Published by De Gruyter

Volume 34 Issue 3-4

Issue of Zeitschrift für Naturforschung C

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Journal Overview

Open Access June 2, 2014

Empirical Border Lines of the Apatite Stability Field in the System CaO—P₂O₅—H₂O —Na₂O—CO₂—MX at Room Temperature

F. C. M. Driessens, J. W. E. van Dijk, J. M. P. M. Borggreven

Page range: 165-170

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Abstract

Literature data on equilibria between solid calcium phosphates having the apatite structure and aqueous solutions containing Na + and CO 3 2- 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.

Open Access June 2, 2014

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

H. Wawra, H. Buschmann, H. Formanek, S. Formanek

Page range: 171-178

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Abstract

The lipolysaccharides of two mutants of Salmonella minnesota with known chemical structure were investigated by X-ray methods. Both thickness of the lipopolysaccharide layer and arrangement of the molecular components could be estimated. Using these informations a space-filling model of the structure was built.

Open Access June 2, 2014

Carotenoids of Rhizobia. III. 2',3'-trans-Dihydroxy-2-nor-β, β-carotene-3,4-dione, a Novel Carotenoid from a Mutant of Rhizobium lupini

Peter Beyer, Hans Kleinig, Walter Meister, Gerhard Englert

Page range: 179-180

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Abstract

Nor-Carotenoid, Rhizobium lupini The mutant strain 1-289 of Rhizobium lupini containes in addition to the normal carotenoid pattern a violet carotenoid whose structure was derived by MS and 270 1 H-NMR as 2′,3′-trans-dihydroxy-2-nor-β,β-carotene-3,4-dione. The possible biochemical origin of this compound is dis cussed.

Open Access June 2, 2014

New C₃₀-Carotenoic Acid Glucosyl Esters from Pseudomonas rhodos

Hans Kleinig, Rüdiger Schmitt, Walter Meister, Gerhard Englert, Hans Thommen

Page range: 181-185

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Abstract

The carotenoid pigments of the Gram-negative bacterium Pseudomonas rhodos were identified as 4,4′-diapocarotene-4-oic acid, di (β,ᴅ-glucosyl) 4,4′-diaptocarotene-4,4′-dioate, and β,ᴅ-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).

Open Access June 2, 2014

Nor-Carotenoids as the Major Volatile Excretion Products of Cyanidium

Friedrich Jüttner

Page range: 186-191

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Abstract

Cyanidium caldarium excretes a series of nor-carotenoids. A 110 litre culture was used to isolate and determine the structure of 5 compounds: methylheptone, geranylacetone, β-ionone, dihydrotrimethylnaphthalene, butenylidenetrimethylcyclohexene. An algal bioassay was used to determine their effectivness on the growth of photoautotrophic organisms. The growth of Anabaena, Synechococcus, Nannochloris and Cyanidium was found to be inhibited at concentrations between 10 to 50 ppm.

Open Access June 2, 2014

Thioether Formation of Phycocyanobilin: A Model Reaction of Phycocyanin Biosynthesis

Gerhard Klein, Wolfhart Rüdiger

Page range: 192-195

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Abstract

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 methine 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 presumed last step of phycocyanin biosynthesis, namely the formation of the thioether between cysteine residues of the apoprotein and phycocyanobilin.

Open Access June 2, 2014

Protein Subunits of Bacteriochlorophylls B 802 and B 855 of the Light-Harvesting Complex II of Rhodopseudomonas capsulata

Reiner Feick, Gerhart Drews

Page range: 196-199

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Abstract

The light-harvesting antenna complex II of Rhodopseudomonas capsulata is characterized by two prominent IR-absorption maxima at 802 and 855 nm and three polypeptides of 14,000, 10,000 and 8,000 molecular weight (SDS-polyacrylamide gel electrophoresis). Bacteriochlorophyll (Bchl) is associated with the two lower molecular weight polypeptides. The membranes of the mutant 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 membrane 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 concomitant with and proportional to the loss of absorbance at 802 nm. The absorption peak at 855 nm and the content of the 10,000 molecular 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. Acta 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.

