Tomography of QLg in Sichuan-Yunnan Zone ZHOU, Lian‐Qing; ZHAO, Cui‐Ping; XIU, Ji‐Gang ...
Chinese journal of geophysics,
11/2008, Letnik:
51, Številka:
6
Journal Article
Recenzirano
In this study we obtained the tomography results of QLg in Sichuan‐Yunnan region, separately for each frequency, by using seismic wave data recorded by Yunnan and Sichuan seismic networks. The ...spatial resolution of our result is less than 100 km. Our results demonstrate that strong heterogeneity exists in the studied region, showing large difference between the highest and lowest Q value. The obvious high attenuation regions include the southeast edge of Sichuan‐Yunnan rhombic block, which extends from Xianshuihe fault zone to Anninghe fault zone, Simao‐Lancang‐Pu'e region, the Songpan‐Maowen region which is located to the west of Longmenshan fault zone, the Batang and Litang earthquake region. According to our result, high attenuation regions of Lg waves correspond to strong seismic active zones, ruptured area of large earthquakes, high terrestrial heat activity, and low velocity. It demonstrates that broken medium caused by strong tectonic activity or large earthquakes and heat flow upwelling along active faults may be the main reasons of low QLg in Sichuan‐Yunnan region. The obvious low attenuation regions include Sichuan basin, the eastern block of Yunnan region, and the middle part of Jinshajiang and Nujiang fault zones. The interior of Dianzhong block also shows lower attenuation than the nearby area. Low attenuation regions correspond to the stable tectonic block, weak tectonic activity and high velocity. It shows that low attenuation of Lg waves in Sichuan‐Yunnan region is correlated with small crustal deformation, low seismic activity, weak hydrothermal activities and stable block.
AIM: To investigate the protective effect and its mechanism of lycium barbarum polysaccharides(LBP)against oxidative stress-induced apoptosis in human retinal pigment epithelial cells.METHODS: ...ARPE-19 cells, a human retinal pigment epithelial cell lines, were exposed to different concentrations of H2O2 for 24h, then cell viability was measured by Cell Counting Kit-8(CCK-8) assay to get the properly concentration of H2O2 which can induce half apoptosis of APRE-19. With different concentrations of LBP pretreatment, the ARPE-19 cells were then exposed to appropriate concentration of H2O2, cell apoptosis was detected by flow cytometric analysis. Expression levels of Bcl-2 and Bax were measured by real time quantitative polymerase chain reaction(RT-PCR) technique.RSULTS: LBP significantly reduced the H2O2-induced ARPE-19 cells’ apoptosis. LBP inhibited the H2O2-induced down-regulation of Bcl-2 and up-regulation of Bax.CONCLUSION: LBP could protect ARPE-19 cells from H2O2-induced apoptosis. The Bcl-2 family had relationship with the protective effects of LBP.
Eddy current effects in a high field dipole Zhang, Man-Zhou; Zhang, Miao; Xie, Xiu-Cui ...
Nuclear science and techniques,
12/2017, Letnik:
28, Številka:
12
Journal Article
Recenzirano
Eddy currents produced by a time-varying magnetic field will introduce time delay and thus affect field quality. This effect leads to drifting of the beam position over time, especially for a compact ...synchrotron.Simulations and measurements of different dipoles have been performed, to investigate the time delay and field quality. The simulations are conducted using OPERA software. The measurements are conducted using a long coil and Hall sensor. All results show that the magnetic field deviation is up to 0.4% for the dipole with stainless steel endplates. The simulations show that the main sources of eddy current are the field saturation effect and the field component Bz, introduced by the bedstead-type coil. Field correction using a power supply is adopted to reduce the deviation to less than 0.02%.
