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1996[X]
41Author    WaqarA. Hm, M. Uhammad Nazir3, FaqirM. Ohammad Chaudhary3, Ashfaq AhmRequires cookie*
 Title    Hydrocarbon Distribution in Epicuticular Waxes of Five Euphorbia Species  
 Abstract    The distribution pattern of hydrocarbons in the surface waxes of five species of Euphor­ biaceae, E.caducifolia, E.helioscopia, E.milii, E.royleana and E.tirucalli was studied. In addi­ tion to hom ologous series of n-alkanes, minor quantities of unsaturated and branched hy­ drocarbons were also detected. Some of the branched chain hydrocarbons could be explained as having originated from isoprene units and the substituents corresponding to diterpenes and triterpenes. 
  Reference    Z. Naturforsch. 51c, 291 (1996); received October 30 1995/January 2 1996 
  Published    1996 
  Keywords    Euphorbiaceae, Hydrocarbons, Epicuticular Wax 
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 Identifier    ZNC-1996-51c-0291 
 Volume    51 
42Author    Eckhard Wollenweber, Henrich Birgit, M. Karin, JamesN. Anna, RoitmRequires cookie*
 Title    Lipophilic Exudate Constituents of Some Rosaceae from the Southwestern USA  
 Abstract    otanik d er Technischen H ochschule. S chnittspahnstraße 3. D-64287 D arm stad t. B undesrepublik D eutschland Z. N aturforsch. 51c, 2 9 6 -3 0 0 (1996); received January 9/February 12, 1996 R osaceae, E p icuticular M aterial, Flavonoid A glycones, T riterpene Acids The lipophilic epicuticular m aterial of four shrubby R osaceae from the Southw estern U S A has been studied. They all exhibit trite rp e n e acids as m ajor products. Adenostomci sparsifol­ ium and Cowania mexicana var. glaber, the two species in which glandular structures and a lipophilic excretion are obvious, p roduce free flavonoid aglycones as well. In A den ostom a, m ost of these are very rare com pounds. Cowania exhibits some trivial and one rare flavone. In Cercocarpus montanus var. glaber and in Fallugia paradoxa the epicuticular m aterial is devoid of flavonoids. 
  Reference    Z. Naturforsch. 51c, 296 (1996) 
  Published    1996 
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 Identifier    ZNC-1996-51c-0296 
 Volume    51 
43Author    A. El-Shazlyac, A.-MA. Teya3, L. W. Itteb, M. WinkcRequires cookie*
 Title    Quinolizidine Alkaloid Profiles of Retama raetam, R. sphaerocarpa and R. monosperma  
  Reference    Z. Naturforsch. 51c, 301 (1996) 
  Published    1996 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0301.pdf 
 Identifier    ZNC-1996-51c-0301 
 Volume    51 
44Author    Andrey Moskalenko, Olga Toropygina, Nina KuznetsovaRequires cookie*
 Title    Does the B820 Subcomplex of the B880 Complex Retain Carotenoids?  
