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2021 - 11 - 06
来自美国和日本的科学家们通过研究发现,由于进行了有规律的有氧运动,相比年轻成年人而言,中年的耐力运动员还会显示出相当水平的上述因素。本文研究结果提供了强有力的迹象表明,血压的控制和血管弹性程度的改善或有助于更好地改善中年人群大脑血流的调节。2021年12月19日 讯 /生物谷BIOON/ --中年有氧运动或能显著影响年龄相关的大脑和心血管调节的变化,中年耐力运动员要比相同年龄组的久坐成年人有着更好的血压控制和更高的动脉弹性(一种心血管疾病风险的无创测量)。近日,一篇发表在国际杂志Journal of applied Physiology上题为“Midlife aerobic exercise and dynamic cerebral autoregulation: associations with baroreflex sensitivity and central arterial stiffness”的研究报告中,来自美国和日本的科学家们通过研究发现,由于进行了有规律的有氧运动,相比年轻成年人而言,中年的耐力运动员还会显示出相当水平的上述因素。本文研究结果提供了强有力的迹象表明,血压的控制和血管弹性程度的改善或有助于更好地改善中年人群大脑血流的调节。图片来源:Pixabay/CC0 Public Domain中年机体动脉的僵硬程度与晚年中风和痴呆症风险增加有关,同时还会增加机...
2
2019 - 08 - 30
最近,《自然》杂志报道了不少关于癌症的研究。上周,学术经纬团队分享了一则癌症研究的重要突破——通过荧光标记,科学家们能够看清癌细胞如何“腐蚀”周边的健康细胞,发生转移。今天,我们又读到了一篇关于癌症转移的最新论文,它深刻揭示了癌症转移的复杂性,并提醒我们,在攻克癌症的道路上,我们还有很长的路要走……先来聊聊癌症。我们知道,癌症的发展就好像是一个熊孩子长大一样,会分成不同的阶段。在早期,癌细胞会疯狂生长,侵入和传播(invasion and dissemination)到组织内,在身体里形成肿瘤。到了晚期,癌细胞则会发生转移(metastasis),跑到身体的其他器官里落地生根,形成新的病灶。现在的医学知识告诉我们,一旦癌症发生了转移,患者的生命就岌岌可危。可是,癌细胞在一个地方长得好好的,它为啥会发生转移呢?过去的很多科学家相信,这与一种叫做E-cadherin(E-钙粘蛋白)的蛋白质有关。从功能上看,它负责把不同的细胞“粘”在一起。如果癌细胞能够减少这种钙粘蛋白的表达,就会变得更有“活动性”,也更容易发生转移。不过,科学家们也观察到了一些例外——在一种叫做“乳腺导管癌”的癌症中,发生转移的癌细胞,里头的E-钙粘蛋白含量可不少。这是为啥呢?有科学家解释说,这是因为癌细胞慢慢地又把自己“粘”回到了一起。这听起来是个合理的解释,但没有让所有人感到信服。为了寻找其他原因,来自美国知名的约...
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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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型号:
时间: 2019 - 04 - 15
描述This achromat objective is ideal for general applications. This is a coverslip-corrected objective that is optimized for imaging through #1.5 coverslips. 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 magnifications and optical specifications.Additional characteristics of this EVOS® objective:• Magnification: 50X• Numerical Aperture: 0.95• Working Distance:...
型号:
时间: 2019 - 04 - 15
描述The EVOS M7000 Imaging System is a high-performance, fully automated, inverted, multi-channel fluorescence and transmitted light imaging system. It was developed to meet today’s expectations for image quality, user interface interactions, data generation speed and flexibility, and end-user value. The powerful and time-saving acquisition tools with enhanced autofocus algorithms and automated routines for microwell plate assays, time-lapse live cell imaging, area scanning in time lapse and Z-sta...
型号:
时间: 2019 - 04 - 15
描述The EVOS® FL Imaging System is a fully integrated, digital, inverted imaging system for four-color fluorescence and transmitted-light applications. It is powerful, yet easy-to-use and delivers high-definition images with exceptional convenience. The unique light cubes, sensitive camera, and precision-engineered optical system make the EVOS® FL system ideal for both demanding and routine fluorescence imaging applications.The EVOS® FL Imaging System offers you these important ad...
型号:
时间: 2019 - 04 - 15
描述The EVOS® Onstage Master Plate is part of the EVOS® Onstage Incubator and holds the EVOS® Onstage Vessel Holder. The EVOS® Onstage Incubator is an environmental chamber designed specifically for use with the EVOS® FL Auto Imaging System. This master plate plus vessel holder design, with vessel holders available that accommodate various types of cell culture vessels, provides flexibility in your approach to extended time-lapse imaging experiments under precisely co...
型号:
时间: 2019 - 04 - 15
描述EVOS® Onstage vessel holders maximize your choice of cell culture vessels when conducting time-lapse imaging experiments using the EVOS® FL Auto Imaging System equipped with an EVOS® Onstage Incubator. EVOS® Onstage vessel holders allow a perfect fit of your micro-well plates or cell culture flasks/dishes to the master plate of the EVOS® Onstage Incubator for increased precision in sample alignment. This particular vessel holder accommodates two 25-mL T-flasks. With ...
型号:
时间: 2019 - 04 - 15
描述EVOS® Onstage vessel holders maximize your choice of cell culture vessels when conducting time-lapse imaging experiments using the EVOS® FL Auto Imaging System equipped with an EVOS® Onstage Incubator. EVOS® Onstage vessel holders allow a perfect fit of your micro-well plates or cell culture flasks/dishes to the master plate of the EVOS® Onstage Incubator for increased precision in sample alignment. This particular vessel holder accommodates multi-well plates (dimensi...
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 securely holds two 25 x 75 mm standard or chamber microscope slides and is specific for the automated stage of the EVOS® FL Auto Imaging System. It is just one of many easy-to-change vessel holders and stage plates available for this instrument plat...
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/BD T-25 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 ...
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...
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...
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...
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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