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Biomedical subjects

H Walters

Publications and source records attributed to H Walters.

46 records · Page 3Linked to original sources
PubMed1975

On the dissociation and association of Escherichia coli ribosomes.

The dissociation and association behaviour of 70-S ribosomes of Escherichia coli has been studied. It has been shown that the dissociation-association reaction can be both a real dynamic equilibrium and a non-equilibrium reaction, dependent upon the ionic conditions of the solvent. At relatively high ionic strength (I = 0.15 M or more) the dissociation-association reaction is an equilibrium reaction, whereas at lower ionic strength (I = 0.1 M or less) there is no dynamic equilibrium between 70-S ribosomes and its subunits. In the latter case a hysteresis in the dissociation-association reaction is observed. Whether there is a dynamic equilibrium or not can be demonstrated by a single centrifugation experiment, using the analytical ultracentrifuge.

Escherichia coli↗
PubMedDate not supplied

Vascular calcification, autonomic neuropathy, and peripheral blood flow in patients with diabetic nephropathy.

The possibility that digital gangrene in patients with diabetic nephropathy might be due to abnormalities of peripheral blood flow secondary to vascular calcification has been investigated. Twenty patients with renal failure due to diabetic nephropathy were studied. Peripheral blood flow was measured using venous occlusion plethysmography, together with an assessment of medial arterial calcification on plain radiographs of the hands and feet, and transcutaneous oxygen tension (TcPO2). Hallux blood flow was markedly raised (median 22.5, range 11.5-56.5, ml min-1 100-ml-1) compared with non-diabetic control subjects (4.7, 1.1-10.5, ml min-1 100-ml-1; p less than 0.01) and similar to that in diabetic patients with autonomic neuropathy (29.5, 16.7-49.6, ml min-1 100-ml-1). Although vascular calcification was common and extensive in the patients with diabetic nephropathy, TcPO2 measurements in the supine foot were normal and did not indicate tissue ischaemia. We conclude that despite extensive vascular calcification high peripheral blood flow occurs in the feet of these patients at rest together with normal transcutaneous oxygen tension.

Adult↗