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4
2019 - 07 - 19
近日,来自 9 个国家的 33 名微生物学家在《自然综述:微生物学》上发文表示,应该进一步将微生物融入主流气候变化研究和气候变化框架中,以应对人为造成的气候变化问题。他们警告说,“提醒人类注意,气候变化的影响将严重依赖微生物的反应,它们对于实现一个环境可持续发展的未来至关重要”。已知人类活动及其对气候和环境的影响关系到动植物灭绝和生物多样性损失,并且危及地球上的动植物生命。微生物也会对温室气体排放产生重要影响。尽管微生物丰富多样,但它们维护生态系统健康的作用,以及如何影响气候变化或被气候变化影响,却鲜为人知。澳大利亚新南威尔士大学的 Ricardo Cavicchioli 等人认为,微生物在气候变化生物学中扮演的核心角色及其全局重要性不应被低估,他们并且呼吁研究人员、机构和政府对微生物加剧或缓解人为气候变化影响的作用进行评估。研究人员在文中探讨了气候变化对微生物作用以及全球海陆生物群落的影响。他们还指出,从农业和传染病的角度出发,需要更深入地理解气候变化对微生物的影响,比如气候变化预计将提高部分人类病原体的抗生素耐药性。相关论文信息:https://doi.org/10.1038/s41579-019-0222-5
5
2019 - 07 - 05
据新华社电 美国疾病控制和预防中心研究团队发现,正在刚果(金)使用的两种试验性疗法对抗击当前的埃博拉疫情有效。7 月 9 日发表在英国《柳叶刀—传染病》杂志上的研究显示,在实验室中,抗病毒药物 Remdesivir,以及由三种抗体组成的抗埃博拉药物 ZMapp 可阻断新一轮埃博拉疫情的致病毒株在人类细胞中增长。确认抗病毒药物有效的关键之一在于找到此次疫情的致病毒株。论文第一作者、美疾控中心微生物学家劳拉 · 麦克马伦说,目前在刚果(金)试用的疗法均针对以前疫情中获取的埃博拉毒株,而埃博拉是一种核糖核酸(RNA)病毒,会不断变异,因此确定现有疗法是否对新毒株奏效至关重要。美疾控中心研究人员没有当前在刚果(金)传播的 “伊图里” 毒株样本,但他们从开源基因库中获得病毒序列数据,使用 “反向遗传学” 技术重组了毒株。这项技术有助于研究人员更多了解新毒株在埃博拉家族树中的位置,从而寻找更多潜在疗法,并测试各类新疗法的有效性,还可与未来的新毒株进行比对。研究中还发现,2014 年到 2016 年西非多国爆发埃博拉疫情期间开发的一种实验室病毒诊断方法可用于诊断 “伊图里” 毒株。(周舟)文章摘自:生物360
6
2019 - 07 - 12
大脑每天接收的来自客观世界的感觉信息纷繁复杂,大脑对这些刺激进行分类后,人们才有感知判断。那么大脑是如何开展这项工作的呢?中科院脑科学与智能技术卓越创新中心(中科院神经科学研究所)研究员徐宁龙团队揭示了其中的奥秘,解析了大脑对感觉信息进行范畴化的皮层神经元群体运算机制。相关成果日前在线发表于《神经元》。大脑每天接收海量的来自客观世界的感觉信息,能够形成的概念和采取的行动却数目有限,为形成有意义的认知来指导行为,大脑需要对这些信息进行高效的组织管理,其中最基本的过程就是范畴化——简言之,就是分类。神经科学家本世纪初开启了信息分类和感知觉范畴化神经机制研究的新领域,但以往研究侧重神经运算的结果,对于感觉信息怎样被转化为离散的类别信息这一神经运算过程,并没有明确答案。本研究中,研究人员在小鼠中建立了一个基于听觉的分类抉择行为范式,结合活体双光子成像技术,解析了对感觉信息进行范畴化的皮层神经元群体运算机制。徐宁龙介绍,听到声音,经过训练的小鼠大脑中的一类神经元表现出对声音类别的特异性反应,将不同频率的纯音归类到 “高音” 或“低音”范畴。在高低音临界点的分类中,小鼠会“纠结”。这时大脑中的另一类神经元,表现出对类别边界频率声音的“选择性反应”,协助小鼠进行判断和分类。如果小鼠没有被要求完成分类任务,这类神经元选择性反应则“难觅踪迹”。研究表明,在听觉皮层中存在范畴抉择相关的单细胞反应,听觉...
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型号:
时间: 2019 - 04 - 15
描述EVOS® vessel holders allow a perfect fit of your microscope slide, cell culture flask or dish, or micro-well plate to the stage of the EVOS® imaging systems for increased precision in sample alignment. This particular vessel holder accommodates two 25 cm T-flasks. It is just one of many easy-to-change vessel holders and stage plates available for this instrument platform. With a snug and secure fit, yet readily switched, these accessories make imaging samples in a range of vessel ...
