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Volume 28 (164)
Volume 29 (184)
Volume 30 (178)
Volume 31 (164)
Volume 32 (187)
Volume 33 (180)
Volume 34 (244)
Volume 35 (201)
Volume 36 (198)
Volume 37 (207)
Volume 38 (194)
Volume 39 (230)
Volume 40 (179)
Volume 41 (189)
Volume 42 (238)
Volume 43 (156)
Volume 44 (172)
Volume 45 (204)
Volume 46 (171)
Volume 47 (150)
Volume 48 (158)
Volume 49 (134)
Volume 50 (131)
Volume 51 (129)
Volume 52 (132)
Volume 53 (147)
Volume 54 (170)
Volume 55 (150)
Volume 56 (183)
Publication Year
2001 (183)
2000 (150)
1999 (170)
1998 (147)
1997 (132)
1996 (129)
1995 (131)
1994 (134)
1993 (158)
1992 (150)
41Author    Requires cookie*
 Title    Nachweis verschiedener antigener Determinanten vom interspecies Typ in RNS-Tumorviren (C-Typ) der Säuger  
 Abstract    ergleichende serologische U ntersuchung von Viren mehrerer Tierarten und von einem als M enschenvirus deklarierten Isolat E vidence for the E xisten ce o f D ifferent A ntigenic D eterm inants of the Interspecies T ype in M am m alian R N A -C -Type Tumor Viruses 
  Reference    (Z. Naturforsch. 28c, 214 [1973]) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0214 
 Volume    28 
42Author    G. Hiller, W. F.Requires cookie*
 Title    Hybridisierungsversuche mit einer niedermole­ kularen DNA-Fraktion aus embryonalen Ratten­ zellen Hybridisation Experiment with a Low-molecular Weight DNA from Embryonic Rat Cells  
 Abstract    Low-molecular weight DNA, hybridisation, rat cells 
  Reference    (Z. Naturforsch. 28c, 223—224 [1973]; eingegangen am 22. D ezember 1972) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0223_n 
 Volume    28 
43Author    Requires cookie*
 Title    Steroids from Asterias rubens  
 Abstract    G e r h a r d H a b e r m e h l u n d B e r n h a r d C h r is t Steroids, A sterias Seesterne besitzen in ihren Geweben toxische, sapo­ ninartige Substanzen1. Untersuchungen hierüber wur­ den sowohl mit pazifischen als auch atlantischen Spe­ zies unternommen2'33-0. Aus der in der Nordsee heimischen Seesternart Asterias rubens, gefangen im Sommer 1971 in Sylt*, isolierten wir ein Rohsaponin, das dünnschichtchro­ matographisch in fünf verschiedene Komponenten aufgetrennt wurde, von denen eine allerdings nur in geringer Menge aufgefunden wird. Die durch Hydro­ lyse mit Salzsäure daraus erhaltenen Genine der Hauptkomponenten ergaben massenspektrometrisch die folgenden Summenformeln: Asterias rubens — Genin I: C27H420 3, ARG II: C27H44O3, ARG III: CoiHooOq, ARG IV: C21H340 3. Die Strukturen wurden durch IR-, UV-und mas-senspektrometrische Daten aufgeklärt. Die Genine I, II und III konnten als Substanzen identifiziert werden, die bereits aus anderen Seesternarten bekannt waren, nämlich J 9(u)> 2°(22)-5a-Cholestadien-3/?, 6a-diol-23-on (ARG I) aus Acanthaster planci4, Dihydromarthaste-ron (ARG II) aus Marthasterias glacialis5 und zj9(u) 5a-Pregnen-3/?, 6a-diol-20-on (ARG III) aus Asterias 
  Reference    (Z. Naturforsch. 28c, 225—226 [1973]; eingegangen am 16. November 1972) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0225_n 
 Volume    28 
44Author    N. H., H. K., H. H.Requires cookie*
 Title    rc-Paraffins from Japanese A nts  
 Abstract    P . lam e llid en s Sm ith, F . ja p o n ic a M otschulsky, C. obscuripes M ayr, C. ja p o n ic u s M ayr, w-Paraffins (Cn t ° C28) There are numerous reports of the isolation and the identification of ants pheromone. The Japanese ants pheromone, however, has not been investigated. In the course of the systematic studies of ants pheromone, «-hexane extractives of four species of Japanese ants were investigated. The whole bodies of the worker ants (C. japonicus Mayr, P. lamellidens Smith, F. japonica Motschulsky, C. obscuripes Mayr) obtained from Hiroshima Prefec­ ture, Japan were macerated with «-hexane for 2 days at room temperature. The organic layer was separated and from the «-hexane solution, the solvent was removed under reduced pressure. The residue obtained was extracted with ether. The ether solution was dried with sodium sulfate, and concentrated, leaving oily matters. The hydrocarbon fraction was obtained from the oily matters by column chromatography on silica gel with «-hexane. The oxygen-containing fraction which eluted after hydrocarbon fraction is investigated at present. 
