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  • Influence
-Glutamyl transpeptidase: elevated activities in certain neurologic diseases.
γ -glutamyl transpeptidase, an enzyme found by histochemical means to be located near the luminal border of endothelial cells, is shown to be elevated in the sera of patients with epilepsy.Expand
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Improved determination of prostatic acid phosphatase (sodium thymolphthalein monophosphate substrate).
We have modified a previously described method for determining acid phosphatase, with thymolphthalein monophosphate as substrate, to increase its sensitivity. We assessed effects of serum onExpand
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Transferability studies for the AACC reference method and the IFCC method for measurement of alkaline phosphatase activity.
We present the results of measurements of alkaline phosphatase activity from interlaboratory transferability studies conducted by 12 laboratories in five countries. The variability, as demonstratedExpand
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Patterns of enzyme activity following myocardial infarction and ischemia.
Biochemical patterns in serum reflect (a) necrotic, and (b) reparative processes in tissues. Elevations of serum creatine kinase, lactate dehydrogenase, and aspartate aminotransferase are widely usedExpand
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Synthesis of Cibachron blue F3GA-amylose with increased sensitivity for determination of amylase activity.
  • L. Ewen
  • Chemistry, Medicine
  • Clinica chimica acta; international journal of…
  • 30 August 1973
Abstract Parameters influencing the preparation of Cibachron Blue F3GA-Amylose, a chromogenic substrate for estimation of amylase activity, are examined in relation to their influence on theExpand
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Separation of alkaline phosphatase isoenzymes and evaluation of the clinical usefulness of this determination.
  • L. Ewen
  • Biology, Medicine
  • American journal of clinical pathology
  • 1 February 1974
A simple technic for separation of alkaline phosphatase isoenzymes on agarose gel, using thymolphthalein monophosphate as the isoenzyme indicator substrate, is described. Results demonstrate thatExpand
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Lactate dehydrogenase isoenzyme 1: Its usefulness as a screening test in diagnosis of myocardial infarction.
  • L. Ewen
  • Medicine
  • Clinical biochemistry
  • 1 October 1983
Immunological assay of LD-1 activity provides a quantitative measurement of the type of lactate dehydrogenase (LD, EC 1.1.1.27) activity characteristic of myocardial origin. Using this test, aExpand
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Antidystrophic effect of selenium and other agents on chicks from vitamin E-depleted hens.
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An inhibitor of mitochondrial respiration in venom of the Australian bull dog ant, Myrmecia gulosa.
  • L. Ewen, D. Ilse
  • Biology, Medicine
  • Journal of insect physiology
  • 1 August 1970
Abstract Venom of the Australian bull dog ant, Myrmeciȧ gulosa , is shown to inhibit the respiration of insect mitochondria. An effect of mammalian cytochrome- c in alleviating the inhibition in theExpand
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