Open Access June 2, 2014

Isolation and Characterization of Flavonol Converting Enzymes from Mentha piperita Plants and from Mentha arvensis Cell Suspension Cultures

Gudrun Frey-Schröder, Wolfgang Barz

Page range: 200-209

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Abstract

Peroxidases from several plants, including horseradish peroxidase, were capable of converting flavonols to the corresponding 2,3-dihydroxyflavanones in presence of H 2 O 2 . Contrastingly, protein extracts from Mentha piperita plants and Mentha arvensis cell suspension cultures perform ed the same enzymatic step in absence of H 2 O 2 , but only with quercetin, not with kaempferol. H 2 O 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 2 O 2 . Enzymes from group I were stimulated by exogenous H 2 O 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 stimulated by H 2 O 2 , but required molecular oxygen and converted 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 participating in the first step of flavonol degradation in plants.

Open Access June 2, 2014

Photoactive ATP Dependent Glutamine Synthetase from Chloroplasts of Setaria italica Beauv

S. Venkataramana, V. S. R. Das

Page range: 210-213

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Abstract

Light and ATP dependent glutamine synthetase (E. C. 6.3.1.2) activity was predominantly located in the mesophyll chloroplasts of Setaria italica Beauv., a C4 plant. ATP served the kinetic requirement while ADP exerted inhibitory effects on the enzyme activity. Sucrose stimulated 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 requirement for ATP.

Open Access June 2, 2014

NADPH-Dependent Thioredoxin Reductase and a New Thioredoxin from Wheat

Guntram Suske, Wolfgang Wagner, Hartmut Follmann

Page range: 214-221

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Abstract

An album in fraction extracted from wheat flour contains thioredoxin reductase (Mr = 65,000) and a heat-stable thioredoxin (M r = 15,000) which are separated on DEAE cellulose and further purified by gel filtration. W heat thioredoxin stimulates E. coli ribonucleotide reductase but not chloroplast fructose-bis-phosphatase. The enzyme is NADPH -dependent (K m = 3.2 X 10 -6 ᴍ) . 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 germinating seeds and green plants.

Open Access June 2, 2014

A PAPS-Dependent Sulfotransferase in Cyanophora paradoxa Inhibited by 5ʹ-AMP, 5ʹ-ADP, and APS

Ahlert Schmidt, Ursula Christen

Page range: 222-228

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Abstract

A 3′-phosphoadenosine-5′-phosphosulfate (PAPS) dependent sulfotransferase was partly purified from Cyanophora paradoxa. This enzyme has a pH-optimum of 8.5 and was found to be specific for PAPS ; the K m for this nucleotide was determined to be 8.3 μᴍ. In crude extracts monothiols like glutathione, mercaptoethanol, or cysteine catalyzed a rate of about 80% of the rate obtained with dithioerythritol; however after purification of the PAPS-sulfotransferase the monothiol activity decreased to about 20% of the rate obtained with dithiols. Addition of heated, crude extract partly restored the monothiol activity. This PAPS-sulfotransferase was inhibited by 5′-ADP and 5′-AMP, and especially by adenosine-5′-phosphosulfate (APS). Practically no inhibition was found with 2′-AMP, 3′-AMP, c-AMP, 3′-5′-ADP and 2′-5′-ADP. The inhibitor constants have been determined to be 430 μᴍ for 5′-AMP; 290 μᴍ for 5′-ADP; and 0.3 μᴍ for APS. These inhibitions seem to be competetive to PAPS. The role of these inhibitors for a possible regulation of assimilatory sulfate reduction are discussed.

