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1978[X]
101Author    H. Stieve, M. BrunsRequires cookie*
 Title    Extracellular Calcium, Magnesium, and Sodium Ion Competition in the Conductance Control of the Photosensory Membrane of Limulus Ventral N erve Photoreceptor  
 Abstract    The membrane potential in the dark and the saturated response height of the ventral nerve photoreceptor of Lim ulus was measured by an intracellular electrode while the external concentra­ tion of calcium, magnesium and sodium ions was varied. Decreasing the extracellular calcium concentration from 10-2 mol/1 causes a calcium-dependent lowering of the dark membrane potential and at very low concentrations (< ! 10" 8 mol/1 a reversal to ca. + 5 to + 1 1 mV, if the external magnesium concentration is also low. Also, the light response diminishes with decreasing extracellular calcium concentration and disappears at a concentration of 1 0 ~ 9 mol/1. External magnesium can substitute for certain properties of extracellular calcium. Lowering the extracellular sodium concentration from 543 mmol/1 to 30 — 50 mmol/1 reduces the dark membrane potential and the light responses at normal calcium concentration, whereas at low calcium concentration it causes a substantial rise of both. Interp reta tion : The results are in accordance with our working hypothesis that a strong reduc­ tion of the external calcium (and magnesium) concentration causes a calcium concentration dependent opening of " light channels" in the dark. Additional lowering the extracellular sodium concentration counteracts this effect; opening and closing of light channels is controlled by negative binding sites on the cell membrane for which calcium and sodium ions compete with an antagonistic action. 
  Reference    Z. Naturforsch. 33c, 574—579 (1978); received M ay 3 1978 
  Published    1978 
  Keywords    Lim ulus Photoreceptor, Membrane Conductance, Calcium/Sodium Competition 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0574.pdf 
 Identifier    ZNC-1978-33c-0574 
 Volume    33 
102Author    Masayasu Mimura, J. D. MurrayRequires cookie*
 Title    Spatial Structures in a Model Substrate-Inhibition Reaction Diffusion System  
 Abstract    An important new model universal oscillator proposed by Seelig which depends on substrate inhibition is considered. In a finite spatial domain with zero flux boundary conditions and in which the substrates can diffuse it is shown that diffusion-driven instability is possible and can result in finite amplitude spatial structures. Illustrative numerical results are presented which exhibit this behaviour. 
  Reference    Z. Naturforsch. 33c, 580 (1978); received M ay 18 1978 
  Published    1978 
  Keywords    Reaction-Diffusion, Spatial Pattern, Substrate Inhibition 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0580.pdf 
 Identifier    ZNC-1978-33c-0580 
 Volume    33 
103Author    Nakayama, Tokunaru Horie, Masao Tsukayama, Mitsuo Masumura, Shüichi HayashiRequires cookie*
 Title    Mitsuru  
 Abstract    Zephyranthes Candida, Rutin, Kaempferol-3-0-rhamnogluco-side Kaempferol-3-O-rhamnoglucoside, a flavonoid glycoside, was isolated from fresh withe petals of Zephyranthes Candida. Zephyranthes Candida Herb, belonging to Amary-lidaceae (Japanese name: Tamasudare) bears white flowers in fall. From the petals of the plant the iso­ lation o f rutin has already been reported [1 ]. We now isolated an additional flavonoid in the fully ex­ amination of the same source, which was identified as kaempferol-3-0-rhamnoglucoside. The flavonoid fraction isolated from the methanol extract was chromatographed over a silica-gel col­ umn with methyl ethyl ketone-water to give two fla-vonoids, less polar (m. p. 210 — 2 0 ° C) [2 ] and more polar (m. p. 180 — 9 0 ° C). The more polar component was identified as rutin based on the agreement with the mixed m. p., TLC and U V spec­ trum with those o f the authentic sample. The less polar component gave kaempferol (m. p. 273 — 5 °C) [2 ], glucose [TLC , phenyl osazone (m. p. 201 — 2 ° C) ] , and rhamnose [TLC , phenyl osazone (m. p. 179 — 8 0 ° C) ] by acid hydrolysis, and exhaustive methylation of the less polar com­ ponent with diazomethane followed by acid hydro­ lysis gave kaempferol 5,7,4/-trimethyl ether. Besides, the m. p. 191 — 4 °C for anhydrous materials of this flavonoid corresponded to that of the kaempferol-3-0-/?-rutinoside synthesized by Vermes et al. [3 ], and the N M R spectrum of its nonaacetate was superim-posable with that of rutin decaacetate in the sugar 
  Reference    Z. Naturforsch. 33c, 587 (1978); received June 2 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0587_n.pdf 
 Identifier    ZNC-1978-33c-0587_n 
 Volume    33 
104Author    Jürgen Reichling, Hans BeckerRequires cookie*
 Title    Essential Oil of Radix Chamomillae  
 Abstract    The essential oil of chamomil roots has been investigated. Three sesquiterpenoids could be isolated and characterized by their retention time in reference to authentic substances and by their mass spectre. These are a-farnesene, /?-farne-sene and bisabololoxid A. Other sesquiterpenoids and polyen-type substances are present and w ill be identified later. 
