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'Mass Spectrometry' in keywords Facet   Publication Year 1996  [X]
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1Author    W.I G Ruszeckia, K. Strzałk, K.P B Ad Erc, A. R. Adunzc, G. H. SchmRequires cookie*
 Title    Involvement of the Xanthophyll Cycle in Regulation of Cyclic Electron Flow around Photosystem II  
 Abstract    In our previous study (Gruszecki et al., 1995) we have postulated that the mechanism of cyclic electron transport around photosystem II, active under overexcitation of the photosyn­ thetic apparatus by light is under control of the xanthophyll cycle. The combination of dif­ ferent light quality and thylakoids having various levels o f xanthophyll cycle pigments were applied to support this hypothesis. In the present work photosynthetic oxygen evolution from isolated tobacco chloroplasts was measured by means o f mass spectrometry under conditions of high or low levels of violaxanthin, being transformed to zeaxanthin during dark incubation in an ascorbate containing buffer at pH 5.7. Analysis of oxygen evolution and o f light-induced oxygen uptake indicate that the de-epoxidation o f violaxanthin to zeaxanthin results in an increased cyclic electron transport around PS II, thus dimishing the vectorial electron flow from water. An effect similar to de-epoxidation was observed after incubation of thylakoid membranes with specific antibodies against violaxanthin. 
  Reference    Z. Naturforsch. 51c, 47 (1996); received September 22/O ctober 18 1995 
  Published    1996 
  Keywords    Xanthophyll Cycle, Cyclic Electron Flow, Photosystem II, Oxygen Evolution, Blue Light Effect, Mass Spectrometry 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0047.pdf 
 Identifier    ZNC-1996-51c-0047 
 Volume    51 
2Author    G. Erd GädeRequires cookie*
 Title    The Revolution in Insect Neuropeptides Illustrated by the Adipokinetic Hormone/Red Pigment-Concentrating Hormone Family of Peptides  
 Abstract    The last decade has seen a surge in the knowledge on primary structures of insect neuro­ peptides. Particularly successful were isolations and sequence determinations of more than 30 members of the adipokinetic horm one/red pigment-concentrating hormone (A K H /R P C H) family of peptides. This brief overview describes the techniques used to obtain data on purifi­ cation and structure such as high performance liquid chromatography, Edman sequencing and mass spectrometry. M oreover, a short account on the precursors and on the multiple functions of the peptides of the A K H /R P C H family in various crustacean and insect species is given. 
  Reference    Z. Naturforsch. 51c, 607 (1996); received April 8 /July 2 1996 
  Published    1996 
  Keywords    Insect Neuropeptides, R P -H P L C, Edm an Degradation, Mass Spectrometry, Bioassays 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0607.pdf 
 Identifier    ZNC-1996-51c-0607 
 Volume    51