Open Access June 2, 2014

On the Oligomycin-Sensitivity and Subunit Composition of the ATPase Complex from Rhodospirillum rubrum

Hans Werner Miiller, Margareta Baltscheffsky

Page range: 229-232

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Abstract

Two alternative procedures for isolation of the oligomycin-sensitive ATPase complex (E. C. 3.6.1.3) from R. rubrum chromatophores are compared with respect to ease, rapidity, and yield. The inhibitory effect of oligomycin on the membrane-bound Ca 2+ -ATPase activity is increased during storage of the chromatophores, whereas the effect of oligomycin on the membrane-bound Mg 2+ -ATPase activity does not change within a week. Oligomycin-sensitivity of the solubilized ATPase complex depends on the isolation procedure. The enzyme complex consists of at least nine different polypeptides with the apparent molecular weights of (1) 67,000, (2) 60,000, (3) 56,000, (4) 35,000, (5) 22,000, (6) 20,000, (7) 17,000, (8) 12,000, (9) 11,000. The polypeptides 2 - 4, 7, and 8 represent subunits of coupling factor 1.

Open Access June 2, 2014

Effect of Divalent Cations on Cation Fluxes Across the Chloroplast Envelope and on Photosynthesis of Intact Chloroplasts

B. Demmig, H. Gimmler

Page range: 233-241

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Abstract

The effect of divalent cations on cation fluxes across the chloroplast envelope and on photo synthetic reactions of intact spinach chloroplasts was investigated. In the absence of EDTA, divalent cations inhibited photosynthetic CO 2 -fixation and PGA-reduction at low PGA concentrations, but had almost no effect on the reduction of OAA, BQ, and on PGA-reduction at high PGA concentrations. The inhibitory effect of Ca 2+ was greater than that of Mg 2+ . Inhibition of photosynthesis was greater when the divalent cations were added in the dark than when added in the light. In spite of its inhibitory effect, Mg 2+ partially restored the Ca 2+ inhibited photosynthesis, indicating the involvement of a Mg 2+ /Ca 2+ antagonism in the inhibitory effect. The inhibitory effect of divalent cations is stronger in a medium with low concentrations of K + than in the presence of 20 - 50 mᴍ KCl. Mg 2+ induced a release of plastidal K + and an in crease of stromal H + concentration. The results indicate that external Mg 2+ in the absence of EDTA does not influence neither photosynthetic electron transport nor photophosphorylation, but inhibits the light activation of some enzymes of the carbon reduction cycle. The latter is assumed to be due to an acidification of the stroma pH and the decrease of endogenous K + level. Since the chloroplast envelope has only a very low permeability towards Mg 2+ , possible mechanisms are discussed by which Mg 2+ changes the properties of the chloroplast envelope and thus secondarily induces the observed effects.

Open Access June 2, 2014

A Radioactive 1,4-Benzoquinone as Inhibitor of the DBMIB-Type in Photosynthetic Electron Transport

Walter Oettmeier

Page range: 242-247

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Abstract

An 125 iodine labelled 1,4-benzoquinone, an analogue of DBMIB, was studied for its interaction with the photosynthetic system of chloroplasts. It is not covalently bound to the thylakoid membrane. Instead, chloroplasts slowly decompose it under release of 125 iodine and formation of a quinone of only small inhibitory potency, i. e. photosynthetic activity is restored after a few minutes. The inhibition in photosynthetic electron transport caused by the 125 iodine labelled 1,4-benzoquinone can also be neutralized by bovine serum albumin to which it binds covalently.

Open Access June 2, 2014

On the Dynamic Model of tR N A : Recent Experimental Findings

Okan Gurel

Page range: 248-252

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Abstract

Recent experimental findings are shown to support various aspects of the dynamic model of tRNA proposed earlier and the interaction between tRNA, mRNA and the ribosomal RNA’s. Extra loop of tRNA molecule is suggested to play a role in recognizing the corresponding amino acids and a correlation is presented between the tRNA molecules and the corresponding amino acids as tabulated by the genetic tableau.

