17. 



which liii r P^°^-:^^y ^'-^- typ. of trip! 3 junction 

 whichwill form most rs-'^.dily in naturo. b^causo if 



thev wn,nT>;^'^'; "'''2- groups W3re introducad 

 they would have too much f r -dom of mov 3m 3nt to 

 produce the triple junction spontaneously. Hydro- 

 carbon chains will not react with 3ach oth^r ^f 

 they are capable of movement at random in any^ 



wnnTr^""'''.^''? ^^^^ '" ^^^^ ^^' condition which 

 would exist at any point biyond th3 gamma carbon 



-^A. "^^* 2" "^^^ 0th 3r hand, we omit some of th - 

 xntarmediate-GHg-^- groups and attempt to form the 

 triple junc-:ion at the b3ta carbon atom th - 

 spirals will have to b3 brought so cl.os3 togeth-r 

 that there would probably be considerable repul- 

 sion betwaen them due to th 3rmal vibration of th - 

 atoms. Such a triple junction could prooably not 

 form spontaneously unl 3ss the spirals were crowded 

 together from the outsida, but the prssence of 

 substances like iso-leucins and valine ^Tiong th - 

 decomposition products of proteins seems to show 

 tnat triple junctions of the beta tyiDe do occur 

 at times. 



The existence of both beta and g=^mma junc- 

 tions in the same prot 3in is indicated by the 

 occurrence among protein decomposition products 

 of^ substar.ces like val yl -1 eucin 3 which contains 

 a beta junction at one end nf the rnol ecul 3 and 

 a g^mma junction at the other end. 



If W3 connect togeth3r a lar/^3 numb 3r of 

 spirals by means of triple junctions of eith sr 

 the beta or ths gamma type, th ay will form 

 coll ectiv sly a cluster of hexagonal compartments. 



