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1979 (244)
1Author    Peter Rauschenbach, Helmut Simon, W. Illibald Stichler, Heribert MoserRequires cookie*
 Title    Vergleich der Deuterium-und Kohlenstoff-13-Gehalte in Fermentations-und Syntheseethanol Comparison of the Deuterium and Carbon-13 Contents of Ethanol Obtained by Ferm entation and Chemical Synthesis  
 Abstract    D euterium , Carbon-13, Synthetic and Ferm entation Ethanol The ratios of deuterium to hydrogen and carbon-13 to carbon-12 expressed as <5 D %o and d 13C %o , respectively, were determined in ten synthetical ethanols of different origin and compared with those of 28 samples of ethanol which were prepared from plant m aterial grown in different places and at different times. The <5 D values of the synthetic ethanols are between — 117%o and — 140°/oo and those for ethanol obtained by ferm entation between — 200%o and — 272%o . Using glucose samples of different origins with <5 D values between — 3°/oo and — 76%o and w ater of a <5 D value of — 77%o led to ethanol with drastically dim inished deuterium contents ranging from <5 D values of —211 to — 247%o . The differences of the 6 13C values between ethanols obtained by ferm entation of C3 and C4-plant carbohydrates are greater than those between synthetic ethanols and the ethanols obtained from the starch of C3-plants. 
  Reference    Z. Naturforsch. 34c, 1 (1979); eingegangen am 2. November 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0001.pdf 
 Identifier    ZNC-1979-34c-0001 
 Volume    34 
2Author    WimJ. Baas, GerardJ. NiemannRequires cookie*
 Title    Investigations on Hoya species, II. Latex Lipids and Leaf Phenolics of Hoy a bella Hook  
 Abstract    H oy a bella, Asclepiadaceae, Latex, T ri terpenoids, Leaf, Flavonoids In Hoya bella latex a num ber of triterpenols were found, both in the free form and as esters. The m ain triterpenols were /?-amyrin, cycloartenol, lupeol and the rarely occurring isobauerenol; esters of these alcohols which included cinnam ic acid, propionic acid and isovaleric acid were identified. A homologous series of alkanes with carbon chain length ranging from C-20 to C-31 was found. In leaf extracts acylated flavonol glycosides as well as free ferulic acid occurred; the concentration of the latter decreased with increasing leaf age. 
  Reference    Z. Naturforsch. 34c, 5 (1979); received October 9 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0005.pdf 
 Identifier    ZNC-1979-34c-0005 
 Volume    34 
3Author    AlvinN S Tarratt, KarlH. Dahm, Norman Allen, JohnG H Ildebrand, ThomasL. Payne, H. Erbert RollerRequires cookie*
 Title    Bombykal, a Sex Pheromone of the Sphinx Moth Manduca sexta  
 Abstract    Dedicated to Prof. Dr. Hans Brockmann on the Occasion of His 75th Birthday Pheromones, Sex A ttractant, M anduca sexta The first sex pheromone of a Sphinx moth has been isolated from M anduca sexta (L epidoptera: Sphingidae) w ith the aid of an electroantennogram assay. It is attractive to m ales in a field test where its activity m ight be augm ented by a second component in female extracts. Chemical tests and chromatographic properties identify the pheromone as a C16-aldehyde with a pair of conjugated double bonds. (E , Z^-10,12-hexadecadienal, ("bom bykal") was identical with the natural product. The comparison includes chrom atography on three different capillary columns and determ ination of specific activities in the electroantennogram test. 
  Reference    Z. Naturforsch. 34c, 9 (1979); received October 2 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0009.pdf 
 Identifier    ZNC-1979-34c-0009 
 Volume    34 
4Author    Helmut Meyer, Hanns-Georg KilianRequires cookie*
 Title    Stained Native Collagen: Interpretation of the Small Angle X-ray Scattering and Electron Microscopic Pictures in Terms of the Primary Structure  
 Abstract    The average axial electron-density distribution of stained collagen fibers derived from X-ray sm all angle pattern, is shown to be substantially related to the projection of the polar amino acid residues onto the axis of the m icrofibril taking into consideration the staggering of neighbouring molecules. In order to arrive ultim ately at a quantitative representation of the experim ental data, an additional periodic fluctuation of the density in necessity of this regular m icrophase structure for an of collagen fibers will be indicated . 
