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1972 (397)
41Author    Wolfgang Jeitschko, ArthurW. SleightRequires cookie*
 Title    The Crystal Structures of HgMo04 and two Forms of SnW04  
 Abstract    Two forms of SnW04 have been prepared for the first time by reaction of SnO and W03 in evacuated silica capsules at temperatures between 600 and 900 °C. The two modifications transform into each other by a fast but diffusion-controlled phase transition at 670 °C. Single crystals of a-SnW04 were prepared by slow cooling from below the transition temperature. They are orthorhombic (Pnna) with a = 5.627, b = 11.649, c = 4.997 Ä, and Z = 4. Metastable £-SnW04 can be obtained through rapid quenching from above 670 °C. It is cubic (P2t3) with a = 7.299 Ä, and Z = 4. Single crystals of HgMo04 are monoclinic with a = 11.282, 6 = 6.055, c = 5.154Ä, £ = 112.27°; the space group is C2/c and Z = 4. The structures have been solved and refined from single crystal x-ray data. Final conventional 7?-values are 0.032 (498 observed reflections) for a-SnW04, 0.034 (248 observed reflections) for ß-SnW04, and 0.025 (853 reflections, including unobserved) for HgMo04 . Positional parameters are as follows: 
  Reference    (Z. Naturforsch. 27b, 203 [1972]; received December 4 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0203_n 
 Volume    27 
42Author    D. Hankel, H. G. Von Freyberg, A. DoiwaRequires cookie*
 Title    Zerfalls an Cu-Phtalocyanin New Results about Decomposition of Formic Acid by Cu-Phtalocyanine  
 Abstract    Anknüpfend an frühere Untersuchungen 1-4 wurde der Zerfall des Dampfes wasserfreier Ameisensäure an Cu-Phtalocyanin gemessen. Die verwendete Apparatur arbeitet nach der statischen Methode, von bekann-ten 5 > 6 ' 4 unterscheidet sie sich durch folgende Verbes-serungen : 1. Zur Vermeidung von Einflüssen des Hg-Dampfes auf die Katalysatoreigenschaften erfolgt die Druckmes-sung mit Hilfe eines Bodenstein -Quarzspiral-manometers. Der Vergleichsdruck wird mittels eines Kathetometers an einem senkrecht stehenden Queck-silbermanometer abgelesen. Der Ameisensäuredampf kommt nicht mit Quecksilber in Berührung. 2. Durch Verwendung von Kapillaren 4 wurde das aus dem Ofen herausragende Totvolumen auf 2,4% des gesamten Zersetzungsvolumens verringert. 3. Die Temperatur des Reaktionsraums wird durch einen elektronischen Zweipunktregler auf + 0,9°C konstant gehalten. Die Präparation der Katalysatoren erfolgte in be-schriebener Weise 3 . Röntgenbeugungsdiagramme 7 und IR-Aufnahmen 8 sicherten, daß die so erhaltene /?-Mo-difikation 4 weder durch a-Modifikation noch durch metallfreies Phtalocyanin verunreinigt war. Katalysa-tor Nr. 1 bestand aus bis zu 15 mm langen Nadeln, 
  Reference    (Z. Naturforsch. 27b, 204 [1972]; eingegangen am 15. November 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0204_n 
 Volume    27 
43Author    D. Schulte-Frohlinde, D. Sänger, C. V. SonntagRequires cookie*
 Title      
 Abstract    Wir haben beobachtet, daß bei der Photolyse (A = 185 nm) von tert.-Butanol in Mischungen mit n-Hexan die Quantenausbeute der Produkte in einem auffallend großen Ausmaß vom Mischungsverhältnis abhängt, ob-wohl das n-Hexan im ganzen untersuchten Bereich kein Licht absorbiert. Die Quantenausbeute (0) für die Bildung des Wasserstoffs steigt bis zu einem Zusatz von 99% «-Hexan um das Fünffache an, während die Quantenausbeute für die Bildung von Methan abfällt (Abb. 1). 50 Vol-% 100 n-Hexan 
