二维细胞运动模型的数值模拟

研究了一个二维细胞运动模型，该模型是个动边界问题．我们运用运动网格的有限元算法对此模型进行了数值模拟，数值结果表明，细胞最终收敛到固定形状，并且以固定速度向前运动．     

晚更新世东北亚现代人迁移与交流范围的初步研究

民族考古学曾运用相似性概念对许多地区狩猎采集者的行为进行了研究,相关的民族考古学资料为研究旧石器时代晚期现代人的迁移性提供了可能。随着东北亚地区出土黑曜岩遗物遗址的增加,相应的黑曜岩产地分析研究也日益增多,目前有关长白山黑曜岩产地研究的资料已显著累积。本文参考了现今狩猎采集者的民族学资料,以产自长白山的黑曜岩遗物及分布于特定区域的有柄尖刃器为研究对象,发现晚更新世时期(MIS 2)东北亚现代人拥有广大的直接或间接活动范围。对现代人迁移性的研究不仅为区域石器制作技术的对比分析提供了便利,也为了解古人类的生存环境及适应策略提供了重要资料。     

Protandrous migration and variation in morphological characters in Emberiza buntings at an East Asian stopover site

The effect of the timing of spring migration on reproductive success differs between the sexes. As a consequence, various sex‐specific tactics relating to the timing of migration have evolved in migratory avian groups. Various hypotheses have been proposed to explain differential migration to breeding or wintering grounds, and inter‐ and intrasexual size differences are often considered one of the proximate mechanisms. We investigated arrival patterns in the spring by individuals of each sex, sexual size dimorphism and related morphological variables, and the relationship between size variation and arrival date in five bunting species that passed through an East Asian migratory flyway stopover site in 2006–08. Males of all the study species arrived before females, and significant sexual dimorphism was observed. Several morphological characters, including total length, wing‐length and tail‐length, contributed to the size variation. Although larger males arrived earlier, there was no relationship between arrival date and size in females. Our study confirmed that East Asian buntings display a discriminated protandrous migration pattern at the stopover site as well as at the breeding grounds. This is consistent with the view that larger body size in males is favoured due to its association with early arrival to help ensure access to the best resources and hence enhanced mating success.     

Effects of Brain-Derived Neurotrophic Factor on Neurite Growth of Deutocerebral Neurons in Brain of the Silk Moth Bombyx mori

This study was conducted to investigate effects of brain‐derived neurotrophic factor (BDNF) on the neurite growth of deutocerebral neurons in vitro, and production of BDNF‐like neuropeptide from brain of the silk moth, Bombyx mori. In primary culture of antennal lobe (AL) neurons with BDNF, it promoted a significant neurite extension of putative AL projection neurons and an outgrowth of branches from principal neurites of putative AL interneurons. Results from immunolabeling of brain and retrocerebral complex showed that BDNF ‐like neuropeptide labeled in brain was synthesized by median and lateral neurosecretory cells, then transported to corpora allata for storage.