  Reference    Z. Naturforsch. 34c, 13 (1979); received July 24/November 3 1978 
  Published    1979 
  Keywords    Collagen, Amino Acid Sequence, Sm all Angle X-Ray Scattering, Electron M icroscopy 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0013.pdf 
 Identifier    ZNC-1979-34c-0013 
 Volume    34 
5Author    Ingrid Pilz, K. Arin Goral, FriedrichV D HaarRequires cookie*
 Title    Phenylalanyl-tRNA Synthetase from Baker'Yeast: Structural Organization of the Enzyme and Its Complex with tRNAPhe as Determined by X-Ray Small-Angle Scattering  
 Abstract    The quaternary structure of the phenylalanyl-tRNA synthetase and its complex with tRNAPhe was studied in dilute solutions by small angle X-ray scattering. For the free synthetase the radius of gyration was determ ined as 5.5 nm, the volume 523 nm 3, the maximum diam eter 17.5 nm and the m olecular weight as 260 000 using an isopotential specific volume of 0.735. The overall shape could be best approxim ated by a flat cylinder with dimensions 18.2 n m X l l .5 n m X 4 nm ; the loose structure was approxim ated by building up the cylinder by spheres (diam eter 4.2 n m). The corresponding param eters of the enzyme tRN A complex were the following: radius of gyration 5.9 nm, volume 543 nm 3, maximum diam eter 21 nm and m olecular weight 290 000. These param eters suggest an 1:1 complex, whereby it m ust be assumed that the tRN A m olecule is attached in the extension of the longer axis. From the difference in the distance distribution functions of the free enzyme and the complex it is evident that we have to assume a change of conform ation (contraction) of the enzyme upon the binding of the specific tRNA. 
  Reference    Z. Naturforsch. 34c, 20 (1979); received November 20 1978 
  Published    1979 
  Keywords    X-Ray, Small-Angle, Scattering, Enzyme, Complex 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0020.pdf 
 Identifier    ZNC-1979-34c-0020 
 Volume    34 
6Author    H. Großmann, M. W. Einert, M. LiefländerRequires cookie*
 Title    Acetylcholinesterase aus dem Gift von Bungarus multicinctus. Reinigung und Eigenschaften The Acetylcholinesterase of Bungarus multicinctus Venom. Purification and Properties  
 Abstract    Acetylcholinesterase from Banded krait (Bungarus m ulticinctus) venom has been purified by CM -Sephadex chrom atography and affinity chromatography to a specific activity of 4290 U/mg. The purified enzyme is a glycoprotein. It is free of electrophoretically detectable contam inating proteins. A m olecular weight of 140 000 + 5 000 has been determ ined by gradient gel electro­ phoresis for the native enzyme. It is split into two equal-sized subunits (Mr 70 000 + 2 000) by SDS treatm ent. The N -term inal amino acid analysis gave glycine and serine. The purified acetyl­ cholinesterase can be resolved by disc gel electrophoresis into four and by isoelectric focusing into six isozymes. The p i value of the m ain isozyme has been found to be 5.98 + 0.05. 
