The reported X-ray structure and magnetochemical properties of [Mn6O2 (OCPh)10, (CH3CN)4], effectively derived from [NBu4][Mn4O2(O2CPh)9 (H2O)] with equivalent of tren in CH3CN is shown.
Species are not only the fundamental units of taxonomy but also the basic units of pest management.Insects of Conogethes are important agricultural and forestry pests.However,species boundaries within Conogethes often...Species are not only the fundamental units of taxonomy but also the basic units of pest management.Insects of Conogethes are important agricultural and forestry pests.However,species boundaries within Conogethes often appear obscure.In the present study,we reevaluated the species status of Conogethes by applying three species delimitation approaches based on the mitochondrial DNA sequences,with particular emphasis on the yellow peach moth C.punctiferalis(Guenée,1854).We first optimized species delimitation and inter-species genetic divergence threshold using a DNA barcoding dataset.The results revealed that several nominal species of Conogethes species harbored deeply diverged mitochondrial lineages which were recognized as independent species by the species delimitation methods.The p-distance between the delimited putative species ranged from 0.0159 to 0.1321 with a mean of 0.0841.Then we refined the species status of C.punctiferalis using the smallest interspecific distance threshold based on a geographically comprehensive population-scale dataset.This procedure narrowed the species concept of C.punctiferalis to a genetically coherent unit.Further investigation of its intraspecific divergence in the geographic context revealed that the refined C.punctiferalis was still widely distributed with the same or highly similar mitochondrial haplotypes occurring across South and East Asia.展开更多
A phytochemical investigation of the whole plant of Parasenecio rubescens(S.Moore)Y.L.Chen yielded 14 previ-ously undescribed,highly oxidized bisabolane-type sesquiterpenoids,named pararunines L-Y,along with one known...A phytochemical investigation of the whole plant of Parasenecio rubescens(S.Moore)Y.L.Chen yielded 14 previ-ously undescribed,highly oxidized bisabolane-type sesquiterpenoids,named pararunines L-Y,along with one known oplopane-type sesquiterpenoid.The structural elucidation of these compounds was accomplished through comprehensive spectroscopic analysis,in-cluding nuclear magnetic resonance(NMR)and high-resolution electrospray ionization mass spectrometry(HR-ESI-MS)techniques.Motivated by traditional uses and previous studies on this genus,all isolated compounds were subjected to in vitro cytotoxicity assays against four human cancer cell lines(MCF-7,Hela,HCT116,and HT-29).Considering that the reported chemical constituents of nu-merous other species within this genus primarily consist of eremophilane-type sesquiterpenoids,our findings not only expand the struc-tural diversity of bisabolane-type sesquiterpenoids but also contribute valuable scientific evidence to the chemotaxonomy of this genus.展开更多
文摘The reported X-ray structure and magnetochemical properties of [Mn6O2 (OCPh)10, (CH3CN)4], effectively derived from [NBu4][Mn4O2(O2CPh)9 (H2O)] with equivalent of tren in CH3CN is shown.
基金This study was supported by a starting fund from Hebei Agricultural University and the State Key Laboratory of North China Crop Improvement and Regulation(YJ2020028).
文摘Species are not only the fundamental units of taxonomy but also the basic units of pest management.Insects of Conogethes are important agricultural and forestry pests.However,species boundaries within Conogethes often appear obscure.In the present study,we reevaluated the species status of Conogethes by applying three species delimitation approaches based on the mitochondrial DNA sequences,with particular emphasis on the yellow peach moth C.punctiferalis(Guenée,1854).We first optimized species delimitation and inter-species genetic divergence threshold using a DNA barcoding dataset.The results revealed that several nominal species of Conogethes species harbored deeply diverged mitochondrial lineages which were recognized as independent species by the species delimitation methods.The p-distance between the delimited putative species ranged from 0.0159 to 0.1321 with a mean of 0.0841.Then we refined the species status of C.punctiferalis using the smallest interspecific distance threshold based on a geographically comprehensive population-scale dataset.This procedure narrowed the species concept of C.punctiferalis to a genetically coherent unit.Further investigation of its intraspecific divergence in the geographic context revealed that the refined C.punctiferalis was still widely distributed with the same or highly similar mitochondrial haplotypes occurring across South and East Asia.
基金supported by the National Natural Science Foundation of China(Nos.22077041,81803847 and 31770380).
文摘A phytochemical investigation of the whole plant of Parasenecio rubescens(S.Moore)Y.L.Chen yielded 14 previ-ously undescribed,highly oxidized bisabolane-type sesquiterpenoids,named pararunines L-Y,along with one known oplopane-type sesquiterpenoid.The structural elucidation of these compounds was accomplished through comprehensive spectroscopic analysis,in-cluding nuclear magnetic resonance(NMR)and high-resolution electrospray ionization mass spectrometry(HR-ESI-MS)techniques.Motivated by traditional uses and previous studies on this genus,all isolated compounds were subjected to in vitro cytotoxicity assays against four human cancer cell lines(MCF-7,Hela,HCT116,and HT-29).Considering that the reported chemical constituents of nu-merous other species within this genus primarily consist of eremophilane-type sesquiterpenoids,our findings not only expand the struc-tural diversity of bisabolane-type sesquiterpenoids but also contribute valuable scientific evidence to the chemotaxonomy of this genus.
