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1979 (244)
21Author    G. Renger, D. Difiore, B. Luuring, P. GräberRequires cookie*
 Title    The Variation of the Electrochromic Difference Spectrum at Various Stages of the Chloroplast Developm ent+  
 Abstract    The flash-induced difference spectrum in the range of 450 — 550 nm of protochloroplasts isolated from pea-leaves greened under intermittent illumination (2 min light, 98 min dark) was measured and compared with that of fully developed chloroplasts from pea leaves. Because of the sensitivity of the decay o fthe absorption changes to the ionophore valinomycin they were shown to mainly be due to an electrochromic bandshift of the membrane pigments (chlorophylls-a, -b and caro-tenoids). The differences in the shape and the amplitude between both spectra are consistently explained within the framework of a recent hypothesis supposed by Sewe and Reich (Z. Natur-forsch. 33 c, 161 — 171 (1978)) by the lack of chlorophyll-b in the protochloroplasts. It is con­ cluded, that the transformation of the protochloroplasts into chloroplasts which is accompanied by the incorporation of the light harvesting complex and the formation of grana stacks does not seriously change the orientation of the field indicating pigments within the membrane with respect of the polarity of the light induced vectorial electron transport. 
  Reference    Z. Naturforsch. 34c, 120 (1979); received October 23 1978 
  Published    1979 
  Keywords    Chloroplast Development, Electric Field, Electrochromism, Pigment Orientation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0120.pdf 
 Identifier    ZNC-1979-34c-0120 
 Volume    34 
22Author    H. B. Leising, D. O. SchachtschabelRequires cookie*
 Title    Enhanced Melanization of Harding-Passey Mouse Melanoma Cells Following Treatment with Exogenous Melanosomes in Monolayer Culture  
 Abstract    D ed ica ted to Prof. Dr. P. Karlson on the O ccasion of H is 60th B irth d a y Melanoma Culture, Melanosomes, Phagocytosis, Melanogenesis Purified melanosomes isolated from subcutaneously growing Harding-Passey melanomas of NMRI-mice were labeled either in vitro with [14C] tyrosine or [14C]DOPA in the melanin portion, or in vivo in the melanin and protein portion following i. p. injection of [14C] tyrosine. Treatment of monolayer cultures of Harding-Passey melanoma cells (HPM-73 line) with such labeled melano­ somes resulted in rapid uptake of label during the first 4 h which leveled off thereafter. A portion of the "incorporated" label could be removed by a 15 min chase with unlabeled melanosomes. Uptake of labeled melanosomes by HPM-73 cells was followed by increased cellular melaniza­ tion which was not only due to melanin derived from incorporated melanosomes but primarily to newly formed melanin. Tyrosinase activity was elevated in melanosome-treated cells. Tyrosinase activity of control cells was significantly reduced following a 24 h exposure to actinomycin D or cycloheximide. On the other side, the same inhibitor treatment of melanosome-pretreated cells resulted in less inhibition of tyrosinase activity. The present findings suggest "melanophagic" properties of cultured melanoma cells resulting in enhanced melanogenesis after phagocytotic uptake of functionally active exogenous melanosomes. 
  Reference    Z. Naturforsch. 34c, 124 (1979); received September 29/November 9 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0124.pdf 
 Identifier    ZNC-1979-34c-0124 
 Volume    34 
23Author    J.F T Spencer, DorothyM. SpencerRequires cookie*
 Title    Osmotic Sensitivity and Tolerance and Proteinase Production in a Strain of Saccharomyces  
 Abstract    A brewing yeast strain, NCYC 1085, unusual in that it sporulated freely and produced diploid spores, was sensitive to the degree of osmotic tension induced by the addition of 1.5 M KC1 or 2.5 m ethylene glycol to yeast extract-peptone-glucose medium, but its progeny, obtained on sporula-tion and dissection of the resulting asci, included a number of osmotic-tolerant strains, the per­ centage of which increased as these strains were also sporulated and dissected. In addition, after repeated isolation of single-spore clones for three or four generations, clones producing zones of liquefaction of gelatin ranging in size from zero to large (approximately 1.5 cm) appeared, with the intensity of hydrolysis increasing in clones obtained from the later generations. The isolation of erythromycin-resistant mutants by manganese treatment was also accompanied by the appearance of osmotic-tolerant and gelatin-liquefying clones. 
