Genetic diversity in the male-specific <Emphasis Type="Italic">SRY</Emphasis> gene of <Emphasis Type="Italic">Lepus yarkandensis</Emphasis>

Lepus yarkandensis, an endemic hare species in the Tarim Basin of China, has been suffering from habitat fragmentation due to desert expansion. To evaluate the effect of habitat fragmentation on its genetic diversity, the genetic diversity based on male-specific SRY gene marker is examined. A relatively low level of SRY genetic diversity is found compared to previous studies with mtDNA data, possibly due to the low SRY mutation rate and positive selection. Furthermore, one haplotype exists in eight populations along the Tarim River but not in many other relatively isolated populations, suggesting that habitat fragmentation may affect population divergence. Despite this, our pairwise Fst analysis shows no significant differentiation among populations, and this may be mainly caused by positive selection on the SRY gene in that 88 percent of individuals share the same haplotype. Finally, the phylogenetic analysis shows deep differentiation between L. yarkandensis and other two hare species (L. capensis and L. europaeus).     

Characteristics of the short rachillae of rice from archaeological sites dating to 7000 years ago

The abscission layer formed on a pedicel situated at the basal part of a short rachilla is an important characteristic for discriminating between wild, japonica, and indica rice. The short rachillae of paddy rice grains excavated from the Kuahuqiao, Luojiajiao, and Tianluoshan sites, located in the lower reaches of the Yangtze River and dating to 7000 years old, were observed. The results showed that the short rachillae could be divided into two types: a wild type and japonica type. These results indicated that the rice had been domesticated, but was a primitive cultivated rice that retained some of the characteristics of wild rice. The results also suggested that the rice was changing to resemble japonica type rice. Based on the ratios of wild and japonica types, it was inferred that rice domestication began 10000 years ago.     

腐殖酸与稀土元素的结合点位及其表征研究

采用红外光谱(FTIR)与核磁共振波谱(1H NMR和13C NMR)技术,对来自森林土壤和湖泊沉积物的两种腐殖酸及其与三价稀土离子(RE3 )沉淀反应的产物进行对比研究.结果表明,腐殖酸结构中活性官能团特征以及它的拥有量因腐殖化程度不同而存在较大差异.腐殖酸与RE3 沉淀反应产物在性质上属于一种有机弱酸盐,羧基-COOH和酚羟基-OH为主要结合点位,结合反应过程中它们的质子被RE3 交换出来.     

达州红色遗址遗迹的价值评估

达州红色遗址遗迹的历史基础主要有三个方面的来源:中共达州地方党组织的早期革命活动;川陕革命根据地时期的历史遗存;杰出历史人物的红色活动印迹。在这些历史基础上构成了达州现在红色遗址遗迹类别、层次多样化的格局,并在全国、全省和川东北地区占有独特的比较优势。红色遗址遗迹对达州红色文化和经济社会发展有着不可替代的重要价值:一是收藏革命文物,研究革命历史,为达州红色文化发展奠定基础;二是宣传革命文化,发扬红军精神,为达州红色文化发展增添动力;三是大量红色遗址遗迹成为达州红色旅游的重要景点,助力地方经济社会发展。     

Relationship between the temporal-spatial distribution of archaeological sites and natural environment from the Paleolithic Age to the Tang and Song Dynasties in the Three Gorges Reservoir of Chongqing area

The temporal-spatial distribution features including time distribution,horizontal and vertical spatial distribution of archaeological sites from the Paleolithic Age to the Tang and Song Dynasties in the Three Gorges Reservoir of Chongqing area are analyzed based on GIS spatial analysis.The successive pollen record of deposited peat stratum since the Paleolithic Age in the Dajiuhu Basin of Shennongjia is used in combination with the research of the historical environmental evolution to reconstruct the Paleoenvironment in the Three Gorges Reservoir of Chongqing area.Through the comparison of the temporal-spatial distribution of the archaeological sites and the natural environment,the relation between the distribution of the archaeological sites and the natural environment evolution and disaster changes from the Neolithic Age to the Tang and Song Dynasties has been discussed.Study shows that 677 archaeological sites from the Paleolithic Age to the Tang and Song Dynasties in the Three Gorges Reservoir of Chongqing area increase gradually from west to east and from high land to low land.Most of the sites are distributed along the river and aggregated at the confluence.Obviously,the altitudes of archaeological sites in the Paleolithic Age and the Neolithic Age are much higher than those of historical sites.The analysis suggests:(1)the human beings of every times would like to choose the first or the second river terrace as living sites which are nearer to the water source and are easier to with- stand flood.The pre-historical sites of earlier ages are often located at the higher altitude place because of the tectonic uplift and downcutting of rivers since Holocene.(2)Due to the rugged terrain in Chongqing area,most of the sites are located along the river sides,for example,the wide river valley and terrace,which could provide wider living space caused by the lateral erosion and deposition of the river course.(3)The early residents mainly relied on fishing,hunting and agriculture,and the rugged terrain of the mountaino     

物元分析法在郑州市大气监测优化布点中的应用

利用物元分析法,在大气污染普查基础上,以郑州市污染最严重的季节（冬季）的数据为准,构造大气环境监测的标准物元矩阵,求出关联函数值,进行了大气监测点的优选,并与用模糊聚类选出的点位相比较,来验证郑州市目前已有监测子站建立的合理性,能代表郑州市整个区域,并以此证明物元分析法是环境监测优化布点的一种可靠的方法。     

NAP1基因和ARHP基因启动子区的生物信息学分析

采用进化足迹法,利用生物信息学在线软件,分析了鼻咽癌相关肽基因NAP1和成人视网膜假定蛋白基因ARHP的启动子结构,在人和小鼠NAP1基因的启动子保守区内预测出38个共同的转录因子结合部位,在人和小鼠ARHP基因的启动子保守区内预测出44个共同的转录因子结合部位,分析结果为NAP1基因和ARHP基因调控区的分析与鉴定,基因表达调控机制的研究提供了重要的参考.     

作业风险分析法在文物保护单位旅游开放风险分析中的应用

旅游开放是弘扬传统文化的有力手段，但在旅游开放过程中也会带来一定的安全风险。作业风险分析法（TRA）是一种较为系统、全面的风险分析方法。本研究根据文物保护单位旅游服务内容，利用TRA法辨识了文物保护单位旅游开放服务过程中的潜在风险，分析了风险产生的原因及后果，提出了改进和控制风险的措施。结合文物保护单位风险管理项目案例，介绍了风险分析在建立风险管理模式、确定重点管控环节、制定岗位风险告知卡、完善安全制度及规程方面的应用。     

慢性肾炎尿毒症患者染色体脆性位点的初步研究

作者采用低小牛血清，低叶酸的TC199培养基及高pH值的培养方法，对16例住院慢性肾炎尿毒症患者，24例正常年轻人外周血淋巴细胞染色体脆性部位及染色体畸变进行了研究，结果表明，慢性肾炎尿毒症患者的染色体畸变及脆性部位表达均较对照组高（P＜0．01），其中3p^14表达最高。