分子在高振动能态上的异常行为

分子光谱是分子向人类展示其内部的结构和运动状态的窗口.最近十多年来,我们一直在通过这个窗口研究多原子分子在高激发态上的行为.     

环戊酮离子第五激发态振动模式的研究

我们注意到CIS方法计算分子激发态垂直激发能、几何构形和振动频率的效率是较高的,所得到的结果能够为我们进一步采用较为复杂的方法研究分子激发态提供很好的借鉴和研究基础,并且这种方法的简单易用使得它能够应用在较大分子激发态的研究上。     

“科学与中国”院士专家巡讲团活动开始启动

中国科学院、中共中央宣传部、教育部、科学技术部、中国工程院、中国科学技术协会联合主办的“科学与中国”院士专家巡讲团活动于１２月９日在北京大学举行了开幕式暨首场报告会。这是科技界积极推进“科教兴国”和可持续发展战略的实施,以实际行动贯彻落实“十六大”精神和“三个代表”重要思想的重大举措。这项活动旨在通过对科学技术发展历程的回顾和未来科学技术发展前景的展望,通过对科学研究经历的感悟和凝练,普及科学知识、倡导科学方法、传播科学思想、弘扬科学精神;深入理解科学技术作为第一生产力对推动先进生产力的发展以及…     

The molecular diversity analysis of Auricularia auricula-judae in China by nuclear ribosomal DNA intergenic spacer

BackgroundFor the crossbreeding of Auricularia auricula-judae, selecting the appropriated parents in hybridization is very important. However, the classification and diversity analysis of A. auricula-judae has been equivocal, due to the similarity of the fruiting body morphology and its susceptibility to environmental influences. For this purpose, the molecular diversity of 32 A. auricula-judae commercial cultivars in China was analyzed by using the nuclear ribosomal DNA intergenic spacer.ResultsThe complete nuclear rDNA gene complex of A. auricula-judae isolate is 11,210 bp long, and contains the 18S, 5.8S, and 28S rRNA gene as well as the ITS and IGS regions. Based on the sequence data, four more effective primer combinations for the IGS region of A. auricula-judae were designed. Nucleotide sequence variation in the IGS among 32 A. auricula-judae commercial cultivars in China sorted into three strongly supported clades, which is correlated with geographical regions. Most strains originated from the same area were with a narrow genetic basis and could possibly be domesticated from the local wild-type strains.ConclusionThe grouping information obtained in the present work provides significant information for further genetic improvement in A. auricula-judae, and suggested that the IGS region can be used as an excellent tool for identification of genetic variation.