A very recent study by Bálint et al.published in Science deciphered in detail how cytotoxic T lymphocytes(CTLs)kill target cells.1 They found that perforin and pellet enzyme—the cytotoxic substances in CTLs—com...A very recent study by Bálint et al.published in Science deciphered in detail how cytotoxic T lymphocytes(CTLs)kill target cells.1 They found that perforin and pellet enzyme—the cytotoxic substances in CTLs—combined and assembled into supramolecular attack particles(SMAPs).The SMAPs were subsequently released toward the cell membrane of the target cell.The shell of SMAP was rich in glycoproteins that enabled its stability to maintain the cell-killing activity for hours,in which the thrombospondin-1(TSP-1)was critical(Fig.1).展开更多
Since last October, loose monetary and credit policies and the stimulus package have produced desired results. The economy has entered into a "V-shaped" recovery in the second quarter of this year after hitt...Since last October, loose monetary and credit policies and the stimulus package have produced desired results. The economy has entered into a "V-shaped" recovery in the second quarter of this year after hitting the bottom in the first quarter, with various economic indicators rising fast, rescue missions completed and short-term objectives basically met. In this context, the next step of macro-regulation should focus on long-term objectives, speed up institutional innovation and restructuring, control the intensity, pattern and pace of short-term policy loosening and prevent inflation and wild swings in the economy so as to achieve a new round of sustained and rapid economic growth.展开更多
文摘A very recent study by Bálint et al.published in Science deciphered in detail how cytotoxic T lymphocytes(CTLs)kill target cells.1 They found that perforin and pellet enzyme—the cytotoxic substances in CTLs—combined and assembled into supramolecular attack particles(SMAPs).The SMAPs were subsequently released toward the cell membrane of the target cell.The shell of SMAP was rich in glycoproteins that enabled its stability to maintain the cell-killing activity for hours,in which the thrombospondin-1(TSP-1)was critical(Fig.1).
文摘Since last October, loose monetary and credit policies and the stimulus package have produced desired results. The economy has entered into a "V-shaped" recovery in the second quarter of this year after hitting the bottom in the first quarter, with various economic indicators rising fast, rescue missions completed and short-term objectives basically met. In this context, the next step of macro-regulation should focus on long-term objectives, speed up institutional innovation and restructuring, control the intensity, pattern and pace of short-term policy loosening and prevent inflation and wild swings in the economy so as to achieve a new round of sustained and rapid economic growth.
