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  • Polymer and Materials Science  (9)
  • Chemiluminescence  (2)
  • Development  (2)
  • Macrocyst  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The developmental fate of dictyostelium discoideum cells depends greatly on the cell-cycle position at the onset of starvation
    Amsterdam : Elsevier
    Cell Differentiation 22 (1987), S. 11-18 
    Details
    ISSN: 0045-6039
    Keywords: Cell adhesion ; Cell cycle ; Cell sorting ; Chemotaxis ; Development ; Dictyostelium discoideum
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0045-6039(87)90409-X
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  • 2
    Electronic Resource
    Electronic Resource
    Photographic chemiluminescent ELISA for detection of anti-human T-cell leukemia virus type-I antibodies by using synthetic peptides as antigens
    Amsterdam : Elsevier
    Clinica Chimica Acta 211 (1992), S. 113-119 
    Details
    ISSN: 0009-8981
    Keywords: Chemiluminescence ; ELISA ; HTLV-I ; Instant photographic film ; Luminol ; Synthetic peptide
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-8981(92)90110-C
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  • 3
    Electronic Resource
    Electronic Resource
    Chemiluminescence method for the determination of gaseous chlorine species in ambient air
    Amsterdam : Elsevier
    Analytica Chimica Acta 266 (1992), S. 353-358 
    Details
    ISSN: 0003-2670
    Keywords: Air ; Chemiluminescence ; Chlorine ; Hydrogen chloride
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0003-2670(92)85063-C
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  • 4
    Electronic Resource
    Electronic Resource
    Involvement of cytoplasmic pH in the production of ethylene, a potent inducer of sexual development inDictyostelium mucoroides (1991)
    Springer
    Protoplasma 160 (1991), S. 72-76 
    Details
    ISSN: 1615-6102
    Keywords: Dictyostelium mucoroides ; Cellular slime mold ; Cytoplasmic pH ; Ethylene ; Cyclic AMP ; Sexual development ; Macrocyst ; Sorocarp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Dictyostelium mucoroides-7 (Dm 7) and a mutant MF 1 derived from it exhibit two developmental pathways: sorocarp formation occurs during the asexual process, and macrocyst formation during the sexual cycle. The two developmental pathways are mainly regulated by two chemical substances: 3′,5′-cyclic adenosine monophosphate (cAMP) and ethylene. Recently, we have demonstrated that cytoplasmic pH (pHi) has a critical role for the choice of developmental pathways, higher pHi being favourable to macrocyst formation. Thereupon, attention was riveted to the relation of pHi to biosynthesis of cAMP and ethylene. Effect of pHi on the production and release of ethylene, a potent inducer of macrocyst formation, was examined, using the two facing culture method. The result showed that lowered pHi inhibits ethylene production, thus resulting in a failure of cells to form macrocysts. The accumulation of cAMP, an inhibitor of macrocyst formation, was found to vary depending on extracellular pH (pHo), but diethylstilbestrol (DES) that is a proton pump inhibitor and also an inhibitor of macrocyst formation had no significant effect on the accumulation. Taken together these results indicate that higher pHi may induce macrocyst formation through enhancement of ethylene production rather than inhibition of cAMP synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01539958
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  • 5
    Electronic Resource
    Electronic Resource
    Development of prespore vacuoles inDictyostelium cells differentiating in a liquid shake culture (1984)
    Springer
    Protoplasma 123 (1984), S. 152-159 
    Details
    ISSN: 1615-6102
    Keywords: Cellular slime mold ; Dictyostelium discoideum ; Development ; Electronmicroscopy ; Golgi apparatus ; Prespore vacuole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When shaken in a glucose-albumin-cyclic AMP medium, dissociated aggregative cells form small clumps in which prespore cells differentiate fairly synchronously (Okamoto 1981). Formation of prespore vacuoles (PSVs) in differentiating prespore cells was examined in these culture conditions, by electronmicroscopy and immunocytochemistry. After 6 hours of culture, a typical Golgi apparatus composed of vesicles and stacked flat cisternae develops near the nucleus. FITC-conjugated antispore serum stains a crescent-shaped region in the cells which seems to correspond to the Golgi area. After 9 hours, flat sacs which contain electron dense lining membrane similar to that of PSVs appear alongside Golgi cisternae. Later, partially and fully round PSVs are observed in this region, suggesting that flat sacs round up to become mature PSVs. After 12 hours, as mature PSVs increase in number, they become dispersed throughout the cytoplasm and a typical Golgi apparatus with cisternae disappears. When cultured in a medium devoid of cyclic AMP, cells develop neither Golgi cisternae nor PSVs. These results strongly suggest that PSVs form from Golgi cisternae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283585
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  • 6
    Electronic Resource
    Electronic Resource
    Separation of water-ethanol by pervaporation through polyion complex composite membranePaper presented at 3rd International Conference on Pervaporation Processes in the Chemical Industry, September 1922, Nancy, France. (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 3229-3239 
