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1979 (244)
101Author    Wolfgang Lohmann, Rainer LangeRequires cookie*
 Title    On the Possible Involvement of Ascorbic Acid and Copper Proteins in Leukemia. III. ESR Investigations on the Interaction between Ascorbic Acid and Some Transition Metal Ions  
 Abstract    The interaction between lyophilized samples of ascorbic acid and Cu2+, Fe3+ or M n2+ has been investigated by means of ESR spectroscopy. All of the three transition metal ions form complexes with vitamin C, but only in the case of C u2+ and Fe3+ the interaction results in a reduction of the metal ions. C u2+ and ascorbic acid seem to form 2 : 1 complexes with an equilibrium constant of about K = 1 x 107 mol-1. None of these metal ion complexes exhibits, however, the ESR spectrum obtained with leukemic blood. 
  Reference    Z. Naturforsch. 34c, 546—549 (1979); received March 21/May 4 1979 
  Published    1979 
  Keywords    Leukemia, ESR, Ascorbic Acid, Transition Metal Ions 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0546.pdf 
 Identifier    ZNC-1979-34c-0546 
 Volume    34 
102Author    Wolfgang Lohmann, Jörg Schreiber, Walter Greulich, LeukemiaRequires cookie*
 Title    On the Possible Involvement of Ascorbic Acid and Copper Proteins in  
 Abstract    The interaction between lyophilized samples of ascorbic acid and some copper proteins (ceru-loplasmin, cytochrome-c-oxidase, ascorbate-oxidase) has been investigated by means of ESR spec­ troscopy. The spectra obtained are identical to the one obtained with leukemic blood. The conse­ quences of this for the molecular events occuring in cancer are discussed. The model proposed can explain the experimental findings reported thus far (such as change in spin concentration with the development of cancer, the presence of a high concentration of antioxidants etc.) as well as recon-sile the two existing and seemingly contradictory hypothesis. Possible implications for lipid per­ oxidation and for the respiratory process are discussed. 
  Reference    Z. Naturforsch. 34c, 550—554 (1979); received March 21/May 4 1979 
  Published    1979 
  Keywords    Leukemia, ESR, Ascorbic Acid, Copper Proteins, Lipid Peroxidation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0550.pdf 
 Identifier    ZNC-1979-34c-0550 
 Volume    34 
103Author    P. Dancker, I. LowRequires cookie*
 Title    Complex Influence of Cytochalasin B on Actin Polymerization  
 Abstract    In the presence of very low concentrations (about 2 x 10~7 m) of cytochalasin B (CB) the time course of actin polymerization is much more sigmoidal when followed by viscosity measurements than when followed by light scattering measurements. This suggests that under these conditions actin polymers do not immediately reach their final length but only via short "bent" polymers which can be detected only by light scattering but not by viscosity measurements. At higher CB concentrations (about equimolar to those of actin) CB reduces the average degree of polymeriza­ tion and favors the nucleation step necessary for polymerization. 
  Reference    Z. Naturforsch. 34c, 555—557 (1979); received March 13 1979 
  Published    1979 
  Keywords    Actin, Cytochalasin B, Cell Motility, Muscle Proteins, Micro filaments 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0555.pdf 
 Identifier    ZNC-1979-34c-0555 
 Volume    34 
104Author    ThomasL J Boehm, Dusan DrahovskyRequires cookie*
 Title    Verteilung und enzymatische Hypermethylierung invers repetitiver DNA-Sequenzen in verschiedenen Mäuse-und menschlichen Zellen Distribution and Enzymic Hypermethylation of Inverted DNA Repeats in Different Murine and Human Cells  
 Abstract    Reassociation Kinetics, Enzymatic DN A Methylation A specific class of DN A sequences, the inverted repetitive sequences, forms a double-stranded structure within a single linear polynucleotide chain in denatured DNA. The reassociation process is unimolecular and occurs very fast. Quantitative analyses have shown that these sequences com-E rise about 4-5% of the nuclear D N A of various mammalian cells (P815 mouse mastocytoma, [ela, L cells, Raji and Chang cells, and human embryonic hepatocytes) and are interspersed within sequences of other degrees of repetitiveness. After labeling the cells with L-[Metnyl-3H]methionine and [14C]deoxycytidine, relative rates of enzymic D N A methylation were computed on the basis of 3H and 14C radioactivities found in py­ rimidine residues of the nuclear DNA. The results indicate that D N A of inverted repetitive se­ quences is methylated to a level about 50% higher than the ordinary repetitive sequences and to about 300% higher than the unique and intermediary sequences. The biological function of the inverted repeats as well as the role of their enzymic hypermethyl­ ation is unknown. 
