The analysis of growth bands in the eyestalk has been increasingly used for estimating crustacean ageing and molting.In this study,we developed an effective method to process and observe the eyestalk microstructure of...The analysis of growth bands in the eyestalk has been increasingly used for estimating crustacean ageing and molting.In this study,we developed an effective method to process and observe the eyestalk microstructure of the swimming crab(Portunus trituberculatus).We found that dark pigmentation as a result of boiling has an influence on the observation of the eyestalk microstructure.Choosing an unboiled eyestalk,this study compared the cross section and longitudinal section,and concluded that the cross section is suitable for the observation of growth increments with 6.1%CV(coefficient of variation),and growth bands are suitable for the observation of the longitudinal section with 5.4%CV.The width of growth increments near the edge of the endocuticle is small,and the width of growth increments of the middle part of the endocuticle is large.Relationship of number of growth bands to molting time was fitted to a linear function with the slope not significantly different from 1,indicating that growth bands are formed associated with molting.Periodicity of growth increment formation was calculated as 3.7 d,however was not verified.Our results provide a new improved technique for identification of crustacean molting and growth.展开更多
A gastric neuroendocrine tumor(NET)is generated from deep within the tissue mucosal layers.In many cases,NETs are discovered as submucosal tumor(SMT)-like structures by forming a tumor mass.This case has a clear mucos...A gastric neuroendocrine tumor(NET)is generated from deep within the tissue mucosal layers.In many cases,NETs are discovered as submucosal tumor(SMT)-like structures by forming a tumor mass.This case has a clear mucosal demarcation line and developed like a polyp.A dilated blood vessel was found on the surface.The mass lacked the yellow color characteristic of NETs,and a SMT-like form was evident.Therefore,a nonspecific epithelial lesion was suspected and we performed endoscopy with magnifying narrowband imaging(M-NBI).However,this approach did not lead to the diagnosis,as we diagnosed the lesion as a NET by biopsy examination.The lesion was excised by endoscopic submucosal dissection.The histopathological examination proved that the lesion was a polypoid lesion although it was also a NET because the tumorcells extended upward through the normal gland ducts scatteredly.To our knowledge,there is no previous report of NET G1 with such unique histopathological growth progress and macroscopic appearance shown by detailed examination using endoscopy with M-NBI.展开更多
We have successfully grown an arsenopyrite marcasite type RhSb2 single crystal, and systematically investigated its crystal structure, electrical transport, magnetic susceptibility, heat capacity, and thermodynamic pr...We have successfully grown an arsenopyrite marcasite type RhSb2 single crystal, and systematically investigated its crystal structure, electrical transport, magnetic susceptibility, heat capacity, and thermodynamic properties. We found that the temperature-dependent resistivity exhibits a bad metal behavior with a board peak around 200 K. The magnetic susceptibility of RhSb2 shows diamagnetism from 300 K to 2 K. The low-temperature specific heat shows a metallic behavior with a quite small electronic specific-heat coefficient. No phase transition is observed in both specific heat and magnetic susceptibility data. The Hall resistivity measurements show that the conduction carriers are dominated by electrons with ne = 8.62 × 10^(18) cm^(-3) at 2 K, and the electron carrier density increases rapidly above 200 K without change sign. Combining with ab-initio band structure calculations, we showed that the unusual peak around 200 K in resistivity is related to the distinct electronic structure of RhSb_2. In addition, a large thermopower S(T) about -140 μV/K is observed around 200 K, which might be useful for future thermoelectric applications.展开更多
基金The National Key R&D Program of China under contract No.2019YFD0901404the National Natural Science Foundation of China under contract No.41876141+3 种基金the Program for Professor of Special Appointment(Eastern Scholar)at Shanghai Institutions of Higher Learning under contract No.0810000243the Shanghai Pujiang Program under contract No.18PJ1404100the Shanghai Science and Technology Innovation Action Plan under contract No.19DZ1207502Programs Foundation of Ministry of Education of China under contract No.20133104120001。
文摘The analysis of growth bands in the eyestalk has been increasingly used for estimating crustacean ageing and molting.In this study,we developed an effective method to process and observe the eyestalk microstructure of the swimming crab(Portunus trituberculatus).We found that dark pigmentation as a result of boiling has an influence on the observation of the eyestalk microstructure.Choosing an unboiled eyestalk,this study compared the cross section and longitudinal section,and concluded that the cross section is suitable for the observation of growth increments with 6.1%CV(coefficient of variation),and growth bands are suitable for the observation of the longitudinal section with 5.4%CV.The width of growth increments near the edge of the endocuticle is small,and the width of growth increments of the middle part of the endocuticle is large.Relationship of number of growth bands to molting time was fitted to a linear function with the slope not significantly different from 1,indicating that growth bands are formed associated with molting.Periodicity of growth increment formation was calculated as 3.7 d,however was not verified.Our results provide a new improved technique for identification of crustacean molting and growth.
文摘A gastric neuroendocrine tumor(NET)is generated from deep within the tissue mucosal layers.In many cases,NETs are discovered as submucosal tumor(SMT)-like structures by forming a tumor mass.This case has a clear mucosal demarcation line and developed like a polyp.A dilated blood vessel was found on the surface.The mass lacked the yellow color characteristic of NETs,and a SMT-like form was evident.Therefore,a nonspecific epithelial lesion was suspected and we performed endoscopy with magnifying narrowband imaging(M-NBI).However,this approach did not lead to the diagnosis,as we diagnosed the lesion as a NET by biopsy examination.The lesion was excised by endoscopic submucosal dissection.The histopathological examination proved that the lesion was a polypoid lesion although it was also a NET because the tumorcells extended upward through the normal gland ducts scatteredly.To our knowledge,there is no previous report of NET G1 with such unique histopathological growth progress and macroscopic appearance shown by detailed examination using endoscopy with M-NBI.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11674375,11634015,11925408,and 11674369)the National Basic Research Program of China(Grant Nos.2016YFA0300600,2016YFA030240,2017YFA0302901,and 2018YFA0305700)+4 种基金the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(Grant Nos.QYZDB-SSW-SLH013,XDB28000000,and XXH13506-202)the Science Challenge Project of China(Grant No.TZ2016004)the K.C.Wong Education Foundation,China(Grant No.GJTD-2018-01)the Beijing Natural Science Foundation,China(Grant No.Z180008)the Beijing Municipal Science and Technology Commission,China(Grant No.Z181100004218001)。
文摘We have successfully grown an arsenopyrite marcasite type RhSb2 single crystal, and systematically investigated its crystal structure, electrical transport, magnetic susceptibility, heat capacity, and thermodynamic properties. We found that the temperature-dependent resistivity exhibits a bad metal behavior with a board peak around 200 K. The magnetic susceptibility of RhSb2 shows diamagnetism from 300 K to 2 K. The low-temperature specific heat shows a metallic behavior with a quite small electronic specific-heat coefficient. No phase transition is observed in both specific heat and magnetic susceptibility data. The Hall resistivity measurements show that the conduction carriers are dominated by electrons with ne = 8.62 × 10^(18) cm^(-3) at 2 K, and the electron carrier density increases rapidly above 200 K without change sign. Combining with ab-initio band structure calculations, we showed that the unusual peak around 200 K in resistivity is related to the distinct electronic structure of RhSb_2. In addition, a large thermopower S(T) about -140 μV/K is observed around 200 K, which might be useful for future thermoelectric applications.
