984 (1)
1979 (1)
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1Author    Rolf BeiderbeckRequires cookie*
 Title    Kontakt von Agrobacterium mit Wundrandzellen als Vorbedingung für eine Tumorinduktion Contact of Agrobacterium with Wound Cells as a Prerequisite of Tumor Induction  
 Abstract    Tumor induction by Agrobacterium tumefaciens on Kalanchoe leaves is suppressed by charcoal mixed with the inoculum. The inhibition works best with a certain mass relation between bacteria and charcoal. The bacteria become adsorbed to the charcoal particles and in this state they are unable to induce tumors. If charcoal is added to bacteria-infected wounds only 15 min after in­ fection it is not interfering with tumor formation. These results are supporting the hypothesis of sites in the wound to which Agrobacterium has to be attached to incite tumors. 
  Reference    (Z. Naturforsch. 31c, 317 [1976]; eingegangen am 27. Januar/9. März 1976) 
  Published    1976 
  Keywords    Agrobacterium, Plant Tumor, Attachment, Activated Charcoal 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0317.pdf 
 Identifier    ZNC-1976-31c-0317 
 Volume    31 
2Author    N. Orbert, A. Dencher, Eilo HildebrandRequires cookie*
 Title    Sensory Transduction in Halobacterium halobium: Retinal Protein Pigment Controls UV-Induced Behavioral Response  
 Abstract    Both photosystems, PS 370 and PS 565, controlling behavioral responses in H alobacterium halo-bium [E. Hildebrand and N. Dencher, Nature 2 5 7 ,4 6 — 48 (1975)] are reversibly inhibited when bacteria are grown in the presence o f 1 mM nicotine which is known to block biosynthesis o f reti­ nal. Photobehavior can be restored within som e minutes to hours by adding retinal to nicotine-treated bacteria, PS 370 thereby reappearing earlier than PS 565. The reconstitution rate depends on the concentration and on the kind o f retinal isomers applied. A \\-trans retinal is m ost effective. PS 370 becomes fully sensitive if reconstituted in the presence o f nicotine. This rules out the possi­ bility that the alkaloid may directly inhibit steps o f signal transmission follow ing photoreception. The action spectrum o f PS 370 regenerated with retinal alone o f H. h., strain RjLg (a mutant deficient in carotenoids), fails to show all secondary peaks around 450 nm which in strain Rj occur besides the prominent maximum at 370 nm. A ddition o f carotenoids (m ainly a-bacterioruberin) to reconstituted cells o f R ,L3 restores the sensitivity in that spectral region. Carotenoids or flavin solely added to nicotine-treated bacteria cannot restore photobehavior. We conclude that the active pigm ent o f PS 370, which m ediates the photophobic response to increase o f light intensity (step-up response), represents a retinal protein com plex and that carote­ noids participate in photoreceptor function as accessory pigments. The biochem ical relation o f the UV-absorbing retinal protein com plex to bacteriorhodopsin is discussed. 
  Reference    Z. Naturforsch. 34c, 841 (1979); received June 5/July 6 1979 
  Published    1979 
  Keywords    Bacteria, Photophobic Response, Bacteriorhodopsin, Carotenoids, Accessory Pigment 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0841.pdf 
 Identifier    ZNC-1979-34c-0841 
 Volume    34 
3Author    M. WinkRequires cookie*
 Title    Chemical Defense of Leguminosae. Are Quinolizidine Alkaloids Part of the Antimicrobial Defense System of Lupins?  
 Abstract    Growth o f 6 bacteria (Serratia marcescens, Bacillus megaterium , Bacillus subtilis, Streptococcus viridis, Micrococcus luteus, and M ycobacterium ph lei) was inhibited by 50% if the growth m edium contained sparteine at concentrations between 0 .5 -1 0 m M . Total growth inhibition, which was bacteriostatic in nature, was achieved at 20 m M . The growth o f 6 phytopathogenic fungi was also affected: at a sparteine concentration o f 15 m M the growth o f Alternaria porri was reduced by 40% as compared to the untreated control. R espective values were 18% inhibition for Piricularia oryzae, 33% for H elminthosporium carbonum, 15% for R hizoctonia solani, 5% for Fusarium oxysporum, and 42% for Asperquillus oryzae. Since the concentrations o f quinolizidine alkaloids range from 1 -2 0 0 m M (roots, leaves, or stems) or 1 0 -2 0 0 m m ol/k g (seeds) in Legum inosae, it is discussed whether quinolizidine alkaloids are involved in the antim icrobial defense o f lupins, in addition to their potential role as allelopathic or herbivore repellent defense com pounds. 
  Reference    Z. Naturforsch. 39c, 548 (1984); received January 23 1984 
  Published    1984 
  Keywords    Quinolizidine Alkaloids, Growth Inhibition, Bacteria, Fungi, Antim icrobial Defense 
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 TEI-XML for    default:Reihe_C/39/ZNC-1984-39c-0548.pdf 
 Identifier    ZNC-1984-39c-0548 
 Volume    39