WALTHAM, Mass.--(BUSINESS WIRE)--Thermo Fisher Scientific Inc. (NYSE:TMO), the world leader in serving science, today announced that it has provided notice to holders of its 3.25 percent convertible senior subordinated notes due March 1, 2024, as required by the indenture governing the notes, that the holders have the option to require the company to purchase the notes on March 1, 2011. The purchase of the notes would be at par, together with accrued and unpaid interest from September 1, 2010. The notice is also available on the company’s Website, www.thermofisher.com.