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  • 1
    Electronic Resource
    Electronic Resource
    Proteolytic Processing Mechanisms of a Miniprecursor of the Aspartic Protease of Human Immunodeficiency Virus Type 1 (1994)
    s.l. : American Chemical Society
    Biochemistry 33 (1994), S. 1248-1254 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00171a027
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  • 2
    Electronic Resource
    Electronic Resource
    Hexanal Formation via Lipid Oxidation as a Function of Oxygen Concentration: Measurement and Kinetics (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 56 (1991), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A system was developed to continuously quantify hexanal produced via lipid oxidation of oils at constant oxygen concentrations. Two kinetic models were derived from molecular mechanisms of oxidation to describe the initial (a cubic model) and accelerated (an extended model) stages of oxidation. The kinetic models illustrated the mechanistic influence of oxygen on rate constants and fit the data as well as simplistic curve fitting models. The monomolecular reaction phase showed the expected hyperbolic fit of inverse rate vs reciprocal oxygen concentration. The break point between initial and accelerated stages as function of oxygen concentration was represented by a logarithmic function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1991.tb05389.x
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  • 3
    Electronic Resource
    Electronic Resource
    USING the L NUMBER to PREDICT the EFFICACY of MOISTURE BARRIER PROPERTIES of EDIBLE FOOD COATING MATERIALS (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food processing and preservation 15 (1991), S. 0 
    Details
    ISSN: 1745-4549
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The L number, a dimensionless number that describes the ratio of the moisture permeance of a food substance to that of a coating material, was used to predict the effectiveness of available edible coating materials to prevent moisture migration from or into coated foods. A computer model was developed using the finite difference method to simulate moisture migration through coated food materials. the results indicated that when the L number is smaller than 0.04, the main resistance to moisture transfer for a coated food material is the diffusion of moisture within the food material itself. On the other hand, if the L number is larger than 4, the main resistance to moisture transfer is the permeance of the coating material. the application of this approach to predict the effectiveness of different coating materials for various dried foods is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4549.1991.tb00153.x
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative study of nitric oxide immission in the cities of Lyon, Geneva, and Stuttgart using a mobile differential absorption LIDAR system (1992)
    Springer
    Applied physics 54 (1992), S. 89-94 
    Details
    ISSN: 1432-0649
    Keywords: 06.70 Dn ; 07.60−j ; 33.20 Lg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The immission load of nitric oxide due to traffic is investigated in the cities of Lyon, Geneva, and Stuttgart using a mobile differential absorption LIDAR system (DIAL). Horizontal and vertical maps of the NO mixing ratio, as well as 24 hour records are presented. It is shown that street canyons favor high immission values, whereas broad main axes are efficiently ventilated (Lyon); inversion conditions rise the average immission load within a city mainly independent of traffic (Geneva and Stuttgart), whereas highly frequented intersections favor high immission values regardless of weather conditions (Geneva); the observed maximum immission loads also depend on the traffic density during rush hours (Stuttgart).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331739
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  • 5
    Electronic Resource
    Electronic Resource
    Editorial (1992)
    Springer
    Applied physics 55 (1992), S. 1-2 
    Details
    ISSN: 1432-0649
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348605
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  • 6
    Electronic Resource
    Electronic Resource
    The Seafloor Borehole Array Seismic System (SEABASS) and VLF ambient noise (1994)
    Springer
    Marine geophysical researches 16 (1994), S. 243-286 
    Details
    ISSN: 1573-0581
    Keywords: seismology ; seafloor ; borehole ; ambient noise
