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  • Articles  (31)
  • Articles: DFG German National Licenses  (31)
  • 1995-1999  (5)
  • 1975-1979  (25)
  • 1935-1939  (1)
  • Chemistry and Pharmacology  (31)
  • 1
    Electronic Resource
    Electronic Resource
    The structure of Q* nucleoside isolated from rabbit liver transfer ribonucleic acid (1976)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 5044-5046 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00432a071
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  • 2
    Electronic Resource
    Electronic Resource
    Hexaethyl (3,5-Di-tert-butyl-4-hydroxyphenyl)methanetrisphosphonate at 173 K (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 274-277 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270194009376
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Analyse nuklearer Rohmaterialien. XIV (1976)
    Springer
    Microchimica acta 65 (1976), S. 503-512 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Analytical scheme for the determination of ppm-amounts of uranium, thorium, iron, vanadium, copper, barium, and strontium as well as mgamounts of iron in rocks is described. In this procedure the rock sample is decomposed by means of perchloric acid-hydrofluoric acid mixture and then the uranium, thorium, vanadium, copper and iron are separated from the accompanying elements by means of the anion exchanger Dowex 1-X8. The elements are determined in the corresponding eluates by applying fluorimetry (uranium), atomic absorption spectrophotometry (vanadium, copper, iron). The determination of barium and strontium is conducted by atomic absorption-spectrophotometry following alkaline decomposition of the rock sample. The method was used for the determination of the named elements in standard rock samples, numerous rocks coming from Carinthia and Tyrol and those originating in Hawai (Molokai).
    Notes: Zusammenfassung Ein Analysenschema zur Bestimmung von ppm-Mengen Uran, Thorium, Vanadin, Kupfer, Barium und Strontium sowie mg-Mengen Eisen in Gesteinen wurde beschrieben. Bei dieser Methode wird die Gesteinsprobe mittels Perchlorsäure-Flußsäure aufgeschlossen; danach werden Uran, Thorium, Vanadin, Kupfer und Eisen mittels Anionenaustausches auf Dowex 1-X8 von den Begleitelementen getrennt. In den entsprechenden Eluaten werden die Elemente unter Anwendung von Fluorometrie (Uran), Spektralphotometrie (Thorium) und Atomabsorptionsspektrophotometrie (Vanadin, Kupfer und Eisen) bestimmt. Die Bestimmung von Barium und Strontium erfolgt auf atomabsorptionsspektrophotometrischem Weg nach alkalischem Aufschluß der Gesteinsprobe. Die Methode wurde zur Bestimmung der genannten Elemente in Standardgesteinsproben, zahlreichen Gesteinen aus Kärnten-Osttirol und solchen aus Hawai (Molokai) herangezogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01218283
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Analyse nuklearer Rohmaterialien. IX (1975)
    Springer
    Microchimica acta 64 (1975), S. 569-579 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method is described for the separation ofμg-amounts of copper from large amounts of uranium and of making the end-determination accessible by means of atomic absorption spectrophotometry. The separation of the copper from uranium and from other foreign ions present in the uranium matrix is brought about through adsorption of the copper on a column of the strongly basic anionexchanger Dowex 1, X8 from a mixture that consists of 90 vol.% methanol and 10 vol.% hydrobromic acid. After the adsorbed copper is eluted by means of 3M hydrochloric acid the copper is determined by the atomic-absorption-spectrophotometric procedure. The method was applied for the determination of copper in standard specimens of U3O8 (1 to 11 p. p. m. Cu) and Yellow Cake (4 to 25 p. p. m. Cu).
    Notes: Zusammenfassung Eine Methode wurde beschrieben, um μg-Mengen Kupfer von großen Mengen Uran zu trennen und der Endbestimmung mittels Atomabsorptionsspektrophotometrie zugänglich zu machen. Die Abtrennung des Kupfers von Uran und anderen in der Uranmatrix anwesenden Fremdionen erfolgt durch Adsorption des Kupfers auf einer Säule des stark basischen Anionenaustauschers Dowex 1, X8 aus einer Mischung bestehend aus 90 Vol.% Methanol und 10 Vol.% 1,5-m Bromwasserstoffsäure. Nach Elution des adsorbierten Kupfers mittels 3-m Salzsäure wird dieses atomabsorptionsspektrophotometrisch bestimmt. Die Methode wurde zur Bestimmung von Kupfer in U3O8-Standardproben (l bis 11 p. p. m. Cu) und Yellow-Cake-Proben (4 bis 25 p. p. m. Cu) herangezogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01219228
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  • 5
    Electronic Resource
    Electronic Resource
    Beiträge zur Analyse nuklearer Rohmaterialien. XI (1976)
    Springer
    Microchimica acta 65 (1976), S. 263-266 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The previously described method for the atomic absorption spectrophotometric determination of copper was modified somewhat and then employed for the determination of this element in radioactive ores (60 to 99 ppm Cu) and in geochemical standard samples (6 to 70 ppm Cu).
