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1998[X]
1Author    Requires cookie*
 Title      
  Reference    Z. Naturforsch. 53c, 1 (1998) 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0001.pdf 
 Identifier    ZNC-1998-53c-0001 
 Volume    53 
2Author    Z. NaturforschRequires cookie*
 Title    Chemical and Biological Characterization of Corticrocin, a Yellow Pigment Formed by the Ectomycorrhizal Fungus Piloderma croceum  
 Abstract    Piloderma croceum, Corticrocin, Mycorrhiza, Mycorradicin Corticrocin is synthesized by mycelia of Piloderma croceum in contrast to mycorradicin, which is deposited into the vacuoles of maize root cells upon colonization with arbuscular mycorrhizal fungi. Corticrocin is formed only when P. croceum is grown in darkness. This indicates that the compound is unlikely of a carotenoid origin which also follows from the chemical structure. Corticrocin is deposited at the surface of the fungal hyphae. The all-£-geometry of the polyunsaturated chain is confirmed by comparing the spectral and chrom ato­ graphic properties of the natural product with a synthetic reference. In tro d u ctio n 
  Reference    Z. Naturforsch. 53c, 4—8 (1998); received November ll/D ecem ber 17 1997 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0004.pdf 
 Identifier    ZNC-1998-53c-0004 
 Volume    53 
3Author    IngridH. Eiser, A. Ngelika, M. Uhr, E. Rich, F. E. Lstn ErRequires cookie*
 Title    Production of OH-Radical-Type Oxidant by Lucigenin  
 Abstract    Superoxide, OH-Radical, Lucigenin, N A D (P)H -R eductase, Paraquat In the presence of NADH-reductases (dihydrolipoamide: NAD oxidoreductase E. C.l.8.1.4 from pig heart or from Clostridium kluyveri\ frequently also addressed as "diaphorases") and N A D H lucigenin strongly increases ethylene production from a-keto-methylthiobutyrate (KMB) as an indicator for strong oxidants of the OH-radical type. These reactions are further stimulated in the presence of Fe3+ ions. With these NADH-"diaphorases", the structurally similar poison, paraquat, in the absence or presence of Fe3+ has no effect. With ferredoxin-NADP reductase (E. C.l.18.1.2.), however, paraquat reacts quasi identical to lucigenin. Superoxide dismutase, catalase, free radical-or O H -scavengers such as mannitol, propylgallate, DABCO, and desferal inhibit the reaction whereas EDTA (in the presence or absence of added Fe3+) is stimulatory. From these data we conclude that the superoxide -indicator LU C is redox-active after unspecific coupling to several almost ubiquitory N A D(P)H -reductases catalyzing monovalent oxygen reduction. Lucigenin thus should no longer be used as a "specific" superoxide indicator. This report is in agreem ent with very recent results by Liochev and Fridovich (Arch. Biochem. Biophys. 337, 115 [1997]) and Vasquez-Vivar et al. (FEBS Lett. 403, 127 (1997). In troductio n 
  Reference    Z. Naturforsch. 53c, 9—1 (1998); received August 27/October 1 1997 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0009.pdf 
 Identifier    ZNC-1998-53c-0009 
 Volume    53 
4Author    Z. NaturforschRequires cookie*
 Title    The Rieske Protein from Purple Sulfur Bacteria Is an Extrinsic Protein  
 Abstract    The mode of membrane attachment of the Rieske iron-sulfur protein from cytochrome be, complex of Rhodospirillum rubrum has been studied using biochemical approaches. In contrast to cytochrome c, the bacterial Rieske protein was extracted from chromato-phores using chaotropic agents (NaSCN, urea, guanidine), an alkaline pH and relatively low concentration of Triton X-100. The results presented here lead to the conclusion, that the Rieske protein from chromato-phores is extrinsic and that their association with the rest of the complex involves hydropho­ bic interactions. In tro d u ctio n 
  Reference    Z. Naturforsch. 53c, 15—20 (1998); received September 30/0ctober 16 1997 
  Published    1998 
  Keywords    Chrom atophor, Cytochrome be, Complex, Rieske Protein, Rhodospirillum rubrum 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0015.pdf 
 Identifier    ZNC-1998-53c-0015 
 Volume    53 
5Author    Siegrid Schoch3, M. Onica IhlRequires cookie*
 Title    Substrate Specificity of Chlorophyllase from Different Plants  
 Abstract    The activity of chlorophyllase (chlorophyll-chlorophyllido-hydrolase, EC 3.1.1.14) ex­ tracted from six different species was com pared with enzyme extracted from leaves of Tree of Heaven. The chlorophyllase activity from Swiss chard was similar to the Tree of Heaven enzyme, all the others were less active or inactive. We tested the substrate specificity with bacteriochlorophyll a, chlorophylls a and b. pheophytins a and b and also the synthetic pig­ ments Zn pheophytins a and b and Zn pyropheophytin a. The natural pigments were the best substrates, but the Zn derivatives were also hydrolysed, except Zn pyropheophytin a which was accepted only by the enzyme extracted from the leaves of Tree of Heaven. 