  Reference    Z. Naturforsch. 33c, 589 (1978); eingegangen am 5. Juni 1978 
  Published    1978 
  Keywords    Radix Chamomillae, Essential Oil, Sesquiterpenes, a-Farnesene, /?-Farnesene 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0589_n.pdf 
 Identifier    ZNC-1978-33c-0589_n 
 Volume    33 
105Author    Sedat Imre, Laie ErsoyRequires cookie*
 Title    About the Synthesis of some Digitalis Anthra- quinones  
 Abstract    D igita lis Anthraquinones, Synthesis, Structure l,2,5-Trihydroxy-3-methylanthraquinone (4), 
  Reference    Z. Naturforsch. 33c, 592 (1978); received M ay 11 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0592_n.pdf 
 Identifier    ZNC-1978-33c-0592_n 
 Volume    33 
106Author    Bertram Flehmig, Hans Dieter, Hans-Joachim GerthRequires cookie*
 Title      
 Abstract    Hepatitis A-Yirus-Single-Sranded D N A , Electron M icro­ scopy, Length Measurements, Parvovirus Hepatitis A-virus was purified from human stools by three purification steps. Virus was identified by radioimmuno­ assay and purity monitored with immune electron micro­ scopy. Virus particles, serologically and morphologically identical, banded in CsCl in two density ranges at 1.31 — 1.34 g/cm3 and at 1.41 — 1.43 g/cm3. Virions of density 1.31 — 1.34 g/cm3 were shown to contain single-stranded D N A of different size classes. Class I 1.33 kb, class I I 4.61 kb in addition a small amount of molecules was de­ tected with lengths up to 15 kb. 
  Reference    Z. Naturforsch. 33c, 594—5 (1978); received February 7/May 2 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0594_n.pdf 
 Identifier    ZNC-1978-33c-0594_n 
 Volume    33 
107Author    Norbert Rieder, Friedrich SchlechtRequires cookie*
 Title    Discovery of Cilia in the Mid-Gut of Arthopoda  
 Abstract    Cells bearing two cilia are found in the mid-gut of the Phyllopod Leptestheria dahalacensis. These cells seem to be sensory cells. They may be in contact with the muscle cells of the mid-gut. 
  Reference    Z. Naturforsch. 33c, 598—5 (1978); eingegangen am 24. A p ril 1978 
  Published    1978 
  Keywords    Arthropoda, Crustacea, Mid-Gut, Cilia, Sensory Cell 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0598_n.pdf 
 Identifier    ZNC-1978-33c-0598_n 
 Volume    33 
108Author    ChristofC. Krischer, R. D. Dahl, M. KörferRequires cookie*
 Title      
 Abstract    Pigm ent Conversion, Bajrnacle. Photoreceptor Response In chromatic adapted barnacle median and lateral photo­ receptors the two stable states of the photopigment (rhodop-sin R and metarhodopsin M) were interconverted with intense, colored light flashes of 1 ms duration. Only after conversion of the red adapted photoreceptor in K +-Ringer solution with an intense flash the negative early receptor potential, E R P (o f R) gradually appeared detected with an indicator flash. For the opposite conversion (blue adapted, R -*■ M) the gradual appearence of the positive E R P (M) was not measurable in the same time span. In artificial seawater all flash stimuli yielded — irrespective of color — the transient component of the late receptor potential (L R P) . E R P results for the lateral photoreceptor are dis­ cussed in view of an existing kinetic model and an attempt is made to give an explanation which covers the new L R P transient and E R P results for both types of photoreceptor (ap p en d ix). 