  Reference    (Z. Naturforsch. 28c, 226 [1973]; received Jan uary 2 1973) 
  Published    1973 
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 Volume    28 
45Author    N. H., H. K.Requires cookie*
 Title    Chemotaxonomical Studies of the Leaf Oils of L. u m b e lla t a Thunb  
 Abstract    Chemotaxonomy, monoterpenes L. umbellata Thunb. (Kuromoji in Japanese) which belongs to the Lauraceae family, is deciduous shrub and grows on the mountainous distinct all over Japan, The twigs have been used for the tooth picks since they have a fragrant odor. Before World War II, the essential oil (Kuromoji-yu) had been used for the perfume of the soap because it contains large amounts of linalool. The oil, however, has not been isolated at present. Kuromoji is sometime divided into several varieties on the basis of morphological differences. According to the expert opinion of an authoritative, Kuromoji divided into several species and their subspecies. 1 . Kuromoji-L. umbellata Thunb., Himekuromoji-var. membraceae (Maxim.) Momiyama, Kuromoji Obakuromoji-var. lancea Momiyama. 2. Kekuromoji-L. sericea (Sieb, et Zucc.) Blume, Usugekuromoji-var. glabrata Blume. The morphological distinction of these five species, however is not clear. In the previous communication1, we reported the chemotaxonomy of Kuromoji, Keku­ romoji, and Usugekuromoji. In addition to the paper, the leaf oils of Himekuromoji and Obakuromoji be­ longing to the subspecies of Kuromoji were examined from the view point of chemotaxonomy. The leaf oils were isolated from the fresh leaves by steam distillation. The main individual terpene con­ stituents were isolated by column chromatography followed by preparative gas chromatography and identified by IR spectrum and by gas chromatography by comparison with authentic specimens. The results of the investigation are shown in Table I. The percentage of the constituents was cal­ culated from the areas of the peaks of gas chromato­ grams. The main constituents of the plants are fol­ lowing: Kuromoji 1,8-cineole and limonene 37.3 %, linalool 28.6%; Himekuromoji 1,8-cineole and limo­ nene 29.2%, linalool 18.2%, carvone 23.7%; Oba­ kuromoji 1,8-cineole and limonene 35.9 %, linalool 22.9%, caryophyllene 7.8%. We named those three Kuromojis Linalool-kuromoji, Carvone-kuromoji, and 
  Reference    (Z. Naturforsch. 28c, 227—228 [1973]; received December 6 1972) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0227_n 
 Volume    28 
46Author    Z. NaturforschRequires cookie*
 Title    Acid Hydrolysis of Colchicine and Related Compounds  
 Abstract    T h o m a s J . F it z g e r a l d Colchicine, tropolones, kinetics Acid-catalyzed hydrolysis of the methox-ytropone moiety of colchicine has been shown to proceed at a greater rate than in the case of isocolchicine1. (Struc­ tures are shown in Table I.) No interpretation of this rate difference has been offered. And, while a mecha­ 
  Reference    (Z. Naturforsch. 28c, 228 [1973]; received November 20 1972) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0228_n 
 Volume    28 
47Author    Requires cookie*
 Title    Not Freezing Water in the Lamellar System of Chloroplasts  
 Abstract    R o l f -D i e t e r H ir t z a n d W il h e l m M e n k e Chloroplasts, water, PMR-spectroscopy In the course of small angle X-ray scattering analyses K r e u t z and W e b e r 1 observed that the particles of a soluble protein preparation derived from the lamellar system of chloroplasts by treatment with formic acid, exhibited an unusual high water content of 75 per cent. Viscosimetric investigation by M e n k e and R u p p e l 2 with a preparation obtained by a somewhat modified procedure also pointed to a high hydration of the protein particles. A solution of this protein had a limiting viscosity number [n] of 12 