模拟移动床色谱分离玉米须粗提物

在无标样的情况下,应用模拟移动床色谱分离玉米须粗提物,并得到含量为92%的产品。经液质、红外、紫外鉴定为黄酮类。     

拨板机构的设计与试验

针对现有远红外蔬菜脱水机存在的输送链板不能按时翻转落料甚至脱落等问题,对其拨板机构进行了改进.试验证明,改进后的拨板机构能够保证设备顺利地实施前后链板的左右交替换位,其换位率达99.47%,因拨板机构卡住而导致双面输送链板脱落的可能性降为0,从而使翻转落料得以顺利实施;采用可调活板结构调节轴承外圆至链轮节圆之间的距离,保证了拨板机构的位置精度.采用该拨板机构时,其支座角度以135.左右为宜,轴承外圆至链轮节圆之间的距离最好为0或略小于0.     

Comparison of lattice designs,check plots,and moving means in wheat breeding trials

Summary Efficiencies of lattice designs, check plot designs, and moving means were compared in seven environments for control of error in wheat breeding trials. Lattice analyses of lattice designs and check plot covariance analyses of check plot designs gave similar CV's and intra-site heritabilities and were superior to direct RCBD analyses of these designs. Moving mean covariance analyses were generally only slightly less efficient than lattice analyses or check plot covariance analyses. Differences between designs and methods of analysis, which were evident on an intra-site basis, were not evident from combined analyses indicating that genotype x environment interaction is much more important than intra-site error in limiting progress from selection. Moving mean covariance analyses with 2 replicates per location and as many locations as feasible is suggested as a useful strategy for early generation wheat breeding trials.     

Effect of moving mean covariance adjustments on error and genetic variance estimates and selection of superior lines in peanuts (Arachis hypogaeal L.)

Summary Effects of moving mean covariance adjustments on error control, genetic variance component estimates and selection were examined in nine trails in peanut breeding nurseries. Neighbourhood sizes of two to fourteen adjacent plots were used in two types of moving mean covariates: one based on adjacent plot yields and a second based on adjacent plot residuals after removal of replicate and treatment effects. Both covariate types reduced error variance, in one trial by up to 57%, although the covariate type giving the most error reduction varied among trials. Generally most error variance reduction occurred when six to eight adjacent plots were used.In some trials genetic variance component estimates following covariance adjustment were higher than those from unadjusted analyses and in other trials they were lower. As the neighbourhood size included in the moving mean increased from two to fourteen plots the genetic variance component estimate changed considerably in some trials. However, large rank changes did not appear to be associated with these genetic variance component changes as neighbourhood size had little influence on the selection of progenies. Also, genetic effects included in the yield covariate had little influence on selection of elite lines as essentially the same lines were chosen or rejected when residual covariates lacking these genetic effects wre used.     

Local adjustment method for field experiments. 1. The method and its examination by computer simulation

Summary The modification of the nearest neighbour method for using various size plots in field trials has been developed and the results of testing its validity by computer simulation are presented. It was found that the Field-S variant of this method using a square pilot area is the best for fields with a low and medium spatial heterogeneity. The Field-L variant using the least quantity of neighbours, offers advantages for fields with a medium and high spatial effect. The optimal values of the controlling coefficients of these variants were computed to allow for the calculation of the environmental indices over a wide interval of spatial heterogeneity with sufficient accuracy. For this reason, this local adjustment method is recommended as an obligatory statistical procedure for a prior data analysis of any field experiments that have fulfilled the necessary requirements. The original Field and CRBSD programs using the local adjustment method developed have been created for IBM-compatible personal computers.     

生物活菌素应用于褶皱臂尾轮虫规模化培养的初探

用不同盐度的池水 ,添加以芽胞杆菌为主体的生物活菌素 ,进行褶皱臂尾轮虫 (Brachionusplictilis )培养试验 ,试验结果表明 :投放活菌素的各试验组均能有效降低氨氮浓度 ,维持良好的水质环境 ,此种有效维持时间大约为 7d ,7d后需重新投入生物活菌素 ;生物活菌素对 pH值的影响不显著。运用Logistic方程分析 ,生物活菌素能提高种群环境容纳量 (种群增长最大值 ,即K值 ) ,并可预测最佳倒池时机 ,即达到K/ 2的时间     

模拟移动床分离纯化纳豆激酶的研究

利用模拟移动床从纳豆激酶发酵液中分离纯化纳豆激酶,通过单柱试验计算出模拟移动床的分区方式及初始参数,利用正交试验方法优化参数,最终所得纳豆激酶的纯度为90%,收率为85%,活性为(8 000±50)IU/mg。     

流动沙丘沙柳分区造林技术研究

根据沙丘风沙流运移规律,控制流动沙丘的风蚀、促进沙埋是提高流动沙地沙柳固沙林的关键.为此,按照沙丘高度和坡度的差异,并采取分区造林模式,适度恢复沙地植被.并结合生产实际,研究了库布齐沙漠立地类型与沙柳造林效果的关系,探讨了流动沙丘部位、插条长度对沙柳造林的影响.     

感受全国荷展 感动魅力传承

全国荷花展览自1987年以来,已经举办了19届,在此二十年大庆之际,我们在感受、感动中,深深体会到全国荷花展览就是荷花分会的务实圆心软件,是在大家的关爱、激情中走过来的,是荷花分会传统的“创意”品牌。她经历了三个大转折,三次大跨越;呈现了一个新的文化符号;引邻了荷花学科的前沿发展;提供了行业振兴的宽阔平台;推动了荷花文化的扩张雄心;蕴藏了水生植物整体发展的时代内涵。     

宁夏盐池县四儿滩湿地交错带判定及变化分析

根据生态交错带变化对周围环境变化具有一定指示作用的原理,利用游动分割窗技术对宁夏盐池四儿滩湿地交错带进行判定,并结合样方植被调查、生物多样性指数、降雨量等因素分析了交错带变化情况。结果表明,游动分割窗技术适用于四儿滩湿地交错带判定,适宜窗口宽度为8个样方;2006—2013年的交错带判定结果发现,2007年湿地宽度最大,距湿地中心距离最远,健康状况最好。之后几年各项指数呈逐年下降趋势,湿地健康状况逐年变差,其变差的原因是2008年高铁建设截断了湿地上游水源补给。因此,在注重经济发展的同时,要尽量少破坏地表径流系统,以利于湿地长远发展。研究表明,在西北半干旱区湿地健康评价和退化研究中,通过交错带的变化来反映整个湿地生态系统健康状况是一种可行的思路和方法。