  Reference    Z. Naturforsch. 34c, 27 (1979); eingegangen am 2. November 1978 
  Published    1979 
  Keywords    Acetylcholinesterase, Snake Venom, B ungarus m ulticinctus, Affinity Chromatography, Isozymes 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0027.pdf 
 Identifier    ZNC-1979-34c-0027 
 Volume    34 
7Author    Kasem Alef, Jobst-Heinrich KlemmeRequires cookie*
 Title    Assimilatory Nitrate Reductase of Rhodopseudomonas capsulata AD2: A Molybdo-Hemeprotein  
 Abstract    N itrate Reductase, Rhodopseudomonas capsulata, Molybdo-Hemeprotein The assim ilatory n itrate reductase of the phototrophic bacterium Rhodopseudomonas capsulata strain AD2 was purified to hom ogeneity by a combination of ammonium sulfate fractionation, chromatography on DEAE-cellulose and isoelectric focusing (isoelectric point of 4.8). The purified enzyme was active only with reduced viologen dyes or reduced flavin as electron donors. Contrary to other bacterial assim ilatory nitrate reductases, the enzyme was not inhibited by chlorate, but rather accepted this substance as an alternate substrate. The m olecular weight of the enzyme was 185 000 dalton as determ ined by gelfiltration. Subunit analysis by sodium dodecyl sulfate (SDS) gel electrophoresis yielded a single protein band with a molecular weight of 85 000 dalton, sug­ gesting th at the enzyme was composed of two identical subunits. The nitrate reductase contained 0.8 g-atoms m olybdenum per 1.8 5 X 1 0 5 g protein and exhibited absorption maxima at 418, 523 and 552 nm in the reduced state (dithionite as re d u ctan t). The nitrate reductase of Rps. capsulata AD2 is the first prokaryotic enzyme of the assim ilatory type that has been shown to contain heme. 
  Reference    Z. Naturforsch. 34c, 33 (1979); received October 23 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0033.pdf 
 Identifier    ZNC-1979-34c-0033 
 Volume    34 
8Author    HansW. Erner Müller, Udo Schwuléra, Manfred Salzer, Klaus DoseRequires cookie*
 Title    Purification, Subunit Structure, and Kinetics of the Chloroform-Released FjATPase Complex from Rhodospirillum rubrum and Its Comparison with FjATPase Forms Isolated by Other Methods  
 Abstract    A stable and homogeneous adenosine-5'-triphosphatase (ATPase, EC 3.6.1.3) has been solubilized from R hodospirillum rubrum (R . rubrum) chromatophores by chloroform extraction. Purification of the Ca2+-dependent ATPase activity was 200-fold. Ca2+ can be replaced by M g2+, Cd2+, and M n2+ .The K m for Ca-ATP (0.17 m M) is increased about 5-fold during solubilization of the enzyme, whereas the K m values for Mg-ATP (0.029 m M) and Cd-ATP (0.014 m M) are not affected. The chloroform-released A TPase has a molecular weight of 400,000 + 30,000 and consists of the following subunits (m olecular weights in parenthesis): a (58,000), ß (53,500), y (39,000), 6(18,500), and £(14,000). The amino acid composition and the fluorescence spectra are presented. Besides the chloroform-released A TPase complex three other Ca2+-dependent A T Pase forms have been isolated from R. rubrum chromatophores by other methods for comparison. Ultrasonica-tion of the m em branes leads to the release of an ATPase complex which is m ainly composed of a, ß , and 7 -subunits. From an acetone powder extract an A TPase complex could be purified by affinity chromatography which is composed of four kinds of subunits (a, ß , y, 6). The same acetone powder yields an A TPase consisting of only three different types of subunits (a, ß, y) if the final purification step is preparative disc electrophoresis on 6% polyacrylam ide gels instead of affinity chromatography. 
  Reference    Z. Naturforsch. 34c, 38 (1979); received November 10 1978 
  Published    1979 
  Keywords    Rhodospirillum rubrum, F xA TPase Complexes, Subunit Structure, Kinetics 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0038.pdf 
 Identifier    ZNC-1979-34c-0038 
 Volume    34 
9Author    Yun-Fuk Tsang, RagaiK. IbrahimRequires cookie*
 Title    Evidence for the Existence of meta and para Directing O-Methyltransferases in Tobacco Cell Cultures  
 Abstract    The O-methyltransferase of tobacco cell culture was resolved to its meta and para directing forms by chromatography on DEAE-cellulose. Despite similarities in molecular weights and pi values of the two forms, however, evidence from pH optima, SH-group inhibitors, methylation ratios, SDS-acrylamide gels and mixed substrate experiments indicates the existence of two discrete enzymes acting at the meta and para positions of caffeic acid and quercetin, respectively; though the latter enzyme was less substrate specific than its meta counterpart. 
