Volume 1 • Issue 4 • 1000e111 Biochem Anal Biochem ISSN:2161-1009 Biochem, an open access journal Labeling molecules without losing its activity has a long track in science. The first labeling method for detection of the biomolecules was the use of radioisotope entities like 32P, which have been successfully employed to study protein–protein, protein–DNA, protein–RNA and protein–ligand interact...

BACKGROUND Microarray platforms will change immunochemical and nucleic acid-based analysis of cell homogenates and body fluids compared with classic analyses. Microarrays use labeled target and immobilized probes, rather than fixed targets and labeled probes. We describe a method for simultaneous labeling of nucleic acids and proteins. METHODS Horseradish peroxidase- and fluorescein-modified ...

Strain-promoted cycloadditions of cyclic nitrones with cyclooctynes proceed with rate constants up to 3.38 ± 0.31 M(-1) s(-1) in CD(3)CN, or 59 times faster than the analogous reaction of azides. This highly specific modular labeling strategy can be applied for direct labeling of proteins and for live cell imaging of cancer cells.

Direct incorporation of azide groups into RNA oligonucleotides by in vitro transcription reactions in the presence of a new azide-modified UTP analogue, and subsequent posttranscriptional chemical labeling of azide-modified oligoribonucleotide transcripts by click and Staudinger reactions are described. This postsynthetic labeling protocol is robust and modular, and offers an alternative access...

Many studies have now confirmed that sperm DNA fragmentation (SDF) is associated with a poorer outcome of some forms of assisted reproduction technology. For this reason, SDF is an important parameter to evaluate in male fertility assessment. TUNEL (terminal deoxynucleotidyl transferase dUTP nick end labeling) assay coupled to flow cytometry is one of the most promising methods for SDF quantifi...

background for the purpose of understanding the food and drug administration’s (fda’s) concerns regarding online promotion of prescription drugs advertised directly to consumers, this study examines notices of violations (novs) and warning letters issued by the fda to pharmaceutical manufacturers.   methods the fda’s warning letters and novs, which were issued to pharmaceutical companies over a...