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  • 1
    Electronic Resource
    Electronic Resource
    Structure of adenovirus chromatin
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Gene Structure and Expression 696 (1982), S. 76-86 
    Details
    ISSN: 0167-4781
    Keywords: (Adenovirus) ; Chromatin ; Electron microscopy ; Nuclease digestion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-4781(82)90012-4
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  • 2
    Electronic Resource
    Electronic Resource
    Bradyrhizobium japonicum mutants defective in root-nodule bacteroid development and nitrogen fixation (1986)
    Springer
    Archives of microbiology 144 (1986), S. 355-366 
    Details
    ISSN: 1432-072X
    Keywords: Bradyrhizobium ; Electron microscopy ; Mutants ; Nitrogen fixation ; Nodulation ; Soybean ; Symbiosis ; Transposon Tn5
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genome of the slow-growing Bradyrhizobium japonicum (strain 110) was mutagenized with transposon Tn5. A total of 1623 kanamycin/streptomycin resistant derivatives were screened in soybean infection tests for nodulation (Nod) and symbiotic nitrogen fixation (Fix). In this report we describe 14 strains possessing a stable, reproducible Nod+Fix- phenotype. These strains were also grown under microaerobic culture conditions to test them for free-living nitrogen fixation activity (Nif). In addition to strains having reduced Fix and Nif activities, there were also strains that had reduced symbiotic Fix activity but were Nif+ ex planta. Analysis of the genomic structure revealed that the majority of the strains had a single Tn5 insertion without any further apparent physical alteration. A few strains had additional insertions (by Tn5 or IS50), or a deletion, or had cointegrated part of the vector used for Tn5 mutagenesis. One of the insertions was found in a known nif gene (nifD) whereas all other mutations seem to affect different, hitherto unknown genes or operons. Several mutant strains had an altered nodulation phenotype, inducing numerous, small, widely distributed nodules. Light and electron microscopy revealed that most of these mutants were defective in different stages of bacteroid development and/or bacteroid persistence. The protein patterns of the mutants were inspected by two-dimensional gel electrophoresis after labelling microaerobic cultures with l-(35S)methionine. Of particular interest were mutants lacking a group of proteins the synthesis of which was known to be under oxygen control. Such strains can be regarded as potential regulatory mutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409885
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  • 3
    Electronic Resource
    Electronic Resource
    Die Addition von Oxalessigester an 2,4; 3,5-Di-O-benzyliden-al-D-xylose, Ein neuer Weg zur Synthese von 2-Desoxy-heptosen (1974)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 13-18 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Addition von Oxalessigester an 2,4; 3,5-Di-O-benzyliden-al-D-xylose 1 führt zum 3-Äthoxycarbonyl-3-desoxy-5,7; 6,8-di-O-benzyliden-D-gulo-oktulosonsäure-äthylester 2, aus dem man durch Erwärmen mit verd. Salzsäure in Dioxan die 2-Desoxy-D-gulo-heptose 3 erhält. Beim Schütteln mit konz. Salzsäure und Benzylmercaptan entsteht aus 3 unter Abspaltung von Wasser das [2-Hydroxymethyl-furanyl(5)]-acetaldehyd-dibenzylmercaptal 6. Der Ketosäureester 2 kann in einer Keto-(2 a) und in einer Enol-Form 2 b auftreten. Von letzterer leiten sich das 2,4-Di-O-acetat 4 und der 2,4-Di-O-methyläther 5 ab. Die D-gulo-Konfiguration der Verbindungen 2, 3, 4 und 5 wird durch Überführen des Methyläthers 5 in den O-Methyl-L-äpfelsäure-bis-(p-bromphenacylester) 10 bewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19743160103
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  • 4
    Electronic Resource
    Electronic Resource
    Photochemie in der Vitamin D-Reihe. I. Kinetik und Quantenausbeuten der Ergosterinbestrahlung bei λ = 253,7 nm (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 921-937 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Irradiation of Δ5,7-9α, 10β-steroids in solution with λ = 253,7 nm yielded no Δ5,7-9β, 10α-steroids and vice versa. No back reaction from precalciferol2 to ergosterol could be detected by kinetic measurements. This leads to the conclusion that with the mercury resonance line only ring opening and 6,7-cis/trans isomerization but no ring closure occurs.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550319
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  • 5
    Electronic Resource
    Electronic Resource
    Die Elektronenzustände von Perimeter-π-Systemen. II. Das Elektronenspektrum des trans-15, 16-Dimethyl-dihydropyrens (1967)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 50 (1967), S. 68-84 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electronic spectrum and the polarisation of the transitions have been determined in the region from 15000 to 50000 cm-1 for the 2-acetamino derivative of trans-15, 16-dimethyl-dihydropyrene, whose spectrum resembles closely that of the parent compound and its di-ethyl analogue. It is shown that the sequence of states is 1Lb, 1La, 1Bb, 1Ba, in agreement with theoretical predictions which were deduced from a configuration interaction model for the D2h-π-perimeter of these systems. The influence of inductive and hyperconjugative effects on the band positions and the band intensities has been discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19670500112
