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  • Chemical Engineering  (6)
  • Female  (5)
  • 2005-2009  (5)
  • 1990-1994  (6)
  • 1955-1959
  • 1
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 32 (1992), S. 861-867 
    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: Commercial polysulfone/polycarbonate (PSU/PC) polymer blends were reprocessed up to five times to determine the influence that reprocessing has on their structure and physical properties. All the high strain properties, mainly ductility, significantly decreased under harsh processing conditions, such as five cycles at 320°C. The results of reprocessing the blends at 320°C have been compared with results at a lower temperature and also with those of the separate components with the aim of clarifying the origin of the degradation. These results plus Fourier transform infrared spectroscopy (FTIR), dynamic mechanical analysis, and melt flow index measurements (MFI) indicate that the presence of the two polymers together clearly decreases the resistance to degradation of each component. Moreover, degradation under the stated conditions is mainly thermal and does not change the chemical nature of the blends. However, a clear decrease in molecular weight was observed both by viscosimetry and MFI measurements as was a shift to higher temperatures of the low temperature secondary transition of both PC and PSU. Both molecular weight and secondary transition changes usually deteriorate mechanical properties but not in the degree observed here. This probably means that the fine and difficult-to-observe structure of the blend has also changed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 1243-1253 
    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 degree of hydrogen bonding and macroscopic thermodynamic properties for pure and mixed fluids are predicted with the hydrogen bonding lattice fluid (LFHB) equation of state over a wide range in density encompassing the gas, liquid and supercritical states. The model is successful for molecules forming complex self-associated networks, in this case pure methanol, ethanol, and water, and the mixture 1-hexanol-SF6. In supercritical water, significant hydrogen bonding is still present despite all the thermal energy and is highly pressure- and temperature-dependent. A fundamental description of pressure and temperature effects on hydrogen bonding is presented for a well-defined case, the formation of a complex between a donor and acceptor in an inert solvent, where no self-association is present. The partial molar enthalpy and volume change on complexation both become pronounced near the critical point, where the density is highly variable with temperature and pressure.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 31 (1991), S. 245-252 
    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 study has been made of property optimization of a composite based on low density polyethylene and polypropylene (PP) blend matrices with talc modified by a titanate coupling agent. Analysis shows that the flexural properties improve with increasing content of both talc and polypropylene. However, the tensile moduli show a different behavior. Tensile strength is hardly affected by the filler content at PP percentages in the matrix above 50 percent. The surface modified talc gives rise to higher mechanical properties than the unmodified talc. This improvement is more noticeable as talc and PP percentages in the composite is increased. Scanning electron microscopy has shown the effect of the coupling agent at the filler/polymer matrix interphase and the greater affinity between talc and polypropylene.
    Additional Material: 13 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 13 (1991), S. 160-164 
    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: Dry blends of a PVC resin with various plasticizer mixtures were processed at different temperatures to produce samples of different degrees of fusion. The ease of fusion increased with decreasing the solid-gel transition temperature (Tm) of the plasticizer mixture. Nevertheless. Tm was not necessarily a linear function of the individual concentration of plasticizers in the mixture. Therefore, the ease of fusion showed in some cases an optimum at a given concentration of the plasticizer mixture.
    Additional Material: 7 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 13 (1991), S. 184-186 
    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: The effect of mixing time, temperature, and thermal treatment on mechanical properties of crosslinked PVC is investigated. The tensile properties and gel content of crosslinked and uncrosslinked PVC molded samples are evaluated. The cured samples exhibited higher tensile strength and thermal stability than unmodified PVC.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Brookfield, Conn. : Wiley-Blackwell
    Journal of Vinyl and Additive Technology 14 (1992), S. 74-77 
    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: The compatibility of suspension PVC with various plasticizer blends was determined by means of calculated compatibility predictors, such as solubility parameters and polarity parameters, as well as actual measurements of compatibility. Then, with a torque rheometer, the temperature at the fusion peak was obtained for various PVC/plasticizer blend compositions. Finally, empirical equations were derived to relate compatibility parameters with the temperature at the fusion peak, predicting the effect of plasticizer blend on processability.
    Additional Material: 6 Ill.
