Ice tea has a complex composition, which leads to reduced filterability, and a decrease in sample throughput. Its composition can generate background or false positive signals. It is also well known that ice tea contains molecules that can inhibit the bioluminescence reaction, which can generate false negative results. The aim of this study was to develop a protocol that was able to neutralize these affects and enable faster detection of contamination. - [Read Microbial Detection in Ice Tea Using the Millipore Milliflex Rapid Microbiology Detection System]
A. thaliana has a very small haploid genome and this makes obtaining DNA somewhat difficult. The most notable problem is that DNA is usually contaminated with polysaccharide which inhibit restriction enzymes as well as other DNA modifying enzymes. This problem is most easily solved by using young plants which have not accumulated as much polysaccharide as older plants. The best results are obtained with plants that are two to three weeks post germinated. - [Read Plant DNA Extraction Protocol]
This protocol introduces the use of a liquid-filled wash chamber that separates unbound cells by gravity thereby eliminating uncontrolled shear forces and passage of adherent cells through a liquid/air interface. The cells are loaded with a fluorescent dye (6-carboxyfluorescein diacetate) for detection although other methods such as radioactive labels malabels may be used. This protocol is also useful for assaying molecules that promote or inhibit cell adhesion. - [Read Protocol for Measurement of Cell Adhesion Under Static Conditions]
The DNA Ligation protocol described here contains the steps required to join together using ligase enzyme both plasmid DNA and insert DNA fragments in order to create a new plasmid. This new ligated plasmid can be transformed after into competent bacteria to produce DNA for mini, midi or maxi-prep isolation.
3' Rapid Amplification of cDNA Ends RACE Using PCR Protocol. This protocol contains the steps for 3' end rapid amplification of mRNA by PCR. The first-strand cDNA is synthesized from total or poly(A+) RNA by priming from the poly-A tail of the mRNA using a oligo (dT) adaptor primer. The cDNA is then amplified via PCR using a gene-specific primer and an adaptor primer.
Histone H1 Kinase Activity Assay Protocol. This protocol describes assaying kinase activity of a putative kinase using Histone H1 as the substrate. Histone H1 is the canonical kinase substrate in this type of assay. Phosphorylation of Histone H1 is assessed by SDS-Polyacrylamide gel electrophoresis followed by autoradiography.
This protocol a protocol on how to generate transfected embryonic stem (ES) cell clones. The previous protocol in this series is the Protocol for Electroporation of ES cells. The next protocol in the series is the Protocol on Disaggregation, Expansion, and Freezing of Transfected ES Clones.