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2020 - 04 - 30
2020年4月28日讯 /生物谷BIOON /——我们大多数人一生中至少会感染一次冠状病毒。对于许多人来说,这可能是一个令人担忧的事实,尤其是那些只听说过一种冠状病毒SARS-CoV-2的人。冠状病毒远远不止SARS-CoV-2这一种。冠状病毒实际上是数百种病毒的一个家族。其中大多数感染动物,如蝙蝠、鸡、骆驼和猫。有时,感染一个物种的病毒会发生变异,从而开始感染另一个物种。这被称为'跨物种传播'或'溢出效应'。第一种冠状病毒是在20世纪30年代的鸡身上发现的。直到20世纪60年代首次发现人类冠状病毒,人类才花了几十年的时间。迄今为止,有7种冠状病毒有能力导致人类患病。四种是地方性的(通常在特定人群或某个地区发现),通常引起轻微的疾病,但三种可能引起严重得多甚至致命的疾病。图片来源:https://cn.bing.com普通感冒冠状病毒在世界各地都有,大约有10-15%的普通感冒是由冠状病毒引起的,大部分发生在冬季。导致人类轻度至中度疾病的冠状病毒称为:229E、OC43、NL63和HKU1。首次发现能够感染人类的冠状病毒是229E和OC43。这两种病毒通常会导致普通的感冒,很少会导致严重的疾病。它们通常与其他呼吸道感染同时被发现。当在病人体内发现多种病毒或病毒和细菌时,这就称为合并感染,并可导致更严重的疾病。2004年,荷兰首次在患有细支气管炎(一种...
2
2018 - 05 - 25
基因编辑技术帮助人们实现了“编辑生命”的愿望,但该技术自身存在的局限性也限制了其广泛应用,此前人们的研究热情也多集中在编辑的效率、准确性与安全性,但常规的基因编辑技术在一个反应中仅能对一个或数个基因进行操作,且通常会在基因组中留下额外的不需要的序列修改,在大型研究中,已有的基因编辑技术远远无法满足大量不同基因的编辑需求。为解决上述问题,哈佛大学George Church教授领导的研究团队开发了一种基于CRISPR-Cas9的新型高通量基因编辑方法:guide+donor,该方法可以在单个酿酒酵母中同时精确改变数百个不同基因,编辑效率达到80%至100%,还能在生物体内选择特定行为细胞,进行定向基因编辑和修复。guide+donor除帮助构建大型文库外,还能进行基因功能分析,发现一些未知的基因突变和功能。5月21日,相关研究成果发表在著名学术期刊Nature Biotechnology上,文章题为“High-throughput creation and functional profiling of DNA sequence variant libraries using CRISPR–Cas9 in yeast”。George Church教授人类的基因变异通常是点突变导致,为在不干扰其他潜在变异的情况下重构酿酒酵母中的某些变异,CRISPR-Cas9技术借助sgRNA精确靶向D...
3
2019 - 03 - 22
给你一个冰淇淋和一块蛋糕,你先吃哪个?一块面包和一个牛油果呢?两个一块吃吗?1941 年微生物学家 Jacques Monod 给细菌提出了同样的问题。他给大肠杆菌同时提供两种食物(碳源),结果看到了两类不同的现象:对某一些食物组合(比麦芽糖和苹果酸),细菌两种同时吃,而对另一些组合(比如葡萄糖和乳糖),细菌要先吃完一种(葡萄糖),然后再会去吃另一种(乳糖)。随后 Monod 和 François Jacob 一道,找出了细菌在有葡萄糖和乳糖的情况下只吃葡萄糖的分子机制—乳糖操纵子:在这两种糖都存在的时候,细胞不会去表达运输和消化乳糖的相关基因,并获得了 1965 年的诺贝尔生理学奖。可是为什么细菌要挑食呢?为什么对于有些食物的组合它们又不挑呢?北京大学汤超教授团队发现细菌的这一套进食策略能够使它们最优化的生长。如果哪个菌种想任性一把,同时吃葡萄糖和乳糖,或者对麦芽糖和苹果酸挑食,那么它们的代价就是生长速率的降低,进而面临被淘汰的危险。结合代谢网络的拓扑特征和细胞内蛋白资源的优化分配,研究团队的理论模型定量的解释了细菌面对多种碳源的进食策略。在两类碳源同时被细菌消耗的情况下,模型预测并用实验验证了细菌内不同氨基酸上的碳原子来自两种碳源的比例。这个例子进一步说明了在看似复杂的生命现象中,存在简洁的原理与定量的规律。相关文章发表在《自然 - 通讯》杂志上。北京大学定量生物学中...
