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Intergradation among Latin American maize based on an analysis of chromosome knob frequencies (1984)

Hanson, W. D.

Springer

Theoretical and applied genetics 68 (1984), S. 347-354

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ISSN: 1432-2242

Keywords: Zea mays (L.) ; Corn ; Diversity ; Migration ; Chromosome knobs ; Germplasm ; Intergradation ; Pollen drift

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary Published information on chromosome knobs found at 21 knob-forming positions and on abnormal 10 and B chromosomes in maize, Zea mays L., was used to place maize populations within a multidimensional space based on frequencies. From this space, similarities among populations were determined using a measure of gentic diversity based on a modified Cartesian distance. Populations were portrayed in 2 (or 3) dimensions based on these distances. The objective was to investigate patterns of “migration” that had occurred among indigenous populations of maize from Latin America. Widely dispersed collections classified as Tuxpeño had similar knob constitutions. Collections from Guatemala reflected continuous migration among adjacent areas with increased isolation (or association of knob types) with increased altitude of collection. Maize from southeastern Guatemala and their southeastern neighbours were similar. The high elevation collections from Guatemala and Mexico were surprisingly similar. The data reflected three distinct phenomena: long-term intergradation of maize germplasm among adjacent areas (as would result from pollen drift between closely cultivated areas or from seed exchange among neighbors), major, relatively recent shifts in gene flow (as had occurred with Tuxpeño's widespread distribution in Mexico), and precolonial dispersions (as between maize populations from the high elevations in Guatemala and Mexico).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00267888

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Numerical modelling of wind flow over buildings in two dimensions (1984)

Hanson, T. ; Summers, D. M. ; Wilson, C. B.

Chichester : Wiley-Blackwell

International Journal for Numerical Methods in Fluids 4 (1984), S. 25-41

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ISSN: 0271-2091

Keywords: Architectural Wind-flow ; Environmental Problems ; Random Vortex Method ; Control Volume Method ; Engineering ; Engineering General

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Numerical solutions to the Navier-Stokes equation may provide designers with predictions of the wind environment of buildings under design. To investigate this possibility, two complementary solution procedures are implemented for two-dimensional geometry: a random vortex method to depict the flow evolution, and a control volume method to depict the steady flow field. These are both illustrated by specific application to the case of a building form with a roof of arbitrary pitch.

Additional Material: 5 Ill.