Localization Band Angle Prediction With Three invariant Model

The prediction with RR’s two invariant Model are smaller than the data, while it can catch the trend of linear increase in band angle with increasing mean stress for fixed values of the least compressive stress and a decrease with increasing values of the least compressive stress.Based on the RR’s two invariant Model, with a Lode angle as the third invariant and the more complicated yield condition, true trixial compression test was carried out.And three invariant model was proposed in good agreement between real data and predictions.     

新麦草(Psathyrostachys juncea)两个高分子量谷蛋白亚基基因上游序列的克隆与分析

应用PCR技术对新麦草PI429801和PI406469的高分子量谷蛋白基因上游序列进行了克隆,得到长度分别为998和1000 bp的HMW-N1和HMW-N2序列。比较发现,HMW-N1与麦类HMW-GS基因上游序列一致性在85%以上,与滨麦(Leymus mollis)序列DQ073542一致性最高,达98%;HMW-N2与麦类HMW-GS基因上游序列一致性在81%以上,与二角山羊草(Aegilops bicornis)序列AY611726一致性最高,达98%。系统进化分析表明,HMW-N1与含Ns染色体组的赖草属物种的同源基因序列DQ073551、FJ600498和DQ073546亲缘关系最近,HMW-N2却与含D染色体组节节麦和普通小麦的同源基因序列FJ008134、AY248704和DQ537337以及含S染色体组的山羊草物种的同源基因序列AY611726、AY611721和AY611724的亲缘关系较近。同时,HMW-N1和HMW-N2也具有E-box、N-box、partial Enhancer、complete Enhancer、TATA-box和Start等高分子量谷蛋白基因启动子区域的典型特征。本研究结果可为新麦草高分子量谷蛋白基因的克隆提供帮助,对从新麦草属以及其他小麦近缘属物种中分离未知高分子量谷蛋白基因有参考价值和借鉴意义。     

图书馆建筑室内外环境营造的几点思考——以孝感学院图书馆为例

主要结合孝感学院新图书馆室内外环境建设取得的成功经验和存在的不足,提出图书馆环境建设应重点营造的几个环节,如场地设计、门厅设计、休息厅设计、阅览厅设计等,使图书馆真正成为读者的＂第二起居室＂。     

诗情画意情景交融——品“拙政园”的艺术特征

中国古典园林是一门综合艺术,各学科相互影响、相互渗透,为人们创造了一个充盈着精神内容和物质享受的生活境域。拙政园的艺术特征就在于由诗入园与人景合一、由画入景与物我圆融、由情入境与情景交融。     

白令海陆坡头足类群落结构及其与环境因子的关系分析

根据2002、2004、2008、2010、2012和2016年白令海陆坡海域底层拖网的资源调查数据,分析了白令海陆坡头足类的群落组成,量化了其资源丰度（以CPUE表征,Catch per unit effort）在经纬度上的分布情况,确定了白令海大陆坡头足类优势种和优势种的空间分布及与环境因子的关系,并通过生态学方法对头足类群落多样性进行了研究。结果显示,调查共鉴定头足类20种,分别隶属于3目9 科15属。在纬度上, CPUE最高值（0.78 kg/km2）出现在55oN;经度上除了在166.5oW、171.5oW和177.5oW附近CPUE值超过1.0 kg/km2外,其余经度均稳定在0.3～0.7 kg/km2之间。优势种为贝乌贼、水蛸、加利福尼亚面蛸、光滑深海蛸和太平洋僧头乌贼,并且优势种的分布在空间上存在一定的差异,172oW以东的站点头足类以优势种为主,优势种以外的其他种类分布较少,而在172oW以西的站点发现的头足类中,除了贝乌贼和水蛸资源丰度占比较高外,非优势种的其他头足类占比也较高。GAM分析表明经度、纬度、深度、底层水温和表层水温是影响大多优势种资源丰度的重要因子,聚类分析结果显示不同地区站点主要为两大集群,不同集群之间群落多样性指数存在较大的差异。     

东海毛颚类种类组成和多样性

根据1997～2000年东海23°30′～33°N、118°30′～128°E海域4个季节海洋调查资料,对东海毛颚类种类组成、多样性分布特征及与环境关系进行分析。结果表明:春、夏季毛颚类种类最丰富(25种),冬季次之(23种),秋季种数最低(21种);冬、春季毛颚类种数仅与表层温度相关,夏季与表层温度、表层盐度二元线性相关,秋季与表层盐度相关;冬、春季毛颚类多样性和丰富度指数值由北向南,由近海向外海逐渐增高,夏季近海和外海差异缩小,秋季多样性指数值为4季最低。     

