oval surface
1.Some of the sporidia appear kidney form or long oval shaped, and smooth at the surface, the size is 2.4 μm×1.2 μm, and the ratio of length to width is 2.0. By the areificial infection experiment, we understood the process of the development of chalkbrood and the day age when a bee barva is most likely to be infected.
2.The noduli valvulae semilunaris,ossa cordis,oval foramen and trabeculae carneae were odserved and measurvd in 47 adult Yaks,5 cattlein age ranged from 1～1.5 years old and 35 adult Tibetan-sheep. The thickness of the ventricular walls,internal carcumference of the atrioventricular orifices and arteral orifices,some anatomical items of the surface of the heart and thickness of the oval membrane ect weredetermined in the paper.