ml/g. With an axis ratio of 1:2.4 of the effective flattened hydrodynamic ellipsoid, also a hydration of 76 per cent was calculated. To our knowledge no investigations have been made' on the water content and the state of water in the thylakoid membrane, from which the above mentioned preparations have been obtained. K u n t z , B r a s s f i e l d , L a w , and P u r c e l l 3 observed by means of proton magnetic resonance spectroscopy, that in protein solutions a fraction of the water will not freeze even at —35 °C. The amount of the not freezing water is within the experi­ mental error the same as the amount of hydration water, determined by other methods. It thus appeared obvious to determine with this method the amount of the not freezing water in the lamellar system of chloroplasts. Stroma-freed chloroplasts of Antirrhinum majus, strain 50, were prepared according to an earlier described procedure4. The water signals were measured in the HR-mode with external side bands using a Yarian HA 100 nuclear resonance spectrometer. For temperature regulation the temperature unit V 6040 was used. The temperature of the sample was 
  Reference    (Z. Naturforsch. 28c, 230 [1973]; received Jan u a ry 22 1973) 
  Published    1973 
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 Volume    28 
48Author    M. K.Requires cookie*
 Title    A Method for the Preparation of Plant Protoplasts  
 Abstract    Protoplasts, tissue culture A simple procedure for the preparation of plant cell protoplasts is described. The leaf is first treated with pectinase under conditions that do not liberate cells; cellulase is then used to release protoplasts. The yields are comparable to those obtained by methods that entail the prior preparation of free cells. The method is of general application but is particularly useful with tissues that cannot tolerate the shaking needed to liberate intact cells. The preparation of protoplasts from leaf mesophyll usually requires the use of several enzymes, typically pectinase and cellulase. Only in a few favourable cases is a single enzyme preparation sufficient. The enzymes are used either simultaneously1 or sequen­ tially2. The simultaneous application of several crude enzymes has the great advantage of simplicity, but for several reasons is not as satisfactory as the sequential procedure. Both cells and protoplasts are exposed throughout to all the toxic substances which may be present in the mixture; the efficiencies of the enzymes, particularly cellulase, are often reduced under these conditions so that higher concentrations or much longer periods of treatment are required1-2. When large numbers of protoplasts are required, for example in work with viruses, long periods of digestion are undesirable because of the difficulties in avoiding infections by microorganisms; the rich enzyme solu­ tions encourage any stray organisms to proliferate rapidly. The sequential procedure2 has been used with great success for preparing protoplasts from tobacco leaf mesophyll. It consists of two steps. 1 . The leaf material is shaken with pectinase solu­ tion at 25 °C to release intact mesophyll cells. 2 . The free cells are collected and shaken gently with cellulase solution at 35 °C to convert them to protoplasts. When this method was applied to leaves of pea (Pisum sativum, cv. Chemin Long), the initial shaking with pectinase to release cells caused so much damage that the subsequent treatment with cellulase produced almost no live protoplasts. Reduction of the violence of shaking to prevent damage resulted in negliglible yields of free cells. An extremely simple modification of the procedure was therefore devised which has proved very successful in many cases where the ori­ ginal method was too traumatic. It has also been used 
