[Tugindia] Running head with small case letters

[mkalidoss]

Dear All,
In the standard book class, the header consists of 
the chapter heading on odd pages and section heading 
on the even pages.  In both cases, the headings are in 
upper case.  The problem with a chapter heading which 
consists of a chemical compound like Ni, Fe or Cl, all 
the letters appear in upper case. 
Please help me to overcome this problem.   
Thanks in advance.

M. Kalidoss