 Abstract    Z. N aturforsch. 51c, 309 -3 1 8 (1996); received D ecem b er 12, 1995/February 8, 1996 Purple B acteria, Light-H arvesting C om plex, B880, B820, D issociation, T ransform ation, C arotenoid A study is rep o rted on the m odification of the B880-RC assem bly of Chromatium minutis-simum during octyl-ß-D -glucopyranoside/dodecyl-ß-D -m altoside/D eriphat polyacrylam ide gel electrophoresis followed by electroelution with dodecyl-ß-D -m altoside and high perform ance liquid chrom atography with octyl-ß-D -glucopyranoside according to the m eth o d developed by K erfeld et al. (Biochim. Biophys. A cta 1185, 1 9 3 -2 0 2 [1994a]) for isolation of the B820 subcom plexes o f Chromatium purpuratum. The B880-RC assem bly o f Chromatium minutissi-mum isolated by electrophoresis was co n tam in ated by the B 8 0 0 -8 5 0 com plex. It was fu rth er separated into four com ponents, th ree o f which w ere in ag reem en t with the cited work: (i) colorless contam inations, (ii) the B 880-RC assembly, (iii) the B 8 0 0 -8 5 0 com plex. In contrast with K erfeld et al. (1994a), the fo u rth band was a band of free pigm ents (Bchl or Bchl-t-carotenoids) which had the sam e m olecular mass as the B820 subcom plex o f Chro­ matium purpuratum. For com parison, the B880-RC en riched fraction o f Rhodospirillum rubrum m odified by lyophilization in the presence of octyl-ß-D -glucopyranoside with o r w ithout carotenoids was separated by high perform ance liquid chrom ato g rap h y w ith octyl-ß-D -glucopyranoside. The apparent m olecular mass of the B820 subcom plex was 30 k D a for the sam ple w ithout caro t­ enoids and 245 kD a for that with carotenoids. The com m on principles of organization o f the B880 com plex, the in teractio n o f the B 8 0 0 -850 com plex with the B880-RC assembly, the participation of caroten o ids in the stabilization of the B880 com plex structure and the ability of different isolation steps to m odify the struc­ ture of the B880 complex are discussed. It was concluded th a t th ere are o th e r explanations for the presence of carotenoids in the B820 subcom plex. H ence, the q uestion of w hether the B820 subcom plex retains carotenoids rem ains open. 
  Reference    Z. Naturforsch. 51c, 309 (1996) 
  Published    1996 
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 Identifier    ZNC-1996-51c-0309 
 Volume    51 
45Author    A. Makewicz, A. Radunz, G. H. SchmidRequires cookie*
 Title    Comparative Immunological Detection of Lipids and Carotenoids on Peptides of Photosystem I from Higher Plants and Cyanobacteria Photosystem I, Western Blot, Lipid-and Pigment Composition, Lipid-Carotenoid Binding  
 Abstract    Photosystem I preparations were obtained from wild-type tobacco Nicotiana tabacum var. JWB, three chlorophyll-deficient tobacco mutants: Su/su, Su/su var. Aurea and yellow-green leaf patches of the variegated mutant NC 95, Spinacia oleracea and furthermore from the mesophilic cyanobacterium Synechococcus PCC 7942 and the thermophilic cyanobacterium Synechococcus sp.. Peptides from these preparations were analyzed by SDS polyacrylamide gel electrophoresis and transferred for detection of bound lipids and carotenoids according to the Western blot procedure to nitrocellulose membranes. The PS I preparations from the Nicotiana tabacum species and spinach consist of the core complex and the LHCP I complex, the latter containing, however, traces of the LHCP II polypeptides. The core com plex consists of the two core peptides with the apparent molecular mass o f 66 kDa each and peptides with molecular masses of 22, 20, 19, 17, 16, 10 and 9 kDa. The LHCP I complex contains 4 subunits with molecular masses of 28, 26, 25 and 24 kDa. The PS I preparations of the two mutants Su/su and Su/su var. Aurea contain as impurities traces o f the core peptides (D)/D 2) and the two chlorophyll-binding peptides (CP43/CP47) of photosystem II. The PS I preparation from the mesophilic and thermophilic cyanobacterium consists of the two core peptides with the apparent molecular mass of 66 kDa and peptides with molecular masses of 16, 14 and 10 kDa. The peptides of the PS I preparations were characterized by specific PS I, CP I and LHCP I antisera. The antiserum to the PS I complex reacts in the Western blot with the hom ologous peptides of PS I from higher plants, but only with the CP I complex from the two cyanobacteria. In comparative studies with PS II from higher plants the PS I antiserum reacts with the LHCP II complex as expected. The antiserum to the CP I com plex reacts only with the 66 kDa peptides of PS I from all objects. There is no cross reaction with the 66 kDa peptides (heterodimer of the D |/D 2 peptides) of PS II. The antiserum to the LHCP I com plex reacts only with the four LHCP I peptides of PS I from higher plants and as expected with the LHCP II of PS II: Because cyanobacteria do not have LHCP complexes, there is no reaction with the LHCP I antiserum. By means of polyclonal m onospecific anti­ sera to lipids it was shown by Western blot procedure that only two lipid species are bound to PS I peptides. The galactolipid monogalactosyldiglyceride is bound to the CP I complex o f the Nicotiana tabacum species, spinach and the two cyanobacteria as well as to the LHCP I com plex of the higher plants. The phospholipid phosphatidylglycerol is only associated with the CP I complex of the analyzed higher plants and cyanobacteria. With polyclonal m onos­ pecific antisera to carotenoids it was demonstrated that ß-carotene, lutein, neoxanthin and zeaxanthin are associated with the CP I com plex of the higher plants and the cyanobacteria analyzed. Violaxanthin is also bound to the CP I complex of the two cyanobacteria, whereas it is bound together with neoxanthin to the LHCP I complex of the higher plants. 
