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  • Electronic Resource  (3)
  • 1995-1999  (3)
  • 1980-1984
  • Frog  (1)
  • G-CSF  (1)
  • Smoluchowski.  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of comparative physiology 178 (1996), S. 293-305 
    ISSN: 1432-1351
    Keywords: Frog ; Tectum ; Brainstem ; Approach ; Avoidance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract High-speed videography was used to describe the initial turning movement of visually triggered escape in frogs and to compare it with the initial turn of frog prey capture behavior. These two types of turning had some general similarities, e.g. turn duration and peak velocity were positively correlated with turn angle. However, there were kinematic differences: for turns of a given angular amplitude, escape turns consistently demonstrated shorter duration and higher peak velocity than prey capture turns. There also were differences predictably matched to stimulus angles; escape turn angles were more variably related to stimulus angles. Both turning movements are believed to depend upon the optic tectum. However, given the observed differences in kinematics and spatial organization, we used lesion experiments to determine if distinct tectal efferent pathways subserve turning under each circumstance. Large unilateral lesions of the brainstem simultaneously disrupted both types of turning. However, smaller laterally placed lesions disrupted escape turning without disrupting prey capture turns. The kinematic differences in combination with the lesion results support the idea that the post-tectal circuitry for visually elicited turning movements is based upon separate descending pathways that control turning toward prey and turning away from threat.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Key words AML ; AIDS ; Leukemia ; G-CSF
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Although hematologic dysplasia is common in HIV disease, evolution to AML is unusual. We report a case of AML in a patient with stage-C3 AIDS who had been previously treated with granulocyte colony-stimulating factor (G-CSF). This 41-year-old black man presented with pancytopenia (Hg 8.6 g/dl, Hct 24.3%, platelets 16,000/mm3, WBC 0.6× 103/mm3) and hemoptysis. His peripheral smear manifested 19% blasts. His bone marrow biopsy was hypocellular (20%) with greater than 90% blasts, which were positive for myeloperoxidase and Sudan black B. The blasts were negative for nonspecific esterase. Immunophenotypic analysis by flow cytometry showed the majority of cells to be of myeloid lineage, expressing CD13, and CD45 at low intensity. In addition, there was aberrant expression of CD2 and no expression of CD14 or CD4. The diagnosis of AML-FAB-M1 was made. The patient refused chemotherapy. Of the rare cases of AML in HIV patients previously reported in the literature, the majority were of the monocytic or myelomonocytic subtype. This case is of special interest because of prior G-CSF therapy. In this setting, the relationship between HIV, G-CSF, and subsequent AML is controversial.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of engineering mathematics 36 (1999), S. 57-88 
    ISSN: 1573-2703
    Keywords: coagulation equations ; asymptotics ; self-similar solutions ; Smoluchowski.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Technology
    Notes: Abstract This paper describes solutions to the Smoluchowski coagulation equations with power-law kernels in both constant-mass and constant-monomer cases. Exact solutions are obtained in special cases by a generating function approach. For more general kernels, the large-time behaviour is obtained by use of matched asymptotics. Numerical results are also given, which confirm the asymptotic analysis.
    Type of Medium: Electronic Resource
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