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Books > Science & Mathematics > Biology, life sciences > Botany & plant sciences
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Progress in Botany 70 (Paperback, Softcover reprint of hardcover 1st ed. 2009)
Loot Price: R5,758
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Progress in Botany 70 (Paperback, Softcover reprint of hardcover 1st ed. 2009)
Series: Progress in Botany, 70
Expected to ship within 10 - 15 working days
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Time and change characterise the natural world, but in the
biological sciences, by comparison with spatial measurements, time
is a somewhat neglected parameter. Structural analyses of great
depth and elegance have taken our spatial understa- ing to atomic
dimensions, where distances are measured in A. To obtain temporal
measurements appropriate to this spatial scale, dynamics on an
attosecond time- 18 scale (10 s) are required in order to visualise
physico-chemical mechanisms (Baum and Zewail 2006). For certain
specific reactions of molecular components obtained from biological
sources (e. g. the formation of carboxyhaemoglobin by the
oxygenation of haemoglobin), probing of picosecond reactions are
important (Brunori et al. 1999). In plants, femtosecond lifetimes
of excited states of chlo- phyll are key to the photosynthetic
light reaction. These considerations underline the extreme range of
dynamic interactions that are necessitated for an understa- ing of
the living organism, for if we include the long history of
evolutionary change 9 (Fenchel 2002), an upper limit to our studies
would extend over about 3. 8 x 10 years (Fig. 1). When the dynamic
range of biological processes is to be considered, we must be aware
that the system as it performs in vivo is a heterarchy with
interactions of great complexity that occur, not merely within a
level but between levels, and often across widely-separated time
domains. The living state is better considered to be homeodynamic
rather than homeostatic (Yates 1992; Lloyd et al. 2001)."
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