  Reference    Z. Naturforsch. 51c, 319 (1996); received January 22/February 22 1996 D edicated to 
  Published    1996 
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 Identifier    ZNC-1996-51c-0319 
 Volume    51 
46Author    K. Burda, G. H. SchmidRequires cookie*
 Title    On the Determination of the 5-State Distribution in the Kok Model  
 Abstract    We use the Markow chain theory to analyze the oscillation pattern of oxygen evolution during water oxidation in photosystem II under short saturating light flashes. We propose a method based on the standard least square deviation (test x 2) to determine the number of 5-states in the Kok model. As pointed out by Burda et al. (1995) this information is amongst others important for the interpretation of the role of calcium for oxygen evolution. A specific mathematical representation for a situation when the S4 state is longer living than generally assumed is introduced which requires an explicit extension of the Kok model to five states. The higher stability is modelled by introducing additional decay channels, e.g. a nonvanishing probability for the transition of S3 to the 5() state and a further transition probability for the transition from S3 to 5 4. Our analysis is extended to the case of damped oscillations of oxygen evolution caused, for example, by the lack of electron acceptor or the short life time of photosystem II particles. 
  Reference    Z. Naturforsch. 51c, 329—341 (1996); received O ctober 23/D ecem ber 5 1995 
  Published    1996 
  Keywords    0 2-Evolution, o-and ^-Analysis, Transition Probabilities, Cyanobacteria, Tobacco, Chlorella 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0329.pdf 
 Identifier    ZNC-1996-51c-0329 
 Volume    51 
47Author    Beate Nicolausa, Yukiharu Satob, Ko Wakabayashib, Peter BögeraRequires cookie*
 Title    Isomerization of Peroxidizing Thiadiazolidine Herbicides Is Catalyzed by Glutathione S-Transferase  
 Abstract    Thiadiazolidine-converting activity (isom erase), detected in a 4 5 -7 5 % ammonium sulfate precipitate from corn seedlings extracts, was purified by chromatography on hydroxyapatite and by anion exchange on M ono Q Sepharose. Two fractions 1 and 2 with isomerase activity were separated on M ono Q by combination o f a stepwise elution and continuous salt gradi­ ent; fraction 2 eluting at higher salt concentrations was found the most active. Total activity could be enhanced by treatment of seedlings with naphthalic anhydride. Both fractions con­ taining isomerase activity were further purified by glutathione-(G SH) agarose affinity chro­ matography and characterized by their specificity for different thiadiazolidines. Sodium dode-cyl sulfate polyacrylamide gel electrophoresis and gel filtration revealed that the isomerase of fraction 2 consists either of a homodimer or a heterodimer of two proteins with apparent molecular weights o f 28 and 31 kDa, respectively. The protein pattern as well as the strict dependence of activity on thiol groups (GSH or dithiothreitol) suggested a glutathione S-transferase (G ST) catalyzing the thiadiazolidine conversion. Further evidence was obtained by measuring reactions specific for GSTs in both purified fractions, namely the conjugating activity for l-chloro-2,4-dinitrobenzene (C D N B). atrazine and metazachlor. While no atra-zine turnover was found, metazachlor and C DN B conjugation occurred rapidly. Both frac­ tions differed in their activities to several GST substrates with fraction 2 being more effective in metazachlor but less active in C D N B conjugation. Inhibitors specific for GST-catalyzed reactions also inhibited thiadiazolidine conversion confirming that isomerizing activity is at­ tributed to a GST form. We conclude that GST isoforms with different affinities towards thiadiazolidines have been isolated. C D N B activity, molecular weight, the protein pattern on SDS-PAGE as well as the amino acid sequence of one o f its polypeptides suggest that fraction 