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Facet   Publication Year 1994  [X]
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1994[X]
21Author    M. Auro Sola-Penna, A.Dalberto Vieyra, JoseR. Oberto, M. Eyer-FernandesRequires cookie*
 Title    Uncoupling by Trehalose of Ca2+ Transport and ATP Hydrolysis by the Plasma Membrane (Ca2++Mg2+) ATPase of Kidney Tubules  
 Abstract    Uncoupling, (Ca2++Mg2+)ATPase, Ca2+ Transport, Phospholipid Environment, Trehalose Trehalose, the disaccharide of glucose, inhibits both initial rate and maximal capacity of ATP-dependent Ca2+ transport in inside-out vesicles of basolateral membrane from kidney proximal tubules. This inhibition (/05 = 60 mM) cannot be attributed to an increase in Ca2+ permeability, since the rate of EGTA-stimulated Ca2+ efflux from preloaded vesicles is not modified by trehalose. In the presence of 600 mM trehalose, Ca2+ uptake was almost com­ pletely inhibited, but the Ca2+-stimulated ATPase activity was unaffected; thus trehalose uncouples the Ca2+ transport from the ATPase activity. The Ca2+ transport inhibition by tre­ halose is reversible, since the inhibition disappeared when the vesicles were pre-incubated with 600 m M trehalose and then diluted in reaction medium to measure Ca2+ accumulation. Other mono-and disaccharides such as glucose, fructose, galactose, sucrose, maltose and lactose were tested but were not so effective as trehalose. The uncoupling of Ca2+ transport from hydrolysis can be explained by an interaction of trehalose with the phospholipid environ­ ment of the enzyme that induces conformational changes in specific domains of the enzyme so as to impair the coupling process. 
  Reference    Z. Naturforsch. 49c, 141—146 (1994); received September 271993 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0141.pdf 
 Identifier    ZNC-1994-49c-0141 
 Volume    49 
22Author    HaripalsinghM. Sonawat, Shunji Yamamoto, D. Ieter LeibfritzRequires cookie*
 Title    31P NMR Studies on Perfused Liver from Mouse with Chronic Ethanol Ingestion  
 Abstract    Molecular Cell Biology, Metabolism Changes in the levels of phosphate metabolites as affected by acute ethanol administra­ tion and chronic ethanol ingestion were investigated in perfused mouse liver by 31P NMR spectroscopy. Acute ethanol administration decreases intracellular P, and the P/ATP ratio, and increases phosphomonoester levels in normal-fed animals. No such change was observed in the liver from ethanol-fed mice. Chronic ethanol ingestion renders the liver more prone to ischemia-induced changes in ATP, intracellular P, and phosphomonoesters. The P/ATP ratio increases fivefold in control mice and fourfold in alcohol-fed mice when ischemia is induced in the presence of ethanol. Intracellular pH of 7.45 ± 0.05 is not affected by ethanol perfusion. Cellular acidosis resulting from ischemia in the presence or absence of alcohol was similar. However, longer period of ischemia leads to an additional 0.11 unit drop in pH in the presence of ethanol. 
  Reference    Z. Naturforsch. 49c, 147—153 (1994); received October 18/November 181993 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0147.pdf 
 Identifier    ZNC-1994-49c-0147 
 Volume    49 
23Author    ElenaT. Tsankova, A. Ntoaneta, B. TrendafilovaRequires cookie*
 Title    Xanthanolides of Xanthium italicum Moretti and Their Biological Activity  
  Reference    Z. Naturforsch. 49c, 154 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0154_n.pdf 
 Identifier    ZNC-1994-49c-0154_n 
 Volume    49 
24Author    K. Y. Am Ano, H. ShirahamaRequires cookie*
 Title    The Structure of a New Dipeptide from the Mushroom Clitocybe acromelalga  
 Abstract    D ep artm en t o f C hem istry, Faculty o f Science, H o k k aid o U niversity, S a p p o ro 060, Jap a n 
  Reference    Z. Naturforsch. 49c, 157 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0157.pdf 
 Identifier    ZNC-1994-49c-0157 
 Volume    49 
25Author    Birgit Fuchs, Petra Suttner, Sabine Sterner, R.Requires cookie*
 Title    Disproportionating Transglycosylase (D-Enzyme) in Green Algae and Cyanobacteria. Partial Purification and Characterization  
 Abstract    obert W astlhuber and Eckhard Loos L ehrstuhl für Zellbiologie u n d P flanzenphysiologie, U n iv ersität R egensburg, D-93040 R egensburg, B undesrepublik D eutschland 
