Roundup: A123 files for IPO, Nokia opens in Africa, Calera comes out, and more

A123 Systems files proposal for IPO — Lithium-ion battery maker A123 Systems , which aims to sell into the electric vehicle market, has filed the initial registration statement required for an initial public offering. The number of shares to be sold or price has not yet been determined. Nokia opens research unit in Africa — Aiming to keep ahead in Africa’s growing telecommunications market, handset maker Nokia has opened a unit to study which services will work best on the continent. Calera succeeds in binding CO2 into cement — An initial pilot project by stealth-mode cement maker Calera , which was funded last year by Khosla Ventures , has successfully run a pilot in which it bound about half a ton of CO2 for every ton of cement it made. Usually, cement manufacturing is a huge emitter of CO2. The Scientific American has a profile, with more details. However, the biggest question — whether Calera can make cement cost-effectively R...