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  • 6
    Electronic Resource
    Electronic Resource
    Die Electronenzustände von Perimeter-π-Systemen: III. Das Elektronenspektrum des 1,6-Methano-[11] annulenium-Kations (1968)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 51 (1968), S. 225-240 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electronic spectra and the polarisation of the transitions have been determined for the 1,6-methano-[11] annulenium cation III and the 4,6-dimethyl-1,2-benzotropylium cation IV. The observed sequence of polarisation of the prominent bands corresponding to the lowest electronically excited states is in agreement with the predictions derived from molecular orbital models of the PARISER-PARR-POPLE type. The influence of partial conjugation between the bridged centre and of the inductive effect of the methylene group in III has been investigated.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19680510128
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  • 7
    Electronic Resource
    Electronic Resource
    Kapillar-gaschromatographische Untersuchungen an homo- und codimeren C5-Dienen. -Einige Zusammenhänge zwischen Retentionsverhalten und Struktur bzw. KonfigurationErweiterte Fassung eines auf der Chemiedozenten-Tagung der Chemischen Gesellschaft der DDR am 28. Mai 1970 in Leipzig gehaltenen Vortrages. (1971)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 1081-1091 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Retentionsindices und ΔI-Werte von 59 Kohlenwasserstoffen verschiedener Ringsysteme, die in entsprechenden Fraktionen flüssiger Crackprodukte der Äthylenerzeugung vorkommen bzw. bei der thermischen Homo- und Codimierisierung der darin enthaltenen cyclischen und acyclischen Diene entstehen, wurden bei 60° an Kapillarsäulen mit Squalan und Polypropylenglykol 425 vermessen. Die Ergebnisse werden mitgeteilt und Zusammenhänge zwischen Kohlenwasserstoffstruktur und ΔI-Werten diskutiert.Für die untersuchten endo- und exo-Norbornene wird an Hand der ΔI-Werte gezeigt, daß eine Epimerenzuordnung mit Hilfe der Kapillar-Gaschromatographie möglich ist.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19713130612
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  • 8
    Electronic Resource
    Electronic Resource
    Foreword (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 3 (1989), S. i 
    Details
    ISSN: 0268-2605
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590030102
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  • 9
    Electronic Resource
    Electronic Resource
    Interactions of Tin(IV) and monomethyltin cation in estuarine water-sediment slurries from the great bay estuary, New Hampshire, USA (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 9 (1995), S. 581-590 
    Details
    ISSN: 0268-2605
    Keywords: inorganic tin ; monomethyltin cation ; model studies ; salt marsh ; sediment ; Spartina alterniflora ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This study describes experiments on sedimentestuarine water slurries originating from a Spartina alterniflora salt marsh. We investigated the fate of tin(IV) or monomethyltin cation (MeSn3+) chlorides after their additon to slurries under anaerobic and aerobic conditions. We did not observe methylation of tin in anaerobic or aerobic slurries with and without added tin(IV). MeSn3+-amended samples occasionally formed small amounts of Me2Sn2+ or Me3Sn+ after extended periods of time, particularly when MeSn3+ remained in solution. The stability of MeSn3+ in slurries demonstrates that the absence of net methylation of tin(IV) is not due to rapid demethylation of MeSn3+ or its further methylation. Inorganic tin concentrations in the aqueous phase of anaerobic slurries spiked with MeSn3+ and unspiked slurries decreased by about 85% in 21 days and remained relatively constant until the end of the 59-day experiments. In similar anaerobic experiments about 25% of the MeSn3+ spike was adsorbed to sediment within 1 h and about 75% was adsorbed within 10 days. The lack of methylation and demethylation reactions in our aerobic and anaerobic slurries, which contrasts with two previous reports, undoubtedly reflects the absence of added nutrients and low concentrations of added tin(IV) in our experiments. We believe that our model experiments more accurately reflect conditions in salt marshes than do previous studies. We conclude that future model studies on methylation of inorganic tin should include. S. alterniflora because it is so prominent in observations of methyltin compounds in the estuary.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590090713
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