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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)
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2001 (183)
2000 (150)
1999 (170)
1998 (147)
1997 (132)
1996 (129)
1995 (131)
1994 (134)
1993 (158)
1992 (150)
61Author    R. WinklerRequires cookie*
 Title    Über die sogenannte denaturierende Wirkung von Elektrolyten und Nichtelektrolyten, geprüft an der von Konzentration und pH-Wert abhängigen Volumsveränderung des elastischen Gewebes On the So-called D enaturing Effect of Electrolytes and Non-electrolytes Shown by the Volume Changes of the Elastic Tissue Depending on Concentration and pH  
 Abstract    Fibrous proteins, elastin, iodide, urea, hydration The effects of the saccharides on the volume of elastin are primarily "dehydrating" or "osmotic" ones, those of J" and Cl-are primarily "electrostatic" ones, and the effect of urea is predominantly a "denaturing" one. 
  Reference    (Z. Naturforsch. 28c, 310 [1973]; eingegangen am 7. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0310 
 Volume    28 
62Author    Requires cookie*
 Title    Effect of Irradiation on Amino Acid in vitro Incorporation in the Course of Liver Regeneration  
 Abstract    B ist r a T a s h e v a , G e o r g e M a r k o v , a n d R o u m e n T s a n e v Biochemical Research Laboratory, Bulgarian A cadem y o f Sciences, Sofia, Bulgaria 
  Reference    (Z. Naturforsch. 28c, 313 [1973]) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0313 
 Volume    28 
63Author    Requires cookie*
 Title    A Multivariate Analysis of Ca-DTPA-Effectiveness in Removing 241 Am from the Rat  
 Abstract    241Am, C a-D T PA , rat The dependence on time of the dose-effect relationship was studied for the removal o f 241 Am from the skeleton and liver o f the rat by C a-D TPA . Due to the linearity of the dose-effect-curves (in a log-log scale) as well as to the linear dependence o f the slope on the logarithm of time, simple equations were derived which describe the m obilization o f 241Am as influenced by DTPA-dosage and time of treatment. 
  Reference    (Z. Naturforsch. 28c, 316 [1973]; received February 15 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0316 
 Volume    28 
64Author    Requires cookie*
 Title    Methode zur Differenzierung insulinähnlicher Aktivitäten am trypsin-behandelten Rattendiaphragma Method to Differentiate Insulin-like Activities in Rat-diaphragm W ieland Stock  
 Abstract    Trypsin, insulin-receptor, diaphragm, agmatin, L-arginin-V,V-diethylamide 
  Reference    (Z. Naturforsch. 28c, 319 [1973]; eingegangen am 6. Dezember 1972/5. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0319 
 Volume    28 
65Author    W. Erner, FrankRequires cookie*
 Title    VI. Calcium-und Kaliumionen als Cofaktoren Stim ulation of Em bryonic Rat Cells in Culture by Calf Serum VI. Calcium and Potassium Ions as Cofactors  
 Abstract    Rat fibroblasts, proliferation, calcium, potassium Embryonic rat cells are stopped in Gr phase when they are incubated in serum-free medium. They can be triggered to proceed through their cell cycle by the addition of two proteins which have been isolated from fetal calf serum. The influence of calcium and potassium ions on the stimulation process has been exam ined: 1. Ca2+ and K+ ions simultaneously must be present in the culture medium in concentrations of at least 5 x 10-4 m and 1 x 10-3 M, resp. 2. The intracellular concentrations of both ions are increased by the serum factors. 3. The intracellular concentrations of K+ strongly are dependent on the extracellular Ca2+-concen-trations; they increase threefold between 5 x 1 0 ~ 5 and 1 x 10-3 M of Ca2+. On the other hand, the intracellular calcium concentrations are not significantly influenced by the potassium content of the culture medium. 