1, less active in thiadiazolidine isomerization, is identical to GST I. The second peptide of this fraction was resistant to Edman degradation probably due to N-terminal blockage. The properties of the high isomerase activity found in fraction 2 are in agreement with character­ istics of a GST previously termed as isoform II. Chemical names and abbreviations: Atrazine, 2-chloro-4-ethylamino-6-isopropylamino-l,3,5-triazine; Bis-Tris pro­ pane, l,3-bis[tris(hydroxymethyl)methylamino]propane; C DN B. l-chloro-2,4-dinitro-benzene; DTNB, 5,5'-dithio-bis(2-nitrobenzoic acid). Ellman's reagent; DTT, dithiothreitol; GSH. reduced glutathione; GST, glutathione S-trans-ferase; indomethacin. l-(/?-chlorobenzoyl)-5-methoxy-2-methyl-3-indolylacetic acid; metazachlor, 2-chloro-/V-(2,6-di-m ethylphenyl)-/V -(l//-pyrazol-l-ylm ethyl)acetam ide; NA. naphthalic anhydride, (naphthalene-1,8-dicarboxylic acid anhydride): NEM , /V-ethylmaleimide; proto, protoporphyrin IX; protox. protoporphyrinogen-IX oxidase; SB. sulfo-bromophthalein: SDS-PAGE, sodium dodecyl sulfate polyacrylamide gel electrophoresis; thiadiazolidines, 5-arvlim-ino-3.4-tetramethylene-1.3,4-thiadiazolidin-2-ones: thiadiazolidine n o .l. 5-(4-bromophenylimino)-3.4.-tetramethy-lene-1.3.4-thiadiazolidin-2-one; thiadiazoldidine no. 4. 5-[4-(4-chlorobenzyloxy)phenylim ino]-3.4-tetramethylene-1,3.4-thiadiazolidine-2-thione; triazolidines, 4-aryl-l,2 tetramethvlene-l,2,4-triazolidin-3-one-5-thiones; triazolidine-3,5-dithiones, 4-aryl-1.2-tetramethylene-l,2,4-triazolidine-3.5-dithiones; (see Table III for formof all thiadiazolidines and triazolidines); tridiphane, 2-(3,5-dichlorophenyl)-2-(2,2,2-trichloroethyl)oxirane; Tris, tris(hvdroxymethyl)-aminomethane. Reprint requests to Prof. Böger. Fax: 07531 883 042. 0939-5075/96/0500-0342 $ 06.00 © 1996 Verlag der Zeitschrift für Naturforschung. All rights reserved. D B. Nicolaus et al. ■ Isomerase Activity of Glutathione S-Transferase 343 
  Reference    Z. Naturforsch. 51c, 342 (1996) 
  Published    1996 
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 Identifier    ZNC-1996-51c-0342 
 Volume    51 
48Author    Peter Streb, Ann Herm, Jürgen Schaub, FeierabendRequires cookie*
 Title    Latent Oxidative Stress Responses of Ozone-Fumigated Cucumber Plants Are Enhanced by Simultaneous Cold Exposures  
 Abstract    Cucumber plants (Cucumis sativus L.) were grown under controlled conditions and fumi­ gated with either 0 3, diluted autom obile exhaust or a combination of both. The ratio of variable to maximum chlorophyll fluorescence (FJFm) was estimated as a measure of PSII activity Activities of the enzymes catalase, glutathione reductase and guaiacol-dependent peroxidase and contents o f the antioxidants ascorbate and glutathione were assayed as poten­ tial indicators of oxidative stress. The behavior of catalase and of PSII are of particular diagnostic interest because they require continuous repair in light. Exposures of up to 13 days to moderate concentrations of the pollutant gases alone did not induce striking changes in any of the activities that were assayed. A lso when the plants were subjected to an addi­ tional stress treatment by exposing them to 4 short cold treatments (2h each at 0 -4 °C in light on days 12-15 after sowing) which induced marked declines o f the FJFm ratio, the chlorophyll content and the catalase activity, these cold-induced symptoms of photodamage were not significantly enhanced by the fumigation treatments. However, increases of the activities of glutathione reductase and peroxidase observed during a period of recovery following the cold-exposures were markedly higher in 0 3-fumigated plants, as compared to plants grown in filtered air or fumigated with car exhaust alone. The results emphasize that effects of moderate pollutant exposures may be latent or delayed over long time periods and that defence responses can be enhanced when plants are exposed to additional, naturally occurring stress situations. 
