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Biomedical subjects

D P O'Mathúna

Publications and source records attributed to D P O'Mathúna.

13 recordsLinked to original sources
PubMed2001

What is homeopathy?

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Attitude to Health↗
PubMed2000

Evidence-based practice and reviews of therapeutic touch.

PURPOSE: To present principles for accurately representing research for evidence-based practice and health care policies, and to evaluate how original research results indicated adherence to those principles in literature reviews of therapeutic touch. ORGANIZING CONSTRUCTS: Critical thinking and scientific integrity. SOURCES: Reviews of therapeutic touch literature published in nursing journals between 1994 and 1998 and the research studies cited in those reviews. METHODS: Statements made in reviews about the efficacy of therapeutic touch were compared with the results and conclusions of the research cited. General conclusions reported in reviews were evaluated against a broad range of therapeutic touch (TT) research studies, including many not cited in reviews. How accurately reviewers represented the research studies was evaluated by comparing reviewers' conclusions with those of the researchers. Findings were organized into principles to guide evidence-based reviews. FINDINGS: Literature reviews about therapeutic touch often cited only research with favorable findings. When citing studies with contradictory findings, only the favorable findings were usually mentioned. In many reviews, research cited as indicating the efficacy of therapeutic touch indicated it was ineffective. Every review examined had at least one significant mistake concerning how research studies were represented. CONCLUSIONS: Accurate presentation of original research results is needed to make evidence-based decisions and to ensure that limited healthcare resources are used effectively and safely. Evidence-based principles should be followed in reviewing therapies and practices, including alternative therapies.

Evidence-Based Medicine↗
PubMed1995

New labdane diterpene glycosides from Amphiachyris amoena.

Five new labdane diterpene glycosides, amoenolide A 19-beta-D-glucopyranoside [1], and amoenolides E [3], F [4], G [6], and H [8] were isolated from the above-ground parts of Amphiachyris amoena. Amoenolide F is a 19-beta-D-glucopyranoside, while the others are 6-alpha-L-arabinopyranosides. Their structures were established by chemical and spectral methods, especially high-field nmr techniques, and complete 1H- and 13C-nmr assignments are given.

Carbohydrate Sequence↗
PubMed1995

Modified labdane diterpenes from Amphiachyris amoena.

Two new modified labdane diterpenes, amoenolide L [1] and amoenolide M [2] with a 3-(p-hydroxyphenyl)propionate ester unit, were isolated from the above-ground parts of Amphiachyris amoena. Their stereochemical structures were assigned by spectral methods including uv, ir, fabms, and one- and two-dimensional high field 1H- and 13C-nmr. Properties of their acetate derivatives are also recorded.

Diterpenes↗
PubMed1995

Amoenolide K and amoenolide K 19-acetate, two grindelane peroxides from Amphiachyris amoena. Isolation, structure determination, and preparation of amoenolide K from amoenolide A by photochemical oxygenation.

Two new 9,13-diepoxy labdane diterpenes, amoenolide K [1] and its 19-acetate [2], were isolated from the aerial parts of the composite Amphiachyris amoena and their structures were established by spectral methods, especially high-field nmr spectroscopy. Amoenolide K [1] was prepared from amoenolide A [3] by singlet oxygen addition via the ene reaction. A study was made of the ene reaction products with amoenolide K triacetate [5] which showed them to arise from stereospecific oxygen addition to the 8,9-double bond, with the exception of the sterically hindered beta-side at C-9, for which no products were isolated.

4-Butyrolactone↗
PubMed1994

Amoenolide A and related acetylated labdane diterpenes from Amphiachyris amoena.

Four new labdane diterpenes, amoenolide A [1] and its 19-acetate [2], 6-acetate [3], and 6,19-diacetate [4], were isolated from the above-ground parts of Amphiachyris amoena and their structures established by spectral and chemical methods. High-field 1H- and 13C-nmr assignments were made for each compound using 1D and 2D nmr techniques including 1H single-frequency spin-coupling and nOe difference experiments, one-bond and long-range carbon-hydrogen correlations, and the INADEQUATE carbon-carbon connectivity experiment. The absolute stereochemistry was established by the Horeau partial-resolution chemical method with amoenolide A and racemic 2-phenylbutyric anhydride, and by the cd exciton splitting physical method on the synthetic amoenolide A 2-acetate 6,19-dibenzoate [9].

4-Butyrolactone↗
PubMed1994

Five new labdane diterpenes from Amphiachyris amoena.

Five new labdane diterpenes, amoenolide A 19-aldehyde [2], and amoenolides B [3], C [4], D [5], and J [6] were isolated from the above-ground parts of Amphiachyris amoena, and their structures determined by spectral methods, in particular high-field nmr, and selective chemical studies. Amoenolide J [6] had its carbon skeleton established by the INADEQUATE 13C-13C connectivity nmr experiment.

4-Butyrolactone↗