  Reference    (Z. Naturforsch. 28c, 322 [1973]; eingegangen am 18. Dezember 1972) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0322 
 Volume    28 
66Author    Kuno KirschfeldRequires cookie*
 Title    Optomotorische Reaktionen der Biene auf bewegte "Polarisations-Muster" Optomotor Eesponses of the Bee to Moving " Polarisation-Pattem s"  
 Abstract    Optomotor responses, bee, polarisation-patterns Optomotor turning reactions were induced in worker bees by means of moving "polarisation-patterns". The responses appeared only when the stimulating light was confined to the short wave­ length part of the spectrum, and when the E-vector directions of the polarisation filters of whidi the pattern was composed were at ± 4 5 ° to the vertical for stimulation of the front region of the eye. Assuming that the polarisation sensitivity of the individual receptor is independent of the wavelength of the light, the experiments show that at least two of the known three different types of colour receptors contribute to the optomotor turning reaction. These results are in agreement with the assumption, that the retinula cell output of each ommatidium is superimposed before the correlation for movement detection between different ommatidial channels takes place. 
  Reference    (Z. Naturforsch. 28c, 329 [1973]; eingegangen am 30. März 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0329 
 Volume    28 
67Author    M. Anfred, H. Auser, G. Em Ot BeinbrechRequires cookie*
 Title    Deuteriumoxid-induzierte Filamentaggregation im Mikronukleus eines Ciliaten D20-Induced Filam ent Aggregation in the Mioronucleus of a Ciliate  
 Abstract    Heavy water, paracrystals, filaments, microtubules The large spindle-shaped micronucleus of Paramecium bursaria contains filaments of about 60 Ä diameter between numerous highly condensed chromosomes. Following treatment for several hours with 10% heavy water the nucleus becomes streched to several times its original length. The fila­ ments, whose number increases noticibly, then appear as an aggregate, which exhibits a somewhat paracrystalline arrangement. An examination of the filament aggregate by means of a laser dif­ fractometer yielded two diffraction lines corresponding to longitudinal periodicities of 91 — 99 and 160 —195 Ä. Since both periodicities are comparable to those reported for microtubular proteins, it is assumed the filaments reported here could be related to microtubular material. 
  Reference    (Z. Naturforsch. 28c, 339 [1973]; eingegangen am 1. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0339 
 Volume    28 
68Author    R.T C Huang, R. Rott, H.-D KlenkRequires cookie*
 Title    . Artificial Receptor for Influenza Virus  
 Abstract    Adsorption, influenca virus receptor, iV-acetyl neuraminic acid, hemagglutinin, neuraminidase Neuraminidase-treated erythrocytes coated with a variety of neuraminic acid-containing glyco­ proteins adsorbed influenza virus and neuraminidase-free hemagglutinins, but not purified neur­ aminidase. The results indicate that neuraminic acid is the binding site on the glycoprotein and that the rest of the molecule does not play a specific role in the reaction. 
  Reference    (Z. Naturforsch. 28c, 342 [1973]; received December 22 1972/March 3 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0342 
 Volume    28 
69Author    KlausJ. Wiegers, Rudolf DrzeniekRequires cookie*
 Title    Ribonuclease Present in Myxoviruses  
 Abstract    Ribonuclease, myxovirus, poliovirus, RNA, nucleases Endoribonuclease splitting single-stranded poliovirus RNA is associated with virions of the myxoviruses fowl plague virus and Newcastle disease virus. These virions are devoid of deoxyribo­ nuclease hydrolyzing single-stranded M 13 phage DNA and ribonuclease hydrolyzing double­ stranded poliovirus RNA. The latter enzyme, however, is present in allantoic fluids of infected chick embryos from whidi the virions are obtained. 
