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  • Articles  (27)
  • 1970-1974  (27)
  • Process Engineering, Biotechnology, Nutrition Technology  (14)
  • Geography  (13)
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  • Articles  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    THE ECONOMICS OF AIR TRAVEL GRAVITY MODELS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of regional science 10 (1970), S. 0 
    Details
    ISSN: 1467-9787
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: Starting with the aggregate demand model of economics, a model of demand for intercity air travel is developed which contains the gravity model as a less general submodel. The more general model is referred to as the alternative opportunities model since it takes account of alternative destinations open to travelers, not just origin and destination as does the gravity model. The demand model approach has the virtue of providing a theoretical basis for understanding and analyzing the gravity model.The gains from treating alternative locations and demand motivation variables are a substantial increase in explanatory power over that yielded by the gravity model, the identification of statistically significant determinants of air travel, and better measurement of the coefficients of population and distance by taking account of these other variables and somewhat better forecasts.A shortcoming of procedures used here is aggregation of air trips with different purposes and thus lack of clear specification of the size of effects of different variables on different types of travel. Overcoming this difficulty must await origin-destination data listed by trip purpose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-9787.1970.tb00057.x
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  • 2
    Electronic Resource
    Electronic Resource
    Gymnemic acid, the antisaccharine principle of Gymnema sylvestre. Isolation and heterogeneity of gymnemic acid A1 (1973)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 21 (1973), S. 899-903 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60189a030
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  • 3
    Electronic Resource
    Electronic Resource
    Herbicide residues in air-cured burley tobacco (1974)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 22 (1974), S. 82-86 
    Details
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jf60191a026
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  • 4
    Electronic Resource
    Electronic Resource
    DEMAND IN SPACE: SOME NEGLECTED ASPECTS (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Papers in regional science 27 (1971), S. 0 
    Details
    ISSN: 1435-5957
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1435-5597.1971.tb01504.x
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  • 5
    Electronic Resource
    Electronic Resource
    Heat of mixing and vapor-liquid equilibrium of acetophenone-2-butanol system (1973)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 18 (1973), S. 262-263 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60058a016
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  • 6
    Electronic Resource
    Electronic Resource
    A Model for Glucose Metabolism in Man (1971)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 10 (1971), S. 2-12 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i160037a002
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  • 7
    Electronic Resource
    Electronic Resource
    PYROGLUTAMYL DIPEPTIDES IN MUSHROOM, AGARICUS CAMPESTRIS (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 35 (1970), 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: SUMMARY: A small fraction, containing evidence for the presence of pyroglutamyl dipeptides and an N-pyroglutamylhexosamine. was isolated from the edible, commercial mushroom. Agaricus campestris. Upon hydrolysis, this isolate liberated a copious amount of glutamic acid, together with smaller quantities of other amino acids and a hexosamine. Analyses of the unhydrolyzed and hydrolyzed portions of the fraction by an automatic amino acid analyzer revealed the identities and quantities of the compounds released. Additional chemical and physical methods of analysis gave supporting evidence for the presence in the mushroom in addition to proline and pyroglutamic acid of the pyroglutamyl dipeptides of threonine, aspartic acid, valine, leucine, citrulline, phenylalanine, glycine, alanine, glutamic acid and proline and also of the amino acid sugar, N-pyroglutamylglucosamine. Pyroglutamylcitrulline and N-pyroglutamylglucosamine were tentatively identified. The first 6 dipeptides are reported for the first time. A mechanism is proposed for the enzymic biosynthesis of the pyroglutamyl dipeptides in the mushroom. Results of the present work shed additional light on the complex nature of the higher basidiomycetes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1970.tb12122.x
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  • 8
    Electronic Resource
    Electronic Resource
    Demand in space: Some neglected aspects (1971)
    Springer
    Papers in regional science 27 (1971), S. 45-60 
    Details
    ISSN: 1435-5957
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Economics
    Notes: Summary This paper delves into a more explicit analysis of demand in space than has been undertaken heretofore. Utility theory is used to develop the concepts of spatial income-distribution effect, spatial-induced income effect, and spatial substitution effect, the effects on demand of changes or differences in location. Indifference curve analysis is employed to give a graphical interpretation to these concepts. The use of this general approach to demand in space makes it apparent that the usual assumption of uniform partial demand curves is logically inconsistent in a spatial context. An assumption of spatial homogeneity of general demand functions and of income distribution is found to imply (1) generally nonidentical partial demand curves at different points in space, and thus that the existence of the demand cone requires special conditions, (2) cases where purchases may rise with increasing distance from the mill, (3) the lack of independence among the ranges of different goods, and (4) nonuniformity in the size of ranges for a given good (a) sold at different centers and (b) sold in different directions from one center. Further work on this topic is indicated along the lines of loosening the many restrictions imposed during the analysis. Two-dimensional rather than the linear markets, discriminatory f.o.b. or equalized delivered pricing rather than nondiscriminatory f.o.b. pricing, and a transportation system with limited rather than ubiquitous access are some cases in point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01954599
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  • 9
    Electronic Resource
    Electronic Resource
    Air travel, spatial structure, and gravity models (1970)
    Springer
    The annals of regional science 4 (1970), S. 97-107 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294893
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  • 10
    Electronic Resource
    Electronic Resource
    Distance, intervening opportunities, city hierarchy and air travel (1971)
    Springer
    The annals of regional science 5 (1971), S. 152-161 
    Details
    ISSN: 1432-0592
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geography , Economics
    Notes: Summary and Conclusions This study examines the influence of the spatial structure of city locations on air travel by considering the factors of intervening opportunities and the hierarchical system of cities in addition to the simple dimension of distance. The statistical results show that the familiar strength of the gravity model is matched by that of the intervening opportunities model, but only when all cities are analyzed together. The disaggregation of cities by size and region (hierarchy) leads to a spotty performance by both models. The generality of the gravity and intervening opportunities models is thus called into question, and the potency of the hierarchical city organization as a contributing influence determining air traffic flows is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288120
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