  Reference    Z. Naturforsch. 34c, 131 (1979); received November 5 1978 
  Published    1979 
  Keywords    Yeast, Saccharom yces, Extracellular Proteases, Genetics, Osmotolerance 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0131.pdf 
 Identifier    ZNC-1979-34c-0131 
 Volume    34 
24Author    W. Schröder, H. Stieve, I. Classen-LinkeRequires cookie*
 Title    Accessibility of Extracellular Space in the Rhabdome of the Living Isolated Retina of the Crayfish  
 Abstract    Diffusion of the tracer enzyme horseradish peroxidase (HRP) into the extracellular spaces of living isolated crayfish retinas was monitored by light-and electronmicroscopic identification of the reaction product obtained after immobilisation of the enzyme by fixation. During the incuba­ tion in enzyme containing saline (up to 3 hours) the extracellularly recorded electroretinogram (ERG) stayed normal and showed no substantial change. The reaction product of the enzyme HRP was found only extracellularly in the space between the microvilli in the rhabdome. The results indicate an exchange of substances via extracellular pathways between the extra­ cellular side of the photosensory membrane and the bathing fluid in the living isolated crayfish retina. 
  Reference    Z. Naturforsch. 34c, 136 (1979); received November 7 1978 
  Published    1979 
  Keywords    Light Microscopy, Electron Microscopy, Horseradish Peroxidase Tracer Labelling, Electroretinogram, Retina, Extracellular Compartments 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0136.pdf 
 Identifier    ZNC-1979-34c-0136 
 Volume    34 
25Author    M. Heisenberg, K. BöhlRequires cookie*
 Title    Isolation of Anatomical Brain Mutants of Drosophila by Histological Means  
 Abstract    Due to its small size D rosophila m elanogaster can conveniently be used in screening experiments for anatomical brain mutants. A simple method has been designed which allows to process up to 20 identifiable flies as a single preparation in a standard histology routine. Anatomical brain mutants are very frequent. Over 60 mutants were obtained from the inspection of about 3000 brains. So far genetic variations of brain structure fall into 4 classes: (1) "low fidelity" mutants in which brains are less precisely built; (2) "brain shape" mutants with globally or partially reduced brains; (3) "architectonic" mutants which show constructional defects mainly in the repetitive structures of the brain and (4) "vacuolar" mutants with globular "holes" in certain areas of the brain. These mutant classes obviously reflect different aspects of brain development like cell pro­ liferation (2), "wiring" (3) and cell death (4). Some of the mutants may prove to be useful in anatomical, physiological or genetic brain research. 
  Reference    Z. Naturforsch. 34c, 143 (1979); received November 18 1978 
  Published    1979 
  Keywords    Brain, Anatomy, Development, Mutants, D rosophila 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0143.pdf 
 Identifier    ZNC-1979-34c-0143 
 Volume    34 
26Author    Horst HertelRequires cookie*
 Title    Phototaktische Reaktion von Asplanchna priodonta bei monochromatischem Reizlicht Phototactic Reactions of Asplanchna priodonta to Monochromatic Light  
 Abstract    1. The spectral sensitivity curve of the positive phototactic reaction of the rotifer Asplanchna priodon ta has a triple peak. The maxima lie at 363 nm, 453 nm and 552 nm. 2. In the shortest wavelength tested and in the area of 453 to 594 nm was the precision of the phototactic orientation found to be high. In between lies a minimum at 395 nm, above 594 nm occurs a rapid decrease in phototactic orientation. 3. No wavelength specific differences in the way of orientation were found when using dif­ ferent monochromatic test light stimuli. This leads the same mixture of photopigments. 