  Reference    Z. Naturforsch. 34c, 558—564 (1979); eingegangen am 2. Februar/6. April 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0558.pdf 
 Identifier    ZNC-1979-34c-0558 
 Volume    34 
105Author    Roland Süssmuth, Annette WidmannRequires cookie*
 Title    y-Bestrahlte Ribosomen von Micrococcus radiodurans in einem System der zellfreien Proteinsynthese y-Irradiated Ribosomes from Micrococcus radiodurans in a Cell-Free Protein Synthesizing System  
 Abstract    y-irradiation inactivation of isolated ribosomes of Micrococcus radiodurans was studied by ex­ amining poly U directed synthesis of polyphenylalanine. Ribosomes of M . radiodurans did not show significant y-radiation sensitivity up to a dose of approx. 11.6k Gy. Cells of M . radiodurans take up more magnesium than E. coli cells unter the same conditions. The magnesium content of ribosomes of M . radiodurans was 18% higher than that of E. coli ribosomes. A possible relation between Mg2+-content and y-resistance is discussed. 
  Reference    Z. Naturforsch. 34c, 565—569 (1979); eingegangen am 22. März/30. April 1979 
  Published    1979 
  Keywords    Micrococcus radiodurans, Cell-Free Polyphenylalanine Synthesis, y-Radiation Resistance, Magne­ sium Content 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0565.pdf 
 Identifier    ZNC-1979-34c-0565 
 Volume    34 
106Author    GeorgH. Schmid, Pierre ThibaultRequires cookie*
 Title    Characterization of a Light-Induced Oxygen-Uptake in Tobacco Protoplasts  
 Abstract    Protoplasts prepared from the wild type tobacco N. tabacum var. John W illiam 's Broadleaf ex­ hibit photosynthetic oxygen-evolution if the suspension medium is supplemented with bicarbonate. In the absence of bicarbonate no steady state oxygen-evolution is observed with such prepara­ tions. Instead, an appreciable uptake which is mainly insensitive to D C M U and which persists over hours, and therefore is no mduction phenomenon, is seen. Protoplasts of the tobacco aurea mutant Su/su, which is a plant with an exceptionally high photorespiration, show an oxygen con­ 
  Reference    Z. Naturforsch. 34c, 570—575 (1979); received April 2 1979 
  Published    1979 
  Keywords    Protoplasts, Oxygen-Uptake, Photorespiration, Action Spectrum 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0570.pdf 
 Identifier    ZNC-1979-34c-0570 
 Volume    34 
107Author    H. Berndt, D. Wölfle, H. Bahl, A. SteinbiichlRequires cookie*
 Title    Evidence for Carbon Monoxide Insensitive Respiration in the Aerobic Nitrogen Fixing Bacteria Azotobacter vinelandii OP and Xanthobacter autotrophicus GZ 29  
 Abstract    In intact cells of the non-gummy Azotobacter vinelandii OP CO-insensitivity of the respiratory activity increased with decreasing dissolved oxygen tension in the bacterial suspension. Upon changing from low to high aeration conditions the CO-sensitive respiration was restored. Mea­ surement of the oxidative activity of small particles of A. vinelandii OP with N A D H , ascorbate-DCPIP and ascorbate-TMPD as substrate in the presence and absence of CO indicated that the CO-insensitive site is probably identical with cytochrome , which preferably is reduced by elec­ trons from ascorbate-DCPIP. Small particles of the gum producing A. vinelandii NCIB 8660 ap­ peared to be more sensitive towards CO with ascorbate DCPIP than the non-gummy A. vinelandii OP. In small particles the CO-insensitive DCPIP oxidase was present irrespective of the dissolved oxygen tension during cell growth. In intact cells, however, CO-insensitivity was only expressed at low dissolved oxygen tension when electrons are directed to cytochrome a ^ o in the branched re­ spiratory chain. Intact cells of Xanthobacter autotrophicus G Z 29 exhibited a similar CO-insensi-tive respiration as A. vinelandii OP. 
