Chinese bulbuls （Pycnonotus sinensis） are small passerine birds that inhabit areas of central, southern and eastern China. Previous observations suggest that flee-living individuals of this species may change their ...Chinese bulbuls （Pycnonotus sinensis） are small passerine birds that inhabit areas of central, southern and eastern China. Previous observations suggest that flee-living individuals of this species may change their food intake in response to seasonal changes in ambient temperature. In the present study, we randomly assigned Chinese bulbuls to either a 30 ~C or 10 ~C group, and measured their body mass （BM）, body temperature, gross energy intake （GEl）, digestible energy intake （DEI）, and the length and mass of their digestive tracts over 28 days of acclimation at these temperatures. As predicted, birds in the 30 ℃ group had lower body mass, GEI and DEI relative to those in the 10 ℃ group. The length and mass of the digestive tract was also lower in the 30 ℃ group and trends in these parameters were positively correlated with BM, GEl and DEI. These results suggest that Chinese bulbuls reduced their absolute energy demands at relatively high temperatures by decreasing their body mass, GEI and DEI, and digestive tract size.展开更多
Zinc and cadmium are two main transition metal ions and play profound important roles in environmental and human health.But the distinctive detection of these two ions is still challenging since they belong to the sam...Zinc and cadmium are two main transition metal ions and play profound important roles in environmental and human health.But the distinctive detection of these two ions is still challenging since they belong to the same periodic group and have similar chemical properties.A fluorescent bipyridine-based porous organic polymer(Bpy-POP)containing aggregation caused quenching(ACQ)units(anthracene)and metal ions recognition units(bipyridine)was synthesized through the Schiff base condensation reaction.In the DMF/H_(2)O mixtures with the water fractions of 90%,the Bpy-POP aggregated and the fluorescent Bpy-POP quenched subsequently due to the ACQ effect of anthracene in the skeleton("OFF"state).With the addition of Zn^(2+)or Cd^(2+),however,the strong coordination of the bipyridine units from the adjacent Bpy-POPs with Zn^(2+)or Cd^(2+)induced the partial dispersion of large Bpy-POP aggregates.Consequently,the fluorescence intensities enhanced dramatically as well as the fluorescence emission shifted to redder region,showing an"ON"state.Combing the fluorescence increasing efficiency and the maximum emission wavelength shift degree together,Zn^(2+)and Cd^(2+)can be selectively discriminated and quantitatively detected,which exhibits a great promising of the present Bpy-POP based method in Zn^(2+)and Cd^(2+)monitoring in real samples.展开更多
基金supported by the National Natural Science Foundation of China(31070366)the‘Xinmiao’Project in Zhejiang Province
文摘Chinese bulbuls （Pycnonotus sinensis） are small passerine birds that inhabit areas of central, southern and eastern China. Previous observations suggest that flee-living individuals of this species may change their food intake in response to seasonal changes in ambient temperature. In the present study, we randomly assigned Chinese bulbuls to either a 30 ~C or 10 ~C group, and measured their body mass （BM）, body temperature, gross energy intake （GEl）, digestible energy intake （DEI）, and the length and mass of their digestive tracts over 28 days of acclimation at these temperatures. As predicted, birds in the 30 ℃ group had lower body mass, GEI and DEI relative to those in the 10 ℃ group. The length and mass of the digestive tract was also lower in the 30 ℃ group and trends in these parameters were positively correlated with BM, GEl and DEI. These results suggest that Chinese bulbuls reduced their absolute energy demands at relatively high temperatures by decreasing their body mass, GEI and DEI, and digestive tract size.
基金supported by the National Natural Science Foundation of China(22064001,41361088)Opening fund of Fundamental Science on Radioactive Geology and Exploration Technology Laboratory(RGET1810)
文摘Zinc and cadmium are two main transition metal ions and play profound important roles in environmental and human health.But the distinctive detection of these two ions is still challenging since they belong to the same periodic group and have similar chemical properties.A fluorescent bipyridine-based porous organic polymer(Bpy-POP)containing aggregation caused quenching(ACQ)units(anthracene)and metal ions recognition units(bipyridine)was synthesized through the Schiff base condensation reaction.In the DMF/H_(2)O mixtures with the water fractions of 90%,the Bpy-POP aggregated and the fluorescent Bpy-POP quenched subsequently due to the ACQ effect of anthracene in the skeleton("OFF"state).With the addition of Zn^(2+)or Cd^(2+),however,the strong coordination of the bipyridine units from the adjacent Bpy-POPs with Zn^(2+)or Cd^(2+)induced the partial dispersion of large Bpy-POP aggregates.Consequently,the fluorescence intensities enhanced dramatically as well as the fluorescence emission shifted to redder region,showing an"ON"state.Combing the fluorescence increasing efficiency and the maximum emission wavelength shift degree together,Zn^(2+)and Cd^(2+)can be selectively discriminated and quantitatively detected,which exhibits a great promising of the present Bpy-POP based method in Zn^(2+)and Cd^(2+)monitoring in real samples.
