ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • GEOPHYSICS  (6)
  • SPACE SCIENCES  (5)
  • ASTRONOMY  (4)
  • Carbon dioxide  (2)
  • Mutator  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Genetic regulation of somatic mutability of two Mu-induced a1 mutants of maize (1992)
    Springer
    Theoretical and applied genetics 84 (1992), S. 225-236 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00224004
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Concomitant regulation of Mu1 transposition and Mutator activity in maize (1987)
    Springer
    Molecular genetics and genomics 208 (1987), S. 57-62 
    Details
    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
    URL: http://dx.doi.org/10.1007/BF00330422
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    A stratospheric chemical reaction controlling climatic change (1998)
    Springer
    Speculations in science and technology 21 (1998), S. 187-197 
    Details
    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
    URL: http://dx.doi.org/10.1023/A:1005416211463
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Palaeo-variations in the atmospheric concentration of carbon dioxide and the relationship to extinctions (1998)
    Springer
    Speculations in science and technology 21 (1998), S. 171-185 
    Details
    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
    URL: http://dx.doi.org/10.1023/A:1005466408465
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    facet.materialart.
    Unknown
    Quasars revisited - Rapid time variations observed via very-long-baseline interferometry (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Quasar internal kinematics and fine structure rapid time variations from radio interferometry
    Keywords: SPACE SCIENCES
    Type: ; UG REVUE(
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 6
    facet.materialart.
    Unknown
    Variations of small quasar components at 2,300 MHz (1969)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Secular variations in small quasar components, discussing compatibility with theory of expanding synchrotron sources
    Keywords: SPACE SCIENCES
    Type: ; RNIER-POST (
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 7
    facet.materialart.
    Unknown
    Comparison of earth rotation as inferred from radio interferometric, laser ranging and astrometric observations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results of measurements of the earth's rotation vector for a 400-day period from late September 1980 to December 1981, for which date from VLBI, satellite laser ranging (SLR), and lunar laser ranging (LLR) were available, are compared. The acquisition of the data and their evaluation are described. VLBI, SLR, and classical astrometric determinations of the X-parameter required to describe the location of the rotation pole on the earth's surface are shown, and VLBI, LLR, and classical astrometric determinations of the angle of rotation about this pole (UT1) are presented. The results indicate that VLBI and SLR, at their present stages of development, yield standard errors under 20 cm in the determinations of X, about twofold smaller than obtained from classical measurements, and that VLBI and LLR yield determination of UT1 with standard errors less than 40 cm, somewhat smaller than that of the corresponding determinations from classical observations. Methods for improving these types of intercomparisons are suggested.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 302; April 7
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 8
    facet.materialart.
    Unknown
    Submilliarcsecond astrometry via VLBI. I - Relative position of the radio sources 3C 345 and NRAO 512 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The relative position and relative proper motion of the radio sources 3C 345 and NRAO 512 are estimated from four sets of VLBI observations spread out over the period from October 1971 to May 1974. The use of phase-connection techniques yields the separation, in 1950.0 coordinates, of the centers of brightness of the compact components of the two sources. An upper bound of 0.0005 arcsec/yr is placed on the relative proper motion (70% estimated confidence limits). Bounds that can be placed on the distances to the two sources are considered, prospects for improvement in the determination of relative position and proper motion of these sources are discussed, and other possible applications of the basic technique are described.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 84; Oct. 197
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 9
    facet.materialart.
    Unknown
    Intense outburst /S/ of radio radiation detected with the Goldstone-Haystack interferometer. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Astrophysical Journal; 183; July 15
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 10
    facet.materialart.
    Unknown
    Transcontinental baselines and the rotation of the earth measured by radio interferometry (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Nine separate very-long-baseline interferometry experiments, carried out in 1972 and 1973 with radio telescopes 3900 kilometers apart, yielded values for the baseline length with an rms deviation about the mean of less than 20 centimeters. The corresponding fractional spread is about five parts in 100,000,000. Changes in universal time and in polar motion were also determined accurately from these data. The rms scatter of these results with respect to those based on optical methods was 2.9 msec and 1.3 m, respectively. Solid-earth tides were apparently detected, but no useful estimate of their amplitude was extracted.
    Keywords: GEOPHYSICS
    Type: Science; 186; Dec. 6
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...