Download PDF by Ferdinand Heinmets: Analysis of Normal and Abnormal Cell Growth: Model-System

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These experiments suggest that at the level of protein synthesis a very effective control can be exercised on total cell growth. Furthermore, a rather uniform response can be obtained on the level of all functional entities, which is essential for organized growth. The same cannot be said for control of 39 ANALYSIS OF THE GROWTH PROCESS growth via RNA pool P n. Since we are dealing here with a model-system, one cannot be too dogmatic in drawing conclusions. But it appears that a model-system as presented has a strong all-over cross-behavior of an efficiently selforganizing system.

The data are exhibited in Figs. 4. 0~--~----~----~--~----~----L---~----~--~ 0 2 Fig. 25. Shift-down experiment. 60%. 4 5 6 7 8 At time indicated by arrow, pool Pe is reduced The effect on: Ribosome B. transport RNA C, enzyme E, messenger M, and pool Pi. 0~--~----~----L---~----~----L---~----~--~ 0 2 3 4 5 6 7 8 Fig. 26. Same shift-down experiment as in Fig. 25. Theeffect on: Pools Pa and P 0 • analyze the interrelationships and sequence of events taking Here again the place during such drastic pool changes.

2la. The effect of k 20 on ribosome 8. the intermediate functional elements (complexes) were not adjusted for optimal performance. The model-system was still able to organize itself for growth. This indicates that the model-system has self-organizing characteristcs which are rather strong, and that it is able to adapt itself when transferred from one condition to another. However, since we were interested in studying the growth characteristics of individual functional elements in a more detailed manner in conditions which alter very rapidly, it was desirable that a further parameter adjustment be made, in order to reduce initial transients and ANALYSIS OF lHE GROWIH PROCESS 41 increase the useful observation time.

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