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1976 (164)
1Author    I. Keto-Enol, Tautomerism, O. Sciacovelli, A. Dell 'atti, A. De Giglio, L. CassideiRequires cookie*
 Title    Studies on Phenylpyruvic Acid  
 Abstract    Phenylpyruvic Acid, Tautomerism The tautomerism of phenylpyruvic acid (PPA) and its sodium salt was investigated. The *H and 13C spectra of PPA in aprotic solvents and in methanol show almost complete prevalence of the enol form, whereas the keto form prevails only in water. The Z configuration was assigned to the sole enol tautomer present on the basis of the value of the vicinal coupling constant | ^ H ^ 'COOH |=3.7 Hz. A small amount of the hydrated form of PPA (l-phenyl-2,2-dihydroxyl-propanoic acid) was found in the aqueous solution of its sodium salt and in buffer solution (pD -6) of PPA. By means of infrared spectroscopy one can conclude that crystalline PPA is in the enol whereas its sodium salt is in the keto form. The keto-acid was not obtained in the solid state. The colori­ metric method for testing PPA traces in urine depends on the formation of a enol-Fe3+ complex (2 :1) which appears stable in dimethylsulfoxide (DMSO). 
  Reference    (Z. Naturforsch. 31c, 5 [1976]; received July 1/October 6 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0005.pdf 
 Identifier    ZNC-1976-31c-0005 
 Volume    31 
2Author    Saradha Ramani, Seshadri KannanRequires cookie*
 Title    Inhibition of Ca2+ and Zn2+ Uptake by Mn2+ in Excised Rice Roots  
 Abstract    Ion Inhibition The effects of varying concentrations of Mn2* on the absorption of divalent cations, viz., Ca2+ and Zn2+ from 2 concentrations were studied. Mn2+ at all concentrations tested were inhibitory to Ca2+ uptake from 0.1 and 5 mM CaCl2 . However, when Ca2+ uptake was measured at concentrations ranging from 0.05 to 10 mM CaCl2, MnCl2 only at high concentration of 5 mM, inhibited Ca ab­ sorption. Zn2+ uptake from 0.1 mM ZnCl2 was decreased by all concentrations of Mn2+ . 
  Reference    (Z. Naturforsch. 31c, 12 [1976]; received August ll/September 19 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0012.pdf 
 Identifier    ZNC-1976-31c-0012 
 Volume    31 
3Author    Koshi Saito, Atsushi Komamine, Siro SenohRequires cookie*
 Title    Further Studies on the Biosynthesis of Stizolobinic Acid and Stizolobic Acid in the Etiolated Seedlings of Stizolobium hassjoo  
 Abstract    Incorporation of doubly labelled tyrosine into stizolobinic acid and stizolobic acid by the etio­ lated seedlings of Stizolobium hassjoo was studied. The retention of tritium activity in stizolobinic acid was 55%, while that in stizolobic acid was only 4.4% in average. The results strongly suggest that the heterocyclic rings of these two amino acids may be derived from 3,4-dihydroxyphenyl-alanine (DOPA) by extradiol cleavage of the aromatic ring. 
  Reference    (Z. Naturforsch. 31c, 15 [1976]; received September 1 1975) 
  Published    1976 
  Keywords    Stizolobium hassjoo, Biosynthesis, Stizolobinic Acid, Stizolobic Acid, 3, 4-Dihydroxyphenylalanine 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0015.pdf 
 Identifier    ZNC-1976-31c-0015 
 Volume    31 
4Author    Helmut Wombacher, Monika Reuter-SmerdkaRequires cookie*
 Title    Spectrometric and Biological Data of l,N 6-Ethenoadenosine 3',5'-Cyclic Monophosphate  
  Reference    (Z. Naturforsch. 31c, 18 [1976]; received July 12/September 25 1975) 
  Published    1976 
  Keywords    ) l, N 6-Ethenoadenosine 3', 5'-Cyclic Monophosphate, Fluorescence, Spectra, Protein Kinase 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0018.pdf 
 Identifier    ZNC-1976-31c-0018 
 Volume    31 
5Author    K.G R Pachler, P. L. Wessels, V. Christ, K. H. MaurerRequires cookie*
 Title      
 Abstract    The significance of pheromones in olfactory communication in mammals, and the possibility of using synthetic pheromones to influence the behaviour of problem animals, are briefly discussed. The isolation, identification and synthesis of the principal volatile component contained in the pedal gland exudate of the bontebok, Damaliscus dorcas dorcas, viz. (Z)-5-undecen-2-one, are re­ ported. Some of the other major constituents of the secretion have been identified as 2-heptanone, 2 -nonanone, 2 -undecanone and 2,5-undecanedione. 
