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'Phospholipids' in keywords Facet   Publication Year 1981  [X]
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1981[X]
1Author    Dieter StrackRequires cookie*
 Title    Sinapine as a Supply of Choline for the Biosynthesis of Phosphatidylcholine in Raphanus sativus Seedlings  
 Abstract    Biosynthesis o f phosphatidylcholine in young seedlings o f Raphanus sativus is supplied with choline from degradation of the seed constituent sinapine (sinapoylcholine). This conclusion has been deduced from the following results: (1) Raphanus sativus seedlings accumulate approx. 70 nmol phosphatidylcholine which may be relevant for the consumption of choline, liberated during hydrolysis of approx. 130 nmol sinapine. (2) [14C]choline and [14C]ethanolamine, taken up by germinating Raphanus seeds, are exclu­ sively consumed in the biosynthesis o f phosphatidylcholine and phosphatidylethanolamine, respectively. (3) Pulse-chase experiments with seedlings at different germination stages show a reduced [14C]choline incorporation into phosphatidylcholine at the time when degradation o f sinapine occurs, obviously as a result of an isotope dilution by an increase o f the endogenous choline pool. (4) After [14C]choline pulse to immature seeds, during the process o f seed maturation most of the activity taken up is incorporated into accumulating sinapine and approx. 50% compared to this into phosphatidylcholine. During seedling development the quantity o f labelled sinapine rapidly decreases as a result of sinapine degradation with a concomitant label increase in free choline, phosphorylcholine, and phosphatidylcholine. Approx. 50% of the choline liberated from sinapine, is consumed in the biosynthesis of phosphatidylcholine. High performance liquid chromatographic analyses of phosphatidylcholine during Raphanus germination revealed that this phospholipid might be a metabolically active compound. Changes in the absorptivity of this compound at 210 nm indicate changes in the degree of unsaturation in the fatty acyl groups. 
  Reference    Z. Naturforsch. 36c, 215—221 (1981); received December 231980 
  Published    1981 
  Keywords    Sinapine, Phosphatidylcholine, Phenylpropanoids, Phospholipids, Raphanus, Brassicaceae 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0215.pdf 
 Identifier    ZNC-1981-36c-0215 
 Volume    36 
2Author    M. Suwalsky, J. TapiaRequires cookie*
 Title    X-Ray Studies on Phospholipid Bilayers I. Polymorphic Forms of Dimyristoyl Lecithin  
 Abstract    A structural study o f the synthetic phospholipid, L-a-dimyristoyl lecithin (DM L), has been m ade by X-ray fiber diffraction methods. Three different types o f oriented specimens were prepared. They were X-ray photographed under the same conditions, including tem perature and relative humidity. T hree different types o f diffraction patterns, corresponding to different confor­ mations and/or packing arrangements, were found. They are characterized by their unit cell dimensions, space groups, molecular conformations, and packing arrangements. 
  Reference    Z. Naturforsch. 36c, 875—8 (1981); received April 13 1981 
  Published    1981 
  Keywords    Phospholipid, Bilayer, X-Ray D iffraction, Dimyristoyl Lecithin, M em brane 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0875.pdf 
 Identifier    ZNC-1981-36c-0875 
 Volume    36 
3Author    N. Weber, K. Wayss, M. Volm, IrmgardK. Iew Itt, K. D. MukherjeeRequires cookie*
 Title    Specific Positional Distribution of Acyl Moieties in Phospholipids is not Generally Deleted in Neoplastic Cells  
 Abstract    The distribution o f acyl moieties at sn-1 and sn-2 positions of cholinephosphoglycerides (CPG) and ethanolaminephosphoglycerides (EPG) has been determined for neurosarcoma, sarcoma 180 and leukemia L 1210. In all the three samples, the positional distribution o f acyl moieties in the two major classes o f phospholipids is found to be similar to that in cellular phospholipids o f most mammalian tissues. The saturated acyl moieties are located predominantly at sn-1 and polyunsaturated acyl moieties at sn-2, whereas the monounsaturated acyl moieties are randomly distributed between these two positions. Apparently, a disruption of specific positioning o f acyl moieties in phospholipids, which hitherto has been in neoplasia, does not exist in all neoplastic cells. 
  Reference    Z. Naturforsch. 36c, 81—8 (1981); received September 26 1980 
  Published    1981 
  Keywords    Positional Distribution o f Acyl Moieties, Phospholipids, Neurosarcoma, Sarcoma 180, Leukemia L 1210 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0081.pdf 
 Identifier    ZNC-1981-36c-0081 
 Volume    36