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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...
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肌肉干细胞研究最新进展（第4期）
肌肉干细胞研究最新进展（第4期）
2021 - 04 - 01
2021年3月29日讯/生物谷BIOON/---肌肉干细胞可发育分化为成肌细胞(myoblasts)，后者可互相融合成为多核的肌纤维，形成骨骼肌最基本的结构。人类胚胎和成人体内都存在肌肉干细胞。胚胎和胎儿的肌肉干细胞增殖使得肌肉组织发展；成年人体内的肌肉干细胞亦被称为卫星细胞，处于休眠状态，沿着肌肉纤维而分布。在经过强烈运动或是受到外界伤害之后，成人的肌肉干细胞会被激活并开始自我增殖，从而增加或是恢复成人的肌肉组织。对于老年人，肌肉干细胞不再具有自我复制的活性，从而表现为肌肉组织的萎缩。小编针对近年来肌肉干细胞研究取得的进展进行一番盘点，以飨读者。1.Nature子刊：揭示一种化学物混合物可产生大量的肌肉干细胞doi:10.1038/s41551-021-00696-y在一项新的研究中，来自美国加州大学洛杉矶分校的研究人员鉴定出一种化学物混合物，它能够大量地产生可以自我更新并可产生所有类型骨骼肌细胞的肌肉干细胞。这一进展可能导致开发基于干细胞的疗法，以治疗因受伤、年龄或疾病而导致的肌肉损失或损伤。相关研究结果近期发表在Nature Biomedical Engineering期刊上，论文标题为“Skeletal muscle regeneration via the chemical induction and expansion of myogenic stem cells in...
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两篇Cell重磅！三种基因告诉你人脑何以为人脑
两篇Cell重磅！三种基因告诉你人脑何以为人脑
2018 - 06 - 29
Cell杂志发文称，科学家已发现3个几乎相同的基因可以帮助解释人类早期祖先的0.5升灰质是如何成为1.4升器官的，这一进化使得人类这一物种是如此成功和独特。另外，新发现的基因帮助解释了大脑发育有时是如何出错并导致神经系统紊乱的。DOI: https://doi.org/10.1016/j.cell.2018.03.051这一新发现的明星家族——NOTCH2NL，在大脑皮质发育过程中表达，负责促进神经祖细胞更新，从而产生更多的神经元。NOTCH2NL本身是NOTCH基因家族的一个分支，后者负责调控所有生物（从过引导鲸鱼）的发育时间。但是，5月31日发表在Cell上的两项研究显示，在最近的进化史中，发生了一系列“基因事故”，在人类身上产生了4个非常密切相关的NOTCH2NL基因。“这些基因是一个古老的发育基因的后代，在进化过程中不断复制和改变，从而加入与人脑扩大有关的DNA名单中。”耶鲁大学进化基因组学家James Noonan说，“它们会增加脑组织中潜在神经细胞的数量这些新蛋白质可能会以非常强大的方式改变脑部发育中的重要途径。”论文一：人类独有的NOTCH2NL在猿的祖先中，NOTCH2的复制产生了一个非功能性的NOTCH2NL (gray)。修复和后来的基因复制产生了多个拷贝。(GRAPHIC) V. ALTOUNIAN/SCIENCE; (DATA) FIDDES ET AL.,...
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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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