Biomedical subjects

D Nickel

Publications and source records attributed to D Nickel.

12 recordsLinked to original sources

PubMed2002

Experimental evidence for supercontinuum generation by fission of higher-order solitons in photonic fibers.

We report on an experimental study of supercontinuum generation in photonic crystal fibers with low-intensity femtosecond pulses, which provides evidence for a novel spectral broadening mechanism. The observed results agree with our theoretical calculations carried out without making the slowly varying envelope approximation. Peculiarities of the measured spectra and their theoretical explanation demonstrate that the reason for the white-light generation in photonic crystal fibers is fission of higher-order solitons into redshifted fundamental solitons and blueshifted nonsolitonic radiation.

Journal Article↗

PubMed1993

[Stoicism and stoics in Galen's manuscript De foetuum formatione].

Explore the source record for details and available documents.

Embryology↗

PubMed1991

Effect of a sensitive thyrotropin-stimulating hormone assay on dosing of L-thyroxine.

The Wisconsin Veterans Home has had a special interest in thyroid disease since 1986. Until recently, dosage adjustment of L-thyroxine in residents with primary hypothyroidism was accomplished by individual physicians guided by standard thyroid function tests. A shift to a sensitive thyrotropin-stimulating hormone (TSH) assay provided an opportunity to assess the frequency of sensitive TSH suppression secondary to excessive doses of L-thyroxine which would not be recognized by the standard TSH assay. We reviewed the charts of 46 residents who were not acutely ill and had been in the facility at least 6 months. Sensitive TSH was determined while on a stable dose of L-thyroxine for a minimum of 6 weeks. Six residents (13%) had low sensitive TSH levels indicating an excessive dose of L-thyroxine. The application of the sensitive TSH assay resulted in dose reduction.

Aged↗

PubMed1981