Open Access June 2, 2014

The Molecular Weight of rRNA Precursor Molecules and Their Processing in Higher Plant Cells

Ursula Seitz, Ulrich Seitz

Page range: 253-258

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Abstract

Actively dividing callus cells of higher plants (Petroselinum crispum, Daucus carota, Acer pseudoplatanus) were used to detect the primary gene product of rDNA in vivo. Parsley and carrot cells were labelled with [ 32 P] orthophosphate. Under non-denaturing conditions, in both cases only one high molecular weight rRNA precursor was present on polyacrylamide gels. Its molecular weight did not exceed 2.5 × 10 6 dalton. Under denaturing conditions, 2.0 - 2.1 × 10 6 dalton were determined on formamide gels. This rRNA precursor was already present after a labelling period of 5 -10 min. In parsley cells labelled mature rRNA (25S and 18S) arrived in the cytoplasm 45 min after onset of incubation. In Acer pseudoplatanus incubated with [ 3 H] uridine two rapidly labelled components did emerge from polyacrylamide gels without formamide; their molecular weights were 2.3 and 3.2 - 3.4 × 10 6 dalton. After electrophoresis in formamide, the larger component disappeared, thus indicating that it would be an intermolecular aggregate of different for the existence of rRNA precursors exceeding the molecular weight of 2.5 × 10 6 dalton.

Open Access June 2, 2014

Circular Dichroism and Ultraviolet Absorbance of Calf Thymus DNA in Presence of CH₃HgOH

Michael S. Clegg, Dieter W. Gruenwedel

Page range: 259-265

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Abstract

The changes that one observes upon the addition of CH 3 HgOH in the circular dichroism spectrum and ultraviolet absorbance spectrum of native calf thymus DNA, dissolved in buffered (pH 6.8) solutions of Na 2 SO 4 at pNa 2.0, 1.5, 1.0, and 0.0, respectively (pNa = - log [Na + ]), are shown to be due to denaturation brought about by the organomercurial interacting with the base moieties of the polymer. The changes are characterized by an extensive shift of both spectra to longer wavelengths, by a decrease of the rotational strength of the long-wavelength positive dichroic absorption band, and by an increase in the UV absorbance at λ max . Both the hyperchromicity H λ of calf thymus DNA and the normalized decrease of the rotational strength of its long-wavelength positive dichromic band, Ω , display cooperativity when plotted against the methylmercury concentration pM (pM = - log [CH 3 HgOH] added ) at a given salt strength. Rotational strength data, evaluated by integration of the area under the positive and negative dichroic absorption bands, have been tabulated for selected values of pNa and pM. They are compared with data available from the literature. In absence of CH 3 HgOH, and with varying salt strength, native calf thymus DNA exhibits alterations in the long-wavelength positive dichroic absorption band that are interpreted as representing B → C transitions in agreement with currently held views regarding their origin. Similar salt-induced alterations have been noted in the case of denatured DNA; their meaning in terms of DNA geometry remains unclear at this point in time.

Open Access June 2, 2014

Sequences Homologous to BAV Component of HL23V in Baboon Tissues

L. Mishra, M. A. Baluda

Page range: 266-271

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Abstract

The BAV component of HL23V virus (HL23V-BAB) hybridized to DNA from different Baboon tissues and appears to be an endogenous Baboon virus. Competition hybridization studies show that HL23V-BAB is closely related to viruses isolated from various Baboon species: P. hamadrys, P. papio, and P. cynocephalus. Competition hybridization studies also show that normal Baboon tissues contain more copies of proviral DNA than cells infected in vitro.

Open Access June 2, 2014

Density-Dependent Growth Inhibiting Interactions between 3T3 and SV40-3T3 Cells in Mixed Cultures

Jürgen van der Bosch, Heinz Maier

Page range: 272-278

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Abstract

3T3 cells are shown to reduce SV40-3T3 cell population growth in a density-dependent manner in co-cultures of 3T3 and SV40-3T3 cells. The development of this inhibitory activity roughly parallels the development of density-dependent inhibition of growth in homogeneous 3T3 control cultures. The extent of reduction of SV40-3T3 growth can be manipulated by pretreatment of 3T3 cells with a high serum concentration. SV40-3T3 growth rates are reduced by factors between 10 and 20 under optimum inhibitory conditions as compared to SV40-3T3 growth in control cultures.

