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都是 “反疫苗运动” 惹的祸
都是 “反疫苗运动” 惹的祸
2019 - 04 - 12
4 月 9 日，美国纽约市市长比尔 · 德 · 布拉西奥宣布，该市布鲁克林区的威廉斯堡进入紧急状态，让当地民众一时风声鹤唳。是什么导致政府宣布这一近年罕见的公共卫生紧急情况？答案你或许想不到，肇事者居然是为我们熟知的一种疾病——麻疹。卷土重来，美多地暴发麻疹疫情麻疹传染性极强，多见于儿童。我国在 1965 年后进行针对性疫苗接种的推广，这种疾病发病率逐渐减少。在美国，本已消失的麻疹病例在近些年时有出现，今年在个别地区更是呈大暴发之势。美国疾病控制中心（CDC）数据显示，截至 4 月 4 日，美国 19 个州统计共出现 465 个麻疹病例，成为 2000 年以来疫情第二严重年份（2014 年全美病例达 667 例）。而纽约的布鲁克林则成为重灾区，仅威廉斯堡这一社区从去年 10 月至今年 4 月 8 日就有 228 例确诊病例。除纽约市外，纽约州、新泽西州、华盛顿州、密歇根州以及加州等多个地区出现了 3 例以上的麻疹病例。而 CDC 将一地区出现 3 例以上麻疹病例定义为疫情暴发。一时间，麻疹疫情成为美国公共卫生领域最受关注的话题。推波助澜，“反疫苗运动” 难辞其咎CDC 认为，美国的麻疹疫情与从以色列、乌克兰和菲律宾等国来美旅客有关，这些国家正在暴发大规模麻疹疫情。而对于纽约市布鲁克林区来说，麻疹疫情的暴发则要归咎于人们的错误认知。一场愈演愈烈的 “反疫苗运动”，...
8
哪些身体器官在高温下最危险?
哪些身体器官在高温下最危险?
2019 - 08 - 23
2019年8月23日讯 /生物谷BIOON /——2019年6月，欧洲大部分地区遭遇了早期热浪，法国的气温达到了创纪录的46摄氏度(115华氏度)。热浪的特点是在几天几夜持续高温。它们对我们的日常生活有重要的影响--我们感到过热和疲劳。当热浪来袭时，许多政府会启动一项'热行动计划'，建议受影响的人多喝水，避免剧烈运动，保持凉爽。如果不这样做，就有中暑的风险，而中暑有可能危及生命。但是，人体究竟是如何应对如此极端的温度的呢？为什么高温如此危险呢？哪些器官受到影响，什么时候情况会变得更糟？图片来源：http://cn.bing.com保持凉爽人体的核心温度通常在36到38摄氏度之间波动(97到99华氏度)。在这个温度范围内，生化反应可以正常进行，这对细胞和器官的正常功能至关重要。人类的身体也能很好地应对各种可能威胁其核心温度的环境条件。当核心温度偏离正常范围时，身体就会启动生理反应，使温度恢复正常。这种温度调节反应相当于你家的恒温器；一旦内部温度偏离理想温度，加热或冷却系统就会被激活，回到理想温度。在人体中，这个恒温器位于我们大脑的底部，一个叫做下丘脑的区域。位于我们皮肤、肌肉和其他器官的温度传感器提供的信息被分析，必要时，启动生理反应。对温度升高的第一个也是最重要的反应是通过我们身体的皮肤和四肢，如手和脚散热。我们开始产生汗液，汗液会在皮肤上蒸发，在这个过程中散热。这...
9
青蛙肺部能充当“降噪耳机”
青蛙肺部能充当“降噪耳机”
2021 - 06 - 01
为了成功交配，许多雄蛙会坐在一起，向潜在配偶发出叫声。这时，问题就出现了——每个试图在人声鼎沸的鸡尾酒会上听清别人说话的人都会遇到：一只雌蛙是如何在背景噪音（包括其他蛙类的声音）中听到并找到自己的如意郎君呢？现在，研究人员可能找到了答案。3月5日，一篇发表在Cell Press细胞出版社旗下期刊Current Biology（《当代生物学》）上的报告显示，青蛙能做到这一点要归功于它们的肺部。当肺部膨胀时，青蛙鼓膜在特定的频率范围内降低了对环境噪音的敏感性，从而更容易关注配偶的叫声。 “从本质上讲，肺消除了鼓膜对噪音的反应，特别是对一些不在调上的‘繁殖大合唱’中所遇到的噪音。”论文主要作者、明尼苏达大学圣奥拉夫学院的Norman Lee说。 研究人员解释说，青蛙肺部所做的事情被称为“声谱对比度增强”。这是因为，与相邻频率的噪声相比，它使雄性声谱的频率尤为突出。 “这类似于某些助听器和耳蜗植入物中用于增强声谱对比度的信号处理算法。”明尼苏达大学双城校区的资深作者Mark Bee说，“人类设计这种算法，用来放大或提升语音的频率，减弱或过滤语音之间的频率，或两者兼而有之。青蛙的肺部似乎会减弱雄性交配叫声之间的频率。我们认为，这种现象发生的物理机制与降噪耳机的工作原理类似。” 科学家们早就知道，声音信号是大多数青蛙繁殖的关键。事实上，青蛙拥有一种独特的...
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EVOS™ Vessel Holder, universal
产品名称： EVOS™ Vessel Holder, universal
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 has a 25.4 mm opening and accommodates most vessel types. 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 samp...
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EVOS™ Vessel Holder, Greiner T-75 flask
产品名称： EVOS™ Vessel Holder, Greiner T-75 flask
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 Greiner T-75 flask. 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...
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EVOS™ Vessel Holder, Hemocytometer
产品名称： EVOS™ Vessel Holder, Hemocytometer
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 a hemocytometer. 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 hol...
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EVOS™ Vessel Holder, Nunc™ T-75 flask
产品名称： EVOS™ Vessel Holder, Nunc™ T-75 flask
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 Nunc® T-75 flask. 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 ...
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EVOS™ Vessel Holder, two 25-cm T-flasks
产品名称： EVOS™ Vessel Holder, two 25-cm T-flasks
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 ...
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EVOS™ Vessel Holder, one 100-mm Petri dish
产品名称： EVOS™ Vessel Holder, one 100-mm Petri dish
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...
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EVOS™ Vessel Holder, two 60-mm Petri dishes
产品名称： EVOS™ Vessel Holder, two 60-mm Petri dishes
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...
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EVOS™ Vessel Holder, four 35-mm Petri dishes
产品名称： EVOS™ Vessel Holder, four 35-mm Petri dishes
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...
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EVOS™ Vessel Holder, two 25 x 75 mm slides
产品名称： EVOS™ Vessel Holder, two 25 x 75 mm slides
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...
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EVOS™ 4X Objective, fluorite, LWD, phase-contrast
产品名称： EVOS™ 4X Objective, fluorite, LWD, phase-contrast
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...
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EVOS™ Light Cube, Cy™5
产品名称： EVOS™ Light Cube, Cy™5
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&...
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EVOS™ Light Cube, RFP
产品名称： EVOS™ Light Cube, RFP
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® ...
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