  Reference    Z. Naturforsch. 53c, 21 (1998); received Septem ber 19/October 11 1997 
  Published    1998 
  Keywords    Chlorophyll, Chlorophyllase, Substrates Specificity, Vegetables, Zn pheophytin 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0021.pdf 
 Identifier    ZNC-1998-53c-0021 
 Volume    53 
6Author    F. Rank Terjung, K. Arlheinz, M. AierRequires cookie*
 Title    Nonphotochemical Quenching of Chlorophyll Fluorescence in Higher Plant Leaves Studied by Delayed Fluorescence Decay Measurements  
 Abstract    Delayed chlorophyll fluorescence decay measurements on the second time scale were ap­ plied to investigate the state of photosystem II under different photosynthetic conditions. Leaves adapted to high and low light intensities were used to study the effects of nonphoto­ chemical quenching (energy quenching) on the photosynthetic state. 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCM U)-treated leaves were used to characterize the photosynthetic state in the absence of a transthylakoid ApH, dithiothreitol (D TT)-treated leaves in the absence of the xanthophyll zeaxanthin. The fast decay components were the most affected by energy quenching as indicated by increased decay times. The slowest decay com ponent was hardly affected, neither in amplitude nor in decay time. The measurem ents indicate a relaxation of energy quenching on the second time scale and the absence of damages in the electron transfer chain of PS II. The constant decay times of the DTT-treated leaf, com parable to those of the DCM U-treated leaf, indicate the obligatory role of zeaxanthin for most of the detected energy quenching. 
  Reference    Z. Naturforsch. 53c, 27—32 (1998); received October 9/October 31 1997 
  Published    1998 
  Keywords    Delayed Fluorescence, Energy Quenching, Pisum sativum, Xanthophyll Cycle 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0027.pdf 
 Identifier    ZNC-1998-53c-0027 
 Volume    53 
7Author    Bdel-B AssetRequires cookie*
 Title    Calcium/Calmodulin Regulated Cell Wall Regeneration in Zea mays Mesophyll Protoplasts  
 Abstract    The composition of newly synthesized cell walls starting from enzymatically isolated Zea mays mesophyll protoplasts was studied. The contents of pectin, cellulose and hemicellulose in addition to the wall-associated proteins were followed in the presence of increasing con­ centrations of calcium ions with or without the calcium channel blockers like lanthanum, lithium ions, verapamil, nifedipine and the calmodulin antagonist trifluperazine. Pectin accu­ mulation was inhibited by all antagonists except lanthanum. Cellulose formation, however, was increased by organic antagonists trifluperazine, verapamil and maximally by nifedipine while it was not affected by the inorganic ions lanthanum or lithium. Hemicellulose accumu­ lated with nifedipine present but significantly decreased by all other antagonists. A dded Ca2+ (5 -1 0 m M) reversed most of the blockers-induced inhibition on pectin and hemicellulose. In the case of cellulose, however, calcium concentration which reversed the inhibitory action of these antagonists was dependent on the antagonist. Starch exhibited little alterations indicat­ ing its minor role in deposition of wall components. Cell wall-associated proteins were nega­ tively affected by lanthanum and verapamil and positively by lithium and nifedipine. G en­ erally, this fraction was found in a negative correlation with pectin levels. Chlorophyll contents were lowered after growth for 48 h; this might be due to repeated cell division. These results are discussed in relation to the mechanism of antagonists and effects of calcium. 