Open Access June 2, 2014

Density-Dependent Growth Adaptation Kinetics in 3T 3 Cell Populations Following Sudden [Ca2+] and Temperature Changes. A Comparison with SV40-3T3 Cells

Jürgen van der Bosch, Ilse Sommer, Heinz Maier, Willy Rahmig

Page range: 279-283

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Abstract

Lowered extracellular [Ca 2+ ] causes low growth rates and low stationary cell densities in 3T3 cell cultures as compared to physiological [Ca 2+ ]. Under otherwise constant conditions the extra cellular [Ca 2+ ] determines a stable stationary cell density, which can be readied by increase of net cell number or decrease of net cell number, depending on cell density at the time of [Ca 2+ ] adjustment. SV40-3T3 cells do not show this [Ca 2+ ] dependency. At 39 °C 3T3 and SV40-3T3 cell populations show an increased growth rate at low cell densities as compared to cell populations at 35 °C. Approaching the stationary density the growth rate of both cell sorts is reduced faster at 39 °C than at 35 °C, leading to lower stationary cell densities at 39 °C than at 35 °C. A temperature change from 39 °C to 35 °C or in the opposite direction can affect the stationary cell density of 3T3 cell populations only if applied before reduction of growth rate by density-dependent growth-inhibiting principles has taken place.

Open Access June 2, 2014

Structural Differences in the Tracheal Tapetum of Diurnal Butterflies

Willi A. Ribi

Page range: 284-287

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Abstract

The three-dimensional structure of the tracheal tapetum lucidum, its reflection properties and the resulting eye glow hue were studied in members of the diurnal butterfly families Pieridae, Nymphalidae, Satyridae and Lycaenidae. Two main groups of tapeta can be distinguished by structural and physiological differences. Whereas in pierids the main tracheal trunk at the bottom of the rhabdom bifurcates into two side branches before bifurcating again more distally, the tracheal trunk in the members of the family Nymphalidae, Satyridae and Lycaenidae investigated first divides into four side brandies. A second bifurcation shortly after the first results in eight subbranches which are regularly arranged between adjoining receptor cells. The broad banded reflection colour from incidently illuminated tapetal structures (at the level of the first bifurcation) varies between and within families but does not change significantly within the same eye. Whereas in nymphalids, satyrids and lycaenids the eye glow hue corresponds with the colour of the tapetal reflection, in pierids it is dominated by the coloured receptor screening pigment.

Open Access June 2, 2014

Notizen: Isolation of Batatasin I from Dioscorea dumetorum Rhizomes

M. M. El-Olemy, J. Reisch

Page range: 288-289

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Abstract

Batatasin I was shown to occur in the fresh rhizomes of poisonous yam (Dioscorea dumetorum Pax.,). It was isolated by column chromatography and identified by chromatographic and spectral evidence. Two other unknown phenanthrenes were shown to occur by thin-layer chromatography.

Open Access June 2, 2014

Notizen: Isoflavonoid Phytoalexins of Parochetus communis and Factorovskya aschersoniana

John L. Ingham

Page range: 290-292

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Abstract

Medicarpin has been isolated as a phytoalexin from the fungus-inoculated leaflets of Parochetus communis and Factorovskya aschersoniana; a second isoflavonoid derivative, vestitol, is also produced by F. aschersoniana. Some taxonomic aspects of phytoalexin formation by the title species are briefly discussed.

Open Access June 2, 2014

Notizen: Phytoalexin Production by Species of the Genus Caragana

John L. Ingham

Page range: 293-295

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Abstract

The fungus-inoculated leaflets of 39 Caragana species have been found to variously produce five isoflavonoid phytoalexins including the known pterocarpan derivatives, medicarpin, maackiain, variabilin and pisatin. Small quantities of a previously undescribed C-methylated pterocarpan were obtained from leaflets of C. acanthophylla.

