The Lockheed Martin X-33 was a proposed uncrewed, sub-scale technology demonstrator suborbital spaceplane that was developed for a period in the 1990s. The X-33 was a technology demonstrator for the VentureStar orbital spaceplane, which was planned to be a next-generation, commercially operated reusable launch vehicle .

2016年2月17日 · The X-33, a half-scale vehicle, was expected to feature a lifting-body shape, a new "aerospike" rocket engine, and a rugged metallic thermal protection system. NASA selected Lockheed Martin to design, build, and fly the X-33 Advanced Technology Demonstrator test vehicle between March and December 1999.

2014年2月28日 · The X-33 program began in 1994 as part of NASA’s Reusable Launch Vehicle (RLV) program. It awarded a contract to Lockheed Martin to build and fly an uncrewed technology demonstrator. Much of the vehicle was entirely new, including the linear aerospace rocket motor and the composite cryogenic propellant tanks.

毕赤酵母宿主菌常用的菌株类型有四种（如表 1 ），分别是x33、 gs115 、 km71h 、 smd116 [3] 。其中 x33 是野生型菌株，而 gs115 和 km71h 两种，都具有 his4 营养缺陷标记。

2021年7月8日 · X-33 was the sub-scale prototype version of the Single Stage to Orbit Venture Star. It was wedge shaped X-33. It was developed jointly between NASA and Lockheed Martin Skunk Works of Palmdale, California. X-33 was cancelled in 2001.

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2009年9月26日 · The most significant project under the umbrella of the Space Launch Initiative (SLI) was the Lockheed Martin X-33 announced in 1996. The ultimate goal of the X-33 was to develop a completely reusable single-stage-to-orbit (SSTO) launch vehicle to replace the aging Space Shuttle by about 2010.

X-33毕赤酵母被推荐用来表达含有Zeocin抗性的载体载体重组质粒，例如pPICZA,B,C系列的载体。 在筛选X-33重组转化菌株时，Zeocin抗生素的工作浓度是100ug/ml。

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