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  • 1
    Electronic Resource
    Electronic Resource
    Chemical reaction networks with finite attractor regions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 3107-3117 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper gives a test which establishes that a chemical reaction network has a finite globally attracting region in concentration space for a particular set of rate constants. A second test can establish the same conclusion for all sets of rate constants. If a network passes either test and all the steady states of the system are unstable, there must exist some exotic attractor such as a limit cycle, torus, or chaos either for the set of rate constants used or for all sets of rate constants. A computer algorithm for applying the test is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448955
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  • 2
    Electronic Resource
    Electronic Resource
    Fucosylation Events during Mammalian Spermatogenesis 〈link href="#fn2"〉b〈/link〉 (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 513 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb24998.x
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  • 3
    Electronic Resource
    Electronic Resource
    Characterization of fucosyltransferase activity during mouse spermatogenesis: evidence for a cell surface fucosyltransferase (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 1611-1617 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00430a028
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Schmidt's Betriebswirtschaft Theory (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Abacus 22 (1986), S. 0 
    Details
    ISSN: 1467-6281
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: Those only speking English are confronted with considerable confusion regarding the precise nature of Fritz Schmidt's contribution to the German Betriebswirschaft (business economics) movement during the 1920s. The similarity between his theory and the Bedrijfseconomie theory attributed to Theodore Limperg has also been less than clear. The primary cause is that their repective works have not been translated from the original German and Dutch and published in English. This paper draws upon translations to illustrate the substantial similarity between the accounting content of Schmidt's Betriebswirtschaft and that of Limperg's Bedrijfseconomie. Translatio of the 1951 biography of Schmidt by his student and then colleague, publications are contained in Appendix B. Contrary to some perceptions of Schmidt's work, he did address the general price level problem in his theory. And contrary to Limperg's criticism that Schmidt's mechanism for adiusting accounts for prifce and brice level changes was‘incident specific’, it was an integral part of a theory of business economics which appears to have been at least as comprehensive as Limperg's theory of Bedrijfseconomie.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-6281.1986.tb00128.x
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  • 5
    Electronic Resource
    Electronic Resource
    Immunochemical identification of multiple cell surface antigens appearing during specific stages of mouse spermatogenesis (1986)
    New York, NY : Wiley-Blackwell
    Gamete Research 13 (1986), S. 199-211 
    Details
    ISSN: 0148-7280
    Keywords: spermatogenesis ; cell surface antigens ; electrophoretic immunoblots ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Cell surface antigens that appear in a defined temporal sequence during mouse spermatogenesis were previously detected serologically, but not identified biochemically, with four heterologous antibodies prepared against purified populations of pachytene spermatocytes (AP), round spermatids (ARS), vas deferens spermatozoa (AVDS), and mixed seminiferous cells (ASC) [Millette and Bellvé, J Cell Biol 74:86-97, 1977]. These antigens have now been identified immunochemically on nitrocellulose blots from SDS polyacrylamide gels. Three antisera (AP, ARS, and ASC) recognize a similar subset of determinants on one-dimensional immunoblots of germ cells and plasma membranes prepared from a mixed population of late spermatogenic cells. Comparisons of minor bands to reveal differences among these antisera. AVDS exhibits the least complex binding pattern. The results indicate that at least ten surface constituents appear during the pachytene stage of meiosis, coincident with a period of maximal RNA and protein synthesis [Monesi, Exp Cell Res 39:197-224, 1965]. Furthermore, two-dimensional immunoblot comparisons of plasma membranes isolated from pachytene spermatocytes and round spermatids reveal differences between surface determinants detectable at these two spermatogenic stages. For example, ASC recognizes two newly described proteins that are restricted to pachytene spermatocytes (˜ Mr 57,000, pI 6.45) and to round spermatids (˜ Mr 39,500, pI 4.85), respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120130303
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  • 6
    Electronic Resource
    Electronic Resource
    Expression and topographical localization of cell surface fucosyltransferase activity during epididymal sperm maturation in the mouse (1989)
    New York, NY : Wiley-Blackwell
    Gamete Research 22 (1989), S. 321-332 
    Details
    ISSN: 0148-7280
    Keywords: glycotransferase ; plasma membrane ; spermatozoa ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: We have demonstrated previously that spermatogenic cells in the mouse testis have high levels of fucosyltransferase activity. Furthermore, a significant portion of this activity has been localized to the cell surface (Millette et al.: Cell Biology of the Testis and Epididymis, 1987). Differential expression of fucosyltransferases and their function as ecto-enzymes may be important in the processes of sperm maturation and fertilization in mammals. Accordingly, here we report the activity levels of fucosyltransferase (FT) in spermatozoa isolated from the mouse caput and cauda epididymides. Calculated on a per cell basis, spermatozoa from the caput epididymis have significantly more FT activity than do spermatozoa from the cauda epididymis (18.07 ± 2.2 pmol/million cells compared with 2.8 ± 0.09 pmol/million cells). Furthermore, caput sperm exhibit a more significant increase in FT activity when assayed in the presence of Nonidet P-40. Calculated on the basis of cell surface area, however, FT activity remains constant on the head portion of spermatozoa isolated from all portions of the male reproductive tract and from capacitated spermatozoa. Measurements of FT activity in extracts of isolated sperm tails from cells at different stages of maturation indicate a greatly diminished activity in tails from sperm in the cauda epididymis. The total sperm surface area is composed predominantly of the plasma membrane surrounding the flagellar apparatus. Therefore, our data demonstrate that FT activity is retained selectively on the different topological regions of sperm, with losses during sperm maturation in the epididymis being restricted to the tail segment. Maintenance of high levels of FT activity of the plasma membranes of the mouse sperm head raise the possibility that FT is indeed involved in some aspects of sperm-egg recognition.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120220309
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  • 7
    Electronic Resource
    Electronic Resource
    Protein carboxyl methyltransferase activity specific for age-modified aspartyl residues in mouse testes and ovaries: Evidence for translation during spermiogenesis (1989)
    New York, NY : Wiley-Blackwell
    Gamete Research 22 (1989), S. 307-319 
    Details
    ISSN: 0148-7280
    Keywords: protein methylation ; carboxylmethyltransferase ; S-adenosylmethionine ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: An antiserum prepared against the purified protein carboxyl methltransferase (PCMT) from bovine brain has been used to compare testicular and ovarian levels of the enzyme and to study the regulation of PCMT concentrations during spermatogenesis. The PCMT, which specifically modifies age-damaged aspartyl residues, is present at a significantly higher concentration in mature mouse testis than in ovary. However, the PCMT is present at nearly equal concentrations in extracts of germ cell-deficient ovaries and testes obtained from mutant atrichosislatrichosis mice. In normal testis, the concentration of the PCMT increases severalfold during the first 4-5 weeks after birth, paralleling the appearance and maturation of testicular germ cells. Both immunochemical and enzymatic measurements of PCMT specific activities in purified spermatogenic cell preparations indicate that PCMT levels are twofold and 3.5-fold higher in round spermatids and residual bodies, respectively, than in pachytene spermatocytes. The results are consistent with the enhanced synthesis and/or stability of the PCMT in spermatogenic cells and with the continued translation of the PCMT during the haploid portion of spermatogenesis. The relatively high levels of PCMT in spermatogenic cells may be important for the extensive metabolism of proteins accompanying spermatid condensation or for the repair of damaged proteins in translationally inactive spermatozoa.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120220308
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