HAL Id: jpa-00226245
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Submitted on 1 Jan 1987
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FISH GLYCOPEPTIDE AND PEPTIDE
ANTIFREEZES : THEIR INTERACTION WITH ICE AND WATER
P. Wilson, A. Devries
To cite this version:
P. Wilson, A. Devries. FISH GLYCOPEPTIDE AND PEPTIDE ANTIFREEZES : THEIR INTER- ACTION WITH ICE AND WATER. Journal de Physique Colloques, 1987, 48 (C1), pp.C1-673-C1-673.
�10.1051/jphyscol:19871104�. �jpa-00226245�
JOURNAL DE PHYSIQUE
C o l l o q u e C1, s u p p l 6 m e n t au n o 3 , T o m e 48, mars 1 9 8 7
FISH GLYCOPEPTIDE AND PEPTIDE ANTIFREEZES : THEIR INTERACTION WITH ICE AND WATER
P . W . WILSON and A . L . DEVRIES*
Physics University o f Otago, PO Box 56, Dunedin, New zealand
"University of Illinois, IL, U.S.A.
Abstract :
G l y c o p e p t i d e a n d p e p t i d e a n t i f r e e z e a g e n t s a r e present in t h e body fluids o f p o l a r fishes a n d allow t h e m t o a v o i d f r e e z i n g in ice-laden s e a w a t e r . T h e s e a n t i f r e e z e s l o w e r t h e f r e e z i n g point 200 t i m e s m o r e t h a n p r e d i c t e d by c o l l i g a t i v e r e l a t i o n s , but h a v e l i t t l e e f f e c t o n t h e m e l t i n g point of ice.
T h e y bind t o i c e a n d a p p e a r to i n h i b i t g r o w t h by i n c r e a s i n g t h e c u r v a t u r e o f g r o w t h s t e p s o n t h e i c e c r y s t a l s u r f a c e . Such a g r o w t h would r e s u l t in a s u b s t a n t i a l i n c r e a s e in t h e r o u g h n e s s of t h e . s u r f a c e of t h e c r y s t a l . L a s e r light s c a t t e r i n g t e c h n i q u e s h a v e b e e n used t o e v a l u a t e t h e d e p e n d e n c e on t e m p e r a t u r e of t h e s u r f a c e r o u g h n e s s a t t h e i c e l a n t i f r e e z e solution i n t e r f a c e .
R e s u l t s show a d r a m a t i c i n c r e a s e in s c a t t e r e d light a s t h e t e m p e r a t u r e i s . d e c r e a s e d t o w a r d t h e f r e e z i n g p o i n t of a n t i f r e e z e solutions.
COMMENTS
Remark o f J.W. GLEN :
We h a v e a l s o begun some work o n t h e e f f e c t o f t h e s e m a t e r i a l s o n t h e p h y s i c a l p r o p e r t i e s o f i c e . D. I v e s and I h a v e made c o m p r e s s i o n c r e e p t e s t s on r a n d o m l y o r i e n t e d p o l y c r y s t a l l i n e i c e i n w h i c h , f o r t h e d o p e d s p e c i m e n s , a n t i f r e e z e g l y c o p r o t e i n s s u p p l i e d by D. D e v r i e s were i n c l u d e d i n t h e w a t e r i n t r o d u c e d i n making t h e s p e c i m e n s f r o m f r o s t p a r t i c l e s . We a r e s t i l l a t a n e a r l y s t a g e , b u t i n a l l c a s e s t h e c r e e p r a t e o f t h e doped i c e is less t h a n t h a t o f p u r e i c e a n d n o a c c e l e r a t i o n o f t h e c r e e p h a s y e t b e e n s e e n o n o u r doped s a m p l e s w h e r e a s p u r e s a m p l e s showed a c c e l e r a t i o n . 1 s h o u l d e m p h a s i z e t h a t t h e s e a r e v e r y p r e l i m i n a r y r e s u l t s b a s e d o n t h e f i r s t f o u r doped s p e c i m e n s . T h e s e r e s u l t s a r e o f i n t e r e s t i n c o n n e c t i o n w i t h t h e r e p o r t by K n i g h t a n d D e v r i e s + t h a t a n t i f r e e z e g l y c o p r o t e i n s p r e v e n t g r a i n - b o u n d a r y m i g r a t i o n i n i c e a n d h e n c e may w e l l p r e v e n t dynamic r e c r y s t a l l i z a t i o n .
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