  Reference    Z. Naturforsch. 34c, 576—581 (1979); received February 26/April 5 1979 
  Published    1979 
  Keywords    Azotobacter vinelandii, Xanthobacter autotrophicus, Carbon Monoxide, Respiratory Chain 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0576.pdf 
 Identifier    ZNC-1979-34c-0576 
 Volume    34 
108Author    Framboise Techy, Monique Dinant, Jacques AghionRequires cookie*
 Title    Interactions between Photosynthetic Pigments Bound to Lipid and Protein Particles. Spectroscopic Properties  
 Abstract    The spectroscopic (visible) properties of pigment-bearing lipid and protein particles extract­ ed from milk show that: 1) chlorophylls a and b bound to separate particles can form aggregates provided their relative concentration is high enough. Neither pheophytin a nor ^-carotene, in the same conditions, form observable aggregates. 2) Chlorophylls a and b can co-aggregate when they are bound to the same particles. Pheophytin a as well as /8-carotene seem to prevent the aggregation of chlorophyll a. p-carotene has no effect on the aggregation of chlorophyll b. 
  Reference    Z. Naturforsch. 34c, 582—587 (1979); received December 15 1978/April 9 1979 
  Published    1979 
  Keywords    Spectroscopy, Photosynthetic Pigments, Artificial Membranes 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0582.pdf 
 Identifier    ZNC-1979-34c-0582 
 Volume    34 
109Author    MartinG. Peter, Sonny Gunawan, Gerd Gellissen, Hans EmmerichRequires cookie*
 Title    Differences in Hydrolysis and Binding of Homologous Juvenile Hormones in Locusta migratoria Hemolymph  
 Abstract    Enantioselectivity of JH Carriers, Enantioselectivity of JH Esterases, Locusta, Juvenile Hormone, I and III, Protective Function of Carriers Male Locusta hemolymph contains JH-esterase(s) and a JH-carrier protein with high affinity and low capacity that both interact enantioselectively with juvenile hormones. Exposure of race-mic JH-I and JH-III results in preferential hydrolysis of the naturally configurated enantiomer of JH-I but the unnaturally configurated enantiomer of JH-III. The JH-carrier protein has a remark­ able specificity for the natural enantiomer of JH-III but discriminates only weakly between enan-tiomers of JH-I. This observation indicates a protective function of the JH-specific carrier protein for JH-III but not for JH-I. A third major protein, the diglyceride carrier lipoprotein (DGCL), shows no stereoselectivity at all. 
  Reference    Z. Naturforsch. 34c, 588—598 (1979); received March 12 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0588.pdf 
 Identifier    ZNC-1979-34c-0588 
 Volume    34 
110Author    Karel SlámaRequires cookie*
 Title    Hypermetabolic Response Induced by Juvenile Hormone Analogues in an Insect  
 Abstract    Institute o f E ntom ology, Czechoslovak Academ y o f Sciences, Flem ingovo 2, 16609 Praha 6, Cze­ choslovakia and Ilona Kryspin-Sørensen Juvenile H orm one, Juvenoids, Respiratory M etabolism, Hypermetabolic Response Some synthetic analogues o f insect juvenile hormone cause trem endous rise o f respiratory m e­ tabolism in the last larval instar o f Dermestes maculatus. The 0 2 consum ption values occasionally found in these hyperm etabolic larvae (20 m l/g /h) can be classified am ong the m ost intensive res­ piratory rates ever recorded in living organisms. The phenom enon is directly related to the dose o f juvenile horm one activity and it is dependent on nutrition. The m echanism o f such specific m eta­ bolic action o f juvenile hormone is based on complete oxidation o f the dietary fatty acids, provid­ ing m etabolic water for larval somatic growth. The excessive amounts o f energy created by hy­ perm etabolism are partly converted to heat, suggesting uncoupling o f phosphorylation. Some other specific endocrinological features associated with hypermetabolism have been discussed. 
  Reference    Z. Naturforsch. 34c, 599—607 (1979); received March 25 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0599.pdf 
 Identifier    ZNC-1979-34c-0599 
 Volume    34 
111Author    L. F. Buchholz, D. AdelungRequires cookie*
 Title    Untersuchungen zur Wirkung von injiziertem ß-Ecdyson auf die Strandkrabbe Carcinus maenasL. Investigations on the Effects of Injected Ecdysone upon the Green Shore Crab Carcinus  
 Abstract    Ecdysone, Y-Organ, M olt Inhibiting Hormone In order to accelerate and artificially induce molting, unoperated crabs, crabs without eye-stalks, Y-organ ectom ized and Y-organ-and eyestalkless animals were injected with m ultiple dos­ es o f /8-ecdysone. M olting itself was not induced in any case, whereas in double operated animals, both destalked and Y-organless, an acceleration o f longer duration o f m olt preparatory processes was achieved. In all other crabs premolt processes were observed to a much lesser extent, and were only short termed. These findings lead to the conclusion that the Molt Inhibiting H orm one, which is produced in the eyestalks, might not inhibit the action o f the Y-organ alone, but acts also onto the peripheral tissues. Furtheron it is concluded that phases o f increased susceptibility to the injected horm one m ight not exist. 
