The stripe-backed weasel Mustela strigidorsa: taxonomy, ecology, distribution and status

1. The stripe-backed weasel Mustela strigidorsa is one of the rarest and least-known mustelids in the world. Its phylogenetic relationships with other Mustela species remain controversial, though several unique morphological features distinguish it from congeners. 2. It probably lives mainly in evergreen forests in hills and mountains, but has also been recorded from plains forest, dense scrub, secondary forest, grassland and farmland. Known sites range in altitude from 90 m to 2500 m. Data are insufficient to distinguish between habitat and altitudes which support populations, and those where only dispersing animals may occur. 3. It has been confirmed from many localities in north-east India, north and central Myanmar, south China, north Thailand, north and central Laos, and north and central Vietnam. Given the limited survey effort, the number of recent records shows that the species is not as rare as hitherto believed. Neither specific nor urgent conservation needs are apparent.

Lentivirus介导神经营养因子- 3促进脊髓损伤大鼠功能恢复

　目的　探讨Lentivirus介导分泌神经营养因子- 3 (NT - 3)直接体内转基因治疗大鼠脊髓损伤作用和机制。　方法　将28只Wistar大鼠在T10水平制成半横断损伤模型,随机分为体内转基因治疗组和损伤对照组,每组14只;用携带NT - 3和绿色荧光蛋白(GFP)的Lentivirus对大鼠行直接体内转基因治疗;荧光显微镜观察体内转基因表达,后肢运动功能评分法(BBB评分) 检测大鼠后肢功能恢复情况。　结果　用荧光显微镜检测到损伤脊髓内有较多的持续表达转基因的细胞; BBB评分结果显示,从伤后第4周开始,实验组大鼠后肢功能较对照组明显恢复( P < 0. 01) ,至第10周时,实验组和对照组BBB分差增大,达3. 3分。　结论　Lentivirus是一种有效的转基因载体,由Lentivirus介导分泌NT - 3的直接体内转基因治疗能够明显促进损伤脊髓的功能恢复。

他克莫司对UVA照射后HaCaT细胞增殖的影响

　目的　探讨不同浓度他克莫司(TM)对不同强度长波紫外线(UVA)照射HaCaT细胞24h和48h后细胞 增殖活性的影响。方法将培养的HaCaT细胞分别行2, 4 和8J / cm2 的UVA 照射,且照射前1h 分别加入50, 500 和 5 000pg/mL的TM,对照组分别加入50, 500和5 000pg/mL的TM,但不行UVA照射。各剂量组分别照射24h和48h后在 倒置相差显微镜下观察细胞的形态变化,MTT法检测细胞的增殖活性。结果　HaCaT细胞经UVA照射24h后,细胞连接 松散,细胞折光性较未照射组差,部分细胞死亡、脱壁;与未经UVA照射组相比,细胞增殖受到抑制( P < 0. 05) ,加入TM 组无明显变化( P > 0. 05) ;照射48h后细胞虽有大量增殖,但体积较小;与未经UVA 照射组相比,细胞增殖明显( P < 0. 05) ,加入TM组细胞增殖受到抑制(P < 0. 05) 。结论　TM可抑制UVA照射HaCaT细胞引起的过度增殖,对UVA照射 后的HaCaT细胞有保护作用。

Effect of cavitations on brittle-ductile transition of particle toughened thermoplastics

In this study, we established a correlation between cavitations volume and the brittle-ductile transition (BDT) for particle toughened thermoplastics. The brittle-ductile transition temperature (T-BD) was calculated as a function of T* and interparticle distance (ED), respectively, where T* was a parameter related to the volume of cavitations. The results showed that the smaller the cavitations volume, the higher the brittle-ductile transition temperature. The calculations correlated well with the experimental data. With respect to rubber particle, the rigid particle was too hard to be voided during deformation, thereby the TED of the blend was much higher than that of rubber particle toughened thermoplastic. This was a main reason that rubber particle could toughen thermoplastics effectively, whereas rigid particle could not.

一种基于多项式的图像离焦建模方法研究

本文针对显微视觉的图像恢复与3D 重建问题,从显微光学成像的离焦机理和基于点扩散函数的图像模糊化描述出发,通过模糊测度算子分析序列显微图像的离焦分布规律,提出了一种用于构建较为精准离焦模型的方法。该模型采用混合参数多项式结构,与传统高斯模型相比,可以更接近真实离焦过程,这为较为精确的光学显微图像恢复和3D 重构提供了新的技术途径。

高速公路收费系统联网技术

结合目前我国高速公路通信传输网络的建设现状和收费系统数据通信的需求，从 结构、性能等方面分析了适应高速公路通信的3种网络技术SDH、ATM和宽带IP技术，以及这 3 种技术的综合集成模型ATM Over SDH、IP Over ATM、IP Over SDH、IP Over WDM。提出 比 较适合于高速公路收费系统联网的技术方案，并设计了网络通信管理和维护的具体内容 。