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  • 1
    Electronic Resource
    Electronic Resource
    Nucleoproteins. (1961)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 83 (1961), S. 1267-1268 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01466a077
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanism of Clot Lysis (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 624-625 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I wish to report here some attempts made to distinguish a true fibrinolytic enzyme from other proteolytic enzymes which can also dissolve clots. Fibrinolytic activity as defined by the ability of a substance to dissolve a clot is measured by noting the time required to dissolve a standard fibrin ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185624a0
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of Antitumour Action of 1-Amino- Cyclo pentane Carboxylic Acid (1962)
    [s.l.] : Nature Publishing Group
    Nature 194 (1962), S. 1082-1083 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Steinberg et al.5 and many other workers6-7 previously demonstrated that synthetically prepared amino-acid analogues like the ammo-acids themselves could be incorporated into proteins and they can thus compete with the natural ammo -acids for the latter's incorporation into proteins. That ACPC ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1941082a0
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  • 4
    Electronic Resource
    Electronic Resource
    Catalysis of Incorporation of 14 C-Uridine into Rat Lens Ribonucleic Acid by Rat Lens Enzyme System (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1094-1095 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rats 6-8 weeks old and weighing approximately 100-120 gm. each were given intraperitoneal injections of 0-2 ml. of 2-14C-uridine (specific activity 2-2 x 106 c.p.m.) prepared in normal saline. The animals were killed at different time-intervals after injection. The lenses from each rat were ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911094a0
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  • 5
    Electronic Resource
    Electronic Resource
    Role of Deoxyribonuclease in Synthesis of Deoxyribonucleic Acid (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 1205-1206 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Based on the observations that concentrations of both DNase activity and DNA are considerably higher in the liver of young rats than normally found in the same tissue of 210 months old rats, Devi et al.1,2 suggested a possible role of DNase in synthesis of DNA. The recent reports on the ability of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2001205a0
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Age on Some Aspects of the Synthesis of Ribonucleic Acid (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 474-475 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE the first successful attempt to synthesize ribo-nucleic acid (RNA) from four nncleoside triphosphates and rat liver nuclei which served as the source of UNA polymerase1, many investigators have studied the nature of the deoxyribonueleic acid (DNA) primer (two-stranded or single-stranded DNA) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212474a0
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  • 7
    Electronic Resource
    Electronic Resource
    Electrochemistry of zinc corrosion in dental amalgams (1988)
    Springer
    Journal of materials science 7 (1988), S. 738-740 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722085
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanism of β1 formation in conventional dental amalgams (1995)
    Springer
    Journal of materials science 6 (1995), S. 552-556 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract This study reexamined the mechanism of β1 formation in conventional dental amalgams in the light of a previously unrecognized intergranular structure, the SnHg-δ2 phase. Two amalgams, A (45. 5% Hg) and B (65. 0% Hg), were made from a Zn-free alloy of the following composition (wt%): Ag-70, Sn-26, Cu-4. After storage at 37°C for 1 day, both amalgams were heat treated at 70°C for up to 16 days. The structural changes in the two amalgams as a function of their heat treatment were characterized by differential scanning calorimetry and X-ray diffraction techniques. On the basis of the experimental data, we have proposed a new mechanism on β1 formation. This mechanism involves a series of interrelated reactions. The primary one is a reaction between AgSn-γ and δ2 that leads to the nucleation of β1 at γ boundaries. Simultaneous operation of several secondary and tertiary reactions result in (1) further growth of β1 and its continuing change in composition, (2) loss of Sn from the δ1 matrix, (3) conversion of CuHg into η, and (4) a possible transformation of δ2 into Sn-rich β1 or α1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151038
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  • 9
    Electronic Resource
    Electronic Resource
    Intergranular structure in dental amalgams (1994)
    Springer
    Journal of materials science 5 (1994), S. 171-175 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: The existence of an intergranular precipitate that provides a structural basis of creep, intergranular corrosion and thermal instability in dental amalgams has been in dispute. Also in dispute is a related matter concerning the solid solubility of Sn in ϒ1. Both these aspects have been examined in this differential scanning calorimetry (DSC) study using the following materials: (a) a conventional ϒ2−containing amalgam, (b) six ϒ2−free amalgams, and (c) a series of ϒ1 specimens with up to 4 wt% Sn. It has been observed that the solid solubility of Sn in ϒ1 is about 1.0 wt%. Above this Sn concentration, an intergranular precipitate, identified as the δ2 phase of the SnHg system, appears in ϒ1. This phase is characterized by a low melting temperature (∼90°C). The existence of this phase in the conventional dental amalgam has been confirmed. It has been observed further that the ϒ2−free dental amalgams, depending on their nature and Hg contents, may contain δ2 either as a transient or a permanent phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00053339
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  • 10
    Electronic Resource
    Electronic Resource
    The matrix phase of a ductile dental amalgam (1995)
    Springer
    Journal of materials science 6 (1995), S. 373-376 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: In this study, the ternary HgAgSn-γ1 matrix of a ductile dental amalgam has been characterized and compared with that of a brittle amalgam. Specimens of both amalgams were prepared form commercial alloy powders according to the ADA specification 1, stored at 37°C and studied by differential scanning calorimetry technique at timed intervals up to 1 year. Experimental amalgams of AgCu eutectic admixed with varying concentrations of Sn were used as standards. The matrix of the ductile amalgam was found to contain two substructures initially. One was saturated with Sn and the other contained lesser amounts of Sn. These substructures disappeared with time leading to a matrix in which Sn was well below its saturation limit but uniformly distributed. The matrix of the brittle amalgam, on the other hand, was saturated with Sn during the entire period of this study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120276
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