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  • Articles  (195)
  • Animals  (134)
  • Chemical Engineering  (61)
  • Physical Chemistry
  • 1975-1979  (195)
  • Physics  (195)
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  • Articles  (195)
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  • 1
    Electronic Resource
    Electronic Resource
    The operating characteristics of twin screw extruders (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 660-667 
    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 operation of a twin screw extruder processing a powder or granular solid is reviewed. The operating variables of screw speed and barrel temperature profile interact with a number of design parameters -  screw design, die geometry, feed zone geometry and with the material properties, in determining machine performance. The factors that determine output and pressure development are specified in a sequence of block diagrams. The dynamic response of an operating machine to disturbances in the steady state conditions is explained in the light of the established relationships and interpreted in conventional control theory terms. Attention is drawn to the importance of mixing in the chambers formed by the screw channels and of the residence time distribution in determining the quality of the final product.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180810
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The distribution of lamellar lengths within a spherulite (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 299-305 
    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: One of the problems to be considered in the application of the Halpin-Kardos theory to crystalline polymers is the relation of the crystal length to the only related and measurable parameter, spherulite size. The number average crystal length has been computed for various two and three dimensional models for the crystallization process assuming heterogeneous nucleation. It was found that high values of crystallinity are consistent only with lamellae that are stacked in a parallel fashion. For these systems the number average lamellar length is 0.55 of the spherulite radius. Lower crystallinity polymers have an average lamellar length 0.3 to 0.5 of the spherulite radius, the actual value being determined by the radius. For spherulites of radius 1μm or greater, the size of the primary nucleus has no noticeable influence on the average lamellar length.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760180411
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hardness testing of plastics (1978)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 18 (1978), S. 869-874 
    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 effect of time of indentation and time of recovery on the Rockwell hardness, of a series of glassy and crystalline polymers has been determined. An analytical technique, based on conventional viscoelastic approaches, has been developed. This technique permits the resolution of the hardness number into its components of permanent deformation, retarded elastic compression, and retarded elastic recovery. Subtraction of components due to retarded elastic response results in hardness numbers dependent only the time-dependent permanent deformation. Extrapolation of this data to zero time results in an absolute or time-independent value of Rockwell hardness, designated Ro.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760181108
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  • 4
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    Sex pheromone of the tsetse fly: isolation, identification, and synthesis of contact aphrodisiacs (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-08-25
    Description: Sex pheromones isolated from the cuticle of the female tsetse fly, Glossina morsitans morsitans Westwood, release mating behavior in the male fly at ultrashort range or upon contact with baited decoys. Three active components were identified as 15,19-dimethylheptatriacontane, 17,21-dimethylheptatriacontane, and 15,19,23-trimethylheptatriacontane. Chemical and biological comparisons show that the natural and synthetic compounds are identical.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carlson, D A -- Langley, P A -- Huyton, P -- New York, N.Y. -- Science. 1978 Aug 25;201(4357):750-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/675256" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dose-Response Relationship, Drug ; Female ; Male ; Pheromones/*isolation & purification ; Sex Attractants/chemical synthesis/*isolation & purification/pharmacology ; Sexual Behavior, Animal/drug effects ; Tsetse Flies/*analysis
    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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  • 5
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    Chicken gizzard: relation between calcium-activated phosphorylation and contraction (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-05-04
    Description: Of the proteins in mechanically disrupted chicken gizzard fibers (no functional sarcolemma) only the 20,000-dalton light chains of myosin underwent large Ca2+-and Sr2+-dependent changes in phosphorylation. Phosphorylation closely corresponded with the Ca2+- and Sr2+-activated tensions. Adenosine 5'-O (3'-thiotriphosphate) only in the presence of Ca2+ induced irreversible Ca2+-insensitive activation of tension and thiophosphorylation of the 20,000-dalton light chains, and blocked incorporation of 32P from [gamma-32P]adenosine triphosphate into the myosin light chains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoar, P E -- Kerrick, W G -- Cassidy, P S -- New York, N.Y. -- Science. 1979 May 4;204(4392):503-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/432654" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/*pharmacology ; Chickens ; Gizzard/*physiology ; In Vitro Techniques ; Molecular Weight ; Muscle Contraction/*drug effects ; Muscle, Smooth/*physiology ; Myosins/*metabolism ; Phosphorylation ; Protein Kinases/metabolism
    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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  • 6
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    Inosine may be an endogenous ligand for benzodiazepine receptors on cultured spinal neurons (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-08-17