  Reference    Z. Naturforsch. 34c, 46 (1979); received November 17 1978 
  Published    1979 
  Keywords    O-Methyltransferase, Enzyme, meta and para Methylation, Phenols, Tobacco Cell Suspension Culture, Nicotiana tabcaum 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0046.pdf 
 Identifier    ZNC-1979-34c-0046 
 Volume    34 
10Author    Klaus-Peter Rueß, Manfred Liefländer, K. H. HerzogRequires cookie*
 Title    Versuche zur Anreicherung und Solubilisierung des muscarinischen Acetylcholinreceptors aus dem Nucleus caudatus vom Rind Attempts to Enrich and to Solubilize the M uscarinic Acetylcholinereceptor from Bovine Caudate nucleus  
 Abstract    Acetylcholinesterase, Muscarinic-Acetylcholinreceptor, Na+/K +-ATP-Pposphohydrolase, Postsynaptic Membranes, Solubilization Neuronal membranes of postsynaptic origin twofold enriched in acetylcholinesterase, muscarinic acetylcholinereceptor and (Na+/K+)-ATP-Phosphohydrolase, proteins associated with cholinergic nerve excitability, were prepared with yields between 60 and 75% from bovine caudate nucleus. On subfractionation of these membranes an additional twofold enrichment of the mentioned proteins is achieved in different subfractions. SDS-gradient gel electrophoresis shows that these subfractions have slightly different polypeptide compositions. Neuronal membranes of presynaptic origin on the other hand, prepared from purified synapto-somes, possess only small amounts of the mentioned proteins, showing no enrichment with respect to the homogenate. Solubilization of acetylcholinesterase with 1 M NaCl as well as of muscarinic acetylcholinreceptor with 2 m NaCl does not succeed. These proteins are therefore not solely bound by ionic forces to the isolated membranes from bovine caudate nucleus. 
  Reference    Z. Naturforsch. 34c, 51 (1979); eingegangen am 28. September/20. November 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0051.pdf 
 Identifier    ZNC-1979-34c-0051 
 Volume    34 
11Author    P. Tuengler, F. Keilmann, L. GenzelRequires cookie*
 Title    Search for Millimeter Microwave Effects on Enzyme or Protein Functions  
 Abstract    Alcohol Dehydrogenase, Hemoglobin, Microwave Irradiation Recent observations of nonthermal, resonant biological responses to weak millimeter microwave irradiation have led us to investigate whether similar influences exist on enzymatic functions in vitro. We chose (i) the reduction of ethanol in the presence of alcohol dehydrogenase and (ii) the cooperative binding of oxygen on hemoglobin. Using an irradiation intensity near 10 mW/cm2 the frequency was continuously varied from 40 to 115 GHz with a resolution of a few MHz. No micro­ wave influences were detectable within our experimental sensitivity of about 0.1% of the reaction rate in (i), or of the amount of bound oxygen at half saturation in (ii). 
  Reference    Z. Naturforsch. 34c, 60 (1979); received October 2 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0060.pdf 
 Identifier    ZNC-1979-34c-0060 
 Volume    34 
12Author    Buddy Setyono, Hans-Peter Schmid, K. Urt KöhlerRequires cookie*
 Title    The Role of Acidic Proteins from Cytoplasmic Fractions of Krebs II Ascites Cells for Efficient Translation  
 Abstract    RNA-Binding Proteins Acidic proteins with affinity to RNA from cytoplasmic fractions of Krebs II Ascites cells were isolated by means of affinity chromatography on RNA-Sepharose CN-Br-columns. Stepwise elution with 350 m M [K+] and 1000 m M [K+] removed two fractions of proteins both of which are required for the formation of 40S-or 80S-initiation complexes and for efficient translation. 