  Reference    (Z. Naturforsch. 27b, 205—206 [1972]; eingeg. am 15. November 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0205_n 
 Volume    27 
44Author    E. Bayer, H. KneifelRequires cookie*
 Title    Isolation of Amavadin, a Vanadium Compound Occuring in Amanita Muscaria  
 Abstract    The toadstool Amanita muscaria is relatively rich in vanadium and contains up to 120 ppm vanadium per g dry weight 1 . Therefore we investigated the possibility of isolating a vanadium chelate from it. The vanadium distribution does not show a high enrichment in any part of the mushroom, only the stems showing somewhat higher concentrations (Table 1). For this reason the whole mushroom was extracted. [ppm/dry weight] 
  Reference    (Z. Naturforsch. 27b, 207 [1972]; received November 29 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0207_n 
 Volume    27 
45Author    Schilde-RentschlerRequires cookie*
 Title     
 Abstract    The preparation of plant protoplasts from leaf meso-phvll 1 is now commonly used for biochemical, physio-logical and developmental studies of plant cells. When large amounts of cells are required, the peel-ing of the epidermis may become a serious drawback of this method. Therefore we tried to find an enzyme to digest the cutin of the epidermis cells so that the macerozyme (All Japan Biochemicals Ltd., Nishino-miya, Osaka, Japan) may act on the pectinate middle lamella. Among seven enzyme preparations we found two that could be used and did not adversely affect the viability of the protoplasts. The plants, Nicotiana tabacum var. "Samsun", were cultivated in the green house with additional illumina-tion (Osram Fluora; 21— 8 o'clock) during autumn and winter. The leaves we used were usually the just grown up ones of each plant. Sterilization was done as described 2 . For the experiment the leaves were cut into pieces of about 4 cm 2 . The enzyme preparations were: 1. /^-glucuronidase from E. coli (Type II of Sigma Chemical Company, St. Louis, Missouri). It was suspended at a concentra-tion of 5 mg/ml either in a) M/15 phosphate-buffer pH 7,0 or b) 0,7 M mannitol in M/15 phosphate buffer pH 7,0. 2. Pectin-glycosidase from Aspergillus (Schuchardt, München), the pH optimum of which is around pH 4,0. We suspended it at a concentration of 
  Reference    (Z. Naturforsch. 27b, 208 [1972]; received January 7. 1972) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0208_n 
 Volume    27 
46Author    J. B. Harborne, DaleM. SmithRequires cookie*
 Title      
 Abstract    Continuing studies of flavonoid distribution patterns in plants have indicated that flavonoid pigments are useful phyletic markers, providing new information on the relative primitiveness or advancement of particular plant taxa 2 . One class of flavonoid of especial interest are the desoxyanthocyanins, pigments lacking the 3-hydroxyl present in ordinary anthocyanins and which are presumably biosynthetically simpler. That they are primitive characters is borne out by the fact that they occur primarily in certain mosses 3 and as pigments in juvenile fronds of ferns 4 . The same pig-ments do, however, occur regularly in one higher plant family, the Gesneriaceae. Production here is cor-related with selection for orange red flower colour favoured by hummingbird pollinators and this is con-firmed by the fact that they are completely confined to one subfamily, the Gesnerioideae, which is geogra-phically restricted to the New World where humming-birds are common pollinators 4 ' 5 . 
