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  • 1
    Call number: M 16.90189
    In: Episodes
    Type of Medium: Monograph available for loan
    Pages: Seite 82-547 , Illustrationen, Karten
    Classification: A.3.7.
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Variation of DA/DAPI intensity in the Yq12 band was observed in five amniotic cell specimens and one blood specimen from the father of one fetus. Three distinct classes of Yq heterochromatin were identified by distamycin A (DA) treatment of the cell cultures and various staining techniques. The heterochromatin in the Yq11.23 sub-band does not under-condense when exposed to DA, and shows pale fluorescence with quinacrine staining, positive C-banding, and bright fluorescence with DA/DAPI technique. This class of heterochromatin was consistently observed in all specimens studied. The other two classes of heterochromatin are in the Yq12 band. Both show undercondensation when exposed to DA, quinacrine-bright fluorescence, and positive C-banding; howover, one class of heterochromatin shows DA/DAPI-bright fluorescence and the other shows pale fluorescence. The size and banding intensity of the two classes of heterochromatin in Yq12 are variable. These results provide cytological evidence of heterogeneity within the Y heterochromatin region containing AT-rich DNA.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A comparison of the sequence of DNA replication in an isodicentric (idic) X chromosome was made between peripheral blood lymphocytes and skin fibroblasts from a 33-year-old female with primary amenorrhea, somatic stigmata of Turner syndrome, and normal stature and intelligence. The patient had a karyotype 45,X/46,X,idic(X)(q27.1) in lymphocytes and 46,X,idic(X)(q27.1) in skin fibroblasts. Both centromeric regions of the idic X showed C-staining but only one primary constriction. BrdU-33258 Hoechst-Giemsa techniques were used to analyze regional DNA replication patterns. The idic X chromosome was always late replicating in lymphocytes and skin fibroblasts, except that about 1–2% of cells completed replication simultaneously in both normal and idic X chromosomes. Fifty-six percent of the asymmetric patterns in lymphocytes showed an equal proportion of early and late functional and non-functional centromere halves. In skin fibroblasts, 60.8% of cells were asymmetric: the functional half tended to replicate later than the non-functional half. Some differences were observed between these two cell types. As examples, band q23 was late replicating in lymphocytes, but early replicating in fibroblasts; q25 was intermediate to late replicating in lymphocytes, but one of the last bands to complete replication in fibroblasts. Thus, different cell typed influenced the replication kinetics in the idic(X). Furthermore, several variants of the replication sequence were found in both cell types. The findings support the hypothesis that the control of DNA replication in the inactive X chromosome is multifocal, and suggest that the active idic X chromosome replication may reflect a relative lack of self-control or heterogeneity of cell population.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 2018-06-08
    Keywords: Astrodynamics
    Format: text
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  • 5
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    In:  Other Sources
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Type: EUROAVIA-VKI Scientific and Educational Symposium; Sint-Genesius-Rode; Belgium
    Format: text
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 261 (1976), S. 377-381 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Optical signals can be guided and manipulated in thin films deposited on a substrate. The new technology will allow the implementation of key circuit functions at optical ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Australian Government Analytical Laboratories (AGAL) has historically been the major provider of chemical and micro biological analytical services to the Australian Government. An equally important role has been the provision of specialist functions associated with: •development and implementation of new and improved testing methods; •evaluation and commissioning of new instrumentation; •advice and assistance to government with the design, implementation and conduct of proficiency testing programs, particularly in areas of chemical testing related to international trade. In July 1993, in response to increasing international interest in chemical metrology, AGAL established a Valid Analytical Measurement program focused on improving the acceptability of laboratory data and supporting the development of appropriate standards through the National Standards Commission. AGAL has recently surveyed Australian residue testing laboratories to determine their priority requirements for reference materials and inter laboratory check sample programs. Survey results have clearly demonstrated a need for reasonably priced, certified reference materials for pesticide and antibiotic residue testing in raw agricultural produce. There are few reference materials available in this field of testing, particularly for residues of concern in Australia. AGAL has therefore initiated action as follows: •Preparation and certification of two priority reference materials (i) organochlorines (dieldrin and heptachlor epoxide) in animal fat, (ii) organophosphates (diazinon, chlorpyrifos and ethion) in animal fat. •Investigation of storage stability of animal liver samples containing avermectin, sulphonamide and other antibiotic residues to ascertain suitability for reference material production. In the area of proficiency testing, AGAL provides ongoing services (in close consultation with NATA, the National Association of Testing Authorities) to the Australian export meat industry. AGAL is seeking to expand this role to involve a wider range of laboratories engaged in residue testing of both export and domestic produce. The Australian Government believes it has an important role to play, particularly in the South East Asian and Pacific Rim regions, in co-operation, collaboration, assistance with training, and provision of specialist technical services.
    Type of Medium: Electronic Resource
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  • 8
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    In:  Other Sources
    Publication Date: 2018-06-08
    Keywords: Lunar and Planetary Science and Exploration
    Format: text
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  • 9
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An analysis is given of phase-reversal electrode structures used for phase matching in travelling-wave integrated-optic phase modulators. Both modulus and argument of the phase shift are obtained; both are required for applications involving broadband excitation. Periodic and non-periodic lossy structures are treated and the advantage of non-periodic structures for wide-band operation is demonstrated. Optimum structure arrangements and upper bounds to phase shift and figure of merit are derived.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The heat and force produced in tetanic contraction of single fibres from anterior tibialis muscle of the frogRana temporaria have been observed at measured temperatures close to 1 and 10° C. Heat was measured using a Hill-Downing type thermopile. In control experiments with a resistor of known heat capacity comparable to a single muscle fibre, it was found that Peltier and Joule heating produced identical thermopile outputs. The Peltier method was used to introduce a known amount of heat into the system in each experiment with a muscle fibre. From the response to this heating the heat capacity of each preparation was obtained and used to calculate the absolute amount of heat production from the thermopile output. The heat produced during tetanic contraction (H) could be described by Aubert's equation [H=H a (1−e t/τ)+h b t]. In some fibres there was no labile heat (Ha), whereas in others it was clearly present. The stable heat rate (h b ) was strongly temperature dependent (Q 10 = 4.06). At 0° C the stable heat rate (normalized by dry weight) in the single fibres was significantly greater than that in whole anterior tibialis muscle.
    Type of Medium: Electronic Resource
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