Endo-dicyclopentadiene was isomerized to exo-isomer by thermal treatment at evaluated temperature and pressure. The reaction temperature and pressure are key factors for this novel isomerization. This result may have ...Endo-dicyclopentadiene was isomerized to exo-isomer by thermal treatment at evaluated temperature and pressure. The reaction temperature and pressure are key factors for this novel isomerization. This result may have great potential for practical application.展开更多
The present study is expected to provide better understanding of how exo-β-glucanase acts on the biochemo-rheological property of the cell wall, and thus the regulation mechanism of pollen tube growth. A polymerase c...The present study is expected to provide better understanding of how exo-β-glucanase acts on the biochemo-rheological property of the cell wall, and thus the regulation mechanism of pollen tube growth. A polymerase chain reaction （PCR）-based strategy and cDNA library screening were used to clone an exo-β-glucanase gene （LP-Exol） from Lilium Iongiflorum pollen tubes. The LP-Exol sequence showed a high level of homology to that of reported plant exo-β-glucan hydrolases. Phylogenetic analysis demonstrated that there was close relationship between LP-Exol and other exo-glucan hydrolases in Poacea plants. Northern analysis indicated that LP-Exol transcripts stored in pollen grains at low levels; LP-Exol transcription level enhanced at 2 h after the onset of pollen incubation and remained relatively high during pollen tube elongation. Moreover, the expression of LP-Exol was undetectable in petals, filaments, stigmas, styles, ovaries, leaves, and stems. These results suggest that LP-Exol gene is a late pollen gene, specifically contributing to the regulation of lily pollen germination and pollen tube growth.展开更多
A new search for two-neutrino double-beta(2νββ)decay of^(136)Xe to the 0+1 excited state of 136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminat...A new search for two-neutrino double-beta(2νββ)decay of^(136)Xe to the 0+1 excited state of 136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background events.Signal detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of two.With the addition of the Phase II dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2νββdecay to the 0+1 state of 136Ba is 2.9×10^(24)yr using a total^(136)Xe exposure of 234.1 kg yr.No statistically significant evidence for 2νββdecay to the 0^(+)_(1)state is observed,leading to a lower limit of T2ν1/2(0^(+)→0^(+)_(1))>1.4×10^(24)yr at 90%confidence level,improved by 70%relative to the current world's best constraint.展开更多
文摘Endo-dicyclopentadiene was isomerized to exo-isomer by thermal treatment at evaluated temperature and pressure. The reaction temperature and pressure are key factors for this novel isomerization. This result may have great potential for practical application.
基金Supported by the National Natural Science Foundation of China (No. 30170090) and partially financed as a Joint Research Program by the Japanese Society for the Promotion of Science and the National Natural Science Foundation of China
文摘The present study is expected to provide better understanding of how exo-β-glucanase acts on the biochemo-rheological property of the cell wall, and thus the regulation mechanism of pollen tube growth. A polymerase chain reaction （PCR）-based strategy and cDNA library screening were used to clone an exo-β-glucanase gene （LP-Exol） from Lilium Iongiflorum pollen tubes. The LP-Exol sequence showed a high level of homology to that of reported plant exo-β-glucan hydrolases. Phylogenetic analysis demonstrated that there was close relationship between LP-Exol and other exo-glucan hydrolases in Poacea plants. Northern analysis indicated that LP-Exol transcripts stored in pollen grains at low levels; LP-Exol transcription level enhanced at 2 h after the onset of pollen incubation and remained relatively high during pollen tube elongation. Moreover, the expression of LP-Exol was undetectable in petals, filaments, stigmas, styles, ovaries, leaves, and stems. These results suggest that LP-Exol gene is a late pollen gene, specifically contributing to the regulation of lily pollen germination and pollen tube growth.
文摘A new search for two-neutrino double-beta(2νββ)decay of^(136)Xe to the 0+1 excited state of 136Ba is performed with the full EXO-200 dataset.A deep learning-based convolutional neural network is used to discriminate signal from background events.Signal detection efficiency is increased relative to previous searches by EXO-200 by more than a factor of two.With the addition of the Phase II dataset taken with an upgraded detector,the median 90%confidence level half-life sensitivity of 2νββdecay to the 0+1 state of 136Ba is 2.9×10^(24)yr using a total^(136)Xe exposure of 234.1 kg yr.No statistically significant evidence for 2νββdecay to the 0^(+)_(1)state is observed,leading to a lower limit of T2ν1/2(0^(+)→0^(+)_(1))>1.4×10^(24)yr at 90%confidence level,improved by 70%relative to the current world's best constraint.
