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  • 1985-1989  (3)
  • 1975-1979
  • 1955-1959
  • 1925-1929
  • Cell & Developmental Biology  (2)
  • Cell movement  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Models of dispersal in biological systems (1988)
    Springer
    Journal of mathematical biology 26 (1988), S. 263-298 
    Details
    ISSN: 1432-1416
    Keywords: Dispersal ; Cell movement ; Random walks ; Stochastic processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract In order to provide a general framework within which the dispersal of cells or organisms can be studied, we introduce two stochastic processes that model the major modes of dispersal that are observed in nature. In the first type of movement, which we call the position jump or kangaroo process, the process comprises a sequence of alternating pauses and jumps. The duration of a pause is governed by a waiting time distribution, and the direction and distance traveled during a jump is fixed by the kernel of an integral operator that governs the spatial redistribution. Under certain assumptions concerning the existence of limits as the mean step size goes to zero and the frequency of stepping goes to infinity the process is governed by a diffusion equation, but other partial differential equations may result under different assumptions. The second major type of movement leads to what we call a velocity jump process. In this case the motion consists of a sequence of “runs” separated by reorientations, during which a new velocity is chosen. We show that under certain assumptions this process leads to a damped wave equation called the telegrapher's equation. We derive explicit expressions for the mean squared displacement and other experimentally observable quantities. Several generalizations, including the incorporation of a resting time between movements, are also studied. The available data on the motion of cells and other organisms is reviewed, and it is shown how the analysis of such data within the framework provided here can be carried out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277392
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nerve growth factor biosynthesis: Isolation and characterization of a guinea pig prostate kallikrein (1985)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 29 (1985), S. 309-319 
    Details
    ISSN: 0730-2312
    Keywords: guinea pig ; kallikrein ; nerve growth-factor ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Guinea pig prostate contains one major soluble esteropeptidase activity. The protein has been purified and characterized and found to be a glycoprotein comprised of a single polypeptide chain. The molecular weight of the deglycosylated protein is approximately 26,000. The esteropeptidase has a similar Km for lysine and arginine synthetic substrates, although the Vmax for arginine is much greater than that for lysine. Amino-terminal sequence analysis has also revealed a marked degree of homology to mouse γ-nerve growth factor (NGF) and the kallikrein family of serine proteases. In contrast to γ-NGF, however, the guinea pig enzyme does not appear to form stable complexes with β-NGF.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240290405
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Role of glandular kallikreins as growth factor processing enzymes: Structural and evolutionary considerations (1987)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 33 (1987), S. 65-75 
    Details
    ISSN: 0730-2312
    Keywords: precursor ; hormone ; limited proteolysis ; submandibular gland ; prostate ; nerve growth factor ; epidermal growth factor ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Hormones and growth factors are generally released from larger precursors by limited proteolysis. The causative agents remain poorly defined with respect to location and properties. One subset of proteases, the glandular kallikreins, have been implicated in a few cases, in part because of their specific association with mature forms of some hormones. However, limited distribution and low copy number in some species cast doubt on this hypothesis, and they may well play other physiological functions that remain to be elucidated.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240330107
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    Paper (German National Licenses)
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