  Reference    Z. Naturforsch. 51c, 355 (1996); received January 26/February 23 1996 
  Published    1996 
  Keywords    Cucumis sativus (Cucumber), Autom obile Exhaust, Latent Injury, Oxidative Stress, Ozone 
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 Identifier    ZNC-1996-51c-0355 
 Volume    51 
49Author    N. G. Faleev3, S. N. Spirina3, V. S. Ivoilov3, T. V. Dem, R. S. Phillips0Requires cookie*
 Title    The Catalytic Mechanism of Tyrosine Phenol-Lyase from Erwinia herbicola: The Effect of Substrate Structure on pH-Dependence of Kinetic Parameters in the Reactions with Ring-Substituted Tyrosines  
 Abstract    Apparently hom ogeneous tyrosine phenol-lyase (TPL) from Erwinia herbicola has been prepared by a new method. The pH -dependencies o f the main kinetic parameters for the reactions of Erwinia TPL with tyrosine, 2-fluorotyrosine, 3-fluorotyrosine, 2-chlorotyrosine, and 3.4-dihydroxyphenylalanine (D O P A) have been studied. The pattern of pH-dependence ° f V^max depends on the nature of the substituent in the aromatic ring. For the substrates bearing small substituents (H, 2-F, 3-F) Kmax values were found to be pH-independent. For 2-chlorotyrosine and DO PA Vmax decreased at lower pH, the effect being described by equa­ tion with one pKa. Generally two bases are reflected in the pH dependence of Vmax/K m. The first base, probably is responsible for the abstraction of a-proton, while the second one, interacts with the phenolic hydroxyl at the stage of binding. The reaction of TPL with DOPA differs from the reactions with other tyrosines by the requirement of an additional base which is reflected in the pH-profiles of both and VmaJ K m. For the reaction of TPL from Citrobacter intermedins with DO PA only Vma J K m values could be determined. The activity of Citrobacter enzyme towards DO PA is considerably less than that of E. herbicola enzyme, and its maximal value is attained at higher pH. 
  Reference    Z. Naturforsch. 51c, 363 (1996); received N ovem ber 22 1995/February 27 1996 
  Published    1996 
  Keywords    Tyrosine Phenol-Lyase, Mechanism, Kinetics, Substrate Structure, pH -Dependence 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0363.pdf 
 Identifier    ZNC-1996-51c-0363 
 Volume    51 
50Author    Akihiro Tai3, Kazuyoshi Kawazub, Akio Kobayashi3Requires cookie*
 Title    Species-Specificity of an Elicitor-Active Oligosaccharide, LN-3, to Leguminous Plants  
 Abstract    a D ep artm en t of B iotechnology, Faculty o f E ngineering, O saka U niversity, O saka 565, Japan b D ep artm en t of A gricultural Science, O kayam a U niversity, O kayam a 700, Japan Z. N aturforsch. 51c, 37 1 -3 7 8 (1996): received January 12/February 13, 1996 E licitor, Species-Specificity, Phytoalexin A ccum ulation, B ean, Pea LN-3, a linear pyridylam inated hepta-ß-glucoside previously found to show elicitor activity in alfalfa cotyledons, was exam ined for phytoalexin-inducing activity in p ea epicotyl and bean cotyledon assays. LN-3 did not show (+)-pisatin-inducing activity in pea epicotyls. In the bean cotyledon assay, how ever, the (±)-k ie v ito n e co n ten t gradually increased w ith increasing LN-3 concentration, and reached a m axim um (ca. 17 |ig/g fresh wt) at 100 j.ig/ml. H alf-m axim al elicitor activity was seen at ca. 16 j .im . A fter th ree legum es, alfalfa, pea and b ean, were trea ted with LN-3, the recovery of the rem aining LN-3 o r its fragm ents was exam ined. A lm ost 100% of LN-3 or its fragm ents was recovered from the pea test solution; in con trast, recoveries from alfalfa and bean were only 63.8 and 38.1% , respectively. H P L C an d LC-MS analyses of the recovered sam ples indicated th at LN-3 was hydrolyzed to give m ono-and/or digluco-side(s) in the alfalfa and the bean solutions, while LN-3 was hydrolyzed to give sugar fragm ents with 
