摘要：采用硅胶柱色谱、Sephadex LH-20凝胶柱色谱以及重结晶等方法,从海洋来源真菌Penicillium sacculum发酵液的乙酸乙酯萃取部分中分离得到2个聚酮类化合物:Griseophenone B(Ⅰ)和Griseophenone C(Ⅱ),通过1DNMR和2DNMR(HSQC,HMBC)等技术确定了化合物的结构。首次报道了化合物Ⅰ的13 CNMR数据以及化合物Ⅱ的核磁共振数据,并利用2DNMR技术对2个化合物的核磁共振信号进行了归属。化合物Ⅱ为首次从该种真菌中分离得到。

摘要：[Objective] This study aimed to clone the porcine growth hormone gene promoter and determine the core promoter sequences and the cis-acting elements. [Method] Sequence of the 5＇flanking region of porcine growth hormone gene was searched out and downloaded from the NCBI website. According to the targeted se- quence, primers were designed and synthesized for the PCR amplification. The 1 882 bp （-1 821 bp-＋61 bp） fragment was amplified by PCR. Nine promoter frag- ments with different lengths were obtained by genome-walking deletion method and then cloned into luciferase reporter vectors. Relative transcriptional activities of these 5＇ terminal-deleted plasmids in pituitary and non-pituitary cells were determined by transient transfection of the rat pituitary adenoma cell （GH3）, porcine lilac endotheli- um cell （PIEC） and porcrne Kidney-15 （PK15） with the constructed dual-luciferase vectors. [Result] Result of DNA sequencing showed that the 1 882 bp fragment of GH 5＇ promoter was successfully cloned. Nine luciferase reporter gene plasmids were constructed. DuaI-Luciferase reporter assay indicated that the promoter inserted into reporter gene vector had very strong cell specificity. [Conclusion] Porcine growth hormone gene specifically expresses in pituitary cells. The minimal promoter of the porcine growth hormone gene is mapped at the region -110 bp-＋61 bp. Promoter regions 218 bp--110 bp and -429 bp--218 bp contain positive regulatory elements.

摘要：为解决多用户MIMO-OFDM(Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing)下行链路系统中由于分层设计信息不完整造成的资源分配不合理的问题,提出了一种基于最低速率约束的跨层资源分配算法。该算法综合考虑不同用户服务质量要求、媒体接入控制层队列情况和物理层信道状态信息,在满足总功率限制和用户最低速率约束的条件下,以系统吞吐量最大化为目标,进行物理层子载波和功率的联合分配。仿真结果表明,该算法不仅能满足不同用户的服务质量要求,而且能达到较高的系统吞吐量。

摘要：[目的]克隆猪生长激素启动子,确定其启动子核心序列和主要的顺式作用元件。[方法]根据NCBI上公布的序列设计引物,PCR扩增了猪生长激素5’端-1 821～+61 bp的序列,并通过移步缺失的方法,获得9段长短不一的启动子序列,将其分别构建到双荧光素酶表达载体pGL3-basic上。通过重组质粒瞬时转染大鼠垂体瘤细胞(GH3)、猪髋动脉血管内皮细胞(PIEC)和猪肾细胞(PK15)和转染后细胞荧光素酶活性的测定,检测这些5’末端缺失质粒在垂体及非垂体细胞中的相对转录活性。[结果]成功扩增了猪GH基因5’上游启动区1 882 bp的片段,并构建了9个pGL3-mGH promoter报告基因载体;双荧光素酶报告基因检测系统证实插入报告基因载体中的启动子具有非常强的细胞特异性。[结论]猪生长激素特异性在垂体细胞中表达,其最小启动子位于-110 bp以内,启动子区-218～-110 bp和-429～-218 bp间存在正向调控元件。

摘要：针对SIFT匹配算法存在误匹配的情况,提出了一种基于三角形相似的匹配特征点过滤算法,即在SIFT算法中使用欧式距离判断特征点相似性后,对匹配的特征点构造三角形,通过判别三角形相似对匹配特征点进行进一步过滤。实验结果表明,三角形相似算法能大大提高匹配精度。