AIM:To study the clinical efficacy of traditional Chinese medicine(TCM)intervention"tonifying the kidney to promote liver regeneration and repair by affecting stem cells and their ...microenvironment"("TTK")for treating liver failure due to chronic hepatitis B.METHODS:We designed the study as a randomized controlled clinical trial.Registration number of Chinese Clinical Trial Registry is Chi CTR-TRC-12002961.A total of 144 patients with liver failure due to infection with chronic hepatitis B virus were enrolled in this randomized controlled clinical study.Participants were randomly assigned to the following three groups:(1)a modern medicine control group(MMC group,36patients);(2)a"tonifying qi and detoxification"("TQD")group(72 patients);and(3)a"tonifying the kidney to promote liver regeneration and repair by affecting stem cells and their microenvironment"("TTK")group(36patients).Patients in the MMC group received general internal medicine treatment;patients in the"TQD"group were given a TCM formula"tonifying qi and detoxification"and general internal medicine treatment;patients in the"TTK"group were given a TCM formula of"TTK"and general internal medicine treatment.All participants were treated for 8 wk and then followed at 48 wk following their final treatment.The primaryefficacy end point was the patient fatality rate in each group.Measurements of various virological and biochemical indicators served as secondary endpoints.The one-way analysis of variance and the t-test were used to compare patient outcomes in the different treatment groups.RESULTS:At the 48-wk post-treatment time point,the patient fatality rates in the MMC,"TQD",and"TTK"groups were 51.61%,35.38%,and 16.67%,respectively,and the differences between groups were statistically significant(P<0.05).However,there were no significant differences in the levels of hepatitis B virus DNA or prothrombin activity among the three groups(P>0.05).Patients in the"TTK"group had significantly higher levels of serum total bilirubin compared to MMC subjects(339.40μmol/L±270.09μmol/L vs 176.13μmol/L±185.70μmol/L,P=0.014).Serum albumin levels were significantly increased in both the"TQD"group and"TTK"group as compared with the MMC group(31.30 g/L±4.77g/L,30.72 g/L±2.89 g/L vs 28.57 g/L±4.56 g/L,P<0.05).There were no significant differences in levels of alanine transaminase among the three groups(P>0.05).Safety data showed that there was one case of stomachache in the"TQD"group and one case of gastrointestinal side effect in the"TTK"group.CONCLUSION:Treatment with"TTK"improved the survival rates of patients with liver failure due to chronic hepatitis B.Additionally,liver tissue was regenerated and liver function was restored.
AIM:To observe effects of trabeculectomy with amniotic membrane transplantation(AMT) in controlling postoperative intraocular pressure(IOP) in patients with medically uncontrolled ...glaucoma.·METHODS:This study included adult patients with requiring bilateral glaucoma surgery.Each patient underwent trabeculectomy(Non-AMT group) in one eye and with AMT(AMT group) in the other eye according to randomized principle.Success was defined as intraocular pressure(IOP) <21mmHg without any anti-glaucoma medications at 24 months follow-up.The two groups were compared in terms of IOP,complications and success rate.·RESULTS:Thirty-four eyes of 17 patients were investigated in this study.There was no statistically signifcant difference in pre-operative IOP between the two groups.The mean IOP was lower in AMT group compared with Non-AMT group on follow up months 12,18,and 24.Postoperative complications were more frequent in Non-AMT group(35.3%,6/17) compared with AMT group(5.9%,1/17).The success rate of surgery was88.2%(15/17) in Non-AMT group and 100%(17/17) in AMT group.·CONCLUSION:Trabeculectomy with AMT is an effective procedure to reduce IOP and complications,thereby improving surgical success rates.
AIM: To investigate the association of lysyl oxidaselike 1(LOXL1) single nucleotide polymorphisms(SNPs)with exfoliation syndrome(XFS)/exfoliation glaucoma(XFG).METHODS: Published manuscripts from Pub ...Med and EMBASE were identified until May 2014. Summary odds ratios(ORs) and 95% confidence intervals(CIs) for LOXL1(rs1048661, rs2165241 and rs3825942) polymorphisms and the risk of XFS/XFG were estimated using random-or fixed- effect model.· RESULTS: The three LOXL1 polymorphisms(rs1048661, rs3825942, and rs2165241) were associated with an increased risk for XFS/XFG among Caucasians,with OR 2.19(1.96-2.45), 8.8(6.05-12.79) and 3.41(3.11-3.73), respectively. On the contrast, the rs1048661 and rs2165241, but not rs3825942 polymorphism, have a potential protective effect on XFS/XFG in Asians, with OR0.06(0.02-0.18), 0.15(0.09-0.25), respectively.CONCLUSION: There is strong evidence that LOXL1 polymorphisms are associated with XFS/XFG risk. The strength of risk might be ethnicity-dependent.
