Six main mitochondrial DNA （mtDNA） lineages have been described in minnow （Zacco platypus） samples obtained from northern, western and southern China Perdices et al. （2004） predicted that further sampling of oth...Six main mitochondrial DNA （mtDNA） lineages have been described in minnow （Zacco platypus） samples obtained from northern, western and southern China Perdices et al. （2004） predicted that further sampling of other tributaries might discover more lineages of this species. In this study, we collected 26 Zacco platypus individuals in the Huangshan area of eastern China and determined the cytochrome b （cytb） sequence variations. Combined with reported data in GenBank, we identified ten matrilines （Zacco A-J） in a total of 169 samples, with relatively high molecular divergence found among them. The Huangshan population had the greatest genetic variation among all sampled regions and hosted six of the ten matrilines. Our results highlight the significance of the Huangshan area for the conservation of Zacco platypus.展开更多
Duck-billed platypuses(鸭嘴兽)cannot be real,can they?The duck-billed platypuses of eastern Australia are small,shy animals.This small mammal is such a strange creature that when the first one arrived at the British M...Duck-billed platypuses(鸭嘴兽)cannot be real,can they?The duck-billed platypuses of eastern Australia are small,shy animals.This small mammal is such a strange creature that when the first one arrived at the British Museum in London 1798,scientists thought that someone was playing a practical joke on them.One cannot blame the scientists for having such展开更多
The mechanism of Cd（Ⅱ） uptake by the dead biomass of macrofungus Pleurotus platypus was investigated using different chemical and instrumental techniques. Sequential removal of cell wall components of the biosorben...The mechanism of Cd（Ⅱ） uptake by the dead biomass of macrofungus Pleurotus platypus was investigated using different chemical and instrumental techniques. Sequential removal of cell wall components of the biosorbent revealed that structural polysaccharides play a predominant role in the biosorption of Cd（Ⅱ）. The adsorption kinetics fitted well with the pseudo second-order model suggested that the adsorption of Cd（Ⅱ） on P. platypus involved a chemisorption process. Transmission electron microscopy of the cadmium exposed biomass confirmed the deposition of the metal mainly in the metal loaded biosorbent confirmed the participation of-OH, - the cell wall. Fourier transform infrared spectroscopic analysis of NH and C-O-C groups in the uptake of Cd（Ⅱ）. Energy dispersive X-ray analysis of the biosorbent before and after metal uptake revealed that the main mechanism of adsorption was ion-exchange. The effectiveness of CaCl2 in the desorption of cadmium perhaps suggested the exchange of Ca^2＋ with Cd（Ⅱ）.展开更多
基金Foundation items： This research was funded by the National Natural Science Foundation of China （NSFC 30870290, 31071891 and 31471968）ACKNOWLEDGEMENTS We extend our thanks to Dr. Robert W. MURPHY for his valuable comments on this manuscript. We thank Jin-Min CHEN （Yunnan University）, Bao-Lin ZHANG （Kunming Institute of Zoology, CAS） and Li-Fang PENG （Nanjing Forestry University） for their help in data processing. We further thank Dian- Cheng YANG （Nanjing Forestry University） and Jun-Sheng CUI （Anhui Agricultural University） for sampling.
文摘Six main mitochondrial DNA （mtDNA） lineages have been described in minnow （Zacco platypus） samples obtained from northern, western and southern China Perdices et al. （2004） predicted that further sampling of other tributaries might discover more lineages of this species. In this study, we collected 26 Zacco platypus individuals in the Huangshan area of eastern China and determined the cytochrome b （cytb） sequence variations. Combined with reported data in GenBank, we identified ten matrilines （Zacco A-J） in a total of 169 samples, with relatively high molecular divergence found among them. The Huangshan population had the greatest genetic variation among all sampled regions and hosted six of the ten matrilines. Our results highlight the significance of the Huangshan area for the conservation of Zacco platypus.
文摘Duck-billed platypuses(鸭嘴兽)cannot be real,can they?The duck-billed platypuses of eastern Australia are small,shy animals.This small mammal is such a strange creature that when the first one arrived at the British Museum in London 1798,scientists thought that someone was playing a practical joke on them.One cannot blame the scientists for having such
文摘The mechanism of Cd（Ⅱ） uptake by the dead biomass of macrofungus Pleurotus platypus was investigated using different chemical and instrumental techniques. Sequential removal of cell wall components of the biosorbent revealed that structural polysaccharides play a predominant role in the biosorption of Cd（Ⅱ）. The adsorption kinetics fitted well with the pseudo second-order model suggested that the adsorption of Cd（Ⅱ） on P. platypus involved a chemisorption process. Transmission electron microscopy of the cadmium exposed biomass confirmed the deposition of the metal mainly in the metal loaded biosorbent confirmed the participation of-OH, - the cell wall. Fourier transform infrared spectroscopic analysis of NH and C-O-C groups in the uptake of Cd（Ⅱ）. Energy dispersive X-ray analysis of the biosorbent before and after metal uptake revealed that the main mechanism of adsorption was ion-exchange. The effectiveness of CaCl2 in the desorption of cadmium perhaps suggested the exchange of Ca^2＋ with Cd（Ⅱ）.
