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Volume 28 (164)
Volume 29 (184)
Volume 30 (178)
Volume 31 (164)
Volume 32 (187)
Volume 33 (180)
Volume 34 (244)
Volume 35 (201)
Volume 36 (198)
Volume 37 (207)
Volume 38 (194)
Volume 39 (230)
Volume 40 (179)
Volume 41 (189)
Volume 42 (238)
Volume 43 (156)
Volume 44 (172)
Volume 45 (204)
Volume 46 (171)
Volume 47 (150)
Volume 48 (158)
Volume 49 (134)
Volume 50 (131)
Volume 51 (129)
Volume 52 (132)
Volume 53 (147)
Volume 54 (170)
Volume 55 (150)
Volume 56 (183)
Publication Year
2001 (183)
2000 (150)
1999 (170)
1998 (147)
1997 (132)
1996 (129)
1995 (131)
1994 (134)
1993 (158)
1992 (150)
101Author    S. De Boeck, T. Rymen, J. StockxRequires cookie*
 Title    6,8-D ihydroxypurine in the H en's Egg Y olk  
 Abstract    6,8-Dihydroxypurine, egg yolk, purine metabolism During an investigation on nucleic acid catabo­ lism in chicken eggs, we were able to identify several purine and pyrim idine derivatives in white and yolk 1. Isolation of these products from yolk ( 
  Reference    (Z. Naturforsch. 28c, 477 [1973]; received April 24 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0477_n 
 Volume    28 
102Author    H. Elfried NitscheRequires cookie*
 Title    Die Struktur von Mimulaxanthin The Structure of M imulaxanthin  
 Abstract    Diallenic carotenoid, allene-acetylene transformation Mimulaxanthin, a xanthophyll from the petals of Mimulus guttatus (Monkey flower), has the structure of a öJ.ö'^'-tetradehydro-SAS'jö'-tetrahydro^ytf-carotene-S.SjS'.S'-tetrol. This was con­ firmed by mass, nuclear magnetic resonance (NMR) and infrared (IR) spectra. The pigment yielded a diacetate, diacetate-di (trimethylsilyl)-ether, and a diether with acidified methanol. The free or acetylated pigment was transformed into the diacetylenic xanthophyll alloxanthin (7,8,7',8'-tetra-dehydro-/?,/?-carotene-3,3'-diol) or alloxanthin-diacetate with acidic acetone. 
  Reference    (Z. Naturforsch. 28c, 481—487 [1973]; eingegangen am 18. Juni/11. Juli 1973) 
  Published    1973 
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 TEI-XML for    default:Reihe_C/28/ZNC-1973-28c-0481.pdf 
 Identifier    ZNC-1973-28c-0481 
 Volume    28 
103Author    Friedrich Drawert, Roland Tressl, Günter Staudt, Hans KöpplerRequires cookie*
 Title    Gaschromatographisch-massenspektrometrische Differenzierung von Erdbeerarten Gaschromatographical-masspectrometrical Differentiation of Aroma Substances from Strawberries  
 Abstract    Gasdiromatographical-masspectrometrical differentiation, aroma substances, strawberries Ripe fruits of wild growing varieties of strawberries had been homogenized under inhibition of the enzymes and extracted with the adding of an internal standard. About 40 main components could be identified and quantitatively determined by gaschromatographical-mass-spectrometrical investigations. Methyl ketones and secondary alcohols dominate in Fragaria moschata and Fragaria vesca, whereas especially ethylesters of the carboxylic acids C6 to CJ2 are formed by Fragaria chiloensis. Fragaria virginiana contains numerous components amongst which are especially the methyl-and ethylesters of the carboxylic acids C6 to C12; besides it contains, as distinctive marks, n-butyl-, n-hexyl, ra-octyl, and n-decylesters of the carboxylic acids C4 to C10 . All varieties exhibit a sorttypical distribution pattern of the aroma components. 