  Reference    (Z. Naturforsch. 28c, 231 [1973]; received Jan u a ry 8 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0231_n 
 Volume    28 
49Author    Requires cookie*
 Title     
 Abstract    g in g in th e M acronucleus o f P aram ecium V i k t o r S c h w a r t z u n d H e l g a M e i s t e r Aging, DNA, life cycle, macronucleus, P a ra m e c iu m Mit der Erneuerung des Makronucleus, sie mag in der Konjugation oder Autogamie geschehen, beginnt bei Paramecium und anderen Ciliaten der Lebens­ zyklus1-2. Die Caryonide — das ist ein Klon aus einer Zelle mit einem neu entwickelten Makronucleus — durchläuft die Phasen: Unreife (anfängliche Unfähig­ keit zu Sexualvorgängen), Reife (Bereitschaft zu Kon­ jugation und Autogamie) und Seneszenz (definitiver Verlust der Sexualität). Die Caryonide endet ent­ weder in einem Se'xualprozeß mit Neubildung des Makronucleus oder, nach Seneszenz, im Tode. Die Dauer der Phasen wird in Teilungsschritten gemessen, nicht in Zeiteinheiten, weil die Teilungsfrequenz (Zell­ teilungen/Zeiteinheit) in hohem Maße temperaturab­ hängig ist. Die Frage, was in der Zelle altere, ist nicht entschieden. Die "Verjüngung", die nach der Meiose und Befruchtung auftritt, ist mit der Neubildung des Makronucleus verknüpft. Sie leitet einen neuen Cyklus ein. Daher sind Überlegungen angestellt worden, ob wohl der Makronucleus altert und schließlich durch einen neuen ersetzt werden muß oder ob alterndes Cytoplasma der Zufuhr bestimmter Stoffe aus dem Abbau des alten Makronucleus bedarf3. Morphologisch nachweisbare Altersveränderungen am Makronucleus sind unbekannt. Bei der Untersuchung interphasischer Syntheseab­ läufe traten Diskrepanzen zwischen eigenen Meßergeb­ nissen und denen unserer Mitarbeiterin Frau E. J u s t 4 auf. Sie ließen unter anderem die Deutung zu, daß der DNS-Gehalt des Makronucleus einer Altersver­ änderung unterliege. Schon die ersten Versuche an verschiedenen Paramecium-Arten bestätigten diese Vermutung. Bis zum Erscheinen der ausführlichen Veröffentlichung unserer Versuche im Archiv für Pro­ tistenkunde werden noch einige Monate benötigt. Eine inzwischen erschienene Arbeit über das Altern mensch­ licher Epidermiszellkerne5 läßt derartige Untersuchun­ gen an Paramecium heute als notwendig erscheinen. Deshalb wird diese Kurzmitteilung gegeben. 
  Reference    (Z. Naturforsch. 28c, 232 [1973]; eingegangen am 29. Jan uar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0232_n 
 Volume    28 
50Author    E. W., J.C BRequires cookie*
 Title    The T otal Syn thesis o f N orleucine-13-M otilin (P relim in ary Com munication)  
 Abstract    e i m e r , F. D r e e s , E . J a e g e r , J . M u s io l , R. S c h a r f , H. S t o c k e r , P. T h a m m und G. W e n d l b e r g e r H errn Prof. D r. W. G r a s s m a n n , emeril. Direktor des M ax-P lan ck-In stitu ts f ü r Eiweiß-und Lederforschung, anläßlich seines 75. Geburtstages in W ürdigung seiner großen Verdienste um die Förderung der Peptidchemie, eines dem Institut durch Prof. D r . M a x B e r g m a n n verbundenen Zweiges der wissenschaftlichen Forschung, gewidmet The synthesis of a norleucine analog of the gastric motility increasing and pepsin output stimulating hormone motilin, a linear oligopeptide with 22 amino acid residues, is described: The preparation of 6 partial sequences was carried out at first. The side-chain functions of poly-functional amino acids were protected with groups based on tertiary alcohols and easily re­ movable by acidolysis; the complex function of arginin was masked partially by N w ,N a-dia-cylation and partially by protonisation. Subsequently the 6 fragments were condensed to yield the protected total sequence [1-22]; after cleavage of all protective groups the crude synthetic product was purified successfully by ion exchange chromatography. 
