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Facet   section ZfN Section C:Volume 033  [X]
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1978 (180)
1Author    Hans-Ulrich Meisch, JohannesA. Schmitt, Wolfgang ReinleRequires cookie*
 Title    Schwermetalle in Höheren Pilzen, III * Vanadium und Molybdän Heavy Metals in Higher Fungi, III. Vanadium and Molybdenum  
 Abstract    In several series of 212 samples, higher fungi, especially from the genus Amanita and related genera, were analyzed by atomic absorption spectroscopy on their content of the trace metals vanadium and molybdenum. Only vanadium was found to be present in high concentration in the fly agaric mushroom (Amanita muscaria), while 22 of its related species showed the normal V-content of the higher fungi tested. A correlation with the presence of molybdenum could not be detected. A special enrichment of Mo was not found in higher fungi. The analysis of several fruit bodies from A. muscaria showed that the highest V-content was present in the bulb and in the lamellae, both contents increasing with age, while the spores contained only 1 — 2% of the lamellar vanadium. 
  Reference    Z. Naturforsch. 33c, 1 (1978); eingegangen am 12. Dezember 1977/11. Januar 1978 
  Published    1978 
  Keywords    Vanadium, Molybdenum, Higher Fungi, Amanitaceae 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0001.pdf 
 Identifier    ZNC-1978-33c-0001 
 Volume    33 
2Author    German Müller, F. ProsiRequires cookie*
 Title    Verteilung  
 Abstract    von Zink, Kupfer und Cadmium in verschiedenen Organen von Plötzen (Rutilus rutilus L .) aus Neckar und Elsenz Distribution of Zinc, Copper, and Cadmium in Various Organs of Roaches (Rutilus rutilus L.) from the Neckar and Elsenz Rivers 
  Reference    Z. Naturforsch. 33c, 7 (1978); eingegangen am 31. Oktober 1977/3. Januar 1978 
  Published    1978 
  Keywords    Heavy Metals (Zn, Cu, Cd), Roaches (Rutilus rutilus), Fish Organs, Neckar and Elsenz Rivers 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0007.pdf 
 Identifier    ZNC-1978-33c-0007 
 Volume    33 
3Author    W. Grundier, F. KeilmannRequires cookie*
 Title    Nonthermal Effects of Millimeter Microwaves on Yeast Growth  
 Abstract    Weak microwave irradiation of aqueous yeast cultures was found to affect their growth rate in a frequency-selective manner. Depending on frequency (near 42 GHz), both increases and de­ creases of the growth rate were observed. The resonance bandwidths are of the order of 0.01 GHz. Simple thermal effects can be excluded. These findings support theoretical predictions of coherent molecular oscillations activating metabolic processes. 
  Reference    Z. Naturforsch. 33c, 15 (1978); received September 5/October 10 1977 
  Published    1978 
  Keywords    Cell Biology, Cell Growth, Microwave Interaction, Resonance, Coherence 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0015.pdf 
 Identifier    ZNC-1978-33c-0015 
 Volume    33 
4Author    Julio Maranon, OscarM. SorarrainRequires cookie*
 Title    Polarization, Isopotential Maps and Tunneling in Guanine, Cytosine, and Tautomeric Forms  
 Abstract    We have used the CNDO/2-CI method to calculate the isopotential maps for the fundamental state and the direction of the polarizations corresponding to several singlet transitions in the mole­ cules of guanine, cytosine and tautomeric forms. We have also calculated the times for proton tunneling and equilibrium constants between both conformers corresponding to the fundamental and some excited states. The results have been compared with the available experimental data. 
  Reference    Z. Naturforsch. 33c, 23 (1978); received November 2 1977 
  Published    1978 
  Keywords    Polarization, Isopotential, Tunneling, Guanine, Cytosine 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0023.pdf 
 Identifier    ZNC-1978-33c-0023 
 Volume    33 
5Author    H. Wawra, GrazRequires cookie*
 Title    Untersuchung der kristallinen Strukturen in Depotfetten von Tieren mittels Röntgenbeugungsmethoden Investigation of Crystalline Structures in Fats of Animals by X-Ray Scattering Small-Angle-X-Ray-Scattering, Fats  
 Abstract    Fat-praeparates of cow and pork have been investigated by small-angle X-ray scattering methods. Dependent on the temperature these fats show distinct X-ray interference patterns in the small-angle region. Hence complete phasediagrams of the fats in the temperature region between —20 °C and 55 °C could be estimated. Using the intensity distribution of the X-ray scattering the electron-density distribution along one direction of the ground-cells of the fat crystals were calculated. 
