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4
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...
5
2018 - 07 - 13
对于酸奶我们并不陌生,超市冷藏柜中形形色色的酸奶有时候常常让我们眼花缭乱,酸奶作为人们日常饮食中不可缺少的食物,其对机体健康都有什么好处呢?看看下面这些研究吧!【1】希腊酸奶vs原味酸奶vs低脂酸奶 你如何选择一种最健康的酸奶?新闻阅读:Plain, Greek, low-fat? How to choose a healthy yoghurt酸奶是世界上最古老的发酵乳制品之一,其发源可以追溯到人类文明的开始,当人类开始驯养动物生产牛奶时,对于牛奶的保质期,人类就需要想出一些解决方案了。yoghurt(酸奶)一词来自土耳其,也就是说,在酸奶的生产过程中,牛奶会发生凝结或增稠的过程。与牛奶一样,酸奶也富含钙质和蛋白质,而且其还能为机体提供其它营养成分,比如碘、维生素D、B2、B12和锌等。但酸奶的营养要高于牛奶,主要的原因是发酵的过程会让其更易于被机体所消化,因此营养物质就可以很轻松地被机体所吸收。然而酸奶也有很多类型,比如希腊酸奶和液态酸奶,以及一些添加水果和益生菌的酸奶,那么你知道哪种酸奶最健康吗?通过向鲜奶中引入一些特定的细菌就能制作酸奶了,比如嗜热链球菌、德氏乳杆菌和保加利亚乳杆菌等。通常情况下这些细菌都会在酸奶中出现并且形成酸奶发酵液,它们的协同关系是最终产品一致性的关键因素,同时这也能够带来一些健康益处,比如降低机体腹泻的严重程度和持续时间等。【2】J Nutr and ...
6
2019 - 05 - 06
来源: 中国科学报年初,一部电视剧《都挺好》火遍全国,大结局时剧中一直让人恨得牙痒痒的 “作爹” 苏大强,因患上了阿尔茨海默氏症(AD,俗称老年痴呆症)而成功“洗白”,惹出了不少人的眼泪。阿尔茨海默氏症离我们并不遥远,由它引发的故事也是常有耳闻,大多伴随着无奈与辛酸。随着全球老龄化进程的加快,愈来愈多的阿尔茨海默氏症患者将给家属及社会带来沉重的负担。根据国际阿尔茨海默氏病协会的统计数据,2018 年全世界有 5000 万老人患有痴呆,每 3 秒钟,就有 1 位患者产生;中国是阿尔茨海默氏病的重灾区,估计有 1000 万患者。关于阿尔茨海默氏症发病机制和治疗方法的研究一直都是科研界关注的重点之一。近日,中国科学院昆明动物研究所姚永刚课题组在阿尔茨海默氏症的治疗研究上取得重要进展,该研究阐明了核受体过氧化物酶体α激动剂吉非罗齐和匹立尼酸的抗阿尔茨海默氏症分子机制。相关论文在线发表于《自噬》(Autophagy)杂志上。诱导自噬,清除 Aβ作为发生在老年前期与老年期的一种常见的神经退行性脑病,阿尔茨海默氏症是最常见的老年痴呆类型,其发病率随着年龄增长而显著增加。其临床表现为病人渐进性记忆丧失、认知能力下降并伴有焦虑等其他精神相关症状。对于阿尔茨海默氏症的发病机制,现有很多学说,其中影响最广泛的有β- 淀粉样蛋白(β-amyloid,Aβ)瀑布理论,认为 Aβ的生成与清除失衡是导致神经元变...
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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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