Major Test Completed on LM-9 Heavy Launch Vehicle Engine

A compatibility test on the turbopump and gas generator of 500-ton liquid oxygen kerosene engine developed by the Academy of Aerospace Liquid Propulsion Technology was successful on March 24,2019,marking China’s realization of key technologies and the in-depth demonstration of the 500-ton heavy launch vehicle,and laying a solid foundation for the subsequent development of heavy launch vehicle engine.

LM-2C Used in SJ-9A/B Mission

At 11:25 a.m. on October 14, China successfully sent the SJ-9A/B satellites into their preset transfer orbits with one LM-2C launch vehicle from the Taiyuan Satellite Launch Center. The LM-2C launch vehicle used for the mission was manufactured by China Academy of Launch Vehicle Technology (CALT) of China Aerospace Science and Technology Corporation (CASC). The launch marked the 169th launch of the Long March series launch vehicle. The launch vehicle used for the mission differs not much

胃癌常见中医证型与CDX2、LN-R和MMP-9阳性表达的相关性研究

目的通过研究不同证型胃癌组织中CDX2、MMP-9和LM-R的表达差异,探索不同证型胃癌中CDX2、MMP-9和LM-R的表达规律。方法收集2002年～2003年经我院手术治疗的53例胃癌患者组织蜡块。采用免疫组织化学技术(EnVision法)检测癌组织及癌旁正常黏膜中CDX2、MMP-9和LM-R蛋白的表达情况。结果CDX2在三种不同的中医证型中的表达无明显差异性(P>0.05);MMP-9和LM-R的表达情况有显著统计学差异。结论不同证型胃癌中CDX2、MMP-9和LM-R蛋白表达的差异说明它们可能作为胃癌证型客观化指标之一。

骨肉瘤与活化B淋巴细胞融合株的建立及其体内外生物学特性

目的 :建立骨肉瘤与活化B淋巴细胞融合的肿瘤疫苗 ,探讨其方法及其生物学特性。方法 :以 5 0 %PEG为融合剂 ,将C3h小鼠来源的HGRPT基因缺陷型LM9骨肉瘤细胞与LPS活化的C3h小鼠B淋巴细胞进行融合。经HAT选择性培养基筛选后 ,再观察该融合瘤株的体内外生长特性及对C3h小鼠的致瘤性。结果 :该融合瘤株体外生长缓慢 ,对C3h小鼠无致瘤性 ,与LM9细胞有较大差别。结论 :与活化B淋巴细胞融合 ,骨肉瘤细胞可能改变其生物学特性 。