| 1. | The other two, thymine and cytosine, are single ring structures called pyrimidines .
另两个为胸腺嘧啶和胞嘧啶，即称为嘧啶的单环结构。 |
| 2. | In dna, four different bases are found. two of these, adenine and guanine, are double-ring structures called purines .
在DNA中，有四种不同的基，其中的两个为腺嘌呤和鸟嘌呤，即称为嘌呤的双环结构。 |
| 3. | In dna, four different bases are found. two of these, adenine and guanine, are double-ring structures called purines .
在DNA中，有四种不同的碱基，其中的两个为腺嘌呤和鸟嘌呤，即称为嘌呤的双环结构。 |
| 4. | Observation of chromosome structure in allium cepa
洋葱染色体螺旋与放射环结构的电镜观察 |
| 5. | Dna specific staining ; namaur method ; chromosome structure ; allium cepa
Dna特异染色nama - ur方法放射环结构洋葱染色体 |
| 6. | Observation of chromosome structure in allium cepa cells by means of electron microscopy
洋葱染色体螺旋与放射环结构的电镜观察 |
| 7. | The shape of the magnetic field is similar to the shape of the double - loop - model proposed by us
磁力线的这种位形与双环结构符合得较好。 |
| 8. | Analysis of gas temperature radial distribution in neh2cubr laser discharge tube with diaphragms
隔环结构的neh2cubr激光放电管气体温度径向分布 |
| 9. | The resulting 30 - membered ring structure produces an oval projection when viewed parallel to the b axis
沿平行于b轴的方向上生成了一个奇特的30元环结构。 |
| 10. | Type synthesis and topological description of spatial parallel mechanisms based on five - bar closed - loop structure
基于平面五杆闭环结构的空间并联机构类型综合与拓扑分析 |
