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  • 1990-1994  (4)
  • 1985-1989  (1)
  • 1880-1889  (2)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Pulsation in the Veins (1885)
    [s.l.] : Nature Publishing Group
    Nature 32 (1885), S. 466-466 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] IF Mr. Hippisley will refer to Landois' text-book, vol. i. p. 196, he will find it there stated, on the authority of Quincke, that a venous pulse occurs on rare occasions, normally, in the veins on the back of the hand and foot, when the peripheral ends of the arteries become dilated and ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/032466c0
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  • 2
    Digitale Medien
    Digitale Medien
    “The Shell-Collector's Hand-book for the Field” (1888)
    [s.l.] : Nature Publishing Group
    Nature 38 (1888), S. 103-104 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] As your reviewer (NATURE, May 17, p. 51) has shown that the little book which bears the above title is certainly worth a large share of “powder and shot,” I may, in all fairness, be allowed to reply to those strictures made by him which are the most unfair, and which I consider warrant a reply ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/038103e0
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  • 3
    facet.materialart.
    Unbekannt
    Two Y-Chromosome-Specific Restriction Fragment Length Polymorphisms (DYS11 and DYZ8) in Italian and Greek Migrants to Australia (1993)
    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 65:3 (1993:June) 387 
    Details
    ISSN: 0018-7143
    Thema: Biologie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5243-1993-065-03-000003
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  • 4
    Digitale Medien
    Digitale Medien
    X-chromosome inactivation in cultured cells from human chorionic villi (1989)
    Springer
    Somatic cell and molecular genetics 15 (1989), S. 131-136 
    Details
    ISSN: 1572-9931
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract X-chromosome inactivation was investigated in human chorionic villi in the first trimester of pregnancy and cultured cells established from them. Expression of glucose-6-phosphate dehydrogenase (G6PD) was evaluated in these extraembryonic cells from four females heterozygous for the electrophoretic variants (AB) of G6PD. In each case the uncultured villi as well as derived cultured cells expressed the AB phenotype for G6PD with about equal intensity for the A and B bands. Single-cell-derived clones established from two of the four cases expressed either G6PD A or B. One clone expressing G6PD B was fused with mouse cells, and a hybrid clone retaining the inactive human X chromosome was isolated; there was no evidence of human G6PD expression in this clone retaining an inactive human X. DNA methylation in the first intron of the human gene for hypoxanthine phosphoribosyltransferase (HPRT) was evaluated in the four pairs of cultured villi and fetal cells. No differences were detected between the cultured villi and fetal cells as they all showed bands characteristic of an inactive X from somatic cells. These results show that there is no preferential inactivation of an X in the majority of cells that constitute human tertiary chorionic villi or in cultured cells derived from them. Long-term cultures established from chorionic villi appear to be no different from somatic cells with respect to X-chromosome inactivation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01535073
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  • 5
    Digitale Medien
    Digitale Medien
    Culture of PNKT-4B cells at invasion permissive and restrictive temperatures. I. Chromosomal analysis (1990)
    Springer
    Clinical & experimental metastasis 8 (1990), S. 267-276 
    Details
    ISSN: 1573-7276
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract PNKT-4B is an aneuploid cell line derived from a herpesvirus-induced renal adenocarcinoma of Rana pipiens that displays restricted invasion at 21°C or cooler and invasion at 23°C through 28°C. Metaphase chromosomes obtained from subcultures (passages 297; 345–347) grown at 18°C or 28°C were Giemsa stained or N-banded with acidic silver nitrate. Cells grown at 18°C displayed a modal chromosome number of 41, while 28°C cultures displayed a modal number of 40. The distribution of the chromosomes suggests that the two temperatures may be allowing growth of different subclonal populations. N-banding of chromosomes at both temperatures revealed an increase of active nucleolar organizer regions (NORs) over normal frog tissues, 2/2N. Analysis of 200 N-banded spreads from cells grown at each temperature revealed modal numbers of 9 NORs/cell and modal numbers of 6 NOR-containing chromosomes/cell. Nine specific NOR-containing chromosomes were identified and scored. Similar distributions were observed at 18°C and 28°C. The data imply that the modal number of PNKT-4B has shifted since it was first described, 39, and differs at invasion-permissive and — restrictive temperatures. Increased numbers of active NORs and alterations of NOR-containing chromosomes imply an amplification of rDNA over the amount in normal frog.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00141257
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  • 6
    Digitale Medien
    Digitale Medien
    How the work of adhesion affects the mechanical properties of silica-filled polymer composites (1994)
    Springer
    Journal of materials science 29 (1994), S. 2406-2416 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract An equation correlating work of adhesion (W a) with Young's modulus and tensile strength of silica-filled polymer composites is derived. It shows that the logarithms of Young's modulus and tensile strength are inversely proportional to W a. Fourier transform infrared (FT. i.r.) results of the composites show that the silica interphase thickness increases with increased W a h values (the hydrogen bond component of W a). The logarithmic correlation between interphase thickness and W a is similar to that found for both Young's modulus and tensile strength. These similarities suggest that W a can be used to quantify interfacial bonding. Our study further shows that the composite with the lowest W a value follows the Guth-Smallwood equation for predicting Young's modulus. However, as the interphase layer becomes thicker (increased W a value), Young's modulus increases more than predicted from the Guth-Smallwood equation. Thus, an extension of the Guth-Smallwood equation is introduced to account for the effect of W a on the Young's modulus value.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00363434
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  • 7
    Digitale Medien
    Digitale Medien
    Using the bond energy density to predict the reinforcing ability of a composite (1992)
    Springer
    Journal of materials science 27 (1992), S. 4949-4956 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A model is proposed to predict the ability of a filler to reinforce a polymer. The model combines the effects of filler particle size, filler surface chemistry and filler volume fraction into one parameter called the bond energy density. Bond energy density is defined as the total interfacial bond energy per unit volume of a polymer composite. Bond energy density is determined by Fowkes's equation. The critical bond energy density, which is equivalent to the bond energy density of the composite when its tensile strength equals that of its matrix, determines whether a filler will reinforce or weaken a polymer. To get a filler reinforcing effect, the bond energy density of the composite must be greater than its critical bond energy density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01105259
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