Taxonomical notes on selected freshwater fish species described from northern and central Vietnam （Cypriniformes： Balitoridae, Cobitidae, Cyprinidae, Nemacheilidae; Perciformes： Channidae, Osphronemidae; Synbranchiformes： Mastacembelidae）

Selected,little known taxa of northern and central Vietnamese freshwater fish species are reviewed.Nomenclatural acts are taken:Hemibarbus lehoai is placed in synonymy of H.maculatus,Paracobitis hagiangensis in synonymy of Schistura caudofurca.A neotype of Micronemacheilus bacmeensis is assigned.The name Channa hanamensis is treated as a nomen nudum.Two labeonine species described from China are nomenclaturally affected:Garra findolabium is transferred to Vinagarra and its specific epithet is treated as a noun in apposition;the specific epithet of Sinigarra napoense is corrected to napoensis.

论马克思的“自然辩证法”思想实验

马克思对科学技术和自然辩证法同样给予专门关注,留下了大量"科学笔记",开展了自然辩证法思想实验。在反对庸俗唯物主义和社会达尔文主义的斗争中,马克思与恩格斯讨论过自然辩证法研究计划。马克思考察了最新科学发现,廓清了马克思主义的科学基础。进而,他在"生态学笔记"中提出了生态自然观的设想,在《数学手稿》中提出了科学数学化的设想,在"工艺学笔记"中提出了技术社会学的设想。马克思同样是自然辩证法的构思者和创始人。