The nonlinear evolution equation on the shallow water wave

Based on the variation principle, the nonlinear evolution model for the shallow water waves is established. The research shows the Duffing equation can be introduced to the evolution model of water wave with time.

南通幅区域地球物理场特征研究

“十五”期间，“1:100万南通幅海洋区域地质调查”项目在32°N～36°N，120°E～126°E的海域范围内开展了区域性重力、磁力及地震测量等工作，为该区及邻域的地质地球物理研究工作提供了详实可靠全面的基础地质数据。本文以这些实测资料为基础，从数据采集入手，以合理规范的方法步骤对重力、磁力数据进行了处理，获得了研究区重力、磁力异常信息。结合卫星测高重力数据与以往调查数据，编制了研究区自由空间重力异常图、布格重力异常图和磁力（△T）异常图。 根据重力异常图反映的研究区重力异常基本特征，将南通幅及邻区划分为5个重力异常分区，对每一分区的重力异常特征进行了详尽阐述。分析了引起重力异常的因素，描述了岩石密度特征，反演了莫霍面深度，计算了均衡异常。对布格重力异常进行了向上延拓处理。 以编制的磁力异常图为基础，描述了区域磁异常背景，对围区岩石磁性特征和磁性基底特征进行了分析。将南通幅及邻区划分为3个磁力异常分区，阐述了每一分区的磁力异常特征并进行了地质解释。 最后，以实测多道地震剖面的解释成果建立的地质模型为基础，进行了重磁震联合反演。

一种新的氧合球蛋白-神经球蛋白

神经球蛋白（neuroglobin, NGB）是最近发现的一种新的可以和氧可逆性结合的血红蛋白家族成员，主要表达于脊椎动物的脑中。NGB蛋白是由151个氨基酸组成的单体蛋白，有着古老的进化起源。迄今为止，已证明它具有储存、转运氧气和保护神经细胞的功能。NGB基因的表达调节至少有两条信号转导途径参与。NGB的发现为中风等缺氧相关疾病的治疗提供了新的方向。

生物措施对柴达木盆地弃耕盐碱地效应分析

利用生物技术改良柴达木盆地弃耕盐碱地，3年结果表明，全盐量随着苜蓿种植年限的增加而降低。0～30cm耕作层全盐量由试验前的1.518%下降到0.126%，脱盐率在91.7%，盐分表聚现象已不明显。土壤盐分季节变化呈U型曲线，建植人工草地后，初级生产力明显提高。试验区植物群落的物种数、多样性指数、均匀度均高于对照区。

Diploid and tetraploid distribution of Allium przewalskianum Regel. (Liliaceae) in the Qinghai-Tibetan Plateau and adjacent regions

Polyploidization plays an important role in generating the current high diversity of plants. Studies of distributional patterns of diploids and derivative autopolyploids have provided important insights into evolutionary processes and cryptic speciation of polyploidization within species defined on the basis of their morphology. However, few studies have been designed to examine distributions of infrageneric diploids and polyploids on the Asian Qinghai-Tibetan Plateau (QTP). Allium przewalskianum occurs widely on the QTP and in adjacent regions, at altitudes ranging from 2000m to 4500m. We collected a total of 844 individuals from 62 populations and determined their cytotypes over the entire distribution range of this species. Tetraploids tend to occur at high altitudes; however, the positive relationship between the ploidy and altitude was only marginally significant (P < 0.05). Contact zones between diploids and tetraploids were recorded on the eastern QTP from north to south. Four populations were found to harbor both cytotypes, but no triploid individuals. The wider distribution of tetraploids may be mainly due to their greater colonization ability in the new niches created by the Quaternary climatic oscillations in the QTP region. Our results offer a fundamental framework for studying evolutionary origins, adaptations and cryptic divergences of polyploids within this species complex based on molecular and/or ecological examinations in the future.