  Reference    (Z. Naturforsch. 31c, 21—28 [1976]; received July 26 1975) 
  Published    1976 
  Keywords    Olfactory Communication, Pheromones, Mass Spectrometry, Ketones 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0021.pdf 
 Identifier    ZNC-1976-31c-0021 
 Volume    31 
6Author    I. Basic, KineticsHartmut Schmidt, Peter RosenkranzRequires cookie*
 Title    On the Mechanism of the Acridine Orange Sensitized Photodynamic Inactivation of Lysozyme  
 Abstract    The kinetics of the photodynamic desactivation of lysozyme in presence of acridine orange as the sensitizer have been investigated in detail varying oxygen, protein, dye concentration, ionic strength and pH value. The kinetics can be approximately described as an over all pseudo-first-order rate process. Changing the solvent from water to D20 or by quenching experiments in pres­ ence of azide ions it could be shown that the desactivation of lysozyme is caused exclusively by singlet oxygen. The excited oxygen occurs via the triplet state of the dye with a rate constant considerably lower than that to be expected for a diffusionally controlled reaction. Singlet oxygen reacts chemically (desactivation, k —2.9 x 107 M -1 sec-1) and physically (quenching process, k = 4.1 x 108 m — 1 sec-J) with the enzyme. The kinetical analysis shows that additional chemical reac­ tions between singlet oxygen and lysozyme would have only little influence on the kinetics of the desactivation as long as their products would be enzymatically active and their kinetical constants would be less than about 1 x 1 0 8 m -1 sec-1. 
  Reference    (Z. Naturforsch. 31c, 29 [1976]; received July 7/September 19 1975) 
  Published    1976 
  Keywords    Photodynamic Effect, Singlet Oxygen, Lysozyme, Acridine Orange, Kinetics 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0029.pdf 
 Identifier    ZNC-1976-31c-0029 
 Volume    31 
7Author    GünterG. NollRequires cookie*
 Title    A Cell for Simultaneous Measurements of Optical and Electrical Properties of Black Lipid Membranes  
 Abstract    A universal cell was constructed, which allows measurements of the resistance (d. c.), capacity, optical reflectivity, and spectral absorption of blade lipid films simultaneously. These measurements reflect different properties of the films, supplementary to each other. The purpose is to eliminate differences of experimental conditions especially in recombination experiments with proteins. The cell is totally symmetric, can be completely disassembled, and the parts are exchangeable. It allows application of several methods for film production, and is held together simply by mechanical pressure, without need of any sealing agent. The inner parts are exclusively of glass and teflon. The fluid volume of the cell is 7 —15 ml and the better than 1014 Ohms. 
  Reference    (Z. Naturforsch. 31c, 40—43 [1976]; received September 22 1975) 
  Published    1976 
  Keywords    Black Lipid Membranes, Simultaneous Measurements, Optical Properties, Electrical Properties, Recombination Experiments 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0040.pdf 
 Identifier    ZNC-1976-31c-0040 
 Volume    31 
8Author    P. Chin, S. S. BrodyRequires cookie*
 Title    Mixed Monomolecular Films of Chlorophyll and Cytochromes  
 Abstract    Cytochrome, Chlorophyll, Monolayers Photosynthesis Mixed monomolecular films of cytochrome (Cyt) and chlorophyll (Chi) were spread at a nitrogen-water interface. A large interaction is observed between reduced Cyt f and Chi a in a mixed film. Oxidized Cyt f and Chi a in a mixed film show little evidence for interaction. Mixed monomolecular films of Chi a with either reduced or oxidized Cyt c appears to result in denatura-tion of the protein at the surface. A light reaction is observed only in mixed films of reduced Cyt f and Chi a. 
  Reference    (Z. Naturforsch. 31c, 44 [1976]; received February 3/October 3 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0044.pdf 
 Identifier    ZNC-1976-31c-0044 
 Volume    31 
9Author    Wolfgang Lockau, BruceR. SelmanRequires cookie*
 Title    Correlation of the Photosynthetic Reduction of /J-(Diazonium-)Benzenesulfonic Acid with the Increased Binding of the Probe to the Thylakoid Membrane  
 Abstract    Chloroplast Membrane, Chemical Probe, p-(Diazonium-) Benzenesulfonic Acid, Photosynthetic Reduction The reactions of chloroplast thylakoid lamellae with the chemical probe p-(diazonium-) benzene­ sulfonic acid (DABS) in the light have been reinvestigated. In contrast to a previous report, elec­ tron transport from a photosystem I electron donor to methylviologen was found to be inhibited by this treatment. During the incubation of chloroplasts with DABS in the light, the probe is altered with high rates. Under aerobic conditions, a concomitant oxygen uptake is observed, which is stoichiometric to the amount of DABS altered. Under anaerobic conditions, the binding of the 35S-labeled probe to the membranes in the light is stimulated 2 — 3 fold as compared to the binding under aerobic conditions. The data are taken as evidence that the photoreduction of the probe rather than a conformational change of the membrane may be at least partially responsible for the increased reagent binding observed in the light. 