  Reference    Z. Naturforsch. 33c, 28 (1978); eingegangen am 7. Oktober 1977 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0028.pdf 
 Identifier    ZNC-1978-33c-0028 
 Volume    33 
6Author    DouglasL. Dorset, WalterA. Pangborn, AnthonyJ. Hancock, IrisS. LeeRequires cookie*
 Title    Influence of Molecular Conformation on the Solid State Packing of 1,2-Diglycerides Study of 1,2-Dipalmitin and Some Structural Analogs by Electron Diffraction, X-Ray Diffraction, and Infrared Spectroscopy  
 Abstract    Diffraction studies on natural 1,2-dipalmitin and on analogs, including those based on the configurational isomers of cyclopentane-l,2,3-triol reveal that the 1,2-diglycerides crystallize from solvent with chain methylene packing identical to the monoclinic form of even-chain alkanes. The chains probably are folded back in "hairpin" fashion as found in phospholipid crystal structures. Acyl shifts are observed to occur in the crystalline solid state at room temperature to give the 1,3-diglyceride. Analogs based on the above-mentioned cyclitols show that isomers with adjacent chains trans to the ring (possibly extended chain packing) or with chains cis to the ring ("hair­ pin") crystallize readily. Both possibly extended chain configurational isomers have the a-form as well as /?'-forms and a /5-polymorph. The hairpin isomers each give a /?'-polymorph but only the all-cts isomer gives an «-form. 
  Reference    Z. Naturforsch. 33c, 39 (1978); received July 29/October 3 1977 
  Published    1978 
  Keywords    Diglycerides, Crystal Structure, Electron Diffraction, X-Ray Diffraction 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0039.pdf 
 Identifier    ZNC-1978-33c-0039 
 Volume    33 
7Author    DouglasL. Dorset, WalterA. Pangborn, AnthonyJ. Hancock, TonC. Van Soest, S. M. GreenwaldRequires cookie*
 Title    Glycerol Conformation and the Crystal Structure of Lipids II. A Further Study of Tripalmitin and Conformationally Fixed Analogs by Small-Angle X-Ray Diffraction and Reflection Electron Diffraction  
 Abstract    The utility of analogs to glycerol-containing lipids based on the configurational isomers of cyclo-pentane-l,2,3-triol for ab initio crystal structure analysis via electron diffraction is assessed further. Such analogs of tripalmitin are examined with the natural triglyceride via low angle X-ray diffrac­ tion. The 1,3/2 (all-irarcs) and 1,2/3 (cis-trans) analogs give long spacing dimensions some 23 Ä greater than found for the ß-2 form of the natural compound, consistent with the long spacing observed for a ß-3 form. The 1,2,3/0 (all-cis) analog gives a long spacing near that of the a-form of the triglyceride. Reflection electron diffraction measurements on the 1,3/2 and 1,2/3 analogs reveal a chain tilt near 60° for both and untilted chains for 1,2,3/0. A more accurate tilt determina­ tion from X-ray long spacings of the homologous series of 1,3/2 pseudotrilaurin to 1,3/2 pseudo-tripalmitin confirm the 67° tilt expected for the ß-3 form. Therefore, given the same T,, methylene subcell, the molecular packing is very close to natural triglycerides. The subtle influences of the cyclopentane ring are overcome for 1,3/2 analogs based on stearic and arachidic acids. This emphasizes the utility of these structural analogs for ab initio crystal structure determinations of glycerol containing lipids. 
