Physiology of Ticks. Current Themes in Tropical Science by Frederick D. Obenchain PDF

By Frederick D. Obenchain

ISBN-10: 008024937X

ISBN-13: 9780080249377

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Modifications to Cuticle Structure during Feeding A r t h r o p o d e c t o p a r a s i t e s , in g e n e r a l , a r e c a p a b l e of i n g e s t i n g l a r g e q u a n t i t i e s of fluid a n d a r e a n a t o m ically a d a p t e d in o n e w a y o r a n o t h e r to a c c o m m o d a t e i n c r e a s e s in b o d y v o l u m e o v e r o n e o r m o r e o r d e r s of m a g n i t u d e . I n s o m e i n s t a n c e s , for e x a m p l e , t h e b l o o d - s u c k i n g r e d u v i i d R.

T h e r e a p p e a r e d to b e a c o n t i n u o u s p r o c e s s of r e m o v a l a n d d e p o s i t i o n of l i p i d . D a v i s d i d n o t identify a n y of t h e lipid c o m p o n e n t s , b u t followed c h r o m a t o g r a p h i c a l l y t h e c h a n g e s in t h e n e u t r a l a n d p o l a r classes of l i p i d s e x t r a c t e d b y w a s h i n g live ticks in c h l o r o f o r m - m e t h a n o l . C h e r r y ( 1 9 6 9 a ) h a s identified c h o l e s t e r o l a m o n g t h e l i p i d s in h e x a n e w a s h i n g s of r e c e n t l y killed f e m a l e B.

T h i s i m p l i e s t h a t s o m e of t h e u n d e r l y i n g i n n e r e n d o c u t i c l e d i f f e r e n t i a t e s i n t o o u t e r e n d o c u t i c l e d u r i n g t h e first p h a s e of g r o w t h o r t h a t a m e c h a n i s m exists for s e c r e t i o n of c u t i c u l a r m a t e r i a l from t h e u n d e r l y i n g e p i d e r m i s a n d its d e p o s i t i o n b e t w e e n e x i s t i n g l a y e r s of o u t e r a n d inner endocuticle. T h e latter possibility raises some f u n d a m e n t a l biological q u e s t i o n s s i n c e , in t h e l a t e r p h a s e s , a n i n n e r e n d o c u t i c l e of s o m e 4 0 μ π ι in t h i c k n e s s is i n t e r p o s e d b e t w e e n t h e e p i d e r m i s a n d t h e o u t e r e n d o c u t i c l e .

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Physiology of Ticks. Current Themes in Tropical Science by Frederick D. Obenchain


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