The buoyancy of Artemia resting eggs is a feature with both biological and economic importance.Since the buoyancy of resting eggs is dependent on the specific weight of the eggs or salinity of ambient water,we suppose...The buoyancy of Artemia resting eggs is a feature with both biological and economic importance.Since the buoyancy of resting eggs is dependent on the specific weight of the eggs or salinity of ambient water,we suppose that habitat salinity may exert a selection pressure on resting egg buoyancy,and thereby lower habitat salinity may result in better floating capacity of resting eggs and vice versa.In this study,we compared the floating capacity of resting eggs from 25 Artemia populations.The results showed that the floating capacity of resting eggs varied greatly among different populations.The minimum salinity to float some eggs varied from 0 to 180.The salinity at which all resting eggs floated varied from 80 to 320.The FS_(50)(salinity with 50%eggs floating)of Zhundong and Yuncheng population was not detectable(over 50%eggs floating in distilled water),that of Kyêbxang Co population was 4.3,while the maximum value found in Dabancheng population was 234.5.In terms of the‘apparent specific weight’of resting eggs,18 populations exhibited a single-peak distribution pattern,while the other 7 populations showed a multiple-peak or non-peak distribution.Negative correlations were found between FS50 and chorion thickness,and between FS_(50) and the volume percentage of the chorion in eggs,supporting a previous standpoint that shell thickness was a determinative factor for the floating capacity of resting eggs.A positive correlation was determined between FS50 and habitat salinity.The hypothesis that habitat salinity may cause a directional selection on the buoyancy of resting eggs seems to be true.展开更多
目的系统评价γ干扰素释放试验、核酸检测试验、结核抗体检测试验3种方法用于泌尿生殖系统结核的诊断价值。方法检索PubMed、Embase、Web of science、Clarivate、知网、万方、维普电子数据库从建库到2023年1月关于诊断泌尿生殖系统结...目的系统评价γ干扰素释放试验、核酸检测试验、结核抗体检测试验3种方法用于泌尿生殖系统结核的诊断价值。方法检索PubMed、Embase、Web of science、Clarivate、知网、万方、维普电子数据库从建库到2023年1月关于诊断泌尿生殖系统结核方法的相关文献,提取文献数据,采用Stata 16、Meta-Disc 1.4和RevMan 5.4软件进行数据分析和质量评估。结果最终纳入的32篇相关文献的分析结果显示:对于合并敏感度、合并特异度、合并阳性似然比、合并阴性似然比、合并诊断比值比、综合受试者操作特征曲线下面积,γ干扰素释放试验分别为0.84,0.77,3.58,0.23,17.95,0.89;核酸检测试验分别为0.65,0.94,7.57,0.29,38.50,0.92;结核抗体检测试验分别为0.66,0.90,5.54,0.37,17.68,0.82。根据sROC曲线下面积排序、Fagan列线图、似然比图和概率修正图,核酸检测试验的诊断准确性和临床诊断价值最高。同时使用回归分析了3种方法异质性的来源。结论核酸检测试验对于泌尿生殖系统结核具有更高的诊断价值,可以用于提高临床对泌尿生殖系统结核的诊断准确性。展开更多
基金supported by the Science and Technology Project of Tibet Autonomous Region(Nos.XZ201703-GB-04,XZ202102YD0022C)the Science and Technology Project of Zhejiang Province(No.2020C26008).
文摘The buoyancy of Artemia resting eggs is a feature with both biological and economic importance.Since the buoyancy of resting eggs is dependent on the specific weight of the eggs or salinity of ambient water,we suppose that habitat salinity may exert a selection pressure on resting egg buoyancy,and thereby lower habitat salinity may result in better floating capacity of resting eggs and vice versa.In this study,we compared the floating capacity of resting eggs from 25 Artemia populations.The results showed that the floating capacity of resting eggs varied greatly among different populations.The minimum salinity to float some eggs varied from 0 to 180.The salinity at which all resting eggs floated varied from 80 to 320.The FS_(50)(salinity with 50%eggs floating)of Zhundong and Yuncheng population was not detectable(over 50%eggs floating in distilled water),that of Kyêbxang Co population was 4.3,while the maximum value found in Dabancheng population was 234.5.In terms of the‘apparent specific weight’of resting eggs,18 populations exhibited a single-peak distribution pattern,while the other 7 populations showed a multiple-peak or non-peak distribution.Negative correlations were found between FS50 and chorion thickness,and between FS_(50) and the volume percentage of the chorion in eggs,supporting a previous standpoint that shell thickness was a determinative factor for the floating capacity of resting eggs.A positive correlation was determined between FS50 and habitat salinity.The hypothesis that habitat salinity may cause a directional selection on the buoyancy of resting eggs seems to be true.