Open Access June 2, 2014

Notizen: Phytoalexin Production by Flowers of Garden Pea (Pisum sativum )

John L. Ingham

Page range: 296-298

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Abstract

The isoflavonoid phytoalexin pisatin has been isolated from fungus-inoculated petals of 16 Pisum sativum cultivars. Pisatin was usually accompanied by trace quantities of maackiain. No other fungitoxic compounds were detected.

Open Access June 2, 2014

Notizen: Electron Microscopy of Synaptonemal Complexes in Semithin Sections

Ondina D. Colman, Juan C. Stockert

Page range: 299-300

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Abstract

The technique of osmium tetroxide fixation followed by a treatment with p-phenylenediamine was applied to mouse testes in order to analyze pachytene nuclei. Observation of Epon semithin sections (0.25 - 0.5 μm) in conventional electron microscopy revealed the presence of positively stained synaptonemal complexes surrounded by unstained chromatin. The present results show that by using this method a suitable contrast and resolution can be achieved for semithin sections, which facilitates the topographical study of synaptonemal complexes.

Open Access June 2, 2014

Notizen: Absence of Microsomal Lipid Peroxidation in Acatalasemic Mice

Christian Steffen

Page range: 301-303

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Abstract

Catalase (E. C. 1.11.1.6) activity and NADPH-depen-dent lipid peroxidation have been measured in liver micro somes from normal and acatalasemic mice. The absence of lipid peroxidation in acatalatic microsomes is not restituted by exogenous catalase as is microsomal methanol oxidation nor is it inhibited by sodium azide, thus suggesting an additional abnormality in these mice.

Open Access June 2, 2014

Notizen: A New Mutant Affecting Aldehyde Oxidase in Drosophila melanogaster

Michael M. Bentley, John H. Williamson

Page range: 304-305

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Abstract

A new locus, Aldox-2, which affects the activity and heat stability of aldehyde oxidase in D. melanogaster is described. The Aldox-2 locus is localized to map position 86 on chromosome 2, between c and px. Aldehyde oxidase activity in Aldox-2 homozygotes is approximately 25 - 30% that of the Oregon-R wild-type control strain. The enzyme from the mutant stock is much more heat labile than is the enzyme from the wild-type strain. Both the activity and heat phenotypes are completely recessive.

Open Access June 2, 2014

Notizen: Der Mäuse-Inzuchtstamm STU. Entwicklung und Eigenschaften

The Inbred Mouse Strain STU. Development and Properties

W. Schäfer

Page range: 306-310

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Abstract

The highly inbred STU mouse strain (up to 100 inbred generations) was developed from a German white mouse colony. Its properties are described with special emphasis on the occurrence of tumors, occurrence of C-type oncornaviruses and on its immunological reactivity. The predominant tumor is a fibrosarcoma (~23% incidence).

About this journal

Objective

A Journal of Biosciences: Zeitschrift für Naturforschung C (ZNC) is an international scientific journal and a community resource for the emerging field of natural and natural-like products.

The journal publishes original research on the isolation (including structure elucidation), bio-chemical synthesis and bioactivities of natural products, their biochemistry, pharmacology, biotechnology, and their biological activity and innovative developed computational methods for predicting the structure and/or function of natural products.

A Journal of Biosciences: Zeitschrift für Naturforschung C (ZNC) welcomes research papers in fields on the chemistry-biology boundary which address scientific ideas and approaches to generate and understand natural compounds on a molecular level and/or use them to stimulate and manipulate biological processes.