  Reference    Z. Naturforsch. 51c, 371 (1996) 
  Published    1996 
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 Identifier    ZNC-1996-51c-0371 
 Volume    51 
51Author    Agostina Congiu, Castellano"., Mario Barterib, Antonio Bianconi3, Fabio Bruni3, StefanoDella Longac, Corrado Paolinelli3Requires cookie*
 Title    Conformational Changes Involved in the Switch from Ovalbumin to S-Ovalbumin  
 Abstract    For the first time a comparative study on conformational differences between native oval­ bumin and its heat-stable form, called S-ovalbumin. using small angle x-ray scattering, is reported. To detect a different pathway in the folding mechanism of the two proteins, scatter­ ing m easurements have been performed on ovalbumin and S-ovalbumin denatured with dif­ ferent concentrations o f guanidine hydrochloride, and by heating the proteins at acid pH. The intensity scattering curves provide evidence that the intermediate states in the unfolding process are globular for both proteins while their compactness changes. The reported experi­ mental results suggest that the ovalbumin to S-ovalbumin transformation can be considered a protein-switch triggered by changes in the chemical conditions of the protein environment. Because the conform ational changes are likely to be of functional importance, we infer that the occurrence in vivo o f S-ovalbumin is thus determined by the transformation of oval­ bumin, with a functional role for embryonic development, into a new protein with a dif­ ferent function. 
  Reference    Z. Naturforsch. 51c, 379 (1996); received December 19 1995/February 6 1996 
  Published    1996 
  Keywords    Protein Folding, Conformational Change, Denatured State, Synchrotron Radiation, X-Ray Scattering 
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 Identifier    ZNC-1996-51c-0379 
 Volume    51 
52Author    JürgenA. Rnhold11, OlegM. Panasenkob, Jürgen Schiller1, Klaus Arnold3, YurijA. Vladimirovb, Valeri, I. SergienkobRequires cookie*
 Title    Reaction of Hypochlorous Acid with Hydrogen Peroxide and tert-Butyl Hydroperoxide. *H NMR Spectroscopy and Chemiluminescence Analyses  
 Abstract    In contrast to the well-known reaction o f hypochlorous acid with hydrogen peroxide, no singlet oxygen is formed as the result o f reaction between hypochlorous acid and fm -butyl hydroperoxide. The reaction with hydrogen peroxide yielded a quadratic dependence of light intensity on reactant concentration, a drastic enhancement of luminescence yield using D 20 as solvent and only an em ission of red light, that are typical characteristics of emission result­ ing from two molecules of delta singlet oxygen. Other chemiluminescence properties were observed using tert-butyl hydroperoxide. There was a linear dependence of light intensity on reactant concentration using rm-butyl hydroperoxide in excess with a decline of emission at higher concentrations. 'H-NM R spectroscopic analysis revealed di-rm-butyl peroxide, fm -butanol and also rm-butyl hypochlorite, acetone and acetate as products of the reaction between hypochlorous acid and fm -butyl hydroperoxide. The formation of di-rm-butyl peroxide is only possible assuming a re/Y-butyloxy radical as primary intermediate product of this reaction. Our results demonstrate that alkoxy radicals derived from organic hydroperoxides can participate in lipid peroxidation induced by hypochlorous acid. On the other hand, singlet oxygen did not influence the yield of peroxidation products. Changing H 20 for D 20 in suspension of egg yolk phosphaditylcholine no differences in accumulation of thiobarbituric acid reactive products were observed. 