  Reference    (Z. Naturforsch. 28c, 235 [1973]; eingegangen am 19. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0235 
 Volume    28 
51Author    Helmut Günther, MiguelA. Alizade, Max Kellner, Florian Biller, Helmut SimonRequires cookie*
 Title    Preparation of (1R )[1— 2H]-and (1S)[1—2H]-Alcohols by Exchange Reactions Catalyzed by Yeast or a Coupled Enzyme System  
  Reference    (Z. Naturforsch. 28c, 241 [1973]) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0241 
 Volume    28 
52Author    C.Requires cookie*
 Title    Komplexbildung von Dehydrogenasen mit Coenzymanalogen und Coenzymbruchstücken  
 Abstract    om plexform ation o f D ehydrogenases w ith Coenzyme Analogues and Coenzyme Fragm ents D i e t m a r S c h e r r , R e in h a r d J e c k , J ü r g e n B e r g h ä u s e r u n d Ch r ist o p h W o e n c k h a u s Coenzyme analogues, dehydrogenases, difference spectra The spectral properties of binary complexes of NAD-analogues and fragments therefrom with I.DH from pig heart or ADH from liver and yeast have been investigated. The NADH-analogues were modified by replacing adenine through benzimidazole, benzene or dihydronico­ tinamide. Additionally adenosine diphosphate ribose, dihydronicotinamide and dihydronicotina-mide-ribose pyrophosphate-5"-ribose have been studied. It has been shown by means of difference spectra that complexes between ADH from horse liver and analogues cause spectral changes in the region of aromatic absorption at 280 nm even when adenine is absent in the analogues. Spectral changes in the other enzymes mentioned are probably due to changes of the n -n* absorption of the adenine ring. The spectral changes upon complexing indicate hydrophobic interaction of the adenine with the enzyme protein. Fluores­ cence spectra vary in the intensity of the energy transfer band as well as in coenzyme emission depending on variation of the coenzym analogue. Changing of complex formation between protein and analogues at different pH-values are investigated. ADH from yeast, especially, shows a pK around 6 which suggests interaction with histidine imidazole. 
  Reference    (Z. Naturforsch. 28c, 247 [1973]; eingegangen am 17. November 1972/27. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0247 
 Volume    28 
53Author    Wolfgang Steglich, Edda Töpfer-PetersenRequires cookie*
 Title    Neue Pigmente vom Flavomannin-Typ aus Cortinarius vitellinus (Agaricales) Pigments of Fungi, XIV Novel Pigments of the Flavomannin Type from Cortinarius vitellinus (Agaricales)  
  Reference    (Z. Naturforsch. 28c, 255 [1973]; eingegangen am 20. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0255 
 Volume    28 
54Author    A. Guiotto, P. Rodighiero, U. FornasieroRequires cookie*
 Title    Furocoumarins from the Seeds of Citrus trifo liata L  
 Abstract    Citrus trifoliata, Rutaceae, furocoumarins A detailed study of the furocoumarins present in the seeds of Citrus trifoliata L. revealed the presence of isopimpinellin, prangenin and prangenin hydrate in addition to the already reported bergapten and imperatorin. The amount of these compounds, referred to the starting dry material, were: Imperatorin 0.15%, bergapten 0.06%, whereas isopimpinellin, prangenin and prangenin hydrate were found in the order of less than 0.01%. 
