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Leaves spirally arranged

Figure 8-12. (a) The scattered leaf arrangement (phyllotaxis) of Plantago media (drawing by Ferenc Lantos, Pecs). Fibonacci numbers of spirals in the patterns of (b) Scales of a pinecone and (c) A cactus in Hawaii (b and c, photographs by the authors). [Pg.384]

Phyllotaxy.—Phyllotaxy is the study of leaf arrangement upon the stem or branch, and this may be either alternate, opposite, whorled, or verticillate, or fascicled. It is a general law in the arrangement of leaves and of all other plant appendages that they are spirally disposed, or on a line which winds around the axis like the thread of a screw. The spiral line is formed by the union of... [Pg.156]

Within a few years of the invention of the L-S membrane, development of the RO membrane modules technique was reaHsed. Haven and Guy developed tubular RO membranes in the mid-1960s. In the late 1960s, Westmoreland and later Bray invented the spiral-wound module, which was more efficient than the tube-in-sheU module. The spiral-wound membrane can be viewed as a plate-and-frame (PAF) arrangement that has been rolled up. The original module had a single leaf of membrane whereas modem spiral-wound modules contain multi-leaf membranes. [Pg.5]


See other pages where Leaves spirally arranged is mentioned: [Pg.74]    [Pg.157]    [Pg.125]    [Pg.236]    [Pg.49]    [Pg.325]    [Pg.196]    [Pg.156]    [Pg.273]    [Pg.385]    [Pg.392]    [Pg.94]    [Pg.350]    [Pg.355]    [Pg.420]    [Pg.629]    [Pg.278]    [Pg.16]   
See also in sourсe #XX -- [ Pg.383 ]




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