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  • 1980-1984  (6)
  • 1960-1964  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Analysis of spermatogenesis in Drosophila melanogaster bearing deletions for Y-chromosome fertility genes (1981)
    Springer
    Chromosoma 83 (1981), S. 593-617 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The effects on spermatogenesis of a series of contiguous non-overlapping Y-chromosome deficiencies were examined using both the light and electron microscope. The deficiencies were constructed by combining elements of different X-Y translocations; they subdivide the Y into seven segments, six of which are required for male fertility (four in the long arm and two in the short arm). Spermatogensis was examined from the primary spermatocyte through to the formation of mature sperm and the earliest departures from normal development identified. Two deficiencies result in the absence of the same structure from the axoneme of the sperm tail-the dynein-containing outer arm extending from the A subtubule of the peripheral doublet; they also result in the absence from primary spermatocyte nuclei of aggregates of tubuli in one case and reticular material in the other. A third deficiency causes the appearance in the primary spermatocyte of the crystals characteristic of X0 males and the irregular distribution during meiosis of nuclear and cytoplasmic elements to the spermatids. The fourth deficiency results in the misalignment of the developing axoneme with the mitochondrial derivatives and is first detectable in the onion nebenkern stage of the spermatid. Finally for two deficiencies the first abnormalties detected were during later stages and comprise a syndrome found in most of the steriles. We attribute this phenotype to the indirect effects of earlier lesions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328522
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Synthetic Analgesics. IV. Synthesis of Enantiomers of Basic Anilides Containing the Phenalkyl Moiety1,2 (1963)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 6 (1963), S. 128-130 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00338a009
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Color Stability of Astaxanthin Pigmented Rainbow Trout Under Various Packaging Conditions (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 49 (1984), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Astaxanthin-rich oil extract from Louisiana crawfish by-product imparted a salmon-red coloration to the flesh and integument of rainbow trout on a diet containing 45 mg astaxanthin/kg feed. Carotenoids deposited in fish flesh were stable (ca 90% retention) in air-packed samples at 1 - 2°C. Oxygen-evacuated and CO2-enriched packaging gave adverse color stability. Lowest pigment levels were in frozen samples, with 53% of the absorbed pigment degraded in 14 days. Visual color scores were consistent with quantitative pigment analyses (r = 0.77). Higher pigment contents were observed in air-packed (1 - 2°C) samples, possibly due to astacene or other breakdown products of astaxanthin. Maximal TBA values were observed in air-packed (1 - 2°C) samples. The effect of tissue enzyme homogenate on fading of trout flesh is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1984.tb14985.x
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  • 4
    Electronic Resource
    Electronic Resource
    B-CELL SUBPOPULATIONS IDENTIFIABLE BY TWO-COLOR FLUORESCENCE ANALYSIS USING A DUAL-LASER FACS (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 399 (1982), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1982.tb25667.x
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  • 5
    Electronic Resource
    Electronic Resource
    B-cell subpopulations identified by two-colour fluorescence analysis (1982)
    [s.l.] : Nature Publishing Group
    Nature 297 (1982), S. 589-591 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The B-cell populations in BALB/c spleen (Figs 1, 2) are resolved into two subsets on the basis of the amount of IgM expressed. The predominant population (labelled I in the diagram), which has relatively little surface IgM, expresses intermediate to high levels of surface IgD and constitutes -60% ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/297589a0
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  • 6
    Electronic Resource
    Electronic Resource
    Demonstration of B-cell maturation in X-linked immunodeficient mice by simultaneous three-colour immunofluorescence (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 270-272 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] All IgM-bearing cells in the spleens of 2-week-old animals express BLA-1 (recognized by rat monoclonal antibody 53-10.1)6, whereas less than half of the IgM-bearing spleen cells in adults carry this antigen (Fig. 2). BLA-1 therefore appears to be absent from the late-developing more 'mature' ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306270a0
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  • 7
    Electronic Resource
    Electronic Resource
    Correlation between segmental flexibility and effector function of antibodies (1984)
    [s.l.] : Nature Publishing Group
    Nature 307 (1984), S. 136-140 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Mouse monoclonal anti-dansyl antibodies with the same antigen-binding sites but different heavy chain constant regions were generated. The extent of segmental flexibility in times of nanoseconds and the capacity to fix complement were greatest for IgG2b, intermediate for IgG2a, and least for IgG1 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/307136a0
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  • 8
    Electronic Resource
    Electronic Resource
    Initiation of polymerisation by irradiated polymethyl methacrylate. II. Gaseous, liquid, and emulsified monomer with pre-irradiated polymerPart I. Makromolekulare Chem. 42 (1960) 33. (1963)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 67 (1963), S. 149-156 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Geschwindigkeiten der Polymerisationen unter dem Einfluß vorbestrahlter PMMA-Filme und die Geschwindigkeiten der entsprechenden unkatalysierten Polymerisationen dieser Monomeren sind beinahe nicht unterscheidbar. Diese Beobachtung steht mit der berechneten Geschwindigkeit eines bimolekularen Zerfalles von Radikalen in mit Monomerem gequollenen Polymerfilmen in Übereinstimmung. Die Radikale verschwinden ebenfalls schnell, wenn das Monomere langsam auf die Filme destilliert wird. Fügt man das Monomere in Form einer wäßrigen Emulsion hinzu, so werden die Geschwindigkeiten von den Diffusionen des Monomeren in die Filme und von kleinen Radikalen aus den Filmen gleich, so daß ein Teil der Radikalaktivität in die Emulsion entkommt, wo er eine sehr langlebige Emulsionspolymerisation initiiert.
