Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,ar...Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,are still largely unknown,especially at the genome level,despite their importance in understanding the formation and outbreak of massive green tides.In the present study,the restriction site-associated DNA genotyping approach(2b-RAD)was adopted to identify the genome-wide single-nucleotide polymorphisms(SNPs)of 54 individual thalli including samples collected from Subei Shoal in 2019 and Qingdao coast from 2019 to 2021.SNPs genotype results revealed that most of the thalli in 2019 and 2020 were haploid gametophytes,while only half of the thalli were gametophytes in 2021,indicating flexibility in the reproductive strategies for the formation of the green tides among different years and the dominance of asexual and vegetative reproductive mode for the floating period.Besides,population analysis was conducted,and it revealed a very low genetic diversity among samples from Subei Shoal and the Qingdao coast in the same year and a higher divergence among samples in different years.The results showed the efficiency of 2b-RAD in the exploration of SNPs in U.prolifera and provided the first genome-wide scale evidence for the origin of the large-scale green tides on the Qingdao coast.This study improved our understanding of the reproductive strategy and genetic diversity of the green tide causative species and will help further reveal the biological causes of the green tide in China.展开更多
The neutron-induced total cross sections of natural lead have been measured in a wide energy range(0.3 eV-20 MeV)on the back-streaming white neutron beamline(Back-n)at the China Spallation Neutron Source.Neutron energ...The neutron-induced total cross sections of natural lead have been measured in a wide energy range(0.3 eV-20 MeV)on the back-streaming white neutron beamline(Back-n)at the China Spallation Neutron Source.Neutron energy was determined by the neutron total cross-section spectrometer using the time-of-flight technique.A fast multi-cell fission chamber was used as the neutron detector,and a 10-mm-thick high-purity natural lead sample was employed for the neutron transmission measurements.The on-beam background was determined using Co,In,Ag,and Cd filters.The excitation function of ^(nat)Pb(n,tot)reaction below 20 MeV was calculated using the TALYS-1.96 nuclear-reaction modeling program.The present results were compared with previous results,the evaluated data available in the five major evaluated nuclear data libraries(i.e.,ENDF/B-VIII.0,JEFF-3.3,JENDL-5,CENDL-3.2,and BROND-3.1),and the theoretical calculation curve.Good agreement was found between the new results and those of previous experiments and with the theoretical curves in the corresponding region.This measurement obtained the neutron total cross section of natural lead with good accuracy over a wide energy range and added experimental data in the resonance energy range.This provides more reliable experimental data for nuclear engineering design and nuclear data evaluation of lead.展开更多
目的 观察自噬在IL-1β促进INS-1胰岛β细胞凋亡中的作用。方法 体外培养大鼠INS-1胰岛β细胞株,给予不同浓度IL-1β干预,用CCK-8法检测在不同作用时间点INS-1细胞的存活率;用Western blot技术检测不同IL-1β浓度下自噬相关蛋白LC3、Bec...目的 观察自噬在IL-1β促进INS-1胰岛β细胞凋亡中的作用。方法 体外培养大鼠INS-1胰岛β细胞株,给予不同浓度IL-1β干预,用CCK-8法检测在不同作用时间点INS-1细胞的存活率;用Western blot技术检测不同IL-1β浓度下自噬相关蛋白LC3、Beclin1、P62的表达水平;Western blot法和流式细胞术检测INS-1细胞的凋亡水平。结果 IL-1β可以降低INS-1细胞的存活率,且呈浓度及时间依赖性( P <0.05, P <0.01)。与对照组相比,随着IL-1β浓度的增高,INS-1细胞凋亡水平逐渐升高( P <0.05),且细胞自噬水平也随着IL-1β浓度的增高而逐渐增高(自噬相关蛋白LC3、Beclin1表达上升,P62降低, P <0.05)。采用自噬激动剂雷帕霉素预处理细胞上调自噬可进一步增加IL-1β诱导的细胞凋亡,而用自噬抑制剂3-MA预处理抑制细胞自噬后则可逆转IL-1β诱导的INS-1胰岛细胞凋亡。结论 IL-1β通过诱导自噬增加促进INS-1胰岛β细胞凋亡。展开更多
基金Supported by the Laoshan Laboratory (No.LSKJ202204005)the Mount Tai Scholar Climbing Plan to Song SUNthe Open Fund of CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences (No.KLMEES201801)
