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[en] Peripheral blood of 784 subjects working with sources of ionizing radiation was studied. They were divided in 6 subgroups challenged with different radiation load: minimal 3 ber, maximal > 90 ber. The data obtained were compared with those in a control group of 310 practically normal subjects. Statistically significant differences in reticulocyte, platelet, leucocyte, neutrophilic leucocyte and lymphocyte counts were recorded in subjects exposed to chronic low-dose radiation effects. The irradiation levels in all groups were within physiologic range. (A.B.)
[en] The dependence of the sedimentation rate of donor blood on its percentage in the sample (the degree of its dilution with physiologic saline) ranging from 0.25 to 100% (whole undiluted blood) is investigated with digital video equipment. The ratio of the value of displacement of the sediment–supernatant boundary per time unit was taken as the blood sedimentation rate. In case of registration of different speeds of movement of this boundary in a given volume of the cuvette, their spatial averaging was performed. A substantial increase in the blood sedimentation rate was found experimentally at high levels of its dilution, and, conversely, at blood concentrations in physiologic saline solutions that are close to whole blood. At the same time, the rate of blood sedimentation decreased several times with blood content in the range of 30–50%. It was experimentally shown that variation of blood content in the physiologic saline solution over a wide range did not affect the evenness of sedimentation occurring for almost any blood concentration in the mixture. In other words, in the process of sedimentation of a single blood sample of a given dilution in the physiologic saline solution, the sedimentation rate does not change with time. The experimentally obtained results allowed to build a theoretical model of blood sedimentation for two cases: 1) sedimentation of free erythrocytes (highly diluted blood) and 2) sedimentation of erythrocyte aggregates (almost undiluted blood, up to whole blood). The originality of the model comes from the proposition to consider the sedimentation of cells and/or their aggregates as a collective effect, and not in the traditional form of sedimentation of individual particles or particles interacting with each other. This model gives a satisfactory agreement with experimental laws with the use of certain empirical constants. The study is useful for understanding the process of erythrocyte sedimentation.
[en] This investigation analyzed the effect of labor on the phagocytic activity of neutrophils in women with uncomplicated term pregnancies. Nineteen healthy women who were not pregnant and did not use oral contraceptives or glucocorticoids served as controls. Peripheral venous blood samples were collected from 15 study patients who were in the active phase of labor (5-10 cm of dilation). Neutrophil phagocytic function was evaluated with the radioiodine fixation test. Assays were conducted utilizing both pooled homologous serum and autologous serum. There was no statistically significant difference in the neutrophil phagocytic function of laboring patients and controls. In addition, there was no evidence that serum from pregnant women exerted a depressant effect on phagocytosis
[en] Influence of vertical magnetic fields of ± 1200 T2m-1 on the sedimentation of red blood cells were examined. The sedimentation rate changes 10-20 % by application of the magnetic fields. This result is interpreted in terms of the magnetic force acting on the cells.
[en] Antigen sites on group A red cells were quantified by an immunoautoradiography technique. Results suggest that: (i) glutaraldehyde (1 g/1) is an ideal fixative which can preserve red cells for more than 16 months without altering antigenicity; (ii) washing of glutaraldehyde-fixed red cells with 5% bovine serum albumin reduces the risk of non-specific binding; (iii) the maximum number of antibodies bound per cell has to be determined by titration of the labelled antibody to saturating conditions; and (iv) young red cells possess 6.8% to 16% more A antigen sites than do old cells. (author)
[en] In this paper, the rouleaux size dependence of viscosity in concentrated red blood cell suspension is derived analytically, by using reversible kinetic equation of coagulation, to reveal the effect of erythrocyte aggregation on the blood viscosity. In the limit of dilute concentration and low shear rate, the result does not reduce to Casson's equation. In the end we argue Murata's result on the shear rate dependence of viscosity. (author). 8 refs, 5 figs