PubMed · 812200
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D Ogston, B Bennett, M Mackie. 1975-11-15. Proceedings: Studies on circulating plasminogen activator.. https://pubmed.ncbi.nlm.nih.gov/812200/
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The guanidinium chloride (GdmCl) denaturation of RNAase A, lysozyme and metmyoglobin was investigated at several pH values by using absorbance measurements at 287, 300 and 409 nm respectively. From these measurements the free-energy change on denaturation, delta Gapp., was calculated, assuming a two-state mechanism, and values of delta Gapp. at zero concentration of the denaturant were measured. For each protein all delta Gapp. values were adjusted to pH 7.00 by using the appropriate relationship between delta Gapp. and pH. Dependence of the adjusted delta Gapp. value on GdmCl concentration increases for metmyoglobin and decreases for the other two proteins as the denaturant concentration decreases. It has been shown that these are expected results if the presence of the acid-denatured state during the GdmCl denaturation of proteins is considered.
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Today's technology provides portable pumps which facilitate continuous infusion of drugs to relieve suffering in terminal disease. Subcutaneous and epidural infusion is now frequently used in our hospital. The most common indications are gastrointestinal obstruction, impaired absorption of drugs, refractory side effects of oral medication or poor compliance because good pain relief is no longer possible orally. During the last days of life, this method may be the only possible approach to good comfort and relief from terminal agitation and anxiety. Of the patients referred to the advisory group for seriously ill and dying in 1990, 64% received subcutaneous infusions and 15% epidural infusions during the last days or weeks of life. Continuous infusion of drugs from portable pumps has become an almost indispensible method of treatment in an ordinary clinic.