ZfN: Search Results

1	Author	Framboise Techy, Monique Dinant, Jacques Aghion	Requires cookie*
	Title	Interactions between Photosynthetic Pigments Bound to Lipid and Protein Particles. Spectroscopic Properties
	Abstract	The spectroscopic (visible) properties of pigment-bearing lipid and protein particles extract ed from milk show that: 1) chlorophylls a and b bound to separate particles can form aggregates provided their relative concentration is high enough. Neither pheophytin a nor ^-carotene, in the same conditions, form observable aggregates. 2) Chlorophylls a and b can co-aggregate when they are bound to the same particles. Pheophytin a as well as /8-carotene seem to prevent the aggregation of chlorophyll a. p-carotene has no effect on the aggregation of chlorophyll b.
	Reference	Z. Naturforsch. 34c, 582—587 (1979); received December 15 1978/April 9 1979
	Published	1979
	Keywords	Spectroscopy, Photosynthetic Pigments, Artificial Membranes
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	TEI-XML for	default:Reihe_C/34/ZNC-1979-34c-0582.pdf
	Identifier	ZNC-1979-34c-0582
	Volume	34

2	Author	T. Hom As Brandlm, Hugo Scheer, W. Olfhart Rüdiger	Requires cookie*
	Title	Chromophore Content and Molar Absorptivity of Phytochrome in the Pr Form
	Abstract	Quantitative absorption spectra in the visible and UV region were recorded for denaturated phytochrome (P r) and phytochromobilin peptides in comparison with native Pr. The method was tested with C-phycocyanin from Spirulina platensis. Based on known molar absorptivities for denaturated phycocyanin and suitable model compounds, and on the ratio ^niüve/^delrS = 2.9, ^native was determined to be 1 0 2 0 0 0 m _1 cm-1 for one phycocyanobilin chromophore in native phycocyanin. Likewise, N a t iv e was calculated to be 19000 M -1 cm-1. The corresponding ratios for Pr Were ^native/^denatured = 3*4 and A native/-^degraded = 3.7, t h l S yielded ^native = 109000 tO 118000 and eSUfcve = 36000 M _1 cm-1 for phytochromobilin in native P r. This value corresponds to one phytochromobilin per small phytochrome (60000 D) if data from the literature are corrected for the content o f colorless proteins. The latter has been asessed from (i) the purity index (A2g0/A665) and (ii) the contribution o f the phytochromobilin chromophore at 280 nm as derived from model compounds.
	Reference	Z. Naturforsch. 36c, 431 (1981); received February 20 1981
	Published	1981
	Keywords	Absorption, Spectroscopy, A-Dihydrobilindiones, Isophorcabilin, Phycobiliproteins, Phytochrome, Phytochromobilin-Peptides
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	TEI-XML for	default:Reihe_C/36/ZNC-1981-36c-0431.pdf
	Identifier	ZNC-1981-36c-0431
	Volume	36

3	Author	Hans-Peter Köst, Eva Benedikt, Edmund Cmiel, Siegfried Schneider	Requires cookie*
	Title	5N-Coprobiliverdin, a New Model Chromophore
	Abstract	The synthesis of l5N-labeled coprobiliverdin III, a bile pigm ent with four conjugated pyrrole nuclei and four carboxylic acid side chains, is described. C oprobiliverdin is structurally characterized by chemical and various spectroscopic m ethods (e.g. chrom ic acid degradation, UV-vis-, IR-, mass spectroscopy). The results of 15N N M R studies reveal the potential value of this compound as a probe for structural interactions in biliproteins and as a reference for the future investigation of natural bile pigments deriving
	Reference	Z. Naturforsch. 38c, 943 (1983); received July 7 1983
	Published	1983
	Keywords	Natural Bile Pigments, Coprobiliverdin III, Model C hrom ophore, Spectroscopy, MO-Calculations
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	TEI-XML for	default:Reihe_C/38/ZNC-1983-38c-0943.pdf
	Identifier	ZNC-1983-38c-0943
	Volume	38