  Reference    (Z. Naturforsch. 28c, 346 [1973]; received February 23/April 25 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0346 
 Volume    28 
70Author    Requires cookie*
 Title    Preparation of Cobalamin Coenzyme-sepharose  
 Abstract    M a r g a r e t h e S c h l e c h t und O t t o M ü l l e r In s titu t für Organische Chemie, Biochemie und Isotopenforschung der U niversität S tu ttg a rt A ffinity chromatography, vitam in B12-binding proteins Kürzlich konnte Vitamin B12-monocarbonsäure säureamidartig mit 3.3'-Diamino-dipropylamin-substi-tuierter Sepharose verknüpft werden1. Diese Cobal-amin-Sepharose eignet sich zur Isolierung Vitamin B12 bindender Proteine. Wir haben gefunden, daß Vitamin B12-Sepharose durch direkte Umsetzung von Vitamin B12 mit brom-cyan-aktivierter Sepharose2 erhalten wird, wenn man die Reaktion bei pH 8 in Gegenwart von Cyanid durchführt, so daß der Kobalt-Komplex in der Di-cyano-Form vorliegt. Die Verknüpfung des Cobal-amins erfolgt offenbar über den Stickstoff der nucleo-tidischen Base, der bei Abwesenheit von Cyanid mit dem Zentralatom koordiniert. Für eine Reaktion an dieser Stelle spricht, daß ohne Cyanid keine Ver­ knüpfung mit bromcyan-aktivierter Sepharose zu­ stande kommt und daß das an N(3) des Dimethyl-benzimidazol-Anteiles methylierte Vitamin B12 3 nicht gekuppelt werden kann. Die Vitamin B12-Sepharose wird enzymchemisch in Cobalamin-Coenzym-Sepharose übergeführt. Hierzu eignet sich ein aus Extrakten von P. sbermanii gewon­ nenes Rohprotein, dem verschiedene Kofaktoren (siehe dazu4) zugesetzt wurden. Damit konnte auch gezeigt werden, daß bei Vitamin B12-Sepharose, die durch Umsetzung von bromcyan-aktivierter Sepharose m it Cyano-Cobalamin gewonnen wurde (s. o.), das Corrinoid für das aktive Zentrum des Enzyms er­ reichbar ist. Die Bildung von Cobalamin-Coenzym-Sepharose gelingt auch entsprechend dem Reaktionsprinzip zur Darstellung von Corrinoiden mit Kobalt-Kohlenstoff-Bindung5-8 durch Reduktion von Vitamin B12-Sepha-rose zum Co(I)-Komplex und dessen Umsetzung mit 5'-Tosyl-adenosin9. Weitere Untersuchungen dienen der Aufklärung der Bindungsweise zwischen Cobalamin und Sepharose, der Isolierung Cobamid-Coenzym synthetisierender Enzyme mittels Cyano-cobalamin-Sepharose sowie der 
  Reference    (Z. Naturforsch. 28c, 351 [1973]; eingegangen am 23. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0351_n 
 Volume    28 
71Author    Requires cookie*
 Title    Synthese von Glykosiden langkettiger Hydroxy-Fettsäuren Synthesis of Glycosides of Long Chain Hydroxylated F atty Acids  
 Abstract    A n d r a s L i p t a k , P e t e r K a z m a ie r und H i l d e b e r t W a g n e r Glycosides, fatty acids Von den bisher strukturell aufgeklärten Glykoli-piden aus Tomlopsis apicola1, Pseudomonas aerigi-nosa2, Ustilago zeae3 sowie Ipomoea muricata4 und den anderen Convolvulaceenharzen5-7, Diglykoside oder Oligoside langkettiger (C14-C18) Mono-oder Di-hydroxy-Fettsäuren, ist bisher noch keine Verbindung synthetisiert worden. ln der Literatur wurde bisher nur die Glykosidie­ rung einiger kurzkettiger Fettsäuren mit einer Ketten­ länge von maximal 5 C-Atomen beschrieben. So setz­ ten K a r r e r u . M itarb.7 die Silbersalze kurzkettiger a-Hydroxycarbonsäuren, W u l f f und M itarb.8-9 die Silbersalze und Methylester kurzkettiger H ydroxycar-bonsäuren in Anwesenheit von 1.3 bzw. 1.4-Dicarbon-säuresilbersalzen mit a-Acetobromglucose um. Sie er­ hielten neben den gewünschten 1-O-Acylderivaten auch die O-Glucosidacetate und 1-O-Tetra-O-acetyl-glucosyloxy-acyl-tetra-O-acetyl-glucosen. Das Gluco-sid der Oleanolsäure konnte unter diesen Bedingungen nicht dargestellt werden. Für unsere Modellsynthesen verwendeten wir die natürlich vorkommende 12-OH-Stearinsäure, die 