  Reference    Z. Naturforsch. 53c, 33—3 (1998); received November ll/D ecem ber 8 1997 
  Published    1998 
  Keywords    Calcium, Calcium Antagonists, Cell Wall Polysaccharides, Protoplasts, Vicia Faba 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0033.pdf 
 Identifier    ZNC-1998-53c-0033 
 Volume    53 
8Author    E.K N Én, N. Én, É. Th, M. F. RagataRequires cookie*
 Title    Effect of MgCl2 and Phosphatidylglycerol on CaCl2-Mediated Recovery of Oxygen Evolution in a Photosystem II Complex Depleted of the 17 and 24 kDa Extrinsic Proteins  
 Abstract    Phosphatidylglycerol (PG) is an anionic lipid of the thylakoid m em brane of higher plant chloroplasts. PG was shown previously to stimulate the evolution of oxygen in intact pho­ tosystem II (PSII) membranes [Fragata, M., Strzalka, K. and Nenonene, E. K. (1991) J. Pho-tochem. Photobiol. B: Biol 11, 329-342], In this work, a study was undertaken of the effect of MgCl2 and PG on the CaCl2-mediated recovery of oxygen evolution in a PSII complex depleted of the extrinsic proteins (EP) of molecular masses 17 kDa (EP17) and 24 kDa (EP24), hereunder designated d 1724PSII. This molecular system is structurally close to the PSII core complex of cyanobacteria and is therefore useful in the comparative analysis of PSII-PG relationships in cyanobacteria and the higher plants. This work reveals a new aspect of the thylakoid lipids role in the PSII function, namely the PG effect on intact PSII is observed as well in d 1724PSII. The results show that phosphatidylglycerol has the ability to compensate for the loss of EP17 and EP24 in the PSII complex. That is, PG restores the oxygen evolution in d 1724PSII incubated in the presence of MgCl2 and/or CaCl2 to the levels observed in native PSII. M oreover, the site of H 20 degradation in d 17 24PSII, including most probably the pool of calcium and chloride ions, would seem to be protected by phosphatidyl­ glycerol. This suggests that one of the docking sites of PG in the PSII complex is near EP24, inasmuch as this extrinsic protein participates in the regulation of the affinity of the calcium and chloride ions to the water oxidation site. Furtherm ore, taking into account that in d j7 24PSII the PSII core complex is directly exposed to PG, then the phospholipid effect reported here indicates that phosphatidylglycerol might be a functional effector and mem­ brane anchor of the D1 protein in the PSII core complex as was shown recently in the cyanobacterium Oscillatoria chalybea [Kruse, O. and Schmid, G. H. (1995) Z. Naturforsch. 50c, 380-390], 
  Reference    Z. Naturforsch. 53c, 39—4 (1998); received September 1/October 24 1997 
  Published    1998 
  Keywords    Extrinsic Proteins, Oxygen Evolution Recovery, Phosphatidylglycerol, Photosystem II, Salt-Mediated Effects 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0039.pdf 
 Identifier    ZNC-1998-53c-0039 
 Volume    53 
9Author    Chandra Surendra, Subash Sabat3, Prasanna Padhyeb, MohantycRequires cookie*
 Title    Inhibitory Effects of Synthetic Lanthanum-Crown Ether at the Reducing Side of Photosystem II  
 Abstract    Inhibitory effects of lanthanum-crown [La-(Pic)3 (15-crown-6) 3H2OJ.was investigated on the 0 2 evolution activity of photsystem II particles. Lanthanum (La)-crown inhibited the electron flow at the reducing side of PS II complex. Short duration (1 -2 min) treatment of PS II membranes with trypsin partly developed resistance to La-crown inhibition. However, longer proteolytic treatment (>2 min) appeared to expose newer site(s) for La-crown inhibi­ tion. The inhibitory constant (K,) for La-crown was nearly 0.17 | j ,m . This inhibitory capacity is about 4 to 5 times less than the potent PS II inhibitor diuron which also binds at the acceptor side of PS II. The number of binding sites for La-crown was found to be 1 per 20 chlorophyll molecules. The Hill plot analysis showed the presence of three distinct straight lines suggesting that the compound acts at least at three sites. Furthermore, from the slope value (Hill coefficient) it is suggested that two of these sites provide minimum of two binding domains for the inhibitor. 
