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Biomedical subjects

D McKenzie

Publications and source records attributed to D McKenzie.

At least 91 records · Page 5Linked to original sources
PubMedDate not supplied

Challenges of recording human fetal auditory-evoked response using magnetoencephalography.

OBJECTIVE: Our goals were to successfully perform fetal auditory-evoked responses using the magnetoencephalography technique, understand its problems and limitations, and propose instrument design modifications to improve the signal quality and success rate. METHODS: Fetal auditory-evoked responses were recorded from four fetuses with gestational ages ranging from 33-40+ weeks. The signals were recorded using a gantry-based superconducting quantum interference device. Auditory stimulus was 1 kHz tone burst. The evoked signals were digitized and averaged over an 800 ms window. RESULTS: After several trials of positioning and repositioning the subjects, we were able to record auditory-evoked responses in three out of the four fetuses. Since the superconducting quantum interference device array design was not shaped to fit over the mother's abdomen, we experienced difficulty in positioning the sensors over the fetal head. CONCLUSIONS: Based on this pilot study, we propose instrument design that may improve signal quality and success rate of the fetal magnetic auditory-evoked response.

Equipment Design↗
PubMedDate not supplied

A comparison of highly unsaturated fatty acid levels in wild and farmed eels (Anguilla anguilla).

1. Absolute and relative amounts of eicosapentaneoic acid (EPA) and docohexaenoic acid (DHA) in muscle of eels from four different fish farms were compared with samples from wild eels from two different areas of northern Italy. 2. Farmed eels were richer in DHA and EPA than wild animals. 3. The addition of cod liver oil to the diet of farmed eels led to a significant accumulation of EPA and DHA, but no change in total lipid content. 4. The calculation of two indices related to highly unsaturated fatty acid (HUFA) content (FLQ = fish lipid quality; AI = aterogenic index), indicated the higher nutritional value of farmed vs wild fish. 5. We conclude that farmed eels are an adequate source of fish products for human nutrition and propose use of the above-mentioned indices as an effective means for assessing fish nutritional quality for populations at high risk of chronic degenerative disease.

Animals↗