  Reference    Z. Naturforsch. 34c, 64 (1979); received October 16/November 28 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0064.pdf 
 Identifier    ZNC-1979-34c-0064 
 Volume    34 
13Author    ArminH. Ildebrandt, Rudolf Mengel, HelmutW. SauerRequires cookie*
 Title    Characterization of an Endogenous Transcription Inhibitor from Physarum polycephalum  
 Abstract    A substance has been purified from isolated nuclei of Physarum polycephalum by equilibrium and velocity gradient centrifugations, ion exchange chromatography and gel filtration which has a high molecular weight, can be labeled in vivo with 32P, is heat stable and resistant to amylases, proteases, nucleases and phosphodiesterase but is sensitive to phosphatases or hydrolysis. This material consists of phospate and glycerol. It selectively inhibits in vitro transcription of RNA polymerases, predominantly the homologous enzyme A by binding to the enzyme. In the presence of this inhibitor of transcription a stable RNA polymerase-template complex cannot be formed. Binding to and inactivation of RNA polymerase is reversible at high ionic strength. 
  Reference    Z. Naturforsch. 34c, 76 (1979); received July 3/ November 21 1978 
  Published    1979 
  Keywords    RNA polymerases, Inhibitor, Glycerophosphate, Physarum 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0076.pdf 
 Identifier    ZNC-1979-34c-0076 
 Volume    34 
14Author    A. Stoessl, J. B. StothersRequires cookie*
 Title    The Incorporation of [1,2-13C2] Acetate into Pisatin to Establish the Biosynthesis of Its Polyketide Moiety  
 Abstract    Biosynthesis, 13C-NMR, Phytoalexins, Pisatin The biosynthesis of the polyketide moiety in pisatin has been examined by incorporation ex­ periments with [1,2-13C2] acetate and 13C-NMR measurements. The results establish that the C-5 carbonyl group in the enzyme-bound, open-chain polyketide precursor is reduced before cyclization to form the aryl ring. The specific incorporation attained in these experiments was considerably higher than that reported for earlier studies using singly labelled, radioactive acetate, emphasizing the importance of the timing of precursor addition. 
  Reference    Z. Naturforsch. 34c, 87 (1979); received October 17 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0087.pdf 
 Identifier    ZNC-1979-34c-0087 
 Volume    34 
15Author    FouadM. Fouad, D. W. Aldron-EdwardRequires cookie*
 Title    In vitro Action of Gastric Mucosal Lysosomal Enzymes on Intracellular Gastric Glycoproteins  
 Abstract    The results show that incubation of gastric mucosal cells from rat at pH ~4.5 or in the presence of aspirin is associated with a specific increase in the activity of some acid-hydrolases. Intracellular glycoproteins, isolated by non-degradative techniques from rat or dog fundic mucosal cells, were found to be potential bio-substrates for these acid-hydrolyses. This may suggest that cleavage of the carbohydrate moieties of the intracellular and mucosal cell wall glycoproteins is a fundamental step in the development of gastric ulceration. A model for gastric lesions is proposed and discussed in the light of the results obtained. 
