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Biomedical subjects

E Hansen

Publications and source records attributed to E Hansen.

At least 127 records · Page 7Linked to original sources
PubMed1982

Antigen-specific electrophoretic cell separation (ASECS): isolation by human T and B lymphocyte subpopulations by free-flow electrophoresis after reaction with antibodies.

The electrophoretic mobility of human lymphocytes can be reduced by incubation with surface antigen specific antibodies under non-capping conditions. This renders subpopulations of human peripheral blood lymphocytes accessible to separation by free-flow electrophoresis. After reaction of lymphocyte preparations with anti-IgM antibody and a fluorescent second antibody, B lymphocytes showed a considerable shift in position in preparative cell electrophoresis and could be separated with high yield, purity and vitality. Similarly, a T cell subpopulation reactive with the monoclonal antibody T811 could be isolated, even though only small amounts of this antibody were bound, by using a double-sandwich method. Non-specific antibody uptake via Fc-receptors did not contribute to the observed shift of antibody-labelled cells to lower electrophoretic mobility. Flow cytometric analysis showed that cells were separated according to their antigen density. Thus cell electrophoresis can be used to separate antibody-labelled cells. With a flow rate of 100,000 cells/sec this method has a much higher separation capacity than fluorescence-activated cell sorting. The described method should be applicable to the separation of a wide range of cell populations for which specific antibodies are available.

Animals↗
PubMed1980

Behavioural and developmental effects of butylated hydroxytoluene dosed to rats in utero and in the lactation period.

Butylated hydroxytoluene (BHT) 500 mg/kg body wt/day was given in the diet to Fo-rats from 6 weeks of age to weaning of the F1-generation (growth period to age 19 week, gestation period and lactation period) and subsequent to F1-animals until 21 days of age. Body weight of F0-animals was recorded, and the influence on the F1-generation was investigated applying crossfostering. Mortality, litter size, weight gain and some developmental events as well as tests for auditory and visual function and locomotor coordination in the F1-generation were recorded. The applied dose of BHT exerted a significant adverse effect on body weight in both F0 and F1-animals and on several developmental parameters in F1-animals. The effects arose during the lactation period.

Animals↗
PubMed1980

Soluble immune complexes in cerebrospinal fluid of patients with multiple sclerosis and other neurological diseases.

The occurrence of soluble immune complexes (IC) in the cerebrospinal fluid (CSF) of 14 multiple sclerosis (MS) patients, four acute polyradiculoneuritis patients, 30 patients with other neurological diseases (OND) and 30 patients with disc prolapse (DP) was examined by a solid phase C1q-protein A binding assay (C1q-PABA) and a complement consumption test. IC-positive reactions were observed only in the C1q-PABA. The binding indices determined by the C1q-PABA differed significantly (P < 0.01) when the MS or the OND patient groups were compared to the DP group. No significant (P < 0.1) difference was observed between the indices in the MS and OND groups. Binding indices in C1q-PABA showed no correlation either to IgG concentration, total protein concentration or cell counts in CSF of MS patients. Three of the four polyradiculoneuritis patients were strongly IC-positive while the fourth patient was negative. Filtration and PEG-precipitation data indicated that a major part of the IgG-containing IC in CSF detected by C1q-PABA was of macromolecular nature.

Adolescent↗
PubMed1980

[Mid-systolic click syndrome, coronary spasm and sudden death. General review apropos of a tracing from terminal Prinzmetal's angina, recorded by the Holter method].

The authors review the literature on arrhythmias and ST changes, the principal causes of sudden death in the mid systolic click-late systolic murmur (SC-SM) syndrome, having recorded the ECG during sudden death of a patient with this syndrome by Holter monitoring. This would also appear to be the first reported case of sudden death recorded by this technique. It showed that death was caused by ventricular fibrillation which was preceded by a clinical and electrical episode of Prinzmetal angina. Hypotheses explaining the abnormalities of ventricular repolarisation and rhythm in so-called "idiopathic" SC-SM syndrome are reviewed. Special attention is paid to studies suggesting the participation of coronary spasm and autonomic nervous system disturbances. In conclusion, the authors underline: - the value of ambulatory electrocardiography in patients with the SC-SM syndrome and especially in a defined high risk group; - the value of testing for coronary spasm when coronary angiography is envisaged; - the need for better management with antiarrhythmic therapy. The indications of betablockade are discussed as these drugs are thought to favourise coronary spasm.

Angina Pectoris↗
PubMed1979

High capacity suction technique. A method of reducing the aspiration hazard during induction.

A suction booster is described which may be interposed between the endotracheal tube and the main suction system. This allows suction to be instantly ready throughout the intubation procedure, the rate of suction to be increased up to ten-fold, and all solid particles which can pass through the tracheal tube to be removed without the risk of blockage.

Intubation, Intratracheal↗
PubMed1979

Typical and atypical monochromacy studied by specific quantitative perimetry.

Two blue cone monochromats and four rod monochromats have been studied by increment threshold measurements applying the Stiles' principle. Some rudimentary colour discrimination was reported by the blue cone monochromats. One patient showed good discrimination between short- and middle-wavelength lights in matching experiments using the Nagel II apparatus. His neutral band in the spectrum was at lambda = 485--495 nm. Dichromatic vision could not be proved in the other patient. The blue cone monochromats also had good responding blue mechanism in the periphery. Indication of cone activity other than blue cones is found in both kinds of monochromats; these cones being probably of the rhodopsin-cone type (pi0 cones). The conclusions are drawn that the inhibitory effect of the pi0 cones upon the rod mechanism may account for the differences shown by our two blue cone monochromats as to visual acuity, nystagmus and photophobia. Likewise, their differences regarding dichromatic vision may be explained by an unequal number of pi0 cones in their retinas rather than by differences in their blue mechanisms.

Adolescent↗