It is extremely important to analyze the contaminative behaviors of Perfluoroalkyl acids(PFAAs) due to their serious threats to urban environments which are closely related to humans. Current study aimed to explore th...It is extremely important to analyze the contaminative behaviors of Perfluoroalkyl acids(PFAAs) due to their serious threats to urban environments which are closely related to humans. Current study aimed to explore the distribution, source apportionment and ecological risk assessment of PFAAs in surface water from Shijiazhuang, China. The concentrations of ΣPFAAs ranged from 19.5 to 125.9 ng/L in the investigation area. Perfluorobutanesulfonic acid(PFBS) and perfluoropentanoic acid(PFPeA) were the predominant contaminants(mean value: 14.3 ng/L and 16.6 ng/L, respectively). The distribution of PFAAs according to geospatial analysis and hierarchical clustering analysis(HCA) showed that higher levels of ΣPFAAs were detected in the southern surface water of Shijiazhuang and there was a stepwise decrease from the wet season to the dry season. Furthermore, based on source apportionment,the dominant potential sources were found to be wastewater treatment plant(WWTP) effluents and industrial discharge. The risk quotients(RQs) revealed low ecological risks of all PFAAs for aquatic organisms in Shijiazhuang surface water. Collectively, this study provided basic data for regulatory strategies for controlling PFAA pollutions in urban surface water.展开更多
OBJECTIVE:To observe the therapeutic effect of lumbar tender point deep tissue massage plus lumbar traction on chronic non-specific low back pain using change in pressure pain threshold,muscle hardness and pain intens...OBJECTIVE:To observe the therapeutic effect of lumbar tender point deep tissue massage plus lumbar traction on chronic non-specific low back pain using change in pressure pain threshold,muscle hardness and pain intensity as indices.METHODS:We randomly divided 64 patients into a treatment group(32 cases) and a control group(32 cases).Two drop-outs occurred in each group.Patients in the treatment group received tender point deep tissue massage plus lumbar traction and patients in the control group received lumbar traction,alone.We used a tissue hardness meter/algometer and visual analog scale(VAS) to assess the pressure pain threshold,muscle hardness and pain intensity.RESULTS:Following treatment,we obtained the following results in the treatment and control groups,respectively:the pressure pain threshold difference was 1.5±0.8 and 1.1±0.7;the muscle hardness difference was 4.2±1.6 and 3.5±1.3;and the VAS score difference was 1.9±0.9 and 1.4±0.8.Compared to the control group,the treatment group had higher pressure pain threshold(t=2.09,P<0.05),and lower muscle hardness(t=2.05,P<0.05) and pain intensity(t=2.46,P<0.05).CONCLUSION:Lumbar tender point deep tissue massage combined with lumbar traction produced better improvement in pressure pain threshold,muscle hardness and pain intensity in patients with chronic non-specific low back pain than with lumbar traction alone.展开更多
基金supported by the National Natural Science Foundation of China (Nos. 41907321, 21777182)the Natural Science Foundation of Hebei Province (No. B2019208273)State Key Laboratory of Environmental Chemistry and Ecotoxicology, RCEES, Chinese Academy of Sciences (No. KF2018-17)。
文摘It is extremely important to analyze the contaminative behaviors of Perfluoroalkyl acids(PFAAs) due to their serious threats to urban environments which are closely related to humans. Current study aimed to explore the distribution, source apportionment and ecological risk assessment of PFAAs in surface water from Shijiazhuang, China. The concentrations of ΣPFAAs ranged from 19.5 to 125.9 ng/L in the investigation area. Perfluorobutanesulfonic acid(PFBS) and perfluoropentanoic acid(PFPeA) were the predominant contaminants(mean value: 14.3 ng/L and 16.6 ng/L, respectively). The distribution of PFAAs according to geospatial analysis and hierarchical clustering analysis(HCA) showed that higher levels of ΣPFAAs were detected in the southern surface water of Shijiazhuang and there was a stepwise decrease from the wet season to the dry season. Furthermore, based on source apportionment,the dominant potential sources were found to be wastewater treatment plant(WWTP) effluents and industrial discharge. The risk quotients(RQs) revealed low ecological risks of all PFAAs for aquatic organisms in Shijiazhuang surface water. Collectively, this study provided basic data for regulatory strategies for controlling PFAA pollutions in urban surface water.
基金Supported by the Olympic Games scientific research project of the General Administration of Sport of China No.2011A020the National Natural Science Foundation of China(No.61172007/F010810)
文摘OBJECTIVE:To observe the therapeutic effect of lumbar tender point deep tissue massage plus lumbar traction on chronic non-specific low back pain using change in pressure pain threshold,muscle hardness and pain intensity as indices.METHODS:We randomly divided 64 patients into a treatment group(32 cases) and a control group(32 cases).Two drop-outs occurred in each group.Patients in the treatment group received tender point deep tissue massage plus lumbar traction and patients in the control group received lumbar traction,alone.We used a tissue hardness meter/algometer and visual analog scale(VAS) to assess the pressure pain threshold,muscle hardness and pain intensity.RESULTS:Following treatment,we obtained the following results in the treatment and control groups,respectively:the pressure pain threshold difference was 1.5±0.8 and 1.1±0.7;the muscle hardness difference was 4.2±1.6 and 3.5±1.3;and the VAS score difference was 1.9±0.9 and 1.4±0.8.Compared to the control group,the treatment group had higher pressure pain threshold(t=2.09,P<0.05),and lower muscle hardness(t=2.05,P<0.05) and pain intensity(t=2.46,P<0.05).CONCLUSION:Lumbar tender point deep tissue massage combined with lumbar traction produced better improvement in pressure pain threshold,muscle hardness and pain intensity in patients with chronic non-specific low back pain than with lumbar traction alone.