  Reference    Z. Naturforsch. 33c, 600 (1978); received December 2 1977/May 16 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0600_n.pdf 
 Identifier    ZNC-1978-33c-0600_n 
 Volume    33 
109Author    JohannesA. Schmitt, Hans-Ulrich Meisch, W. Olfgang ReinleRequires cookie*
 Title    Schwermetalle in höheren Pilzen, IV * Silber Heavy Metals in Higher Fungi, IV Silver  
 Abstract    In several series o f 581 samples, H igher Fungi, especially from the Boletales and Gasteromy­ cetes, were analyzed by atomic absorption spectroscopy on their content of the trace metal silver. The highest Ag-content was found in the Lycoperdales (max. 50 mg/kg dry matter) and in some species o f the genus Boletus (max. 15 mg Ag/kg). The other fungi tested showed a mean silver content of 1 mg/kg or lower. T he species with the highest amounts of the trace metal were found to enrich silver 300 fold compared to the substrate. 
  Reference    Z. Naturforsch. 33c, 608 (1978) 
  Published    1978 
  Keywords    eingegangen 1978 Silver, H igher Fungi, Gasteromycetes, Boletales 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0608.pdf 
 Identifier    ZNC-1978-33c-0608 
 Volume    33 
110Author    Hans-Ulrich Meisch, Wolfgang Reinle, Bernd-Arwed RichterRequires cookie*
 Title    Zur Frage biogener Anreicherungen von Vanadium und Nickel in Pflanzen des Karbonzeitalters The Question of Biogenous Enrichments of Vanadium and Nickel in Plants of the Carbon Age  
 Abstract    O riginal carbonaceous m aterial of fossile carbon plants from the divisions of the Equisetophyta (Calam ariaceae), Lycophyta (Lepidodendraceae, S igillariacea e), Filicophyta (F ilicatae), and Sper-matophyta (Pteridospermatae, Cordaitidae) was analyzed by atomic absorption spectroscopy on its content of the trace metals vanadium and nickel. The average V-content was found to be 1 0 to 100 fold higher than that of the neighbouring coal beds or that of the embedding materials, while the Ni-concentrations were found to be almost in the same range. The highest contents of V and N i were found in the Calamariaceae and in the Pteridospermatae. The V-and Ni-contents of the fossile carbon plants are compared to those of related recent plant genera (clubmosses, horse­ tails, fern s), which were analyzed by 46 representative samples. A possible biogenous enrichment of V and N i in plants of the carbon age is discussed. 
  Reference    Z. Naturforsch. 33c, 616 (1978); eingegangen am 7. Juni/21. Juni 1978 
  Published    1978 
  Keywords    Vanadium, Nickel, Carbon, Carbon Plants, Ferns, Horsetails, Clubmosses 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0616.pdf 
 Identifier    ZNC-1978-33c-0616 
 Volume    33 
111Author    Hans-Ulrich Meisch, Heinz Hoffmann, Wolfgang ReinleRequires cookie*
 Title    Vanadium Catalysis in the Nonenzymatic Transamination of 8-Aminolevulinic Acid  
 Abstract    By nonenzymatic model reactions, the influence o f vanadium (V 0 2+, V 0 3~) and other metal ions (A l3+, F e2+, F e3+, Zn2+, N i2+, Cr3+) on the transamination of 4,5-dioxovaleric acid (D O V A) with L-alanine (A la) to 6 -aminolevulinic acid (<5-ALA) and pyruvic acid (P A) with pyridoxal phosphate (P L P) is investigated. The examinations o f the partial reactions show that V 0 2+, V 0 3~ and F e2+ effectively enhance both conversions, while N i2+ only promotes the conversion of D O V A to 6 -A L A with pyridoxamine phosphate (P M P) . Besides Cr3+ , which inhibits the transaminations, all other metals tried slightly enhance both reactions. The coupled transamination D O VA/A la to (5-ALA/PA with P L P as a catalyst is performed at 40 °C , the extent of the reaction being judged by the amount o f 6 -A L A formed. Am ong all metal ions tested, V 0 2+ and V 0 3~ were found to be the most effective ones. Fe2+, A l 3+ and Fe3+ also slightly enhance the reaction, but all other metals do not influence or inhibit the transamination. In presence of V 0 2+ or V O 3-ions, the optimum pH of the reaction shifts from pH 4 to pH 7.4. The positive influence of vanadium on <5-ALA trans­ amination is discussed in connection with known structures of analogous Schiff base complexes with metal ions. 