  Reference    Z. Naturforsch. 34c, 148 (1979); eingegangen am 16. August/20. Oktober 1978 
  Published    1979 
  Keywords    Rotifer, Phototactic Reaction, Spectral Sensitivity, Swimming Track and Speed 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0148.pdf 
 Identifier    ZNC-1979-34c-0148 
 Volume    34 
27Author    RoyJ. Barker, Yolanda Lehner, MichaelR. KunzmannRequires cookie*
 Title    Pesticides and H oney Bees: The Danger of Microencapsulated Formulations  
 Abstract    A p is m ellifera L., Methyl Parathion, PENNCAP-M, Microencapsulation Microcapsules designed to improve the safety and persistence of pesticides are about the same size as pollen. Foraging bees collect pollen contaminated with such microcapsules and pack both together into hive combs. Sustained release formulations remain toxic in food stores of the colony. This combination of accumulation and persistence produces prolonged toxicity for bee colonies. 
  Reference    Z. Naturforsch. 34c, 153 (1979); received October 28 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0153.pdf 
 Identifier    ZNC-1979-34c-0153 
 Volume    34 
28Author    Eckhard Wollenweber, LuisD. Gómez, P.Requires cookie*
 Title      
 Abstract    Calathea lu tea lives in rain forests of Central America. It produces a conspicuous wax coating on the under surface of the leaves. As contribution to the as yet rather poor chemical knowledge on the Marantaceae, the composition of this wax has been analyzed. By GLC and MS it could be shown to consist mainly of odd numbered re-alkanes and even numbered n-alkanols. 
  Reference    Z. Naturforsch. 34c, 157 (1979); received November 14 1978 
  Published    1979 
  Keywords    Calatkea lu tea, Marantaceae, Leaf Wax, n-Alkanes-n-Alkanols 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0157_n.pdf 
 Identifier    ZNC-1979-34c-0157_n 
 Volume    34 
29Author    JohnL. InghamRequires cookie*
 Title      
 Abstract    Peroxide oxidation of cajanol ethyl ether afforded the B ring derived product, 2-methoxy-4-ethoxybenzoic acid. For­ mation of this compound means that the structure of cajanol, a major phytoalexin from Cajanus cajan, must be revised to 5,4'-dihydroxy-7,2'-dimethoxyisoflavanone. 
  Reference    Z. Naturforsch. 34c, 159 (1979); received September 5 1978 
  Published    1979 
  Keywords    Leguminosae, Cajanus, Phytoalexin, Isoflavanone, Structure Revision 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0159_n.pdf 
 Identifier    ZNC-1979-34c-0159_n 
 Volume    34 
30Author    DieterW. Gruenwedel, SusanE. BrownRequires cookie*
 Title      
 Abstract    Single-stranded and methylmercurated T7 DNA is com­ posed of two species as evidenced from the sedimentation pattern displayed during band-sedimentation in self-generat­ ing density gradients as well as during equilibrium-sedi-mentation in Cs2S 0 4 density gradients. Under the given experimental conditions, viz., at pH 9.18 and in presence of 0.1 mM CH3HgOH, the two species band in Cs2S 0 4 with a density difference of 0.008 g/ml. The ratio of the sedimenta­ tion coefficients of the two species is Sw, 20 (fast) Jsw, 20 (slow) = 1.63 at pH 9.18 and in presence of 1.6 mM CH3HgOH. Both native and denatured T7 DNA behave as monodis-perse systems in the absence of CH3HgOH. 