  Reference    Z. Naturforsch. 51c, 386—3 (1996); received January 26/February 27. 1996 
  Published    1996 
  Keywords    Hypochlorous Acid Hydrogen Peroxide, tert-Butyl Hydroperoxide, Singlet Oxygen Free Radicals, 'H NM R Spectroscopy, Chemiluminescence 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0386.pdf 
 Identifier    ZNC-1996-51c-0386 
 Volume    51 
53Author    E. H. Schlüssel, E. F. ElstnerRequires cookie*
 Title    Desialylation of Low Density Lipoprotein -Metabolic Function versus Oxidative Damage?  
 Abstract    Low Density Lipoprotein (LDL), N-acetyl-neuraminic-acid, Copper, Oxidation Low density lipoproteins are generally considered to play a major role in the developm ent of atherosclerotic vascular diseases. There is growing interest in LDL subspecies, especially in their density, carbohydrate content and oxidizability, which is supposed to enhance athero-genicity. We investigated the influence of desialylation on the resistance of the lipoprotein particles towards Cu(II) prooxidative activity. 
  Reference    Z. Naturforsch. 51c, 395—400 (1996); received February 7/February 27 1996 
  Published    1996 
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 Identifier    ZNC-1996-51c-0395 
 Volume    51 
54Author    M. Masoom-YasinzaiRequires cookie*
 Title    Altered Fatty Acid, Cholesterol and Na+/K+ ATPase Activity in Erythrocyte Membrane of Rheumatoid Arthritis Patients  
 Abstract    Rheum atoid Arthritis, Cholesterol, Eicosapentaenoic Acid. N a+/K +ATPase, Erythrocyte Membrane Rheum atoid arthritis (R A) is a chronic inflamatory disease whose cause remains obscure. B lood from 15 R A patients and controls was taken and their ghosts separated. The ghosts were analysed for cholesterol content, N a+/K+ ATPase activity and eicosapentaenoic acid. The cholesterol content in the ghosts o f RA patients was significantly lower as compared with the set of controls. There was a major difference in the activity of N a+/K + ATPase betw een the two groups with RA patients showing significantly elevatad activity. The ghosts of the R A patients exhibited major abnormality in the polyunsaturated fatty acids of phos­ pholipids with the level of eicosapentaenoic acid (<x>-3, 20:5) being significantly reduced. 
  Reference    Z. Naturforsch. 51c, 401 (1996); received September 4 1995/January 16 1996 
  Published    1996 
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 Identifier    ZNC-1996-51c-0401 
 Volume    51 
55Author    M. Molwitz3, S. S. Silvab, J. D. Ribeiro, I.C R Oberto, M.G A Felipe, A.M R Pratab, I. M. MancilhabRequires cookie*
 Title    Aspects of the Cell Growth of Candida guilliermondii in Sugar Cane Bagasse Hydrolysate  
 Abstract    In this work the behavior of the growth of Candida guillierm ondii FTI 20037 in sugar cane bagasse hemicellulosic hydrolysate on various oxygen transfer rates was investigated. The yeast was able to grow and produced xylitol at different performence levels. At 1.0 vvm (volume of air per volum e of medium per minute) the highest growth with 24.4 g/1 was observed, but no xylitol was produced. At aeration rate of 0.5 vvm the growth was lower, but therefore slight amounts of xylitol (xylitol yield factor -y p/s = 0.15 g/g) were observed. The lowest cell concentration (10.7 g/1) and the highest xylitol yield (Y p/s = 0.46 g/g) was observed when aeration was changed from 0.5 vvm to 0.05 vvm after 14 h. 
  Reference    Z. Naturforsch. 51c, 404 (1996); received October 3 0 /December 20. 1995 
  Published    1996 
  Keywords    Candida guillierm ondii, Oxygen, Sugar Cane Bagasse, Xylose, Xylitol Fermentation 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0404.pdf 
 Identifier    ZNC-1996-51c-0404 
 Volume    51 
56Author    A. Braham Hefetz3, Timo Taghizadehr, Wittko FranckeRequires cookie*
 Title    The Exocrinology of the Queen Bumble Bee Bombus terrestris (Hymenoptera: Apidae, Bombini)  
 Abstract    Chemical analyses are presented of prominent exocrine glands of queen B om bus terrestris including mandibular, labial and hypopharyngeal glands in the head, Dufour's gland and tarsal glands. A plethora o f about 500 substances were identified belonging to various ali­ phatic compounds including hydrocarbons, various classes of esters, alcohols, methyl ketones and fatty acids. A group of chiral hydroxy acids and their butanoic acid esters are reported for the first time in bees. 