  Reference    Z. Naturforsch. 33c, 623 (1978); received March 21 1978 
  Published    1978 
  Keywords    Vanadium, (5-Aminolevulinic Acid, 45-Dioxovaleric Acid, Transamination, Pyridoxal Phosphate, Schiff Base Complexes 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0623.pdf 
 Identifier    ZNC-1978-33c-0623 
 Volume    33 
112Author    Ingolf Richter, KumarD. Mukherjee, Nikolaus WeberRequires cookie*
 Title    Mixed Substrates: trans-and « V -[ l -14C]Monounsaturated Fatty Acids with a Fairly U niform Distribution of Positional Isomers  
 Abstract    Positional Isomers of [1-14C]Monounsaturated Fatty Acids, trans-and c is -[l-14C]O ctadecenoic Acids, trans-and c£s-[l-14C]Eicosenoic Acids, M ixed Substrates Simple methods are described for the preparation of //-<ms-[l-14C]monounsaturated fatty acids and c is -[l-14C]monounsaturated fatty acids, each with a fairly uniform distribution o f positional isomers, which can serve as mixed substrates in biochemical studies. M ethyl trans-[ l -14C ]octa-decenoates and methyl ir<m.s-[l-14C]eicosenoates are prepared by partial catalytic hydrogenation of methyl [1-14C] linolenate and methyl [il-14C] arachidonate, respectively, follow ed by argentation chromatography of the partially hydrogenated products. M ethyl trans-[ l -14C]octadecenoates and methyl trans-[ l -14C]eicosenoates, thus obtained, yield the corresponding methyl ct's-[l-14C]octa-decenoates and methyl c i s -[ l -14C]eicosenoates, respectively, after trans-cis equilibration and argen­ tation chromatography. Hydrolysis of each o f these methyl esters yields the fatty acids. 
  Reference    Z. Naturforsch. 33c, 629 (1978); received June 29 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0629.pdf 
 Identifier    ZNC-1978-33c-0629 
 Volume    33 
113Author    Jochen Berlin, JadeM. WidholmRequires cookie*
 Title    Am ino Acid Uptake by Am ino Acid Analog Resistant Tobacco Cell Lines  
 Abstract    N ic o tia n a ta ba cum , Suspension Cultures, Am ino A cid Analog Resistance, Uptake, Am ino Acids 
  Reference    Z. Naturforsch. 33c, 634 (1978); received July 3 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0634.pdf 
 Identifier    ZNC-1978-33c-0634 
 Volume    33 
114Author    Jochen Berlin, Ulrich MutertRequires cookie*
 Title    Evidence for Distinct Am ino Acid Transport Systems in Cultured Tobacco Cells  
 Abstract    N ic o tia n a tabacum , Suspension Cultures, Uptake, Am ino Acids, Am ino A cid Carriers 
  Reference    Z. Naturforsch. 33c, 641 (1978); received July 3 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0641.pdf 
 Identifier    ZNC-1978-33c-0641 
 Volume    33 
115Author    Brigitte Kopp, Wolfgang Löffelhardt, Wolfgang KubelkaRequires cookie*
 Title    Untersuchungen zur Biogenese der Cardenolide in Convallaria majalis L.: Umwandlungen auf der Geninstufe Cardenolide Biogenesis in Convallaria majalis L  
 Abstract    Con va lla ria m ajalis L., [19-aH ] Strophanthidol, [19-3H ] Strophanthidin, Cardenolide Biogenesis, Translocation [19-3H ] Strophanthidol, fed to leaves of whole plants of C o n va lla ria m ajalis L., was translocated to the rhizomes and roots. Oxidation to [19-3H ] strophanthidin took place in the leaves only. No labelled glycosides of strophanthidol and strophanthidin were found; thus, the aglycones are not precursors of the respective glycosides. It is assumed that the first glycosidation occurs at the C-21 level. 
  Reference    Z. Naturforsch. 33c, 646 (1978); eingegangen am 17. Juli 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0646.pdf 
 Identifier    ZNC-1978-33c-0646 
 Volume    33 
116Author    Bodo ContagRequires cookie*
 Title    Die krebserzeugende W irkung polycyclischer aromatischer Kohlenwasserstoffe The Carcinogenic Effect of Polycyclic Aromatic Hydrocarbons  
 Abstract    The two most important theories on the mode o f action of carcinogenic hydrocarbons are juxtaposed by a new theory. This theory refers >to ideas which have been discussed for a rather long time in silicose research and describes a mechanism whose principle w ill possibly be im ­ portant for the specific effect of some pharmaceutica. 
