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| 1 | 濒危物种Helianthemum ordosicum的群落学、生态和繁殖特征显示文摘Helianthemum ordosicum,Y.Z.Zhao,Z.Y.Zhu etR.Cao是发现于蒙古高原东阿拉善和西鄂尔多斯沙漠的第三纪残遗特有植物。我们对H.ordosicum的群落、生态和繁殖特征进行了5年的研究,涉及其生境、环境适应、与其它植物群落的关系、传粉、种子形成及萌发等,本研究基于野外观察、取样和实验室分析。结果表明,H.ordosicum的分布范围在缩小,其植物群落已逐渐适应干旱的气候条件,年龄结构偏高,这指示着与人类活动有关的环境变化和干扰。有性繁殖少能成功,传粉效率低,胚胎很少能够成熟;无性繁殖靠茎切断完成。然而,H. | Cao Rui Ma Hong Wang Ying-chun Morigen Tian Yuan Duan Fei-zhou 但万春 | 2002 | AMBIO-人类环境杂志2002，31，3： | 2 |
| 2 | Regulation of chromosomal replication by DnaA protein availability in Escherichia coli: effects of the data region 显示文摘 | MORIGEN BOYE E SKARSTAD K | 2001 | Biochim Biophys Acta2001，1521，13： | 1 |
| 3 | Titration of the Escherichia coli DnaA protein to excess datA sites causes destabilization of replication forks,delayed replication initiation and delayed cell division显示文摘 | Morigen L(o)bner-Olesen A Skarstad K | | 0，，： | 1 |
| 4 | A DnaA-dependent riboswitch for transcription attenuation of the his operon显示文摘Transcription attenuation in response to the availability of a specific amino acid is believed to be controlled by alternative configurations of RNA secondary structures that lead to the arrest of translation or the release of the arrested ribosome from the leader mRNA molecule.In this study,we first report a possible example of the DnaA‐dependent riboswitch for transcription attenuation in Escherichia coli.We show that(i)DnaA regulates the transcription of the structural genes but not that of the leader hisL gene;(ii)DnaA might bind to rDnaA boxes present in the HisL‐SL RNA,and subsequently attenuate the transcription of the operon;(iii)the HisL‐SL RNA and rDnaA boxes are phylogenetically conserved and evolutionarily important;and(iv)the translating ribosome is required for deattenuation of the his operon,whereas tRNA^(His) strengthens attenuation.This mechanism seems to be phylogenetically conserved in Gram‐negative bacteria and evolutionarily important. | Yuan Yao Hongwei Sun Wurihan Gegeheng Gezi Kirsten Skarstad Lifei Fan Morigen | 2023 | mLife2023，2，2： | 0 |
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