Go toArchive
Browse byFacets
Bookbag ( 0 )
Facet   section ZfN Section C:Volume 046  [X]
Results  171 Items
Sorted by   
Publication Year
1991 (171)
21Author    Peter Dancker, Lore HessRequires cookie*
 Title    Product Release is Not the Rate-Limiting Step during Cytochalasin B-Induced ATPase Activity of Monomeric Actin  
 Abstract    H ochschule D arm stad t, S chn ittsp ah n straß e 10, D -6100 D arm stad t, B undesrepublik D eutschland and Karl Ritter M ax-P lanck-Institut für m edizinische F o rsch u n g , D-6900 H eidelberg, B undesrepublik D eutschland Z. N aturforsch. 46c, 139— 144 (1991); received N ovem ber 12, 1990 A ctin, A T Pase A ctivity, N ucleo tid e Exchange U n d er conditions w here cytochalasin B induces A T Pase activity o f m onom eric actin (0.3 m M M gC l,, 1 m M E G T A , 30 (iM cytochalasin B, 1 m M A TP) the rate c o n stan t o f the ex­ change o f actin-boun d e-A T P for free A T P is a b o u t 4 -6 times faster th an steady state A T P ase activity. W hen a stoichiom etric A T P -actin com plex is extracted with PCA (single tu rn o v er ex­ perim ent) the ap p are n t rate c o n sta n t o f Pj generation is n o t faster than steady state A T Pase activity. -The experim ents suggest th a t the hydrolysis o f actin-bound A TP an d not the subse­ quent release o f hydrolysis p ro d u c ts is rate-lim iting during cytochalasin-induced A T Pase activi­ ty o f actin. 
  Reference    Z. Naturforsch. 46c, 139 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0139.pdf 
 Identifier    ZNC-1991-46c-0139 
 Volume    46 
22Author    M. Artina Dorsch, Klaus SchellerRequires cookie*
 Title    Incorporation of a Calliphora Arylphorin Gene into the Germ Line of Drosophila by P-Element-Mediated Transformation  
 Abstract    iv ersität W ü rzb u rg , R ö n tg en rin g 10, D -8700 W ürzburg, B undesrepublik D eutschland Z. N aturforsch. 46c, 1 4 5 -148 (1991); received A ugust 20, 1990 A rylphorin, P-Elem ent T ran sfo rm atio n , Calliphora, D rosophila rosy506 T w o arylphorin gene clones were inserted into the tran sp o sab le p-elem ent vector Carnegie 20 and injected in to Drosophila rosy~ m u tan ts. T ra n sp o n e d anim als were selected by their red eye colour and rem ated. W e d em o n stra te by h y b rid izatio n experim ents the stable in­ tegration o f the injected genes in the germ line o f Drosophila. H ow ever, the in co rp o rated genes are n o t expressed. 
  Reference    Z. Naturforsch. 46c, 145 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0145.pdf 
 Identifier    ZNC-1991-46c-0145 
 Volume    46 
23Author    Gerd GädeRequires cookie*
 Title    Glycogen Phosphorylase in the Fat Body of Two Cockroach Species, Periplaneta americana and Nauphoeta cinerea: Isolation, Partial Characterization of Three Forms and Activation by Hypertrehalosaemic Hormones  
  Reference    Z. Naturforsch. 46c, 149 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0149.pdf 
 Identifier    ZNC-1991-46c-0149 
 Volume    46 
24Author    Rainer Hennecke, Gerd Gellissen, Klaus-Dieter SpindlerRequires cookie*
 Title    Haemocyanin Synthesis in the Crayfish, Astacus leptodactylus: in vitro Production by the Midgut Gland after Addition of Oxygen Binding Modulators and Exogenous Copper  
 Abstract    In stitu t für Z oologie, L ehrstuhl für H orm on-und E ntw icklungsphysiologie, H einrich-H eine-U niversität D üsseldorf, D-4000 D üsseldorf 1, and * R hein Biotech, E rk ra th e r S traß e 230, D-4000 D üsseldorf, B undesrepublik D eutschland Z. N atu rfo rsch . 46c, 163— 165 (1991); received O ctober 5, 1990 H aem ocyanin Synthesis, C o p p er, O xygen Binding M odulators, C rayfish H aem ocyanin synthesis in the m idgut gland o f the crayfish, A stacus leptodactylus, was stu d ­ ied in vitro. T he additio n o f exogenous co p p er into the culture m edium reduces the synthesis o f total proteins and o f h aem ocyanin. L-lactate, uric acid and dopam ine, which m odify the affini­ ty o f haem ocyanin to w ard s oxygen, do n o t influence the biosynthesis o f the polypeptide. 