  Reference    (Z. Naturforsch. 27b, 210 [1972]; received December 14 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0210_n 
 Volume    27 
47Author    M. MaiwaldRequires cookie*
 Title    Sphaerosomen in hexagonaler Anordnung nach ZeHzentrifugation Spherosomes in Hexagonal Array after Cell Centrifugation  
 Abstract    Die Packung von gleichartigen, in Zellen enthaltenen Partikeln zu Gebilden mit kristallartiger Ordnung ist von großen Makromolekülen in Form von Proteinkri-stallen, bei Viren und experimentell ausgelöst bei Ribo-somen bekannt. Außer den hexagonal dicht gepackten Augenfleckglobuli 1 von Algen und den Lipidtropfen in Chloroplasten 2 wurden keine Komplexe von größe-ren geordneten Zellelementen beschrieben. Bei licht-mikroskopischer Untersuchung von zentrifugierten Zel-len aus der Schuppenepidermis der Zwiebel (Allium cepa L.) fanden sich Sphaerosomen — sie sind aus vie-len pflanzlichen Objekten bekannt 3 — in kristallarti-ger Packung. Untersucht wurden abgelöste Epidermisstücke aus Segmenten verschiedener Zwiebelsorten, die einer 18-stdg. Zentrifugation bei 18 000rpm (25 000 g) und 6 °C in einer WKF 30 S-Zentrifuge ausgesetzt waren. Durch diese Behandlung schichteten sich die Zellorga-nellen innerhalb der prismatischen Zellen nach ihrer spezifischen Dichte, wie dies an anderen Objekten audi beobachtet wurde 4 . Die Sphaerosomen fanden sich un-geordnet in einer Bande zentripetal über der Vakuole. Es wurden aber wiederholt Zwiebelsegmente gefun-den, in denen sie jeweils in nahezu allen Epidermis-zellen in Form von geordneten Paketen vorlagen, in-nerhalb derer eine hexagonale Ordnung herrschte 
  Reference    (Z. Naturforsch. 27b, 211 [1972]; eingegangen am 5. November 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0211_n 
 Volume    27 
48Author    Eberhard KussätherRequires cookie*
 Title      
 Abstract    Das parasympathische Nervensystem läßt sich durch zahlreiche Substanzen beeinflussen, die man nach ihrer pharmakologischen Wirkung in verschiedene Gruppen einteilt. Die Parasympathikomimetika, zu denen das Acetylcholin und das Pilocarpin gehören, entfalten ihre Wirkung an den Rezeptoren der Zellen, die durch das parasympathische System beeinflußt werden. Die Cholinesterasehemmstoffe (z. B. Physostigmin, Neostigmin) verhindern den physiologischen Abbau des Acetylcholins durch die Cholinesterase. Die Parasympathikolytika (z. B. Atropin, Scopol-amin) blockieren die Wirkung von Acetylcholin und Pilocarpin am Rezeptor. Bezüglich des Zusammenhangs der chemischen Struk-tur dieser Moleküle mit ihrer pharmakologischen Wir-kungsweise weiß man, daß für die Parasympathiko-mimetika eine N®Me3-Gruppe wesentlich ist 1 . PFEIF-FER 2 sieht eine besondere Anordnung der verschiede-nen Gruppen im Acetylcholin, Physostigmin und 
  Reference    (Z. Naturforsch. 27b, 212 [1972]; eingegangen am 20. November 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0212_n 
 Volume    27 
49Author    Klaus Münk, Thomas FrickRequires cookie*
 Title    Effect of Poly I:C-induced Interferon on Herpes Virus Hominis Infection in Vitro and in Vivo  
 Abstract    Dedicated to Prof. WERNER SCHÄFER on the occasion of his 60th birthday In this study the effect of poly I:C-induced interferon on Herpesvirus hominis (HVH) infec-tion in vitro and in vivo was investigated. The in vitro results revealed a significant effect of interferon on infections of HVH strains of different origin in mouse embryonic cells. The in vivo experiments performed in the HVH-mouse system indicate that the effective induc-tion of interferon in an aminal increases its resistance to subsequent infection with HVH. This study represents results from an investiga-tion of three related problems. This first problem was to determine whether mouse serum containing poly I:C-induced interferon was an effective inhibi-tor of herpes virus hominis (HVH) infection in mice. The second problem was prompted by the pre-vious work of HAMILTON et al. who showed that addition of complexed polynucleotides to cell cul-tures resulted in a reduced number of plaques in a plaque test for HVH. Our aim was to find whether the addition of poly I :C-induced interferon to cell cultures would result in an even greater decrease in the number of plaques than that obtained by HAMIL-TON et al. 1 . Finally, the sensitivity to interferon-containing sera of HVH strains of different origins was investigated. Mice of the incest strain STU were used, not only for the production of interferon, but also for the in vivo tests, and as the source of embryonic cells for the in vitro tests. Studies on the effect of interferon on HVH-induced encephalitis were reported by CATALANO and BARON 2 . Also, the effect of interferon induced by complexed polynucleotides on herpes virus infec-tions, in vitro and in vivo, was studied by HAMILTON et al. 1 . 