  Reference    Z. Naturforsch. 34c, 90 (1979); received September 29/November 3 1978 
  Published    1979 
  Keywords    Gastric Ulceration, Fundic Glycoproteins, Aspirin, Lysosomal Enzymes 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0090.pdf 
 Identifier    ZNC-1979-34c-0090 
 Volume    34 
16Author    Giuseppe Colacicco, MukulK. Basu, ApurbaK. Ray, M. Urray, W. Ittner, RobertM. RosenbaumRequires cookie*
 Title    Cultured Lung Cells: Effects of Isotopic Dilution and Some Undefined Stimulation on the Incorporation of Radiolabeled Palmitate and Choline into Phosphatidyl Choline (Lecithin)  
 Abstract    Using radiolabels, we studied the effect of certain experimental conditions on the incorporation of choline and palmitate into phosphatidyl choline (lecithin) of cloned type II rat lung cells. When the label was changed from methyl-3H to 1,2-14C the incorporation of choline was reduced to 1/3; in contrast, when the label was moved from 1-14C to 9,10-3H, the incorporation of free pal­ mitate was more than doubled. Removal of choline from the culture medium caused trebling of choline incorporation and appreciable decrease in palmitate uptake, indicating respectively an expected effect of increased choline label concentration in the absence of carrier, and a marked dependence of palmitate on choline incorporation. Removal of fetal calf serum produced more than 2/3 decrease in palmitate incorporation (instead of an expected increase because of palmitate isotope concentration), whereas choline uptake was not affected, meaning respectively that either serum hormones or serum lipids, or both simultaneously, are important for palmitate but not for choline incorporation. This is only the beginning of a host of studies required to clarify the role of fetal calf serum constituents onto lecithin biosynthesis in cultured lung cells and finally gain a full appreciation of the biosynthetic pathways of phosphatidyl choline ("surfactant") in type II cells of alveolar epithelium. 
  Reference    Z. Naturforsch. 34c, 96 (1979); received September 14 1978 
  Published    1979 
  Keywords    Pulmonary Surfactant, Type II Cells, Biosynthetic Pathways, Isotopic Dilution, Serum Hormones 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0096.pdf 
 Identifier    ZNC-1979-34c-0096 
 Volume    34 
17Author    Giuseppe Colacicco, A. Purba, K. Ray, MukulK. Basu, M. Urray, W. Ittner, RobertM. RosenbaumRequires cookie*
 Title    Cultured Lung Cells: Interplay Effects of Beta-Mimetics, Prostaglandins and Corticosteroids in the Biosynthesis of Dipalmitoyl Lecithin  
 Abstract    Cell lines derived from type II lung cells were used to study interplays of substances affecting incorporation of labeled precursors [1-14C] palmitate and [methyl-3H] choline into phosphatidyl choline. Ethanol stimulated markedly biosynthesis of dipalmitoyl phosphatidyl choline in cloned rabbit lung cells; the stimulating action of ethanol was reduced very much by cortisol and less by ritodrine. In the presence of 0.1 m m isoproterenol, two prostaglandins, E2 and F2a, caused marked depressions in the incorporation of both precursors by cell line A 549 derived from human lung adenocarcinoma. One concluded that among the agents studied, ethanol and cortisol are potent antagonists, and so were also the prostaglandins and isoproterenol. 
  Reference    Z. Naturforsch. 34c, 101 (1979); received October 6 1978 
  Published    1979 
  Keywords    Ethanol Metabolism, Beta-Stimulants, Lung Type II Cells, Pulmonary Surfactant, Cortisol 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0101.pdf 
 Identifier    ZNC-1979-34c-0101 
 Volume    34 
18Author    H. K. KleudgenRequires cookie*
 Title    Veränderungen der Pigment-und Prenylchinongehalte in Chloroplasten von Gerstenkeimlingen nach Applikation des Wuchsstoffherbizids MCPA (4-Chlor-2-methylphenoxyessigsäure) Changes of the Amounts of Pigments and Prenylquinones in Chloroplasts of H ordeum vulgare — Seedlings Treated with the Growth Regulating Herbicide MCPA (4-Chloro-2-methylphenoxyacetic Acid)  
 Abstract    MCPA (4-chloro-2-methylphenoxyacetic acid) was applied (1, 10, 100 ^ m/ 1) via the roots to 4 day old etiolated barley seedlings, which were subjected to continuous white light at the same time. The prenyllipids of chloroplasts (chlorophylls, carotenoids, prenylquinones) were determined 7 and 10 days after sowing. Chlorophyll accumulation was reduced by up to 40% compared to the control depending on the herbicide concentration. The formation of carotenoids was inhibited to a lower degree, the ratio xanthophylls/carotenes being increased. There were decreasing ratios of chlorophyll a/benzoquinones and a higher inhibition of the oxidized benzoquinones plastoquinone-9 and a-tocoquinone compared to the reduced forms plastohydroquinone-9 and a-tocopherol. Very similar changes had been observed in earlier works on barley seedlings undergoing an artificial degeneration of their chloroplasts in the dark. It is suggested that MCPA induces a state of senescence in the prenyllipid metabolism of the photosynthetic apparatus, which is cor­ related with respect to structure, to a reduction of the pigment antennae. 