    Description: Mouse spinal neurons grown in tissue culture were used to study the membrane effects of the benzodiazepine flurazepam and the naturally occurring purine nucleoside inosine, which competes for benzodiazepine receptor sites in the central nervous system. Application of inosine elicited two types of transmitter-like membrane effects: a rapidly desensitizing excitatory response and a nondesensitizing inhibitory response. Flurazepam produced a similar excitatory response which showed cross-desensitization with the purine excitation. Flurazepam also blocked the inhibitory inosine response. The results provide electrophysiological evidence that an endogenous purine can activate two different conductances on spinal neurons and that flurazepam can activate one of the conductances and antagonize the other.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉MacDonald, J F -- Barker, J L -- Paul, S M -- Marangos, P J -- Skolnick, P -- New York, N.Y. -- Science. 1979 Aug 17;205(4407):715-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/37602" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzodiazepines/*metabolism ; Cells, Cultured ; Electric Conductivity ; Flurazepam/antagonists & inhibitors ; Inosine/*metabolism/pharmacology ; Ligands ; Mice ; Neurotransmitter Agents/metabolism ; Receptors, Drug/*metabolism ; Receptors, Neurotransmitter/metabolism ; Spinal Cord/*metabolism
    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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  • 7
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    Formation of mutagens in beef and beef extract during cooking (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-09-08
    Description: Mutagens, distinguishable from benzo[a]pyrene and from mutagenic amino acid and protein pyrolysis products, are formed when ground beef is cooked in a home hamburger cooking appliance or when beef stock is concentrated, by boiling, to a paste known commercially as beef extract. "Well-done" hamburgers contain about 0.14 part per million of the mutagens, and beef bouillon cubes which contain beef extract about 0.1 part per million. Since such mutagens may be potentially carcionogenic and are formed during ordinary cooking procedures, their occurrence raises questions about possible risks to human health.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Commoner, B -- Vithayathil, A J -- Dolara, P -- Nair, S -- Madyastha, P -- Cuca, G C -- New York, N.Y. -- Science. 1978 Sep 8;201(4359):913-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/567374" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzopyrenes ; Cattle ; *Hot Temperature ; Isoelectric Point ; Meat/*adverse effects ; Meat Products/adverse effects ; *Mutagens/analysis
    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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    Intracellular translocation of iodine-125-labeled insulin: direct demonstration in isolated hepatocytes (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-05-19
    Description: Insulin labeled with iodine-125 binds to receptors on isolated rat hepatocytes. At low temperatures initial binding is restricted to the plasma membrane as detected by direct quantitative autoradiographic analysis with the electron microscope. With increasing time and temperature of incubation there is a systematic and progressive translocation of autoradiographic grains to a highly limited area of the cell periphery representing no more than 15% of the radius of the cell.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gorden, P -- Carpentier, J L -- Freychet, P -- LeCam, A -- Orci, L -- New York, N.Y. -- Science. 1978 May 19;200(4343):782-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/644321" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/metabolism ; Endocytosis ; Insulin/*metabolism ; Kinetics ; Liver/*metabolism/ultrastructure ; Lymphocytes/metabolism ; Lysosomes/metabolism ; Molecular Weight ; Rats ; Receptor, Insulin/*metabolism
    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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    Immunity to antigens associated with primate C-type oncoviruses in pregnant women (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-24
    Description: Cell-mediated and humoral immune responses against antigens associated with primate C-type oncoviruses were evaluated in humans by microcytotoxicity and radioimmunoprecipitation assays. Five of six women tested sequentially during pregnancy developed selective cell-mediated reactivity against baboon endogenous virus (BEV)--infected human fibroblasts. Responsiveness peaked during the second and third trimesters and corresponded temporally with elevated antibody levels to BEV antigens. Similar cell-mediated reactivity was not observed in nonpregnant individuals. Selective cell-mediated reactivity directed against cells infected with the simian sarcoma virus-simian sarcoma associated virus complex (SSV--SSAV) was observed in four of 20 healthy adults (three of 14 nonpregnant, one of six pregnant). These observations suggest that cell-mediated reactivity against primate C-type oncoviruses is occasionally detected in healthy nonpregnant adults, but that during pregnancy both cell-mediated and humoral reactivity against BEV may become selectively expressed.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hirsch, M S -- Kelly, A P -- Chapin, D S -- Fuller, T C -- Black, P H -- Kurth, R -- New York, N.Y. -- Science. 1978 Mar 24;199(4335):1337-40.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Viral/*analysis ; *Antigens, Viral ; Female ; Humans ; *Immunity, Cellular ; Papio/microbiology ; *Pregnancy ; Pregnancy Trimester, First ; Pregnancy Trimester, Second ; Pregnancy Trimester, Third ; Retroviridae/*immunology ; Sarcoma Virus, Woolly Monkey/immunology
    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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  • 10
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    The LDH virus: an interfering biological contaminant (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-04-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Riley, V -- Spackman, D H -- Santisteban, G A -- Dalldorf, G -- Hellstrom, I -- Hellstrom, K E -- Lance, E M -- Rowson, K E -- Mahy, B W -- Alexander, P -- Stock, C C -- Sjogren, H O -- Hollander, V P -- Horzinek, M C -- New York, N.Y. -- Science. 1978 Apr 14;200(4338):124-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/263259" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Lactate dehydrogenase-elevating virus ; Mice ; Neoplasm Transplantation ; Neoplasms, Experimental/microbiology ; Virus Diseases/microbiology
    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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