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  • 1
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Zusammenfassung Es wurde ein neues Gen der Tanzmausgruppe beschrieben mit den Symptomen Hyperaktivität, Kopfschütteln und Tanzen und Taubheit. Die Abnormalität trat bei 4 Jungen in einem Wurf freilebender wilder Hausmäuse auf, mit größter Wahrscheinlichkeit spontan. Kreuzungsversuche zeigten, daß die Abnormität durch ein rezessives Gen mit vollständiger Penetranz verursacht wird. Die neue Mutation ist nicht identisch mit v, sh-1, sh-2, je, kr, pi oder fi. English Summary. A new gene with the typical phenotype of the waltzer-shaker group is described. The name dreher, with symbol dr, is proposed. It arose, presumably by spontaneous mutation, in the wild, and was obtained in a litter of four, all of which were homozygotes, captured in a factory in Detmold, Germany. The gene is recessive and good single-factor segregations were obtained. Non-identity with v, sh-1, sh-2, je, kr, pi, and fi was proved.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 86 (1954), S. 263-268 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die Reihenfolge der total geschlechtsgebundenen Gene und ihre Rekombinationshäufigkeit in heterozygoten Weibchen ist $$B_n - 11\% - Ta - 4\% - _{Mo}^{Br} $$ \ Rough (ro) liegt in Koppelungsgruppe V, zwischen pa und Sd und sehr dicht bei pa. Die Rekombinationshäufigkeit zwischen pa und ro ist ungefähr 0,6%.
    Notes: Summary The order of the totally sex-linked genes and the recombination frequencies in heterozygous females are — $$B_n - 11\% - Ta - 4\% - \left\{ {_{Mo}^{Br} } \right\}$$ Rough (ro) is located in linkage Group V, between pa and Sd and very close to pa. Recombination frequency between pa and ro is about 0.6%.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Molecular genetics and genomics 85 (1953), S. 210-219 
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Tabby (Ta) ist ein völlig geschlechtsgebundenes Gen in der Hausmaus. In Weibchen zeigt es unvollkommene Dominanz. Männchen mit dieser Mutante gleichen homozygoten Weibchen, ein Beweis, daß das Y-Chromosom kein homologes Gen enthält. 2. Heterozygote Weibchen haben schwarze Querstreifen, die nur auf Agouti-Hintergrund erkennbar sind. Homozygote Weibchen und hemizygote Männchen zeigen eine Anzahl von Abnormitäten, die genau den von dem recessiven Autosomalfaktor crinkled hervorgerufenen gleichen. 3. Brindled und Mottled sind gleichfalls völlig geschlechtsgebunden; das geht hervor aus Koppelungsversuchen mit Weibchen, die heterozygot für Tabby und eines dieser Gene sind. Sowohl Brindled und Mottled haben Tabby gegenüber eine Rekombinationshäufigkeit von ungefähr 4%. Das beweist das Vorkommen von crossing-over in dem Differentialsegment des X-Chromosoms in Weibchen.
    Notes: Summary 1. A totally sex-linked gene, Tabby (Ta), in the house mouse is described. It is semi-dominant in females. Mutant males resemble homozygous females, which shows that there is no homologue on the Y-chromosome. 2. Heterozygous females have transverse black markings, visible only in agoutis. Homozygous females and hemizygous males have a number of defects exactly resembling those produced by the autosomal recessive crinkled. 3. Brindled and Mottled are shown also to be totally sex-linked, by means of linkage tests with Tabby in doubly heterozygous females. Both Brindled and Mottled recombine with Tabby with a frequency of about 4%. This proves that crossing-over takes place in the differential segment of the X-chromosome in females.
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  • 4
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. An experiment with mice is described which was intended to show whether the degree of sensitivity to environmental influences can be changed by selection of extreme phenotypic deviants for a metric character. 2. Body weight was taken as a metric character and opposite extremes (large × small) were selected as parents in the “extreme” line. Individuals closest to the mean were selected as parents in the “central” line. The coefficient of variation of body weight was followed through 13 generations of this selection. 3. No change of variability was detected in the extreme line. The males, but not the females, of the central line showed a small decline of variability. 4. The two lines diverged in body weight in both sexes in the second half of the experiment, the extreme line being the heavier. The cause of this difference is not known. 5. The conclusion to which the results point is that selection of extreme phenotypic deviants did not materially change the sensitivity to environmental influences. An increase in environmental variance from this cause is therefore unlikely to be an important consequence of unidirectional selection.
