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7
2019 - 06 - 24
2019年6月24日讯 /生物谷BIOON /——普林斯顿大学的Bonnie Bassler及其同事于近日在《PLOS Pathogens》上发表的一项研究表明,他们已经开发出一种新的突变型受体,这种受体被一种细菌病原体用来进行一种称为群体感应的化学交流过程。正如作者所指出的,突变受体可作为识别抑制群体感应的治疗化合物,以满足迫切的医疗需求。图片来源:McCready AR, et al. (2019)人类病原体绿脓杆菌利用群体感应来协调群体行为,包括生物膜的形成和促感染分子的产生。群体感应是绿脓杆菌成为病原体的关键,它依赖于细胞外信号分子的产生、释放和检测。自诱导因子与受体蛋白结合,共同激活群体感应基因的转录。在这项新研究中,Bassler和他的同事发现、纯化并鉴定了绿脓杆菌RhlR群体感应受体的突变版本,他们称之为RhlR*。值得注意的是,RhlR*不需要它的合作自动诱导器来工作。携带RhlR*的绿脓杆菌能正确形成生物膜,产生毒力因子,感染蛔虫。由于RhlR*不依赖于一种自动诱导剂来发挥作用,以前无法用RhlR进行的生化和遗传分析可以用RhlR*进行。这一发现为绿脓杆菌群体感应元件的工作机制提供了新的见解,其中最引人注目的是PqsE酶,它与RhlR一起控制毒力因子的产生。作者认为,RhlR*是了解绿脓杆菌细胞间通讯和毒性的一个特别有价值的工具,而绿脓杆菌是一种具有高度临床相关性...
8
2019 - 06 - 18
和50年前相比,现在人们日常卡路里摄入更多,平均每天高出650大卡,相当于每天多吃了一顿有汉堡、薯条和可乐的套餐,约占男性和女性每日所需食物能量的1/4和1/3。这些多余的卡路里不仅体现在越来越多人圆滚的腰围上,根据澳大利亚国立大学(Australian National University,ANU)的专家提醒,更会对我们的大脑带来“毁灭性”的影响。ANU团队的最新研究显示,由于不健康生活方式,大脑功能衰退可能比我们想象得更早。研究结果近日发表在Frontiers in Neuroendocrinology。根据世界卫生组织的数据,全球约有39%的成人超重,13%的成人肥胖。作为超重和肥胖的常见健康后果之一,2型糖尿病在2030年将影响约10%的成人。众所周知,2型糖尿病与大脑健康受损、认知功能退化有关,神经损伤也是糖尿病的并发症之一。那么,在还没有出现高血糖等符合糖尿病诊断的症状时,神经退行性病变和认知障碍是否也已经处于病理过程中了?又与哪些导致血糖变化的因素有关?研究团队回顾了近200项相关的国际研究,结果表明,即便是非糖尿病人群,由于血糖偏高和肥胖而导致的神经病变也在非常早期就开始了,并且从那时起就开始影响大脑健康和认知功能。比如,一项涉及澳大利亚超过7000人的PATH研究显示,哪怕血糖值尚且在正常范围内,但血糖偏高的人群,大脑中海马和杏仁核普遍萎缩更多,4年内体积约缩小...
9
2019 - 06 - 14
随着技术飞速发展、医学数据的持续扩增以及硬件设备的不断提升,人工智能和医疗的结合方式越来越多样化。目前AI在医疗领域中的落地的应用场景主要有医学影像、智能诊疗、智能导诊、智能语音、健康管理、病例分析、医院管理、新药研发和医疗机器人等,其中在医学影像中的应用最为广泛。一、影像医学发展现状医学影像是医生完成诊断的主要依据,通过对影像的分析和比较,从而完成有依据的诊断。但是在实际过程中,往往会存在以下问题:(1)影像学诊断人才资源紧缺。医疗机构普遍缺乏高水平的影像医师,在疾病诊断时往往会发生同病异影,异病同影等情况。(2)传统定性分析存在诊断误差。医生普遍擅长定性分析,很多微小的定量变化无法通过肉眼判断,很难做到定量分析。(3)医生阅片时间长。目前的影像呈现方式为数据和图像,而不是最有效的信息,很大程度上限制了医生的人工阅片速度。二、AI+医学影像助力疾病诊断通过引入人工智能可有效解决部分问题,目前人工智能在医学影像领域的应用方向主要以下几类:1. 影像设备的图像重建AI可以通过算法的图像映射技术,将采集的少量信号恢复出与全采样图像同样质量的图像,而且使用图像重建技术,可以由低剂量的CT和PET图像重建得到高剂量质量图像。这样在满足临床诊断需求的同时,还能够降低辐射的风险。2. 智能辅助诊断疾病(1)智能辅助诊断肺部疾病国内应用AI+CT影像最为成熟的领域在肺结节的识别上。AI能够有效识...
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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 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 ...
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® ...
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