干燥和重新湿润过程引起土壤CO_2激发释放的模拟研究

应用短期培养实验研究了干燥和重新湿润引起的土壤CO2激发释放及其动力学过程.结果表明,不经干燥和重新湿润处理土壤CO2释放速率基本不随时间变化,其CO2释放过程可以用零级反应动力学方程(y=k0t)描述;干燥和重新湿润处理过程能够引起明显的土壤CO2激发释放,这是干燥和重新湿润引起的土壤呼吸激发效应(一级反应)和土壤基本呼吸(零级反应)相互叠加的结果,可以用两库叠加模型y=at+Ao(1-e-kt)很好描述.本实验条件下扰动、干燥和重新湿润引起的(蝼)土CO2净激发释放量为23.05～59.90 mg CO2-C·kg-1,主要与不同培肥措施长期实施造成的土壤性质和肥力差异,特别是有机质数量和质量的差异有密切关系.     

ISSR Analysis on Genetic Diversity of the 34 Populations of Oryza meyeriana Distributing in Yunnan Province,China

The genetic diversity of the 34 populations of wild rice Oryza meyeriana Baill.distributed in Yunnan Province,China was analyzed using 13 inter-simple sequence repeat(ISSR)markers.A total of 168 bands were amplified,of which 135 polymorphic bands were discovered and the percentage of polymorphic bands(PPB)was 80.36%.A genetic diversity was revealed as Nei's gene diversity(H)=0.2666 and Shannon information index(η)=0.4028 at population level.The 34 populations were divided into different groups based on administrative regions,latitude and longitudes,river areas,altitudes of their origins,and their indexes such as Na(number of alleles),Ne(effective number of alleles),H,I and PPB were calculated.Richer genetic diversity was found in the wild rice populations distributed in Simao Prefecture than that in Lingcang Prefecture or Xishuangbanna Prefecture whereas the least genetic diversity was in Baoshan Prefecture or Dehong Prefecture.Rich genetic diversity was also discovered in the wild rice populations originated from higher than 710 m altitude around the middle and lower reaches of the Lancang River belonging to the Pacific Ocean drainage system.The 34 populations could be classified into two groups,one group covered the wild rice distributing in Simao Prefecture only while the other group covered ones in Lingcang,Xishuangbanna and Oehong Prefectures.The issue on how to effectively conserve the wild rice germplasm was discussed.     

InDel and SNP Markers and Their Applications in Map-based Cloning of Rice Genes

High-density markers are necessary for map-based cloning of dca genes, but the currently available markers are not satisfactory enough. InDel (insertion-deletion length polymorphism) and SNP (single nucleotide polymorphism) are the new generation of molecular markers and can basically meet the need of fine mapping. InDel and SNP markers can be developed through bioinformatics. These markers are valuable markers with the characters of low cost, high specificity and stability. This article introduced the methods for designing InDel and SNP markers, taking the mapping of a dce rolled leaf gene as an example. In addition, some key factors in improving the design efficiency were also discussed.     

2022年河南省小麦茎基腐病和赤霉病病原种群分离鉴定

近年来,茎基腐病和赤霉病在中国黄淮麦区发生严重,对小麦产量及品质造成较大影响。各地报道小麦茎基腐病和赤霉病病原菌种类有所差异。为明确当前中国小麦主产区河南小麦茎基腐病和赤霉病病原菌种类变化情况,本研究对2022年采自河南省安阳、漯河、周口、南阳等8个不同生态区的小麦茎基腐病病株和赤霉病病穗进行了分离纯化,分别得到257和88株分离物。形态学及分子生物学鉴定结果表明,小麦茎基腐病样品分离物中,假禾谷镰孢菌(Fusarium pseudograminearum)231株,占比89.88%;禾谷镰孢菌(F.graminearum)23株,占比8.95%。赤霉病样品的分离物中,禾谷镰孢菌76株,占比86.36%;假禾谷镰孢菌10株,占比11.36%。2022年河南省所有采样地区的茎基腐病的优势病原菌均为假禾谷镰孢菌,赤霉病的优势病原菌仍为禾谷镰孢菌,但赤霉病样品分离物中假禾谷镰孢菌的占比有所增长,特别是在安阳、平顶山和漯河市的赤霉病样品中假禾谷镰孢菌的分离频率达到了10%以上。