  Reference    Z. Naturforsch. 33c, 50 (1978); received October ll/November 28 1977 
  Published    1978 
  Keywords    Triglycerides, Crystal Structure, X-Ray Diffraction, Electron Diffraction 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0050.pdf 
 Identifier    ZNC-1978-33c-0050 
 Volume    33 
8Author    Helmut RoseineyerRequires cookie*
 Title    Immobilisierung von Cytidin und Uridin über 2'.3'-0-cyclische Acetalderivate an Agarose Im mobilisation of Cytidine and Uridine via 2/,3/-0-Cvclic Acetal Derivatives to Agarose F rank Seela  
 Abstract    Agarose Linked Ribonucleosides, Absolute Configuration and Assignment of NMR Signals of Cytidine and U ridine-2',3'-0-acetal Derivatives, Affinity Resins for Nucleoside Converting Enzymes Condensation of cytidine or uridine with ethyl levulinate leads to the acetals la/2a. The reac­ tion would be expected to give mixtures of diastereoisom ers. As shown by 1H and 13C NMR spectroscopy only one diastereoisomer is formed. By spectroscopic comparison of la/2 a with the corresponding adenosine acetal the absolute configuration of the new chiral centre was found to be R. The acetal m ethyl group of la/2 a in exo-location can serve to distinguish the two m ethyl signals of 0-2',3'-isopropylidenecytidine and -uridine in the NM R spectra. On alkaline hydrolysis of the esters the acids lb and 2b are formed, which can be condensed through their carboxyl groups with 6-aminohexylagarose. The affinity resins 3 and 4 contain 7.1 /zmol and 7.6 «m ol ligand/g moist gel respectively. A biospecificity of the new polymers to cytidine-and uridine converting enzymes is expected. 
  Reference    Z. Naturforsch. 33c, 56 (1978); eingegangen am 7. November 1977 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0056.pdf 
 Identifier    ZNC-1978-33c-0056 
 Volume    33 
9Author    Franz Scherr, Theodor GüntherRequires cookie*
 Title    Inhibition of Mg, Ca-ATPase from E. coli by Ruthenium Red  
 Abstract    E. coli, ATPase, Ruthenium Red, Inhibition The membrane-bound, solubilized, and trypsin-treated forms of Mg, Ca-ATPase from E. coli are inhibited by ruthenium red[R R ]. The inhibition is noncompetitive and is reduced at higher sub­ strate concentrations. rc-Butanol-extracted ATPase is not inhibited by ruthenium red and is not activated by KC1. 
  Reference    Z. Naturforsch. 33c, 61 (1978); received November 3 1977/ 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0061.pdf 
 Identifier    ZNC-1978-33c-0061 
 Volume    33 
10Author    C. Postius, H. KindiRequires cookie*
 Title    The Occurrence of Phenylalanine Ammonia-Lyase and Cinnamic Acid /^-Hydroxylase on the Endoplasmic Reticulum of Cell Suspension Cultures of Glycine max  
 Abstract    Subfractionation of Microsomes, Cell Suspension Culture, PAL, Cinnamic Acid p-Hydroxylase 1. The time course of activity of soluble and microsomal phenylalanine ammonia-lyase (PAL) was studied in dark grown cell cultures of soybean (Glycine max). A distinct activity increase of PAL in the soluble and microsomal fraction occurred prior to the stationary phase of the cell culture. Cinnamic acid p-hydroxylase and NADH : cytochrome c reductase, too, exhibited maximal activity in the log phase, 5 days after the transfer of soybean cells to fresh culture medium. 2. Upon subfractionation of the once washed microsomal fraction by sedimentation velocity centrifugation on a sucrose gradient, membranes of the endoplasmic reticulum could be separated from fractions containing mainly membranes from the Golgi apparatus or plasma membranes, respectively. PAL and cinnamic acid p-hydroxylase were found in fractions of endoplasmic reti­ culum whereas no activity of either enzymes could be detected in fractions containing Golgi ap­ paratus or plasma membranes. 3. Repeated washing of microsomal fractions led to a residual membrane-bound PAL re­ presenting about 1% of the total PAL activity of the cells. This residual membrane-bound activity could be solubilized almost completely by Triton X-100 or digitonin at concentrations of 0.5 — 5%. 
  Reference    Z. Naturforsch. 33c, 65 (1978); received November 11 1977 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0065.pdf 
 Identifier    ZNC-1978-33c-0065 
 Volume    33 
11Author    Shaharuddin Aziz, S. N. Hasnain, BarbaraK. ZainRequires cookie*
 Title    Effect of Cortisone on Aspartate and Alanine Aminotransferases in a Desert Lizard  
 Abstract    31/O ctober 10, 1977 Cortisone, Am inotransferases, H ibernation, Lizard 1. Liver and serum aspartate am inotransferase (GOT) and alanine am inotransferase (GPT) activities were measured in a hibernating desert lizard, U rom astix hardw ickii. The levels of both enzymes were found to be lower in hibernation than during the active period, particularly in the liver. 2. A fter intram uscular injection of 2 mg of cortisone acetate there was a rapid rise in the levels of these enzymes with a peak of 18 hours (GOT) and 12 hours (G P T). 3. The response of both enzymes to cortisone was much greater during the active period than during hibernation. 4. GOT showed a much more rapid and greater response to cortisone than GPT. This is in contrast to the response of rat liver where GPT is more responsive to this hormone. 5. These studies indicate that the transferase enzymes of this lizard differ from those of the rat in their sensitivity and tim e of response to cortisone. 