文摘Ulva prolifera is the causative species of the annually occurring large-scale green tides in China since 2007.Its specific biological features on reproductivity strategies,as well as intra-species genetic diversity,are still largely unknown,especially at the genome level,despite their importance in understanding the formation and outbreak of massive green tides.In the present study,the restriction site-associated DNA genotyping approach(2b-RAD)was adopted to identify the genome-wide single-nucleotide polymorphisms(SNPs)of 54 individual thalli including samples collected from Subei Shoal in 2019 and Qingdao coast from 2019 to 2021.SNPs genotype results revealed that most of the thalli in 2019 and 2020 were haploid gametophytes,while only half of the thalli were gametophytes in 2021,indicating flexibility in the reproductive strategies for the formation of the green tides among different years and the dominance of asexual and vegetative reproductive mode for the floating period.Besides,population analysis was conducted,and it revealed a very low genetic diversity among samples from Subei Shoal and the Qingdao coast in the same year and a higher divergence among samples in different years.The results showed the efficiency of 2b-RAD in the exploration of SNPs in U.prolifera and provided the first genome-wide scale evidence for the origin of the large-scale green tides on the Qingdao coast.This study improved our understanding of the reproductive strategy and genetic diversity of the green tide causative species and will help further reveal the biological causes of the green tide in China.
基金This work is supported by the National Natural Science Foundation of China(No.12375296)the Key Laboratory of Nuclear Data Foundation(No.JCKY2022201C153)+2 种基金the Natural Science Foundation of Hunan Province of China(Nos.2021JJ40444,2020RC3054)the Youth Innovation Promotion Association CAS(No.2023014)the National Key Research and Development Plan(No.2022YFA1603303).
文摘The neutron-induced total cross sections of natural lead have been measured in a wide energy range(0.3 eV-20 MeV)on the back-streaming white neutron beamline(Back-n)at the China Spallation Neutron Source.Neutron energy was determined by the neutron total cross-section spectrometer using the time-of-flight technique.A fast multi-cell fission chamber was used as the neutron detector,and a 10-mm-thick high-purity natural lead sample was employed for the neutron transmission measurements.The on-beam background was determined using Co,In,Ag,and Cd filters.The excitation function of ^(nat)Pb(n,tot)reaction below 20 MeV was calculated using the TALYS-1.96 nuclear-reaction modeling program.The present results were compared with previous results,the evaluated data available in the five major evaluated nuclear data libraries(i.e.,ENDF/B-VIII.0,JEFF-3.3,JENDL-5,CENDL-3.2,and BROND-3.1),and the theoretical calculation curve.Good agreement was found between the new results and those of previous experiments and with the theoretical curves in the corresponding region.This measurement obtained the neutron total cross section of natural lead with good accuracy over a wide energy range and added experimental data in the resonance energy range.This provides more reliable experimental data for nuclear engineering design and nuclear data evaluation of lead.
文摘目的 观察自噬在IL-1β促进INS-1胰岛β细胞凋亡中的作用。方法 体外培养大鼠INS-1胰岛β细胞株,给予不同浓度IL-1β干预,用CCK-8法检测在不同作用时间点INS-1细胞的存活率;用Western blot技术检测不同IL-1β浓度下自噬相关蛋白LC3、Beclin1、P62的表达水平;Western blot法和流式细胞术检测INS-1细胞的凋亡水平。结果 IL-1β可以降低INS-1细胞的存活率,且呈浓度及时间依赖性( P <0.05, P <0.01)。与对照组相比,随着IL-1β浓度的增高,INS-1细胞凋亡水平逐渐升高( P <0.05),且细胞自噬水平也随着IL-1β浓度的增高而逐渐增高(自噬相关蛋白LC3、Beclin1表达上升,P62降低, P <0.05)。采用自噬激动剂雷帕霉素预处理细胞上调自噬可进一步增加IL-1β诱导的细胞凋亡,而用自噬抑制剂3-MA预处理抑制细胞自噬后则可逆转IL-1β诱导的INS-1胰岛细胞凋亡。结论 IL-1β通过诱导自噬增加促进INS-1胰岛β细胞凋亡。