    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: For the purpose of separating alcohol-water mixtures by the use of the pervaporation technique, new composite membranes composed of polyion complexes (PIC) as a separating layer were developed. The polyion complex structure, consisting of polyacrylic acid (PAA) and polycation, provided excellent permeation rate and selectivity. Among the polycations, ionenes, which have quaternary ammonium groups in the backbone chain, were effective in giving membranes of higher permselectivities. High selectivity of PIC membranes was observed at high ethanol concentration regions in the feed mixture. For the azeotropic mixture of water/ethanol (95 wt % EtOH) at 60°C, the PAA-based PIC membrane had the following separation properties: separation factor ∼ 3,500 and permeation rate ∼ 1.6 kg/m2 h.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070421216
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  • 7
    Electronic Resource
    Electronic Resource
    The ethylene action in the development of cellular slime molds: an analogy to higher plants (1992)
    Springer
    Protoplasma 167 (1992), S. 159-168 
    Details
    ISSN: 1615-6102
    Keywords: Dictyostelium mucoroides ; Ethylene ; Sexual development ; Macrocyst ; Sorocarp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cellular slime moldDictyostelium mucoroides-7 (Dm 7) and its mutant (MF 1) exhibit sexual or asexual development depending upon culture conditions. During the sexual cycle macrocyst formation occurs, whereas sorocarps containing spores and stalk cells are asexually formed. As previously reported, the macrocyst formation is marked by the emergence of true zygotes, and is induced by a potent plant hormone, ethylene. The concentration of ethylene required for macrocyst induction was determined to establish the similarity of ethylene action between this organism and higher plants. Macrocysts are induced by low (1 μl/l) exogenous concentrations of ethylene. Higher concentrations (10–1,000 ul/l) also gave essentially the same inductive activity. Ethionine, an analogue of methionine, was found to inhibit zygote formation during sexual development through its interference with ethylene production by Dm 7 and MF 1 cells. In fact, the inhibitory effect of ethionine was mostly nullified by the application of ethylene, S-adenosyl-L-methionine, or 1-aminocyclopropane-1-carboxylic acid. Taken together these results suggest that both the effective concentration of ethylene and the pathway of ethylene biosynthesis inD. mucoroides may be similar to those in higher plants. Ethylene was also found to be produced in various species and strains of cellular slime molds, even during the asexual process. The possible functions of ethylene in the asexual development are discussed in relation to cell aggregation and differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403379
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  • 8
    Electronic Resource
    Electronic Resource
    Gas and vapor sorption in polymers just below Tg (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 30 (1985), S. 4019-4029 
    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: Generally, sorption isotherms for gases like CO2 in glassy polymers are concave to the pressure axis, whereas in the rubbery state these isotherms are linear for gases or sometimes convex to the pressure axis for more condensable vapors. Examples of CO2 isotherms are reported here that show at low pressure the curvature characteristic of glasses and then become linear at higher pressures. This is observed when the glass transition temperature Tg is not much greater than the observation temperature T, and plasticization of the polymer by sorbed CO2 causes Tg to become equal to T within the range of pressures employed in the isotherm measurement. For the sorption of vapors in glassy polymers, this can lead to sigmoidal isotherms, as discussed using an illustration from the literature.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1985.070301006
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  • 9
    Electronic Resource
    Electronic Resource
    Gas permeation in polyethersulfone (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 33 (1987), S. 1823-1828 
    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
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070330533
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of dual-mode sorption and mobility parameters from permeation experiments (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 24 (1986), S. 121-131 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The precise pressure dependence of apparent diffusion and permeation coefficients was measured by using a microcomputer system for collecting and treating permeation data for CO2 in glassy poly(ethylene terephthalate) below 1 atm between 15 and 40°C. The partial immobilization model was used to determine the dual-mode sorption and mobility parameters. The curves calculated with these parameters were in excellent agreement with experimental data. These parameters were also compared with sorption parameters obtained from measurements at 30°C. There was a small difference between the values of the parameters obtained from these permeation data and those from sorption data which we had previously obtained. Relations between this difference and the method of determination of the parameters are discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1986.180240113
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