The development of an effective one‐photon excitation pathway to improve the charge‐carrier separation and mobility of semiconductors, which have been proven to be favorable for heterogeneous ...catalysis, is highly desirable but remains a great challenge. Herein, a high‐throughput one‐photon excitation pathway is reported by constructing 0D carbon dots/3D porous carbon nitride nanovesicles (denoted as CDs/PCN NVs) heterostructures for photocatalytic hydrogen evolution. In particular, the optimum CDs/PCN NVs heterostructures exhibit an impressive performance of 14.022 mmol h−1 g−1, which is 56.54 times higher than that of pristine CN. Detailed characterization reveals that the improved performance is primarily attributed to the high‐throughput and one‐photon excitation pathway. The former could be attributed to a great deal of CDs with high charge‐carrier mobility coupled to PCN NVs, which enable more electrons to be photoexcited via the broad absorption response, and the multiple reflection of incident light owing to the porous nanovesicle structure with shortened route of carriers migrating toward the surface; the latter would lead to the photoinduced holes and electrons accumulated at the valence band of PCN NVs and surface of CDs, respectively, achieving an effective spatial separation. The high‐throughput one‐photon excitation pathway demonstrated here may provide insights into the development of nanocomposites for various related applications.
A high‐throughput one‐photon excitation pathway is reported by constructing 0D carbon dots/3D porous carbon nitride nanovesicles (CDs/PCN NVs) heterostructures for visible‐light driven hydrogen evolution. In particular, the covalently bonded CDs on PCN NVs enable a high throughput charge migration in the wide spectrum visible light region and promote effective spatial separation via a one‐photon excitation pathway.
· AIM: To observe effects of trabeculectomy with amniotic membrane transplantation (AMT) in controlling postoperative intraocular pressure (IOP) in patients with medically uncontrolled glaucoma. ...·METHODS: This study included adult patients with requiring bilateral glaucoma surgery. Each patient underwent trabeculectomy (Non-AMT group) in one eye and with AMT (AMT group) in the other eye according to randomized principle. Success was defined as intraocular pressure (IOP) <21mmHg without any anti -glaucoma medications at 24 months follow -up. The two groups were compared in terms of IOP, complications and success rate. · RESULTS: Thirty -four eyes of 17 patients were investigated in this study. There was no statistically signifcant difference in pre -operative IOP between the two groups. The mean IOP was lower in AMT group compared with Non-AMT group on follow up months 12, 18, and 24. Postoperative complications were more frequent in Non-AMT group (35.3% , 6/17) compared with AMT group (5.9%, 1/17). The success rate of surgery was 88.2% (15/17) in Non -AMT group and 100% (17/17) in AMT group. · CONCLUSION: Trabeculectomy with AMT is an effective procedure to reduce IOP and complications, thereby improving surgical success rates.
Lithium-oxygen batteries with ultrahigh energy density have received considerable attention as of the future energy storage technologies. The development of effective electrocatalysts and a ...corresponding working mechanism during cycling are critically important for lithium-oxygen batteries. Here, a single cobalt atom electrocatalyst is synthesized for lithium-oxygen batteries by a polymer encapsulation strategy. The isolated moieties of single atom catalysts can effectively regulate the distribution of active sites to form micrometre-sized flower-like lithium peroxide and promote the decomposition of lithium peroxide by a one-electron pathway. The battery with single cobalt atoms can operate with high round-trip efficiency (86.2%) and long-term stability (218 days), which is superior to a commercial 5 wt% platinum/carbon catalyst. We reveal that the synergy between a single atom and the support endows the catalyst with excellent stability and durability. The promising results provide insights into the design of highly efficient catalysts for lithium-oxygen batteries and greatly expand the scope of future investigation.
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