  Reference    Z. Naturforsch. 34c, 162 (1979); received September 21 1978 
  Published    1979 
  Keywords    Sedimentation Heterogeneity, T7 DNA, Methylmercury Complexes 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0162_n.pdf 
 Identifier    ZNC-1979-34c-0162_n 
 Volume    34 
31Author    F.C M Driessens, J.W E Van Dijk, J.M P M BorggrevenRequires cookie*
 Title    Empirical Border Lines of the Apatite Stability Field in the System CaO—P20 5—H 20 —N aaO—C 0 2—MX at Room Temperature  
 Abstract    Literature data on equilibria between solid calcium phosphates having the apatite structure and aqueous solutions containing Na+ and C 0 32-ions were reexamined in view of the present data about the complexation of ions in such systems. Recalculations showed that all solutions were undersaturated or just saturated with respect to either brushite or octocalciumphosphate or more or less finely dispersed calcite and supersaturated with respect to pure hydroxylapatite. Sections through the quasi-sextary phase diagram were constructed which are representative for the system under simulated in vivo conditions. 
  Reference    Z. Naturforsch. 34c, 165 (1979); received December 27 1978 
  Published    1979 
  Keywords    Calcium Phosphate, Apatite Solubility, Sodium Incorporation, Carbonate Incorporation 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0165.pdf 
 Identifier    ZNC-1979-34c-0165 
 Volume    34 
32Author    H. Wawra, H. Buschmann, H. Formanek, S. FormanekRequires cookie*
 Title    Strukturuntersuchung mit Röntgenbeugungsmethoden an Lipopolysacchariden von Salmonella minnesota Mutanten S SF 1111 und R 595 SF 1167 Structural Investigations on Lipopolysaccharides of Mutants S SF 1111 and R 595 SF 1167 of Salmonella minnesota  
 Abstract    The lipolysaccharides of two m utants of Salmonella minnesota with known chemical structure were investigated by X-ray methods. Both thickness of the lipopolysaccharide layer and arrange­ ment of the m olecular components could be estim ated. Using these informations a space-filling model of the structure was built. 
  Reference    Z. Naturforsch. 34c, 171 (1979); eingegangen am 27. Dezember 1978 
  Published    1979 
  Keywords    Small-Angle-X-Ray Scattering, Bacterial Cell W all, Lipopolysaccharides 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0171.pdf 
 Identifier    ZNC-1979-34c-0171 
 Volume    34 
33Author    Peter Beyer, Hans Kleinig, W. Alter Meister, Gerhard EnglertRequires cookie*
 Title    Carotenoids of Rhizobia. III. 2',3'-/ra»s-Dihydroxy-2-nor-ß, ß-carotene-3,4-dione, a N ovel Carotenoid from a Mutant of Rhizobium lupini  
 Abstract    Nor-Carotenoid, R hizobium lupini The m utant strain 1-289 of Rhizobium lupini containes in addition to the norm al carotenoid pattern a violet carotenoid whose structure was derived by MS and 270 ^ -N M R as 2',3 '-trans-dihydroxy-2-nor-/?,/?-carotene-3,4-dione. The possible biochemical origin of this com pound is dis­ cussed. 
  Reference    Z. Naturforsch. 34c, 179 (1979); received November 28 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0179.pdf 
 Identifier    ZNC-1979-34c-0179 
 Volume    34 
34Author    Hans Kleinig, Rüdiger Schmitt, W. Alter Meister, Gerhard Englert, Hans ThommenRequires cookie*
 Title    N ew C30-Carotenoic Acid Glucosyl Esters from Pseudomonas rhodos  
 Abstract    The carotenoid pigments of the Gram-negative bacterium Pseudomonas rhodos were identified as 4,4'-diapocarotene-4-oic acid, di (/?,D-glucosyl) 4,4'-diaptocarotene-4,4'-dioate, and /?,D-glucosyl-4,4'-diapocarotene-4-oate-4'-oic acid. One hydroxy group of the glucose moieties, probably at C (6), was esterified with one of several fatty acids (12:0, 14:0, 14:1, 16:0, 1 6 :1). 