  Reference    (Z. Naturforsch. 31c, 48 [1976]; received September 22 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0048.pdf 
 Identifier    ZNC-1976-31c-0048 
 Volume    31 
10Author    H. An, Sjö Rg, A. W. SchneiderRequires cookie*
 Title    Enzymic Capacities for Chlorophyll Biosynthesis. Activation and de novo Synthesis of Enzymes  
 Abstract    A previously published working model for the regulation of chlorophyll formation has been tested studying early steps of chlorophyll and porphyrin biosynthesis in developing cotyledons of H elianthus annuus. The activities of <5-aminolevulinate synthetase (ALAS), <5-aminolevulinate dehydratase (ALAD), and the porphobilinogenase complex (PBGase) at any given time have been found to be strongly associated with endogenous developmental processes. Highest activities in dark­ ness have been observed at times when maximum chlorophyll formation would have occurred had the plants been exposed to light. Only in the case of ALAS was the maximum activity in light much greater than that observed in the dark. Density labeling experiments and other data suggest that enzyme synthesis is mediated both by development and by illumination. Moreover, ALAS activity appears to be subject to inhibition, presumably by products of the porphyrin biosynthesis, as indicated by halflife experiments. Rapid enzyme degradation in the absence of light seems to be less probable. Slight ALAS activity in darkness is present as long as the plastids are not fully developed. In contrast to findings with cell cultures of tobacco, in Helianthus cotyledons ALAS certainly plays the main role in the regulation of chlorophyll biosynthesis. Nevertheless, increasing activities of the succeeding enzymes, located in the plastids, ensure that increased concentrations of 6-aminolevulinate (ALA) are drawn into the chlorophyll biosynthetic pathway. The experiments corroborate the suggestion that chlorophyll biosynthesis is controlled by different but interdependent mechanisms. The dominant regulatory mechanism is dependent on the stage of development. 
  Reference    (Z. Naturforsch. 31c, 55 [1976]; received September 1 1975) 
  Published    1976 
  Keywords    <5-Aminolaevulinic Acid Synthese, ö-Aminolaevulinic Acid Dehydratase, Porphobilinogenase, Protochlorophyllide, Cotyledons of Helianthus 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0055.pdf 
 Identifier    ZNC-1976-31c-0055 
 Volume    31 
11Author    G. Ünter, D. Ö. RinRequires cookie*
 Title    The Effect of Deoxycholate-Treatment to the Photoreactions of the Active Pigments in Photosynthesis  
 Abstract    In the heavy fraction of deoxycholate-treated spinach chloroplasts the chlorophyll an activity is high and the chlorophyll a\ activity is low when no artificial electron donor is added. The addition of the photosystem I donor system N-methyl-phenazonium sulphate plus sodium ascorbate (PMS + Asc) leads to a complete reactivation of the chlorophyll ai reaction. The addition of the photo­ system II donor system p-benzohydroquinone plus sodium ascorbate (HQ + Asc) leads to an inhibi­ tion of the chlorophyll an activity. From these results we conclude: 1. Besides an interruption of the linear electron flow between the two photosystems deoxycholate-treatment leads to a block of the electron flow from water to photosystem II. 2. In deoxycholate-treated chloroplasts the linear electron flow in photosystem II just like in Tris­ washed, heat-treated or aged chloroplasts, is replaced by a cyclic one. 