  Reference    (Z. Naturforsch. 28c, 488 [1973]; eingegangen am 16. Juni 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0488 
 Volume    28 
104Author    Wolfgang Schimmack, Wolfgang LohmannRequires cookie*
 Title    Hydrogen Bonds between Sexual Hormones and Nucleobases: NMR Investigations  
 Abstract    Hydrogen bonds, sexual hormones, nucleobases, NMR spectroscopy, thermodynamic parameters 
  Reference    (Z. Naturforsch. 28c, 494 [1973]; received March 22 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0494 
 Volume    28 
105Author    H. Budzikiewicz, J. Rullkötter, E. HeinzRequires cookie*
 Title    Massenspektroskopische Untersuchungen an Glycosylglyceriden Mass Spectrometric Investigation of Glycosyl Glycerides  
 Abstract    Mass spectrometry, glycosyl glycerides 
  Reference    (Z. Naturforsch. 28c, 499 [1973]; eingegangen am 18. April 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0499 
 Volume    28 
106Author    Peter Böger, StephenS. Lien, Anthony San, PietroRequires cookie*
 Title    Fluorescence Studies on Ferredoxin-NADP Reductase  
 Abstract    Ferredoxin-NADP reductase, fluorescence, NADP/ferredoxin interaction With highly purified preparations of ferredoxin-NADP reductase (EC 1.6.99.4; also EC 1.6.1.1) from spinach chloroplasts a strong flavin fluorescence was observed (excitation at 450 nm). At pH 7.0, the fluorescence was approximately 40% higher than that of free FAD. Pure reductase from the heterokont alga Bumilleriopsis had only a fluorescence of less than 5% of that of the spinach protein. Essentially the same low fluorescence was found with impure spinach reductase preparations. The low-fluorescent samples of both species exhibited about the same quenching response to salts and buffers which differed from the highly fluorescent spinach flavoprotein preparation. The low fluorescence of the algal protein could be enhanced by NADP, but not by ferredoxin. Maximum fluorescence increase was observed when reductase and NADP were present in a 1:1 molar ratio. Ferredoxin did not counteract the reductase are hereby substantiated. 
  Reference    (Z. Naturforsch. 28c, 505 [1973]; received June 9 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0505 
 Volume    28 
107Author    Jorgen Lou, K. S. BirdiRequires cookie*
 Title    Interaction of Bilirubin with Human Serum Albumin and Cationic Detergents  
 Abstract    Bilirubin, albumin, detergent, interaction Bilirubin shows a red-shift in the visual spectra on binding to albumin. In bilirubin-cationic detergent systems a similar spectral change was observed. These comparisons allow one to deduce that the environment of the binding site in albumin is most likely apolar than when bilirubin is solubilized by the cationic detergents. 
  Reference    (Z. Naturforsch. 28c, 511—513 [1973]; received April 2 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0511 
 Volume    28 
108Author    L. Bornmann, H. Busse, B. HessRequires cookie*
 Title    Oscillatory Oxidation of Malonic Acid by Bromate 3. C 02 and B r0 3--Titration  
 Abstract    Oscillation, malonic acid, bromate, oxidation, reaction pathway The reaction of malonic acid and bromate in the presence of catalytic amounts of cerious ion under oscillating conditions in sulphuric acid was investigated. After two hours reaction time 26 mM bromate were consumed and 42 mM C 0 2 produced. No formic acid was detected. Furthermore, 14C-tracer experiments suggest that malonic acid is first brominated and subsequently decarboxylated. 
