Acoustic regularities in infant-directed speech and song across cultures.

When interacting with infants, humans often alter their speech and song in ways thought to support communication. Theories of human child-rearing, informed by data on vocal signalling across species, predict that such alterations should appear globally. Here, we show acoustic differences between infant-directed and adult-directed vocalizations across cultures.

Biomechanical review: Coe-alginate impression techniques.

The authors have found Coe-alginate to have many uses in podiatric surgery. They describe the technique and believe that its reproduction quality is superior to that obtained by using other materials.

Bilateral diaphragmatic paralysis as a possible paraneoplastic syndrome from renal cell carcinoma.

Bilateral diaphragmatic paralysis is rare. We describe a patient with bilateral diaphragmatic paralysis who died 18 months after initial presentation and who was found to have renal cell carcinoma. At autopsy, no intrathoracic tumor was found that would explain the diaphragmatic paralysis.

Drift in interference filters. Part 1.

Studies of narrow-band interference filters have shown that two mechanisms exist that cause drift to shorter wavelengths. One is dependent on the thermal history of the filter, and the other depends on the radiation history. The present paper presents experimental results on thermal effects; and it is shown that by a proper bake cycle, ZnS-cryolite filters are stable for years if stored at less than 38 degrees C.