Environments with reciprocal patchiness of resources, in which the availability of two resources such as light and soil nutrients are patchily distributed in horizontal space and negatively correlated in each patch, a...Environments with reciprocal patchiness of resources, in which the availability of two resources such as light and soil nutrients are patchily distributed in horizontal space and negatively correlated in each patch, are common in many ecosystems. The strategies by which clonal plants adapt to this type of heterogeneous environment were examined in three stoloniferous herbs,Potentilla reptans L. var. sericophylla Franch., P. anserina L. and Halerpestes ruthenica (Jacq.) Qvcz., commonly inhabiting forest understories, grasslands and low saline meadows, respectively. As pairs of connected ramets were subjected to reciprocal patchiness of light and nutrients, stolon connection between the two ramets significantly enhanced biomass of both ramet growing in low light intensity but high soil nutrient condition (LH ramet) and ramet growing in high light intensity but low soil nutrient condition (HL ramet) as well as whole ramet pairs (consisting of LH ramets and HL ramets). Additionally, stolon connection greatly increased root/shoot ratio of LH ramet while significantly decreased that of HL ramet. The results indicate that a reciprocal transportation of resources between interconnected ramets and a functional specialization of ramets in uptake of abundant resources occurred. By resource sharing and functional specialization, clonal plants can efficiently acquire locally abundant resources and buffer the stress caused by reciprocal patchiness of resources.展开更多
目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊...目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊柱微创通道镜系统辅助TLIF术治疗,B组行常规TLIF术治疗。比较两组手术指标,腰腿部疼痛与功能障碍状况,脊髓功能,血清P物质(SP)、前列腺素E2(PGE2)水平。结果A组术中失血量、术后引流量均少于B组,下床活动时间短于B组(P<0.05);术后4周两组腰腿部视觉模拟评分法(VAS)与Oswestry障碍指数(ODI)评分均较术前均明显改善(P<0.05);术后7 d两组各项脊髓功能指标较术前均明显改善,且A组改善幅度优于B组(P<0.05);术后3 d A组血清SP水平高于B组,而血清PGE2水平低于B组(P<0.05)。结论脊柱微创通道镜系统辅助TLIF术可显著改善腰椎退行性疾病患者脊髓功能以及疼痛介质水平。展开更多
文摘Environments with reciprocal patchiness of resources, in which the availability of two resources such as light and soil nutrients are patchily distributed in horizontal space and negatively correlated in each patch, are common in many ecosystems. The strategies by which clonal plants adapt to this type of heterogeneous environment were examined in three stoloniferous herbs,Potentilla reptans L. var. sericophylla Franch., P. anserina L. and Halerpestes ruthenica (Jacq.) Qvcz., commonly inhabiting forest understories, grasslands and low saline meadows, respectively. As pairs of connected ramets were subjected to reciprocal patchiness of light and nutrients, stolon connection between the two ramets significantly enhanced biomass of both ramet growing in low light intensity but high soil nutrient condition (LH ramet) and ramet growing in high light intensity but low soil nutrient condition (HL ramet) as well as whole ramet pairs (consisting of LH ramets and HL ramets). Additionally, stolon connection greatly increased root/shoot ratio of LH ramet while significantly decreased that of HL ramet. The results indicate that a reciprocal transportation of resources between interconnected ramets and a functional specialization of ramets in uptake of abundant resources occurred. By resource sharing and functional specialization, clonal plants can efficiently acquire locally abundant resources and buffer the stress caused by reciprocal patchiness of resources.
文摘目的探讨脊柱微创通道镜系统辅助椎间孔腰椎椎体间融合术(TLIF)对腰椎退行性疾病患者脊髓功能及血清P物质(SP)、前列腺素E2(PGE2)水平的影响。方法选取51例腰椎退行性疾病患者,按照入院次序单双号法分为A组(n=25)及B组(n=26)。A组行脊柱微创通道镜系统辅助TLIF术治疗,B组行常规TLIF术治疗。比较两组手术指标,腰腿部疼痛与功能障碍状况,脊髓功能,血清P物质(SP)、前列腺素E2(PGE2)水平。结果A组术中失血量、术后引流量均少于B组,下床活动时间短于B组(P<0.05);术后4周两组腰腿部视觉模拟评分法(VAS)与Oswestry障碍指数(ODI)评分均较术前均明显改善(P<0.05);术后7 d两组各项脊髓功能指标较术前均明显改善,且A组改善幅度优于B组(P<0.05);术后3 d A组血清SP水平高于B组,而血清PGE2水平低于B组(P<0.05)。结论脊柱微创通道镜系统辅助TLIF术可显著改善腰椎退行性疾病患者脊髓功能以及疼痛介质水平。
