文章主要研究了Y_(2)SiO_(5):Pr^(3+)上转换纳米荧光粉对ZnO:Pr^(3+)的光催化性能的影响,通过XRD、FE-SEM、FL和UV-Vis对样品的物相、形貌、发光性能和光催化行性能进行了分析表征,实验结果表明:随着Y_(2)SiO_(5):Pr^(3+)上转换纳米荧...文章主要研究了Y_(2)SiO_(5):Pr^(3+)上转换纳米荧光粉对ZnO:Pr^(3+)的光催化性能的影响,通过XRD、FE-SEM、FL和UV-Vis对样品的物相、形貌、发光性能和光催化行性能进行了分析表征,实验结果表明:随着Y_(2)SiO_(5):Pr^(3+)上转换纳米荧光粉的加入量增加,ZnO:Pr^(3+)光催化效率逐渐提高,当加入0.2 g Y_(2)SiO_(5):Pr^(3+)时,光催化效率最高,在光照60 min后对亚甲基蓝的降解率达到了98.11%,相比未加入Y_(2)SiO_(5):Pr^(3+)时的光催化效率有显著提升。展开更多
Plants are recurrently exposed to myriads of biotic and abiotic stresses leading to several biochemical and physiological variations that cause severe impacts on plant growth and survival.To overcome these challenges,...Plants are recurrently exposed to myriads of biotic and abiotic stresses leading to several biochemical and physiological variations that cause severe impacts on plant growth and survival.To overcome these challenges,plants activate two primary defense mechanisms,such as structural response(cell wall strengthening and waxy epidermal cuticle development)and metabolic changes,including the synthesis of anti-microbial compounds and proteins,especially the pathogenesis-related(PR)proteins.PR proteins are members of a super large family of defense proteins that exhibit antimicrobial activities.Their over-expression in plants provides tolerance to many abiotic and biotic stresses.PR proteins have been classified into 17 families,including PR-5–also called thaumatin-like proteins(TLPs)that involve osmotin and osmotin-like proteins(OLPs).Osmotin was first identified in tobacco(Nicotiana tabacum var.Wisconsin 38),and then its homolog proteins(OLPs)were reported from the whole plant kingdom.Osmotin and OLPs are ubiquitous in all fruits and vegetables.Their expression has been detected in various plant tissues and organs.The phylogenetic tree studies revealed that the osmotin group originated from spermatophytes.Moreover,the atomic structure of OLP has shown similarity to thaumatin and TLPs from monocot and eudicot species,which determines a strong evolutionary pressure in flowering plants for conserving thaumatin fold.This is associated with the role of these proteins against pathogens as defense molecules and to induce stress tolerance to plants against several biotic and abiotic factors.In this review,we have briefly described the development history of osmotin,including its function and mechanism to induce biotic and abiotic stress tolerance to plants.展开更多
A novel coordination polymer,[Pr2（BIPA）3（H2O）2].2H2O（1）（H2BIPA=5-bromoisophthalic acid）,was prepared by hydrothermal synthesis and characterized by IR spectroscopy,elemental analysis and single-crystal X-ray d...A novel coordination polymer,[Pr2（BIPA）3（H2O）2].2H2O（1）（H2BIPA=5-bromoisophthalic acid）,was prepared by hydrothermal synthesis and characterized by IR spectroscopy,elemental analysis and single-crystal X-ray diffraction.The crystal was of monoclinic system,space group C2/c,with a=1.98037（14）,b=1.44189（14）,c=2.15281（18） nm,β=95.220（2）°,V=6.1218（9） nm3,C24H17Br3O16Pr2,Mr=1082.93,Dc= 2.350 g/cm3,F（000）=4096,μ=7.136 mm-1 and Z=8.The final R1=0.0608 and wR2=0.1371 for 5624 observed reflections（I2σ（I））.Complex 1 featured an interesting 2D layer containing {Pr2（CO2）3}n right-handed and left-handed helical chains.Furthermore,hydrogen bonds linked the adjacent 2D layers to form a 3D supramolecular framework.Moreover,the near-infrared luminescent properties of 1 were also investigated in the solid state.展开更多
文摘文章主要研究了Y_(2)SiO_(5):Pr^(3+)上转换纳米荧光粉对ZnO:Pr^(3+)的光催化性能的影响,通过XRD、FE-SEM、FL和UV-Vis对样品的物相、形貌、发光性能和光催化行性能进行了分析表征,实验结果表明:随着Y_(2)SiO_(5):Pr^(3+)上转换纳米荧光粉的加入量增加,ZnO:Pr^(3+)光催化效率逐渐提高,当加入0.2 g Y_(2)SiO_(5):Pr^(3+)时,光催化效率最高,在光照60 min后对亚甲基蓝的降解率达到了98.11%,相比未加入Y_(2)SiO_(5):Pr^(3+)时的光催化效率有显著提升。
文摘Plants are recurrently exposed to myriads of biotic and abiotic stresses leading to several biochemical and physiological variations that cause severe impacts on plant growth and survival.To overcome these challenges,plants activate two primary defense mechanisms,such as structural response(cell wall strengthening and waxy epidermal cuticle development)and metabolic changes,including the synthesis of anti-microbial compounds and proteins,especially the pathogenesis-related(PR)proteins.PR proteins are members of a super large family of defense proteins that exhibit antimicrobial activities.Their over-expression in plants provides tolerance to many abiotic and biotic stresses.PR proteins have been classified into 17 families,including PR-5–also called thaumatin-like proteins(TLPs)that involve osmotin and osmotin-like proteins(OLPs).Osmotin was first identified in tobacco(Nicotiana tabacum var.Wisconsin 38),and then its homolog proteins(OLPs)were reported from the whole plant kingdom.Osmotin and OLPs are ubiquitous in all fruits and vegetables.Their expression has been detected in various plant tissues and organs.The phylogenetic tree studies revealed that the osmotin group originated from spermatophytes.Moreover,the atomic structure of OLP has shown similarity to thaumatin and TLPs from monocot and eudicot species,which determines a strong evolutionary pressure in flowering plants for conserving thaumatin fold.This is associated with the role of these proteins against pathogens as defense molecules and to induce stress tolerance to plants against several biotic and abiotic factors.In this review,we have briefly described the development history of osmotin,including its function and mechanism to induce biotic and abiotic stress tolerance to plants.
基金Project supported by the National Natural Science Foundation of China (20971004)the Key Project of Chinese Ministry of Education (210102)
文摘A novel coordination polymer,[Pr2（BIPA）3（H2O）2].2H2O（1）（H2BIPA=5-bromoisophthalic acid）,was prepared by hydrothermal synthesis and characterized by IR spectroscopy,elemental analysis and single-crystal X-ray diffraction.The crystal was of monoclinic system,space group C2/c,with a=1.98037（14）,b=1.44189（14）,c=2.15281（18） nm,β=95.220（2）°,V=6.1218（9） nm3,C24H17Br3O16Pr2,Mr=1082.93,Dc= 2.350 g/cm3,F（000）=4096,μ=7.136 mm-1 and Z=8.The final R1=0.0608 and wR2=0.1371 for 5624 observed reflections（I2σ（I））.Complex 1 featured an interesting 2D layer containing {Pr2（CO2）3}n right-handed and left-handed helical chains.Furthermore,hydrogen bonds linked the adjacent 2D layers to form a 3D supramolecular framework.Moreover,the near-infrared luminescent properties of 1 were also investigated in the solid state.
