齿石

The efficient and economical tool enzymes for isolating protoplasts of Porphyra yezoensis from the digestive glands of four shellfish (Monodonta labia, Chlorostoma rusticum, Littorina brevicula, Acanthochiton rubrolineatus), cellulase and pectinase from internal market were studied.

通过比较自制的4种海螺酶（分别取自单齿螺、锈凹螺、短滨螺和石鳖）及国产的纤维素酶、果胶酶等对条斑紫菜细胞壁的降解效果，探索经济高效制备条斑紫菜原生质体的工具酶，并进一步研究了最佳酶解条件。

Some limpets have home scars, which are visible marks on the rock surface in the

它们用壳下的肉足在岩石上走动，并以齿舌刮食石上的

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。