After removal of the caries or diseased teeth,the alveolar ridge will undergo absorption and atrophy.When the amount of alveolar bone is insufficient,it will cause an inability to perform effective dental implant rest...After removal of the caries or diseased teeth,the alveolar ridge will undergo absorption and atrophy.When the amount of alveolar bone is insufficient,it will cause an inability to perform effective dental implant restoration.In order to control the absorption and promote the repair and regeneration of alveolar ridge,a method of implanting guided bone regeneration(GBR)membranes at the extraction site is often used.In this study,silk fibroin(SF)and poly-L-lactide lactone(PLCL)were used to prepare bilayered guided bone regeneration membranes,and its morphology,hydrophilicity,surface roughness and mechanical properties were studied.At the same time,the drug release behaviors and cell compatibility of the bilayered membranes were studied.The results showed that SF/PLCL bi-layered membranes had good mechanical properties and surface hydrophilicity,and the drug-loaded bi-layered membranes had good cell compatibility.The bilayered membranes fabricated in this study are of potential for applying in the oral health field to promote bone regeneration.展开更多
PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initial...PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton scale.The experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,China.The detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional scintillation.In this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.展开更多
We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days...We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days of exposure,no DM particle candidate event was found.This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results.The minimum upper limit,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.展开更多
The co-evolution of Orobanche spp.and their hosts within the same environment has resulted in a high degree of adaptation and effective parasitism whereby the host releases parasite germination stimulants,which are li...The co-evolution of Orobanche spp.and their hosts within the same environment has resulted in a high degree of adaptation and effective parasitism whereby the host releases parasite germination stimulants,which are likely to be unstable in the soil.Our objective was to investigate whether extracts from non-host plants,specifically,Chinese medicinal plants,could stimulate germination of Orobanche spp.Samples of 606 Chinese medicinal herb species were extracted with deionized water and methanol.The extracts were used to induce germination of three Orobanche species;Orobanche minor,Orobanche cumana,and Orobanche aegyptiaca.O.minor exhibited a wide range of germination responses to the various herbal extracts.O.cumana and O.aegyptiaca exhibited an intermediate germination response to the herbal extracts.O.minor,which has a narrow host spectrum,showed higher germination rates in response to different herbal extracts compared with those of O.cumana and O.aegyptiaca,which have a broader host spectrum.Methanolic extracts of many Chinese herbal species effectively stimulated seed germination among the Orobanche spp.,even though they were not the typical hosts.The effective herbs represent interesting examples of potential trap crops.Different countries can also screen extracts from indigenous herbaceous plants for their ability to induce germination of Orobanche spp.seeds.The use of such species as trap plants could diminish the global soil seed bank of Orobanche.展开更多
基金Natural Science Foundation for Key Program of the Jiangsu Higher Education Institutions,China(No.19KJA610004)Natural Science Foundation of Jiangsu Province,China(No.BK20161254)+1 种基金China Postdoctoral Science Foundation(No.2019M651947)Mandatory Projects of Nantong Municipal Science and Technology Plan,China(No.JC2018004)
文摘After removal of the caries or diseased teeth,the alveolar ridge will undergo absorption and atrophy.When the amount of alveolar bone is insufficient,it will cause an inability to perform effective dental implant restoration.In order to control the absorption and promote the repair and regeneration of alveolar ridge,a method of implanting guided bone regeneration(GBR)membranes at the extraction site is often used.In this study,silk fibroin(SF)and poly-L-lactide lactone(PLCL)were used to prepare bilayered guided bone regeneration membranes,and its morphology,hydrophilicity,surface roughness and mechanical properties were studied.At the same time,the drug release behaviors and cell compatibility of the bilayered membranes were studied.The results showed that SF/PLCL bi-layered membranes had good mechanical properties and surface hydrophilicity,and the drug-loaded bi-layered membranes had good cell compatibility.The bilayered membranes fabricated in this study are of potential for applying in the oral health field to promote bone regeneration.
基金supported by a 985 grant from Shanghai Jiao Tong Universitythe National Basic Research Program of China (Grant No. 2010CB833005)+4 种基金the National Natural Science Foundation of China (Grant No. 11055003)the Office of Science and Technology in Shanghai Municipal Government (Grant No. 11DZ2260700)sponsored by Shandong University, Peking Universitythe University of Marylandthe University of Michigan
文摘PandaX is a large liquid-xenon detector experiment usable for direct dark-matter detection and 136Xe double-beta decay search.The central vessel was designed to accommodate a staged target volume increase from initially 120 kg(stage I)to 0.5 t(stage II)and eventually to a multi-ton scale.The experiment is located in the Jinping Deep-Underground Laboratory in Sichuan,China.The detector operates in dual-phase mode,allowing detection of both prompt scintillation,and ionization charge through proportional scintillation.In this paper a detailed description of the stage I detector design and performance as well as results established during the commissioning phase are presented.
基金supported by the 985-Ⅲ grant from Shanghai Jiao Tong Universitythe National Basic Research Program of China from Ministry of Science and Technology of China (Grant No.2010CB833005)+6 种基金the National Natural Science Foundation of China (Grant No.11055003)the Office of Science and Technology in Shanghai Municipal Government (Grant No.11DZ2260700)support from China Postdoctoral Science Foundation (Grant No.2014M551395)sponsored by Shandong UniversityPeking Universitythe University of Marylandthe University of Michigan
文摘We report on the first dark-matter(DM)search results from PandaX-I,a low threshold dual-phase xenon experiment operating at the China JinPing Underground Laboratory.In the 37-kg liquid xenon target with 17.4 live-days of exposure,no DM particle candidate event was found.This result sets a stringent limit for low-mass DM particles and disfavors the interpretation of previously-reported positive experimental results.The minimum upper limit,3.7×10-44cm2,for the spin-independent isoscalar DM-particle-nucleon scattering cross section is obtained at a DM-particle mass of 49 GeV/c2at 90%confidence level.
基金supported by the National Natural Science Foundation of China (Grant No. 30870403)State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau (Grant No. 10502-Z7-3)
文摘The co-evolution of Orobanche spp.and their hosts within the same environment has resulted in a high degree of adaptation and effective parasitism whereby the host releases parasite germination stimulants,which are likely to be unstable in the soil.Our objective was to investigate whether extracts from non-host plants,specifically,Chinese medicinal plants,could stimulate germination of Orobanche spp.Samples of 606 Chinese medicinal herb species were extracted with deionized water and methanol.The extracts were used to induce germination of three Orobanche species;Orobanche minor,Orobanche cumana,and Orobanche aegyptiaca.O.minor exhibited a wide range of germination responses to the various herbal extracts.O.cumana and O.aegyptiaca exhibited an intermediate germination response to the herbal extracts.O.minor,which has a narrow host spectrum,showed higher germination rates in response to different herbal extracts compared with those of O.cumana and O.aegyptiaca,which have a broader host spectrum.Methanolic extracts of many Chinese herbal species effectively stimulated seed germination among the Orobanche spp.,even though they were not the typical hosts.The effective herbs represent interesting examples of potential trap crops.Different countries can also screen extracts from indigenous herbaceous plants for their ability to induce germination of Orobanche spp.seeds.The use of such species as trap plants could diminish the global soil seed bank of Orobanche.
