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W . D E A M E R A N D R. L E O N A R D Summary ο Muscle microsomes c o n t a i n p a r t i c l e s 70-90 A i n d i a m e t e r which may be v i s u a l i z e d by f r e e z e - e t c h i n g . The e s t i m a t e d m o l e c u l a r w e i g h t and d i s t r i b u t i o n o f the p a r t i c l e s c o r r e ­ sponds t o i n d e p e n d e n t e s t i m a t e s of t h e m o l e c u l a r w e i g h t and d i s t r i b u t i o n of an ATPase enzyme i n the microsomes a s s o c i ­ ated with calcium t r a n s p o r t .

F r a c t u r e f a c e s o f f r o z e n membranes. Proc. N a t . A c a d e . S c i . ( U . S . ) 55:1048-1056 ( 1 9 6 6 ) . 29 D. W . D E A M E R A N D R. L E O N A R D 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. W. and D. B r a n t o n . F r a c t u r e p l a n e s i n an i c e b i l a y e r model membrane s y s t e m . S c i e n c e 158:655-657 (1967). Deamer, D . W . , R. L e o n a r d , A . T a r d i e u and D. B r a n t o n . L a m e l l a r and h e x a g o n a l l i p i d phases v i s u a l i z e d by f r e e z e etching.

W i t h i n a narrow r a n g e o f l y s o l e c i t h i n c o n c e n t r a t i o n , some o f t h e membrane p r o t e i n c o n t a i n i n g ATPase a c t i v i t y forms v e s i c l e s o f s m a l l e r d i a m e t e r than t h e o r i g i n a l microsomes. F r e e z e - e t c h i n g o f the v e s i c l e s r e v e a l s the par­ ticles. The d a t a s u p p o r t s the s u g g e s t i o n t h a t t h e p a r t i c u ­ l a t e s t r u c t u r e s on muscle microsomes r e p r e s e n t s i t e s of ATPase a c t i v i t y ( 2 4 ) , and i s i n a c c o r d w i t h t h e r e s u l t of Maclennan et al.

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