  Reference    Z. Naturforsch. 46c, 163 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0163.pdf 
 Identifier    ZNC-1991-46c-0163 
 Volume    46 
25Author    Requires cookie*
 Title     
 Abstract    V f V y y s— s s— s s— s S— s s— s 1 2 3 4 5 Fig. 1. S tructures o f dim ethyl-1,2-dithiolanes rep o rted in the anal sac secretions in m ustelids. 
  Reference    Z. Naturforsch. 46c, 166 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0166_n.pdf 
 Identifier    ZNC-1991-46c-0166_n 
 Volume    46 
26Author    Requires cookie*
 Title    Lepistirones, Major Volatile Metabolites from Liquid Cultures of Lepista irina (Basidiomycotina)  
 Abstract    W olf-Rainer A braham G esellschaft für B iotechnologische F o rsch u n g m bH -G B F , M ascheroder W eg 1, D-3300 B raunschw eig, B undesrepublik D eutschland Hans-Peter Hanssen and Irene Urbasch IM B -Industrielle M ikrobiologie & B iotechnologie G m b H , L u ru p 4, D-2070 G ro ß h a n sd o rf, B undesrepublik D eutschland Z. N aturforsch. 46c, 169-171 (1991); received N ovem ber 30, 1990 Lepista irina, Basidiom ycetes, L epistirones, F u n g al Sesquiterpenes, Bisabolane D erivatives T he basidiom ycete Lepista irina (F r.) Bigelow (strains CBS 366.47 and CBS 458.79) was cul­ tivated on a biom alt (2%)-liquid m edium fo r 28 days. The steam distillate was analyzed by G L C and G L C -M S . T he stru ctu re elu cid atio n o f the p red o m in an t constitu en t resulted from spectroscopic m ethods, p articu larly from its l3C N M R spectrum , nuclear O verhauser en­ hancem ent 'H N M R d a ta , and from 2 d 'H h o m o n u clear shift co rrelation. The bisabolane de­ rivative was nam ed lepistirone an d is described for the first tim e as a n atu ral p ro d u ct. Two m in o r related co m p o u n d s could be ch aracterized by their MS d ata. 