  Reference    (Z. Naturforsch. 28c, 352 [1973]; eingegangen am 28. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0352_n 
 Volume    28 
72Author    Requires cookie*
 Title    Neue Phlegm acin  
 Abstract    D erivate aus Cortinarius p ercom is (A garicales) Pigm ents of Fungi, X V I1 Novel Phlegmacin D erivatives from Cortinarius percomis (Agaricales) W. S t e g l i c h , E d d a T ö p f e r -P e t e r s e n u n d I r e n e P i l s Organisch-Chemisches In s titu t der Technischen Ph]egm acin-8'-m ethyl ethers A x and B lt anhydrophleg-m acin-9, 10-quinone-8'-m ethyl ether, pigm ents of fun­ gi, C o r tin a r iu s 
  Reference    (Z. Naturforsch. 28c, 354 [1973]; eingegangen am 12. März 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0354_n 
 Volume    28 
73Author    C., W. Brenner, W. EngelmannRequires cookie*
 Title    H eavy W ater Slows D ow n the Photoperiodic Tim ing o f Flow er Induction in  
 Abstract    h e n o p o d iu m r u b r u m Circadian rhythms, flower induction, photoperiodism, Chenopodium, deuterium oxide According to Bünning 1 photoperiodic timing is achieved by a circadian (i. e. about 24 hours) oscil­ lation. A num ber of different experimental approa­ ches have been used to test this hypothesis 2-6. Since D20 is known to slow down circadian rhythms ', we tried to use this feature in a further test of the hypothesis. U nder Bünning's hypothesis D20 should consequently also slow down the photoperiodic timing. Chenopodium rubrum ecotype 6 0 °4 7 ' is a suitable object because of its experimental advantages. Thus, it could be conveniently grown on moist filter paper in petri dishes 8. As known from the literature and shown in Fig. 1 (co n tro l), flower induction under varying lengths of dark periods occurs in a rhythmic 
  Reference    (Z. Naturforsch. 28c, 356 [1973]; received April 5. 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0356_n 
 Volume    28 
74Author    Hans-Dietrich Lüdemann, EberhardV. GoldammerRequires cookie*
 Title    The Association between Purine Nucleosides and Benzene in Aqueous Solution, Studied by Proton Magnetic Resonance and Nuclear Overhauser Enhancements  
 Abstract    Nucleosides, benzene, water, PMR, NOE The dependence of the PMR spectra of three purine nucleosides (inosine, adenosine and deoxy-adenosine) on temperature, concentration and addition of benzene (0.12 molal) has been investi­ gated in aqueous solution. The interaction of benzene with the nucleosides is deduced from the spectra. Enthalpies of self association have been determined as 2.2± 0.1 kcal-mole-1 for dA and I. The corresponding values obtained for hetero association with benzene are 2.7 + 0.2 kcal-mole" 1 for dA and 2.3± 0.2 kcal-mole-1 for I. The formation of edge to face complexes is concluded. Addi­ tional evidence for this type of hetero association has been obtained from the concentration and solvent dependence of the nuclear Overhauser enhancements (NOE) of solutions of the nucleosides. The enhancement factors of aqueous solutions of dA and I depend on the concentrations of the nucleosides. In solutions containing I the NOE found previously in DMSO and the NOE observed in D ,0 differ significantly x. The results obtained can be explained by a change of the average gly-cosyl torsion angle of approximately 10° to 15° in the two solvents. 
