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  • Polymer and Materials Science  (7)
  • Engineering  (2)
  • LY163502  (2)
  • Pisum sativum  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of D2-dopaminergic receptor stimulation on the lordotic response of female rats (1987)
    Springer
    Psychopharmacology 91 (1987), S. 96-100 
    Details
    ISSN: 1432-2072
    Keywords: Lordotic behavior ; Dopamine ; D2 receptors ; LY163502 ; Autoreceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of LY163502, a highly selective D2 dopaminergic agonist, on the lordotic response of ovariectomized, estrogen-treated rats were evaluated. LY163502, administered subcutaneously or orally, produced a significantly greater lordotic response than vehicle. LY175877 [the opposite (+) enantiomer] was found to be inactive. The effects of subcutaneous administered LY163502 were abolished by prior treatment with dopaminergic receptor antagonists such as haloperidol orcis-flupenthixol. These studies are supportive of the view that LY163502 can initiate and potentiate female sexual behavior by stimulating D2 type dopaminergic receptors. In contrast to the enhancement of lordotic response that was observed in nonreceptive female rats, LY163502 was found to have suppressive effects on lordotic response frequency of receptive (estrogen-progesterone-treated) female rats. Reductions in lordotic responding occurred in two dose ranges, above and below the dose range found to potentiate lordotic response. The maximal suppressive effect at the low dose range was observed at 250 pg/kg, SC. This reduction in lordotic responding was proposed to be associated with a selective dopaminergic autoreceptor activation, leading to a diminished dopamine release and expression of a dopamine-mediated behavior (i.e., lordotic response). The reduction of lordotic responding that was observed at higher doses (25 μg/kg-25 mg/kg) was associated with an induction of stereotypic behavior that may have disrupted the sexual response pattern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690934
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of D2-dopaminergic receptor stimulation on male rat sexual behavior (1987)
    Springer
    Journal of neural transmission 68 (1987), S. 153-170 
    Details
    ISSN: 1435-1463
    Keywords: Dopamine ; sexual behavior ; LY163502 ; autoreceptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of selective D2-dopaminergic receptor stimulation with LY163502 on male rat copulatory behavior were evaluated. LY163502 (25 ng/kg to 25Μg/kg s. c.) produced increases in the percentage of sexually inactive rats displaying mounting behavior and ejaculating during the test period. Within this same dose range, LY163502 administration induced an increase in the percentage of non-ejaculator rats that were capable of ejaculation. These findings are viewed as evidence that LY163502 can initiate sexual behavior and lower the threshold for ejaculation. The effects of LY163502 were further evaluated in rats that were capable of ejaculation during the test period. LY163502 (25 ng/kg to 25Μg/kg s. c. or p. o.) induced significant reductions in ejaculatory latency. These effects were blocked by prior treatment with centrally active dopaminergic antagonists, RO 22-1319 and sulpiride, but not with a peripherally active antagonist, domperidone. LY163502 administration was also found to inhibit sexual behavior in low doses of 25 pg/kg −10 ng/kg s. c. and in a much larger dose of 25 mg/kg s. c. These inhibitory effects are viewed as behavioral manifestations of selective dopaminergic autoreceptor activation with low doses and as the disruption of sexual behavior by induction of intense stereotypic behavior with high doses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02098495
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  • 3
    Electronic Resource
    Electronic Resource
    A quantitative stereological analysis of the effect of indoleacetic acid on the dictyosomes in pea stem epidermal cells (1985)
    Springer
    Protoplasma 125 (1985), S. 230-234 
    Details
    ISSN: 1615-6102
    Keywords: Dictyosomes ; Indoleacetic acid ; Pisum sativum ; Stereology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A quantitative analysis of electron micrographs showed that IAA treatment caused an initial rapid increase in the amount of dictyosome material in pea stem epidermal cells. The increase was detected within 15 minutes of auxin presentation and reached a maximum around 30 minutes. This was followed by a decrease, presumably due to an increased utilization of the organelle. The decrease involved a fall in the amount of dictyosome-derived vesicles and in the actual number of dictyosomes. The results are discussed in relation to similar observations on expanding cells of monocotyledonous plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01281242
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of activated gas plasma treatment time on adhesive bondability of polymers (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1465-1477 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The bondability of the following polymers as a function of length of exposure to excited helium or oxygen was investigated: low-density polyethylene, high-density polyethylene (two types), poly(4-methyl-1-pentene), poly(vinyl fluoride), poly(vinylidene fluoride), FEP Teflon, poly(oxymethylene) copolymer, nylon 6, nylon 66, poly(ethylene terephthalate), and polystyrene. Generally, the bond strength increase rapidly initially and then remains nearly constant, perhaps decreasing in some cases at long exposure times. A method is presented for calculating bond strength-versus-exposure time curves. The calculated curves generally fit the data reasonably well. Polypropylene showed a rapid increase in bondability with exposure to excited oxygen. Helium was ineffective toward this polymer under normal conditions, but could produce good bond strength at higher temperatures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160615
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  • 5
    Electronic Resource
    Electronic Resource
    Thermal properties of rigid polymers. I. Measurement of thermal conductivity and questions concerning contact resistanceThis work is drawn in part from the thesis of John A. Hall, submitted in partial fulfillment of the Master of Science degree requirements of the University of Maine at Orono. (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 2029-2039 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Several studies of the influence of contact resistance on the measurement of thermal conductivity of polystyrene using a steady-state device are presented. In each case it is seen that, although this influence can perhaps be minimized, it cannot be eliminated as an experimental complication. A novel technique is then described which does eliminate entirely contact resistance as a variable, and this technique is shown to yield an unequivocal value of thermal conductivity.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330615
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of calcium antagonists and inhibitors of secretory processes on auxin-induced elongation and fine structure ofPisum sativum stem segments (1986)