  Reference    Z. Naturforsch. 46c, 169 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0169.pdf 
 Identifier    ZNC-1991-46c-0169 
 Volume    46 
27Author    Hirobum, Yam Amoto, Sumiko Kawai, Junko Mayumi, Toshiyuki Tanaka, M. Unekazu Iinuma, MizuoM. IzunoRequires cookie*
 Title    Prenylated Flavanone Production in Callus Cultures of Sophoraßavescens var. angustifolia  
  Reference    Z. Naturforsch. 46c, 172 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0172.pdf 
 Identifier    ZNC-1991-46c-0172 
 Volume    46 
28Author    Hans-W Rauwald, Deo-D Niyonzima, E. R., H. Om, B. Anthrones, Chromones StereochemistryRequires cookie*
 Title    Neue Untersuchung über Inhaltsstoffe aus Aloe-und Rhamnus-Arten, XV [1] Homonataloin A und B aus Aloe lateritia: Reindarstellung, Konstitutions-und Konfigurationsaufklärung der Diastereomeren* A New Investigation on Constituents of Aloe and Rhamnus Species, XV [1] Hom onataloins A and B from Aloe lateritia: Isolation, Structure and Configurational Determ ination of the Diastereomers  
 Abstract    From the leaf exudate o f Aloe lateritia ENG LER the C-glucosyl com pounds hom onataloin, aloeresin A and aloesin (synon. aloeresin B) were isolated together with the anthraquinone nataloeem odin-8-methylether and spectroscopically identified. H om onataloin, widely dis­ tributed in Aloe species, was separated into hom onataloin A and B by combined TLC and DCCC. In their 1 D and 2 D 'H N M R spectra only the shifts o f the 2'-hydroxyl protons o f both glucosyl residues differ significantly, indicative o f 1 05 (A) resp. 10/? (B) configurations. In both com pounds the anthrone is in ß-position o f the D-glucopyranosyl, as determined by the large coupling constants o f the anomeric protons. The 13C N M R signals are unambiguously assigned by the use o f DEPT, APT and gated-decoupling methods. Only the chemical shifts o f C -ll and C-14 show significant differences between both diastereomers due to the adjacent 2'-sugar hydroxyls. The two hom onataloins differ mostly in optical rotation and circulardi-chroism due to different configurations at C -l0 o f the anthrone part. The absolute configura­ tions o f the diastereomers are determined by correlation o f their CD spectra with the C D spec­ tra o f the structural analogues 7-hydroxyaloins A and B, which shows that hom onataloin A is the 105, 1'5-compound and that homonataloin B has 10/?, 1'5-configuration. 
  Reference    Z. Naturforsch. 46c, 177—182 (1991); received October 2 1990 Aloe lateritia 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0177.pdf 
 Identifier    ZNC-1991-46c-0177 
 Volume    46 
29Author    Jörg Spörle, Hans Becker, NorisSalazar Allen, M. Ahabir, P. G. UptaRequires cookie*
 Title    Occurrence of (-)-G eosm in and Other Terpenoids in an Axenic Culture of the Liverwort Symphyogyna brongniartii  
 Abstract    Symphyogyna brongniartii, Hepaticae, in vitro Culture, G eosm in, Terpenoid Production An axenic culture o f Sym phyogyna brongniartii has been initiated from spores on modified Benecke medium. Growth was best on Gam borg B5 medium with 0.3% sucrose, with a doubling time o f 36 days. The culture produced the same terpenoids as plants growing in their natural habitat, perrottetianal A being the major constituent. Also found were bicyclo-germacrene, ß-barbatene, 8-selinene, ß-cubebene, spathulenol, and (-)-g eo sm in . The latter compound was hitherto only known from microorganisms. Synthesis rate o f terpenoids during the passage period and quantitative differences in terpenoid production on different mineral media were investigated. 
  Reference    Z. Naturforsch. 46c, 183—188 (1991); received December 28 1990 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0183.pdf 
 Identifier    ZNC-1991-46c-0183 
 Volume    46 
30Author    KenjiM. Onde, Mitsuo Takasugi, JennyA. Lewis, G.Roger FenwickRequires cookie*
 Title    Time-Course Studies of Phytoalexins and Glucosinolates in UV-Irradiated Turnip Tissue  
 Abstract    Sliced turnip root (Brassica campestris L. ssp rapa) was irradiated for a total o f 20 min with a 15 W germicidal lamp and the tissue incubated at 25 °C. The effects o f such treatment on indole phytoalexins (methoxybrassinin (I); brassinin (II); cyclobrassinin (III); spirobrassinin (IV) and glucosinolates were determined using high performance liquid chromatography procedures. Accumulation o f phytoalexins I-I I I was evident within 8 h o f irradiation, whilst form ation o f spirobrassinin was evident only after 24 h. M aximal levels o f III and IV (> 100 |ig g " 1 freeze dried tissue) were greater than those o f I and II (27 and 17 jag g ~ \ respec­ tively). The individual glucosinolate levels were affected in a complex manner; whilst most glu-coinolates decreased on storage, the levels o f indole glucosinolates, glucobrassicin (XI) and 1-methoxyglucobrassicin (XIII), increased until 5 to 6 days after irradiation and thereafter declined. Whilst structural features o f I-IV , XI and XIII suggest close biosynthetic relation­ ships between these classes o f biologically-active indoles, further studies are needed to estab­ lish this point unambiguously. 