Topics

Bio-chemical synthesis and bioactivities of natural products
Isolation (including structure elucidation)
Biochemistry
Biotechnology
Pharmacology
Chemistry
Biology

Article formats

Original research articles, research notes, letters and review articles

Please have a look at the call for papers for two upcoming Special Issues:

Special Issue on CAZymes

Special Issue on Chitin Structures and Pathways as Targets for Biopesticides and Drugs

Volume 34 Issue 3-4

Issue of Zeitschrift für Naturforschung C

Empirical Border Lines of the Apatite Stability Field in the System CaO—P2O5—H2O —Na2O—CO2—MX at Room Temperature

Abstract

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

Carotenoids of Rhizobia. III. 2',3'-trans-Dihydroxy-2-nor-β, β-carotene-3,4-dione, a Novel Carotenoid from a Mutant of Rhizobium lupini

Abstract

New C30-Carotenoic Acid Glucosyl Esters from Pseudomonas rhodos

Abstract

Nor-Carotenoids as the Major Volatile Excretion Products of Cyanidium

Abstract

Thioether Formation of Phycocyanobilin: A Model Reaction of Phycocyanin Biosynthesis

Abstract

Protein Subunits of Bacteriochlorophylls B 802 and B 855 of the Light-Harvesting Complex II of Rhodopseudomonas capsulata

Abstract

Isolation and Characterization of Flavonol Converting Enzymes from Mentha piperita Plants and from Mentha arvensis Cell Suspension Cultures

Abstract

Photoactive ATP Dependent Glutamine Synthetase from Chloroplasts of Setaria italica Beauv

Abstract

NADPH-Dependent Thioredoxin Reductase and a New Thioredoxin from Wheat

Abstract

A PAPS-Dependent Sulfotransferase in Cyanophora paradoxa Inhibited by 5ʹ-AMP, 5ʹ-ADP, and APS

Abstract

On the Oligomycin-Sensitivity and Subunit Composition of the ATPase Complex from Rhodospirillum rubrum

Abstract

Effect of Divalent Cations on Cation Fluxes Across the Chloroplast Envelope and on Photosynthesis of Intact Chloroplasts

Abstract

A Radioactive 1,4-Benzoquinone as Inhibitor of the DBMIB-Type in Photosynthetic Electron Transport

Abstract

On the Dynamic Model of tR N A : Recent Experimental Findings

Abstract

The Molecular Weight of rRNA Precursor Molecules and Their Processing in Higher Plant Cells

Abstract

Circular Dichroism and Ultraviolet Absorbance of Calf Thymus DNA in Presence of CH3HgOH

Abstract

Sequences Homologous to BAV Component of HL23V in Baboon Tissues

Abstract

Density-Dependent Growth Inhibiting Interactions between 3T3 and SV40-3T3 Cells in Mixed Cultures

Abstract

Density-Dependent Growth Adaptation Kinetics in 3T 3 Cell Populations Following Sudden [Ca2+] and Temperature Changes. A Comparison with SV40-3T3 Cells

Abstract

Structural Differences in the Tracheal Tapetum of Diurnal Butterflies

Abstract

Notizen: Isolation of Batatasin I from Dioscorea dumetorum Rhizomes

Abstract

Notizen: Isoflavonoid Phytoalexins of Parochetus communis and Factorovskya aschersoniana

Abstract

Notizen: Phytoalexin Production by Species of the Genus Caragana

Abstract

Notizen: Phytoalexin Production by Flowers of Garden Pea (Pisum sativum )

Abstract

Notizen: Electron Microscopy of Synaptonemal Complexes in Semithin Sections

Abstract

Notizen: Absence of Microsomal Lipid Peroxidation in Acatalasemic Mice

Abstract

Notizen: A New Mutant Affecting Aldehyde Oxidase in Drosophila melanogaster

Abstract

Notizen: Der Mäuse-Inzuchtstamm STU. Entwicklung und Eigenschaften

The Inbred Mouse Strain STU. Development and Properties

Abstract

Empirical Border Lines of the Apatite Stability Field in the System CaO—P₂O₅—H₂O —Na₂O—CO₂—MX at Room Temperature

New C₃₀-Carotenoic Acid Glucosyl Esters from Pseudomonas rhodos

Circular Dichroism and Ultraviolet Absorbance of Calf Thymus DNA in Presence of CH₃HgOH