  Reference    Z. Naturforsch. 34c, 608—611 (1979); received September 26 1978/April 27 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0608.pdf 
 Identifier    ZNC-1979-34c-0608 
 Volume    34 
112Author    Uwe Homberg, Joachim ErberRequires cookie*
 Title    Response Characteristics and Identification of Extrinsic Mushroom Body Neurons of the Bee  
 Abstract    The activity o f single neurons with constant discharge frequencies in the area around the a-lobe o f the mushroom bodies o f the bee was recorded intracellularly. The spontaneous discharge fre­ quency o f these neurons ranged between 5 and 95 im pulses per second. W hen stimulated, about 80 percent o f the neurons responded to at least one o f five different sensory modalities: scent; light; air current to the antennae; sugar water applied to the antennae and to the proboscis. 45 percent o f the neurons responded to two or more m odalities, these multimodal neurons are com ­ mon in the median protocerebrum o f the bee. The differentiated response pattern o f the cells does not allow a simple classification. Som e o f the neurons were identified after the injection o f the flu­ orescent dye Procion yellow. W e found 4 neurons with arborizations in the a-lobe and the calyces o f the mushroom bodies. 
  Reference    Z. Naturforsch. 34c, 612 (1979); received April 12 1979 
  Published    1979 
  Keywords    Bee, Brain, M ushroom Bodies, Electrophysiology, Identified Neurons 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0612.pdf 
 Identifier    ZNC-1979-34c-0612 
 Volume    34 
113Author    J. BernhardtRequires cookie*
 Title    Biologische Wirkungen elektromagnetischer Felder Biological Effects of Electromagnetic Fields  
 Abstract    This resume deals with thermal and nonthermal effects o f electromagnetic fields on man. In consideration o f two aspects a limitation is necessary. Firstly, there will be discussed only direct and im m ediate influences on biological cells and tissues, secondly, the treatment is limited to such phenom ena, for which biophysical aproxim ations, based on experimental data, could be develop­ ed. Hazards for the human being may occur only by thermal effects within the microwave range. Regarding frequencies below approxim ately 30 kHz, excitation processes cannot be excluded in exceptional cases. Thermal effects are predom inant, between 30 kH z and 100 kHz, before excita­ tions can appear. Furthermore, by com paring the electrically and m agnetically induced currents with the natural­ ly flowing currents in man caused by the brain's and heart's electrical activity, a "lower boundary-line" was estimated. Regarding electric or magnetic field strengths undercutting this boundary-line, direct effects on the central nervous system may be excluded; other m echanism s should be re­ sponsible for demonstrated biological effects. The paper closes referring to som e reports — presently discussed — on experimental findings o f biological effects, which were observed as a result o f the influence o f electromagnetic fields o f small field strengths. 
  Reference    Z. Naturforsch. 34c, 616 (1979); eingegangen am 18. April 1979 
  Published    1979 
  Keywords    Electromagnetic Fields, Thermal Effects, Nontherm al Effects, Central Nervous System, Current Densities 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0616.pdf 
 Identifier    ZNC-1979-34c-0616 
 Volume    34 
114Author    Nariyuki Ishikura, Keishin Sugahara, Kazu KurosawaRequires cookie*
 Title    Eriodictyol-7-glucoside and Other Phenolics in the Blue Fruits of Lasiauthus japonica  
 Abstract    Lasianthus japonica, Eriodictyol-7-glucoside, Eriodictyol, Scopoletin Eriodictyol-7-glucoside, a flavanone glycoside, was isolat­ ed as cream-white needles from the deep-blue fruit skins o f Lasianthus japonica, and in the same tissue eriodictyol and scopoletin were also found to occur in a small amount by m eans o f paper chromatography. 
  Reference    Z. Naturforsch. 34c, 628 (1979); received April 301979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0628_n.pdf 
 Identifier    ZNC-1979-34c-0628_n 
 Volume    34 
115Author    JohnL. InghamRequires cookie*
 Title    Isoflavonoid Phytoalexins from Leaflets of Dalbergia sericea  
 Abstract    The fungus-inoculated leaflets o f Dalbergia sericea pro­ duce several isoflavonoid phytoalexins including the known pterocarpans, medicarpin and maackiain, ana the isofla-van, vestitol. A fourth, previously undescribed, phytoalexin has been identified as 7-methoxy-2',4'-dihydroxyisoflavan (neovestitol) by comparison with synthetic material. 
