We present the results of our study of the long-period eclipsing binary star V454 Aur.The results are based on spectroscopic data obtained with the UFESéchelle spectrograph and photometric observations from Trans...We present the results of our study of the long-period eclipsing binary star V454 Aur.The results are based on spectroscopic data obtained with the UFESéchelle spectrograph and photometric observations from Transiting Exoplanet Survey Satellite(TESS).The derived radial velocity curve is based on 17 spectra obtained between 2021and 2023,covering all orbital phases of this binary system.The orbital period determined from TESS data,P=27.019803±0.000003 days,agrees within uncertainties with the period established in previous studies.The model constructed for the TESS photometric light curve achieves a precision of 0.01%.The effective temperatures of both components,as well as the system metallicity,were directly derived from the spectra and are Teff,A=6250±50 K,Teff,B=5855±50 K,and[Fe/H]=-0.10±0.08,respectively.Our analysis of the photometric and spectroscopic data allowed us to directly compute the luminosities of the components,LA=1.82 L☉and LB=1.07 L☉,their radii,RA=1.15 R☉and RB=1.00 R☉,and their masses,MA=1.137 M☉and MB=1.023 M☉,with uncertainties below 1%.Comparison with evolutionary tracks indicates that the system’s age is 1.18±0.10 Gyr,and both components are still on the main sequence.The V454 Aur system is particularly interesting due to the partial eclipse of the primary component,which results in the“inversion”of the primary and secondary minima in the photometric light curve.展开更多
目的阐明非酒精性脂肪性肝病（NAFLD）患者肠道菌群结构特征。方法采用454焦磷酸测序技术,对47例经＂肝活检＂确诊的NAFLD患者和34例健康人新鲜粪便样品16S DNA V3-V5可变区进行测序,通过序列比较及操作分类单元（OTU）划分评价肠道菌...目的阐明非酒精性脂肪性肝病（NAFLD）患者肠道菌群结构特征。方法采用454焦磷酸测序技术,对47例经＂肝活检＂确诊的NAFLD患者和34例健康人新鲜粪便样品16S DNA V3-V5可变区进行测序,通过序列比较及操作分类单元（OTU）划分评价肠道菌群结构差异。结果 NAFLD患者OTUs为（88.32±28.27）,显著低于健康人[（109.65±30.65）,P〈0.01];在＂门＂水平,NAFLD患者厚壁菌门所占比例为（51.2±17.8）%,显著高于健康人的[（46.4±12.8）%,P=0.048],而拟杆菌门为（31.6±18.9）%,显著低于健康人的[（43.3±14.4）%,P〈0.001];在＂纲＂水平上,NAFLD组Erysipelotrichi纲占（3.2±5.1）%,显著高于健康人的[（1.0±1.2）%,P=0.009],而Bacteroidia纲占（31.0±18.8）%,显著低于对照组的[（42.3±14.0）%,P=0.004];在＂属＂水平上,NAFLD组乳球菌占（0.0038±0.0001）%,低于健康组的[（0.0145±0.001）%,P=0.003],普氏菌属也同样显著减少（P=0.022）,而链球菌（Streptococcus）在NAFLD占（1.50±0.03）%,显著高于对照组的[（0.21±0.24）%,P=0.004]。结论 NAFLD患者肠道菌群多样性减少,存在构成显著异常,是致病因素抑或其后果仍有待于进一步研究。展开更多
基金support from the National Research Foundation(NRF)of South Africasupported by the Ministry of Science and Higher Education of Russia,topic No.FEUZ-2023-0019。
文摘We present the results of our study of the long-period eclipsing binary star V454 Aur.The results are based on spectroscopic data obtained with the UFESéchelle spectrograph and photometric observations from Transiting Exoplanet Survey Satellite(TESS).The derived radial velocity curve is based on 17 spectra obtained between 2021and 2023,covering all orbital phases of this binary system.The orbital period determined from TESS data,P=27.019803±0.000003 days,agrees within uncertainties with the period established in previous studies.The model constructed for the TESS photometric light curve achieves a precision of 0.01%.The effective temperatures of both components,as well as the system metallicity,were directly derived from the spectra and are Teff,A=6250±50 K,Teff,B=5855±50 K,and[Fe/H]=-0.10±0.08,respectively.Our analysis of the photometric and spectroscopic data allowed us to directly compute the luminosities of the components,LA=1.82 L☉and LB=1.07 L☉,their radii,RA=1.15 R☉and RB=1.00 R☉,and their masses,MA=1.137 M☉and MB=1.023 M☉,with uncertainties below 1%.Comparison with evolutionary tracks indicates that the system’s age is 1.18±0.10 Gyr,and both components are still on the main sequence.The V454 Aur system is particularly interesting due to the partial eclipse of the primary component,which results in the“inversion”of the primary and secondary minima in the photometric light curve.
文摘目的阐明非酒精性脂肪性肝病（NAFLD）患者肠道菌群结构特征。方法采用454焦磷酸测序技术,对47例经＂肝活检＂确诊的NAFLD患者和34例健康人新鲜粪便样品16S DNA V3-V5可变区进行测序,通过序列比较及操作分类单元（OTU）划分评价肠道菌群结构差异。结果 NAFLD患者OTUs为（88.32±28.27）,显著低于健康人[（109.65±30.65）,P〈0.01];在＂门＂水平,NAFLD患者厚壁菌门所占比例为（51.2±17.8）%,显著高于健康人的[（46.4±12.8）%,P=0.048],而拟杆菌门为（31.6±18.9）%,显著低于健康人的[（43.3±14.4）%,P〈0.001];在＂纲＂水平上,NAFLD组Erysipelotrichi纲占（3.2±5.1）%,显著高于健康人的[（1.0±1.2）%,P=0.009],而Bacteroidia纲占（31.0±18.8）%,显著低于对照组的[（42.3±14.0）%,P=0.004];在＂属＂水平上,NAFLD组乳球菌占（0.0038±0.0001）%,低于健康组的[（0.0145±0.001）%,P=0.003],普氏菌属也同样显著减少（P=0.022）,而链球菌（Streptococcus）在NAFLD占（1.50±0.03）%,显著高于对照组的[（0.21±0.24）%,P=0.004]。结论 NAFLD患者肠道菌群多样性减少,存在构成显著异常,是致病因素抑或其后果仍有待于进一步研究。
