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Biomedical subjects

E Conway

Publications and source records attributed to E Conway.

30 records · Page 2Linked to original sources
PubMed1981

The definitive identification of the lignans trans-2,3-bis(3-hydroxybenzyl)-gamma-butyrolactone and 2,3-bis(3-hydroxybenzyl)butane-1,4-diol in human and animal urine.

The definitive identification of the first lignans to be found in humans and animals is described. Gas chromatography--mass spectrometry, n.m.r. spectroscopy, i.r. spectroscopy and chemical techniques were employed to establish the structures of two lignans as trans-2,3-bis(3-hydroxybenzyl)-gamma-butyrolactone and 2,3-bis(3-hydroxybenzyl)butane-1,4-diol. Both compounds are essetially racemic. Evidence was also found for several methoxy analogues of these lignans in the vervet monkey.

4-Butyrolactone↗
PubMed1981

Increase in proliferative markers after inhibition of transglutaminase.

Cystamine inhibited transglutaminase activity (R-glutaminyl-peptide:amine gamma-glutamyltransferase, EC 2.3.2.13) of proliferating WI-38 cells in a dose-dependent manner over the concentration range 0.005-0.25 mM when added to the culture medium. The epsilon-(gamma-glutamyl)lysine content in the cells was decreased and several proliferation markers were enhanced. "Non-mitotic" cells were stimulated by cystamine (about 25% of that observed with 10% fetal bovine serum) to undergo DNA synthesis with subsequent increases in nuclei number. Numerous other disulfides, thiols, and amines were ineffective when added to culture medium. The findings are supportive of the concept that growth control involves a relationship between isopeptide crosslinks and proliferation.

Cell Division↗
PubMed1977

Transglutaminase activity in normal and transformed cells.

Transglutaminase activity was determined in normal and transformed paired cell systems. Reduced enzyme activity was found in virus-transformed human and hamster cells and in chemically transformed mouse cells relative to normal counterparts. Most of the enzyme activity was localized in the particulate fraction sedimenting at 105,000 X g. Enzyme activity was highest when normal cell populations were in an essentially nonmitotic state. Protein capable of incorporating putrescine was present in normal and transformed human cells, although the rate of incorporation was lower in the latter. The putrescine acceptor in the normal cell paralleled enzyme activity and enzyme distribution. Trypsin (5 microng/ml) treatment of the normal cell resulted in a 3-fold increase in enzyme activity, which occurred independently of protein synthesis.

Cell Division↗
PubMed1976

Amino acid and hexose transport of normal and simian virus 40-transformed human cells.

Studies on amino acid and hexose transport were performed on human WI-38 cells and WI-38 SV40-transformed cells (VA13A and VA13-2RA). Depending upon cell line or conditions, either no difference or a relative decrease in initial uptake by transformed cells was found. Under similar growth conditions, transformed hamster cells (PyBHK-21/C13) had increased uptake, compared with the normal hamster cells (BHK-21/C13). The normal and transformed human cells were also similar in sialic acid content and agglutinated when treated with concanavalin A.

Agglutination Tests↗
PubMedDate not supplied

Effects of methyldopa metabolites on amine transmitters and adrenergic receptors in rat brain.

Studies of catecholamine concentrations in defined nuclei from the anterior hypothalamic-preoptic regions and the medulla oblongata, known to contribute to cardiovascular control, were measured following acute or chronic methyldopa administration. These studies indicated that methyldopa was enzymatically converted to methyldopamine and methylnorepinephrine, and in some areas to methylepinephrine which replaced endogenous epinephrine. The predominant metabolite was methylnorepinephrine, which accumulated in concentrations higher than endogenous norepinephrine levels. (-)Methylnorepinephrine was found to be 6 times more potent and 75 times more selective for alpha 2-adrenergic receptors than (-) norepinephrine, and it is suggested that this alpha 2-adrenergic receptor action, particularly in the nucleus tractus solitarius, contributes to a major part of the antihypertensive effect of methyldopa.

Animals↗
PubMedDate not supplied

Rn Delegation: the New Jersey Task Force recommendations.

Because licensure and delegation clauses are determined state by state, all statewide home care associations need to begin a dialogue concerning delegation and how it impacts the nurse's practice and the way agencies deliver care in the community. State organizations need to communicate with each other and share concerns and experiences with other state home care organizations. Nursing boards, nursing and home health aide associations, advocates for long-term care patients, and the older population also need to be involved in the discussion. This open dialogue between many different organizations concerning delegation will ensure that patients receive safe, quality care that is also cost effective.

Clinical Competence↗