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  • LIFE SCIENCES (GENERAL)  (14)
  • SPACE BIOLOGY  (13)
  • Polymer and Materials Science  (3)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 16 (1955), S. 1-9 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: 38 Dialkylesters of o-phthalic acid are examined as plasticizers for polyvinyl chloride. The plasticizer efficiency is determined by means of dielectric measurements for the molar plasticizer concentration c = 0.1. In the case of isomeric esters the n-alkylesters always have the highest plasticizer efficiency while with the n-alkylesters the efficiency increases proportionally with the length of the alkyl chain. The influence of chain length and branching of the alkylgroup also shows itself in the viscosity of the pure plasticizer. From the graphical representation of the relationship between plasticizer efficiency Δ T and viscosity η conclusions may be drawn concerning the structure of the alkyl groops.
    Notes: 38 o-Phthalsäuredialkylester werden als Weichmacher für Polyvinylchlorid (PVC) untersucht. Die Weichmacher-Wirksamkeit wird, wie in früheren Arbeiten, mit Hilfe dielektrischer Messungen bestimmt, für die molare Weichmacher-Konzentration c = 0,1. Bei isomeren Estern hat der n-Alkylester immer die höchste Weichmacher-Wirksamkeit und bei den n-Alkylestern steigt die Weichmacher-Wirksamkeit mit der Länge des Alkyls linerar an. Die Länge und Verzweigung des Alkyls macht sich auch in der Viskosität des reinen Weichmachers bemerkbar. Die Kombination von Weichmacher-Wirksamkeit Δ T und Viskosität in dem Diagramm Δ T = f (η) führt zu Hinweisen auf den strukturellen Aufbau der Alkyle.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 26 (1995), S. 553-559 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Bestimmung der Spannungstensoren in dünnen, texturierten Kupferschichten mittels Röntgenbeugung bei streifendem EinfallIonenplattierte Kupferschichten wurden mittels Röntgenbeugung hinsichtlich Texturen und Eigenspannungen untersucht. Die vollständigen Orientierungsverteilungsfunktionen wurden bestimmt und scharfe (111)-Fasertexturen gefunden. Die Messung der Dehnungen erfolgte unter streifendem Strahleinfall. Zur Berechnung der Spannungstensoren wurden sowohl texturgewichtete elastische Moduln als auch texturunabhängige elastische Moduln verwendet. Die Bedeutung der Texturmessung für die Spannungstensorbestimmung wird diskutiert. Die gefundenen Spannungen können als thermisch verursacht verstanden werden.
    Notes: Ion-platted thin copper films were examined for residual stresses and texture by X-ray diffraction. The complete orientation distribution functions were determined and sharp (111)-fibre textures were found. The strains were measured by grazing incidence diffraction. The stress tensors were calculated using both texture-weighted elastic compliances and texture-independent X-ray elastic constants. The importance of the texture measurement for the stress tensor determination is discussed. The found stresses can be interpreted as thermally induced.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Advances in Polymer Technology 4 (1984), S. 51-60 
    ISSN: 0730-6679
    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
    Notes: Modern, trend-setting small injection molding machines should be designed so that they open up new applications to the plastics processor through utilization of microelectronics. In the sector of control, it would be equivalent to stagnation if only the familiar functions were realized with modern control circuits of a higher integration level and if the possibilities of these modules were not utilized to simplify operation, to expand the technological possibilities, and to illustrate the sequences of processes. The mechanical and hydraulic designs should be adjusted to these requirements.The design and extent of the electronic control system should be such as to ensure an economically reasonable relation between extra price and additional benefit - a basic requirement for offering standard supplies.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
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    In:  Other Sources
    Publication Date: 2011-08-17
    Description: The Viking biological investigation has tested four different hypotheses regarding the possible nature of Martian organisms. While significant results were obtained for each of these, tests of three of the hypotheses appear to indicate the absence of biology in the samples used, while the fourth is consistent with a biological interpretation. The original assumptions for each experiment and the experimental procedures that were utilized to test these assumptions are reviewed.
