OBJECTIVE To determine whether the health of Porton Down volunteers (PDV) has suffered as a result of their participation in medical trials, during which they were exposed to single low dose concentrations of chemical warfare agents. METHODS Data were obtained from a self-selected series of ex-Porton Down volunteers who attended the MOD's Porton Down Volunteers' Medical Assessment Programme (...

While photonic Doppler velocimetry (PDV) is becoming a common diagnostic in dynamic compression research, its limiting accuracy and precision are not well understood. Velocity resolution is known to be inversely proportional to the time resolution, but resolution estimates differ by one to two orders of magnitude. Furthermore, resolution varies with the number of recorded signals and how these ...

Abstract The study has aimed to investigate and determine the anatomical position, shape, size, histological features of ductus venosus, its role as a shunt in fetal circulatory system domestic ruminants. research was conducted on 19 bovine, 11 sheep 5 goat fetuses, aborted at late stage pregnancy or deceased just after delivery. general anatomy venosus investigated by in-situ dissection corros...

Of the two umbilical veins formed in young rat embryos, the light regresses early while the left persists until birth. In a number of rat fetuses from mothers subjected to a transitory deficiency of pteroylglutamic ("folio") acid during pregnancy, this pattern was reversed and the right, instead of the left, umbilical vein persisted until birth. In such cases, the ductus venosus was always abse...

Umbilical artery\vein, middle cerebral artery, and ductus venosus Doppler velocimetry were performed at 33 weeks of gestation in the settings of an intrauterine growth restricted fetus during a heart rate deceleration. Interestingly, we recorded a sudden onset redistribution of fetal blood flow with fetal bradycardia. Spontaneous normalization of waveforms was observed once fetal heart rate ret...