Neuroglobin mutation associated with hypoxia adaptation in Tibet chicken

Globin protein family plays an important role in storing and transporting oxygen. As a newly reported globin, the revealed function of neuroglobin includes binding and storing oxygen as well as facilitating the utilization of oxygen in neuronal cells. In the present study, mutations in exons of chicken Ngb gene were identified with the method of sequencing and created restriction site PCR in Tibet chicken and other four lowland chicken breeds. The mutations of Lys-2224(E4)-Asn and Ser-2279(E4)-Gly were identified in exon 4 of the gene. The Lys-2224(E4)-Asn mutation existed only in Tibet chicken and the mutation frequencies increased with increasing altitude. Analysis of the haplotype and diplotype of the two mutations in Tibet chicken populations of different altitudes showed that the frequencies of TG haplotype and TTGG diplotype also increased with increasing altitude, while the reverse tendency was found on GGAA diplotype. Under the hypoxic simulation incubation, the main haplotype was TG in living embryos and GA in dead embryos. The results showed that the Lys-2224(E4)-Asn mutation may be a specific mutation associated with hypoxia adaptation in Tibet chicken.     

太白山蝗虫的垂直分布及区系分析

太白山的蝗虫有２总科、７科、３４种，分布于８个垂直带．以１３００～１８００ｍ的锐齿栎林带最多，７２０～１３００ｍ的栓皮栎林带次之，１８００～２３００ｍ的辽东栎林带居第三，７２０ｍ以下的农耕带为第四，２３００ｍ以上较少．其区系为古北界与东洋界过渡地带，以东洋界为主．     

螺旋叶片成形胎具的一种设计方法

运用解析几何方法，从等螺距旋面和螺旋线的参数方程入手，采用坐标系旋转等方面得出螺旋面的有关特性，并根据这些特性提出一种螺旋叶片水平形成胎具的设计方法，使一胎具即可压制多种导程的螺旋叶片。     

An Exact Logarithmic-exponential Multiplier Penalty Function

In this paper, we give a solving approach based on a logarithmic-exponential multiplier penalty function for the constrained minimization problem. It is proved exact in the sense that the global optimizers of a nonlinear problem are precisely the global optimizers of the logarithmic-exponential multiplier penalty problem.     

Fe3N和Fe2N体状化合物合成及其磁特性

纯铁粉在一定比例的氨和氢的气氛中与氮可以固气反应形成Ｆｅ３Ｎ和Ｆｅ２Ｎ体状化合物，研究了氨气和氢气的比例，温度和时间对反应产物的影响规律，进而确定了形成单一均匀的体状Ｆｅ３Ｎ和Ｆｅ２Ｎ化合物的条件，利用振动样品磁强计，磁天平和热磁分析等手段检测了Ｆｅ３Ｎ和Ｆｅ２Ｎ的磁特性Ｆｅ３Ｎ化合物饱和磁化强度（室温）为１３４Ａｍ＾２／ｋｇ居里温度为２６０℃而Ｆｅ２Ｎ化合物饱和磁化强度为２３．１Ａｍ＾２／ｋｇ属     

δ—癸内酯的合成研究

报道了用环戊酮与戊醛经缩合，脱水，加氢及Baeyer-Villiger氧化反应合成δ－癸内酯的方法，总产率为51．36％。     

电解二氧化锰时电解液体系中间粒子的考察

用紫外分光光度法及X射线衍射发现,电解体系中存在着Mn~(3+)、MnO_4-及[Mn_2(SO_4)_3)~(2-)络离子。用电子计异机求出电解MnO_2时体系中一些中间粒子的浓度,得到一些新的结果。     

CA142 后轮罩应力应变分析

在解决大型复杂形状冲压件，尤其是汽车覆盖件的冲压生产技术问题时，圆网格方法已卓有成效。但对成形量小的浅拉延件，传统的圆网格法已不能满足要求。本文以ＣＡ１４２汽车后轮罩为对象，利用一种新的网格方法，计算了应变、应力等高线，分析了后轮罩出现冲压缺陷的原因。     

“最优化投入产出企业模型”的探讨

本文利用线性规划的基本理论,在投入产出模型的基础上,提出了最优化投入产出企业模型并在微型计算机上编制了相应的算法。对于合理利用有限的资源,使企业产品成本最低,销售利润最大,优化企业的生产计划,具有普遍意义。该模型可在钢铁、化工、纺织、机械等行业的大中型企业广泛应用。