No abstract

Maternal posturing, in which a pregnant or laboring woman assumes specific postures with the intention of altering the position and/or presentation of the fetus within the uterus, is a safe alternative to operative procedures recommended in cases of fetal malpositions and malpresentations. Clinicians and researchers are more likely to help pregnant women understand and perform posturing correctly if they comprehend the theoretical underpinnings of the technique. In maternal posturing, the forces of gravity and buoyancy combine to form a couple that overcomes frictional forces and/or obstructions to allow the fetus to rotate within the uterus to an optimal position or presentation. Integrating an understanding of these physical processes into clinical practice and research according to the recommendations provided here should lead to greater success in correcting malpositions and converting malpresentations.

Two cases of ceroid storage in childhood are reported. In both cases there was a long history of nutritional disturbance and cirrhosis of the liver was found at necropsy. In one case the storage of ceroid followed the pattern of so-called "lipidoses," with massive numbers of ceroid-filled cells in the spleen, liver and intestinal mucosa. In the other case the deposition of ceroid occurred mostly in macrophages in the liver. No ceroid was found in smooth muscle or other parenchymal cells as in vitamin E deficiency.

Reported instances of stable nonflow in He II Josephson effect experiments have in most cases beenachieved by a flow of liquid helium from one reservoir to another, a flow driven by ultrasonic pumping. We have examined some of the characteristics of this pumping. We confirm that a threshold transducer power is necessary to initiate pumping and find that the threshold power has a temperature dependence of Ps Ta, 0 < a < 1, in the range 1.5 K < T < 2.1 K. A capacitor has always been used by others to measure the meniscus level. We find that the geometry of the core of this capacitor is important: when the core bottom is conical, with vertex pointing down, we achieve no pumping. We find that the orientation of an asymmetric pinhole plays no role. Finally, the pumping speed is a monotonic function of transducer power for powers exceeding threshold and for powers less than an upper limit, above which there is no futher increase in pumping speed. Subject Classification: 35.47.