An Introduction to Biological Rhythms - download pdf or read online

By John D. Palmer

ISBN-10: 0125444508

ISBN-13: 9780125444507

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By John D. Palmer

ISBN-10: 0125444508

ISBN-13: 9780125444507

Show description

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Extra resources for An Introduction to Biological Rhythms

Example text

Quant. Biol. 2 5 , 1 4 5 - 1 4 8 (1960). a r r a n g e m e n t , t h e p l a n t cell c a n b e e a s i l y e n u c l e a t e d b y c u t t i n g off t h e b a s a l tuft o f r h i z o i d s . B i o l o g i s t s — c y t o l o g i s t s i n p a r t i c u l a r — h a v e s y s t e m a t i c a l l y e x p l o i t e d t h i s p l a n t i n e x p e r i m e n t s d e s i g n e d to e l u c i d a t e t h e r o l e o f t h e n u c l e u s i n t h e life o f t h e cell. W h e n t h i s p l a n t i s p l a c e d i n a l t e r n a t i n g c y c l e s o f l i g h t a n d d a r k n e s s , it i s f o u n d to d i s play a r h y t h m in p h o t o s y n t h e s i s , o n e w h i c h will persist even in e n u c l e a t e d cells for as l o n g as 4 0 d a y s i n c o n t i n u o u s d i m i l l u m i n a t i o n (Figure 2 - 5 ) .

L i g h t : (i) t h e c l o c k h a s b e e n s t o p p e d ; o r (ii) all t h e i n d i v i d u a l s i n t h e population continue to b e r h y t h m i c , but the peaks of each one's r h y t h m c o m e s o u t o f p h a s e w i t h its n e i g h b o r , w h i c h c a n c e l s o u t t h e unified cycle display of the population. T o distinguish b e t w e e n these t w o p o s s i b i l i t i e s , t h e p h o t o s y n t h e t i c r a t e o f a s i n g l e Gonyaulax cell was measured in a sensitive Cartesian-diver microrespirometer.

12. T h e u n i c e l l u l a r level o f o r g a n i z a t i o n i s sufficient for t h e e x pression of rhythms. 13. I n i n d i v i d u a l o r g a n i s m s — b o t h u n i c e l l u l a r a n d m u l t i c e l l u l a r — t h a t d i s p l a y m o r e t h a n o n e r h y t h m i c p r o c e s s , it is n o t k n o w n w h e t h e r all t h e r h y t h m s a r e d r i v e n b y o n e m a s t e r c l o c k , o r i f e a c h r h y t h m h a s its o w n clock. C e r t a i n l y , all t h e cells i n a m u l t i c e l l u l a r organism have clocks, since isolated fragments from both plants and animals c o n t i n u e to display r h y t h m s w h i l e g r o w n in culture.

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An Introduction to Biological Rhythms by John D. Palmer


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