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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Micron And Microscopica Acta 16 (1985), S. 109-113 
    ISSN: 0739-6260
    Keywords: Liposome ; SEM ; TEM ; freeze-drying ; freeze-fracture
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Women's Studies International Forum 17 (1994), S. 433-441 
    ISSN: 0277-5395
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Sociology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Women's Studies International Forum 17 (1994), S. 433-441 
    ISSN: 0277-5395
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Sociology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Animal Behaviour 28 (1980), S. 413-425 
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Plant Science Letters 6 (1976), S. 261-266 
    ISSN: 0304-4211
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 237 (1972), S. 322-327 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A sequence of about fifty amino-acids at the N-terminus of the lac repressor is thought to bind directly to lac operator DNA. Although this length cannot make the conventional cleft, it could form a protrusion; the manner in which such a protrusion interacts with the DNA site is discussed ...
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Gene amplification is one of the major mechanisms of oncogene activation in tumorigenesis. Currently, however, direct identification of amplified genes in cancer remains difficult. The most important technique allowing genome-wide screening of gene copy-number changes is comparative genomic ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 83 (1973), S. 63-71 
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We have developed two distinct methods of biological rhythm analysis. The procedures are based on existing techniques for analysis of time series, Enright's periodogram and autocorrelation, and both of the new methods use the parameter, period length (τ), for defining oscillatory phenomena. We empirically evaluated the two types of analyses using real biological data from circadian rhythm studies in salamanders and sparrows. The first method permits us to make a statistical comparison of period lengths between groups of animals in given treatments. This method is useful for data where the signal-to-noise ratio of the suspected rhythm is very low; and the method is not adequate for making a definitive judgment from single animals. It can best be applied to the question of whether a signal is entraining a rhythm or not and to questions of group differences in period length. With the second method, we determined period length versus time. Using this procedure, we took into consideration the observation that the period length of many biological oscillations changes with time. The method is applicable to records from individual animals, and it can be used to compare treatment effects in individual animals. The technique can also be used to answer the common question of whether periodicityper se exists within a defined range in a time series.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 12 (1933), S. 300-302 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 209 (1970), S. 276-292 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Aus Rinder- und Schweineovarien (Schlachttiere) wurden Oocyten durch eine Follikelpunktion entweder sofort nach der Schlachtung oder bis zu einem Zeitraum von 4 Std danach entnommen. Falls die Punktion nicht unmittelbar nach dem Herauspräparieren der Organe möglich war, wurden die Ovarien auf Eis bis zur weiteren Verarbeitung gelagert. Die extracorporale Reifung, Befruchtung und Embryonenzüchtung wurde versucht. Der Unterschied zwischen den jeweils gewonnenen und ausgewerteten Eiern in den entsprechenden Versuchen war durch die Präparierarbeiten bedingt. Von 1003 follikulären Rindereiern kamen 539 zur Auswertung. In 13 Oocyten war 1, in 2 Oocyten waren 2 und in 1 Oocyten waren 3 Polkörperchen sichtbar. Zwei Eizellen hatten geteilte Kerne („Zweizellstadium“). Bei den follikulären Schweineoocyten konnten von 851 Eiern 565 ausgewertet werden. In einer Oocyte wurde ein und in 3 Oocyten wurden zwei Polkörperchen gesehen. Vier follikuläre Schweineeier waren geteilt („Zweizellstadium“), eine Zellteilung erfolgte ohne Spermazugabe. Die 122 tubaren Schweineoocyten wurden durch eine Tubenspülung kurz nach der Ovulation gewonnen. Davon waren unmittelbar nach dem Ausspülen 28 geteilt und 94 ungeteilt. Die Teilung dieser Eizellen war sicher degenerativ (Fragmentation). Die ungeteilten tubaren Oocyten wurden mit und ohne Sperma kultiviert. An einer gelungenen extracorporalen Reifung sowohl der follikulären Rinder- und Schweineoocyten als auch der tubaren Schweineoocyten besteht kein Zweifel. Die Befruchtung und die Züchtung der Embryonen wird nicht bejaht, da der letzte Beweis, eine Transplantation der fraglichen Embryonen auf ein artgleiches nidationsreifes Endometrium mit dem Wachsen einer normalen Fruchtanlage, nicht geführt wurde. Mikrophotographien dokumentieren die Versuchsergebnisse.
    Notes: Summary From the ovaries of cows and pigs (animals for slaughter) oocytes were picked up by puncturing of a follicle either immediately after the slaughter has taken place or until 4 hours thereafter. In case puncture was not possible immediately after the organs had been removed the ovaries were placed on ice until they were processed further. The extracorporal maturation, fertilization and cultivation of embryos were attempted. The difference between the obtained eggs and those which could be evaluated in corresponding experiments was caused by the preparatory manipulation. Of 1003 follicular cow ova 539 were evaluated. In 13 oocytes there was 1, in 2 oocytes were 2 and in 1 oocyte were 3 polar bodies visible. Two of the ova showed a divided nucleus (“Two-cell state”). From the follicular pig oocytes 565 out of 851 could be evaluated. In one of the oocytes one single and in 3 of the oocytes 2 polar bodies were observed. Four follicular pig eggs were divided (“two-cell state”) one of the cell division had occurred without application of sperm. 122 tubal pig oocytes were obtained by rinsing the Fallopian tubes shortly after ovulation. Of those 28 were found to be divided and 94 undivided immediately after the rinsing. The division of these cells occurred degeneratively for certain (fragmentation). The undivided tubal oocytes were cultivated with and without sperm cells. There is no doubt about a successful extracorporal maturation as well of the follicular cow- and pig oocytes as of the tubal pig oocytes. Fertilization and cultivation of embryos are not affirmed, as the ultimate proof, a transplantation of the embryos in question to an endometrium of identical species and ripe for nidation followed by growth of a normal embryo could not be brought. Microphotographs are documenting the experimental results.
    Type of Medium: Electronic Resource
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