  Reference    Z. Naturforsch. 46c, 189—193 (1991); received October 11 1990/February 4 1991 
  Published    1991 
  Keywords    G lucosinolate, Phytoalexin, Turnip, UV Irradiation 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0189.pdf 
 Identifier    ZNC-1991-46c-0189 
 Volume    46 
31Author    K. Taraz, E. M. Schaffner, H. Budzikiewicz, H. K. Orth, G. PulvererRequires cookie*
 Title    Die Bildung hydroxylierter Phenazine durch Pseudomonas fluorescens Y4 bei Be2+-Zusatz zum Kulturmedium -ein Abwehrmechanismus? [ 1 ] The Form ation of Hydroxylated Phenazines by Pseudomonas fluorescens Y4 upon Addition of Be2 to the Culture Medium -a Defense Mechanism?  
 Abstract    Pseudomonas fluorescens Y4 grown in an iron deficient medium produces increased am ounts o f 2,9-di-and 2,3,9-trihydroxyphenazine-l-carboxylic acid when Be2+ is added to the culture. The significance o f the formation o f these com pounds is discussed. 
  Reference    Z. Naturforsch. 46c, 194—196 (1991); received July 9 1990/February 1 1991 
  Published    1991 
  Keywords    Pseudomonas fluorescens, Phenazines, Be2+ Stress 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0194.pdf 
 Identifier    ZNC-1991-46c-0194 
 Volume    46 
32Author    D. Schulz, A. Passeri, M. Schmidt, S. Lang, F. W. Agner, V. Wray, W. GunkelRequires cookie*
 Title    Marine Biosurfactants, I. Screening for Biosurfactants among Crude Oil Degrading Marine Microorganisms from the North Sea  
 Abstract    Three bacterial strains o f marine origin were isolated during a screening for biosurfactants among w-alkane degrading microorganisms. One strain -identified as Alcaligenes sp. MM 1 -produced a novel glucose lipid. In the case o f A rthrobacter sp. EK 1 the well-known trehalose tetraester was found as major com ponent. From another pure culture classified as Arthrobac­ ter sp. SI 1, extracellular emulsifying agents with properties indicating high molecular weight substances were detected. Furthermore trehalose corynom ycolates were found at up to 2 g/1. The isolated biosurfactants showed good interfacial and emulsifying properties. 
  Reference    Z. Naturforsch. 46c, 197 (1991); received October 9 1990 
  Published    1991 
  Keywords    Oil Pollution, Marine M icroorganisms, Biosurfactants, Glycolipids, Emulsifier 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0197.pdf 
 Identifier    ZNC-1991-46c-0197 
 Volume    46 
33Author    A. Passed, S. Lang, F. Wagner, Victor WrayRequires cookie*
 Title    Marine Biosurfactants, II. Production and Characterization of an Anionic Trehalose Tetraester from the Marine Bacterium Arthrobacter sp. EK  
 Abstract    Marine Microorganism, Hydrocarbons, Biosurfactants. Trehalose Tetraester, Structure Eluci­ dation Within a screening for biosurfactants we could isolate various «-alkanes utilizing marine bacteria which were capable o f synthesizing glycolipids. One strain was identified as Arthro­ bacter sp. EK 1 which produced trehalose lipids. After purification by column and thick layer chromatography the main fraction, an anionic 2,3,4,2'-trehalose tetraester, was obtained. The chain lengths o f fatty acids ranged from 8 up to 14, furthermore succinate could be detected. Since the place o f substitution o f succinate has so far not been cited in literature, a definitive structural elucidation was carried out chemically by hydroboration and by 'H, 2 D 'H , 13C and l3C -'H correlation N M R measurements. All investigations confirmed the exact position o f succinate at C 2 atom o f trehalose. After improvement o f growth conditions the production o f the trehalose tetraester increased up to 4.8 g/1 during a fermentation in a 20 1 bioreactor under nitrogen limitation. 