  Reference    (Z. Naturforsch. 27b, 220—222 [1972]; received January 19 1972) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0220 
 Volume    27 
50Author    Thomas GrafRequires cookie*
 Title    A Simple Technique for the Detection and Classification of Latent Avian RNA Tumor Viruses  
 Abstract    Dedicated to Prof. WERNER SCHÄFER on the occasion of his 60th birthday A rapid and simple technique for the detection of latent RNA tumor viruses has been described. It is based on phenotypic mixing between the latent agent (s) and a nondefective strain of RSV used as indicator virus. Most of the embryos from two different chicken lines tested so far contain such agents. According to their host range and serological properties they belong to subgroup E. The phenotypic mixing assay may also be applied for the titration of nontransforming viruses in general. Two methods have been mainly applied for the detection of nontransforming avian tumor viruses in chick embryo cells. The resistance inducing fac-tor (RIF) test 1 is based on the property of these viruses to interfere with the superinfection of an-other avian tumor virus possessing a similar coat antigenicity. By means of this technique, as well as others, avian tumor viruses were classified into the subgroups A, B, C and D 2 -3 . The second method, the COFAL test, is based upon the detection of viral group specific (gs) antigen produced by virus in-fected cells 4 ' 5 . Despite the availability of both tech-niques, widespread latent avian tumor viruses re-mained undetected until very recently. These agents, called chicken helper factor 6 , RAV-0 7 or RAV-60 8 , were shown to belong to a new subgroup, E 9 . In addition they seem to differ from common "RIF" viruses in that they are fre-quently contained in chicken cells in a repressed form. From this state they may be released after superinfection with another chicken tumor virus 8 or after exposure of the cells to various physical or chemical treatments 9 . Conventional assay techniques are not adequate for the detection of such repressed agents. The RIF test is not useful because a latent virus infection would only be detectable if virus particles or viral coat antigen is produced by the cell. And even then the assay might be inappropriate since RAV-0 pro-ducing cells have been found to interfere only slightly with the superinfection of a subgroup E pseudotype of RSV 7 . Similarly, the COFAL test 
  Reference    (Z. Naturforsch. 27b, 223—226 [1972]; received December 17 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0223 
 Volume    27 
51Author    R. Rott, H. Becht, H.-D Klenk, C. ScholtissekRequires cookie*
 Title    Interactions of Concanavalin A with the Membrane of Influenza Virus Infected Cells and with Envelope Components of the Virus Particle  
 Abstract    Dedicated, to Prof. WERNER SCHÄFER on the occasion of his 60th birthday Treatment of host cells with Concanavalin A prevents the assembly or release of fowl plague virus from chick fibroblasts and inhibits fusion of BHK cells by the paramyxovirus SV5. Metabolic events of the host cells are not greatly impaired during the early phase of infection. There is evi dence that the carbohydrate moiety of the Con A receptor of fowl plague virus is associated with the viral neuraminidase. Agglutination by Concanavalin A (Con A) is one of the manifestations of the alterations which the membranes of the host cells undergo after they had been infected with enveloped viruses. This pheno-menon has been observed with a large number of RNA viruses and vaccinia virus in various cell systems, and it could never be observed with non-enveloped viruses 1-4 . Since parts of the cell mem-branes altered during the budding process form the matrix of the viral envelopes, it was not surprising to find suspensions of completed virus particles to be agglutinable by Con A 2 ' 5 . This means that the specific receptors for the phytagglutinin are exposed at the surface of the infected cell and appear in the viral envelope. Agglutinability of fowl plague in-fected fibroblasts occurs very early during the re-plication cycle, even before hemagglutinin or in-fectious virus is released into the medium 1 . Expo-sure of Concanavalin A receptors seems to be among the earliest changes demonstrable in an infected cell. This observation prompted us to study the in-fluence of Con A on viral replication, particularly on the synthesis of viral components and on viral release. Since it had been shown that removal of the outer layer of the viral envelope by bromelin left a spikeless particle which was not agglutinable by Con A any longer 5 , we tried in a further series of experiments to determine more precisely whether the specific receptor determinant is associated with hem-agglutinin or neuraminidase, the components re-moved by the bromelin treatment. 