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时间: 2019 - 04 - 22
描述The LIVE/DEAD™ Fixable Green Dead Cell Stain Kit is used to determine the viability of cells prior to the fixation and permeabilization required for intracellular antibody staining or prior to elimination of biohazardous materials using formaldehyde fixation. This kit has been optimized and validated for use with a blue laser flow cytometer.• Stable—dyes are freeze dried in separate vials to maintain stability• Robust—staining pattern is the same before and after fixation• Bright signal—allows...
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时间: 2019 - 04 - 18
描述This product detects the externalization of phosphatidylserine in apoptotic cells using recombinant annexin V conjugated to green-fluorescent FITC dye and dead cells using propidium iodide (PI). Propidium iodide stains necrotic cells with red fluorescence. After treatment with both probes, apoptotic cells show green fluorescence, dead cells show red and green fluorescence, and live cells show little or no fluorescence.
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时间: 2019 - 04 - 18
描述SYTOX® Green nucleic acid stain is an excellent green-fluorescent nuclear and chromosome counterstain that is impermeant to live cells, making it a useful indicator of dead cells within a population.•  Impermeant to live cells•  Excitation/Emission: 504/523 nm•  Use with 488 Argon-ion laser•  Works with mammalian cells and both Gram-positive and Gram-negative bacteriaSimple Viability Determination SYTOX® Green allows quick determination of cell viability when usin...
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时间: 2019 - 04 - 18
描述Premo™ FUCCI Cell Cycle Sensor is a fluorescent, two-color sensor of cell cycle progression and division in live cells. It allows accurate and sensitive cell cycle analysis of individual cells or a population of cells by fluorescence microscopy, flow cytometry, or high-content imaging.At 2 x 200 µL, this is a smaller pack size version (1/5 volume) of the popular full-size product and perfect for testing its performance in your system.The Premo™ FUCCI Cell Cycle Sensor is delivered by high...
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时间: 2019 - 04 - 18
描述CountBright™ absolute counting beads are a calibrated suspension of microspheres that are brightly fluorescent across a wide range of excitation and emission wavelengths (UV to 635 nm excitation and 385-800 nm emission). CountBright™ absolute counting beads are mixed with the cell sample and assayed via flow cytometry. By comparing the ratio of bead events to cell events, absolute numbers of cells in the sample can be calculated. Because CountBright™ beads are mixed in the test sample, absolut...
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时间: 2019 - 04 - 17
描述CellTrace™ CFSE Cell Proliferation Kit is used for in vitro and in vivo labeling of cells to trace multiple generations using dye dilution by flow cytometry.• Superior performance—bright, single-peak staining enables visualization of multiple generations• Long-term signal stability—well-retained in cells for several days post stain• Non-toxic—staining does not adversely effect cell health• Simple, robust staining protocolView a selection guide for all CellTrace™ Cell Proliferation Kits fo...
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时间: 2019 - 04 - 17
描述CellTrace™ CFSE 细胞增殖试剂盒 (CellTrace™ CFSE Cell Proliferation Kit) 以方便的一次性瓶装形式提供用途广泛,稳定性高的细胞示踪剂。 羧基荧光素二醋酸盐琥珀酰亚胺酯,常称为 CFSE,可被动扩散进入细胞。 这种试剂没有颜色和荧光,直至细胞内的酯酶去除其醋酸盐基团,产生能发出明亮荧光的羧基荧光素琥珀酰亚胺酯。 琥珀酰亚胺酯与细胞内氨基反应,形成稳定且能用醛固定剂固定的荧光偶联物。 此试剂盒包含十份一次性瓶装的 CFSE,因此进行小规模实验时无需制备过量的易变质 CFSE 储存液。 此试剂盒还包括高质量的 DMSO(二甲基亚砜)和详细的实验方案。For Research Use Only. Not for use in diagnostic procedures.图表Suppressive capacity of isolated Treg cells.Suppressive capacity of isolated Treg cells. (A) CD4+ CD25–cells were stained with Ca...
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时间: 2019 - 04 - 17
描述The Click-iT® EdU Pacific Blue™ Flow Cytometry Assay Kit provides a simplified, more robust assay for analyzing DNA replication in proliferating cells as compared to traditional BrdU methods. Newly synthesized DNA is analyzed using the 405 nm laser of the flow cytometer.• Accurate—superior results compared to BrdU assays• Fast—results in as little as 90 minutes• Economical—more assays per kitView selection guide for all Click-iT™ EdU and Click-iT™ Plus EdU assays for flow c...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
型号:
时间: 2019 - 04 - 17
描述The 2018 Attune NxT Acoustic Focusing Cytometer has expanded functionalities to drive your research forward. Designed and developed to remove common barriers associated with flow cytometry, the evolutionary capabilities of the Attune NxT flow cytometer offer adaptable optical configuration options so you can get the most out of your multicolor analysis.• Free Attune NxT software with researcher-inspired upgrades• New green laser option for expanded utility and fluorochrome options• Simple push...
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