  Reference    Z. Naturforsch. 33c, 70 (1978); received May 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0070.pdf 
 Identifier    ZNC-1978-33c-0070 
 Volume    33 
12Author    Peter Hanfland, Gerd Assmann, Heinz EggeRequires cookie*
 Title    Enzymatic Determination of the Anomeric Structures of Two Blood-Group B Active Glycosphingolipids Recombined with Apolipoproteins  
 Abstract    Anomeric configuration of oligosaccharides usually is established by specific glycosidases. For this purpose detergents achieving w ater solubility of prim arily insoluble glycosphingolipids as sub­ strates have been replaced by delipidated hum an serum high density lipoproteins. The new method, tested by several well characterized glycosphingolipids and glycosidases, finally was applied to the evaluation of anomeric structures of two blood-group B active glycosphingolipids [ceramide hexa-saccharide (B-I) and ceramide octasaccharide (B -II)] from hum an erythrocyte membranes. In both B-I and B-II, a-glycosidic linkage was dem onstrated for the term inal galactose and fucose residues. /?-glycosidic linkage has been evaluated for backbone saccharides. Together with the results pre­ viously obtained by composition analysis, linkage analysis and sequence analysis the following complete structure can be established: B -I: G a lal -> 3Gal (2 l<xFuc) ß \ -> 4G lcN A c^l -> 3Gal/?l -> 4Glc/?l -> I C e r; B-II: Galcd -> 3G al(2 lcvF uc)^ l -> 4GlcNAc/>T 3Gal/?l -> 4G lcN A c^l 3Galy5l -> 4Glc/?l — ICer. 
  Reference    Z. Naturforsch. 33c, 73 (1978); received July 14/October 3 1977 
  Published    1978 
  Keywords    Blood-Group Glycolipids, Anomeric Structure, Enzym atic Degradation, Apolipoproteins 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0073.pdf 
 Identifier    ZNC-1978-33c-0073 
 Volume    33 
13Author    E. Schauenstein, J. Gölles, H. W. Altersdorf Er, R. J. SdiaurRequires cookie*
 Title    Association between the Doubling Time of Various Cells and Tissues, and the SH-Content of Their Soluble Proteins  
 Abstract    The num ber of SH-groups of the soluble proteins (Prot-SH) of 12 different types of animal tum ors and of cultivated chicken fibroblasts increases with decreasing doubling tim e (id) ■ Between Prot-SH and id an inverse association was found with a significance level of 99.5%. After 30 min incubation in vitro, 4-hydroxypentenal (H PE) reacts with different am ounts of the Prot-SH of the investigated cells and tissues. It was found that the absolute, as well as the per­ cental amounts of HPE-reactive Prot-SH increase with decreasing fd > each of the respective inverse associations was found to be highly significant. The tum ors were collected in three groups, each with a corresponding range of td and a mean value for Prot-SH . Taking the Prot-SH of the slowest growing tissue (DENA-hepatoma) as the reference value, the increm ents of Prot-SH were cal­ culated for each of the three groups and were found to be strikingly sim ilar to the num ber of HPE-reactive Prot-SH. The single Prot-SH increm ents of the diverse cell and tissue types compared with DENA-hepatoma were found to be highly significantly and inversely associated with the respective Prot-SH decreases caused by H PE. Hence it may be concluded that H PE reacts preferably with those of the Prot-SH which are of some functional importance for tum or growth and, moreover that the attack on those thiols is the more effective the faster the tumor is growing. 