  Reference    (Z. Naturforsch. 27b, 227—233 [1972]; received December 12 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0227 
 Volume    27 
52Author    A. P. WatersonRequires cookie*
 Title    Serum Hepatitis and the Seroprophylaxis of Measles  
 Abstract    Dedicated, to Prof. WERNER SCHÄFER on the occasion of his 60th birthday The events leading to the recognition of serum hepatitis ("homologous serum jaundice") as a disease entity are described and reasons given why seroprophylaxis against measles played an important role in this discovery. The injection of human serum as a prophylactic was practised on an in-creasing scale from about 1920 to about 1950, by which time it had largely been superseded by immunoglobulin (gamma globulin). Apart from the transfusion of blood and blood products the other major human to human transfer of material was vaccination against yellow fever in the years 1937 — 1940. The consequences of this large scale interchange between human subjects included the dissemination of serum hepatitis virus, and the possibility of transfer of other viruses is discussed. 
  Reference    (Z. Naturforsch. 27b, 233—241 [1972]; received January 20 1972) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0233 
 Volume    27 
53Author    AlanP. Kendal, Elva Minuse, FredM. DavenportRequires cookie*
 Title    An Improved Procedure for Measuring Neuraminidase Antibodies by Hemagglutination-inhibition  
 Abstract    Neuraminidase antibodies are known to inhibit hemagglutination by X-15 and X-15 (HK) recom-binant viruses. However, the level of inhibition observed varies when different batches of chicken erythrocytes are employed, and the test generally detects neuraminidase antibodies with less sensi-tivity than an enzyme inhibition test. By titrating neuraminidase antibodies in the presence of anti-IgG globulins, with appropriate specificity, the hemagglutination-inhibition activity of neur-aminidase antibodies is enhanced and the effect of cell variation is minimized. Consequently results obtained with this modified method for titrating neuraminidase antibodies become comparable to those obtained by measuring enzyme-inhibition. The improved hemagglutination-inhibition proce-dure possesses the important advantages of greater convenience and economy. Similar enhancing effects may also be obtained with egg white and guinea pig serum. Neuraminidase (E.C. 3.2.1.18) is an enzymic component of influenza viruses, and shows anti-genic specificity and variation independent of viral hemagglutinin 1 "" 4 . Methods for detection of anti-bodies to neuraminidase have until recently been based on chemical determination of free sialic acid 5 ' 6 . An alternative method for titrating anti-bodies to the neuraminidases of Asian and Hong Kong influenza viruses is by measuring hemaggluti-nation inhibition with a suitable recombinant in-fluenza virus 7 ~ 9 . This report describes improve-ments in the latter method, by use of which results become comparable to those obtained with the che-mical test and are more readily achieved. In conse-quence, studies on the possible epidemiological significance of neuraminidase antibodies are faci-litated. 
  Reference    (Z. Naturforsch. 27b, 241—245 [1972]; received December 31 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0241 
 Volume    27 
54Author    M. J. Sparks Levitch, EdwardA. EckertRequires cookie*
 Title    Structural Studies of the Ribonucleoprotein G-Antigen of Influenza Virus  
 Abstract    The physical and serological states of ribonucleoprotein antigen, released by dissociation of influenza virus, have been characterized. While the simplest antigenic derivative has a sedimenta-tion constant of 4s, more complex antigenic forms, 19s, 38s, and 60s have been identified and isolated. The physical dimensions of isolated g-antigen are dependent on the form of pretreatment of virus concentrate and on the method of virus disruption. The properties of several isolated sub-structures vary, depending on interaction of the protein with host antigen and nucleic acid. The results suggest that influenza virus ribonucleoprotein associates readily with host antigens and that this interaction plays a significant role in initiating the process of budding which leads to release of mature virus. 
