The conserved Rieske oxygenase DAF-36/Neverland is a novel cholesterol-metabolizing enzyme.

Steroid hormones play essential roles in a wide variety of biological processes in multicellular organisms. The principal steroid hormones in nematodes and arthropods are dafachronic acids and ecdysteroids, respectively, both of which are synthesized from cholesterol as an indispensable precursor. The first critical catalytic step in the biosynthesis of these ecdysozoan steroids is the conversion of cholesterol to 7-dehydrocholesterol.

Evaluation of cardiac assays on a benchtop chemiluminescent enzyme immunoassay analyzer, PATHFAST.

Devices for cardiac immunoassay are widely available at point of care settings. The lateral flow method is the most popular solution for ease of use. But its major shortcomings, poor assay precision, and low analytical sensitivity may lead to false negative results.

A new time-resolved fluorometric microarray detection system using core-shell-type fluorescent nanosphere and its application to allergen microarray.

We have developed a new time-resolved fluorometric (TRF) microarray detection system consisting of fluorescent NH2 nanosphere, TRF microarray detector and gamma-irradiated polystyrene chip. Using the TRF microarray detector, we detected 500 particles of the fluorescent nanosphere in one channel. Cross-talk fluorescence from the adjacent channels was little observed in the TRF microarray detector (<0.

A core-shell-type fluorescent nanosphere possessing reactive poly(ethylene glycol) tethered chains on the surface for zeptomole detection of protein in time-resolved fluorometric immunoassay.

To increase the sensitivity and to depress the nonspecific binding in biochemical assays, a new core-shell-type fluorescent nanosphere (106.7 nm) covalently conjugated with antibody was prepared. The core-shell-type nanosphere was constructed by dispersion radical polymerization of styrene in the presence of heterotelechelic poly(ethylene glycol) (PEG) macromonomer, which has a polymerizable vinylbenzyl group at one end and a primary amino group at the other chain end and used as well as a surfactant.

Highly sensitive time-resolved fluorometric determination of estrogens by high-performance liquid chromatography using a beta-diketonate europium chelate.

A new fluorescent europium chelate labeling reagent, 5-(4"-chlorosulfo-1',1"-diphenyl-4'-yl)-1,1,1,2,2-pentafluoro-3,5-pentanedione (CDPP), was synthesized for the time-resolved fluorometric detection of HPLC. The label can be directly bound to amino or phenolic hydroxyl groups of analytes with its chlorosulfonyl group, and the labeled analytes are separated on a HPLC column. After separation, EuCl(3), TOPO (tri-n-octylphosphine oxide), and Triton X-100 were added by post-column introduction to the eluent, and the fluorescence of the europium chelate was measured with the time-resolved fluorometric detector.