Focus on Bacteria by Emmy Klieneberger-Nobel

By Emmy Klieneberger-Nobel

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R o b i n o w ( 1 9 5 6 ) . Bad. Rev. 20, 207. T h i s p h o t o g r a p h g i v e s a g o o d i m p r e s s i o n o f c e l l d i v i s i o n d u r i n g a c t i v e g r o w t h . T h e o u t e r c e l l - w a l l s ( A ) a p p e a r b l a c k ; t h e t r a n s v e r s e s e p t a (B) o f t h e d i v i d i n g cells s h o w u p i n v a r y i n g s h a d e s o f b l a c k n e s s . M a g n i f i c a t i o n : c. X 4 5 0 0 . 4· BACTERIAL ANATOMY 39 In Fig. 20 the main parts of a bacterial cell are drawn diagrammatically.

K l i e n e b e r g e r - N o b e l ( 1 9 5 1 ) . J. gen. Microbiol. 5, 5 2 5 . T h e spirals a n d s p h e r o p l a s t s w h i c h h a v e d e v e l o p e d u n d e r t h e i n f l u e n c e o f 0-05 % g l y c i n e a r e seen u n d e r t h e p h a s e - c o n t r a s t m i c r o s c o p e . T w o e n t w i n e d spirals a r e seen at A , t w o s p h e r o p l a s t s at B . M a g n i f i c a t i o n : χ 2500. 4· BACTERIAL ANATOMY 51 found that in the lysed Caulobacter bacteria only the empty cell-wall cases and the stalks remain.

Here the bacterium is seen white and unstained in F I G . 14. Pneumococcus, type I I I . R e p r o d u c e d from E . K l i e n e b e r g e r - N o b e l (1948). Schweiz- Ζ- P a -t h 1 > 3 3 6 · T e h d a r k l y s t a i n e d b a c t e r i a s t a n d o u t f r o m t h e w e l l - s t a i n e d c a p ­ sules. T h e s l i m e w h i c h s u r r o u n d s t h e c a p s u l a t e d b a c t e r i a c a n b e d e t e c t e d i n s o m e p l a c e s i n the p i c t u r e as i n d i c a t e d b y t h e a r r o w s .

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