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  • 1
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    An Experiment in Cooperative Agriculture: The Rice Communities of the Po River Delta (1963)
    Macomb, Ill., etc. : Periodicals Archive Online (PAO)
    Journal of Geography. 62:7 (1963:Oct.) 310 
    Details
    ISSN: 0022-1341
    Topics: Geography
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1129-1963-062-07-000004
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  • 2
    Electronic Resource
    Electronic Resource
    An implicit enumeration approach to tolerance allocation in sequential tolerance control (1999)
    Springer
    IIE transactions 31 (1999), S. 75-84 
    Details
    ISSN: 1573-9724
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The accuracy and precision of a manufactured dimension is largely dependent on the accuracy and precision of the technological processes selected for its execution. It is not unusual to have available several competing technological processes for execution of each manufacturing operation specified in a process plan, where it is generally assumed that as the precision of the technological process improves, the associated cost and yield of the operation increase. This paper presents an implicit enumeration approach to the selection of an optimum subset of technological processes required to execute a process plan under a sequential (or adaptive) tolerance control strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007528802530
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  • 3
    Electronic Resource
    Electronic Resource
    Computer simulation of the directional displacement of rod-shaped, arc-shaped, and circular objects in an array of obstacles, representing a simple model for the gel electrophoresis of small DNA (1995)
    New York : Wiley-Blackwell
    Biopolymers 35 (1995), S. 179-185 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The gel electrophoresis of DNA of identical length but various static conformations was simulated using a two-dimensional model of the movement of rod-shaped, arc-shaped, and circular objects through random arrays of disk-shaped obstacles. At low obstacle density, the displacement rate of these objects decreases from the rod-shaped to the circular to the arc-shaped objects. At high obstacle densities, the displacement rate of circular objects approaches zero. The alignment of the arc-shaped objects along the axis of the directional movement of the objects was less than that achieved by the rod-shaped objects. Rod-shaped and arc-shaped objects were retarded in their movement by collisions with the obstacles; the number of collisions of the former, in view of their greater ability to align, was less than that of the latter. Circular objects were exclusively retarded by collisions, while the arc-shaped objects exhibited an additional retarding mechanism, viz. the suspension (“hanging”) on the obstacles. When the rigid objects were made flexible, their displacement increased. The increase was most pronounced with the circular objects, allowing them to penetrate at obstacle densities from which the rigid objects were excluded. © 1995 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360350206
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  • 4
    Electronic Resource
    Electronic Resource
    Capabilities and potentialities of transverse pore gradient gel electrophoresis (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 1021-1027 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Transverse pore gradient gel electrophoresis is important as a tool for obtaining nonlinear Ferguson plots [log(mobility) vs. gel concentration], e.g. in application to DNA in polyacrylamide gels or to agarose gels, with the purpose of evaluating molecular properties (size, conformation, malleability) and gel fiber properties (fiber radius and length per unit volume). To date, it is capable of (i) yielding gel patterns (“Ferguson curves”) of migration distance vs. predicted % T-range of the pore gradient, assuming its linearity;(ii) yielding information regarding molecular conformation from the intersection of Ferguson curves of unknowns (e.g. bent DNA) with those of standards; (iii) acquisition of Ferguson curves by computer, using prototype instrumentation; (iv) mathematical manipulation of acquired Ferguson curves to yielding Ferguson plots, providing that mobility in free solution has been assessed by capillary zone electrophoresis. The potentialities of the method remain unfulfilled to date due to (i) the unavailability, with a single exception, of an accurate and precise way to produce pore gradients of known shape; (ii) unavailability of a routinely applicable analysis for % T; (iii) unvailability of optimized, user-friendly and foolproof instrumentation for computer acquisition of Ferguson curves, including the present inapplicability of a commercially available electrophoresis apparatus with intermittent optical detection to transverse pore gradient gels; and (iv) unresolved problems in the statistical evaluation of Ferguson curves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501501152
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  • 5
    Electronic Resource
    Electronic Resource
    Transverse pore gradient gel electrophoresis, using the PhastSystem (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 1028-1031 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: The application of pore gradient gels prefabricated for the PhastSystem (Pharmacia) to transverse pore gradient gel electrophoresis is demonstrated. It has the twofold advantage of (i) horizontal positioning, avoiding gel stretching during the preparation of these gels and resulting pore size irreproducibility experienced with vertically applied pore gradient gels, which necessitate an orthogonal transfer of spacers, and (ii) miniaturized gel dimensions, which allow a small sample load and a short duration of electrophoresis and staining.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501501153
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  • 6
    Electronic Resource
    Electronic Resource
    A computer simulation accounting for dissimilar electrophoretic behavior between two similarly curved DNA fragments due to a difference in arc-length (1994)
    Weinheim : Wiley-Blackwell
    Electrophoresis 15 (1994), S. 885-889 
    Details
    ISSN: 0173-0835
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Arc-shaped bent DNA fragments of the same predicted planar curvature but differing in length by 20% were compared in regard to their mobilities in 3 to 10% polyacrylamide. The longer (155 bp) fragment is retarded far more severely than the shorter (124 bp) fragment. The effect of gel concentration in promoting the retardation is far more pronounced for the 155 bp than for the 124 bp fragment. Moreover, a temperature change from 25°C to 4°C does not substantially affect the gel concentration dependent mobility of the 124 bp fragment while it increases the retardation of the 155 bp fragment greatly. The strong increase in retardation brought about by a mere 20% increase in the length of the arc was accounted for by a simple computer simulation of gel electrophoresis which considered the rate of passage of arc-shaped objects through a two-dimensional array of disc-shaped obstacles. Since the simulation relies exclusively on geometric factors, its success in predicting the behavior of the 124 and 155 bp DNA fragments suggests that geometric factors are largely responsible for their electrophoretic properties. The simulation can account for the strong temperature effect on the retardation of a model of the 155 bp DNA in polyacrylamide gels by showing that a decreased degree of random motion has a profound effect on the modeled 155 bp particle, but not on the modeled 124 bp DNA.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.11501501126
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