  Reference    (Z. Naturforsch. 27b, 246—251 [1972]; received December 31 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0246 
 Volume    27 
55Author    V. Bachofen, R. J. Schweyen, K. Wolf, F. KaudewitzRequires cookie*
 Title    Quantitative Selection of Respiratory Deficient Mutants in Yeasts by Triphenyltetrazolium Chloride  
 Abstract    Dedicated to Prof. WERNER SCHÄFER on the occasion of his 60th birthday Triphenyltetrazolium chloride exhibits a strong growth inhibition in respiratory competent cells but shows only minor effects in respiratory deficient mutants of Saccharomyces cerevisiae and Schizosaccharomyces pombe. Use of this dye thus allows rapid selection of rarely occurring respi-ratory deficient mutants, showing karyotic as well as extrakaryotic inheritance. Mutation induction by tetrazolium chloride was not observed. The results favour the hypothesis that triphenyltetra-zolium chloride interferes with the terminal oxidase of the respiratory chain. 
  Reference    (Z. Naturforsch. 27b, 252—256 [1972]; received January 14 1972) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0252 
 Volume    27 
56Author    Peter Decker, Alfred SpeidelRequires cookie*
 Title    Offene  
 Abstract    Systeme die zwischen mehreren stationären Zuständen zu "mutieren" vermögen ("Bioide") und die präbiologische Rolle der autokatalytischen Kondensation von Formaldehyd systems, open — mutation, chemical — life, origin of — formaldehyde, prebiological role — prebiological, formaldehyde, role of. 
  Reference    (Z. Naturforsch. 27b, 257—263 [1972]; received Juni 28 1971 revised December 16 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0257 
 Volume    27 
57Author    K.Heinz TrautmannRequires cookie*
 Title    In Vitro Studium der Trägerproteine von 3 H-markierten juvenilhormonwirksamen Verbindungen in der Hämolymphe von Tenebrio molitor L. Larven In Vitro Study of the Carrier Proteins of 3 H-labelled Juvenile Hormone Active Compounds in the Haemolymph of Tenebrio molitor L. Larvae  
 Abstract    The labelling of Methyl 7,ll-dichloro-3,7,ll-trimethyl-2-dodecenoate and Methyl 10,11-epoxy-3,7,ll-trimethyl-2-cis/£ra/is-dodecenoate with tritium by methylation of the acids with diazomethane in the presence of carrier-free tritium water and the hydrogenation of 10,ll-Epoxy-6,7-cis-2,3-fraras/ c£s-farnesyl propynyl ether with titrium gas gave high spec, radioactivities (3.7; 0.49 and 25 Ci/ mMol). The strong binding of these hormones to the haemolymph proteins of white newly moulted and of colored larvae was demonstrated by gelfiltration with sephadex G-25. The disc-electrophoretic identification of the carrier proteins in the haemolymph of colored larvae showed that the hormones are approximately total bound by the hormone binding factor of a lipoprotein band. In the haemolymph of white newly moulted larvae there is a second hormone binding band beside the lipoprotein band with similar binding capacity. Seit 1961 ist die Juvenilhormonaktivität von Farnesolderivaten bekanntVon Farnesol aus-gehend synthetisierten LAW und Mitarb. 2 den 6.10-Dihydro-7.11-dichlorfarnesensäure-Methylester und BOWERS, THOMPSEN und UEBEL 3 die analogen 6.7-und 10.11-Epoxyester bzw. den 10.11-Epoxyfarne-sylmethyläther. Überraschenderweise erwiesen sich die beiden natürlichen Hormone, die aus Wildseiden-spinner von der Arbeitsgruppe ROLLER 4 und von MEYER und SCHNEIDERMAN 5 isoliert und identifi-ziert wurden, dem 10.11-Epoxyfarnesensäure-Me-thylester von BOWERS sehr ähnlich. Die lipophilen Eigenschaften dieser Isoprenoid-derivate lassen vermuten, daß diese in der Hämo-lymphe durch Assoziation mit Protein-oder Lipo-proteinbestandteilen transportiert werden. Kürzlich berichtete CHINO 6 von einem Lipoprotein, das als Diglycerid-Carrier in der Lymphe fungiert und even-tuell auch für den Transport lipophiler Hormone in Frage kommt. Im folgenden wird die Synthese von [ 3 H O-Me-Sonderdruckanforderungen an K. 
