varies Protocols

Category: Cytoskeleton Protocols: Actin Myosin Protocols

The same GFP-tagged actin construct used in cell transfection experiments has been used to produce transgenic mice. Transgenic animals allow the imaging of brain tissue in the intact animal, as acutely cut slices or as organotypic slice cultures. They also serve as a source of cells for imaging neurons at high resolution in dispersed low-density cell culture. In contrast to cells transfected in culture, where the level of actin-GFP expression in neurons varies considerably, transgenic mice... - [Read Imaging Actin in Tissue Slices from Transgenic Mouse Brain Protocol]

Category: Cell Culture Protocols: Cell Immortalization Protocols

Cultivating animal cells in the laboratory is an indispensable technique for cell biologists. However, most normal primary cell lines, while faithfully reproducing the phenotype of their tissue of origin, do not grow indefinitely in culture. After a series of population doublings (the number of which varies by species, cell type, and culture conditions) primary cells enter a state where they no longer divide. - [Read Immortalization of Cells in Culture]

Category: BACs Bacterial Artificial Chromosome Protocols

BAC DNAs are prepared from 5-ml cultures of BAC-transformed cells by a modification of the standard alkaline lysis method (Preparation of Plasmid DNA by Alkaline Lysis with SDS: Minipreparation). The yield typically varies between 0.1 and 0.4 µg of BAC DNA. - [Read Isolation of BAC DNA from Small-scale Cultures Protocol]

Category: Nucleic Acid Electrophoresis Protocols: DNA Electrophoresis Protocols: DNA Electrophoresis in Polyacrylamide Gels Protocols

The "crush and soak" method, which works best for DNAs <1 kb in size, can be used to recover both singleand double-stranded DNAs from polyacrylamide gels.  The yield of eluted DNA varies from <30% to >90% depending on the size of the DNA fragment. - [Read Isolation of DNA Fragments from Polyacrylamide Gels by the Crush and Soak Method Protocol]

Category: Viral Culture and Isolation Protocols: Viral Isolation Protocols

During incubation period and the course of disease, SARS virus replicates and releases from cells. The level of virus varies greatly from sample to sample. At early stage of incubation period or during the late convalescent phase, the concentration of virus is very low in all kinds of samples. Virus is also detected at extremely low concentrations in plasma during... - [Read Kit for Rapid Enrichment of SARS Virus]

Category: Yeast Protocols: Yeast Nucleic Acid Protocols

Flow cytometry is used to analyze the quantity of DNA in cells. Since the DNA content of cells varies through the cell cycle, this information can provide an indication of cell cycle progression. This protocol uses SYTOX Green staining. - [Read Preparation of Yeast Cells for Flow Cytometry Protocol]