  Reference    (Z. Naturforsch. 28c, 514 [1973]; received June 18 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0514 
 Volume    28 
109Author    Kanzerogenität, FritzA. PoppRequires cookie*
 Title    Ein Zusammenhang zwischen Anregungszuständen von Molekülen und biologischer Wirkung, wie Strahlensensibilisierung A Correlation between the Properties of Excited States of Molecules and Biological Activity, as Radiosensibilization and Carcinogenic Activity  
 Abstract    Radiosensibilization, carcinogenic activity 
  Reference    (Z. Naturforsch. 28c, 517 [1973]; eingegangen am 10. Mai 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0517 
 Volume    28 
110Author    Wolfgang Flossmann, Jürgen Hüttermann, Adolf Müller, Eric WesthofRequires cookie*
 Title    Electron Spin Resonance of Free Radicals and Radical Pairs in Irradiated Single Crystal of 1-Methyluracil  
 Abstract    Free radicals, radical pairs, 1-methyluracil, monocrystal, ESR-spectra Radical formation by irradiation with X-rays in single crystals of 1-methyluracil has been mea­ sured using ESR-spectroscopy at 9.5 GHz and 35 GHz. When irradiating and measuring at 77 °K radicals characterized by hydrogen abstraction from the methyl group were found to be pre­ dominating. For the hyperfine splittings principal values of 8.5 G, 18.2 G, 30.5 G were found for 
  Reference    (Z. Naturforsch. 28c, 523 [1973]; received April 4 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0523 
 Volume    28 
111Author    Lothar Rafflenbeul, Wa-Ming Pang, Hansjürgen Schönert, Klaus HaberleRequires cookie*
 Title    Zur Thermodynamik der hydrophoben Wechselwirkung; die Systeme Wasser + Glycin+ Harnstoff und Wasser + Alanin+ Harnstoff bei 25 °C Thermodynamics of Hydrophobie Interaction in the Systems Water + Glycin + Urea and Water + Alanin + Urea at 25 °C  
 Abstract    Hydrophobie interaction, thermodynamic properties Isopiestic vapor pressure measurements and calorimetric determination of the heat of dilution have been performed and evaluated with respect to enthalpy, entropy and free enthalpy in the ternary solutions w ater+ glycin+ urea and water+ alanin + urea. The free enthalpy of transfer for the process: Amino acid from water to water+ urea, which can be derived from these measurements, does not agree with the value calculated from solubility measurements. The reason for this discre­ pancy and the values of entropy and enthalpy in terms of hydrophobic interaction are discussed. Supplementary measurements of the proton magnetic resonance in these solutions are included. 
  Reference    (Z. Naturforsch. 28c, 533 [1973]; eingegangen am 2. Mai 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0533 
 Volume    28 
112Author    H.-P Haschke, U. LüttgeRequires cookie*
 Title    ß-Indolylessigsäure-(IES)-abhängiger K +-H +-Austauschmechanismus und Streckungswachstum bei ^e/^-Koleoptilen A /3-Indole Acetic Acid (IAA) Dependent K+-H+-Exchange Mechanism as Related to Growth of Avena Coleoptiles  
 Abstract    In toleacetic acid, A vena coleoptiles, K+-H+ ion exchange pump, growth yS-Indole acetic acid (IAA) (1 0 -7 — 1 0 —5 m) enhanced elongation of A ven a coleop tiles is shown to be correlated w ith increased K+ net influx and H + net efflux. The data suggest a 1:1 exchange of K + and H +. It is su ggested that an IAA controlled K+-H+-exdiange pump is involved in IA A regula­ tion of elongation. 
  Reference    (Z. Naturforsch. 28c, 555 [1973]; eingegangen am 16. M ai/27. Juni 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0555 
 Volume    28 
113Author    H. Drum, H. M. OhrRequires cookie*
 Title    Control by Phytochrome of Glutathione Reductase Levels in the Mustard Seedling  
 Abstract    Phytochrome, glutathione reductase, isoenzym es, mustard seed lin g The time-courses of the level of glutathione reductase (G R ; EC 1.6.4.2) were follow ed in cotyle­ dons and hypocotyl of the developing mustard seed lin g in the dark and under the influence of ligh t (phytochrom e). Localization of GR on polyacrylam ide disc electrophoresis colum ns indicate that 2 isoenzym es of GR are present in both organs under all experim ental conditions. GR can be induced by ligh t (phytochrome) in the cotyled on s; however, there is no influence of light (phyto­ chrome) on the time-course of the level of GR in the hypocotyl. W hile the actual lag-phase of the response in the cotyledons is less than 6 hours (onset of ligh t at 48 hours) there is no detectable effect of ligh t on apparent GR synthesis before approx. 42 hours after sow ing. Irrespective of the onset of ligh t (at 24 or 36 hours after sow ing) the tim e-course of the enzym e level remains precisely the sam e. A red pulse given at 24 hours after sow ing leads to an increase of the enzyme level as determ ined 60 hours later. T he effect of the red pulse is fully reversed by a far-red ligh t pulse given at 24 hours but not 12 hours later. Facts of this kind have led to the concept of a stable inter­ mediate in the chain of regulatory events betw een phytochrome (P fr) and GR increase. No in d i­ cations of a coordinated, sim ultaneous induction by phytochrom e of GR and ascorbate oxidase (AO) could be found. This result does not support the concept that a respiratory chain exists in which AO functions as a term inal oxidase. 