    Notes: Zusammenfassung Die früher beschriebene Methode zur atomabsorptionsspektrophotometrischen Bestimmung des Kupfers wurde etwas modifiziert und zur Bestimmung dieses Elementes in radioaktiven Erzen (60 bis 99 ppm Cu) und geochemischen Standardproben (6 bis 70 ppm Cu) herangezogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01217833
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  • 6
    Electronic Resource
    Electronic Resource
    Beiträge zur Analyse nuklearer Rohmaterialien. VIII (1975)
    Springer
    Microchimica acta 64 (1975), S. 413-424 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A procedure is described for the separation of μg quantities of lead from large amounts of uranium and for making accessible an end-determination by means of atomic absorption spectrophotometry. The separation of the lead from the uranium and from other foreign ions present in the uranium matrix is accomplished by adsorption on a column of the strongly basic anion exchanger Dowex 1, X8 from 2M hydrobromic acid. Following elution of the adsorbed lead by means of 6M hydrochloric acid, the lead is determined either by means of atomic absorption spectrophotometry or by spectrophotometry with employment of the dithizone method. The procedure was employed for the determination of lead in standard specimens of U3O8 (0.17 to 1.8 p. p. m. Pb) and of Yellow Cake (7.8 to 88 p. p. m. Pb). A good agreement of the results was attained in all cases.
    Notes: Zusammenfassung Eine Methode wurde beschrieben, umμg-Mengen Blei von großen Mengen Uran zu trennen und der Endbestimmung mittels Atomabsorptionsspektrophotometrie zugänglich zu machen. Die Abtrennung des Bleis von Uran und anderen in der Uranmatrix anwesenden Fremdionen erfolgt durch Adsorption auf einer Säule des stark basischen Anionenaustauschers Dowex 1, X8 aus 2-m Bromwasserstoffsäure. Nach Elution des adsorbierten Bleis mittels 6-m Salzsäure wird es atomabsorptionsspektrophotometrisch oder auch spektrophotometrisch unter Anwendung der Dithizonmethode bestimmt. Die Methode wurde zur Bestimmung von Blei in U3O8-Standardproben (0,17 bis 1,8 p. p. m. Pb) und Yellow-Cake-Proben (7,8 bis 88 p. p. m. Pb) herangezogen. In allen Fällen wurde eine gute Übereinstimmung der Resultate erzielt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01219207
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  • 7
    Electronic Resource
    Electronic Resource
    Anti-Pr cold agglutinins recognize immunodominant α2,3- or α2,6-sialyl groups on glycophorins (1995)
    Springer
    Glycoconjugate journal 12 (1995), S. 714-720 
    Details
    ISSN: 1573-4986
    Keywords: Anti-Pr cold agglutinins ; sialidase ; sialyltransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Anti-Pr cold agglutinins (CAs) with the subspecificities anti-Pr1h,-Pr1d, -Pr2, -Pr3h, -Pr3d, -PrM and anti-Sa CAs recognize immunodominantN-acetylneuraminic acid (NeuN Ac) groups of tetra and/or trisaccharides (O-glycans) of glycophorin. These O-glycans are sialylated in α2,3- and/or α2,6-linkages. Sa and most Pr antigens have been inactivated by α2,3-specific sialidases. Antigenicity was reconstituted on desialylated glycophorin by α2,3-specific Galβ1,3GalN Ac-sialyltransferase indicating that α2,3-linked NeuN Ac groups are the immunodominant components of Sa and most Pr antigens. Some Pr antigens were resistant to α2,3-specific sialidase and were not reconstituted by α2,3-specific Galβ1,3GalN Ac-sialyltransferase, which indicates that α2,6-linked NeuN Ac group represents an immunodominant component of some Pr antigens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731269
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  • 8
    Electronic Resource
    Electronic Resource
    Enzymatic transfer of sialic acids modified at C-5 employing four different sialyltransferases (1995)
    Springer
    Glycoconjugate journal 12 (1995), S. 739-746 
    Details
    ISSN: 1573-4986
    Keywords: sialic acid analogues ; CMP-glycosides ; sialyltransferases ; resialylation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract We present kinetic studies on the enzymatic transfer of several synthetic sialic acid analogues, modified at C-5, to distinct glycoprotein glycans by sialytransferases differing in acceptor- and linkage-specificity. Biochemical properties of sialic acids were modified by introducing formyl-, trifluoroacetyl-, benzyloxycarbonyl-, and aminoacetyl-groups to the amino group at C-5 of neuraminic acid. The latter substitution renders the corresponding α-glyocoside resistant towards sialidases. The respective CMP-sialic acid analogues were prepared by CMP-sialic acid synthase with a yield of 