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  • 1
    Electronic Resource
    Electronic Resource
    Fungal competition and mycotoxin production on corn (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 691-693 
    Details
    ISSN: 1420-9071
    Keywords: Aflatoxins ; secalonic acid D ; corn ; fungal competition ; mycotoxins ; Aspergillus flavus ; Penicillium oxalicum ; Fusaria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Aflatoxin and secalonic acid D production in corn in laboratory and field by mixed cultures ofPencillium oxalicum andAspergillus flavus orA. parasiticus was lower than production by the pure cultures. However, mixed culture of these molds withFusarium spp. did not affect mycotoxin production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02007725
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  • 2
    Electronic Resource
    Electronic Resource
    Metabolic precursor regulation of aflatoxin formation in toxigenic and non-toxigenic strains ofAspergillus flavus (1989)
    Springer
    Mycopathologia 107 (1989), S. 127-130 
    Details
    ISSN: 1573-0832
    Keywords: aflatoxin ; Aspergillus flavus ; non-toxigenic O-methylsterigmetocystin ; sterigmetocystin ; nontoxigenic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Non-aflatoxin-producing isolates ofAspergillus flavus from nature and isolates ofA. flavus that had lost their toxigenic trait following laboratory transfer were compared biochemically. After the addition of aflatoxin B1 precursors sterigmatocystin or O-methylsterigmatocystin to whole cell cultures, the non-toxin producing isolates from nature remained non-toxigenic while toxigenicity was restored in the nontoxigenic laboratory strains. Results imply a lack of enzymes needed for biochemical conversions of precursors to aflatoxin B1 in natural non-producers and suppression of these enzymes in the nonproducing laboratory strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707549
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  • 3
    Electronic Resource
    Electronic Resource
    The occurrence of Aspergillus flavus in vegetative tissue of cotton plants and its relation to seed infection (1986)
    Springer
    Mycopathologia 95 (1986), S. 171-174 
    Details
    ISSN: 1573-0832
    Keywords: Aspergillus flavus ; aflatoxin ; Gossypium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Twenty-seven mature cotton bolls with Aspergillus flavus Link colonies naturally occurring on the surface of the boll or lint were collected in the field in Arizona along with their subtending stems and peduncles. Bolls inoculated through the carpel wall 30 days after anthesis were allowed to mature in the field and were collected in the same manner. The seed and stem and peduncle sections of each boll were surface-sterilized, plated on agar media and observed for A. flavus. Seventy-eight percent of the naturally contaminated bolls with A. flavus in the seed also had the fungus in the stem and peduncle, whereas only 31% of the naturally contaminated bolls with no A. flavus in the seed had the fungus in the stem or peduncle. This difference was significant (P=0.0125), indicating a positive relationship between seed infection and stem and peduncle infection. All of the bolls inoculated through the carpel wall had A. flavus in the seed, but only 11% of the stem and peduncle sections were infected, indicating that the fungus does not readily grow downward from the boll into the supporting stem or peduncle. This unidirectional pattern of movement (upward) was further substantiated in greenhouse experiments where cotton seedlings were inoculated at the cotyledonary leaf scar with A. flavus and plants were sequentially harvested, surface sterilized and plated. Aspergillus flavus was isolated from the cotyledonary leaf scar, flower buds, developing bolls, and stem sections in the upper portion of the plant. It was never isolated from roots or stem sections below the cotyledonary node, again indicating that the fungus does not readily move downward through the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437123
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and metabolic changes in weanling rats with lesions in the dorsomedial hypothalamic nuclei (1972)
    Springer
    Experimental brain research 15 (1972), S. 424-429 
    Details
    ISSN: 1432-1106
    Keywords: Hypothalamus ; Metabolism ; Growth ; Dorsomedial Nucleus body composition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary When compared with sham-operated ad libitum-fed controls, weanling rats with lesions primarily destroying the dorsomedial hypothalamic nuclei (DMNL rats) showed reduced ponderal and linear growth and food intake, normal carcass fat but increased carcass protein. Among the metabolic parameters measured, DMNL rats showed only decreased incorporation of palmitate into epididymal fat pad phospholipid and triglyceride. When sham-operated controls were pair-fed with DMNL rats, they showed growth changes almost identical with those observed in lesioned rats. However, their carcass protein was lower than both that of the lesioned rats and the ad libitum-fed controls. Metabolically, the sham-operated, pair-fed controls showed decreased incorporation of palmitate into triglyceride of epididymal fat pads and decreased oxidation of glucose and increased incorporation into total lipid of the diaphragm. When previous data on growth hormone, insulin, triglyceride and cholesterol are compared with the present findings it is suggested that dorsomedial lesions cause a subcaloric-type dwarfism that does not involve adenohypophyseal secretions and their target organs affecting growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00234127
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  • 5
    Electronic Resource
    Electronic Resource
    Normal plasma growth hormone levels in growth-retarded weanling rats with dorsomedial hypothalamic lesions (1973)
    Springer
    Experimental brain research 18 (1973), S. 374-382 
    Details
    ISSN: 1432-1106
