本文描述了贵州剑河八郎寒武系第二统第四阶"清虚洞组"剑河生物群的高肌虫化石。化石壳体呈圆形,背边平直,前、后背角均钝,壳前背部具有"V"形槽。符合Qingquanella Cui et Huo,1985的属征,与模式种湖北清泉虫Q.hube...本文描述了贵州剑河八郎寒武系第二统第四阶"清虚洞组"剑河生物群的高肌虫化石。化石壳体呈圆形,背边平直,前、后背角均钝,壳前背部具有"V"形槽。符合Qingquanella Cui et Huo,1985的属征,与模式种湖北清泉虫Q.hubeiensis相似,将其厘定为湖北清泉虫相似种Q.cf.hubeiensis。本属产于湖北水井沱组、石牌组及陕西辛集组,黔东地区"清虚洞组"发现清泉虫Qingquanella,增加了清泉虫的产地信息、新的类群,其壳体形态由切卵变圆形,生态环境由浅水向深水变化,为高肌虫的形态分类、早期演化与辐射分异提供新的材料。展开更多
The electronic singlet vertical excited states of photosynthetic reaction center(PSRC)in Rhodopseudomonas(Rps.)viridis were investigated by ZINDO and INDO/S methods.The effects of the interactions of pigment-pigment a...The electronic singlet vertical excited states of photosynthetic reaction center(PSRC)in Rhodopseudomonas(Rps.)viridis were investigated by ZINDO and INDO/S methods.The effects of the interactions of pigment-pigment and pigment-protein on the electronic excitations were examined.The calculation results showed that the interactions of pigment-pigment and pigment-protein play an important role in reasonably assigning the experimental absorption and circular dichroism(CD)spec-tra of PSRC in Rps.virids.By comparing the theoretically computed excited states with the experi-mental absorption and CD spectra,satisfactory assignments of the experimental spectroscopic peaks were achieved.展开更多
To improve the performance of traditional nucle-ation additives and their compatibility with other additives,as well as to solve complex problems in practical applications,SiO_(2) precursors were reactively grafted in...To improve the performance of traditional nucle-ation additives and their compatibility with other additives,as well as to solve complex problems in practical applications,SiO_(2) precursors were reactively grafted in situ with the sym-metrical hydroxyl groups of the nucleation agents.With this approach,the dissymmetrical part of the nucleation agents plays an important role.As a result,the prepared composite additive—the nanoparticle precursor(NPP0)—produces excellent results.The NPP0-PP composite has a transparency of over 93%,haze lower than 15%,and a heat distortion temperature(HDT)of 142℃,which is more than the 110℃ of the pure PP matrix.In addition,it maintains over 90%of the mechanical properties with a deformation coefficient less than 1%.This indicates a strong nanoeffect.展开更多
文摘本文描述了贵州剑河八郎寒武系第二统第四阶"清虚洞组"剑河生物群的高肌虫化石。化石壳体呈圆形,背边平直,前、后背角均钝,壳前背部具有"V"形槽。符合Qingquanella Cui et Huo,1985的属征,与模式种湖北清泉虫Q.hubeiensis相似,将其厘定为湖北清泉虫相似种Q.cf.hubeiensis。本属产于湖北水井沱组、石牌组及陕西辛集组,黔东地区"清虚洞组"发现清泉虫Qingquanella,增加了清泉虫的产地信息、新的类群,其壳体形态由切卵变圆形,生态环境由浅水向深水变化,为高肌虫的形态分类、早期演化与辐射分异提供新的材料。
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.20203009 and 20432010)Hubei Province Science Foundations(Nos.2004ABC002 and 2005ABB012(a Grant for Young Distinguished Scholar))+1 种基金a Grant from the Ministry of Science and Technology of China(No.2004CCA00100)the China Scholarship Council.
文摘The electronic singlet vertical excited states of photosynthetic reaction center(PSRC)in Rhodopseudomonas(Rps.)viridis were investigated by ZINDO and INDO/S methods.The effects of the interactions of pigment-pigment and pigment-protein on the electronic excitations were examined.The calculation results showed that the interactions of pigment-pigment and pigment-protein play an important role in reasonably assigning the experimental absorption and circular dichroism(CD)spec-tra of PSRC in Rps.virids.By comparing the theoretically computed excited states with the experi-mental absorption and CD spectra,satisfactory assignments of the experimental spectroscopic peaks were achieved.
文摘To improve the performance of traditional nucle-ation additives and their compatibility with other additives,as well as to solve complex problems in practical applications,SiO_(2) precursors were reactively grafted in situ with the sym-metrical hydroxyl groups of the nucleation agents.With this approach,the dissymmetrical part of the nucleation agents plays an important role.As a result,the prepared composite additive—the nanoparticle precursor(NPP0)—produces excellent results.The NPP0-PP composite has a transparency of over 93%,haze lower than 15%,and a heat distortion temperature(HDT)of 142℃,which is more than the 110℃ of the pure PP matrix.In addition,it maintains over 90%of the mechanical properties with a deformation coefficient less than 1%.This indicates a strong nanoeffect.
