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  • Springer  (82)
  • Nature Publishing Group  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Electricity harnessed (1979)
    [s.l.] : Nature Publishing Group
    Nature 282 (1979), S. 763-763 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THIS is a very welcome book - for what it provides, what it suggests and what it makes possible. What it provides is a classification scheme and history of frictional electrostatic machines, devices which constituted the first important electrical invention. Together with the Leyden jar, they made ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/282763b0
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  • 2
    Electronic Resource
    Electronic Resource
    Sites of inhibition of in vitro DNA synthesis in carcinogen- and UV-treated Φ174 DNA (1979)
    [s.l.] : Nature Publishing Group
    Nature 278 (1979), S. 664-666 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Polyacrylamide gel analysis of the product synthesized by poll on a DNA template reacted with AAAF. Single-stranded phage F?174 DNA ^Oi^gmr1) was reacted with 14C-AAAF(50 g ml 1) for 4 h at 30 C, extracted 4 times with amyl alcohol, precipitated with ethanol and resuspended in lOmM Tris-HCl ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/278664a0
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of ribothymidine in specific eukaryotic tRNAs on their efficiency in in vitro protein synthesis (1976)
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 159-162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The existence of a class of tRNAs containing an unmodified uridine in place of rT is especially significant in view of the evidence suggesting that rT and the tetranucleotide in which it is located are involved directly in the role of a tRNA in protein biosynthesis716. Using a crude rT-forming ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/261159a0
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of Collagen on Polyribosomes (1964)
    [s.l.] : Nature Publishing Group
    Nature 202 (1964), S. 438-441 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT has been shown in several animal, microbial and plant systems that the assembly of polypeptide chains during protein synthesis occurs on clusters of ribosomes called 'polyribosomes' or simply 'polysomes'1-4. These poly somes appear to be held together by messenger RNA. They are usually ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/202438a0
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  • 5
    Electronic Resource
    Electronic Resource
    Specificity of the Mutagenic Action of the Alkylating Agents (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 730-731 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Freese accounts for the specificity of the ethyl derivative by supposing that both ethyl and methyl methanesulphonates combine with guanine residues within the deoxyribonucleic acid (DNA), but that only the ethylated guanine breaks down to form an apurinic acid at an appreciable rate. The apurinic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/191730a0
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  • 6
    Electronic Resource
    Electronic Resource
    On the distribution of the time required to remove white balls from an URN (1985)
    Springer
    Bulletin of mathematical biology 47 (1985), S. 791-797 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Balls are removed one-at-a-time at equal time intervals from an urn initially containingw 0 white balls and a large number b of black balls and each black or white ball is immediately replaced by a black ball. The distribution of the number of white balls remaining aftert iterations (under certain limiting operations) is taken from the literature. The problem is to use this result to find the time required to remove a fixed number of white ballsw 1 from the urn. We then find the mean and variance of this distribution and also look at the special case whenw 1 =w 0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02469306
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  • 7
    Electronic Resource
    Electronic Resource
    Mathematical studies of the interaction of respiratory gases with whole blood I. O2 absorption (1960)
    Springer
    Bulletin of mathematical biology 22 (1960), S. 391-415 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Some progress has been made on the problem of the interaction of respiratory gases with whole blood. A practical working model for oxygen absorption in and interaction with whole blood is developed by assuming that oxygen molecules compete with protons for binding sites on the hemoglobin molecule and by invoking the Wyman-Allen (Jour. of Polymer Science,5, 499–518, 1951) hypothesis that two oxygen molecules go on the hemoglobin at one time. Extensive tests of this model against saturation measurements on blood from humans, horses, oxen and sheep are made. Values for the equilibrium constants are calculated and compared. In addition a second working model has been developed in an attempt to explain why O2 saturation measurements when expressed as (100 percent — percent saturation) are an exponential function of oxygen partial pressure. Considerations which make plausible the following expression for saturation, [1−2e −γx/h1/2/(1+(1/20)(β′/h 1/2+h 1/2/β′))] are presented. Herex denotes oxygen tension,h denotes hydrogen ion concentration and β′ and γ are parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476722
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  • 8
    Electronic Resource
    Electronic Resource
    Mathematical studies of the interaction of respiratory gases with whole blood II. CO2 absorption (1961)
    Springer
    Bulletin of mathematical biology 23 (1961), S. 1-14 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Some progress has been made on the problem of the interaction of respiratory gases with whole blood. A working mathematical model for the O2−CO2 interaction phenomena has been developed from mathematical studies of the data. The Edsall-Wyman (1958) model for CO2 absorption is improved upon in this paper by consolidating it with the O2 absorption model developed in paper I of this set (Bernard, S. R.,Bull. Math. Biophysics,22, 391–415, 1960). This improved model assumed the effect of O2 on CO2 absorption is mediated through the electrical charge possessed by the hemoglobin molecule,i.e., O2 molecules bound to hemoglobin displace protons from the hemoglobin thereby increasing the negative charge on the hemoglobin and at the same time increasing the acidity of the solution. The model is tested against the data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02476569
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  • 9
    Electronic Resource
    Electronic Resource
    Study of age dependent half-life of iodine in man: A reinforcement-depletion urn model (1985)
    Springer
    Bulletin of mathematical biology 47 (1985), S. 205-213 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An urn contains balls ofs different colors. The problem of the reinforcement of a specified color and random depletion of balls has been considered by Shenton (1981, 1983). In this paper, the theory is applied to the biological age dependent half-life of radioactive iodine in man; the data of Cook and Snyder (1965) is used. The intake of radioactive iodine and its retention subsequently is studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460031
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  • 10
    Electronic Resource
    Electronic Resource
    Book review (1982)
    Springer
    Bulletin of mathematical biology 44 (1982), S. 151-151 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459426
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