  Reference    Z. Naturforsch. 49c, 163 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0163.pdf 
 Identifier    ZNC-1994-49c-0163 
 Volume    49 
26Author    U. Schmieden, A. WildRequires cookie*
 Title    Changes in Levels of a-Tocopherol and Ascorbate in Spruce Needles at Three Low Mountain Sites Exposed to M g2+-Deficiency and Ozone  
  Reference    Z. Naturforsch. 49c, 171 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0171.pdf 
 Identifier    ZNC-1994-49c-0171 
 Volume    49 
27Author    Kiriakos Kotzabasis, Horst SengerRequires cookie*
 Title    Free, Conjugated and Bound Polyamines during the Ceil Cycle in Synchronized Cultures of Scenedesmus obliquus  
 Abstract    The levels of free, conjugated and bound polyamines (PA) were analyzed during the cell cycle of the synchronized unicellular green alga Scenedesmus obliquus. The polyamines putrescine (PUT) and spermidine (SPD) in their free and conjugated forms accumulated per cell to a maximum in the cell cycle at about the 16 th hour after onset of illumination. The polyamines bound to macromolecules and membrane systems showed an additional peak around the 8-10 th hour of the cell cycle. The possible role of the different forms of poly­ amines in DNA replication, mitosis, cell division and development of the photosynthetic apparatus is discussed. 
  Reference    Z. Naturforsch. 49c, 181—185 (1994); received December 31993 
  Published    1994 
  Keywords    Cell Cycle, Polyamines, Putrescine, Spermidine, Scenedesmus 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0181.pdf 
 Identifier    ZNC-1994-49c-0181 
 Volume    49 
28Author    Jutta Thiem, Wolfgang BarzRequires cookie*
 Title    Photoautotrophic Chenopodium rubrum Cell Suspension Cultures Resistant against Photosynthesis-Inhibiting Herbicides I. Selection and Characterization  
 Abstract    For establishing metribuzin-resistant, photoautotrophic Chenopodium rubrum cell cul­ tures plated cells, callus cultures or suspension cultures were subjected to selection proce­ dures. The most effective procedure was the stepwise increase in the concentration of the herbicide from 0.01 ^im to 10 ^im in suspension cultures, which resulted in the isolation of eight different metribuzin-resistant photoautotrophic cell lines. Conjugation metabolism or a decrease in the uptake and translocation of the selective agent were not responsible for resist­ ance, which was stable in the absence of the inhibitor over numerous growth cycles. Meas­ urements of the photosynthetic electron transport, analyses of fluorescence induction kinetics and determination of the binding properties of 14C-labelled metribuzin to isolated thylakoids indicated that resistance of the cell lines is based on an alteration in the photosystem II her­ bicide-binding protein (D 1 protein). RFLP analysis of the psbA gene of the eight resistant cell lines demonstrated that none of them possess an amino acid exchange in position 264 of the D 1 protein leading to altered herbicide-binding properties. 
  Reference    Z. Naturforsch. 49c, 186—194 (1994); received June 25/December 161993 
  Published    1994 
  Keywords    Herbicide Resistance, Selection Mechanism, Photoautotrophic Cell Culture, Chenopodium rubrum 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0186.pdf 
 Identifier    ZNC-1994-49c-0186 
 Volume    49 
29Author    Francisco Garcia-Garcia, Elmon Schmelzer, Klaus HahlbrockRequires cookie*
 Title    Differential Expression of Chitinase and ß-l,3-Glucanase Genes in Various Tissues of Potato Plants  
 Abstract    M ax-P lanck-Institut für Z ü ch tu n g sfo rsch u n g , A bteilung Biochem ie, C arl-von-L inne-W eg 10, D-50829 K öln 30, B undesrepublik D eu tsch lan d and Robert Roxby 
  Reference    Z. Naturforsch. 49c, 195 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0195.pdf 
 Identifier    ZNC-1994-49c-0195 
 Volume    49 
30Author    Susanne Bickel-Sandkötter, K. Ordula EsserRequires cookie*
 Title    7-Chloro-4-nitrobenzofurazan Inactivates Chloroplast H +-ATPase by Modification of Different Tyrosines, Depending on the Presence of ATP  
  Reference    Z. Naturforsch. 49c, 204 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0204.pdf 
 Identifier    ZNC-1994-49c-0204 
 Volume    49 
31Author    Per Villand, LeszekA. KleczkowskiRequires cookie*
 Title    Is There an Alternative Pathway for Starch Biosynthesis in Cereal Seeds?  