  Reference    (Z. Naturforsch. 31c, 64 [1976]; received August 19 1975) 
  Published    1976 
  Keywords    Photosynthesis, Deoxycholate-Treatment, Electron Transport, Flash Excitation 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0064.pdf 
 Identifier    ZNC-1976-31c-0064 
 Volume    31 
12Author    H. BöhmRequires cookie*
 Title    Photoreactions of Cytochrome b6 and Cytochrome f in Chloroplast Photosystem I Fragments  
 Abstract    Photosynthesis, Photosystem I, Cyclic Electron Transport, Redox Reactions of Cytochromes Photosystem I fragments were prepared by digitonin treatment of spinach chloroplasts. The mid­ point potential of cytochrome b6 in the fragments is close to 0 V, showing a one electron transition. No cytochrome b559 was detectable, neither in difference absorption spectra nor in light-induced absorbance changes. In the absence of added cofactors only cytochrome b6 photoreduction can be observed. This photoreduction is stimulated by ferredoxin. Ferredoxin-NADP+ reductase appears not to be involved in cytochrome b6 reduction. Photooxidation of cytochrome b6 is dependent on plastocyanin addition and inhibited by DBMIB, a plastoquinone antagonist. Addition of plasto-cyanin restores cytochrome f photooxidation as well, reacting quite specifically in about equimolar concentrations to bound cytochrome f. The stimulation of cytochrome f oxidation is abolished by an antibody prepared against plastocyanin, indicating a surface location of plastocyanin in digitonin treated membranes. Biphasic kinetics of dark-reduction of cytochrome f by ascorbate indicate that part of this cyto­ chrome f is relatively inaccessible in the membrane. After preillumination a monophasic reduction is observed and the slowly oxidized component is absent. Illumination in the presence of plasto­ cyanin causes a fast and complete reduction of cytochrome f, suggesting equilibration of cyto­ chrome f with added plastocyanin, residing in the membrane surface. It appears that actinic light causes conformation and/or structural changes in the membrane of these digitonin fragments, influencing cytochrome f accessibility. 
  Reference    (Z. Naturforsch. 31c, 68 [1976]; received September 5/October 1 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0068.pdf 
 Identifier    ZNC-1976-31c-0068 
 Volume    31 
13Author    G. Ünter, D. Ö. RinRequires cookie*
 Title    The Chlorophyll an Reaction in Trypsin-Treated Spinach Chloroplasts in the Presence of Potassium Ferricyanide  
 Abstract    In trypsin-treated spinach chloroplasts there is no linear electron flow from water to potassium ferricyanide. The chlorophyll a n reaction, however, is still active but insensitive to 3-(3,4-dichloro-phenyl)-l,l-dimethylurea. From this we conclude that ferricyanide and trypsin together stimulate a mini-cycle in photosystem II. 
  Reference    (Z. Naturforsch. 31c, 78 [1976]; received July 29/October 15 1975) 
  Published    1976 
  Keywords    Photosynthesis, Photosystem II, Trypsin-Treatment, Flash Excitation 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0078.pdf 
 Identifier    ZNC-1976-31c-0078 
 Volume    31 
14Author    G. K. Ulandaivelu An, D.0 H AllRequires cookie*
 Title    Ultrastructural Changes in in vitro Ageing Spinach Chloroplasts  
 Abstract    Ultrastructural changes in in vitro ageing spinach chloroplasts have been studied in detail. Prolonged storage caused swelling of the chloroplasts due to the increase in the thickness and spacing of the thylakoid membranes. The increase in the thickness of the membrane is partly ac­ companied by the release of lipids. Addition of crystalline bovine serum albumin was found to stabilize the membrane structures. Storage of the chloroplasts at 77 °K even though it resulted in complete breakage of the whole chloroplasts, maintained the thylakoid structures in a highly intact form. 
  Reference    (Z. Naturforsch. 31c, 82 [1976]; received August 8 1975) 
  Published    1976 
  Keywords    Ultrastructure, Thylakoid Membrane, Ageing, Storage Conditions, Spinach 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0082.pdf 
 Identifier    ZNC-1976-31c-0082 
 Volume    31 
15Author    Requires cookie*
 Title    Größenvergleich der Poly(A)-RNA aus Polysomen und aus Kernen bei der Hefe Saccharomyces cerevisiae  
 Abstract    Size C om parison of P oly (A)-RNA fro m Polysom es an d fro m N uclei of th e Yeast S acch arom yces cerevisia e K ornelia A ngerm ann, U lrich G rundm ann u n d H a rtm u t Holz Yeast, Polysomes, Nuclei, Poly (A)-RNA The size of poly(A)-RNA from polysomes and cell nuclei of the yeast Saccharomyces cerevisiae was investigated. Pulslabelled cells ([14C]adenin) were cracked by the French press; polysomes and nuclei were separately isolated and the RNA was finally extracted with phenol. The separation of poly (A)-containing and poly (A)-lacking fractions was achieved by oligo (dT) cellulose. These fractions were characterized by sedimentation analysis. The main portion of polysomal poly (A) -RNA sedimented with a rate of 8 to 14S, whereas the poly (A)-RNA of nuclei exhibited a sedimen­ tation rate of 12 to 17S. Thus nuclear poly (A)-RNA is about 20 —30% larger than polysomal poly (A) -RNA. 
