α-生育酚琥珀酸酯对过度运动小鼠NK细胞平衡及ApoE基因表达影响研究

通过α-生育酚琥珀酸酯作用于过度运动小鼠,观察其对小鼠NK细胞平衡及ApoE基因表达的影响。结果表明:α-生育酚琥珀酸酯对于克服过度运动小鼠免疫抑制现象具有显著作用,主要表现为CD3+、CD16+、CD56+细胞因子极显著下降(P0.01);ApoE mRNA及ApoE蛋白表达量极显著上升(P0.01)。不同剂量α-生育酚琥珀酸酯作用效果有一定差别,高剂量组NK细胞平衡及ApoE表达显著优于低剂量组(P0.05)。     

DNA条形码技术在肉及其制品中的应用

DNA条形码技术作为一种新的分子生物学检测技术在鉴定和区分各物种和物种间亲缘关系方面得到了广泛应用,该技术能实现对肉的快速、准确检测。DNA条形码已成为生物学领域发展最迅速的一种技术,该技术基于广泛的物种基因数据库信息,在肉品研究中具有良好的应用前景。本文简述DNA条形码技术的基本原理,并基于DNA水平上与其他相关技术进行比较,综述其在物种鉴定、肉品质量安全、商业欺诈等方面的应用,并对该技术在今后肉品科学研究中的应用进行展望。      

Detailed model and investigation of gain saturation and carrier spatial hole burning for a semiconductor optical amplifier with gain clamping by a vertical laser field

A detailed model for semiconductor linear optical amplifiers (LOAs) with gain clamping by a vertical laser field is presented, which accounts the carrier and photon density distribution in the longitudinal direction as well as the facet reflectivity. The photon iterative method is used in the simulation with output amplified spontaneous emission spectrum in the wide band as iterative variables. The gain saturation behaviors and the noise figure are numerically simulated, and the variation of longitudinal carrier density with the input power is presented which is associated with the on-off state of the vertical lasers. The results show that the LOA can have a gain spectrum clamped in a wide wavelength range and have almost the same value of noise figure as that of conventional semiconductor optical amplifiers (SOAs). Numerical results also show that an LOA can have a noise figure about 2 dB less than that of the SOA gain clamped by a distributed Bragg reflector laser.     

电子测量仪器的可靠性鉴定试验

本文主要描述如何进行电子测量仪器可靠性鉴定试验.     

南京市3E系统协调度分析

本文选取1998～2004年南京市的数据为研究样本,运用协同学理论和复合系统原理,构建经济-能源-环境复合系统内各组成子系统之间协调发展的协调度模型,该协调度能反映出3E系统的秩序与结构及其从无序走向有序的趋势,实证分析的结果表明,南京市3E系统在过去的5年中协调程度不断改善,但总体程度不高.     

高强度准双曲面齿轮的新设计方法

提出了突破准双曲面齿轮设计中Gleason齿顶高系数的限制，灵活地选取齿顶高系数，以实现减小齿根的最大拉伸应力及最大压缩应力的新设计方法；同时，在设计中修正正转用齿面的压力角，以增加正转时齿根的强度。利用有限元和边缘接触分析方法，讨论了采用新方法设计出的齿轮副齿根最大拉伸应力、齿根最大压缩应力以及齿面接触应力的变化。实例计算可以看出，新设计方法可增加正转用齿面的强度，减小齿根拉伸应力。     

Rat mature sympathetic neurones derive neurotrophin 3 from peripheral effector tissues

In a previous study we have demonstrated that endogenous neurotrophin 3 (NT3) is required for the survival of most sympathetic neurones in postnatal rats. However, the mechanisms underlying the action of NT3 on sympathetic neurones is not known. Neither is it understood whether NT3 is retrogradely transported from peripheral tissues or acts locally in an autocrine fashion. In the present study, NT3-mRNA was quantified in sympathetic effector tissues and NT3 protein was localized in intact and lesioned sympathetic nerves in rats. NT3-mRNA is expressed and developmentally regulated in many effector tissues including mesenteric arteries, salivary gland, heart and kidney but hardly detectable in the superior cervical ganglia of adult animals. The majority of sympathetic neurones express immunoreactivity for TrkA and TrkC in both neonatal and adult rats. Sympathetic somata are normally immunoreactive for NT3, but the immunoreactivity is abolished by systemic administration of NT3 antibodies or axotomy of postganglionic neurones, suggesting an accumulation of NT3 from extraneuronal sources. Furthermore, the detection of NT3-immunoreactivity in the internal carotid nerve as early as 3 h following a compression and only on the distal side indicates endogenous NT3 is retrogradely transported by sympathetic neurones. These studies provide evidence indicating that NT3, like nerve growth factor, is an effector tissue-derived neurotrophic factor for sympathetic neurones both during development and in the adult animal. Thus, we have provided a clear example that one type of neurone derives, through a retrograde transport mechanism, two neurotrophic factors simultaneously from its peripheral effector tissues.     

基于裸芯片封装的金刚石/铜复合材料基板性能研究

基板是裸芯片封装中热传导的关键环节。随着微电子技术的发展,组件热流密度越来越大,对新型基板材料的要求越来越高,要求具有高的热导率、低的热膨胀系数以及较低的密度。金刚石/铜复合材料作为新一代基板材料正得到愈来愈多的关注。文中分别通过实验和计算机仿真分析了金刚石/铜复合材料的镀覆性、焊接性以及作为基板材料的热性能。结果表明...     

Synthesis and properties of bulk nanocrystalline Mg2Si through ball-milling and reactive hot-pressing

1 Introduction The intermetallic compound Mg2Si is useful as strengthening phase in the metal matrix composites (MMC) due to its low density (1.99 g/cm3) and high strength-to-mass ratio[1?5]. It is also promising as a basic material for thermoelectric ene…     

纳米TiO2染料敏化太阳电池的电极修饰和光电复合研究(英文)

染料敏化太阳电池由于其较高的光电转换效率和低成本等因素正越来越受到人们的重视,当前其技术发展最为核心的问题是如何减少暗电流、进一步提高其光电转换效率.本工作对染料敏化太阳电池的光阳极进行了不同方法的TiCl4修饰处理,测量了各种不同修饰处理下的TiO2太阳电池的光电转换性能.通过248?nm波长的准分子脉冲激光辐照下的开路光电压Uoc随时间的衰减变化关系,研究了单色脉冲激光下的染料敏化TiO2太阳电池的光电子复合效应,从中明确了TiCl4修饰对染料敏化TiO2太阳电池暗电流的调制所起的重要作用.