 Abstract    Plant M olecular Biology L a b o ra to ry , A gricultural R esearch C ouncil o f N orw ay, P.O . Box 51, 1432 A as, N orw ay Z. N atu rfo rsch . 49c, 2 1 5 -2 1 9 (1994); received D ecem ber 8 , 1993 A D P -G lucose P yropho sp h o ry lase, Hordeum vulgare, Seed E ndosperm , Starch B iosynthesis A hypothesis is presented concerning a putativ e extra-am yloplastic lo cation o f barley seed endosperm A D P-glucose p y ro p h o sp h o ry lase (A G Pase), a key enzyme o f starch biosynthesis. The hypothesis is based b o th on indirect an d direct evidence obtained in o u r la b o ra to ry as well as on d ata o f o th e r investigators. It is p roposed th a t A D P-glucose form ed by the extra-am yloplastic enzyme is tra n sp o rte d to the am yloplasts via an A D P-glucose carrier in th e plas-tid m em brane, and th en is utilized by the starch biosynthesizing m achinery o f these organelles. In ad d itio n to the extra-am y lo p lastic form o f A G Pase, barley endosperm contains also a sec­ ond isozym e o f A G P ase, located in the am yloplasts. Presence o f isozymes o f A G P ase in cereal seed endosperm is con sisten t w ith biochem ical, m olecular and genetic d a ta on starch biosyn­ thesis in this tissue. 
  Reference    Z. Naturforsch. 49c, 215 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0215.pdf 
 Identifier    ZNC-1994-49c-0215 
 Volume    49 
32Author    C. Tziatzios, P. Schuck, D. SchubertRequires cookie*
 Title    The Molar Mass of an Active Photosystem I Complex from the Cyanobacterium Synechococcus PCC 7002  
 Abstract    In stitu t für Biophysik d er J. W. G o eth e-U n iv ersität, T h eo d o r-S tern -K ai 7, H aus 74, D -60590 F ra n k fu rt am M ain, B undesrepublik D eutschland and G. Tsiotis 
  Reference    Z. Naturforsch. 49c, 220 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0220.pdf 
 Identifier    ZNC-1994-49c-0220 
 Volume    49 
33Author    Wolfgang Lohm, W.Bernhard Olf-, Dieter Schillb, Theofried Bucherb, M. Petersc, Andreas Artin Nillesb, Rainer Schulz0, BohledRequires cookie*
 Title    Elastosis and Cancer  
  Reference    Z. Naturforsch. 49c, 223 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0223.pdf 
 Identifier    ZNC-1994-49c-0223 
 Volume    49 
34Author    Petra Heidrich, Michael WinkRequires cookie*
 Title    Tawny Owl (Strix aluco) and Hume's Tawny Owl (Strix butleri) Are Distinct Species: Evidence from Nucleotide Sequences of the Cytochrome b Gene  
  Reference    Z. Naturforsch. 49c, 230 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0230.pdf 
 Identifier    ZNC-1994-49c-0230 
 Volume    49 
35Author    Marí, Tordera Marí, LuisaF. Errá Ndiz, M. Aría, José AlcarazRequires cookie*
 Title    Influence of Anti-Inflammatory Flavonoids on Degranulation and Arachidonic Acid Release in Rat Neutrophils  
 Abstract    D ep artam en to de F arm aco lo g ia de la U niversidad de Valencia, F acu ltad de F arm acia, A vda. Vicent Estelles s/n, 46100 B urjassot, V alencia, Spain Z. N aturforsch. 49c, 2 3 5 -2 4 0 (1994); received D ecem ber 30, 1993 F lavonoids, A n ti-In flam m ato ry Flavonoids, A rachidonic Acid, Lysosom al Enzym es, R at N eutrophil We assessed the effects o f 24 flavonoid derivatives, reported as anti-in flam m ato ry , on lyso­ som al enzym e secretion an d arach id o n ic acid release in ra t neutrophils. A m entoflavone, quer-cetagetin-7-O -glucoside, apigenin, fisetin, kaem pferol, luteolin an d quercetin were the m ost p o ten t inhibitors o f ß-glucuronidase and lysozyme release. The first co m p o u n d was also able to inhibit basal release. These flavonoids besides chrysin an d to a reduced extent, naringenin, significantly inhibited arach id o n ic acid release from m em branes. A co rrelatio n betw een de­ g ran u latio n and arach id o n ic acid release was found for this series o f com pounds. S tructure-activity relationships an d im plications for the anti-inflam m atory effects o f these flavonoids were discussed. 