  Reference    Z. Naturforsch. 53c, 49 (1998); received June 16/September 29 1997 
  Published    1998 
  Keywords    Beta vulgaris, Electron Transport Inhibition, Lanthanum Crown, Photosystem II Particles 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0049.pdf 
 Identifier    ZNC-1998-53c-0049 
 Volume    53 
10Author    A. Jimenez3, R. Mata3, B. Lotina-Hennsenb, A. L. AnayacRequires cookie*
 Title    Interference of l,2,3,4-Tetramethoxy-5-(2-propenyl)benzene with Photosynthetic Electron Transport  
 Abstract    Malmea depressa, Hill Reaction Inhibitor, Photosystem II Inhibition, 1,2,3,4-Tetramethoxy-5-(2-propenyl)benzene, Phenylpropanoids The effect of l,2,3,4-tetramethoxy-5-(2-propenyl)benzene, the major phytogrowth-inhibi­ tory agent isolated from the leaves, stem bark and wood of Malmea depressa (Annonaceae), on several photosynthetic activities has been investigated using freshly lysed spinach chloro-plasts. The results indicate that this compound inhibits proton-uptake, ATP synthesis and electron flow (basal, phosphorylating and uncoupled) in a concentration dependent manner, therefore acting as a Hill reaction inhibitor. Uncoupled electron transport through photosys­ tem I from reduced dichlorophenol-indophenol to methylviologen is unaffected by this com­ pound. On the other hand, uncoupled electron transport through photosystem II from water to dichlorophenol-indophenol, from water to silicomolibdate and from diphenylcarbazide to dichlorophenol-indophenol is inhibited by this phenylpropanoid, suggesting that the site of inhibition is located in the span from P680 to QA. 
  Reference    Z. Naturforsch. 53c, 55 (1998); received August 19/October 14 1997 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0055.pdf 
 Identifier    ZNC-1998-53c-0055 
 Volume    53 
11Author    Ludwig Witter3, Timm Ankea, Olov SternerbRequires cookie*
 Title    A New Inhibitor of Synovial Phospholipase A2 from Fermentations of Penicillium Sp. 62-92  
 Abstract    Penidiamide, Tripeptide, Oxindole, sPLA2, Inhibitor, Penicillium sp. 6 2 -9 2 Penidiamide, a new tripetide containing dehydrotryptamine, glycine and anthranilic acid linked together by two amide bonds, and oxindole were isolated from submerged cultures of Penicillium sp. 6 2 -9 2 . Both compounds preferentially inhibited human synovial phospholi-pase A 2, penidiamide with an IC 5 0 of 30 |im and oxindole of 380 ^xm . With the exception of U 937 cells (leukemia, human), no cytotoxic activities were detected against HL-60-(leukemia, human), HeLa S3-(epitheloid carcinoma, human), BHK 21-(kidney fibroblasts, hamster), and L1210-cells (leukemia, mouse). No antimicrobial activity was detected for oxindole, and only weak antibacterial activity for penidiamide. The structure of penidiamide was elucidated by spectroscopic methods. 