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  • 5
    Publication Date: 2018-06-12
    Description: We examine the magnetic causes of coronal mass ejections (CMEs) by examining, along with the correlations of active-region magnetic measures with each other, the correlations of these measures with active-region CME productivity observed in time windows of a few days, either centered on or extending forward from the day of the magnetic measurement. The measures are from 36 vector magnetograms of bipolar active regions observed within -30" of disk center by the Marshal Space Flight Center (MSFC) vector magnetograph. From each magnetogram, we extract six whole-active-region measures twice, once from the original plane-of-the-sky magnetogram and again a h r deprojection of the magnetogram to disk center. Three of the measures are alternative measures of the total nonpotentiality of the active region, two are alternative measures of the overall twist in the active-region's magnetic field, and one is a measure of the magnetic size of the active region (the active region's magnetic flux content). From the deprojected magnetograms, we find evidence that (1) magnetic twist and magnetic size are separate but comparably strong causes of active-region CME Productivity, and (2) the total free magnetic energy in an active region's magnetic field is a stronger determinant of the active region's CME productivity than is the field's overall twist (or helicity) alone. From comparison of results from the non-deprojected magnetograms with corresponding results from the deprojected magnetograms, we find evidence that (for prediction of active-region CME productivity and for further studies of active-region magnetic size as a cause of CMEs), for active regions within approx.30deg of disk center, active-region total nonpotentiality and flux content can be adequately measured from line-of-sight magnetograms, such as from SOH0 MDI.
    Keywords: Solar Physics
    Type: The Astrophysical Journal; Volume 644; 1258-1272
    Format: text
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  • 6
    Publication Date: 2018-06-12
    Description: From a sample of 17 vector magnetograms of 12 bipolar active regions we have recently found (1) that a measure of the overall nonpotentiality (the overall twist and shear in the magnetic field) of an active region is given by the strong shear length Lss, the length of the portion of the main neutral line on which the observed transverse fields is strong (greater than 150 Guass (G)) and strongly sheared (shear angle greater than 45 degrees), and (2) that L(sub ss) is well correlated with the coronal mass ejection (CME) productivity of the active regions during the plus or minus 2-day time window centered on the day of the magnetogram. In the present paper, from the same sample of 17 vector magnetograms, we show that there is a viable proxy for L(sub ss) that can be measured from a line-of-sight magnetogram. This proxy is the strong gradient length L(sub SG), the length of the portion of the main neutral line on which the potential transverse field is strong (greater than 150 G), and the gradient of the line-of-sight field is sufficiently steep (greater than approximately 50 G/Mm). In our sample of active regions, L(sub SG) is statistically significantly correlated with Lss (correlation confidence level greater than 95%), and L(sub SG) is as strongly correlated with active region CME productivity as is L(sub SS) (correlation confidence level approximately 99.7%). Because L(sub SG) can be measured from line-of-sight magnetograms obtained from conventional magnetographs, such as the magnetograph mode of the Michelson Doppler Imager (MDI) on board the Solar and Heliospheric Observatory, it is a dependable substitute for L(sub SS) for use in operational CME forecasting. In addition, via measurement of L(sub SG), the years-long, nearly continuous sequence of 1.5-hour cadence full disk line-of-sight magnetograms from MDI can be used to track the growth and decay of the large-scale nonpotentiality in active regions and to examine the role of this evolution in active region CME productivity.
    Keywords: Solar Physics
    Type: Journal of Geophysical Research (ISSN 0148-0227); Volume 108; No. A10
    Format: text
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 678-679 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE ability of the mustard compounds to induce gene mutations and chromosome re-arrangements was first detected in experiments with Drosophila melanogaster1–3. Subsequent investigators showed that this ability extends to all organisms which so far have been tested : ...
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  • 8
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1070-1071 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE inheritance of cancer susceptibility is not amenable to study by the methods of Mendelian genetics, because many genes are involved which cannot be recognized individually, and any measure of the degree of susceptibility is subject also to non-genetic variation1. The methods of quantitative ...
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 664-665 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The new gene is semi-dominant and behaves in every way as would be expected of a totally sex-linked gene with no homologue on the F-chromo-some, though the numbers of mice bred are not yet enough to detect minor deviations from expectation. There are three phenotypes in females,-corre-sponding to ...
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 244-245 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Aggregation chimaeras were made, by methods described previously1, between mice from strains selected for large (L) and small (S) body size, and between L and unselected control (C) mice; the history of the strains is given in ref. 2. Some C??C chimaeras are included for comparison. Fifty overt ...
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