  Reference    (Z. Naturforsch. 28c, 361 [1973]; received April 2 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0361 
 Volume    28 
75Author    S. M. Arciani, M. Terbojevich, F. Daill 'acqua, G. RodighieroRequires cookie*
 Title    Bifunctional Photobinding of Psoralen to Single Stranded Nucleic Acids  
 Abstract    Psoralen, nucleic acids, cross-linkings As psoralen and other furocoumarin derivatives, intercalated between two base pairs of native DNA, under irradiation at 365 nm form inter-strand cross-linkings as a consequence of bifunctional addition, the writers have investigated the ability of psoralen to give such bifunctional photo­ additions, too, with nucleic acids with disordered or partilly disordered structure (denatured DNA and r-R \A). On the basis of fluorimetric, light-scattering, viscosimetric measurements and of the renaturation ability of denatured bacterial DNA, certain results have been obtained. In addition to mono­ functional photoadditions, psoralen can give bifunctional binding by irradiation at 365 nm both with denatured DNA and with r-RNA. However, when irradiation of denatured DNA in the presence of psoralen was performed in a concentrated solution (0.4%), the formation of bifunctional additions between two different strands was demonstrated by the increase (50%) of molecular weight of denatured DNA. However, when irradiation of denatured DNA was performed in more dilute solutions (0.1%), the bifunctional photoaddition of psoralen took place producing only bi­ functional additions in the same strand, very probably with the formation of loops, as has been shown by the absence of increase of molecular weight of DNA and by the more restricted structure assumed by the macromolecule, revealed by the light-scattering and viscosimetric measurements. The formation of these bifunctional additions was confirmed by the reduced rate of renaturation shown by denatured bacterial DNA after irradiation in the presence of psoralen. In the case of r-RNA, psoralen, when irradiated can form bifunctional additions only in the same strand. In tro d u c tio n 
  Reference    (Z. Naturforsch. 28c, 370 [1973]; received February 5/March 14 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0370 
 Volume    28 
76Author    E. Jürgen Zöllner, W. Erner, E. G. Müller, RudolfK. ZahnRequires cookie*
 Title    A Sensitive Method for Identification of DN A Dependent DNA Polymerases in Acrylamide Gels after Seperation by Micro Disc Electrophoresis  
 Abstract    DNA polymerase, disc electrophoresis, template affinity Two sensitive methods are described for detection of DNA dependent DNA polymerase activities in polyacrylamide gels after their fractionation by micro-disc electrophoresis. One technique is based on the increase in fluorescence of the ethidium bromide complex with template polydeoxyribonucleotides brought about by the action of the polymerases. The sensitivity of the previously described technique has been enhanced. Another method, 14 fold as sensitive, uses radioactive precursors in the enzyme assay after electrophoretic separation; washing, slicing and counting allows to evaluate incorporation into acid insoluble polymer, requiring 3* 10" 2 units corresponding to approx. 0.02 /ug of E. coli DNA polymerase I preparation. Differing activities of polymerase species and differing template preferences may be investigated with these techniques. 
  Reference    (Z. Naturforsch. 28c, 376 [1973]; received May 9 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0376 
 Volume    28 
77Author    I. Tomicic, M. Pieber, C. Romero, A. Soto, J. C. ToháRequires cookie*
 Title    Radioprotection (UV-and Gamma-rays) of DNA Molecule by Indole and Indole-derivatives  
 Abstract    DNA radioprotection, indole, radioprotective action The radioprotective ability of L-tryptophan, tryptamine, 3-indoleacetic and indole (10~4 m), on UV and gamma irradiated DNA (10-4 m) is studied. UV radioprotection is accomplished in the following order of efficiency: L-Tryptophan and 3-indoleacetic acid > indole and tryptamine. The corresponding DRF measured as absorbancy loss at 260 nm, were: L-Tryptophan and 3-indoleacetic acid around 3 and tryptamine and indole around l. When absorbancy loss plus changes in the patterns of the absorbancy curve were con­ sidered the DRF was: L-Tryptophan 2.53, 3-indoleacetic acid 1.54, indole 1.22 and tryptamine 0.75, respectively. For gamma radiation damage the order of radioprotection found was: Indole, L-tryptophan and tryptamine > 3-indoleacetic acid. The DRF when compairing the absorbancy loss at 260 nm, w ere: L-Tryptophan, Indole and tryptamine around 11 and 3-indoleacetic Acid around 4. When evaluating total changes in absorbancy the DRF were: Indole and L-tryptophan around 6.5, tryptamine 3.7 and 3-indoleacetic 2.1. These data were correlated with measurement of the degree of molecular interactions of DNA and protectors, studied by: Spectrophotometry, m.p. determinations, circular dichroism and oriented circular dichroism, viscosity, and rate of dialysis. Also data of fluorescence and phosphorescense were considered. For gamma radioprotection a mechanism based in radical trapping, local radical trapping and partial recovery of radioprotectors is proposed. UV radioprotection is discussed considering: The close interaction of L-tryptophan with DNA which might impede dimer formation, its proton and electron donor ability. A possible (triplet-triplet) energy transfer from excited DNA to indole derivative is discussed on the basis of acetone competition and a dimer excision process considered. 