  Reference    Z. Naturforsch. 53c, 60—6 (1998); received September 29 1997 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0060.pdf 
 Identifier    ZNC-1998-53c-0060 
 Volume    53 
12Author    S. I. Smith3, D. K. Olukoya3, A. J. Foxb, A. O. CokercRequires cookie*
 Title    of Campylobacter jejuni and Campylobacter coli  
 Abstract    Ribotypes, Campylobacter, Hae III, Ribosomal RNA and Penner Serotype Diversity based on ribosomal RNA gene-restriction endonuclease digest patterns was de­ tected amongst forty-seven strains of Campylobacter made up of 38 strains of Campylobacter jejuni and 9 strains of Campylobacter coli. Restriction digests of chromosomal DNA prepared by treating with Hae III were probed with an oligonucleotide specific for Campylobacter 16S ribosomal RNA genes. Seventeen distinct hybridization patterns, each indicating the presence of 2 -4 copies of the 16S rRNA gene are encoded in Campylobacter DNA. Differences in fragment patterns were observed not only between members of two species, but also between individual strains of the same species. Ribopattern fragments of 8.71, 7.56, 2.81 and 1.0 kb were characteristic of the majority of C. jejuni, whereas 7.59 and 4.68 kb fragments were commonly present in C. coli. In conclusion, Hae III ribotyping was even more discriminatory than the Penner serotyping of C. jejuni and C. coli, as strains of the same serotype were distinguished. 
  Reference    Z. Naturforsch. 53c, 65—6 (1998); received June 2/September 29 1997 
  Published    1998 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0065.pdf 
 Identifier    ZNC-1998-53c-0065 
 Volume    53 
13Author    Karin Kloos, UrsulaM. Hiisgen, Hermann BotheRequires cookie*
 Title    DNA-Probing for Genes Coding for Denitrification, N2-Fixation and Nitrification in Bacteria Isolated from Different Soils  
 Abstract    Bacteria isolated from different layers of four soils of the Cologne area were analyzed for denitrifying, nitrifying and N2-fixing isolates by colony hybridization using gene probes. In the soils tested, the percentage of denitrifying bacteria among the total population isolated was 3 -8 % (in one case exceptionally 15%) and thus small. Denitrifying bacteria were partic­ ularly enriched in the upper layer (depth ~ 5 cm) and were present only in low amounts at 25 cm depth in two gleysol soils. Nitrate apparently did not determine the distribution of denitrifying bacteria in these soils. The potential denitrification activity of different soil layers coincided with the distribution pattern of isolates assessed by DNA-probing. The total number of bacteria and of denitrifying isolates was considerably higher in or at the roots of plants than in the bulk, root-free soil adjacent to the plants. The percentage of the isolated aerobic N2-fixing bacteria varied between 0 -3 % , and these bacteria could be isolated mainly from the upper 5 cm layer. A small portion of the isolates hybridized with the probe coding for part of one subunit of ammonia monooxygenase from Nitrosomonas europaea. The inves­ tigation showed that DNA-probing can provide useful information about the relative distri­ bution of denitrifying and N2-fixing bacteria in different soils and their layers. 
  Reference    Z. Naturforsch. 53c, 69—8 (1998); received October 14/November 6 1997 
  Published    1998 
  Keywords    DNA-Probing, Colony Hybridizations, Soil Ecology, Denitrification, Nitrification, Nitrogen Fixation 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0069.pdf 
 Identifier    ZNC-1998-53c-0069 
 Volume    53 
14Author    M. J. Martín, C. La-Casa, C. Alarcón-De-La-Lastra, J. Cabeza, I. Villegas, V. MotilvaRequires cookie*
 Title    Anti-Oxidant Mechanisms Involved in Gastroprotective Effects of Quercetin  
 Abstract    The anti-ulcerogenic and anti-oxidant effects of various flavonoids have been frequently reported. We investigated the cytoprotective properties of quercetin, a natural flavone, in gastric mucosal injury induced by 50% ethanol, since in this experimental model the patho­ genesis of the lesions has been related with production of reactive oxygen species. The in­ volvement of neutrophil infiltration and the capacity of this flavonoid to restrain the oxida­ tive process produced in the gastric tissue after ethanol administration were also investigated. Oral pretreatment with the highest dose of quercetin (200 mg/kg), 120 min before absolute ethanol was the most effective anti-ulcer treatment. Thiobarbituric acid reactive substances in the gastric mucosa, an index of lipid peroxidation, were increased by ethanol injury, but the increase was inhibited by the administration of 200 mg/kg of quercetin. This dose also induced a significant enhancement in the levels of mucosal non-protein SH compounds (im­ portant anti-oxidant agents) and in glutathione peroxidase activity. Exposure of the gastric mucosa to 50% ethanol induced a significant increase in myeloperoxidase activity, an index of neutrophil infiltration. Flowever, quercetin was not able to modify the increase in enzy­ matic activity generated by the necrotizing agent. The activity of superoxide dismutase en­ zyme involved in several antioxidant processes was also not significantly modified after quer­ cetin treatment. These results suggest that the anti-ulcer activity of quercetin in this experimental model could be partly explained by the inhibition of lipid peroxidation, through decrease of reactive oxygen metabolites. However, the inhibition of neutrophil infiltration or the increase of su­ peroxide dismutase activity does not appear to be involved in gastroprotective effect of this flavonoid. 