  Reference    Z. Naturforsch. 46c, 204 (1991); received October 9. 1990 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0204.pdf 
 Identifier    ZNC-1991-46c-0204 
 Volume    46 
34Author    K. Nut, Porem Ba, Wilfried Gunkel, Siegmund Lang, Fritz WagnerRequires cookie*
 Title    Marine Biosurfactants, III. Toxicity Testing with Marine Microorganisms and Comparison with Synthetic Surfactants  
 Abstract    Eight synthetic and nine biogenetic surfactants were tested on their toxicity. Because o f their possible application as oil dispersants against oil slicks on sea. the test organisms used were marine microorganisms (mixed and pure cultures o f bacteria, microalgae, and protozoa). Bac­ terial growth was hardly effected or stimulated, whilst that o f algae and flagellates was re­ duced. All substances tested were biodegradaded in sea water. The bioluminescence o f Photo-bacter phosphoreum (M icrotox test) was the most sensitive test system used. A ranking shows that most biogenetic surfactants were less toxic than synthetic surfactants. N o toxicity could be detected with the glucose-lipid GL. produced by the marine bacterium Alcaligenes sp. MM 1. 
  Reference    Z. Naturforsch. 46c, 210 (1991); received October 9 1990 
  Published    1991 
  Keywords    Surfactants Biosurfactants, Marine Microorganisms, Toxicity, M icrotox 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0210.pdf 
 Identifier    ZNC-1991-46c-0210 
 Volume    46 
35Author    T. Kentemich, G. Haverkam, H. BotheRequires cookie*
 Title    The Expression of a Third Nitrogenase in the Cyanobacterium Anabaena variabilis  
 Abstract    Physiological experiments indicate that Anabaena variabilis can express either a V-or a Fe-nitrogenase in addition to the conventional, M o-containing enzyme complex. The occur­ rence o f the Fe-nitrogenase in A. variabilis can also be concluded from D N A -D N A hybridiza­ tion experiments using cloned anfW or nifW probes coding for the smaller subunit (= nitroge­ nase reductase) o f the Fe-nitrogenase from Azotobacter vinelandii or for the same subunit o f the M o-nitrogenase from Klebsiella pneumoniae. The cyanobacterium A. variabilis is the first phototroph found to contain all three nitrogenases landii as yet. Vanadium cannot substitute for M o in 
  Reference    Z. Naturforsch. 46c, 217 (1991); received November 2 1990 
  Published    1991 
  Keywords    Alternative N itrogenases, Vanadium-Nitrogenase, Iron-Nitrogenase, Nitrate Reduction, Cyanobacteria, Anabaena variabilis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0217.pdf 
 Identifier    ZNC-1991-46c-0217 
 Volume    46 
36Author    M. Aria, Luisa Peleatoa, TeresaM. Uiño-Blancob, José Alvaro, Cebrian Pérezb, Manuel José, López-Pérezb Departamento De Bioquimica, BiologiaM. Olecular, CelularRequires cookie*
 Title    Significance of the Non-Oxidative Pentose Phosphate Pathway in Aspergillus oryzae Grown on Different Carbon Sources  
 Abstract    Specific enzyme activities o f the non-oxidative pentose phosphate pathway in Aspergillus oryzae mycelia grown on different carbon sources were determined. Mycelia grown on glu­ cose, mannitol and ribose show the highest specific activities, ribose 5-phosphate isomerase being specially very enhanced. M oreover, transketolase, transaldolase, ribose 5-phosphate iso­ merase and ribulose 5-phosphate 3-epimerase were determined in different developmental stages o f mycelia grown on glucose, mannitol and ribose. The non-oxidative pentose phos­ phate pathway is more active during conidiogenesis, except for ribulose 5-phosphate 3-epimerase, suggesting a fundamental role o f this pathway during that stage to supply pen­ toses for nucleic acids biosynthesis. A general decrease o f the enzyme activities was found in sporulated mycelia. Arabinose 5-phosphate was tested as metabolite o f the pentose pathway. This pentose phosphate was not converted into hexose phosphates or triose phosphates and inhibits significantly the ribose 5-phosphate utilization, being therefore unappropriate to sup­ port the Aspergillus oryzae growth. 