    Notes: The rates of polymerisation of styrene and vinyl acetate under the influence of preirradiated polymethyl methacrylate (PMMA) film are almost indistinguishable from the corresponding uncatalysed rates of these monomers. This observation is consistent with the calculated rate of bimolecular decay of radicals in a polymer film swollen with monomer. The radicals disappear rapidly even if the monomer is distilled slowly on to the film. If the monomer is added in the form of an aqueous emulsion the rates of the diffusions of the monomer into the film and of small radicals out of the film are so balanced that a proportion of the radical activity escapes into the emulsion where it initiates a very long-lived emulsion polymerisation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1963.020670114
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  • 9
    Electronic Resource
    Electronic Resource
    Initiation of polymerisation by irradiated polymethyl methacrylate. III. The kinetics of emulsion polymerisation initiated by pre-irradiated film (1963)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 67 (1963), S. 157-166 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kinetik der Emulsionspolymerisation von Styrol, die durch den Einfluß von vorbestrahlten Filmen von PMMA angeregt wurde, ist untersucht worden. Die Bruttoreaktionsgeschwindigkeit war von der Anzahl von Radikalen in den Filmen unabhängig. Nach einer Induktionszeitperiode folgte die Polymerisation einem SMITH-EWART-Fall-II-Mechanismus. Die ARRHENIUSfaktoren der Wachstumsgeschwindigkeitskonstanten waren 8-10 Kcal./Mol und 107-109 l Mol-1 sec-1. Die mittlere Aktivierungsenergie der Übertragungsreaktionen, die den Polymerisationsgrad bestimmen, war 11-13 Kcal/Mol.
    Notes: The kinetics of the emulsion polymerisation of styrene initiated by previously gammairradiated polymethyl methacrylate (PMMA) films have been investigated. The rate of polymerisation was independent of the number of radicals in the film. After an induction period the polymerisation followed a SMITH-EWART Case II mechanism. The ARRHENIUS factors for the propagation rate constant were 8-10 kcal./mole and 107-109 l./mole sec. The average activation energy of the transfer reactions which regulated the degree of polymerisation was 11-13 kcal./mole.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1963.020670115
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  • 10
    Electronic Resource
    Electronic Resource
    Applications and limitations of turbidimetric titration as a method of characterizing solutions of polymers and mixtures of polymers (1960)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 39 (1960), S. 52-66 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Anwendbarkeit der Trübungstitrationsmethode zur Analyse von Polymermischungen wurde an bekannten Mischungen untersucht. Die Methode war, wenn Mischungen von Block- oder Pfropfcopolymeren mit Homopolymeren benutzt wurden, in drei von vier Versuchen nicht einmal halbquantitativ.Elektronenmikroskopische Aufnahmen von Proben der Suspension, die während der Trübungstitrationen der Polymerlösungen entnommen wurden, zeigten, daß die Voraussetzung einer einheitlichen Teilchengröße oder einer einfachen geometrischen Teilchenform nicht gegeben ist.
    Notes: The validity of turbidimetric titration in the analysis of polymer mixtures was tested using mixtures of known composition. In some cases, which included three out of four mixtures of block or graft copolymers with homopolymers, the method was not even semiquantitative.Electron micrographs of samples of the suspension taken during titration of single polymer solutions show that assumptions of uniform size or regular geometrical shape of the particles are invalid.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1960.020390105
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