Effect of a constant magnetic field of ultra-high intensity on the morphologic composition of peripheral blood

An exposure of mice to a constant magnetic field (CMF) of 9.9, 25.4 and 39.4 kersted produced changes in the leucocyte and reticulocyte counts and caused no changes in the red blood cell count and hemoglobin. The changes noted during and after the exposure were of a cyclic pattern. During a 24-hour exposure of animals to a CMF of 39.4 kersted a short-term increase in the reticulocyte and leucocyte counts and a concomitant decrease of the neutrophil and lymphocyte counts were noted. Afterwards the reticulocyte count decreased and increased again by the end of the exposure. Following a 3-hour exposure to CMFs of the above intensities the changes persisted for 20-35 days. Normally the parameters increased during the 1-2 days of the exposure and decreased thereafter. The level of changes was not correlated with the CMF intensity. The increase in the reticulocyte count during and exposure to a CMF of 39.4 kersted was identical to that during an exposure to a CMF of I kersted.     

Changes in brain memory functions as affected by a constant magnetic field]

OBJECTIVE: The preferred route of delivery for breech presentation has been controversial. We compared the birth weight-specific neonatal mortality of vaginal births to cesarean births in singleton births with breech presentation. METHODS: A total of 371,692 singleton live births with breech presentation were selected for the study from the United States birth cohorts for the years 1989-1991. Differences in birth weight specific mortality were compared using a z-statistic for differences in proportions and by logistic regression. RESULTS: Compared to primary vaginal births, primary cesarean births had significantly lower neonatal mortality for all birth weight groups, despite increased prevalence of fetal malformations in the cesarean as compared with vaginally delivered group. This mortality difference was greatest in the first hour of life. Difference in overall neonatal (less than 28 days) mortality rate ranged from a low of 1.6-fold in the 500-749 g group (726.6 per 1000 vaginal births compared with 456.3 per 1000 cesarean births, P < .001) to as high as about three-fold in the 1250-1499 g group (232.9 per 1000 vaginal births compared to 72.5 per 1000 cesarean births, P < .001). In the group with birth weights over 2500 g, neonatal mortality in the primary vaginal births was 5.3 per 1000 and in the primary cesarean births, 3.2 per 1000 (P < .001). Similarly, repeat cesarean births had significantly lower birth weight-specific neonatal mortality, compared with vaginal births after previous cesarean. CONCLUSION: Singleton live births with breech presentation delivered by cesarean had lower birth weight-specific neonatal mortality as compared with vaginal births.     

Effect of magnetic field on reduction of magnetite

The reduction behaviour of magnetite oxide by hydrogen below Curie temperature was investigated in the presence of external magnetic field by thermogravimetric analysis. The reduction rate of magnetite powder increased with increasing external magnetic field strength below Curie temperature of magnetite. In order to figure out the effect of external magnetic field on reduction of magnetite, two types of magnetite, powder and pellet, were studied. It was possible to enhance the reduction rate of magnetite powder, because the particles of magnetite in the presence of an external magnetic field exposed more surface to the reducing gas. The effects of reduction temperature, reducing agent, iron oxide type, particle size and specimen shape on the metallisation behaviour of magnetite were visually clarified below the Curie temperature under the influence of external magnetic field. Despite of the increase in reduction degree by applied magnetic field, the rate controlling step was not changed due to the formation of porous metallic iron layer that keeps the path for reducing agent to approach the unreduced iron oxide in the core of magnetite particle.