Involvement of secondary motor areas in externally-triggered single-finger movements of dominant and non-dominant hands

Abstract Whether the secondary motor areas are involved in simple voluntary movements remains controversial. Differences in the neural substrates of movements with the dominant and the non-dominant hands have not been well documented. In the present study, functional magnetic resonance imaging (fMRI) was used to investigate the hemodynamic response in the primary motor cortex (M1), supple-mentary motor area (SMA) and premotor cortex (PMC) in six healthy right-handed subjects while performing a visually-guided finger-tapping task with their dominant or non-dominant hands. Significant activation was observed in M1, SMA and PMC during this externally triggered simple voluntary movement task. While dominant hand movements only activated contralateral motor areas, non-domi-nant hand movements also activated ipsilateral SMA and PMC. The results provide strong evidence for the involvement of the secondary motor areas in simple voluntarymovements, and also suggest that movements of the dominant hand primarily engage the contralateral secondary motor areas, whereas movements of the non-dominant hand engage bilateral secondary motor areas.     

竹芋和三色竹芋的试管繁殖研究

本研究对竹芋和三色竹芋作了试管繁殖试验，以两种植物的不同器官作为外植体，以ＭＳ作基本培养基，附加不同的植生长调节物６－苄基腺嘌呤和萘乙酸诱导再生植株。     

关于磷光体NaMVO4：Eu^3＋的光谱性质研究

该文研究了Ｅｕ＾３＋在基质ＮａＭＶＯ４中的掺杂方式，测定了Ｅｕ＾３＋在此基质中的光谱性质，并研究了基质的ｓｔｏｋｅｓ位移、Ｅｕ＾３＋的电荷迁移带和电荷补偿剂Ｌｉ＾＋对Ｅｕ＾３＋发光性质的影响。结果表明，Ｅｕ＾３＋在此基质中占据偏离反演中心格位，以２个Ｅｕ＾３＋中的两个格位，余下的一个Ｍ＾２＋格位由一个空位取代，而且随Ｃａ，Ｓｒ，Ｂａ的变化，Ｅｕ＾３＋的电荷移带发生红移。     

太行山猕猴动脉血压的研究

本文报道了62例太行山猕猴的动脉血压测定结果。分别比较了麻醉状态下与非麻醉状态下的动脉血压值,发现前者低于后者;而在麻醉状态下,雌雄猕猴之间的动脉血压差异显著;并随着猕猴年龄的增长,血压逐渐升高。     

关于超立方体与Mbius立方体的连接

新型并行计算系统的研制依赖于对新型互连网络结构及其性质的研究.超立方体及其变型——Mbius立方体两者都具有优点,也具有缺点.本文给出了在超立方体与Mbius立方体的顶点之间的一种连接,从而得到一种称为HMm-立方体的新型网络,证明了HMn-立方体不仅保持了超立方体和Mbius立方体的低顶点度数和高连通度以及其直径至多比Mbius立方体大2的性质,而且它克服了超立方体对圈模拟能力的不足.     

辛酸沉淀-凝胶过滤法提取猪血清IgM

使用辛酸沉淀-凝胶过滤法提取猪血清中免疫球蛋白IgM,并通过其纯度鉴定等探讨提纯效果.通过辛酸沉淀法粗提免疫球蛋白,再结合Sephadex G200凝胶过滤法纯化获得IgM,利用SDS-PAGE电泳法和AlphaEaseFC凝胶成像分析软件测定其分子量和纯度、Bradford法测定提取蛋白浓度并计算其得率.结果显示辛酸粗提能够去除大部分杂蛋白,凝胶过滤获得两个洗脱峰,其中第一峰通过电泳鉴定含有IgM,纯度63.8%,得率1.28 mg/ml血清.利用辛酸沉淀-凝胶过滤法能够获取纯度和得率都较高的IgM,纯度可满足普通要求的实验和应用.