Geological disasters on the superficial seafloor were revealed in geological investigation on the Yellow River subaqueous delta. Combined with dynamic triaxial tests and wave flume experiments, occurring conditions an...Geological disasters on the superficial seafloor were revealed in geological investigation on the Yellow River subaqueous delta. Combined with dynamic triaxial tests and wave flume experiments, occurring conditions and forming patterns of liquefaction as well as motion of the liquefied soil were explained in this paper. Based on the viewpoint that the geological disasters were formed due to silty soil liquefaction under storm waves, re-stratification issue of the superficial stratum was analyzed. Movement of the liquefied soil agreed with the wave, leading to differentiation of the soil particles. Research issues in respect of geological, environment and engineering of storm-induced liquefaction were also discussed.展开更多
To evaluate the influence of wetland reclamation on vertical distribution of carbon and nitrogen in coastal wetland soils, we measured the soil organic carbon(SOC), soil total nitrogen(STN) and selected soil propertie...To evaluate the influence of wetland reclamation on vertical distribution of carbon and nitrogen in coastal wetland soils, we measured the soil organic carbon(SOC), soil total nitrogen(STN) and selected soil properties at five sampling plots(reed marsh, paddy field, corn field, forest land and oil-polluted wetland) in the Liaohe River estuary in September 2013. The results showed that reclamation significantly changed the contents of SOC and STN in the Liaohe River estuary(P < 0.001). The SOC concentrations were in the order: oil-polluted wetland > corn field > paddy field > forest land > reed marsh, with mean values of 52.17, 13.14, 11.46, 6.44 and 6.16 g/kg, respectively. STN followed a similar order as SOC, with mean values of 1351.14, 741.04, 632.32, 496.17 and 390.90 mg/kg, respectively. Interaction of reclamation types and soil depth had significant effects on SOC and STN, while soil depth had significant effects on SOC, but not on STN. The contents of SOC and STN were negatively correlated with pH and redox potential(Eh) in reed marsh and corn field, while the SOC and STN in paddy field had positive correlations with electrical conductivity(EC). Dissolved organic carbon(DOC), ammonium nitrogen(NH_4^+-N) and nitrate nitrogen(NO_3~–-N) were also significantly changed by human activities. NH_4^+-N and NO_3~–-N increased to different degrees, and forest land had the highest NO_3~–-N concentration and lowest DOC concentration, which could have been caused by differences in soil aeration and fertilization. Overall, the results indicate that reed harvest increased soil carbon and nitrogen release in the Liaohe River Estuary, while oil pollution significantly increased the SOC and STN; however, these cannot be used as indicators of soil fertility and quality because of the serious oil pollution.展开更多
Objective: To purify the natural antikeratin autoantibody (AK auto-Ab) and observe its effects on the prolif eration of the cultured keratinocytes. Methods: Natural AK auto-Ab was purified by using keratin affinity co...Objective: To purify the natural antikeratin autoantibody (AK auto-Ab) and observe its effects on the prolif eration of the cultured keratinocytes. Methods: Natural AK auto-Ab was purified by using keratin affinity column, and then the titre and specificity of the Abs were studied by ELISA, immunoperoxidase staining and immuno-electronicmicroscope. The effect of the purified Abs on the cultured keratino-cytes was assayed by 3H-TdR incorporation. Results: Natural AK auto-Ab was obtained. The binding activity of IgG AK auto-Ab in purified Ah remained similar to that in pooled human sera. and the specificity of the obtained antibody is strong. The purified antibody could decrease the Il-TdR incorporation of the cultured keratinocytes in a dose-dependent manner. Conclusion: The method of punning AK auto-Ab is simple, practicable and reliable. Natural AK auto-Ab, existing in normal human individuals, has inhibitory etiect on the proliferation of the cultured keratinocytes.展开更多
基金supported by National Science Foundation of China (No. 41076021)
文摘Geological disasters on the superficial seafloor were revealed in geological investigation on the Yellow River subaqueous delta. Combined with dynamic triaxial tests and wave flume experiments, occurring conditions and forming patterns of liquefaction as well as motion of the liquefied soil were explained in this paper. Based on the viewpoint that the geological disasters were formed due to silty soil liquefaction under storm waves, re-stratification issue of the superficial stratum was analyzed. Movement of the liquefied soil agreed with the wave, leading to differentiation of the soil particles. Research issues in respect of geological, environment and engineering of storm-induced liquefaction were also discussed.
基金Under the auspices of National Basic Research Program of China(No.2012CB956100)National Natural Science Foundation of China(No.41301085)
文摘To evaluate the influence of wetland reclamation on vertical distribution of carbon and nitrogen in coastal wetland soils, we measured the soil organic carbon(SOC), soil total nitrogen(STN) and selected soil properties at five sampling plots(reed marsh, paddy field, corn field, forest land and oil-polluted wetland) in the Liaohe River estuary in September 2013. The results showed that reclamation significantly changed the contents of SOC and STN in the Liaohe River estuary(P < 0.001). The SOC concentrations were in the order: oil-polluted wetland > corn field > paddy field > forest land > reed marsh, with mean values of 52.17, 13.14, 11.46, 6.44 and 6.16 g/kg, respectively. STN followed a similar order as SOC, with mean values of 1351.14, 741.04, 632.32, 496.17 and 390.90 mg/kg, respectively. Interaction of reclamation types and soil depth had significant effects on SOC and STN, while soil depth had significant effects on SOC, but not on STN. The contents of SOC and STN were negatively correlated with pH and redox potential(Eh) in reed marsh and corn field, while the SOC and STN in paddy field had positive correlations with electrical conductivity(EC). Dissolved organic carbon(DOC), ammonium nitrogen(NH_4^+-N) and nitrate nitrogen(NO_3~–-N) were also significantly changed by human activities. NH_4^+-N and NO_3~–-N increased to different degrees, and forest land had the highest NO_3~–-N concentration and lowest DOC concentration, which could have been caused by differences in soil aeration and fertilization. Overall, the results indicate that reed harvest increased soil carbon and nitrogen release in the Liaohe River Estuary, while oil pollution significantly increased the SOC and STN; however, these cannot be used as indicators of soil fertility and quality because of the serious oil pollution.
文摘Objective: To purify the natural antikeratin autoantibody (AK auto-Ab) and observe its effects on the prolif eration of the cultured keratinocytes. Methods: Natural AK auto-Ab was purified by using keratin affinity column, and then the titre and specificity of the Abs were studied by ELISA, immunoperoxidase staining and immuno-electronicmicroscope. The effect of the purified Abs on the cultured keratino-cytes was assayed by 3H-TdR incorporation. Results: Natural AK auto-Ab was obtained. The binding activity of IgG AK auto-Ab in purified Ah remained similar to that in pooled human sera. and the specificity of the obtained antibody is strong. The purified antibody could decrease the Il-TdR incorporation of the cultured keratinocytes in a dose-dependent manner. Conclusion: The method of punning AK auto-Ab is simple, practicable and reliable. Natural AK auto-Ab, existing in normal human individuals, has inhibitory etiect on the proliferation of the cultured keratinocytes.
