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'Precursors' in keywords
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1996 (1)
1982 (1)
1Author    R. Buheitel, W. M. Ilius, W. SchnickRequires cookie*
 Title    Synthese und Kristallstruktur von Cl3 Ti[N(SiMe2 Cl)(SiMe2NH2)]  
 Abstract    Cl3Ti[N(SiMe2Cl)(SiM e2NH2)] is yielded by reaction of TiCl4 with two molecules ClMe2SiNHSiMe3. A single crystal structure determination (P 2 , //*, a = 747.12(2), b = 1294.1(3), c = 1496.7(3) pm, ß = 90.30(3)°, Z = 4) shows a planar four-membered ring Ti-N-Si-N as the central feature of the monomers formed by a weak coordinative bond of the NH2 group to the Ti atoms. The monomers are connected to eive dimers via two Cl bridses linked to the Ti atoms. 
  Reference    Z. Naturforsch. 51b, 1141—1144 (1996); eingegangen am 19. Februar 1996 
  Published    1996 
  Keywords    Silazanes, Nitrido Bridges, Precursor, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1141.pdf 
 Identifier    ZNB-1996-51b-1141 
 Volume    51 
2Author    Jürgen Beck, Gerhart DrewsRequires cookie*
 Title    Tetrapyrrol Derivatives Shown by Fluorescence Emission and Excitation Spectroscopy in Cells of Rhodopseudomonas capsulata Adapting to Phototrophic Conditions  
 Abstract    Aerobically in the dark grown cells were incubated semiaerobically (30 min) and afterwards 180 min anaerobically in the light During phototrophic induction the bacteriochlorophyll concentra­ tion increased from 0.26 to 2 . 1 0 nmol/mg cell protein. In samples taken at different times after lowering o f oxygen partial pressure the following tetrapyrrol derivatives were identified by fluorescence emission and excitation spectroscopy at 1.7 K: Mg-protoporphyrin EX-monomethylester, Mg-2,4-divinylphaeoporphyrin a5-monomethylester, 2-de-vinyl-2 -hydroxyethyl-chlorophyllide, 2 -devinyl-2 -hydroxyethyl-pheophorbide, chlorophyllide a, pheophorbide, bacteriopheophorbide, bacteriopheophytin, bacteriochlorophyllide and bacte­ riochlorophyll a in different pigment complexes. The highest relative concentrations o f bacte­ riochlorophyll precursors normalized to the total amount o f bacteriochlorophyll a were found in cells during the first hour o f adaptation at 0.5 ^g Bchl/mg cell protein or less. 
  Reference    Z. Naturforsch. 37c, 199 (1982); received December 29 1981 
  Published    1982 
  Keywords    Bacteriochlorophyll Complexes, Precursors, Tetrapyrrols, Rhodopseudomonas capsulata, Photosynthetic Apparatus 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0199.pdf 
 Identifier    ZNC-1982-37c-0199 
 Volume    37