  Reference    (Z. Naturforsch. 28c, 260 [1973]; received November 11 1972/March 26 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0260 
 Volume    28 
55Author    P. PohlRequires cookie*
 Title    Light-induced Changes of Radioactivities in the 14C-labeled Lipids and Fatty Acids of Dark Grown Euglena gracilis  
 Abstract    Euglena gracilis, light-effect, lipids, fatty acids Euglena gracilis was grown in the dark for 12 days in a medium containing sodium acetate-1-14C. The major amount of 14C was incorporated into the neutral lipids. In these compounds myristic acid was the main fatty acid labeled. Subsequent growth in light (70 hours) in an iden­ tical medium (containing unlabeled acetate) led to a strong decrease of radiocarbon in the neutral lipids. The radioactivities in phosphatidyl choline and phosphatidyl ethanolamine increased during the first 28 hours of illumination and thereafter decreased. The radioactivities in phosphatidyl glycerol, sulfolipid, monogalactosyl diglyceride and digalactosyl diglyceride increased continously. After 70 hours of illumination, most of the radiocarbon was detected in the saturated and un­ saturated Cie and C18 fatty acids of these four lipids. The possibility of light-induced transfers of fatty acids from neutral lipids via phospholipids to 
  Reference    (Z. Naturforsch. 28c, 264 [1973]; received September 6 1972/February 16 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0264 
 Volume    28 
56Author    P. PohlRequires cookie*
 Title    Some Evidence for Light-induced Transfers of Fatty Acids in Euglena gracilis  
 Abstract    E uglena gracilis, acyl transfers, light-effect, lipids, fatty acids Euglena gracilis was grown in the dark for 12 days. Subsequent incubation with sodium octa-noate-l-14C in the dark for 6 hours resulted in a rather specific incorporation of radioactivity into the neutral lipids (primarily wax esters). Upon illumination of these cells in an identical medium without radiocarbon, the radioactivities in the neutral lipids decreased strongly, due to a decrease of the labeled wax acids (mainly 1 4 :0) and wax alcohols (mainly C14). The radioactivities in phosphatidyl choline and phosphatidyl ethanolamine increased during the first 24 hours of illumina­ tion and thereafter decreased. This was caused by the initial increase and subsequent decrease of the labeled 1 4 :0 and 1 6 :0 acids in phosphatidyl choline and of the 1 4 :0 , 1 6 :0 , and 18:1 acids in phosphatidyl ethanolamine. The chloroplast lipids (sulfolipid, phosphatidyl glycerol, mono-galactosyl diglyceride, and digalactosyl diglyceride) exhibited a steady increase in radiocarbon content. This was due to an increase of label in the 1 6 :0 fatty acid of the sulfolipid, in the 1 6 :0 and irans3-16:l fatty acids of the phosphatidyl glycerol, and in the saturated and unsaturated C16 and C18 fatty acids of the monogalactosyl and digalactosyl diglycerides. The labeled fatty acids of the above phospho-and glycolipids had comparably high specific radioactivities. Incorporation of radiocarbon into the last two carbon atoms of their methyl ends, however, was low. The glycerol and sugar moieties of the individual lipids incorporated relatively little radiocarbon. It is con­ cluded that in E uglena gracilis the biosynthesis of long chain fatty acids is associated with specific lipids. Upon illumination, oxidative breakdown of the neutral lipids as well as transfers of fatty acids from the neutral lipids via phosphatidyl choline and phosphatidyl ethanolamine to the chloro­ plast lipids seem to be induced. The lipids involved appear to function as parts of a "lipid-bridge" for the acyl transfers. 
  Reference    (Z. Naturforsch. 28c, 270 [1973]; received September 26 1972/February 16 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0270 
 Volume    28 
57Author    P. Pohl, G. D. RathRequires cookie*
 Title    Stickstoff-Ausscheidung durch N 2-fixierende Blaualgen, I at Different Tem peratures, and under Light of Different Wavelengths  
 Abstract    Züchtung von Anabaena cylindrica und N ostoc muscorum in verschiedenen Nährlösungen, bei unterschiedlichen Tem peraturen und unter Licht verschiedener W ellenlänge Nitrogen Excretion by Nitrogen Fixing Blue-green Algae, I Growth of Anabaena cylin drica and N ostoc muscorum in Various Media, Nitrogen excretion, nitrogen fixing blue-green algae, A nabaena cylin d rica , N ostoc m uscorum The nitrogen fixing blue-green algae, A n abaen a cylin d rica and N ostoc m uscorum , were grown as 7 1 cultures in various media, at different temperatures (15 °C and 23 °C), and under light of different wavelengths. In all cases, the amount of combined nitrogen excreted into the medium readied a value of 700 — 800 ^M ol N /l of nutrient medium after 4 —6 weeks of growth. Thereafter, this value did not increase significantly. When several cultures of algae were successively grown in the same medium, or when culturing was carried out for a long time with frequent harvesting, the nitrogen content of the nutrient medium remained at approximately the same level as mentioned. The possible reasons for these observations are discussed. E in le itu n g 