  Reference    Z. Naturforsch. 34c, 106 (1979); eingegangen am 13. November 1978 
  Published    1979 
  Keywords    Growth-Regulator, Prenyllipids, Chloroplasts, Senescence 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0106.pdf 
 Identifier    ZNC-1979-34c-0106 
 Volume    34 
19Author    H. K. KleudgenRequires cookie*
 Title    Die Wirkung von Simazin auf die Bildung der plastidären Prenyllipide in Keimlingen von Hordeum vulgare L. Effect of Simazine on Formation of Chloroplasts Prenyllipids in Seedlings of H ordeum vulgare L  
 Abstract    Barley seedlings were grown for 7, 10 or 13 days under continuous white light (Fluora lamps) on a nutrient solution containing simazine (2-chloro-4,6-bis-(ethylamino)-s-triazine, 10, 100 j u m) . Accumulation of chlorophylls and in part of carotenoids was increasingly enhanced depending on age and concentrations applied. The ratio chlorophyll a/b decreased on this line in 10 and 13 day old plants, the ratio xanthophylls//?-carotene and the ratio chlorophyll a/prenylquinones (plasto-quinone-90x. + red. , a-tocopherol, a-tocoquinone) increased. The way how these prenyllipid ratios are changed in 10 and 13 day old plants is characteristic of a shade type adaptation, as it was shown earlier for other herbicides inhibiting photosystem II. In 7 day old plants the ratio chlorophyll a/prenylquinones decreased. Photosynthetic activity (Hill-reaction) was enhanced in the simazine plants. The ratio chlorophyll a/b was higher, the ratio xanthophylls//?-carotene was lower than in the older seedlings. Similar changes of prenyllipid ratios like in 7 day seedlings and a higher Hill activity were also found in plants grown under blue light (sun type adaptation) as compared to red light (shade type adaptation). This points to similar metabolic changes in the chloroplasts which could be related to a common site of regulation, perhaps the endogenuous cytokinins. The Hill activity, increasing with age in the 10 and 13 day plants, indicates that the mode of action of simazine may be a multiple process resulting to a parallel formation of shade type and sun type characteristics. 
  Reference    Z. Naturforsch. 34c, 110 (1979); eingegangen am 13. November 1978 
  Published    1979 
  Keywords    Herbicide, Simazine, Prenyllipids, Chloroplasts, Regulation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0110.pdf 
 Identifier    ZNC-1979-34c-0110 
 Volume    34 
20Author    J. Freise, P. Magerstedt, F. W. SchmidtRequires cookie*
 Title    Die in vitro und in vivo Stabilität des Einschlusses von Methotrexat in negativ geladenen Liposomen nach Sterilfiltration The in vitro and in vivo Stability of the Entrapment of Methotrexate in Negatively Charged Liposomes after Sterile Filtration  
 Abstract    The preparation of sterile artificial liposomes (phosphatidylcholine: cholesterol: dicethylphos-phate = 5 : 5 : l) by Millipore® filtration is described. Conditions for storing liposome entrapped Methotrexate have been found which allow storage of the drug in the entrapped form over a period of at least 4 months. It is shown that intravenously injected liposome entrapped Metho­ trexate is retained for at least 15 hours in the particulate form. During this time no free Metho­ trexate is detectable in the blood. 
  Reference    Z. Naturforsch. 34c, 114 (1979); eingegangen am 16. August/10. November 1978 
  Published    1979 
  Keywords    Methotrexate, Liposomes, Endocytosis, Cell Membrane 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0114.pdf 
 Identifier    ZNC-1979-34c-0114 
 Volume    34 
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