  Reference    Z. Naturforsch. 33c, 79 (1978); received A pril 5/O ctober 24 1977 
  Published    1978 
  Keywords    Protein-SH-Groups, Tumors, Doubling Time 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0079.pdf 
 Identifier    ZNC-1978-33c-0079 
 Volume    33 
14Author    K. L. Friedm, R. EgelRequires cookie*
 Title    Protein Patterns during Sporulation in Fission Yeast  
 Abstract    Various strains (wild-type and m utants) of Schizosaccharom yces pom be were subjected to sporulation conditions, and analysed with regard to changes in their protein patterns. Trisbuffer-soluble proteins (TS) and DNA-binding proteins (DB) were denatured and separated by poly­ acrylam ide electrophoresis. A fter endogenous nitrogen depletion (the apparent trigger of conjuga­ tion and sporulation) the following alterations were observed: larger TS-proteins were proteolytical-ly degraded; the pattern of DB-proteins underwent several selective changes (reduction, enforce­ ment, or new appearance of individual bands) ; an endonucleolytic DNase activity appeared. Most of these changes were expressed before conjugation, and did not appear in sterile strains. They could, however, be provoked by an abrupt shift to nitrogen-free medium, even in sterile strains. Inhibition studies with cycloheximide revealed at least two phases of protein synthesis specifically needed for sporulation: a very sensitive phase before conjugation, and a more resistant phase lasting until 0.5 h before spore form ation. Medium exchange between heterothallic cultures (h+ and h~) effected certain sporulation-specific alterations of the DB-protein pattern, indicative of diffusible mating-type factors in the culture fluid. 
  Reference    Z. Naturforsch. 33c, 84 (1978); received December 14 1977 
  Published    1978 
  Keywords    Schizosaccharom yces pom be, Conjugation, Sporulation, Endonuclease, Gel Electrophoresis 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0084.pdf 
 Identifier    ZNC-1978-33c-0084 
 Volume    33 
15Author    F. Carlassare, F. Baccichetti, F. Bordin, L. AnselmoRequires cookie*
 Title    Psoralen Photosensitization of L 1210 Leukaemia Cells: an Approach to a New Combined Therapy  
 Abstract    Psoralen Photosensitization, L 1210 Leukaemia, M acrom olecular Synthesis, Combined T herapy Psoralen photosensitization of L 1210 cells has a strong effect on DNA and RNA syntheses and this result appears connected with the psoralen photobinding to DNA. Protein synthesis is less sensitive and its inhibition seems due to a different photochemical interaction, very likely to the psoralen photobinding to RNA. A combined therapy using cyclophosphamide and L 1210 cells psoralen-photoinactivated was perform ed after the leukaem ia transplant, showing a significant decrease in m ortality, even in comparison with the simple treatm ent with the alkilating drug. 
  Reference    Z. Naturforsch. 33c, 92 (1978); received July 29 1977 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0092.pdf 
 Identifier    ZNC-1978-33c-0092 
 Volume    33 
16Author    P. L. SchellRequires cookie*
 Title    Uptake of Polynucleotides by Mammalian Cells XV. Properties and Function of a DNA-Protein Complex Situated in the Outer Membrane of Ehrlich Ascites Tumor Cells  
 Abstract    A pril 28/August 29, 1977 DNA-Membranes, RNA-Uptake, Cells 1) DNA-protein complexes are supposed to be original constituents of the m em brane of Ehrlich ascites tum or cells. These complexes can be attacked at the surface of viable cells by DNase or protease. The DNA is partially em bedded in protein structures. 2) The net charge of this complex is of m ajor im portance for the UNA uptake capacity of the cells. Negatively charged DNA which is situated at the surface hinders RNA uptake. This is the explanation for the stim ulation of RNA uptake by DNase or the decrease in RNA uptake after protease treatm ent. 3) Upon treatm ent of DNA-dcficient complexes with homologous or heterologous DNA the original RNA uptake capacity of the cells is restored but the original conformation of the complex cannot be regained. 4) The DNase action on the complex is tem perature dependent in a sigmoidal fashion. It is m arkedly slowed down at tem peratures below 12 °C. This implies that structural dianges in the complex occur at this transition tem perature which make surface DNA susceptible to DNase. This effect can only be observed in original structures but not in reconstituted ones. 5) Polyanion treatm ent of the cells [poly (L-lysine) ] which increases their RNA uptake capacity, most probably does not interact with the DNA-protein complex. Poly (L-lysine) appears to act at other m em brane sites. 6) The DNA-protein complex has been investigated entirely in situ , i. e. situated in the m em ­ brane of viable cells. 