  Reference    Z. Naturforsch. 49c, 235 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0235.pdf 
 Identifier    ZNC-1994-49c-0235 
 Volume    49 
36Author    K. Franke, H. GrulerRequires cookie*
 Title    Directed Cell Movement in Pulsed Electric Fields  
 Abstract    Human granulocytes exposed to pulsed electric guiding fields were investigated. The trajec­ tories were determined from digitized pictures (phase contrast). The basic results are: (i) No directed response was induced by pulsed electric guiding fields having a zero averaged field, (ii) A directed response was induced by pulsed electric guiding fields having a non-zero aver­ aged field, (iii) The directed response was enhanced for pulse sequencies having a repetition time of 8 s. (iv) The lag-time between signal recognition and cellular response was 8 -10 s. The results are discussed in the framework of a self-ignition model. 
  Reference    Z. Naturforsch. 49c, 241—249 (1994) 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0241.pdf 
 Identifier    ZNC-1994-49c-0241 
 Volume    49 
37Author    D. Girlich, H.-D LüdemannRequires cookie*
 Title    Molecular Mobility of the Water Molecules in Aqueous Sucrose Solutions, Studied by 2H-NMR Relaxation  
 Abstract    13/D ecem ber 2,1993 N M R, Sucrose, W ater, A queous Solution, Glass Transition D euteron spin lattice relaxation times Tx of sucrose/D20 solutions are given as function of tem perature, pressure, frequency and concentration. From the tem perature dependence of the 2H -T l the rotational dynamics of the hydrated sucrose complex and the w ater molecules are determ ined. For high pressure and high concentrations the tem perature dependence of the w ater molecules is described by a Vogel-Tam mann-Fulcher equation. The ideal glass tran ­ sition tem peratures T0H2° derived for the w ater molecules are at higher concentrations almost constant and smaller than the T0snc of the sugar molecules. 
  Reference    Z. Naturforsch. 49c, 250—257 (1994); received July 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0250.pdf 
 Identifier    ZNC-1994-49c-0250 
 Volume    49 
38Author    D. Girlich, H.-D Lüdemann, C. Buttersack, K. BuchholzRequires cookie*
 Title    c , T-Dependence of the Self Diffusion in Concentrated Aqueous Sucrose Solutions  
 Abstract    The self diffusion coefficients D of the water molecules and of sucrose have been deter­ mined by the pulsed field gradient NMR technique over a wide range of temperatures and concentrations (cmax: 70% w/w sue.). All temperature dependencies can be fitted to a Vogel-Tammann-Fulcher equation. The isothermic concentration dependence of D for the sucrose is given by a simple exponential concentration dependence. 
  Reference    Z. Naturforsch. 49c, 258—264 (1994); received December 21993 
  Published    1994 
  Keywords    Diffusion, Sucrose, Water, Aqueous Solution 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0258.pdf 
 Identifier    ZNC-1994-49c-0258 
 Volume    49 
39Author    José Antonio López-Sáez, Marí, Jose Pérez-Alonso, ArturoVelasco NegueruelaRequires cookie*
 Title    The Biflavonoid Pattern of Selaginella selaginoides  
 Abstract    Selaginellaceae, Selaginella selaginoides (L.) PB. ex Schrank & C.F.P. Mart., Biflavonoids From Selaginella selaginoides the following three biflavonoids were isolated: amentoflavone, hinoki-flavone and robustaflavone. The compounds were iden­ tified by means of spectroscopic methods. 
  Reference    Z. Naturforsch. 49c, 265—266 (1994); received November 121993 
  Published    1994 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0265_n.pdf 
 Identifier    ZNC-1994-49c-0265_n 
 Volume    49 
40Author    José Antonio López-Sáez, Marí, José Pérez-Alonso, ArturoVelasco NegueruelaRequires cookie*
 Title    Biflavonoids of Selaginella denticulata Growing in Spain  
  Reference    Z. Naturforsch. 49c, 267—270 (1994); received December 1 1993 
  Published    1994 
  Keywords    Selaginellaceae, Selaginella denticulata (L) Spring, Bifla­ vonoids 
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 TEI-XML for    default:Reihe_C/49/ZNC-1994-49c-0267_n.pdf 
 Identifier    ZNC-1994-49c-0267_n 
 Volume    49 
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