  Reference    Z. Naturforsch. 46c, 223 (1991); received September 27 1990/January 25 1991 
  Published    1991 
  Keywords    Aspergillus, Pentose Phosphate Pathway, Fungal Development 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0223.pdf 
 Identifier    ZNC-1991-46c-0223 
 Volume    46 
37Author    PeterH. Ildebrandt, Kai Griebenow, AlfredR. Holzwarth, K. Urt SchaffnerRequires cookie*
 Title    Resonance Raman Spectroscopic Evidence for the Identity of the Bacteriochlorophyll c Organization in Protein-Free and Protein-Containing Chlorosomes from Chloroflexus auvantiacus  
 Abstract    Protein-free and protein-containing chlorosom es from Chloroflexus aurantiacus, strain 0 k -7 0 fl, were studied by resonance Raman (R R) spectroscopy. Both preparations gave the same spectra o f the bacteriochlorophyll c (BChl c) chrom ophores in the range o f 1 2 0 0 -1750 cm "1. This strongly corroborates previous evidence [Griebenow et al., Z. Naturforsch. 45c, 8 2 3 -8 2 8 (1990), and references therein] that the three-dimensional structure o f the antenna complexes is not determined by direct interaction with protein but rather is due to BChl c self­ organization. The analysis o f the coordination-sensitive marker bands o f the chlorin m acro­ cycle reveals a mixed six-and fivefold ligation o f the M g ion. Based on two C = 0 stretching vibrations originating from a free and a M g-bound C-9 keto group, it is concluded that only in the six-coordinated state the keto group serves as an axial ligand to the M g ion o f a neighbour­ ing chlorin. The second permanently bound axial ligand is attributed to the C -2a hydroxyl group. 
  Reference    Z. Naturforsch. 46c, 228 (1991); received October 2 1990 
  Published    1991 
  Keywords    Bacteriochlorophyll c, Chlorosom e, Chloroflexus aurantiacus 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0228.pdf 
 Identifier    ZNC-1991-46c-0228 
 Volume    46 
38Author    C. Hristof Klugham, Er, Ulrich SchreiberRequires cookie*
 Title    Analysis of Light-Induced Absorbance Changes in the Near-Infrared Spectral Region I. Characterization of Various Components in Isolated Chloroplasts  
 Abstract    Light-induced absorbance changes in the near-infrared (N IR) spectral region (7 0 0 -9 5 0 nm) are analyzed in isolated spinach chloroplasts using pulsed light-emitting diodes as modulated measuring light sources. With chloroplasts under coupled conditions the light-induced signal is dominated by a relatively slow scattering change displaying a flat difference spectrum. More specific changes can be distinguished by faster induction and relaxation kinetics and in the presence o f valinomycin/nigericin which prevents scattering changes. Besides the dominant P700 change, with a narrow bleaching band around 703 nm and a broad absorbance increase between 750 and 850 nm (peak at 815 nm) the following absorbance changes were identified in the NIR: 1) An absorbance increase caused by plastocyanin (PC) oxidation, with a relatively flat spectrum. 2) An absorbance decrease gaining amplitude towards longer wavelengths, which reflects reduction o f a low potential acceptor o f PS I different from ferredoxin. 3) A field indicating absorbance decrease peaking around 730 nm, the properties o f which correspond to those o f P 515. 4) An uncoupler insensitive absorbance decrease stimulated by dark adaptation and anaero­ bic conditions, the difference spectrum o f which resembles that o f ferredoxin reduction. The relative contributions o f P700 and PC to the overall oxidized-reduced difference spec­ trum are determined by redox titration. At 706 nm, 815 nm and 950 nm the P 700/PC is -119/ 19, 67/37 and 31/69, respectively. From these ratios and the molar extinction coefficients a molar P 700/PC stoichiometry o f 1 /3 is determined. 