  Reference    (Z. Naturforsch. 31c, 85 [1976]; eingegangen am 19. September/17. Oktober 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0085.pdf 
 Identifier    ZNC-1976-31c-0085 
 Volume    31 
16Author    Requires cookie*
 Title    Chromosomale Strukturen von Pseudomonas testosteroni  
 Abstract    I. Isolierung u n d C harak terisieru n g d er chrom osom alen K om plexe Chrom osom al S tructures of P seu d o m o n a s te sto stero n i I. Isolation and C haracterization of the C hrom osom al Com plexes G ünter R eim er u n d D usan D rahovsky Bacterial Chromosome, Different Forms, Deoxyribonuclease Digestion After lysis of Pseudomonas testosteroni with lysozyme and non-ionic detergents different DNA-protein complexes can be separated in 5 —25% (w/v) neutral sucrose gradient. The protein to DNA ratio of these complexes varies between 0.5—4.5 to 1, whereby the faster sedimenting forms contain more protein than the slower sedimenting ones. Different initial rates of DNase digestion may indicate various degrees of DNA packing in these complexes. The chromosomal complexes of Pseudomonas testosteroni are relatively stable towards pronase. Treatment with RNase or sodium dodecylsulphate is accompanied by a dramatic increase in viscosity and decrease in relative density. It suggests that DNA in these complexes is maintained in its supercoiled form by RNA molecule (s) in a similar way as in isolated chromosome of E. coli. S tonington u n d P e ttijo h n 1 sow ie W orcel und 
  Reference    (Z. Naturforsch. 31c, 91—97 [1976]; eingegangen tun 29. August/8. Oktober 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0091.pdf 
 Identifier    ZNC-1976-31c-0091 
 Volume    31 
17Author    N. Ikos, K. OkolisRequires cookie*
 Title    Variations in Melanin and Riboflavin Content of Amphibian Liver under the Influence of Reserpine and Amphetamine  
 Abstract    Melanin, Riboflavin, Liver, Reserpine, Amphetamine Effects By means of paper chromatography, Lactobacillus casei test and the staining method with the Feulgen reaction, the effects of reserpine and amphetamine on riboflavin and melanin were studied in the liver of Triturus cristatus. It was demonstrated that the concentrations of both melanin and riboflavin can be altered by the influence of these drugs. From the results obtained it is suggested that riboflavin shows a correlation with the density of melanin. 
  Reference    (Z. Naturforsch. 31c, 98 [1976]; received August 4/September 29 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0098.pdf 
 Identifier    ZNC-1976-31c-0098 
 Volume    31 
18Author    R. H. Arcus, P.N P Reston, J. S. SuffolkRequires cookie*
 Title    Synthesis o f Purine and Pyrim idine Substituted N itroxides  
 Abstract    Purines, Pyrimidines, Nitroxides Reaction of 6-hydrazinopurine and 2-hydrazinopyrimidine with 2,2,6,6-tetramethylpiperidone-l-oxyl gives 
  Reference    (Z. Naturforsch. 31c, 101 [1976]; received July 8/September 24 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0101_n.pdf 
 Identifier    ZNC-1976-31c-0101_n 
 Volume    31 
19Author    S. Reim, A. T. RebstRequires cookie*
 Title    Reversal of Dibrom othym oquinone Inhibition o f P hotosynthetic Electron Flow by Thiol Compounds  
 Abstract    Dibromothymoquinone, Photosynthesis, Inhibition, Thiol Compounds Dibromothymoquinone inhibits photosynthetic NADP re­ duction by broken chloroplasts. The inhibition of electron flow and coupled ATP formation is effectively reversed by the addition of thiol compounds. 
  Reference    (Z. Naturforsch. 31c, 103 [1976]; received October 10 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0103_n.pdf 
 Identifier    ZNC-1976-31c-0103_n 
 Volume    31 
20Author    H. Artm, K. Ern, JoachimG. RüblerRequires cookie*
 Title    Redundante N ucleotid-Sequenzen in D N A aus W eizen R edundant N ucleotide-Sequences in DNA from W heat  
 Abstract    Wheat, Germination, DNA, Redundancy DNA from dormant and germinated embryos exhibit dif­ ferences in the kinetics of reassociation of thermal denatured nucleic acid. Within 24 h of germination a reduction of the renaturation, expressed as Coti/j of the redundant fraction, is detectable. 
  Reference    (Z. Naturforsch. 31c, 104 [1976]; eingegangen am 29. September 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0104_n.pdf 
 Identifier    ZNC-1976-31c-0104_n 
 Volume    31 
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