型号:
时间: 2019 - 04 - 15
描述EVOS® vessel holders allow a perfect fit of your microscope slide, cell culture flask or dish, or micro-well plate to the stage of the EVOS® imaging systems for increased precision in sample alignment. This particular vessel holder accommodates one 100 mm Petri dish. It is just one of many easy-to-change vessel holders and stage plates available for this instrument platform. With a snug and secure fit, yet readily switched, these accessories make imaging samples in a range of vess...
型号:
时间: 2019 - 04 - 15
描述EVOS® vessel holders allow a perfect fit of your microscope slide, cell culture flask or dish, or micro-well plate to the stage of the EVOS® imaging systems for increased precision in sample alignment. This particular vessel holder accommodates two 60 mm Petri dishes. It is just one of many easy-to-change vessel holders and stage plates available for this instrument platform. With a snug and secure fit, yet readily switched, these accessories make imaging samples in a range of ves...
型号:
时间: 2019 - 04 - 12
描述EVOS® vessel holders allow a perfect fit of your microscope slide, cell culture flask or dish, or micro-well plate to the stage of the EVOS® imaging systems for increased precision in sample alignment. This particular vessel holder accommodates four 35 mm Petri dishes. It is just one of many easy-to-change vessel holders and stage plates available for this instrument platform. With a snug and secure fit, yet readily switched, these accessories make imaging samples in a range of ve...
型号:
时间: 2019 - 04 - 12
描述EVOS® vessel holders allow a perfect fit of your microscope slide, cell culture flask or dish, or micro-well plate to the stage of the EVOS® imaging systems for increased precision in sample alignment. This particular vessel holder accommodates two 25 x 75 mm slides. It is just one of many easy-to-change vessel holders and stage plates available for this instrument platform. With a snug and secure fit, yet readily switched, these accessories make imaging samples in a range of vess...
型号:
时间: 2019 - 04 - 12
描述This fluorite objective is ideal for fluorescence and demanding transmitted-light applications. This is a long working distance (LWD) objective that is optimized for the imaging of slides, cell culture dishes and flasks, and microtiter plates. This is also a phase-contrast objective, making it useful for hard-to-see, translucent speciments. All EVOS® objectives offer outstanding optical performance from visible light to near infrared light. The extensive choice of objectives satisfies nee...
型号:
时间: 2019 - 04 - 12
描述All EVOS® fluorescence imaging systems and the Countess® II FL Automated Cell Counter contain our unique, proprietary LED light cubes. This world-leading light engine outputs remarkable intensity over a short light path that delivers superior fluorophore excitation. Each cube contains an LED, condensing optics, and hard-coated filters. EVOS® light cubes are user-changeable and automatically recognized by the system. The Cy®5 light cube is ideal for use with Alexa Fluor&...
型号:
时间: 2019 - 04 - 12
描述All EVOS® fluorescence imaging systems and the Countess® II FL Automated Cell Counter contain our unique, proprietary LED light cubes. This world-leading light engine outputs remarkable intensity over a short light path that delivers superior fluorophore excitation. Each cube contains an LED, condensing optics, and hard-coated filters. EVOS® light cubes are user-changeable and automatically recognized by the system. The RFP light cube is ideal for use with Alexa Fluor® ...
型号:
时间: 2019 - 04 - 12
描述All EVOS® fluorescence imaging systems and the Countess® II FL Automated Cell Counter contain our unique, proprietary LED light cubes. This world-leading light engine outputs remarkable intensity over a short light path that delivers superior fluorophore excitation. Each cube contains an LED, condensing optics, and hard-coated filters. EVOS® light cubes are user-changeable and automatically recognized by the system. The GFP light cube is ideal for use with Alexa Fluor® ...
型号:
时间: 2019 - 04 - 12
描述All EVOS® fluorescence imaging systems and the Countess® II FL Automated Cell Counter contain our unique, proprietary LED light cubes. This world-leading light engine outputs remarkable intensity over a short light path that delivers superior fluorophore excitation. Each cube contains an LED, condensing optics, and hard-coated filters. EVOS® light cubes are user-changeable and automatically recognized by the system. The DAPI light cube is ideal for use with Acridine, Alexa F...
型号:
时间: 2019 - 04 - 12
描述This power cord is for use with EVOS® XL, FL , FL Color, and FL Auto systems in countries with Type I power plugs. The Type I electrical plug is mainly used in Australia and New Zealand, but is also used in China and parts of Asia, South America, and Africa.
型号:
时间: 2019 - 04 - 11
描述This achromat objective is ideal for general applications. This is a long working distance (LWD) objective that is optimized for the imaging of slides, cell culture dishes and flasks, and microtiter plates. This is also a phase-contrast objective, making it useful for hard-to-see, translucent speciments. All EVOS® objectives offer outstanding optical performance from visible light to near infrared light. The extensive choice of objectives satisfies needs across the spectrum of magnificati...
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