    Springer
    Protoplasma 133 (1986), S. 149-159 
    Details
    ISSN: 1615-6102
    Keywords: Calcium ; Cell elongation ; Indole-3-acetic acid ; Pisum sativum ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The treatment of dark grown pea stem segments with chelators of divalent cations (EGTA, EDTA, CTC), various Ca2+ antagonists (LaCl3, A-23187, verapamil) and inhibitors of secretory processes (monensin, CB) reduced elongation in the presence of indole-3-acetic acid (IAA). Generally the inhibition increased with increasing concentrations of the substances. The timing of the responses can be correlated with maximum auxin-stimulated secretion of cell wall material. Examination of cell ultrastructure showed that changes in dictyosome activity could explain a reduced deposition of cell wall material and so cause inhibition of elongation. The inhibitors affected the morphology and vesiculation of the dictyosomes, and the appearance of the plasma membrane, ER and mitochondria in different ways. The most pronounced effects on ultrastructure resulted from monensin and LaCl3 treatments with the dictyosomes being most affected; large vesicles appeared in the cytoplasm. Less pronounced effects on cell structure were seen in EGTA, A-23187 and verapamil treated tissue. The effects on the dictyosomes are considered to be due to disturbances of Ca2+ and other ionic levels within the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304630
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  • 7
    Electronic Resource
    Electronic Resource
    Activated gas plasma surface treatment of polymers for adhesive bonding (1969)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 2085-2096 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyethylene, polypropylene, poly(vinyl fluoride) (Tedlar), polystyrene, nylon 6, poly(ethylene terephthalate) (Mylar), polycarbonate, cellulose acetate butyrate, and a poly(oxymethylene) copolymer were treated with activated helium and with activated oxygen. Mechanical strengths of adhesive-bonded specimens prepared from treated and from untreated coupons were compared. Polyethylene (PE) and polypropylene (PP) showed the greatest increases in bond strength. Oxygen and helium were both effective with polyethylene, but polypropylene showed no improvement when treated with activated helium. The results with excited helium parallel the effects of ionizing radiation on these two polymers, as does the appearance of unsaturation bands in the infrared (965 cm-1 in PE, and 887 and 910 cm-1 in PP). Active nitrogen produced excellent bond strength with polyethylene but not with polypropylene. Of the remaining polymers examined, Tedlar, polystyrene, and nylon 6 showed the greatest improvement in bondability after treatment, and Mylar showed moderate improvement. Polycarbonate, cellulose acetate butyrate, and the poly(oxymethylene) copolymer gave approximately two-fold increases in lap-shear bond strength. In several cases, significant differences in response to time of treatment and type of excited gas were found.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1969.070131006
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  • 8
    Electronic Resource
    Electronic Resource
    The multigrid method in solid mechanics: Part II - Practical applications (1990)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 739-753 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The performance of the multigrid algorithm is investigated by solving some large, practical, three dimensional solid mechanics problems. The convergence of the method is sensitive to factors such as the amount of bending present and the degree of mesh non-uniformity, as was also observed in Part I for two dimensional problems. However, in contrast to Part I, no proportionality is observed between the total number of operations to convergence and the problem size. Despite such behaviour, the multigrid algorithm proves to be an effective matrix equation solver for solid mechanics poblems. It is orders of magnitude faster than a direct factorization method, and yields converged solutions several times faster than the Jacobi preconditioned conjugate gradient method.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620290405
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  • 9
    Electronic Resource
    Electronic Resource
    The multigrid method in solid mechanics: Part I - Algorithm description and behaviour (1990)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 29 (1990), S. 719-737 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A multigrid algorithm is described that can be used to obtain the finite element solution of linear elastic solid mechanics problems. The method is applied to some two dimensional problems to evaluate its strengths and weaknesses. Extensive studies are made to determine the convergence behaviour of the method. In general, this depends on many factors: the number of degrees-of-freedom in the discretization, characteristics of the algorithm, Poisson's ratio when it is close to 0·5, the amount of bending deformation in the problem under consideration, and the degree of non-uniformity in the mesh. Only certain values of the multigrid parameters allow a converged solution to be obtained with a computational effort proportional to the number of degrees-of-freedom. These values include the optimum ones, i.e. those that lead to convergence with the least computational effort. The constant of proportionality is only independent of the number of degrees-of-freedom and still depends on the other factors listed above.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620290404
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  • 10
    Electronic Resource
    Electronic Resource
    Emulsion copolymerization of butadiene and styrene in the presence of carbon black (1962)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 57 (1962), S. 693-709 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Carbon blacks inhibit and retard free radical polymerization in bulk and solution. The mechanism of this is discussed in terms of the chemical groups present on the carbon surface. It is shown that the number of free radicals which react during the induction period (polymerization of styrene with AIBN) is much less than the number of quinone groups but of the same order of magnitude as the number of easily oxidizable groups. Inhibition by carbon black was also found in an emulsion polymerization system with cumene hydroperoxide as initiator (no reducing components). By use of highly active redox recipes, reasonable rates of polymerization were obtained at both 50°C. (sugar-iron-hydroperoxide recipe) and 5°C. (peroxide-polyamine recipe), with as much as 40 parts of black per 100 parts of monomers. In these systems, the carbon black was charged as an aqueous dispersion stabilized with Daxad 11; the latices were stable and showed evidence of association between some of the carbon black and some of the latex particles. The coagulated rubber stocks, when compounded and cured, gave properties closely similar to those of dry mixed stocks.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1962.1205716555
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