  Reference    Z. Naturforsch. 34c, 181 (1979); received December 14 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0181.pdf 
 Identifier    ZNC-1979-34c-0181 
 Volume    34 
35Author    Friedrich JüttnerRequires cookie*
 Title    Nor-Carotenoids as the Major Volatile Excretion Products of Cyanidium  
  Reference    Z. Naturforsch. 34c, 186 (1979); received December 5 1978 
  Published    1979 
  Keywords    Cyanidium, Nor-Carotenoids, Geranylacetone, /?-Ionone, Methylheptenone, D ihydrotrim ethylnaphthalene, Butenylidenetrim ethylcyclohexene, Algal Bioassay 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0186.pdf 
 Identifier    ZNC-1979-34c-0186 
 Volume    34 
36Author    G.Erhard Klein, WolfHart RüdigerRequires cookie*
 Title    Thioether Formation of Phycocyanobilin: A Model Reaction of Phycocyanin Biosynthesis  
 Abstract    Bile Pigm ents, E thanethiol, Chromic Acid Degradation The reaction of phycocyanobilin dim ethylester (1 a) with ethanethiol is studied. The spectral shifts during a slow reaction correspond to the disappearance of the double bonds at the ethylidene group (595 — > 580 nm) and at the m ethine bridge between rings B and C (365 — ► 395 nm). Chromic acid degradation of the reaction products reveiles that the thiol has been added at the ethylidene double bond yielding two stereoisomers as expected. The reaction is considered as a model reaction for the presum ed last step of phycocyanin biosynthesis, namely the form ation of the thioether between cysteine residues of the apoprotein and phycocyanobilin. 
  Reference    Z. Naturforsch. 34c, 192 (1979); received November 23 1978 
  Published    1979 
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 Identifier    ZNC-1979-34c-0192 
 Volume    34 
37Author    Reiner Feick, Gerhart DrewsRequires cookie*
 Title    Protein Subunits of Bacteriochlorophylls B 802 and B 855 of the Light-Harvesting Complex II of Rhodopseudomonas capsulata  
 Abstract    The light-harvesting antenna complex II of Rhodopseudomonas capsulata is characterized by two prom inent IR-absorption maxima at 802 and 855 nm and three polypeptides of 14,000, 10,000 and 8,000 m olecular weight (SDS-polyacrylamide gel electrophoresis). Bacteriochlorophyll (Bchl) is associated with the two lower m olecular weight polypeptides. The m em branes of the m utant Y 5, which lades reaction center and light harvesting complex I (B 875), were treated with trypsin. The 14,000 polypeptide was rapidly digested by trypsin, but the absorption spectrum of the m em ­ brane and the activity of the cytochrome c oxidase were not altered. Subsequently the 8,000 polypeptide was degraded. The digestion of the 8,000 polypeptide was concom itant with and pro­ portional to the loss of absorbance at 802 nm. The absorption peak at 855 nm and the content of the 10,000 m olecular weight polypeptide were, in contrast, stable for a longer time, but were also lost simultaneously. These results, in combination with the recent publications of Sauer and Austin (Biochemistry 17, 2011, 1978), and Cogdell and Crofts (Biochim. Biophys. A cta 502, 409, 1978) support the idea that the two molecules of Bchl associated with the 10,000 polypeptide are responsible for the 855 nm peak while the one or two mol of Bchl associated with 8,000 polypeptide result in the 802 nm absorption maximum. R hodopseudom onas® capsulata, R. palustris, R. 
