(introduction...)

T.V. Ramachandra
Energy Research Group [Ces]
Centre For Ecological Sciences
Indian Institute Of Science
Bangalore 560012, India.

Address for future Communication & Proofs to be sent to:

T.V. Ramachandra
Energy Research Group [CES]
RNo 215 [ces/tvr/dks/nvj]
Centre for Ecological Sciences
Indian Institute of Science
Bangalore 560012, India.
Telephone: +91-080-3340985 or +91-080-3092506
Fax: +91-080-3341683 or +91 - 080 - 3342085
E-mail: cestvr@ces.iisc.ernet.in
cestvr@hamsadvani.serc.iisc.ernet.in
avn@ces.iisc.ernet.in