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Biomedical subjects

I Chuang

Publications and source records attributed to I Chuang.

6 recordsLinked to original sources

The clinical bioinformatics ontology: a curated semantic network utilizing RefSeq information.

Existing medical vocabularies lack rich terms to describe findings that are generated by modem molecular diagnostic procedures. Most bioinformatics resources were designed primarily to support the needs of the research community. We describe the development of a curated resource, the Clinical Bioinformatics Ontology (CBO), a semantic network appropriate for describing clinically significant genomics concepts. The CBO includes concepts appropriate for both molecular diagnostics and cytogenetics. A standardized methodology based on consistent application of RefSeq information is applied to the curation of the CBO in order to provide a reproducible and reliable tool. Challenges related to this curation process are discussed in this paper. At the time of submission the CBO included 4,069 concepts, associated by 8,463 relationships.

Computational Biology↗

Improved detection of viruses by electron microscopy after direct ultracentrifuge preparation of specimens.

We have adapted the Beckman Airfuge air turbine ultracentrifuge and the new EM-90 particle-counting rotor to improve detection by electron microscopy of viruses in clinical specimens. Samples were clarified by centrifugation, pelleted in the EM-90 rotor directly to Formvar-coated copper grids, and strained with 1.5% sodium phosphotungstate. Virus counts and endpoint titrations of serial dilutions of partially purified preparations of poliovirus, SA11 rotavirus, herpes simplex virus, and vaccinia virus showed an increase of ca. 1.5 log10 to 3.0 log10 over the virus titers of unconcentrated preparations of the same material. An increased yield of 14% more positive specimens for rotavirus was obtained after preparation of clinical samples by direct ultracentrifugation versus a method without virus concentration (82 versus 72). A prospective study showed that detection of adenoviruses, herpesviruses, and enteroviruses increased when specimens were prepared by direct ultracentrifugation. Direct ultracentrifugation with the EM-90 rotor in the Airfuge ultracentrifuge is a rapid concentration method which enhances the rate and yield of virus detection from clinical specimens by electron microscopy and is easily adaptable to a diagnostic virology laboratory.

Cytomegalovirus↗