Hi to all, We have encountered a problem with the Liquid Nitrogen system at BNC, this effects liquid only . This means there is no LN2 available for filling of dewars or any equipment that requires LN2. However you can place an order to a vendor or contact me at 6-1174 and I can order them for you. We do not know at this time how long the system will be inoperable. Kenny Schwartz Birck Nanotechnology Center Purdue University PH 765-496-1174