By D.F. Houlihan, D.R. Livingstone, R.F. Lee

Advances in Comparative and Environmental Physiology is helping biologists, physiologists, and biochemists preserve music of the broad literature within the box. offering complete, built-in stories and sound, severe, and provocative summaries, this sequence is a must for all energetic researchers in environmental and comparative physiology.

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19; McMillan and Houlihan 1988; Houlihan et al. 1989; Houlihan et al. 1990a,b). Tissues with high RNA to protein ratios generally have high fractional rates of protein synthesis. The RNA activity (k RNA ) can be calculated from the fractional rate of protein synthesis and the RNA to protein ratio and has units of g of protein synthesised per g of RNA per day. The kRNA values are significantly different between tissues within an animal and are different between species; they are lowest in the white muscle and highest in the liver in the trout and appear to be three times higher in octopus (Table 3).

Garlick et al. 1976). There is now evidence that this relationship is also true in ectotherms; in rainbow trout, crabs and octopus there are between 10- and lOO-fold differences in the RNA to protein ratios in the tissues and these ratios correlate strongly with tissue fractional rates of protein synthesis (Fig. 19; McMillan and Houlihan 1988; Houlihan et al. 1989; Houlihan et al. 1990a,b). Tissues with high RNA to protein ratios generally have high fractional rates of protein synthesis. The RNA activity (k RNA ) can be calculated from the fractional rate of protein synthesis and the RNA to protein ratio and has units of g of protein synthesised per g of RNA per day.

Houlihan support the conclusion reached from the whole animal results; synthesis rates are higher in Octopus compared with those in fish but degradation rates are considerably lower. g. Goldspink et al. 1984). The slow tonic, predominantly oxidative fibres in the leg of the crab Carcinus also have higher fractional rates of protein synthesis than the fast phasic, predominantly glycolytic muscle fibres (El Haj and Houlihan 1987). These wide differences between tissues rates of protein synthesis raise the question of the different proteins synthesised in different tissues.

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