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  • Chemical Engineering  (6)
  • Animals  (3)
  • 1985-1989  (9)
  • 1970-1974
  • 1987  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Melt flow behavior of blends from poly(vinyl chloride) and epoxidized natural rubber (1987)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 9 (1987), S. 161-167 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Blends from poly(vinyl chloride) (PVC) and epoxidized natural rubber (ENR) were prepared in a Brabender plasticorder by the melt blending technique. The melt flow behavior of these blends with respect to blend ratio and temperature has been examined using a melt flow indexer and capillary rheometer. ENR decreases the Brabender torque, increases the melt flow index (MFI), and decreases the melt viscosity of PVC in the blends. Arrhenius plots were used to study the effect of temperature on melt flow index (MFI) and viscosity. Moreover, the flow behavior index (n′) obtained from capillary rheometer data was found to be dependent on temperature and blend ratio.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730090406
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  • 2
    Electronic Resource
    Electronic Resource
    Phase holdups in three-phase fluidized beds (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 1359-1370 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The local bubble frequency, the local phase holdups and the local bed porosity in three-phase fluidized beds were measured. Air, water, and 250 μm glass beads were used as the gas, liquid, and solid phases. The effects of gas and liquid velocities on phase holdups were studied. Time-averaged local gas holdup and bubble frequency were measured by an optical fiber probe. Mass balances were performed at various axial positions along the fluidized beds to check the accuracy of the measurements.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690330813
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  • 3
    Electronic Resource
    Electronic Resource
    Effective thermal conductivity in a packed-bed radial-flow reactor (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 1747-1750 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690331021
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  • 4
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of potassium chloride from brine and scale-up criterion (1987)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 33 (1987), S. 1690-1697 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A systematic study of potassium chloride crystallization shows that constant tip speed, TIPS, is the agitation criterion for scale-up. Three hydrodynamic regions are identified by a group MT TIPS3. Thus, a new generalized kinetic equation is proposed: B° = KGi(MT TIPS)j.The values of the power index j are 0.7 and 1.2 for low and high ranges of MT TIPS3, respectively. At even higher MT TIPS3, j scatters due to the breakage of crystals. The power index i is independent of hydrodynamic conditions and depends only on the crystallization temperature, e.g., it is 2.8 at 313.2 K.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690331012
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  • 5
    Electronic Resource
    Electronic Resource
    Adhesive tack and green strength of EPDM rubber (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1195-1202 
    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: Measurement of tack of EPDM (ethylene-propylenediene terpolymer) rubber with natural rubber (NR) of four different molecular weights, styrene-butadiene rubber (SBR), butadiene rubber (BR), bromobutyl rubber (BIIR), and polychloroprene rubber (CR) was done over a range of rates of testing, contact times, and temperatures of contact. The effect of different additives, namely carbon black, phenol-formaldehyde resin, coumarone-indene resin, and methyl methacrylate is also reported. Green strength of all the rubbers was measured. Tack strength increases with increase in contact time for all the rubbers. Adhesive tack between EPDM and low-molecular-weight NR is much higher than that between EPDM and NR of high molecular weight. Tack strength of EPDM with BIIR is the highest among the tack values obtained for synthetic rubbers. The adhesive tack between EPDM and natural/ synthetic rubber passes through a maximum when plotted against temperature of contact. It increases with testing rate. All these phenomena could be explained in terms of interdiffusion of rubber chains under different conditions and solubility parameter of two contacting rubbers. It was observed that tack strength varies with (contact time)1/2 and (rate)1/2 in accordance with the reptation theory. Phenol-formaldehyde resin (PF) or coumarone-indene (CI) resin in EPDM improves the tack strength quite significantly. The resin in the NR phase does not have a marked effect. The presence of carbon black decreases adhesive tack strength between EPDM and NR. The surface of EPDM, however, becomes smoother with the addition of the additives. Peel tests and commercial tack tests give similar results in the tack strength between EPDM/NR and EPDM/SBR.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271513
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on morphology, mechanical properties and failure mode of blends of plasticized poly(vinyl chloride) and thermoplastic copolyester elastomer (1987)
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 9 (1987), S. 71-85 
    Details
    ISSN: 0193-7197
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Morphology and mechanical properties of blends of plasticized poly(vinyl chloride) (PVC) and thermoplastic copolyester elastomer (Hytrel 40D) have been studied with special reference to the effect of blend ratios. Morphology of the blends indicates that the Hytrel phase is dispersed as domains in the continuous PVC phase up to 75 percent of its concentration. Dynamic mechanical analysis of the blends shows marginal level of compatibility between the two phases. The mechanical properties depend on the proportion of thermoplastic rubber in the blend. Attempts have been made to correlate the blend morphology with properties. Failure surfaces were examined by scanning electron microscope and it was found that the fractographs depend on the type of failure (tensile or tear) and on the blend composition.
