New Delhi, Dec 1 (IANS) Prime Minister Manmohan Singh Monday formally took charge of the finance portfolio by chairing a meeting with all the secretaries of the ministry, asking them to ensure that every possible measure is taken to ensure that India’s growth momentum at a time of global financial crisis is maintained.In the reshuffle in the cabinet Sunday, in the wake of the Mumbai terror attacks, Finance Minister P. Chidambaram was shifted to the home ministry, even as even as the prime minister decided to keep with himself the finance portfolio, a territory he was familiar, with having headed it from 1991 to 1996.