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Assembling Aggregates between Embryonic Stem (ES) Cells and Diploid Embryos Protocol - http://www.cshprotocols.org/cgi/content/extract/2006/21/pdb.prot4424

Category: Mouse Protocols: Assembling Chimeras Mouse Protocols

Protocol describes a method for assembling aggregates between ES cells and diploid embryos. The resulting chimeras are useful for separating certain extraembryonic phenotypes from phenotypes in the embryo proper, since the diploid embryo contributes to all parts of the conceptus, but the ES cell component does not contribute to the trophoblast or yolk sac endoderm. - [Read Assembling Aggregates between Embryonic Stem (ES) Cells and Diploid Embryos Protocol]

Purification of Mammalian Liver Mitochondria by Flotation Through a Pre-formed Discontinuous Iodixan - http://www.axis-shield.com/densityhome/optiprep/S15.pdf

Category: Cell Organelle Protocols: Subcellular Fractionation Protocols: Mitochondria Isolation Protocols

This protocol describes a discontinuous gradient, which resolves the mitochondria from both lighter and denser organelles. Because the centrifugation is carried out for 4 h, diffusion will create a partially continuous gradient and this probably contributes to the resolution of the mitochondria from the lighter lysosomes. - [Read Purification of Mammalian Liver Mitochondria by Flotation Through a Pre-formed Discontinuous Iodixan]

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Absorption Spectroscopy and Quantification of Filamentous Phage Protocol

Unlike spherical phage, such as T4 and λ, which have roughly equal weight ratios of protein to DNA, filamentous phage have about six times more protein than DNA; the protein therefore contributes substantially to the absorption spectrum.