Green tea may protect brain cells against Parkinson'S

Does the consumption of green tea,widely touted to have beneficial effects on health,also protect brain cells? As reported in the 15 December, 2007 issue of Biological Psychiatry, studies by CAS researchers indicate this may be the case. A research team led by Prof.ZHAO Baolu from the State Key Laboratory of Brain & Cognitive Science affiliated to the CAS Institute of Biophysics investigated the effects of green tea polyphenols,a group of naturally     

为什么硅谷能够持续产生颠覆性创新?——基于企业创新生态系统视角的分析

硅谷被公认为是创新和增长的代名词,也是全球重要的颠覆性创新中心之一,苹果、英特尔、谷歌等硅谷企业更是行业翘楚。如何解释硅谷能够持续性产生颠覆性创新这一现象？结合现实需求和研究缺口,试图运用案例研究方法来破解硅谷企业通过创新生态系统持续实现颠覆性创新的密码。首先回顾了硅谷的起源,并描绘了硅谷由企业牵引的创新演进轨迹。其次,归纳了近20年来硅谷企业的代表性颠覆性创新的基本特征,并提炼了影响这些颠覆性创新的共性要素。研究结果表明：（1）构建新颖且强大的企业创新生态系统,是推动硅谷企业从“后发者”到“颠覆者”的关键路径;（2）嵌入平台化思维和模块化逻辑,是提升硅谷企业创新生态系统独特性的重要机制。文章最后给出了研究结论并凝练了若干管理启示,可为当前积极探索颠覆性创新的我国企业提供参考。     

后疫情时代概率论与数理统计课程教学改革与实践研究

概率论与数理统计课程是我国高校理工科和经管类专业学生的基础课和必修课,以往教学方法下,学生会出现概念难以理解、方法难以掌握等问题,而疫情防控初期的大规模纯线上教学中又出现了网络(系统)卡顿、教师不适应线上教学、学生上网课时注意力不集中、教学评价模式单一、学生听课状态无法保障及教学效果不理想等问题.针对概率论与数理统计课...     

The measurement of proprioceptive accuracy: A systematic literature review

Background:Proprioceptive accuracy refers to the individual’ s ability to perceive proprioceptive information,that is,the information referring to the actual state of the locomotor system,which originates from mechanoreceptors located in various parts of the locomotor system and from tactile receptors located in the skin.Proprioceptive accuracy appears to be an important aspect in the evaluation of sensorimotor functioning;however,no widely accepted standard assessment exists.In this systematic ...     

Exercised blood plasma promotes hippocampal neurogenesis in the Alzheimer's disease rat brain

Background:Exercise training promotes brain plasticity and is associated with protection against cognitive impairment and Alzheimer’s disease(AD).These beneficial effects may be partly mediated by blood-borne factors.Here we used an in vitro model of AD to investigate effects of blood plasma from exercise-trained donors on neuronal viability,and an in vivo rat model of AD to test whether such plasma impacts cognitive function,amyloid pathology,and neurogenesis.Methods:Mouse hippocampal neuronal ...     

应用尝试教学方法培养学生四个意识

近几年来,我应用尝试教学方法从事自然实验课的教学,从多方面给学生创造独立思考、主动研究探索、分析问题解决问题的情境和条件,使学生从被动学习转为主动学习,充分发挥     

神舟飞船及其太空邮件——2007年圣彼得堡世界邮展获奖邮集

《神舟飞船及其太空邮件》是一部以中国太空邮件为主要素材、反映中国载人航天事业发展的航天类集邮展品,同时也是一部非常现代的集邮展品。在2007年圣彼得堡世界邮展上获得了银奖。     

马克@吐温嘲笑富翁

一次马克@吐温在路上与富翁不期而遇.富翁想捉弄马克@吐温一下,便对马克@吐温说:"你猜猜看,我的眼睛哪一只是假的?”     

Warming-induced phenological mismatch between trees and shrubs explains high-elevation forest expansion

Despite the importance of species interaction in modulating the range shifts of plants,little is known about the responses of coexisting life forms to a warmer climate.Here,we combine long-term monitoring of cambial phenology in sympatric trees and shrubs at two treelines of the Tibetan Plateau,with a meta-analysis of ring-width series from 344 shrubs and 575 trees paired across 11 alpine treelines in the Northern Hemisphere.Under a spring warming of +1℃,xylem resumption advances by 2-4 days in ...