    Keywords: SPACE BIOLOGY
    Type: Journal of Geophysical Research; 82; Sept. 30
    Format: text
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  • 5
    Publication Date: 2011-08-18
    Description: (Previously announced in STAR as N81-32831)
    Keywords: LIFE SCIENCES (GENERAL)
    Format: text
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  • 6
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    In:  Other Sources
    Publication Date: 2011-08-17
    Description: The three biological experiments on board the Viking Mars Landers are discussed. The gas exchange experiment provided periodic measurements of the composition and quantity of gases from Martian surface material, either in a humid or a wet nutrient sampling mode. The labeled release experiment demonstrated that adding an aqueous solution of dilute radioactive compounds to Martian material caused a rapid release of labeled gas. The results of the pyrolytic release experiment remain difficult to interpret. Data from the first two experiments suggest that oxidants (including H2O2 and iron oxide) rather than biota may account for all the observed reactions.
    Keywords: SPACE BIOLOGY
    Type: Icarus; 34; June 197
    Format: text
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  • 7
    Publication Date: 2011-08-18
    Description: The stability of particulate palmitoyl-CoA desaturase preparations from anaerobically grown yeast cells was increased by exposure to low levels of oxygen. The stabilizing effect of oxygen may be based upon the increased amounts of palmitoleic acid and ergosterol that become available to the cells. These results suggest the evolutinary appearance of this system at a time when atmospheric oxygen was at a low level.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Origins of Life (ISSN 0302-1688); 13; March 19
    Format: text
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  • 8
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    In:  Other Sources
    Publication Date: 2011-08-17
    Description: The paper discusses some of the constraints pertaining to the Viking mission for detection of life on Mars, within which the Viking experiments were conceived, designed, and developed. The most important limitation to the entire study is the complete information about the nature of Mars, such as the chemical composition of the surface material of Mars and the exact identification of the constituents of that planet. Ways in which celestial mechanics places severe limitations on the Viking biology investigation are discussed. Major engineering constraints are examined relative to the accomodation of biology instrument inside the Viking lander and to the design of the instrument itself. Other constraints discussed concern the operational aspects of the mission and the testing program.
    Keywords: SPACE BIOLOGY
    Type: Origins of Life; 7; Aug. 197
    Format: text
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  • 9
    Publication Date: 2011-08-16
    Description: The activity and stability of the palmitoyl-coenzyme A (CoA) desaturase complex of Saccharomyces cerevisiae was influenced by several factors. Cells, grown nonaerobically and then incubated with glucose, either in air or under N2, showed a marked increase in desaturase activity. Cycloheximide, added during such incubations, prevented the increase in activity, suggesting de novo synthesis. The stability of the desaturase from cells grown nonaerobically was affected by subsequent treatment of the cells; enzyme from freshly harvested cells, or from cells that were then shaken under nitrogen, readily lost activity upon washing or during density gradient analysis, whereas aerated cells, in the presence or absence of glucose, yielded stable enzyme preparations. The loss of activity in nonaerobic preparations could be reversed by adding soluble supernatant from these homogenates and could be prevented by growing the cells in the presence of palmitoleic acid and ergosterol, but not with several other lipids tested.
    Keywords: LIFE SCIENCES (GENERAL)
    Type: Journal of Bacteriology; 124; Nov. 197
    Format: text
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  • 10
    Publication Date: 2011-08-16
    Description: The scientific payload on the Viking Mars landers is described. Shortly after landing, two facsimile cameras capable of stereoscopic imaging will scan the landing site area in black and white, color, and infrared to reveal gross evidence of past or present living systems. A wide range mass spectrometer will record a complete mass spectrum for soil samples from mass 12 to mass 200 every 10.3 sec. Three experiments based on different assumptions on the nature of life on Mars, if it exists, will be carried out by the bio-lab. A pyrolytic release experiment is designed to measure photosynthetic or dark fixation of carbon dioxide or carbon monoxide into organic compounds. A labelled release experiment will test for metabolic activity during incubation of a surface sample moistened with a solution of radioactively labelled simple organic compounds. A gas exchange experiment will detect changes in the gaseous medium surrounding a soil sample as the result of metabolic activity. The hardware, function, and terrestrial test results of the bio-lab experiments are discussed.
    Keywords: SPACE BIOLOGY
    Type: Nature; 262; July 1
    Format: text
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