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By T. Kent Kirk

This publication contains sixty eight co-ordinated chapters by way of specialists from 25 international locations. The chapters have been chosen from the complaints of the Fourth overseas Sympsoium on biotechnology within the pulp and paper undefined. Biotechnology is swiftly expanding the creation, caliber and availability of many items whereas reducing their expenditures and this ebook summarize power purposes

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Uncollapsed stiff fibers (a) contributing to poor bonding (b). 24: NSSC handsheet. Uncollapsed stiff fibers (a). 25: K R A F T handsheet. Good bonding (c) due to good fiber collapse and compressability (d). 26: BMP handsheet. Good bonding (c) due to good fiber collapse and compressability (d). 4 DISCUSSION T h e ultrastructural results o b t a i n e d w i t h t h e s c a n n i n g electron m i croscope h a v e h e l p e d improve our u n d e r s t a n d i n g of t h e progression of P. chrysosporium h y p h a e a n d its modification of a s p e n w o o d chips during a 3-week p r e t r e a t m e n t before mechanical pulping.

1 4 ) . 15) showed r e d u c e d fibrillation, debris, a n d stiff fibers of various l e n g t h s . 16, 3 . 1 7 ) . T h e s e fibers were m o r e t w i s t e d t h a n t h e B M P fibers. 18) for t h e m o s t part e x h i b i t e d fewer stiff fibers of various l e n g t h s , w i t h m o r e c o m p r e s s ibility a n d conformability w h e n c o m p a r e d t o t h e m e c h a n i c a l l y processes p u l p s . C o m p a r e d t o B M P , N S S C p u l p fibers were n o t as c o m p r e s s e d a n d m o r e variable in l e n g t h .

Uncollapsed stiff fibers (a) contributing to poor bonding (b). 24: NSSC handsheet. Uncollapsed stiff fibers (a). 25: K R A F T handsheet. Good bonding (c) due to good fiber collapse and compressability (d). 26: BMP handsheet. Good bonding (c) due to good fiber collapse and compressability (d). 4 DISCUSSION T h e ultrastructural results o b t a i n e d w i t h t h e s c a n n i n g electron m i croscope h a v e h e l p e d improve our u n d e r s t a n d i n g of t h e progression of P. chrysosporium h y p h a e a n d its modification of a s p e n w o o d chips during a 3-week p r e t r e a t m e n t before mechanical pulping.

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