  Reference    Z. Naturforsch. 51c, 409 (1996); received January 17/March 1 1996 
  Published    1996 
  Keywords    Bumble Bee, Queen, Glands, Volatile Secretions, Identification 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0409.pdf 
 Identifier    ZNC-1996-51c-0409 
 Volume    51 
57Author    Fco Javier, A. Rriaga, AngelR. Um Berob, EckhardW. OllenwebercRequires cookie*
 Title    Two New Triterpenes from the Frond Exudate of the Fern Notholaena rigida  
 Abstract    From the farinose frond exudate of the fern N otho­ laena rigida two new triterpenes have been identified. They were found to be the C-24 epimers of 24, 25-diO-isopropylidene-3ß, 12ß, 20(S)-trihydroxy-dammarane. 
  Reference    Z. Naturforsch. 51c, 423 (1996); received February 8/ March 11 1996 
  Published    1996 
  Keywords    Notholaena rigida, Pteridaceae, Farinose Frond Exudate, Novel Triterpenes, Dammarane Derivatives 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0423_n.pdf 
 Identifier    ZNC-1996-51c-0423_n 
 Volume    51 
58Author    P. V. Monje3, E.J B AranbRequires cookie*
 Title    On the Formation of Weddellite in Chamaecereus silvestrii, a Cactaceae Species from Northern Argentina  
  Reference    Z. Naturforsch. 51c, 426 (1996) 
  Published    1996 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0426_n.pdf 
 Identifier    ZNC-1996-51c-0426_n 
 Volume    51 
59Author    M. O. Ilori, O. O. Amund, O. OmidijiRequires cookie*
 Title    Characterisation of a Neutral Protease Produced by Micrococcus luteus  
 Abstract    A proteolytic enzyme produced by a cassava-ferment­ ing strain of Micrococcus luteus was extracted and puri­ fied 50-fold by gel filtration and ion exchange chroma­ tography. The optimum pH for the enzyme was 7.0, the opti­ mum temperature 25 °C, the apparent molecular weight 42 kDa and the K m value, 0.45 mg m l-1 with casein as substrate. The enzyme was stimulated by Ca2+ and Mg2+ but inhibited by Zn2+ and Co2+ ions. Other inhibitors were EDTA, KCN, citric acid and L-cysteine indicating the enzyme to be a metalloprotease. 
  Reference    Z. Naturforsch. 51c, 429—431 (1996); received May 26 1995/January 15 1996 
  Published    1996 
  Keywords    M etalloprotease Purification, Heat Inactivation, Apparent Molecular Weight, Inhibitors 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0429_n.pdf 
 Identifier    ZNC-1996-51c-0429_n 
 Volume    51 
60Author    F. O. Jeda3, I. Skardovac, M.I G Uarda3, C. M. Aldonado3, H. FolchbRequires cookie*
 Title    Radiation-Induced Apoptosis in Thymocytes: pH Sensitization  
 Abstract    Apoptosis. pH. Thymocytes, Irradiation Thymocytes were used as a model system to study the effect of microenvironmental pH changes on the radia-tion-induced apoptosis. We found that the sensitivity of thymocytes toward radiation induced apoptosis is increased by increasing the pH of the incubation m e­ dium. The major sensitivity change occurs between pH 7 and 8. In a given cell suspension the results obtained where similar when the apoptosis evaluation was carried out either by counting the picnotic nuclei, or monitoring the fraction of apoptotic nuclei by flow cytometry; both methods show a radiosensitization when the pH value of incubation media rises from 7 to 8. These results may be important when "in vitro " experiments are performed with lymphoid cells, since changes in pH of the media may determine important changes in the results. 
  Reference    Z. Naturforsch. 51c, 432 (1996); received November 2. 1995/February 14 1996 
  Published    1996 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0432_n.pdf 
 Identifier    ZNC-1996-51c-0432_n 
 Volume    51 
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