  Reference    Z. Naturforsch. 34c, 630 (1979); received April 23 1979 
  Published    1979 
  Keywords    Leguminosae, Dalbergia, Isoflavans, Pterocarpans, Phyto­ alexins 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0630_n.pdf 
 Identifier    ZNC-1979-34c-0630_n 
 Volume    34 
116Author    L. Brahmachary, J. DuttaRequires cookie*
 Title     
 Abstract    Phenylethylam ine, Tiger Pheromone, Olfaction in Tiger Pheromones o f the tiger happen to be a mixture o f amines which are "fixed" by lipids. One o f these, found al­ ways in all the four tigers investigated, is phenylethylam ine. This may be a biochem ical marker at a species level. 
  Reference    Z. Naturforsch. 34c, 632—633 (1979); received July 29 1977/ April 11 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0632_n.pdf 
 Identifier    ZNC-1979-34c-0632_n 
 Volume    34 
117Author    ChandraK. Kokate, SamirS. RadwanRequires cookie*
 Title    Enrichment of Solanum khasianum Callus Ge­ nerating Rootlets with Steroidal Glycoalkaloids  
 Abstract    Undifferentiated callus cultures o f Solanum khasianum contain only traces o f steroidal glycoalkaloids, whereas cul­ tures which have just started to generate rootlets contain these com pounds at a level o f up to 5.2% o f the dry weight. Only 0.34% steroidal glycoalkaloids occur in the seeds; they consist predom inantly o f solasonine and solanidine as well as traces o f an unidentified com pound. Conversely, steroi­ dal glycoalkaloids from tissue cultures starting organogene­ sis contain the unidentified com pound as a major fraction, in addition to small am ounts o f solasonine and solanidine. 
  Reference    Z. Naturforsch. 34c, 634—636 (1979); received February 19/ April 12 1979 
  Published    1979 
  Keywords    Solanum khasianum, Callus Cultures, Organogenesis, Ste­ roidal G lycoalkaloids 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0634_n.pdf 
 Identifier    ZNC-1979-34c-0634_n 
 Volume    34 
118Author    Gerhard Bookjans, Peter BögerRequires cookie*
 Title    Algal Ferredoxin-NADP+ Reductase with Dif­ ferent Molecular-Weight Forms  
 Abstract    Plastidic F erredoxin-N A D P+ Reductase, M olecular H etero­ geneity, Dimer Formation Ferredoxin-N A D P + reductase from the microalga Bu-milleriopsis was isolated by a com bination o f affinity chro­ 
  Reference    Z. Naturforsch. 34c, 637—640 (1979); received May 2 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0637_n.pdf 
 Identifier    ZNC-1979-34c-0637_n 
 Volume    34 
119Author    J. R. Mcdermott, A. B. KeithRequires cookie*
 Title    Suppression of Experimental Allergic Neuritis with P2 Protein of PNS Myelin  
 Abstract    Experimental Allergic Neuritis, Peripheral Nervous S y s­ tem, Myelin Specific Proteins Experimental allergic neuritis was induced in the guinea pig with bovine PNS myelin. Treatment with P2 protein at the onset o f the disease markedly reduced the severity o f the clinical signs compared with untreated controls and an­ imals treated with C N S myelin basic protein. The mortality was reduced from 94% in the com bined control group to 50% in the treated group. Saline was a better vehicle for ad­ ministration o f the suppressive inoculation than incom plete Freund's adjuvant. 
  Reference    Z. Naturforsch. 34c, 641—643 (1979); received March 1 2 /April 26. 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0641_n.pdf 
 Identifier    ZNC-1979-34c-0641_n 
 Volume    34 
120Author    Morley Pandula De SilvaRequires cookie*
 Title    3Carbon-Isotope Decrease in Annual-Rings of Twentieth-Century Trees  
 Abstract    Fossil C o2, Biospheric C 0 2 , Juvenile Effect, Tree-Specific Value The steadily increasing global carbon dioxide concentra­ tion is further recognized through the decreasing trend o f 13C / 12C isotopic ratio in the annual rings o f twentieth-cen­ tury trees. The decrease is averaged to about 0.012 per mil per year which is attributed not only as due to anthropogen­ ic fossil-fuel burning but also to the m an's impact on the land pattern. 
  Reference    Z. Naturforsch. 34c, 644 (1979); received March 16/ April 17 1979 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0644_n.pdf 
 Identifier    ZNC-1979-34c-0644_n 
 Volume    34 
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