基于哈德曼编码的新型高分辨定域谱

核磁共振（NMR）技术作为一种非植入无损伤的检测技术,已经广泛应用于化学、生物和医学等领域.本文基于哈德曼（Hadamard）编码的分子间单量子相干（iSQC）技术提出了一种新的序列,首先从理论上对该序列进行了简要的分析并阐明其原理,然后用套管模型实验和脑模型实验验证该序列在不均匀磁场下准确定域和快速获取高分辨谱的能力.实验表明,该序列在不均匀磁场下可以快速获取高分辨定域谱,同时抑制溶剂峰信号,具备一定的应用价值.     

镥铕共发光时间分辨荧光免疫法检测嗜水气单胞菌

建立了共发光时间分辨荧光免疫检测嗜水气单胞菌的新方法,以嗜水气单胞菌菌株B11包被微孔板,与Eu3+标记的兔抗IgG免疫反应后,加入含有共发光离子Lu3+的解离增强剂,由于Eu3+和Lu3络合物的共发光效应,时间分辨荧光大大增强,有效放大了检测信号,提高了检测灵敏度.优化了共发光体系的条件,方法的检出限为1.0×103...     

时间分辨荧光免疫分析高灵敏检测嗜水气单胞菌

建立了生物素-链霉亲和素时间分辨荧光免疫分析（BAS-TRFIA）高灵敏检测嗜水气单胞菌的新方法.以兔抗IgG包被微孔板,加入嗜水气单胞菌菌株B18和生物素化IgG,生成的夹心复合物用Eu³⁺-链霉亲和素作为示踪物,Eu³⁺可与离解增强液形成时间分辨荧光（TRF）,通过TRF值对病原菌定量.方法的检测限为1.0×10² cfu/mL,在1.0×10~1.0×10⁶ cfu/mL范围内线性良好,相关系数0.9716.用该法检测时,不同来源的嗜水气单胞菌以及其它气单胞菌均呈阴性.板内和板间的变异系数分别小于5.00%和9.00%.所有相关检测试剂37℃恒温放置6 d后,检测性能无明显改变.对60份人工感染的美洲鳗鲡组织样品,包括肝、肾、肠、鳃和肌肉等组织进行检测,阳性检测率为98.33%.结果表明,BAS-TRFIA法检测嗜水气单胞菌,灵敏度高、特异性好、操作简便,该方法为水产养殖病原菌检测提供了新的思路.     

一类时滞脉冲微分方程的概周期解的存在性

运用锥上的不动点定理，研究一类脉冲时滞微分方程的概周期解，得到了保证系统存在概周期解的一组充分条件。     

On the Monomer–Dimer Problem of Some Graphs

The pure-dimer problem was solved in exact closed form for many lattice graphs. Although some numerical solutions of the monomer–dimer problem were obtained, no exact solutions of the monomer–dimer problem were available (except in one dimension). Let G be an arbitrary graph with N vertices. Construct a new graph R ( G ) from G by adding a new verex e * corresponding to each edge e = ( a , b ) of G and by joining each new vertex e * to the vertices a and b . If the suitable activities of vertices and edges in R ( G ) are selected, then the monomer–dimer problem can be solved exactly for the graph R ( G ), which generalizes the result obtained by Yan and Yeh. As applications, if we select suitable activities for the vertices and edges of     , we obtain the exact formulae for the MD partition function, MD free energy, and MD entropy of     for the d -dimensional lattice     with periodic boundaries.     

Exponential p-stability of delayed Cohen–Grossberg-type BAM neural networks with impulses

An impulsive Cohen–Grossberg-type bidirectional associative memory (BAM) neural networks with distributed delays is studied. Some new sufficient conditions are established for the existence and global exponential stability of a unique equilibrium without strict conditions imposed on self regulation functions. The approaches are based on Laypunov–Kravsovskii functional and homeomorphism theory. When our results are applied to the BAM neural networks, our results generalize some previously known results. It is believed that these results are significant and useful for the design and applications of Cohen–Grossberg-type bidirectional associative memory networks.     

On the extended KdV equation with self-consistent sources

The positive extended KdV equation with self-consistent sources (eKdV⁺ ESCSs) is firstly presented and its related linear auxiliary equation is derived. The generalized binary Darboux transformation (DT) is applied to construct some new solutions of the eKdV⁺ ESCSs such as N-soliton solution, N-double pole solution and nonsingular N-positon solution. The properties of these solutions are analyzed. Moreover, the interaction of two solitons is discussed in detail.     

On Coupled KdV Equations with Self-consistent Sources

The coupled Korteweg-de Vries （CKdV） equation with self-consistent sources （CKdVESCS） and its Lax representation are derived. We present a generalized binary Darboux transformation （GBDT） with an arbitrary time- dependent function for the CKdVESCS as well as the formula for the N-times repeated GBDT. This GBDT provides non-auto-Biicklund transformation between two CKdVESCSs with different degrees of sources and enables us to construct more generM solutions with N arbitrary t-dependent functions. We obtain positon, negaton, complexiton, and negaton- positon solutions of the CKdVESCS.     

鲟鱼和鲨鱼硫酸软骨素红外光谱特性的比较研究

文章比较研究了鲟鱼和鲨鱼硫酸软骨素的红外光谱特性。结果表明,鲟鱼硫酸软骨素在1 376, 1 344, 1 310, 1 157, 883和856 cm-1等波数上呈现出特有的振动峰,进一步的分析表明,鲨鱼硫酸软骨素中只有6-硫酸基团,而鲟鱼硫酸软骨素中则同时存在有6-硫酸基团和4-硫酸基团,这一特点表明鲟鱼硫酸软骨素在降低药物的毒性,有效杀伤癌细胞的方面可能具有较高的生物活性;两种硫酸软骨素的红外光谱总体基本相似,都含有乙酰氨基、羧基、硫酸基、糖环等官能团的振动峰,但鲟鱼硫酸软骨素的乙酰氨基的N—H变角振动峰的波数较高,1 415 cm-1处的羧基振动峰也明显强于鲨鱼硫酸软骨素,进一步化学分析显示,鲟鱼硫酸软骨素中的葡萄糖醛酸含量较高,推测鲟鱼硫酸软骨素很可能是一种较好的医用骨骼修复材料。