  Reference    (Z. Naturforsch. 28c, 285 [1973]; eingegangen am 13. November 1972/6. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0285 
 Volume    28 
58Author    H. LorenzRequires cookie*
 Title    Der Einfluß von L-Äthionin auf Blutungsrate und Ionentransport im Blutungssaft The Influence of L-Ethionine on Bleeding Rate and Ion Transport within the Bleeding Sap  
 Abstract    Enthionine, bleeding rate, ion transport The bleeding rate as well as transport of K+, N 0 3" and P 0 4 within the bleeding sap of corn plants (Zea mays) has been studied in intervals after raising the nitrate concentration of the nutrient solution from 5 to 10 meq/1. Acceleration of the exudation process in response to increased nitrate supply is accomplished after a lag phase. During this lag phase L-ethionine causes a marked stimulation of bleeding sap exudation. A very close correlation (coefficient of correlation r = 0,996) was found between bleeding rate and phosphate transport within the bleeding sap, whereas transport of K+ (r = 0,868) and N 0 3" (r= 0,773) is not that closely correlated. Because phosphate is translocated to the Xylem after it has been metabolized in a series of organic phosphorous compounds it is concluded that the exuda­ tion process is primarily linked to oxidative phosphorylation in the root, which is apparently stimulated by ethionine after a lag period. Acceleration of respiratory chain phosphorylation may be brought about by increasing the amount of phosphate acceptors. 
  Reference    (Z. Naturforsch. 28c, 292 [1973]; eingegangen am 25. Januar/6. März 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0292 
 Volume    28 
59Author    Requires cookie*
 Title    Die organspezifische Photodetermination der Entwicklung von Peroxydaseaktivität im Senfkeimling ( Sinapis alba L.) durch Phytochrom  
 Abstract    I. K in etisch e A nalyse O rgan-specific P h o to d e te rm in a tio n b y P h y to c h ro m e o f th e D ev e lo p m e n t o f P e ro x id a se A c tiv ity in M u sta rd Seedlings (S in a p is alba L.) I. K in etic analysis P e t e r S c h ö p f e r u n d C l a u d i a P l a c h y In stitut für Biologie II, U niversität Freiburg i. Br. Phytochrome, peroxidase, photodetermination, enzyme activity, S in apis alba The development of extractable peroxidase activity in the mustard seedling is controlled by phytochrome (P fr; operationally: Continuous far-red light) in an organ specific manner (en­ hancement in the cotyledons and taproot, inhibition in the hypocotyl; Tables I, II). Detailed kinetics of peroxidase accumulation in the cotyledons (Figs. 2, 3) reveal the existance o f a two-step induction mechanism: 1. Formation o f a stable transmitter during a period o f com­ petence to Pfr ("determination phase"), and 2. development of peroxidase activity mediated by the transmitter during a later period of competence to the transmitter ("realization phase"). These tw o periods o f seedling development are completely separated in time. 
  Reference    (Z. Naturforsch. 28c, 296 [1973]; eingegangen am 25. Januar/23. Februar 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0296 
 Volume    28 
60Author    Requires cookie*
 Title    Chemiluminescence Arising from the Action of 1A g-Molecular Oxygen on Chlorophyll-a  
 Abstract    H a r t m u t F u h r * a n d J o a c h im S t a u f f In stitut für Physikalische Biochem ie der U niversität Frankfurt/Main D edicated to T h e o d o r W i e l a n d on the occasion o f h is 60th birth day Chlorophyll-a, singlet oxygen (M g) chemiluminescence, kinetics Singlet oxygen g) was generated by a microwave discharge and bubbled through a solution of chlorophyll-a in dibutylphtalate at approximately 10-20 torr. It not only excited the dye to its first singlet state but also produced oxidized species which generated a very long lasting weak chemiluminescence. From quenching experiments for the generation of the excited species could computer simulation. 
  Reference    (Z. Naturforsch. 28c, 302—309 [1973]; received December 22 1972/March 2 1973) 
  Published    1973 
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 Identifier    ZNC-1973-28c-0302 
 Volume    28 
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