  Reference    (Z. Naturforsch. 28c, 559 [1973]; received May 21 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0559 
 Volume    28 
114Author    M. Aria, Dolores Sacristán, Ingeborg DobrigkeitRequires cookie*
 Title    Variable Content of a (GC) Rich Satellite DNA in Tumorous and Normal Cultures of Crepis capillaris  
 Abstract    Satellite D N A , crown-gall tumors A nalyses of D N A from tum orous and non tumorous cultures of C repis capillaris by analytical equilibrium centrifugation in a neutral CsCl gradient revealed significant differences in regard to the content of a heavy com ponent satellite, which was more highly represented in tumorous cultures. D N A of plant leaves showed a unim odal distribution of m olecules. The choice of suitable controls served to dem onstrate that the com ponent satellite was not exclusive of tumorous tissues. The higher satellite content of tumorous cultures is probable related to their higher growth rate. 
  Reference    (Z. Naturforsch. 28c, 564 [1973]; received May 25 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0564 
 Volume    28 
115Author    Antonio Fernandez Perez De TalensRequires cookie*
 Title    Cloe Taddei-Ferretti  
 Abstract    Landing behaviour, M u sca dom estica, optomotor reaction, monocular vision, m ovement perception 1. T he house fly shows landing reaction to an expanding visual stim ulus or to a decrem ent of the environm ental ligh t level. T he quantitative relationship between the dependence of landing reaction on expansion and on light level decrem ent is analyzed. 2. T he different properties of the reactions at different light levels may be correlated w ith the two visual system s in Diptera and m ay be explained by the existence of an alterting mechanism that w eigh s stim uli for landing reaction at low illum ination levels. 3. T he landing reaction resem bles the optomotor reaction with respect to the influence of the contrast of the stim ulating pattern. T he landing reaction appears to be invariant to the phase relations between the spatial com ponents of the periodic patterns used in the present experim ents. I n tro d u c tio n 
  Reference    (Z. Naturforsch. 28c, 568 [1973]; received September 18 1972/M arch 22 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0568 
 Volume    28 
116Author    Laboratorio Di, C. Ib, Em Etica, D. El, C.N R, A. Rco, F. Elice, Napoli, Italy, Antonio Fernandez Perez De TalensRequires cookie*
 Title    Cloe Taddei-Ferretti  
 Abstract    Landing behaviour, M u sca dom estica, optom otor reaction, lum inous Stimulation, compound eye 1. T he behaviours of m onocular and binocular flies are compared with respect to the landing reaction. It is found that lan d ing reaction is elicited through different m echanisms by stim ulating the zones of single or of double vision: M onocular stim ulation in the field of sin gle vision evokes reactions w ith both ip silateral and contralateral leg s; m onocular stim ulation in the field of double vision evokes reaction only w ith the ipsilateral legs. 2. T he relationships betw een landing and optom otor reactions are analyzed. It is found that, a. W hen the fly is not free to turn itself, it may react to a lateral displacem ent in the visual field (optomotor stim ulus) w ith a landing reaction ; b. T h e threshold for landing evoked by an ex ­ pansion in the visual field (landing stim ulus) is much low er than the threshold for landing evoked by a lateral displacem ent; c. A horizontal lateral d isplacem ent in the visual field of an eye is adequate to evoke the lan d ing reaction on ly if it is perceived in the direction from the front to the back of the eye; d. W hen the fly is free to turn itself, it can present both landing and opto­ motor reactions to a optom otor stim ulus; e. W hen the fly is fixed at a point, landing reaction can be evoked also by an escap e stim ulus. 
