A neuropeptidergic circuit gates selective escape behavior of Drosophila larvae

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Methods to investigate the structure and connectivity of the nervous system

Understanding the computations that take place in neural circuits requires identifying how neurons in those circuits are connected to one another. In addition, recent research indicates that aberrant neuronal wiring may be the cause of several neurodevelopmental disorders, further emphasizing the importance of identifying the wiring diagrams of brain circuits. To address this issue, several new approaches have been recently developed. In this review, we describe several methods that are currently available to investigate the structure and connectivity of the brain, and discuss their strengths and limitations.     

Object-Displacement-Sensitive Visual Neurons Drive Freezing in Drosophila

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大数据时代的大脑科学——绘制智力的蓝图

在很多"之歌"中,我非常喜欢《长江之歌》,歌中唱道"你从远古走来,……你是无穷的源泉".正值《生物化学与生物物理进展》创刊40周年的日子,我愿意唱一首心中的歌——"脑之歌".人类大脑就好比是一条历史长河,它从远古流到了今天,又将从今天流向未来,是自然通过漫长进化所产生的最精细、最复杂、最优美和最成功的器官,是智力演化的最伟大奇迹,是人类智力产生的源泉,是人类灵性的家园.人脑以其非凡的能力造就了人类知识和文明的社会传承.可是到如今,我们还不知道人脑在整体上是如何工作的.脑功能神经组学或许是破解脑的奥秘的钥匙.     

Connectomics Analysis Reveals First-, Second-, and Third-Order Thermosensory and Hygrosensory Neurons in the Adult Drosophila Brain

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辣根过氧化物酶标记与样品后染色联用在微观脑联结组学中的应用

三维电子显微成像(volume electron microscopy)是微观尺度脑联结组学(micro-brain connectomics)研究的主要研究手段.自动卷带式连续超薄切片-收片系统(automated tape-collecting ultramicrotome,ATUM)及扫描电镜序列成像系统的联合应用,是三维电镜成像中一种重要的技术手段.该方法利用卷带式收集超薄切片,形成完整的样品切片库,进而在后续成像中形成样品三维电镜成像数据库.根据ATUM系统镜外切片-收片、保留样本切片库等特点,对相应的生物样品制备方法进行改进,包括树脂配方及树脂渗透方式改良,神经元细胞膜辣根过氧化物酶(horseradish peroxidase,HRP)稀疏化标记与样本切片库后染色联用——从而很大程度上减少样品切片的褶皱率,并使得在整体高衬度的样品图像库中高效地识别神经元身份成为可能,最终获得符合脑联结组学所需的高质量成像数据.     

A Color Vision Circuit for Non-Image-Forming Vision in the Primate Retina

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