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Scepter™ 3.0 Cell Counter – How it Works

Scepter™ counting is 7 to 10 times faster than hemocytometry-and also faster than other automated counters. Learn more about how this amazing technology works

Enzymatic Assay of Cathepsin B

Cathepsin B is a lysosomal cysteine proteinase with broad specificity. This protocol uses Nα–CBZ–Arg–Arg–7–amido–4–methylcoumarin as the substrate for fluorometric detection of Cathepsin B activity.

In Vitro Differentiation of Human PBMC and CD34+ Derived Monocytes into Mature CD83+/CD14- Dendritic Cells

Generate mature human dendritic immune cells from PBMCs or CD34+ stem cell derived monocytes in 7 days in defined and serum-free dendritic cell culture media. Explore over 350 PromoCell products.

3D Mammosphere Culture Media

3D mammosphere culture protocol used to expand human MCF-7 and MDA-MB-231 breast cancer cells in serum-free/xeno-free stem cell culture media. Explore over 350 PromoCell products on Sigma.com.

基因组DNA样品纯化和质量评估

简单的DNA和RNA纯法方法大幅推动了基因组和基因表达的分析和鉴定。人们需要快速、方便地从多种细胞来源分离DNA和RNA，包括哺乳动物、植物和细菌培养物来源的细胞和组织。

裂解酶

裂解酶提供了一种非机械式细胞裂解和原生质体准备方法。这看上去是个非常简单的过程：只需加入酶，将试管放入水浴然即可。但这过程中到底发生了什么？

植物CRISPR/Cas9基因组编辑

锌指核酸酶（ZFN）是由Sigma-Aldrich在不到8年前推出的，但是从那时起靶向基因组编辑技术已迅速发展。最近，CRISPR/Cas9 通路的发现加快了对该领域的兴趣，为研发开辟了新的可能性。

逆转录

分析基因表达的方法之一是测量基因的mRNA浓度。此类分析面临着若干挑战，例如不同转录本之间的半衰期不同、转录时间模式以及mRNA和蛋白质之间缺乏相关性。

定量PCR基础知识

实时聚合酶链式反应可用于计算样本的起始材料量。它相比常规PCR具有更大的检测动态范围。

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