  Reference    Z. Naturforsch. 33c, 96 (1978); received 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0096.pdf 
 Identifier    ZNC-1978-33c-0096 
 Volume    33 
17Author    Salil Bose, GeorgeE. HochRequires cookie*
 Title    Mg2+-H + Exchange in Chloroplast Membranes in Dark  
 Abstract    Protons are released from unillum inated chloroplasts after the addition of Mg2+. The greatest num ber of protons was measured at pH 6.5 and corresponded to 0.6 mol protons per mol chloro­ phyll. 
  Reference    Z. Naturforsch. 33c, 105 (1978); received January 2 1978 
  Published    1978 
  Keywords    Chloroplast M embranes, Cation Effects, Proton Exchange 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0105.pdf 
 Identifier    ZNC-1978-33c-0105 
 Volume    33 
18Author    Salil Bose, GeorgeE. HodiRequires cookie*
 Title    9-Aminoacridine Binding to Chloroplast Membranes in Dark. Reversal by Mg2+  
 Abstract    Chloroplast Membranes, Acridine Binding, Cation Effects 9-Am inoacridine (9AA) binds to photosynthetic m em branes of unillum inated chloroplasts in low-salt media. The binding was insensitive to the uncouplers of photophosphorylation. The ap ­ parent binding constant was 140 j u m . The binding isotherm as a function of 9AA concentration was sigmoid, and approxim ately 3 mol 9AA/mol chlorophyll was bound at saturating concentrations of 9AA. Addition of M g2+ partially reversed the binding of 9AA in chloroplasts in the dark as observed by a M g2+-induced increase of 9AA fluorescence as well as by spectrophotom etric m easurem ents of free 9AA. It appeared, however, th at use of fluorescence techniques for m easuring free 9AA in tro ­ duced an error in the estim ation of the m agnitude of binding, particularly at low concentration of 9AA (< 7 5 jMM). This is probably due to change in fluorescence yield of m em brane-bound 9AA on addition of cations. The nature of the binding of 9AA to the thylakoid m em branes and the effects of Mg2+ thereupon suggest that both chemical binding of cations and screening of surface charge of the m em branes should be considered in discussing the mechanism of cation action on chloroplast structure and function. Interpretation of these data with respect to heterogeneity of sites of cation action upon or w ithin chloroplast mem branes is discussed. 
  Reference    Z. Naturforsch. 33c, 108 (1978); received January 2 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0108.pdf 
 Identifier    ZNC-1978-33c-0108 
 Volume    33 
19Author    Lester Packer, William CullingfordRequires cookie*
 Title    Stoichiometry of H 2 Production by an in vitro Chloroplast, Ferredoxin, Hydrogenase Reconstituted System  
 Abstract    Studies of the rate and efficiency of H 2 production by a reconstituted system composed of washed chloroplasts, ferredoxin, and hydrogenase reveal th at a significant proportion of the low potential electrons are leaked to H 20 2 production via auto-oxidation of ferredoxin even in the presence of an oxygen trap (glucose and glucose oxidase). U nder optimum conditions of ferredoxin concentration the leak can be m inimized such th at H 2 production is about 70% of the ferricyanide Hill reaction rate. 
  Reference    Z. Naturforsch. 33c, 113 (1978); received October 5 1977 
  Published    1978 
  Keywords    Biophotolysis, H 2 Production, Hydrogenase 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0113.pdf 
 Identifier    ZNC-1978-33c-0113 
 Volume    33 
20Author    B. Johannes, H. BudzikiewiczRequires cookie*
 Title    Zur Photosynthese grüner Pflanzen, VIII [1]: in ^//ro-Sauerstoffaustausch zwischen Carotinoid-Epoxiden und Wasser?  
 Abstract    The in vitro exchange between the epoxide oxygen of carotenoids and that of water reported in literature could not be verified. Our observations rather suggest that oxidation products of the labile polyene system may invalidate 180 enrichment data obtained by indirect analysis. 
  Reference    Z. Naturforsch. 33c, 116 (1978); eingegangen am 12. Oktober/17. November 1977 
  Published    1978 
  Keywords    Carotinoids, 180 Analysis, Oxygen Exchange 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0116.pdf 
 Identifier    ZNC-1978-33c-0116 
 Volume    33 
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