β Scribed by Z. Bashir
No coin nor oath required. For personal study only.
The pre-oxidative stabiiisation of polyacrylonitrile (PAN) is a crucial step in the production of PAN-based carbon fibres. Much research has been devoted in the 19% and 1960s towards elucidating the reactions undergone by PAN during stabilisation. In the past, the mechanism of stabilisation was quite controversial, with much dispute about crosslinking and cyclisation. Now, cyclisation with the formation of six-membered rings seems to have become accepted, though the evidence still remains circumstantial. Alternative interpretations of the changes occurring during stabilisation are also discussed. The possibility of base-induced cyclisation in solution is reviewed along with other pre-treatments for speeding up stabilisation.
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Isolated testicular relapse (T.R.) in acute lymphoblastic leukemia (ALL) has an overall incidence of 10% and affects mainly patients off therapy. Multivariate analysis of pretreatment characteristics has shown that lymphadenopathy and splenomegaly are independently associated with increased risk of
## Abstract ## Background Anxiety reactions and panic attacks are the acute symptoms most frequently associated with cannabis use. Understanding the relationship between cannabis and anxiety may clarify the mechanism of action of cannabis and the pathophysiology of anxiety. Aims of the present stu