  Reference    Z. Naturforsch. 46c, 233 (1991); received November 19 1990/January 2 1991 
  Published    1991 
  Keywords    Plastocyanin, Membrane Potential, Ferredoxin, Light Scattering, Photosynthesis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0233.pdf 
 Identifier    ZNC-1991-46c-0233 
 Volume    46 
39Author    Doris Godde, Heribert Schmitz, M. Anfred WeidnerRequires cookie*
 Title    Turnover of the D -l Reaction Center Polypeptide from Photosystem II in Intact Spruce Needles and Spinach Leaves  
 Abstract    , U n iv ersität zu K öln, G yrhofstraße 15, D-5000 K öln, B undesrepublik D eu tsch lan d Z. N aturforsch. 46c, 2 4 5 -2 5 1 (1991); received O cto b er 10, 1990/D ecem ber 17, 1990 D -l Protein, T urnover, P hotosystem II, Stress C o n d itio n s A new m ethod is presented to follow the tu rn o v er o f the D -l reaction center polypeptide o f photosystem II in intact spruce needles o r spinach leaves by in co rp o ratio n o f [14C]leucine. Like in oth er organism s the synthesis an d d eg rad atio n o f this p ro tein is strongly light-dependent and very fast. T he synthesis rate u n d er m o d erate light intensities in healthy spruce needles is about 9 nm ol [l4C]leucine m g -1 C hi h _1. T he half-life tim e o f the D -l p rotein u n d er these c o n ­ ditions is less than 30 m in. In o rd e r to d em o n strate the usefulness o f this m ethod for the stress physiology o f photosynthesis, first experim ents are show n com p arin g the tu rn o v er o f the D -l protein in spruce needles w ith different age an d different degree o f dam age. 
  Reference    Z. Naturforsch. 46c, 245 (1991) 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0245.pdf 
 Identifier    ZNC-1991-46c-0245 
 Volume    46 
40Author    Folkert Wellmann, RalphA. Braham, Rainer Müller, Detlef Gabel, M., D. Lednicer, D. W. Em, S. C. Ert, G.W D Lyster, J. M. Uncan, EdRequires cookie*
 Title    Synthesis and Biological Behavior of a Boronated Analogue of the Antiestrogen U 23,469-M  
 Abstract    A ntiestrogen, B oron, N e u tro n C ap tu re T h erap y , Cell U p tak e A bo ro n ated analogue o f the antiestrogen U 23,469- hem . 12, 881 (1969)) was p repared, for possible use in neutron cap tu re therapy o f estrogen receptor-positive tu m o rs. In this analogue, the term inal OH group was replaced by a B -decachloro-o-carboranyl residue. This co m p o u n d showed a large, non-specific u ptake in Z R 75-1 b reast cancer-derived cells. It could p artially inhibit the uptake o f estradiol in these cells. A ccum ulation in the cells at physiologically o b tainable c o n ­ centrations was, how ever, to o low to envisage a th erap eu tic effect follow ing therm al neutron irradiation. 
  Reference    Z. Naturforsch. 46c, 252 (1991); received N ovem ber 9 1990/ 
  Published    1991 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0252.pdf 
 Identifier    ZNC-1991-46c-0252 
 Volume    46 
Prev
1
2
3
4
5
...
Next