    Keywords: Growth retardation ; Hypothalamus ; Dorsomedial lesions ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Weanling rats received bilateral electrolytic lesions destroying the areas of the ventromedial (VMN) and dorsomedial (DMN) hypothalamic nuclei, respectively. Trunk blood was collected at sacrifice (Experiment 1 and 2∶ 31 days, Experiment 3∶ 14 days) for the determination of plasma growth hormone (GH) by radioimmunoassay. Rats with DMN lesions showed consistently normal to slightly elevated plasma GH levels while animals with VMN lesions showed significantly reduced plasma GH levels. Linear growth was reduced by both types of hypothalamic lesions but body weight gains and food intake were reduced only in the DMN lesioned rats. Carcass fat was greatly elevated in VMN lesioned rats, moderately elevated in one experiment in the DMN animals and normal in another experiment. These data confirm a previous hypothesis that growth retardation in DMN rats is not due to low circulating GH level but rather represents a hypocaloric-type dwarfism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239106
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  • 6
    Electronic Resource
    Electronic Resource
    Fracture toughness and crack instability in tough polymers under plane strain conditions (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1128-1136 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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 plane strain fracture toughness and fracture mechanisms of several tough engineering plastics have been studied and compared with poly(methyl methacrylate) (PMMA), a relatively brittle polymer. The tough polymers all are observed to form a multiple craze zone at the crack tip, which is shown to be the primary source of plane strain fracture toughness in these materials. The multiple craze zone is retained during slow crack growth but is metastable, and at a critical stress intensity and associated crack velocity, the system passes through a transition to a greatly accelerated single craze mode of unstable propagation.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271504
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  • 7
    Electronic Resource
    Electronic Resource
    Structure-Property-Processing relationships of polyurethane-polyester interpenetrating polymer networks (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 397-404 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: Interpenetrating polymer networks of polyurethane and unsaturated polyester were prepared by reaction injection molding (RIM) and transfer molding. The structures of the molded samples were analyzed by electron microscopy and dynamic mechanical analysis. It was found that polymer morphology and dynamic mechanical properties depend strongly on the molding temperature, reaction rate and reaction sequence. Simplified structure models based on Takayanagi's model and sample morphology can predict the storage modulus reasonably well but not the tanδ.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760290608
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  • 8
    Electronic Resource
    Electronic Resource
    A free radical copolymerization model for simulating reactive processing of unsaturated polyester resins (1990)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 684-692 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: A free radical copolymerization model is proposed for simulating the reaction rates and conversions of styrene monomer and unsaturated polyester resins during curing. This model is based on film theory in which the rate constants reflect both reaction and diffusion resistances. Differential scanning calorimetry in combination with Fourier transform infrared spectroscopy is used to measure the overall and individual reactivities of reacting species. Model parameters are determined from experimental data. The applicability of this model is demonstrated in a cure simulation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760301108
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of thermal and infrared spectroscopic analyses in the formation of polyurethane, unsaturated polyester, and their blends (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1325-1342 
    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: Differential scanning calorimetry (DSC) and infrared spectroscopy (IR) are two widely used techniques for the measurement of polymerization kinetics. Reactions of several thermoset polymers: a polyurethane, two unsaturated polyester resins, and polyurethane-polyester blends, were measured by these two methods. Results indicate that the thermal method is easy to use, and can generate both kinetic and thermal information. It is, however, less accurate and cannot detect detailed reaction mechanisms because the measurement relies upon the overall heat generation during reaction. Fourier transform infrared (FTIR) spectroscopy, on the other hand, can provide detailed kinetic information for multicomponent reactions such as styreneunsaturated polyester and polyurethane-polyester blends. Data analysis, however, is more tedious and requires reliable calibration. For an accurate kinetic measurement, both methods should be used because the results from both experiments can calibrate each other.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360607
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  • 10
    Electronic Resource
    Electronic Resource
    Mixing characteristics of urethane based materials and polyurea in RIM (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 251-266 
    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: To facilitate the study of new reaction injection molding (RIM) materials on a practical scale, a lab-scale mini-RIM machine was constructed. This machine is capable of delivering up to approximately 250 cc of material at rates of up to 125 cc/s. The RIM machine was first tested with conventional materials such as crosslinked and linear polyurethanes. The effect of varying the nozzle Reynolds number upon the adiabatic temperature rise corresponded to the results reported in previous works. Following this verification, two developmental materials, a polyurethane/polyester interpenetrating polymer network and a polyurea, were examined. The polyurea material showed a very strong dependency on mixing up to a Reynolds number above 400. The 75/25 PU/PEster reaction exotherms also showed a dependency upon mixing. However, this dependency is noticeable only in the polyester portion of the reaction, which can be attributed to the mixing sensitivity of the redox-type initiators used.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370120
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