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美国发布2050年前实现净零排放的长期战略 快报文章
气候变化快报,2021年第22期
作者:  刘莉娜
Microsoft Word(17Kb)  |  收藏  |  浏览/下载:864/0  |  提交时间:2021/11/20
Long-term Strategy  United States  Net-Zero Greenhouse Gas Emissions  
新气候研究所提出制定长期低排放发展战略的建议 快报文章
气候变化快报,2020年第12期
作者:  刘燕飞
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:449/0  |  提交时间:2020/06/19
long-term low greenhouse gas emission development strategy(LTS)  UNFCCC  Nationally Determined Contributions(NDCs)  
Live-animal imaging of native haematopoietic stem and progenitor cells 期刊论文
NATURE, 2020, 578 (7794) : 278-+
作者:  Gerstung, Moritz;  Jolly, Clemency;  Leshchiner, Ignaty;  Dentro, Stefan C.;  Gonzalez, Santiago;  Rosebrock, Daniel;  Mitchell, Thomas J.;  Rubanova, Yulia;  Anur, Pavana;  Yu, Kaixian;  Tarabichi, Maxime;  Deshwar, Amit;  Wintersinger, Jeff;  Kleinheinz, Kortine;  Vazquez-Garcia, Ignacio;  Haase, Kerstin;  Jerman, Lara;  Sengupta, Subhajit;  Macintyre, Geoff;  Malikic, Salem;  Donmez, Nilgun;  Livitz, Dimitri G.;  Cmero, Marek;  Demeulemeester, Jonas;  Schumacher, Steven;  Fan, Yu;  Yao, Xiaotong;  Lee, Juhee;  Schlesner, Matthias;  Boutros, Paul C.;  Bowtell, David D.;  Zhu, Hongtu;  Getz, Gad;  Imielinski, Marcin;  Beroukhim, Rameen;  Sahinalp, S. Cenk;  Ji, Yuan;  Peifer, Martin;  Markowetz, Florian;  Mustonen, Ville;  Yuan, Ke;  Wang, Wenyi;  Morris, Quaid D.;  Spellman, Paul T.;  Wedge, David C.;  Van Loo, Peter;  Deshwar, Amit G.;  Adams, David J.;  Campbell, Peter J.;  Cao, Shaolong;  Christie, Elizabeth L.;  Cun, Yupeng;  Dawson, Kevin J.;  Drews, Ruben M.;  Eils, Roland;  Fittall, Matthew;  Garsed, Dale W.;  Ha, Gavin;  Lee-Six, Henry;  Martincorena, Inigo;  Oesper, Layla;  Peto, Myron;  Raphael, Benjamin J.;  Salcedo, Adriana;  Shi, Ruian;  Shin, Seung Jun;  Spiro, Oliver;  Stein, Lincoln D.;  Vembu, Shankar;  Wheeler, David A.;  Yang, Tsun-Po
收藏  |  浏览/下载:45/0  |  提交时间:2020/07/03

The biology of haematopoietic stem cells (HSCs) has predominantly been studied under transplantation conditions(1,2). It has been particularly challenging to study dynamic HSC behaviour, given that the visualization of HSCs in the native niche in live animals has not, to our knowledge, been achieved. Here we describe a dual genetic strategy in mice that restricts reporter labelling to a subset of the most quiescent long-term HSCs (LT-HSCs) and that is compatible with current intravital imaging approaches in the calvarial bone marrow(3-5). We show that this subset of LT-HSCs resides close to both sinusoidal blood vessels and the endosteal surface. By contrast, multipotent progenitor cells (MPPs) show greater variation in distance from the endosteum and are more likely to be associated with transition zone vessels. LT-HSCs are not found in bone marrow niches with the deepest hypoxia and instead are found in hypoxic environments similar to those of MPPs. In vivo time-lapse imaging revealed that LT-HSCs at steady-state show limited motility. Activated LT-HSCs show heterogeneous responses, with some cells becoming highly motile and a fraction of HSCs expanding clonally within spatially restricted domains. These domains have defined characteristics, as HSC expansion is found almost exclusively in a subset of bone marrow cavities with bone-remodelling activity. By contrast, cavities with low bone-resorbing activity do not harbour expanding HSCs. These findings point to previously unknown heterogeneity within the bone marrow microenvironment, imposed by the stages of bone turnover. Our approach enables the direct visualization of HSC behaviours and dissection of heterogeneity in HSC niches.


A dual genetic strategy enables the labelling and in vivo imaging of native long-term haematopoietic stem cells in the mouse calvarial bone marrow.


  
BLOSSOM — Bridging long-term scenario and strategy analysis: organisation and methods 科技报告
来源:European Environment Agency (EEA). 出版年: 2011
作者:  [null]
收藏  |  浏览/下载:22/0  |  提交时间:2019/04/05
long-term perspective  BLOSSOM  scenarios  policy-making  scenario studies  strategy analysis  policy instruments