  Reference    (Z. Naturforsch. 27b, 263—273 [1972]; eingegangen am 15. Juni 1970 zurückgstellt bis 2. Januar 1972) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0263 
 Volume    27 
58Author    B. JanistynRequires cookie*
 Title    Indol-3-essigsäure-induzierte Nukleotidabgabe bei gleichzeitig erhöhter Adenosin-3':5'-monophosphorsäure (c-AMP)-Synthese in Maiskoleoptilzylindern 3-Indole Acetic Acid Induced efflux of Nucleotides Concomitant with an Increased Synthesis of Adenosin-3' :5'-monophosphat (c-AMP) in Maize Coleoptile Sections  
  Reference    (Z. Naturforsch. 27b, 273—276 [1972]; eingegangen am 7. Dezember 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0273 
 Volume    27 
59Author    Enno Brinckmann, Ulrich LüttgeRequires cookie*
 Title    Vorübergehende pH-Änderungen im umgebenden Medium intakter grüner Zellen bei Beleuchtungswechsel Light-Triggered Transient Changes of the Medium pH of Intact Green Cells  
 Abstract    When light is switched on or off the pH of the medium of green cells of a large number of various plant species investigated (Elodea, Zea mays, Amaranthus caudatus, Oenothera hookeri x albicans, Mniurn undulatum, Scenedesmus obliquus) increases or decreases respectively. This ef-fect is linked with the non-cyclic photosynthetic electron flow: 1. the effect is independent of the gross ion content of the external medium, 2. green plant cells deficient in photosystem II do not show the effect, 3. addition of 2-10~ 6 M DCMU to the medium has a similar effect as switching off the light. The pH-effect is inhibited by FCCP, it is abolished in N2 , but a normal effect is observed in C02-free air. The transient changes of H®-net flux upon change of illumination are discussed in relation to both the proton pump of the thylakoid membranes of chloroplasts and to C02 fixation after the uptake of HCOs e from the external solution coupled with the release of OH 0 ions. The results are also compared to other signals of similar kinetics observed in experi-ments with intact plant cells, especially with light-triggered transients of membrane potential and ATP-level. 
  Reference    (Z. Naturforsch. 27b, 277—284 [1972]; eingegangen am 23. Juni 1971 revidiert am 11. November 1971) 
  Published    1972 
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 TEI-XML for    default:Reihe_B/27/ZNB-1972-27b-0277.pdf 
 Identifier    ZNB-1972-27b-0277 
 Volume    27 
60Author    Nikos Kokolis, Nikos Mylonas, Irmgard Ziegler, UmweltforschungM B HRequires cookie*
 Title    Pteridine and Riboflavin Patterns During Tail Regeneration in Triturus Species and the Effects of Chloramphenicol, Isoxanthopterin and Reserpine  
 Abstract    In Triturus cristatus amputation causes the reappearance of larval tetrahydrobiopterin, thus raising the ratios tetrahydrobiopterin/isoxanthopterin and tetrahydrobiopterin/riboflavin from zero to values between 3 — 5. This increase first occurs in the remaining skin and in the eyes. The increase of both ratios in the regeneration bud, beginning with the 20 th day after amputation, coincides with their drop in both other tissues. Chloramphenicol and isoxanthopterin both strongly inhibit the formation of a regeneration bud. They also block the increase of both ratios in the remaining skin and in the rudimental regenerate as well. Reserpine induces regenerative ability in Triturus vulgaris, which normally lacks this. It has a strong melanizing effect and, moreover, it causes an increase of both ratios in the regeneration bud and in the remaining skin. 
  Reference    (Z. Naturforsch. 27b, 285—291 [1972]; received May 21 1971 revised December 18 1971) 
  Published    1972 
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 Identifier    ZNB-1972-27b-0285 
 Volume    27 
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