    Additional Material: 30 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/vnl.730090209
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  • 7
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    Visualization of viral clearance in the living animal (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-04-24
    Description: The early events in viral dissemination via the bloodstream were identified by monitoring the fate of 123I-radiolabeled reovirus after it was injected intravenously in rats. Continuous scintillation camera imaging showed that reovirus serotypes 1 and 3 were cleared from the circulation in less than 10 minutes by specific and distinct target organs. Reovirus serotype 1 accumulated predominantly in the lungs and the liver, whereas serotype 3 accumulated in the liver and the spleen with very little virus uptake by the lungs. Incubation of reovirus serotype 1 with a monoclonal antibody directed against the viral hemagglutinin before injection totally inhibited the clearance of the virus by the lungs. Similar results were obtained when viruses biolabeled with 35S were used. These results demonstrate that viruses can be rapidly transported through the bloodstream to specific target organs and that the localization of the viruses depends on the interaction between specific viral surface components and the target organ.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Verdin, E M -- Maratos-Flier, E -- Kahn, C R -- Sodoyez, J C -- Sodoyez-Goffaux, F -- De Vos, C J -- Lynn, S P -- Fields, B N -- AI 3178/AI/NIAID NIH HHS/ -- AM 01252/AM/NIADDK NIH HHS/ -- New York, N.Y. -- Science. 1987 Apr 24;236(4800):439-42.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3031817" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Antibody Complex ; Iodine Radioisotopes ; Mammalian orthoreovirus 3/physiology ; Reoviridae/immunology/*physiology ; Reoviridae Infections/*microbiology ; Time Factors ; Tissue Distribution
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 8
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    Structurally distinct, stage-specific ribosomes occur in Plasmodium (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-11-13
    Description: Two structurally distinct nuclear genes code for cytoplasmic small subunit ribosomal RNA's in the parasite Plasmodium berghei. Stable transcripts from one of the ribosomal RNA genes are found almost exclusively in those stages of the life cycle that develop in the mosquito. When the parasite infects the mammalian host, transcripts from the second gene become the predominant small subunit ribosomal RNA species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gunderson, J H -- Sogin, M L -- Wollett, G -- Hollingdale, M -- de la Cruz, V F -- Waters, A P -- McCutchan, T F -- GM 32964/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Nov 13;238(4829):933-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Jewish Center for Immunology and Respiratory Medicine, Denver, CO 80206.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3672135" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Base Sequence ; *Genes ; Molecular Sequence Data ; Nucleic Acid Conformation ; Plasmodium/*genetics/growth & development ; RNA, Ribosomal/*genetics ; Ribosomes/*physiology ; Transcription, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 9
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    Rapid stimulation of diacylglycerol production in Xenopus oocytes by microinjection of H-ras p21 (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-10-23
    Description: The p21 products of ras proto-oncogenes are thought to be important components in pathways regulating normal cell proliferation and differentiation. These proteins acquire transforming properties as a result of activating lesions that convert ras genes to oncogenes in a wide array of malignancies. In Xenopus laevis oocytes, microinjection of transforming ras p21 is a potent inducer of maturation, whereas microinjection of a monoclonal antibody to ras p21 inhibits normal maturation induced by hormones. The phosphoinositide pathway is a ubiquitous system that appears to play a key role in diverse cellular functions. By use of the Xenopus oocyte system, it was possible to quantitate the effects of ras p21 microinjection on individual components of the phosphoinositide pathway. Within 20 minutes of microinjection, levels of phosphatidylinositol 4,5-bisphosphate, inositol 1-phosphate, and inositol bisphosphate increased 1.5- to 2-fold. The most striking effects were on diacylglycerol, which increased 5-fold under the same conditions. In contrast, the normal ras p21 protein induced no detectable alteration in any of the metabolites analyzed. The earliest effects of the transforming p21 on phosphoinositol turnover were observable within 2 minutes, implying a very rapid effect of ras p21 on the enzymes involved in phospholipid metabolism.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lacal, J C -- de la Pena, P -- Moscat, J -- Garcia-Barreno, P -- Anderson, P S -- Aaronson, S A -- New York, N.Y. -- Science. 1987 Oct 23;238(4826):533-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2821623" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Diglycerides/*biosynthesis ; Female ; Glycerides/*biosynthesis ; Glycerol/metabolism ; Inositol/metabolism ; Inositol Phosphates/biosynthesis ; Kinetics ; Microinjections ; Oocytes/drug effects/*metabolism ; Phosphatidylinositol 4,5-Diphosphate ; Phosphatidylinositols/biosynthesis/*metabolism ; Proto-Oncogene Proteins/*pharmacology ; Proto-Oncogene Proteins p21(ras) ; Xenopus laevis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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