Kernel size and weight affected by three plant bioregulators applied at bloom to Non Pareil and Carmel almond cultivars

BackgroundThe yield of almonds [Prunus dulcis (Mill.) D.A. Webb] could be low due to climatic problems and any factor improving kernel size and weight, such as the use of plant bioregulators (PBRs), should be beneficial.ResultsThree plant bioregulators: 24-epibrassinolide (BL), gibberellic acid (GA₃) and kinetin (KN) were applied at three spray concentrations to Non Pareil and Carmel cultivars, at two phenological stages during bloom, in the 2014 and 2015 seasons. The results showed significant differences (P < 0.0001). For total dry weight of Non Pareil, the best treatment was BL (30 mg·L^-1), with an average of 1.45 g, while the control was 1.30 g, at pink button during 2015. For Carmel, the best dry weight was 1.23 g, achieved with BL (30 mg·L^-1) at fallen petals in both seasons. The average dry weight of the controls varied between 1.13 and 1.18 g. The greatest almond lengths and widths in Non Pareil were 24.98 mm and 15.05 mm, achieved with BL (30 mg·L^-1) and KN (50 μL·L^-1) treatments, respectively, applied at pink button in 2015. In Carmel, the greatest length and width were 24.38 and 13.44 mm, obtained with BL (30 mg·L^-1) applied at the stages of pink button and fallen petals, respectively, in 2015. The control reached lengths between 22.33 and 23.38 mm, and widths between 11.99 and 12.93 mm.ConclusionsThe use of the bioregulators showed significant favorable effects on dry weight, length and width of kernels at harvest, in both cultivars.     

神经网络对我国资本市场有效性及非线性的实证研究

通过理论分析和神经网络模型,证明我国股市的收益率存在着可预测性,从而证明弱有效不成立；通过敏感性分析,发现了收益率滞后项对当前收益率的作用方式是非线性的,为我国资本市场的非线性研究提供了佐证。     

国际合作科研经费投入与产出效率的实证分析——以新疆生态地理研究所为例

随着经济的不断发展,科技创新国际化趋势加强,许多重大科研项目需要各国共同完成,国际合作科研项目逐年增加。各科研院所对经费的投入也在不断增加,文章以新疆生态地理研究所为例,分析了国际合作科研项目投入与产出效率的关系。     

试论如何提升高校职业指导效果和效率

在高等教育大众化、就业形势日益严峻的背景下,高校职业指导工作的作用和意义显得尤为重要。以汉中职业技术学院为例,分析了高职院校毕业生职业指导效率不高的原因,提出将精细化职业指导引入高校大学生职业指导体系,探讨了高职院校提升职业指导效果和效率的方法和思路。     

应用数量分类探讨鹅观草属的归属问题

研究全世界鹅观草属只Roegneria C．Koch中绝大多数种类与其有关属(冰草属、披碱草 属、偃麦草属及赖草属)的外部形态、解剖、细胞等30个性状，应用相关系数抑或距离系数以及各种聚类方法组合所得出的树系图，均明确显示鹅观草属应归入披碱草属。     

玄参科Cochlidiosperma Reichenb.属的恢复及其孢粉学证据

  The pollen grains of Cochlidiosperma (Veronica)  hederifolia and  C.  (Veronica) cymbalaria were examined under SEM and TEM. They differ vastly from those of all the others in Veronica (sensu Elenevskij, 1977, 1978).  The taxonomic relationship be- tween the group and the other Veronica spp. is discussed with respect to both gross morphology and pollen characters.  Justification for the restoration of the genus as a valid taxon is argued and, finally, a number of new combinations are proposed.       The group under consideration was sometimes treated as a separate  genus but more often given different ranks in the genus Veronica, which has been a controversial group as to its concept and subdivision.  No detail discussion has been made before on the relationship between the group and Veronica.  Main purpose of the present mork is to examine pollen morphology and gross morphology of the group and to discussits relationship with Veronica.     

首乌藤提取物对动物脂肪酸合酶的抑制及其减肥抑食作用

最新报道脂肪酸合酶（FAS）是治疗肥胖症的潜在靶部位。实验测定表明，中药首乌藤的提取物对FAS具有很强的抑制作用，半抑制浓度为0.61±0.024&#61549;g/ml。同时测定，该提取物对FAS中的酮酰还原反应有强抑制，半抑制浓度为2.14±0.12&#61549;g/ml，说明FAS中的酮酰还原酶是该提取物的作用部位之一。抑制动力学分析表明，首乌藤提取物对FAS的抑制和底物乙酰辅酶A、丙二酸单酰辅酶A之间皆呈非竞争性关系；和NADPH之间在低抑制剂浓度下的表现近似反竞争性，在高抑制剂浓度下接近竞争性的关系。推测首乌藤中可能有多种FAS抑制剂。用首乌藤提取物口服饲喂大鼠和小鼠，可明显减低实验动物的摄食量和体重；测定实验组大鼠肝脏的FAS活性，明显低于对照组。实验结果对于研究FAS抑制剂和抑制机制以及在防治肥胖症的应用上可能具有重要的价值。