Characterization of the porcine differentially expressed PDK4 gene and association with meat quality

To investigate the differential expression of genes in the skeletal muscle between Yorkshire and Chinese indigenous breed Meishan pigs, suppression subtractive hybridization was carried out and many genes were proved to be expressed significantly different in the two breeds. One gene highly expressed in Meishan but lowly expressed in Yorkshire specific library, shared strong homology with human pyruvate dehydrogenase kinase 4 (PDK4). Using semi-quantity and quantity PCR, We confirmed its differential expression between the two breeds. Temporal and spatial expression analysis indicated that porcine PDK4 gene is highly expressed in skeletal muscle and the highest in neonatal pigs. Complete cDNA cloning and sequence analysis revealed that porcine PDK4 gene contains an open reading frame of 1,221 bp. The deduced amino acid sequence showed conservation in evolution. A G/A mutation in intron 9 was identified and association analysis showed that it was significantly associated with intramuscular fat, muscle water content.

固态量子信息研究若干新进展

在国家自然科学基金和国家重点基础研究专项经费（“973”项目）资助下，自2003年以来，中国科学院半导体研究所固态量子信息课题组在固态量子信息研究中取得了一些新进展。本文对这些进展作一些简单介绍。

一种新型垂直外腔面发射半导体激光器

概述了近几年国外发展起来的一种新型半导体激光器光源:垂直外腔面发射激光器,详细介绍了它在光束质量方面的优点,研制方法以及工艺上的特点.

半导体纳米材料和物理

半导体纳米材料是纳米材料的一个重要组成部分，纳米结构的电子和光子器件将成为下一代微电子和光电子器件的核心。文章介绍了半导体纳米材料的新进展，包括四个方面：半导体自组织生长量子点，纳米晶体，微腔光子晶体和纳米结构中的自旋电子学。本世纪开始的半导体纳米材料的是上世纪半导体超晶格量子阱研究的延续，同时双开辟了一些新领域，如：单电子的电子学、单光子的光子学，微腔和光子晶体，稀磁半导体和自旋电子的相干输运等，这些研究将为研制在新原理基础上的新器件和实现量子计算、量子通信打下基础。

电吸收调制器和DFB激光器集成器件的测量

提出了一种测量电吸收调制器和激光器集成器件芯片散射参数的新方法。根据电吸收调制器和封装寄生参数的等效电路模型，对测量的反射系数进行拟合，得到封装寄生参数和电吸收调制器的等效电路元件的参数值。通过分析发现测试封装寄生参数对电吸收调制器的测试结果有很大影响。去除了封装寄生参数的影响后，得到了调制器的反射和传输参数的真实频响特性。

泵浦用大功率半导体激光器研制与应用发展状况

详尽地介绍了当前可以使用半导体泵浦的固体激光器泵浦要求，相应的半导体泵浦源的发展状况，存在的问题，最后介绍了列阵和耦合两种提高半导体泵浦源功率，改善其光速质量的方法。

Long-wavelength SiGe/Si MQW resonant-cavity-enhanced photodetectors (RCE-PD) for application in optical fiber communication network

　

Quantum dynamics of coupled quantum-dot qubits and dephasing effects induced by detections