The"Hainan Tour"event for foreignfunded enterprises,which was jointly hosted by the CCPIT and the government of Hainan Province,has recently been closed.Over 30 foreign-funded enterprises have reached cooper...The"Hainan Tour"event for foreignfunded enterprises,which was jointly hosted by the CCPIT and the government of Hainan Province,has recently been closed.Over 30 foreign-funded enterprises have reached cooperation intentions with relevant institutions from Hainan Province.展开更多
Phosphorus(P) starvation in rice facilitates the reutilization of root cell wall P by enhancing the pectin content. NaCl modulates pectin content, however, it is still unknown whether NaCl is also involved in the proc...Phosphorus(P) starvation in rice facilitates the reutilization of root cell wall P by enhancing the pectin content. NaCl modulates pectin content, however, it is still unknown whether NaCl is also involved in the process of pectin regulated cell wall P remobilization in rice under P starved conditions. In this study, we found that 10 mmol/L NaCl increased the shoot and root biomasses under P deficiency to a remarkable extent, in company with the elevated shoot and root soluble P contents in rice. Further analysis indicated that exogenous NaCl enhanced the root cell wall P mobilization by increasing the pectin methylesterase activity and uronic acid content in pectin suggesting the involvement of NaCl in the process of cell wall P reutilization in P starved rice roots. Additionally, exogenous NaCl up-regulated the expression of P transporter OsPT6, which was induced by P deficiency, suggesting that NaCl also facilitated the P translocation prominently from root to shoot in P starved rice. Moreover, exogenous abscisic acid(ABA) can reverse the NaCl-mediated mitigation under P deficiency, indicating the involvement of ABA in the NaCl regulated root cell wall P reutilization. Taken together, our results demonstrated that NaCl can activate the reutilization of root cell wall P in P starved rice, which is dependent on the ABA accumulation pathway.展开更多
单隐层前馈神经网络是一种高效且结构简单的神经网络,它的一种典型的学习算法就是误差反向传播(error back propagation,BP)算法.这种算法基于最速下降法原理,主要缺点是学习速度过慢.超限学习机(extreme learning machine,ELM)极大地...单隐层前馈神经网络是一种高效且结构简单的神经网络,它的一种典型的学习算法就是误差反向传播(error back propagation,BP)算法.这种算法基于最速下降法原理,主要缺点是学习速度过慢.超限学习机(extreme learning machine,ELM)极大地优化了单隐层神经网络的学习速度,却需要更多的隐层单元来达到与BP网络相当的效率,这不可避免地使网络结构冗余、测试时间变长.受到一种结合了ELM和最速下降法思想的USA(upper-layer-solution-aware)算法的启发,提出一种基于共轭梯度法的单隐层神经网络快速算法,并把它应用于不同数据库中.试验结果表明,在相同网络结构情况下,本算法的效率要优于ELM和USA算法.展开更多
文摘The"Hainan Tour"event for foreignfunded enterprises,which was jointly hosted by the CCPIT and the government of Hainan Province,has recently been closed.Over 30 foreign-funded enterprises have reached cooperation intentions with relevant institutions from Hainan Province.
基金supported by the Foundation for Distinguished Young Scholars of Jiangsu Province,China(Grant No.BK20190050)Zhejiang Provincial Natural Science Foundation of China(Grant No.LY22C130004)the Youth Innovation Promotion Association of Chinese Academy of Sciences(Grant No.2015250)。
文摘Phosphorus(P) starvation in rice facilitates the reutilization of root cell wall P by enhancing the pectin content. NaCl modulates pectin content, however, it is still unknown whether NaCl is also involved in the process of pectin regulated cell wall P remobilization in rice under P starved conditions. In this study, we found that 10 mmol/L NaCl increased the shoot and root biomasses under P deficiency to a remarkable extent, in company with the elevated shoot and root soluble P contents in rice. Further analysis indicated that exogenous NaCl enhanced the root cell wall P mobilization by increasing the pectin methylesterase activity and uronic acid content in pectin suggesting the involvement of NaCl in the process of cell wall P reutilization in P starved rice roots. Additionally, exogenous NaCl up-regulated the expression of P transporter OsPT6, which was induced by P deficiency, suggesting that NaCl also facilitated the P translocation prominently from root to shoot in P starved rice. Moreover, exogenous abscisic acid(ABA) can reverse the NaCl-mediated mitigation under P deficiency, indicating the involvement of ABA in the NaCl regulated root cell wall P reutilization. Taken together, our results demonstrated that NaCl can activate the reutilization of root cell wall P in P starved rice, which is dependent on the ABA accumulation pathway.
文摘单隐层前馈神经网络是一种高效且结构简单的神经网络,它的一种典型的学习算法就是误差反向传播(error back propagation,BP)算法.这种算法基于最速下降法原理,主要缺点是学习速度过慢.超限学习机(extreme learning machine,ELM)极大地优化了单隐层神经网络的学习速度,却需要更多的隐层单元来达到与BP网络相当的效率,这不可避免地使网络结构冗余、测试时间变长.受到一种结合了ELM和最速下降法思想的USA(upper-layer-solution-aware)算法的启发,提出一种基于共轭梯度法的单隐层神经网络快速算法,并把它应用于不同数据库中.试验结果表明,在相同网络结构情况下,本算法的效率要优于ELM和USA算法.