  Reference    Z. Naturforsch. 34c, 196 (1979); received December 4 1978 
  Published    1979 
  Keywords    Bacteriochlorophyll-Protein Complexes Rhodopseudomonas capsulata, T rypsin Degradation, IR-Absorption Spectra 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0196.pdf 
 Identifier    ZNC-1979-34c-0196 
 Volume    34 
38Author    Gudrun Frey-Schröder, Wolfgang BarzRequires cookie*
 Title    Isolation and Characterization of Flavonol Converting Enzymes from Mentha piperita Plants and from Mentha arvensis Cell Suspension Cultures  
 Abstract    Flavonols, Peroxidases, D egradation, M entha piperita; M entha arvensis Peroxidases from several plants, including horseradish peroxidase, were capable of converting flavonols to the corresponding 2,3-dihydroxyflavanones in presence of H20 2 . Contrastingly, protein extracts from M entha piperita plants and M entha arvensis cell suspension cultures perform ed the same enzymatic step in absence of H 20 2 , but only with quercetin, not with kaempferol. H 20 2-independent, quercetin converting enzymes were isolated and purified from these extracts, and they could be classified in two groups according to the extent of stimulation of the enzyme reaction by H 20 2 . Enzymes from group I were stim ulated by exogenous H20 2 , and they resembled horse­ radish peroxidase in several aspects. They possessed IAA oxidase activity, but quercetin was the preferred substrate. Enzymes from group II from the plants appeared to be a distinctly different set of enzymes. They were not stim ulated by H20 2 , but required molecular oxygen and con­ verted only 3,3',4'-trihydroxyflavones under aerobic conditions. Also, they showed no Soret-bands and possessed no IAA oxidase activity. These proteins appear to be a new class of enzymes p a rtici­ pating in the first step of flavonol degradation in plants. 
  Reference    Z. Naturforsch. 34c, 200 (1979); received January 19. 1979 
  Published    1979 
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 Identifier    ZNC-1979-34c-0200 
 Volume    34 
39Author    S. Venkataram, V.S R DasRequires cookie*
 Title    Photoactive ATP Dependent Glutamine Synthetase from Chloroplasts of Setaria italica Beauv  
 Abstract    Glutam ine Synthetase, Photophosphorylation, M esophyll and Bundle Sheath Chloroplasts Light and A T P dependent glutam ine synthetase (E. C. 6.3.1.2) activity was predom inantly located in the mesophyll chloroplasts of Setaria italica Beauv., a C4 plant. A TP served the kinetic requirem ent while ADP exerted inhibitory effects on the enzyme activity. Sucrose stim ulated the enzyme activity both in the light and in the dark. The inhibitors of both the cyclic and noncyclic photophosphorylation have suppressed the enzyme activity which suggested the specific requirem ent for ATP. 
  Reference    Z. Naturforsch. 34c, 210—213 (1979); received May 9/D ecem ber 12 1978 
  Published    1979 
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 Identifier    ZNC-1979-34c-0210 
 Volume    34 
40Author    Guntram Suske, Wolfgang Wagner, H. Artm, Ut FollmannRequires cookie*
 Title    NADPH-Dependent Thioredoxin Reductase and a New Thioredoxin from Wheat  
 Abstract    Am perometric SH T itration, Protein Disulfide Reductase, Ribonucleotide Reduction, Thioredoxins, W heat Albumin An album in fraction extracted from wheat flour contains thioredoxin reductase (Mr = 65,000) and a heat-stable thioredoxin (Mr = 15,000) which are separated on DEAE cellulose and further purified by gel filtration. W heat thioredoxin stim ulates E. coli ribonucleotide reductase but not chloroplast fructose-bis-phosphatase. The enzyme is NA DPH -dependent (Km = 3.2 X 1 0 -6 m) . In presence of the thioredoxin it slowly reduces other proteins like insulin or ribonuclease. Therefore it is most likely identical with a protein disulfide reductase (of unknown specificity) previously described in wheat. This new thioredoxin system is a counterpart of the ferredoxin-dependent system found in photosynthetic plant cells, suggesting different, specific mechanisms for regeneration of reduced thioredoxins in germ inating seeds and green plants. 
  Reference    Z. Naturforsch. 34c, 214 (1979); received Decem ber 28 1978 
  Published    1979 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0214.pdf 
 Identifier    ZNC-1979-34c-0214 
 Volume    34 
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