In this paper, the authors study the existence of nontrivial solutions for the Hamiltonian systems z(t) = J△↓H(t, z(t)) with Lagrangian boundary conditions, where ^H(t,z)=1/2(^B(t)z, z) + ^H(t, z),^B...In this paper, the authors study the existence of nontrivial solutions for the Hamiltonian systems z(t) = J△↓H(t, z(t)) with Lagrangian boundary conditions, where ^H(t,z)=1/2(^B(t)z, z) + ^H(t, z),^B(t) is a semipositive symmetric continuous matrix and ^H(t, z) = satisfies a superquadratic condition at infinity. We also obtain a result about the L-index.展开更多
建立一种采用液相色谱法同时测定亚麻荠植株中8种酚酸和黄酮化合物含量的方法,并探讨亚麻荠植株醇提物的体外抗氧化活性。试验确定采用体积分数75%乙醇回流提取样品,选用Angilent Eclipse XDB plus C_(18)柱为色谱柱。结果表明:8种化合...建立一种采用液相色谱法同时测定亚麻荠植株中8种酚酸和黄酮化合物含量的方法,并探讨亚麻荠植株醇提物的体外抗氧化活性。试验确定采用体积分数75%乙醇回流提取样品,选用Angilent Eclipse XDB plus C_(18)柱为色谱柱。结果表明:8种化合物的标准曲线回归方程线性关系良好,相关系数均大于0.999;8种化合物的加标回收率为95.26%~102.61%,建立的方法可以对不同产地的亚麻荠植株样品进行区分。抗氧化试验表明,亚麻荠植株醇提取物对羟基自由基与DPPH自由基具有较好的清除能力。展开更多
基金supported by the National Natural Science Foundation of China (Nos. 10531050, 10621101)the 973 Project of the Ministry of Science and Technology of China.
文摘In this paper, the authors study the existence of nontrivial solutions for the Hamiltonian systems z(t) = J△↓H(t, z(t)) with Lagrangian boundary conditions, where ^H(t,z)=1/2(^B(t)z, z) + ^H(t, z),^B(t) is a semipositive symmetric continuous matrix and ^H(t, z) = satisfies a superquadratic condition at infinity. We also obtain a result about the L-index.
文摘建立一种采用液相色谱法同时测定亚麻荠植株中8种酚酸和黄酮化合物含量的方法,并探讨亚麻荠植株醇提物的体外抗氧化活性。试验确定采用体积分数75%乙醇回流提取样品,选用Angilent Eclipse XDB plus C_(18)柱为色谱柱。结果表明:8种化合物的标准曲线回归方程线性关系良好,相关系数均大于0.999;8种化合物的加标回收率为95.26%~102.61%,建立的方法可以对不同产地的亚麻荠植株样品进行区分。抗氧化试验表明,亚麻荠植株醇提取物对羟基自由基与DPPH自由基具有较好的清除能力。