Pilomyxoid astrocytoma is a new identified variant type of pilocytic astrocytoma,and typically locates in the hypothalamic and chiasmatic region.Herein,we reported a nine-year-old boy with pilomyxoid astrocytoma in th...Pilomyxoid astrocytoma is a new identified variant type of pilocytic astrocytoma,and typically locates in the hypothalamic and chiasmatic region.Herein,we reported a nine-year-old boy with pilomyxoid astrocytoma in the cerebellum.MRI scanning showed a tumor involved the cerebellar vermis,tonsil,the forth ventricle and brainstem.It was homogeneous isointensity on T1WI,relative hyper-intensity on T2WI,hyper-intensity on fluid attenuated inversion recovery （FLAIR） images,and uniform enhancement on contrast T1WI.The tumor was sub-totally removed and was proved histologically to be pilomyxoid astrocytoma.Follow-up at the 5th month,MRI showed the residual tumor enlarged at the brainstem.The patient survived 10 months after the operation,and finally died of respiration failure resulting from brainstem dysfunction.展开更多
Radio frequency(RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications.Compared with electronic technology, photoni...Radio frequency(RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications.Compared with electronic technology, photonic technology has the advantages of wide bandwidth and high tuning precision, exhibiting great potential to realize high interference cancellation depth over broad band.In this paper, a comprehensive overview of photonic enabled RF self-interference cancellation(SIC)is presented.The operation principle of photonic RF SIC is introduced, and the advances in implementing photonic RF SIC according to the realization mechanism of phase reversal are summarized.For further realistic applications, the multipath RF SIC and the integrated photonic RF SIC are also surveyed.Finally, the challenges and opportunities of photonic RF SIC technology are discussed.展开更多
To investigate the relationship between protein aggregation and delayed neuronal death,we adopted rat models of 20 min ischemia.Brain ischemia was produced using the 2-vessel occlusion(2VO)model in rats Light microsco...To investigate the relationship between protein aggregation and delayed neuronal death,we adopted rat models of 20 min ischemia.Brain ischemia was produced using the 2-vessel occlusion(2VO)model in rats Light microscopy,transmission electronic microscopy and Western blot analysis were performed for morphological analysis of neurons,and protein detection.The results showed delayed neuronal death took place at 72 h after ischemia-reperfusion,protein aggregates formed at 4 h after reperfusion and reached the peak at 24 h after reper-fusion,and Western blot analysis was consistent with transmission electronic microscopy.We conclude that protein aggregation is one of the important factors leading to delayed neuronal death.展开更多
文摘Pilomyxoid astrocytoma is a new identified variant type of pilocytic astrocytoma,and typically locates in the hypothalamic and chiasmatic region.Herein,we reported a nine-year-old boy with pilomyxoid astrocytoma in the cerebellum.MRI scanning showed a tumor involved the cerebellar vermis,tonsil,the forth ventricle and brainstem.It was homogeneous isointensity on T1WI,relative hyper-intensity on T2WI,hyper-intensity on fluid attenuated inversion recovery （FLAIR） images,and uniform enhancement on contrast T1WI.The tumor was sub-totally removed and was proved histologically to be pilomyxoid astrocytoma.Follow-up at the 5th month,MRI showed the residual tumor enlarged at the brainstem.The patient survived 10 months after the operation,and finally died of respiration failure resulting from brainstem dysfunction.
基金supported in part by the National Key R&D Program of China (No.2019YFB2203202)National Natural Science Foundation of China (Nos.62075026 and 61875028)+3 种基金National Research Foundation of China (No.61404130403)Program for Innovative Talents in Universities of Liaoning Province (No.LR2019017)Dalian Science and Technology Innovation Foundation (No.2018J11CY006)Fundamental Research Funds for the Central Universities(Nos.DUT18ZD106, DUT18GF102, and DUT18LAB20)。
文摘Radio frequency(RF) self-interference is a key issue for the application of in-band full-duplex communication in beyond fifth generation and sixth generation communications.Compared with electronic technology, photonic technology has the advantages of wide bandwidth and high tuning precision, exhibiting great potential to realize high interference cancellation depth over broad band.In this paper, a comprehensive overview of photonic enabled RF self-interference cancellation(SIC)is presented.The operation principle of photonic RF SIC is introduced, and the advances in implementing photonic RF SIC according to the realization mechanism of phase reversal are summarized.For further realistic applications, the multipath RF SIC and the integrated photonic RF SIC are also surveyed.Finally, the challenges and opportunities of photonic RF SIC technology are discussed.
基金This project was supported by International Cooperation Fund of the Science and Technology Department of Jilin Province(No.20040707-1).
文摘To investigate the relationship between protein aggregation and delayed neuronal death,we adopted rat models of 20 min ischemia.Brain ischemia was produced using the 2-vessel occlusion(2VO)model in rats Light microscopy,transmission electronic microscopy and Western blot analysis were performed for morphological analysis of neurons,and protein detection.The results showed delayed neuronal death took place at 72 h after ischemia-reperfusion,protein aggregates formed at 4 h after reperfusion and reached the peak at 24 h after reper-fusion,and Western blot analysis was consistent with transmission electronic microscopy.We conclude that protein aggregation is one of the important factors leading to delayed neuronal death.
