Proso millet (Panicum miliaceum) is a more minor crop than foxtail, finger and pearl millets, but it is grown for humanconsumptionin someAsian and African countries. Recently, we have reported that the nutritional quality of proso millet protein is poor but the quality can be greatly improved by supplementing with lysine and threonine.M any studies have shown that vegetable proteins, es
We have investigated elastic properties of the Ce-based filled skutterudite antimonides CeRu 4 Sb 12 and CeOs 4 Sb 12 by means of ultrasonic measurements. CeRu 4 Sb 12 shows a slight increase around 130 K in the temperature dependence of the elastic constants C 11 , ͑C 11 − C 12 ͒ / 2, and C 44 . No apparent lattice softening toward low temperature expected by a quadrupolar response of the 4f-electronic ground state of the Ce ion was observed at low temperatures. On the other hand, CeOs 4 Sb 12 shows a pronounced lattice softening toward low temperature in the longitudinal C 11 as a function of temperature below about 15 K, while a slight lattice softening was observed in the transverse C 44 below about 1.5 K, in contrast to no softening in CeRu 4 Sb 12 at low temperatures. Furthermore, CeOs 4 Sb 12 shows a steep drop around a phase-transition temperature of T s = 0.9 K in both C 11 and C 44 . The lattice softening observed in C 11 below about 15 K cannot be explained reasonably only by the crystalline electric-field ͑CEF͒ effect. Instead, it is most likely to be responsible for a coupling between elastic strain and a relevant renormalized quasiparticle band with a small energy gap in the vicinity of the Fermi level. The elastic properties and the 4f ground state of Ce ions in CeRu 4 Sb 12 and CeOs 4 Sb 12 are discussed in terms of the CEF effect and the band structure in the vicinity of Fermi level.
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