  Reference    (Z. Naturforsch. 28c, 379 [1973]; received January 24/April 2 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0379 
 Volume    28 
78Author    I. Ibáñez, M. Pieber, J. ToháRequires cookie*
 Title    Interaction of L-Tryptophan with Inosine and Guanosine  
 Abstract    L-Tryptophan, guanosine, inosine The equilibrium constants for the complex between L-tryptophan and inosine are established by solubility measurements at different temperatures, the order of magnitude of these constants being about 103 times bigger than the corresponding one for the formation of guanosine-tryptophan or any other of the nucleoside-tryptophan complexes. The mode of association of these molecules is governed mainly by stacking interactions as it has been suggested from previous PMR results. The differences in magnitude obtained for the equilibrium constants of (I + T) with respect to (G + T) are discussed in terms of differences in solute-solvent and solvent-solvent interactions. Thermo­ dynamic parameters inferred from the equilibrium constants at different temperatures support this suggestion. Infrared results on I-T complex suggest that changes at the ribose moiety occurs and that possible hydrogen bridges are involved in the mechanism of association besides the stacking interactions. 
  Reference    (Z. Naturforsch. 28c, 385—389 [1973]; received January 9/March 23 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0385 
 Volume    28 
79Author    Günter Reske, Horst BauerRequires cookie*
 Title    Influence of Environment on the Photooxidation of Tryptophan with the Carcinogenic Hydrocarbon 3,4-Benzopyrene in Aqueous Solutions of Soap, Caffeine, and Urea  
 Abstract    3,4-Benzopyrene, tryptophan, photooxidation The solvent dependence of the photooxidation of tryptophan and 3,4-benzopyrene in aqueous solutions was studied by quantum yield measurements. When the hydrocarbon is dissolved in aqueous solution of caffeine, the quantum yields indicate a 3,4-benzopyrene photosensitized trypto­ phan oxidation instead of a photocooxidation, which is indicated in aqueous solution of sodium dodecylsulfate. The same photosensitized oxidation as in caffeine solution is observed, when urea (6 m) is added to the soap solution, while the fluorescence and absorption spectra indicate no change in the solvation state of the hydrocarbon, comparable to the change from hydrophobic solubilization by the detergent to dipole — induced dipole complex solubilization by caffeine. It is concluded that the difference in the reaction pathways is caused by different solvation states of the excited or reacting oxygen. In the discussion of the results it is referred to reactions of inhibitors. In tro d u ctio n 
  Reference    (Z. Naturforsch. 28c, 390 [1973]; received April 5 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0390 
 Volume    28 
80Author    S. S. BrodyRequires cookie*
 Title    Surface Properties of Plastocyanin at an Air-water Interface  
 Abstract    Plastocyanin, photosynthesis, monolayers, surface chemistry, chlorophyll The area/molecule, A, and surface potential, A V , of plastocyanin (pcyan) at an air-water inter­ face varies with pH. At a pH of about 8.6 a maximum value is obtained for A and AV. At a surface pressure of 3 dyn/cm A and A V are 375 Ä2 and 325 mV, respectively. The dipole moment is 2050 milliDebyes. Pcyan and chlorophyll a (chi) form a mixed film (free energy of mixing and interaction is negative). At a concentration of [pcyan] / [chi] « l a maximum interaction is observed both for AV and A (at pH 7.8). Irradiation of the mixed film, in a nitrogen atmosphere, results in an increase in A and A V. 
  Reference    (Z. Naturforsch. 28c, 397 [1973]; received January 9 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0397 
 Volume    28 
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