  Reference    Z. Naturforsch. 53c, 82—8 (1998); received July 14/October 31 1997 
  Published    1998 
  Keywords    Flavonoids, Quercetin, Gastroprotection, Anti-Oxidant Effects, Neutrophils 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0082.pdf 
 Identifier    ZNC-1998-53c-0082 
 Volume    53 
15Author    Alexandra Gehrta, GerhardE. Rkel3, TimmA. Nkea, Olov Sterner6Requires cookie*
 Title    Basidiomycete Junghuhnia nitida (Pers.: Fr.) Ryv  
 Abstract    Nitidon, a highly oxidised pyranone derivative produced by the basidiomycete Junghuhnia nitida, has been isolated and its biological activities evaluated. The structure was determined by spectroscopic methods. Nitidon exhibits antibiotic and cytotoxic activities and induces morphological and physiological differentiation of tumor cells at nanomolar concentrations. 
  Reference    Z. Naturforsch. 53c, 89 (1998); received November 7/December 3 1997 
  Published    1998 
  Keywords    Basidiomycete, Junghuhnia nitida, Nitidon, Antibiotic Activities, Induction of Differentiation of HL-60 Cells 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0089.pdf 
 Identifier    ZNC-1998-53c-0089 
 Volume    53 
16Author    Lu Fan, Avigad Vonshak, Aliza Zarka, Sammy BoussibaRequires cookie*
 Title    Does Astaxanthin Protect Haematococcus against Light Damage?  
 Abstract    The photoprotective function of the ketocarotenoid astaxanthin in Haematococcus was questioned. When exposed to high irradiance and/or nutritional stress, green Haematococcus cells turned red due to accumulation of an immense quantity of the red pigment astaxanthin. Our results demonstrate that: 1) The addition of diphenylamine, an inhibitor of astaxanthin biosynthesis, causes cell death under high light intensity; 2) Red cells are susceptible to high light stress to the same extent or even higher then green ones upon exposure to a very high light intensity (4000 |j.mol photon m-2 s_1); 3) Addition of '0 2 generators (methylene blue, rose bengal) under noninductive conditions (low light of 100 (imol photon m -2 s_1) induced astaxanthin accumulation. This can be reversed by an exogenous '0 2 quencher (histidine); 4) Histidine can prevent the accumulation of astaxanthin induced by phosphate starvation. We suggest that: 1) Astaxanthin is the result of the photoprotection process rather than the protective agent; 2) ^ 2 is involved indirectly in astaxanthin accumulation process. 