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  • 7
    Publication Date: 2005-10-08
    Description: Most people hold beliefs about personality characteristics typical of members of their own and others' cultures. These perceptions of national character may be generalizations from personal experience, stereotypes with a "kernel of truth," or inaccurate stereotypes. We obtained national character ratings of 3989 people from 49 cultures and compared them with the average personality scores of culture members assessed by observer ratings and self-reports. National character ratings were reliable but did not converge with assessed traits. Perceptions of national character thus appear to be unfounded stereotypes that may serve the function of maintaining a national identity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775052/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2775052/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Terracciano, A -- Abdel-Khalek, A M -- Adam, N -- Adamovova, L -- Ahn, C-k -- Ahn, H-n -- Alansari, B M -- Alcalay, L -- Allik, J -- Angleitner, A -- Avia, M D -- Ayearst, L E -- Barbaranelli, C -- Beer, A -- Borg-Cunen, M A -- Bratko, D -- Brunner-Sciarra, M -- Budzinski, L -- Camart, N -- Dahourou, D -- De Fruyt, F -- de Lima, M P -- del Pilar, G E H -- Diener, E -- Falzon, R -- Fernando, K -- Fickova, E -- Fischer, R -- Flores-Mendoza, C -- Ghayur, M A -- Gulgoz, S -- Hagberg, B -- Halberstadt, J -- Halim, M S -- Hrebickova, M -- Humrichouse, J -- Jensen, H H -- Jocic, D D -- Jonsson, F H -- Khoury, B -- Klinkosz, W -- Knezevic, G -- Lauri, M A -- Leibovich, N -- Martin, T A -- Marusic, I -- Mastor, K A -- Matsumoto, D -- McRorie, M -- Meshcheriakov, B -- Mortensen, E L -- Munyae, M -- Nagy, J -- Nakazato, K -- Nansubuga, F -- Oishi, S -- Ojedokun, A O -- Ostendorf, F -- Paulhus, D L -- Pelevin, S -- Petot, J-M -- Podobnik, N -- Porrata, J L -- Pramila, V S -- Prentice, G -- Realo, A -- Reategui, N -- Rolland, J-P -- Rossier, J -- Ruch, W -- Rus, V S -- Sanchez-Bernardos, M L -- Schmidt, V -- Sciculna-Calleja, S -- Sekowski, A -- Shakespeare-Finch, J -- Shimonaka, Y -- Simonetti, F -- Sineshaw, T -- Siuta, J -- Smith, P B -- Trapnell, P D -- Trobst, K K -- Wang, L -- Yik, M -- Zupancic, A -- McCrae, R R -- Z99 AG999999/Intramural NIH HHS/ -- ZIA AG000180-25/Intramural NIH HHS/ -- ZIA AG000180-26/Intramural NIH HHS/ -- New York, N.Y. -- Science. 2005 Oct 7;310(5745):96-100.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute on Aging, NIH, DHHS, Gerontology Research Center, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA. terraccianoa@grc.nia.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16210536" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; *Character ; Cross-Cultural Comparison ; *Culture ; *Ethnic Groups ; Female ; Humans ; Male ; *Personality ; Personality Assessment ; Reproducibility of Results ; Social Perception ; Stereotyping ; Surveys and Questionnaires
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2005-01-08
    Description: Segmental duplications in the human genome are selectively enriched for genes involved in immunity, although the phenotypic consequences for host defense are unknown. We show that there are significant interindividual and interpopulation differences in the copy number of a segmental duplication encompassing the gene encoding CCL3L1 (MIP-1alphaP), a potent human immunodeficiency virus-1 (HIV-1)-suppressive chemokine and ligand for the HIV coreceptor CCR5. Possession of a CCL3L1 copy number lower than the population average is associated with markedly enhanced HIV/acquired immunodeficiency syndrome (AIDS) susceptibility. This susceptibility is even greater in individuals who also possess disease-accelerating CCR5 genotypes. This relationship between CCL3L1 dose and altered HIV/AIDS susceptibility points to a central role for CCL3L1 in HIV/AIDS pathogenesis and indicates that differences in the dose of immune response genes may constitute a genetic basis for variable responses to infectious diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gonzalez, Enrique -- Kulkarni, Hemant -- Bolivar, Hector -- Mangano, Andrea -- Sanchez, Racquel -- Catano, Gabriel -- Nibbs, Robert J -- Freedman, Barry I -- Quinones, Marlon P -- Bamshad, Michael J -- Murthy, Krishna K -- Rovin, Brad H -- Bradley, William -- Clark, Robert A -- Anderson, Stephanie A -- O'connell, Robert J -- Agan, Brian K -- Ahuja, Seema S -- Bologna, Rosa -- Sen, Luisa -- Dolan, Matthew J -- Ahuja, Sunil K -- AI043279/AI/NIAID