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闽江源自然保护区植物区系成分及其特征 总被引:2,自引:0,他引:2
闽江源自然保护区具有维管束植物1078种(包括亚、变种),隶属于168科,635属。该区具有种类较为丰富,起源古老,孑遗植物较多,地理联系广泛等特点。在植物区系地理成分中,热带性质的成分占主导地位,主要为泛热带分布、热带亚洲分布、旧世界热带分布等。北温带分布及东亚分布等温带区成分亦较为丰富。还论述了闽江源与邻近地区植物区系的关系。 相似文献
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Clinton S. Robbins Filip K. Swirski 《Cellular and molecular life sciences : CMLS》2010,67(16):2685-2693
Monocytes participate importantly in immunity. Produced in the bone marrow and released into the blood, they circulate in
blood or reside in a spleen reservoir before entering tissue and giving rise to macrophages or dendritic cells. Monocytes
are more than transitional cells that adapt to a particular tissue environment indiscriminately. Accumulating evidence now
indicates that monocytes are heterogeneous in several species and are themselves predetermined for particular function in
the steady state and inflammation. Future therapeutics may harness this heterogeneity to target harmful functions while sparing
those that are beneficial. Here, we review recent advances on the ontogeny and function of monocytes and their subsets in
humans and mice. 相似文献
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P Dutta G Courties Y Wei F Leuschner R Gorbatov CS Robbins Y Iwamoto B Thompson AL Carlson T Heidt MD Majmudar F Lasitschka M Etzrodt P Waterman MT Waring AT Chicoine AM van der Laan HW Niessen JJ Piek BB Rubin J Butany JR Stone HA Katus SA Murphy DA Morrow MS Sabatine C Vinegoni MA Moskowitz MJ Pittet P Libby CP Lin FK Swirski R Weissleder M Nahrendorf 《Nature》2012,487(7407):325-329
During progression of atherosclerosis, myeloid cells destabilize lipid-rich plaques in the arterial wall and cause their rupture, thus triggering myocardial infarction and stroke. Survivors of acute coronary syndromes have a high risk of recurrent events for unknown reasons. Here we show that the systemic response to ischaemic injury aggravates chronic atherosclerosis. After myocardial infarction or stroke, Apoe-/- mice developed larger atherosclerotic lesions with a more advanced morphology. This disease acceleration persisted over many weeks and was associated with markedly increased monocyte recruitment. Seeking the source of surplus monocytes in plaques, we found that myocardial infarction liberated haematopoietic stem and progenitor cells from bone marrow niches via sympathetic nervous system signalling. The progenitors then seeded the spleen, yielding a sustained boost in monocyte production. These observations provide new mechanistic insight into atherogenesis and provide a novel therapeutic opportunity to mitigate disease progression. 相似文献
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