【目的】掌握骨唇黄河鱼(Chuanchia labiosa)其野生种质资源现状,了解其系统发育关系和进化状况。【方法】对野外采样的106尾骨唇黄河鱼进行mt DNA Cytb,COX1和D-Loop基因多样性对比。【结果】结果表明9个裂腹鱼亚科群体系统发育进化树...【目的】掌握骨唇黄河鱼(Chuanchia labiosa)其野生种质资源现状,了解其系统发育关系和进化状况。【方法】对野外采样的106尾骨唇黄河鱼进行mt DNA Cytb,COX1和D-Loop基因多样性对比。【结果】结果表明9个裂腹鱼亚科群体系统发育进化树分为3大支,Network与系统发育树结果基本一致。骨唇黄河鱼Tajima’sD和Fu’sFs检验及错配分布分析均表明其经历过种群扩张,不同种群分离的时间可能与青藏高原地质运动有关。【结论】骨唇黄河鱼的遗传多样性相对较低,呈高单倍型多样度和低核苷酸多样度的特点。展开更多
Vibration-induced bias deviation,which is generated by intensity fluctuations and additional phase differences,is one of the vital errors for fiber optic gyroscopes(FOGs)operating in vibration environment and has seve...Vibration-induced bias deviation,which is generated by intensity fluctuations and additional phase differences,is one of the vital errors for fiber optic gyroscopes(FOGs)operating in vibration environment and has severely restricted the applications of high-precision FOGs.The conventional methods for suppressing vibration-induced errors mostly concentrate on reinforcing the mechanical structure and optical path as well as the compensation under some specific operation parameters,which have very limited effects for high-precision FOGs maintaining performances under vibration.In this work,a technique of suppressing the vibration-induced bias deviation through removing the part related to the varying gain from the rotation-rate output is put forward.Particularly,the loop gain is extracted out by adding a gain-monitoring wave.By demodulating the loop gain and the rotation rate simultaneously under distinct frequencies and investigating their quantitative relationship,the vibrationinduced bias error is compensated without limiting the operating parameters or environments,like the applied modulation depth.The experimental results show that the proposed method has achieved the reduction of bias error from about 0.149°/h to0.014°/h during the random vibration with frequencies from20 Hz to 2000 Hz.This technique provides a feasible route for enhancing the performances of high-precision FOGs heading towards high environmental adaptability.展开更多
文摘【目的】掌握骨唇黄河鱼(Chuanchia labiosa)其野生种质资源现状,了解其系统发育关系和进化状况。【方法】对野外采样的106尾骨唇黄河鱼进行mt DNA Cytb,COX1和D-Loop基因多样性对比。【结果】结果表明9个裂腹鱼亚科群体系统发育进化树分为3大支,Network与系统发育树结果基本一致。骨唇黄河鱼Tajima’sD和Fu’sFs检验及错配分布分析均表明其经历过种群扩张,不同种群分离的时间可能与青藏高原地质运动有关。【结论】骨唇黄河鱼的遗传多样性相对较低,呈高单倍型多样度和低核苷酸多样度的特点。
基金Fundamental Research Funds for the Central Universities(YWF-23-L-1225)National Natural Science Foundation of China(62201025)Chinese Aeronautical Establishment(2022Z037051001)。
文摘Vibration-induced bias deviation,which is generated by intensity fluctuations and additional phase differences,is one of the vital errors for fiber optic gyroscopes(FOGs)operating in vibration environment and has severely restricted the applications of high-precision FOGs.The conventional methods for suppressing vibration-induced errors mostly concentrate on reinforcing the mechanical structure and optical path as well as the compensation under some specific operation parameters,which have very limited effects for high-precision FOGs maintaining performances under vibration.In this work,a technique of suppressing the vibration-induced bias deviation through removing the part related to the varying gain from the rotation-rate output is put forward.Particularly,the loop gain is extracted out by adding a gain-monitoring wave.By demodulating the loop gain and the rotation rate simultaneously under distinct frequencies and investigating their quantitative relationship,the vibrationinduced bias error is compensated without limiting the operating parameters or environments,like the applied modulation depth.The experimental results show that the proposed method has achieved the reduction of bias error from about 0.149°/h to0.014°/h during the random vibration with frequencies from20 Hz to 2000 Hz.This technique provides a feasible route for enhancing the performances of high-precision FOGs heading towards high environmental adaptability.
文摘对浙江瑞安、福建宁德、福建东张水库3个地理群体共31例香鱼(Plecoglossus altivelis)的线粒体细胞色素b(Cyt b)基因和线粒体D-loop区序列进行了PCR扩增、序列测定、核苷酸组成和多态性分析。Cytb基因中,A、T、C和G4种核苷酸的比例分别为19.72%、29.71%、32.25%和18.32%,A+T含量为49.43%,G+C含量为50.57%。D-loop区序列中,A、T、C和G4种核苷酸的比例分别为29.99%、29.29%、23.80%和16.92%,A+T含量为59.28%,G+C含量为40.72%。在长度为1141bp的Cytb基因序列中,仅存在1个变异位点,核苷酸多样性指数(π值)为0.00028,31个样本中仅出现两种单倍型;857 bp 长的D-loop区序列中,仅存在5个变异位点,核苷酸多样性指数(π值)为0.00199,仅出现5种单倍型。这表明闽浙地区香鱼的遗传多样性水平很低,应当加大对香鱼的保护力度。
