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By H. W. Woolhouse

ISBN-10: 012005910X

ISBN-13: 9780120059102

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1980). (iv) There may be regions of the thylakoid membrane where one photosystem predominates almost to the exclusion of the other (Anderson and Anderson, 1980). C). ~~ A possible explanation of these recent findings may eventually be found in terms of the need for a flexible light harvesting apparatus in algae living under a very variable light climate (Section IX), but no widely accepted viewpoint has emerged at present. Clearly an important and related consideration is the proportion of membrane occupied by light harvesting and photosystem complexes in relation to other electron transport components.

At low concentrations of pigment both per cent absorption or absorptance are nearly directly proportional to concentration but at high concentration, while absorbance is still directly proportional to pigment concentration, per cent absorption approaches an asymptote (Fig. 16). For Chl a, this means that even at relatively low concentrations there is high per cent absorption for the blue and red absorption peaks. Thus an increase in Chl a to the level found in normal algal cells results in little change in per cent absorption in the peak regions but results in large changes in the green and yellow spectral regions (see Fig.

A large proportion of the thylakoid membranes are appressed, and as many as 20 thylakoids may be stacked together. This is particularly marked in the Prochloron sp. from Didemnum molle (Fig. 12) (Cox and Dwarte, 1981). The thylakoid membrane in unstacked regions is about 8-10 nm in thickness. The thylakoids may be separated by much cytoplasm in unstacked regions. In stacked regions thylakoids are separated by less than 1 nm at most, to form a fused double layer of about 15 nm thickness. (c) Green algal phyla.

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Advances in Botanical Research, Vol. 10 by H. W. Woolhouse

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