  Reference    (Z. Naturforsch. 28c, 579 [1973]; received Septem ber 1 8 1972/M arch 2 2 1 9 7 3) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0579 
 Volume    28 
117Author    R. HengstenbergRequires cookie*
 Title    The Effect of Pattern Movement on the Impulse Activity of the Cervical Connective of Drosophila melanogaster  
 Abstract    D rosophila, vision, electrophysiology, cervical connective, m ovement detection A ction p otentials of som e of the 3578 nerve fibres in the cervical connective of D rosophila m elan ogaster can be recorded with extracellular electrodes. The spike rate increases if moving striped patterns are presented to the compound eyes, especially with horizontal front-to-back m ove­ ment. The response is sm all or absent with the reverse (or with vertical) directions of movement. The m ain properties of this response are described, and briefly discussed. 
  Reference    (Z. Naturforsch. 28c, 593 [1973]; received A ugust 1 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0593 
 Volume    28 
118Author    ChristofC. Krischer, D. HuppRequires cookie*
 Title    Measurement of a Steady State Current in the Dark in Photoreceptors of the Barnacle  
 Abstract    Barnacle, photoreceptors, dark current Receptor potentials are measured extracellu larly by m eans of an air gap m ethod along the optic nerve of the m edian and the lateral photoreceptor of th e barnacle. Both photoreceptors have an outward dark current (photoreceptor positive w ith respect to the nerve) which is dim inished ap­ proxim ately 70% during the plateau phase of the receptor p otential. Ouabain abolishes dark current and receptor potential in the sam e proportion. W ith a L im u lu s lateral eye preparation a dark cur­ rent and lig h t induced current changes were m easured which had the sam e polarity and a sim ilar m agnitude as the receptor currents of the barnacle. 
  Reference    (Z. Naturforsch. 28c, 597 [1973]; received June 21 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0597 
 Volume    28 
119Author    H. Ennig Stieve, M.Anfred Wilms, Gottfried NollRequires cookie*
 Title    Measurements on the pH Dependence of Metarhodopsin Reactions in Sonicated Rod Outer Segments  
 Abstract    R hodopsin, flash p hotolysis, sonication, pH T h e kinetics of rhodopsin photolysis in sonicated suspensions of rod outer segments (R O S), unsonicated ROS suspensions and rhodopsin detergent solutions were com pared. No significant kin etic differences were d etected ; however, the energy of activation for the metarhodopsin I to m etarhodopsin II reaction was som ewhat higher in sonicated ROS suspensions than in the un­ sonicated suspensions. W h ile the sonicated preparations contained glycerol, it was not possible to show a chem ical influence of glycerol on the reactions of the rhodopsin decay. An often assumed effect that the ROS outer m em brane acts as a barrier toward diffusion of protons could not be confirmed. 
  Reference    (Z. Naturforsch. 28c, 600 [1973]; received June 21 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0600 
 Volume    28 
120Author    DieterF. Hülser, Anthony DemseyRequires cookie*
 Title    Gap and Low-Resistance Junctions between Cells in Culture  
 Abstract    C ell cultures, low -resistance junction, gap junction, intercellular com m unication, freeze fracture Established lin es of both fibroblastoid and epithelioid cells have been investigated by electro-p h ysiological and freeze-fracture m ethods. Between the ion ically coupled (by "low-resistance ju n c­ tion s") fibroblastoid cells numerous gap junctions were found. Betw een the non-coupled epithelioid cells gap jun ction s could not be detected. 
  Reference    (Z. Naturforsch. 28c, 603 [1973]; received July 17 1973) 
  Published    1973 
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 TEI-XML for    default:Reihe_C/28/ZNC-1973-28c-0603.pdf 
 Identifier    ZNC-1973-28c-0603 
 Volume    28 
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