NIH HHS/ -- AI046326/AI/NIAID NIH HHS/ -- MH069270/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2005 Mar 4;307(5714):1434-40. Epub 2005 Jan 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Veterans Administration Research Center for AIDS and HIV-1 Infection, South Texas Veterans Health Care System, and Department of Medicine, University of Texas Health Science Center, San Antonio, TX 78229, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15637236" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; Aged ; Animals ; Chemokines, CC/*genetics/metabolism ; Child ; Cohort Studies ; Continental Population Groups/genetics ; Disease Progression ; Ethnic Groups/genetics ; Female ; *Gene Dosage ; *Gene Duplication ; *Genetic Predisposition to Disease ; Genotype ; HIV Infections/epidemiology/*genetics/*immunology/virology ; *HIV-1/metabolism ; Humans ; Male ; Middle Aged ; Pan troglodytes/genetics ; Phenotype ; Public Health ; Receptors, CCR5/genetics/metabolism ; Selection, Genetic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2005-10-01
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grant, Robert M -- Buchbinder, Susan -- Cates, Willard Jr -- Clarke, Edith -- Coates, Thomas -- Cohen, Myron S -- Delaney, Martin -- Flores, Guiselly -- Goicochea, Pedro -- Gonsalves, Gregg -- Harrington, Mark -- Lama, Javier R -- MacQueen, Kathleen M -- Moore, John P -- Peterson, Leigh -- Sanchez, Jorge -- Thompson, Melanie -- Wainberg, Mark A -- New York, N.Y. -- Science. 2005 Sep 30;309(5744):2170-1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gladstone Institute of Virology and Immunology, San Francisco, CA, USA. rgrant@itsa.ucsf.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16195446" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine/adverse effects/*analogs & derivatives/economics/therapeutic use ; Africa ; Anti-HIV Agents/adverse effects/economics/*therapeutic use ; Asia ; Consumer Participation ; *Controlled Clinical Trials as Topic/standards ; Counseling ; Developing Countries ; Drug Costs ; Female ; HIV Infections/*prevention & control ; Health Services Accessibility ; Humans ; Latin America ; Male ; Organophosphonates/adverse effects/economics/*therapeutic use ; Patient Selection ; Tenofovir
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2006-11-04
    Description: Reduction of core body temperature has been proposed to contribute to the increased life span and the antiaging effects conferred by calorie restriction (CR). Validation of this hypothesis has been difficult in homeotherms, primarily due to a lack of experimental models. We report that transgenic mice engineered to overexpress the uncoupling protein 2 in hypocretin neurons (Hcrt-UCP2) have elevated hypothalamic temperature. The effects of local temperature elevation on the central thermostat resulted in a 0.3 degrees to 0.5 degrees C reduction of the core body temperature. Fed ad libitum, Hcrt-UCP2 transgenic mice had the same caloric intake as their wild-type littermates but had increased energy efficiency and a greater median life span (12% increase in males; 20% increase in females). Thus, modest, sustained reduction of core body temperature prolonged life span independent of altered diet or CR.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Conti, Bruno -- Sanchez-Alavez, Manuel -- Winsky-Sommerer, Raphaelle -- Morale, Maria Concetta -- Lucero, Jacinta -- Brownell, Sara -- Fabre, Veronique -- Huitron-Resendiz, Salvador -- Henriksen, Steven -- Zorrilla, Eric P -- de Lecea, Luis -- Bartfai, Tamas -- MH58543/MH/NIMH NIH HHS/ -- NS043501/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2006 Nov 3;314(5800):825-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Harold L. Dorris Neurological Research Center, Scripps Research Institute, La Jolla, CA 92037, USA. bconti@scripps.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17082459" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; *Body Temperature ; Body Temperature Regulation ; Body Weight ; Circadian Rhythm ; Drinking ; Eating ; Energy Metabolism ; Female ; Hypothalamic Area, Lateral/cytology/metabolism ; Intracellular Signaling Peptides and Proteins/metabolism ; Ion Channels/genetics/physiology ; *Longevity ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Transgenic ; Mitochondrial Proteins/genetics/physiology ; Neurons/metabolism ; Neuropeptides/metabolism ; Orexins ; Preoptic Area/cytology/*physiology ; Thermogenesis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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