13–55%. The kinetic parameters of several sialyltransferases for the 5-substituted CMP-glycosides differed significantly. Relative to parent CMP-NeuAc, reaction rates of human- and rat liver Galβ1, 4GlcNAc α2,6-sialyl-transferases ranged from 50 to 170%, of GalNAc α2,6-sialyltransferases from 40–140%, and of Galβ1,3Gal-NAc α2,3-sialyltransferase from 20–50%. Resialylation of asialo-α1-acid glycoprotein by 5-N-formyl- and 5-N-aminoacetyl-neuraminic acid employing rat liver Galβ1,4GlcNAc α2,6-sialyltransferase proceeded to about 80% of galactose sites which is identical to the extent achieved with parent NeuAc. According to our data, neosialoglycoconjugates which carry sialic acids modified at theN-acetyl group can be prepared for structure-function analysis, as this position seems crucial for recognition of adhesion proteins and influenza viruses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00731233
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  • 9
    Electronic Resource
    Electronic Resource
    Kairomones and their use for management of entomophagous insects: III. Stimulation ofTrichogramma achaeae,T. pretiosum, andMicroplitis croceipes with host-seeking stimuli at time of release to improve their efficiency (1975)
    Springer
    Journal of chemical ecology 1 (1975), S. 431-438 
    Details
    ISSN: 1573-1561
    Keywords: kairomones ; Trichogramma achaeae ; Trichogramma pretiosum ; Microplitis croceipes ; Heliothis Spp. ; host-seeking stimuli ; insect behavior ; releasers ; pest management ; biological control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Frass from larvae of the corn earworm,Heliothis zea (Boddie) and scales fromH. zea moths (that are known to contain the host-seeking stimulus, tricosane) stimulate and orient host-seeking activity in femaleMicroplitis croceipes (Cresson), a larval parasite ofH. zea, andTrichogramma spp., egg parasites ofH. zea. When larval frass, moth scales, and tricosane were used as sign stimuli (releasers) forM. croceipes, T. pretiosum (Riley), andT. achaeae Nagaraji and Nagarkatti, respectively, at time of their release from laboratory containers, parasite performance improved, resulting in significantly increased rates of parasitization over that of unstimulated parasites. Stimulation ofM. croceipes with larval frass had an overriding effect on this parasite's innate tendency to disperse upon release, thereby increasing the numbers remaining and prolonging their retention in the target area. Supplying the appropriate host-seeking stimuli to these 3 hymenopterous parasites ofH. zea at time of their release to improve their efficiency greatly increases the probability of their effective utilization in pest management systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988584
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  • 10
    Electronic Resource
    Electronic Resource
    Kairomones and their use for management of entomophagous insects: II. Mechanisms causing increase in rate of parasitization byTrichogramma spp. (1975)
    Springer
    Journal of chemical ecology 1 (1975), S. 349-360 
    Details
    ISSN: 1573-1561
    Keywords: Trichogramma achaeae ; Heliothis zea ; biological control ; kairomones ; pest management ; parasitoids ; host finding ; insect behavior ; pheromones ; behavior chemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract When the effect of the kairomone, tricosane, on parasitization byTrichogramma achaeae Nagaraja and Nagarkatti of eggs ofHeliothis zea (Boddie) was studied in petri dish tests, the greatest percentage parasitization ( $$\mathop X\limits^\_$$ = 64%) was obtained if the entire filter paper was treated. Treatment of smaller areas (about the eggs) resulted in decreased parasitism. In the greenhouse, highest parasitization ( $$\mathop X\limits^\_$$ = 71%) byT. pretiosum (Riley) ofH. zea eggs placed on pea seedlings grown in pie pans was obtained if the whole pan was treated; lowest parasitism ( $$\mathop X\limits^\_$$ = 29%) occurred when the pans were untreated. Parasitization was intermediate ( $$\mathop X\limits^\_$$ = 52%) in other pans treated only at selected spots. Dissections ofH. zea eggs collected from kairomonetreated and untreated field plots revealed that eggs ofTrichogramma spp. were more efficiently distributed (less superparasitism) among host eggs in treated plots. These kairomones increase parasitization ofTrichogramma spp. by releasing and continuously reinforcing an intensified searching behavior rather than by attracting and guiding the parasite directly to the host.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988837
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