植物种群数量研究的Lewis－Leslie区间矩阵模型

利用区间动力系统原理，建立了研究植物种群数量变化趋势的Ｌｅｗｉｓ－Ｌｅｓｌｉｅ区间矩阵模型，并且获得判断种群消长的充分或必要条件．研究新疆莫索湾沙区白梭梭种群的实践标明，该类模型对某些植物种群是有一定应用范围的．特别需要指出，模型的最大特点在于元素的相对不确定性．只要知道其取值范围即可     

模拟微重力效应对辐射致细胞DNA损伤修复效应的影响

在地面模拟微重力的情况下, 应用碱性单细胞凝胶电泳（SCGE）技术对80 MeV/u Ne离子辐射诱发人血淋巴细胞DNA损伤修复效应进行了研究。 在不同时刻对相同剂量辐照后的淋巴细胞经单细胞电泳处理后显示, 在模拟微重力下孵育的彗星尾更长, 彗星头面积更小。 这表明, 相对地面环境而言, 模拟微重力环境对淋巴细胞的DNA损伤修复有一定的抑制作用。 Effect of the modeled microgravity (MMG) on heavy ion induced lymphocytes DNA repair by using single cell gel electrophoresis (SCGE) has been studied. The results showed that residual DNA damage induced by Ne ions irradiation increased more in cultures incubated in MMG than in 1 g, which indicated that MMG incubation after Ne ions irradiation reduce the DNA damage repair capacity.     

甘肃当归新品系DGA2000-02的选育研究

当归新品系DGA2000 02是采用重离子束55 MeV/u 40Ar+15 离子辐照甘肃当归90 01干种子, 按新品种选育程序多年选育而成的。 2005—2007年, 在定西市岷县、 渭源县、 漳县、 陇西县等地当归品系区域试验中, 甘肃当归DGA2000 02平均产鲜当归10 621.5 kg/hm2, 较对照品种（甘肃当归90 01）平均增产鲜当归1 386.0 kg/hm2, 增产率15.0%。 生育期790 d, 茎秆深紫色, 根系黄白色。 测定结果: 总灰分4.2%, 酸不溶性灰分0.4%, 分别优于对照品种16%和33.3%; 浸出物61.4%, 较规定指标提高4.4%; 阿魏酸0.148%, 较规定指标提高2.96倍。 质量显著优于对照品种和2005年版《中国药典》规定指标。 适宜在海拔2 000—2 600 m 、 年降水量500—600 mm的二阴及高寒阴湿生态区栽培。 Angelica sinensis（Oliv）Diels new strain DGA2000 02 was selected successfully by Institute of Modern Physics, Chinese Academy of Sciences, Dryland Farming Research and Extension Center of Dingxi Prefecture, etc. According to the program of new strain selection, this new strain was selected for several years after the dry seeds of Gansu Angelica sinensis（Oliv）Diels 90 01 was irradiated by ions of 55 MeV/u 40Ar+15. During the period of year 2005—2007, region experiments of Angelica sinensis（Oliv）Diels new strain DGA2000 02 were developed in Minxian, Weiyuan, Zhangxian and Longxi etc. Average yield of the fresh DGA2000 02 Angelica was 10 621.5 kg/hm2, and 15.0% production was increased more than control (for 1 386.0 kg/hm2 of 90 01).The growth stage of the DGA2000 02 was 790 d, and it has deep purple stem and yellow white root. The quality analysis results are as follows: total ash content is 4.2% and acid fast ash content is 0.4%, 16% and 33.3% better than control, respectively; the lixivium is 61.4%, i.e., 4.4% more than the standard of Pharmacopoeia of People’s Republic of China (2005 edition); the ferulic acid content is 0.148%, i.e., 2.96 times ligher than the standard. All these results showed that the quality of the DGA2000 02 was better significantly than both control and the standard. It can be grown appropriately at the high, cold and dankness regions at the altitude of 2 000—2 600 m and with a annual precipitation of 500—600 mm.     

中国科学院近代物理研究所重离子辐照生物研究平台

介绍了中国科学院近代物理研究所和兰州重离子加速器国家实验室的重离子加速器辐照生物研究平台、 重离子辐照生物研究发展规划及在现代农业和生物产业方面取得的一些最新进展。 Heavy-ion accelerator facilities for the researches on biological effects induced by heavy ion at Institute of Modern Physics（IMP）, Chinese Academy of Sciences and National Laboratory of Heavy ion Accelerator in Lanzhou（HLHIAL） are introduced. New progresses in modern agriculture and biological industry are presented.     