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The Seafloor Borehole Array Seismic System (SEABASS) has been developed to measure the pressure and threedimensional particle velocity of the VLF sound field (2–50 Hz) below the seafloor in the deep ocean. The system consists of four three-component borehole seismometers (with an optional hydrophone). a borehole digitizing unit, and a seafloor control and recording package. The system can be deployed using a wireline re-entry capability from a conventional research vessel in Deep Sea Drilling Project (DSDP) and Ocean Drilling Project (ODP) boreholes. Data from below the seafloor are acquired either onboard the research vessel via coaxial tether or remotely on the seafloor in a self-contained package. If necessary the data module from the seafloor package can be released independently and recovered on the surface. This paper describes the engineering specifications of SEABASS, the tests that were carried out, and preliminary results from an actual deep sea deployment. VLF ambient noise levels beneath the seafloor acquired on the Low Frequency Acoustic-Seismic Experiment (LFASE) are within 20 dB of levels from previous seafloor borehole seismic experiments and from land borehole measurements. The ambient noise observed on LFASE decreases by up to 12 dB in the upper 100 m of the seafloor in a sedimentary environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01224745
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  • 7
    Electronic Resource
    Electronic Resource
    The high-resolution crystal structure of porcine pepsinogen (1992)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 13 (1992), S. 1-25 
    Details
    ISSN: 0887-3585
    Keywords: aspartic proteinase zymogen ; molecular replacement ; structure-function ; activation peptide ; acid activation ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The structure of porcine pepsinogen at pH 6.1 has been refined to an R-factor of 0.173 for data extending to 1.65 Å. The final model contains 180 solvent molecules and lacks density for residues 157-161. The structure of this aspartic proteinase zymogen possesses many of the characteristics of pepsin, the mature enzyme. The secondary structure of the zymogen consists predominantly of β-sheet, with an approximate 2-fold axis of symmetry. The activation peptide packs into the active site cleft, and the N-terminus (IP-9P) occupies the position of the mature N-terminus (1-9). Thus changes upon activation include excision of the activation peptide and proper relocation of the mature N-terminus. The activation peptide or residues of the displaced mature N-terminus make specific interactions with the substrate binding subsites. The active site of pepsinogen is intact; thus the lack of activity of pepsinogen is not due to a deformation of the active site. Nine ion pairs in pepsinogen may be important in the advent of activation and involve the activation peptide or regions of the mature N-terminus which are relocated in the mature enzyme. The activation peptide-pepsin junction, 44P-1, is characterized by high thermal parameters and weak density, indicating a flexible structure which would be accessible to cleavage. Pepsinogen is an appropriate model for the structures of other zymogens in the aspartic proteinase family. © 1992 Wiley-Liss, Inc.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prot.340130102
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  • 8
    Electronic Resource
    Electronic Resource
    Eine Schnellmethode zur Bestimmung des Arsens in Schwefelsäure und Salzsäure (1915)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 54 (1915), S. 51-51 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01453129
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  • 9
    Electronic Resource
    Electronic Resource
    Testung von Adsorbentien für die Druckwechsel-Adsorption (1991)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 63 (1991), S. 866-867 
    Details
    ISSN: 0009-286X
    Keywords: Adsorption ; Test ; Druckwechsel ; PSA ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330630825
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  • 10
    Electronic Resource
    Electronic Resource
    Adsorptionsuntersuchungen an Organokieselsäurepolymeren (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 612 (1992), S. 137-142 
    Details
    ISSN: 0044-2313
    Keywords: Adsorption and swelling ; isothermes ; specific surfaces ; organosilicic acid ; double four-ring silicate units ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Adsorption Studies on Organosilic Acid PolymersWe present four organosilic acid polymers containing double-4-ring silicate units cross-linked at different degree by different organosilicon bridges. BET surfaces were determined and adsorption isotherms of n-hexane, benzene, nitrogen and water were measured. All polymers are hydrophobic, one of them behaves microporously, the other are unporous. With organic adsorptives, swelling and adsorption occur simultaneously. Possible relations of microporosity and structure are discussed.
    Notes: BET-Oberflächen und Isothermen von n-Hexan, Benzen, Wasser und Stickstoff wurden an vier Organokieselsäurepolymeren vermessen, die sich im Vernetzungsgrad der Doppelvierring-Kieselsäureeinheiten Si8O20 und in der Struktur der Brücken unterscheiden. Ein Polymere ist mikroporös, die anderen sind unporös. Alle Polymere verhalten sich hydrophob. Neben der Adsorption tritt Quellung bei der Einwirkung organischer Adsorptive auf. Die Zusammenhänge zwischen der Länge der Brücken und der Porosität werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926120123
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