Molecular cloning and sequence analysis of the gene encoding interleukin‐6 of the giant panda (Ailuropoda melanoleuca)

In the present study, the cloning and sequence analysis of interleukin‐6 (IL‐6) from the giant panda (Ailuropoda melanoleuca) were described. Sequencing revealed that IL‐6 complementary DNA contains a 636 base‐pair open reading frame encoding 211 amino acids. Homology analyses indicated that the identity levels of nucleotide and deduced amino acid sequences of IL‐6 between the giant panda and other species in Carnivora ranged from 90.5% to 85.6% and from 82.9% to 76.5%, respectively. Phylogenetic analyses based on nucleotide and amino acid sequences showed that the harbour seal shared a closer relationship with the giant panda than other carnivores (ursids not included). The functionally important domains and sites that have previously been recognized in other carnivores were all observed in the IL‐6 sequence of the giant panda. These findings suggest that the complementary DNA fragment cloned is indeed the IL‐6 molecule with biological activity and can be used in immunological studies of the giant panda.     

耗散KDV型方程的渐近吸引子

摘 要:本文考虑了耗散KDV型方程 的渐近吸引子,即构造了一个有限维解序列.首先利用数学归纳法证明了该解序列不会远离方程的整体吸引子；其次，证明了它在长时间后无限趋于方程的整体吸引子, 并且给出了渐近吸引子的维数估计.     

一类二维非线性周期微分方程在退化平衡点的约化

考虑一类二维周期微分方程在退化平衡点附近小扰动下的约化问题.通过引入外部参数,对系统进行仿线性周期变换,将问题化成具有外部参数的系统的约化问题,再由隐函数定理和拓扑度性质,得到原方程的一个约化的标准型.此外,在零点附近得到了一个周期解.     

Mitochondria1 cytochromeb sequences variation of Protura and molecular systematics of Apterygota

Mitochondrial cytochromeb genes of about 450 bp fragments from 3 proturan species, 5 collembolan species and 2 dipluran species have been sequenced. The number of nucleotide substitutions and Kimura 2-parameter distances have also been calculated, and a series of molecular phylogenetic trees reconstructed by using parsimony and distance methods. The proturan, collembolan and dipluran species have evolved monophyletic groups. The results suggest that Protura and Collembola are sister groups, while Diplura is more or less demonstrating a closer phylogenetic relationship to the pterygotan insects. The phylogeny and their systematic position of protura and other groups are also discussed.     

STEL—2000A在扩频通信产品设计中的应用

介绍了扩频芯片ＳＴＥＬ－２０００Ａ的主要性能，并以ＳＴＥＬ－２０００Ａ为核心设计了扩频通信产品的扩频模块，给出了单片机８０５１与ＳＴＥＬ－２０００Ａ，ＥＰＲＯＭ，ＲＡＭ，ＰＬＬ３００－４５的接口电路，实验证明这些外围电路简单可靠，在产品设计中得到了实际应用。     

Short-range linkage relationships, genomic organisation and sequence comparisons of a cluster of five HSP70 genes in Fugu rubripes

Twelve cosmids containing sequences resembling genes encoding members of the 70-kDa heat-shock protein family, HSP70, have been isolated from Fugu rubripes. They can be broadly divided into three groups of overlapping cosmids. Restriction analysis and sequencing of one set of five cosmids have revealed five intronless Fugu HSP70 genes spanning 42 kb, arranged in a combined head-to-head, tail-to-tail and head-to-tail orientation. The levels of DNA and amino acid identity are very high with respect to one another, and are most similar to HSP70 sequences linked to the major histocompatibility complex (MHC) region in other species. Putative heat-shock consensus elements are identified. Non-HSP70 sequences with homology to known genes have been found physically linked to this Fugu HSP70 cluster: the Drosophila melanogaster SOL gene, the Drosophila melanogaster nemo gene, the Caenorhabditis elegans T17E9.1 gene and the sequence encoding the serine protease domain. The linkage relationships described here so far bear no resemblance to those of HSP70 in other organisms. Convergence of mammalian HSP70 and MHC class I and II loci probably occurred after fish had diverged. Received 17 November 1998; received after revision 25 February 1999; accepted 26 February 1999     

多曲线回归方法及计算机应用

利用方程迭代法， 研究并开发了实测资料非线性多族对应关系的多曲线计算机回归分析程序； 对宁夏青铜峡灌区实测水量资料进行了回归计算， 所得成果与手工整编成果吻合很好， 为灌区水量资料整编工作全面电算化奠定了基础。     

解矩阵方程AX＋YB=D与AX＋XB=D的迭代方法

讨论了矩阵方程ＡＸ＋ＹＢ＝Ｄ与ＡＸ＋ＸＢ＝Ｄ的迭代算法，给出了算法收敛的充分必要条件，最后编制了实例在计算机上进行了验证     

函数f(x)=1/(1+x)的迭代表达式序列及其收敛性定理

讨论了函数ｆ（ｘ）＝１／（１＋ｘ）的迭代表达式的表示形式，并应用这一表示形式证明了一个数学实验结果     

Orlicz序列空间的全连续性质

本文给出了Ｏｒｌｉｃｚ序列空间具有全连续性质ＣＣＰ的充分必要条件。结果显示在Ｏｒｌｉｃｚ序列空间中，ＲＮＰ、ＰＣＰ、ＣＰＣＰ性质与ＣＣＰ性质等价。