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了解引起大连市本土新型冠状病毒肺炎(COVID-19)的新型冠状病毒(SARS-CoV-2)流行株的基因组特征和变异情况,追溯SARS-CoV-2来源。
选取2022年8月20日—9月14日97例由境外输入引起的COVID-19关联病例的样本。采用SARS-CoV-2全基因组靶向扩增结合高通量测序技术(Ion Torrent测序平台)进行全基因组测序。分析SARS-CoV-2的基因组特征、核苷酸和氨基酸突变位点和基因分型。构建进化树,结合病例的流行病学资料,溯源SARS-CoV-2流行株。
共获得97例SARS-CoV-2全基因组序列,基因组全长29 735~29 741 bp,平均测序深度1 457×~50 485×,测序覆盖率范围95.9%~100.0%。同NCBI数据库中的SARS-CoV-2参考基因组(NC_045512)序列相比,97例SARS-CoV-2全基因组序列共享75个核苷酸突变位点,22例在此基础上新增1~3个突变位点。75个共享突变位点类型包括:4个非编码区和7个基因编码区,其中基因编码区的70个突变位点,来自基因
此次SARS-CoV-2流行株属于Omicron变异株(BF.21进化分支),来源于日本。
2. Laboratory experiments, designed to elucidate differential survival under drought conditions, demonstrated that the organic cases of L. coenosus larvae held water more efficiently than did the mineral L. vittatus cases. Full-grown (fifth instar) L. coenosus larvae also survived dry conditions better than did L. vittatus larvae. The higher survival of L. coenosus was due to a combination of drought-resistant case material and a higher survival ability of the larvae themselves.
3. Limnephilus vittatus larvae were restricted by their low capability to withstand desiccation, although case material and food were available for L. vittatus larvae in all pools. Absence of case material and high-quality food in many pools, however, restricted the presence of L. coenosus larvae, but this species did not suffer from heavy mortality because of desiccation and all pool populations of L. coenosus survived until pupation.
4. The differences in species composition in these temporary and permanent pools can be explained by the differential site selection by ovipositing females, as well as by larval survival. The intrinsically greater survival of L. coenosus larvae during drought, together with the water-retaining properties of the cases, allowed this species to exploit stressful and risky habitats, such as temporary pools. 相似文献
- 1 Phytoplankton primary production and biomass were compared with bacterial secondary production estimated by means of frequency of dividing cells (FDC) in eutrophic Lake Tystrup. Denmark.
- 2 In the upper part of the photic zone, bacterial secondary production constituted 12% of the carbon fixed by the phytoplankton. In vertical profiles, bacterial secondary production ranged from 7.6% (early spring) to 121% (during August) of the carbon fixed by the algae.
- 3 A close relationship was found between occurrence and activity of bacteria and algae, suggesting that released organic products are of primary importance to the bacteria.
- 4 The annual phytoplankton primary production was estimated as 227 g C m-2 compared to 102 g C m-2 assimilated by the bacteria, so 45% of the carbon fixed by the phytoplankton went through pelagic bacteria.