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  • 1
    Series available for loan
    Series available for loan
    Ottawa
    Associated volumes
    Call number: SR 90.0009(271)
    In: Memoir
    Type of Medium: Series available for loan
    Pages: V, 55 S. + 2 Kt.-Beil.
    Series Statement: Memoir / Geological Survey of Canada 271
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1432-2242
    Keywords: Mutator ; Autonomous elements ; Mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Previous studies of stocks of two Mutator-induced mutable a1 alleles (a1-Mum2 and al-Mum3) gave results consistent with the presence of one or more autonomous elements regulating the expression of mutability. This article reports on the results of studies designed to map these autonomous elements by using a series of waxy marked translocations. Linkage of waxy with autonomous elements was found for a1-Mum2 by using the translocations wx T2-9d, wx T4-9e and wx T4-9b. Several different linkage values were found in crosses involving wx T2-9d, suggesting that autonomous elements have transposed to different locations on chromosome 2. Linkage of autonomous elements with waxy was found for a1-Mum3 using translocation wx T2-9d. Again, several different linkage values were found. Some of these values were the same as those observed for a1-Mum2, but some were unique. In some crosses, the number of autonomous elements increased by one or two unlinked elements in addition to the linked element in one generation (i. e. the generation of the cross to the translocation series). Such an increase in number is probably the result of transposition of the original autonomous element to an independent locus while retaining the autonomous element at the original locus. Reduction in the number of autonomous elements is probably the result of the independent assortment in crosses of plants with two or more autonomous elements.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 424-427 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At the time of the MERIT, intensive campaign, the IRIS (international radio interferometric surveying4) project was already operating 24-h VLBI observing sessions every 5 days to monitor polar motion and ?t?. To determine ?t? on the intervening 4 days, 1-h observing sessions were scheduled each day ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 310 (1984), S. 572-574 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations reported here were collected under the aegis of projects MERIT7 (Monitor Earth Rotation and Intercompare the Techniques of observation and analysis), POLARIS8'9 (POLar-motion Analysis by Radio Interferometric Surveying), and IRIS10 (International Radio Interferometric Surveying). ...
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-9309
    Keywords: Carbon dioxide ; crustal penetration by asteroid impact ; geochemical change ; extinction ; high terrain evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract It has been established from geological studies that change in the atmospheric content of carbon dioxide gas commenced about one hundred million years ago. The likely origin of this change is advanced as being the onset of the Brewer circulation caused by the rise in terrain induced by tectonic plate movement. It is demonstrated that tectonic plate movement can be affected by impacts from external bodies which penetrate the crust of the Earth. The consequences of the change in atmospheric concentration of carbon dioxide are proposed as first, extinctions and reductions in animal numbers, including primates, as a result of changes in body chemistry of these animals and second, a change in the rate of weathering of rocks giving rise to changes in the availability of chemicals such as calcium and potassium which are essential for plant and animal life. This latter change contributing to the extinctions and reductions in animal numbers. It is shown that the change in weathering can account for the rise to dominance of angiosperm plants. It is concluded that there were several simultaneous evolutionary environments on Earth which were a function of altitude which gave rise to a vertical variation in atmospheric content of carbon dioxide. This variation disappeared with rise of terrain and the onset of the Brewer circulation. Such changes are advanced and being much more important than any changes in temperature caused by greenhouse effects since the disappearance of atmospheric variations in carbon dioxide allowed animal migration. It is demonstrated that the conditions of extinction could be reintroduced by human activities.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Speculations in science and technology 21 (1998), S. 187-197 
    ISSN: 1573-9309
    Keywords: Carbon dioxide ; climate change ; radiant energy production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Natural Sciences in General , Technology
    Notes: Abstract The present mechanism of radiant energy production in the atmosphere is considered and it is shown that it is not compatible with accepted principles of physics. An alternative mechanism whereby the temperature of the atmosphere and surface of the Earth is regulated by a chemical reaction in the stratosphere is described. It is shown that this mechanism can account for the changes in climate which occurred during the past ten thousand years. The effect on this mechanism of changes in the composition of atmospheric gases, including changes resulting from human activities, is described and the consequences of the changes recorded.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1617-4623
    Keywords: Transposable elements ; Mutation ; Mutator ; Maize
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The mutagenic activity of the maize transposable element system Mutator can be lost by outcrossing to standard, non-Mutator lines or by repetitive intercrossing of genetically diverse Mutator lines. Lines losing Mutator mutagenic activity in either manner retain high copy numbers (10–15 per diploid genome) of the Mutator-associated Mu transposable elements. Frequent transposition of Mu1-related elements is observed only in active Mutator lines, however. The loss of Mutator activity on intercrossing is correlated with an increase in the copy number of Mu1-like elements to 40–50 per diploid genome, implying a self-encoded or self-activated negative regulator of Mu1 transposition. The outcross loss of Mutator activity is only weakly correlated with a low Mu element copy number and may be due to the loss of a positive regulatory factor encoded by a subset of Mu1-like elements. Transposition of Mu elements in active Mutator lines generates multiple new genomic positions for about half the elements each plant generation. The appearance of Mu1-like elements in these new positions is not accompanied by equally high germinal reversion frequencies, suggesting that Mu1 may commonly transpose via a DNA replicative process.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 349 (1991), S. 768-770 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the late 1960s Shapiro4'5 recognized that VLBI measurements of the relativistic deflection of signals from extragalactic radio sources by the gravity field of the Sun could potentially yield an accurate estimate of y. The National Oceanic and Atmospheric Administration's POLARIS and IRIS ...
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The VLBI data, analysed at the National Geodetic Survey (NGS), were obtained in the MERIT short campaign and from the NGS's project POLARIS3. The MERIT data, collected during two 1-week observing sessions in September and October 1980, resulted from observations of up to five antennas operating ...
    Type of Medium: Electronic Resource
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  • 10
    Publication Date: 2019-01-25
    Keywords: PHYSICS (GENERAL)
    Type: Proc. of the 9th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 127-134
    Format: text
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