  Reference    Z. Naturforsch. 33c, 651—659 (1978); eingegangen am 23. März/31. Juli 1978 
  Published    1978 
  Keywords    Carcinogens, Polycyclic Arom atic Hydrocarbons, Specific Adsorption, Carcinogenic Effect 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0651.pdf 
 Identifier    ZNC-1978-33c-0651 
 Volume    33 
117Author    NorbertR K Räuber, Klaus-Dieter Jany, Gerhard PfleidererRequires cookie*
 Title    Ribonuclease A Digestion by Proteinase K  
 Abstract    The digestion of ribonuclease A by proteinase K yielded one m ajor degradation product only, which could not be distinguished from ribonuclease S by electrophoretical and immunological methods. This component (ribonuclease K) possessing full catalytic activity was characterized to be (1 — 20/211— 124) ribonuclease A . Combined action of proteinase K and trypsin on ribonuclease A leads to a significant increase of the inactivation rate which may be useful in the isolation of m R N A from polysomes. 
  Reference    Z. Naturforsch. 33c, 660 (1978); received June 26 1978 
  Published    1978 
  Keywords    Ribonuclease A Digestion, Proteinase K, Ribonuclease K, Limited proteolysis 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0660.pdf 
 Identifier    ZNC-1978-33c-0660 
 Volume    33 
118Author    HansJ. Rurainski, Gerhard MaderRequires cookie*
 Title    The Effect of M g 2+ on the Reduction of N A D P by an Artificial Electron D onor  
 Abstract    The effect of M g 2+ on the light-dependent reduction of N A D P by an artificial electron donor has been investigated with isolated broken chloroplasts. In both short and long wavelength actinic light, addition of the salt under most conditions stimulates the yield and the saturation rate. The magnitude of the stimulation is a function of pH. T he data indicate that previous interpreta­ tions of the M g 2+ effect in this system invoking changes in the spill-over rate between the photo­ systems is no longer tenable. It is suggested that addition of the salt causes activation of inactive reaction centers. 
  Reference    Z. Naturforsch. 33c, 664 (1978); received August 7 1978 
  Published    1978 
  Keywords    Photosynthesis, Photosystem I, Cation Effect, N A D P Reduction 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0664.pdf 
 Identifier    ZNC-1978-33c-0664 
 Volume    33 
119Author    Gerhard Sandmann, Willy HilgenbergRequires cookie*
 Title    Phosphoenolpyruvatcarboxykinase aus Phycomyces blakesleeanus Bgff. Phosphoenolpyruvate Carboxykinase in Phycom yces blakesleeanus Bgff  
 Abstract    P h y c o m y c e s blakesleeanus, Phosphoenolpyruvate Carboxykinase, K m values, Nucleotid Specifity, Sulfuryl Reagents Phosphoenolpyruvate carboxykinase (P E P C K) from P h y c o m y c e s blak esleeanus was partially purified by protamine sulfate precipitation, ammoniumsulfate precipitation, and diethylamino ethyl cellulose (D E A E) treatment. This preparation was employed for the characterization of the enzyme. The K m values for phosphoenolpyruvate (P E P) and A D P were determined as 1.6 and 0.42 mM. The nucleotid specifity was demonstrated for A D P exclusively. The use o f sulfuryl reagents showed the presence of thiol groups sensitive against p-hydroxymercuribenzoate but not effected by N-ethylmaleimide. 
  Reference    Z. Naturforsch. 33c, 667 (1978); received June 16/June 30 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0667.pdf 
 Identifier    ZNC-1978-33c-0667 
 Volume    33 
120Author    Arctodiaptomus Bacillifer, E. L. Crustacea, Hans Seefried, Franz-C CzyganRequires cookie*
 Title    Carotinoid-Garnitur und -Stoffwechsel von  
 Abstract    A rc tod ia p tom u s, Crustacea, Carotenoids, Keto-Carotenoids, Metabolism of Astaxanthin Composition and metabolism of carotenoids in A r c to d ia p to m u s b a cillifer taken from a mountain lake in the Alps have been studied. This copepode contains esters o f astaxanthin (3,3'-dihydroxy-/?,/?-carotene-4,4'-dion) mainly. Besides ^-carotene (ß , /^-carotene) and unesterified zeaxanthin (/?,/?-carotene-3,3'-diol), esters of hydroxyechinenone (3-hydroxy-/? ,/?-caroten-4-one), adonixanthin (3,3'-dihydroxy-/?,/?-caroten-4-one), and zeaxanthin were found. The metabolism of carotenoids in A rc to d ia p to m u s b a cillifer and a possible way o f astaxanthin biosynthesis have been discussed. 
  Reference    Z. Naturforsch. 33c, 671—674 (1978); eingegangen 27. April/12. Juni 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0671.pdf 
 Identifier    ZNC-1978-33c-0671 
 Volume    33 
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