  Reference    Z. Naturforsch. 53c, 93 (1998); received October 28/November 7 1997 
  Published    1998 
  Keywords    Astaxanthin, Haematococcus, High Light, Reactive Oxygen Species (ROS) 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0093.pdf 
 Identifier    ZNC-1998-53c-0093 
 Volume    53 
17Author    H. Kleszczyńska3, J. Ł. Uczyńskib, S. Witekb, S. PrzestalskiaRequires cookie*
 Title    Hemolytic Activity of Aminoethyl-dodecanoates  
 Abstract    The effect of new lysosomotropic compounds on red blood cell hemolysis and erythrocyte membrane fluidity has been investigated. In earlier studies it was shown that the compounds inhibit the growth of yeast and plasma membrane H+-ATPase activity. The study was per­ formed with eight aminoethyl esters of lauric acid variously substituted at nitrogen atom. Esters of dodecanoic acid were chosen for study because at that chain length dimethylamino-ethyl esters showed maximum activity. The hemolytic activity of the substances studied exhib­ its diversified activity in their interaction with the erythrocyte membrane: they differ in hemolytic activity and affect membrane fluidity differently. Erythrocyte membrane fluidity changes under the effect of those compounds which possess highest hemolytic activity. The hemolytic activity of the aminoesters investigated was found to follow a sequence that de­ pended on basicity (i.e. ability of the protonated form formation) of the compound and its polar head group size. The most active are the compounds that possess not more than four carbon atoms substituted at nitrogen and highest pKa value. 
  Reference    Z. Naturforsch. 53c, 101 (1998); received November 3/December 1 1997 
  Published    1998 
  Keywords    Lysosomotropic Substances, Aminoesters of Fatty Acids, Erythrocyte Membrane, Hemolytic Activity, Fluidity 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0101.pdf 
 Identifier    ZNC-1998-53c-0101 
 Volume    53 
18Author    Stefan Schulz2, George Beccalonib, Ritsuo Nishidac, Yves Roisind, R. I. Vane-Wrightb, JeremyN. Mcneil6Requires cookie*
 Title    2,5-DialkyItetrahydrofurans, Common Components of the Cuticular Lipids of Lepidoptera  
 Abstract    In more than 50 lepidopteran species 2,5-dialkyltetrahydrofurans were identified as com­ ponents of the cuticular lipids. The chain length of these compounds varies between C25 and C37 and both cis-and rram-compounds are present. In addition, previously unknown 2-alkyl-5-(l-hydroxyalkyl)tetrahydrofurans were found in some species. The identification procedure and synthesis of representative compounds are reported. 
  Reference    Z. Naturforsch. 53c, 107 (1998); received October 22/November 17 1997 
  Published    1998 
  Keywords    Lipids, Tetrahydrofurans, Cyclic Ethers, Lepidoptera, Cuticula 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0107.pdf 
 Identifier    ZNC-1998-53c-0107 
 Volume    53 
19Author    M. C. Marcucci3, Jose Rodriguez, F. Ferreresc, V. B. An K O V, Robson Groto6, S. PopovdRequires cookie*
 Title    Chemical Composition of Brazilian Propolis from Sao Paulo State  
 Abstract    Two propolis samples from Sao Paulo State were investigated by GC/MS. 39 compounds were identified, 8 being new for propolis. Both samples showed some similarities in their qualitative composition. In one of them, coum aric acid and its prenylated derivatives predo­ minated, while in the other one triterpenic alcolhols were the main constituents. 
  Reference    Z. Naturforsch. 53c, 117 (1998); received O ctober 7/D ecem ber 8 1997 
  Published    1998 
  Keywords    Propolis, GC/MS, Phenolic Acids, Triterpenes 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0117.pdf 
 Identifier    ZNC-1998-53c-0117 
 Volume    53 
20Author    G. TripathiRequires cookie*
 Title    Thyroid Hormone-Induced Changes in Cytoplasmic and Mitochondrial Proteins of a Teleost  
 Abstract    The effect of triiodothyronine (T 3) on the cytoplasmic and mitochondrial protein contents were studied in the liver and skeletal muscle of a freshwater teleost. The fish exposed to thiouracil for 28 days showed 1 .5 -2 times reduction in the total protein contents of cyto­ plasmic and mitochondrial fractions. A single injection of T 3 to thiouracil exposed fish caused 
  Reference    Z. Naturforsch. 53c, 120 (1998); received June 2/Novem ber 18 1997 
  Published    1998 
  Keywords    Triiodothyronine, Protein, Liver, Skeletal Muscle, Fish 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0120.pdf 
 Identifier    ZNC-1998-53c-0120 
 Volume    53 
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