中能重离子剂量深度曲线计算

重离子束应用在治疗肿瘤上具有优越的深度剂量分布特点.发展精确计算剂量的物理模型理论成为其应用的关键,为此,首先从生物细胞的化学组成成分、放射生物学的特点和物理剂量计算的要求对理论计算的介质进行了选择.利用现有计算核反应部分截面和修正的总截面经验公式,同时考虑了不同影响理论计算的因素,提出了中能重离子理论计算深度剂量分布的方法,其计算结果与实验数据符合很好,可应用在重离子治癌和生物学效应研究中.     

四阶和五阶微分方程的不稳定性定理

本文建立了某些非线性四阶和五阶微分方程的不稳定性的充分条件.     

重离子束定点诱变育种初探

介绍了在兰州重离子加速器上采用 75 Me V/u16O8+离子进行了贯穿与定点注入的实验 ,以及不同注入部位的种子在实验室萌发的根尖细胞染色体的微核率和畸变率与大田培育结果随剂量的变化情况 .经过 3年 5代 (南繁加代 )的系统选育 ,筛选出增产、矮杆、抗 (锈 )病、抗干热风和早熟等 9个稳定突变系.Penetration and site chosen implantation of spring wheat seeds at HIRFL with 75 MeV/u 16 O 8+ ions were caried out. The seeds, of which the different sites ware implanted by the ions were germinated in room. The frequency of micronuclei and chromosome aberration in their root tip cells was observed. The results of their cultivation in the field were different. Through selection of three year five generations (adding a generation in southern China each year), nine stable...     

碳离子束辐照对油葵当代结实特性的影响

利用兰州重离子研究装置(HIRFL)的碳离子束辐照油葵干种子,统计出苗率、存活率、花粉活力、柱头可授性和不同授粉条件下的结实率,研究碳离子束辐照对油葵当代结实特性的影响。结果表明,出苗率、存活率、花粉活力、结实率随着辐照剂量增加而降低;与对照相比,80 Gy辐照后出苗率下降55.68%、存活率下降64.66%;20～160 Gy辐照显著降低了自交结实率,40～160 Gy辐照显著降低了混交结实率;花粉活力由对照组的92.01%降低为160 Gy的47.59%;随着辐照剂量的增加,具有较强可授性柱头的百分比逐渐降低,具有较弱可授性柱头和不具可授性柱头的百分比逐渐增加。研究表明,碳离子束辐照对油葵当代的损伤作用,影响了花器官的育性,降低了结实率;根据存活率的半致死剂量,结合混交结实率的半不育剂量,确定油葵适宜辐照剂量范围55～153 Gy,为碳离子束辐照油葵育种选择适宜辐照剂量提供了参考。     

TILLING技术的最新进展及其在辐射诱变育种中的应用前景

定向诱导基因组局部突变技术(Targeting Induced Local Lesions IN Genomes, 简称TILLINC)是一种全新的、高通量和低成本反向遗传学研究方法。近年来, 随着突变筛选技术的革新, TILLING技术平台日趋多元化, 使得TILLING技术的操作更为简单﹑快速, 并广泛应用于作物育种研究领域。简要介绍了TILLING技术平台的最新发展动态, 并初步探讨了将辐射诱变处理与TILLING高通量筛选相结合在诱变育种中的应用前景。To investigate the M1 biological effects of heavy ions irradiation on Lycopersicon esculentum Mill., its seeds were irradiated by 12C6+heavy ions (80 MeV/u) with the dosages of 30, 60, 90, 120 and 160 Gy respectively . The results showed that with doses increased gradually, germination rate and seedling rate of Lycopersicon esculentum Mill. were decreased, and the latter was lower than the former, mainly due to the inhibition of root growth. The irradiation increased the content of MDA and proline evidently, showing irradiation could damage biomembrane, and also decreased the activities of POD and SOD with distinct inhibition pattern. However, the low dose and high dose irradiation promoted APX activity, illustrating APX was induced to protect irradiation injury. In brief, exposure to 12C6+ heavy ions had obvious injury effects on the seeds of Lycopersicon esculentum Mill.. Heavy ions irradiation damaged biomembrane, inhibited activities of enzymes, and finally inhibited the growth of the first generation of these seeds.