Is it possible to advise either for or against prophylactic anticoagulation in patients following Fontan surgery? Certainly, the evidence suggests that thromboembolism is a major risk factor and it may therefore be co...Is it possible to advise either for or against prophylactic anticoagulation in patients following Fontan surgery? Certainly, the evidence suggests that thromboembolism is a major risk factor and it may therefore be considered reasonable to anticoagulate all patients. However, key information is missing regarding the safety and benefit from aspirin and warfarin treatment, as well as target international normalised ratio(INR) levels and timing of therapy. Consequently, if we are to subscribe to an evidence based approach, a blanket recommendation cannot be given. Nevertheless, if a high risk group is to be identified, patients with progressive right atrial dilatation and/or a history of atrial arrhythmia would appear, albeit anecdotally, to present the strongest case for prophylactic anticoagulation. Clearly, prospective controlled studies are required before definitive recommendations can be made.展开更多
Trichloroethylene （TCE）, as one of the most common chlorinated organic compounds in soils and aquifers at many industrial sites, is carcinogenic and often recalcitrant in environment. TCE degradation in artificially...Trichloroethylene （TCE）, as one of the most common chlorinated organic compounds in soils and aquifers at many industrial sites, is carcinogenic and often recalcitrant in environment. TCE degradation in artificially contaminated soil samples was conducted using Fenton-like processes, i.e., by addition of excess hydrogen peroxide （H2O2）. H2O2 could directly oxidize TCE without addition of ferrous iron in contaminated soil. Under the optimal condition （H2O2 concentration of 300 mg kg^-1, pH at 5.0, and reaction time of 30 rain）, the removal efficiency of TCE in the soil was up to 92.3%. When the initial TCE concentration increased from 30 to 480 mg kg^-1 in soil, the TCE removal rates varied from 89.2% to 86.6%; while the residual TCE in soil ranged from 2.28 to 47.57 mg kg^-1. Results from successive oxidations showed that the TCE removal rate with the TCE concentration of 180 mg kg^-1 increased slightly from 91.6% to 96.2% as the number of successive oxidation cycle increased from one to four. Therefore, increasing the frequency of H2O2 oxidation was perhaps a feasible way to increase TCE removal rate for TCE-contaminated soil.展开更多
文摘Is it possible to advise either for or against prophylactic anticoagulation in patients following Fontan surgery? Certainly, the evidence suggests that thromboembolism is a major risk factor and it may therefore be considered reasonable to anticoagulate all patients. However, key information is missing regarding the safety and benefit from aspirin and warfarin treatment, as well as target international normalised ratio(INR) levels and timing of therapy. Consequently, if we are to subscribe to an evidence based approach, a blanket recommendation cannot be given. Nevertheless, if a high risk group is to be identified, patients with progressive right atrial dilatation and/or a history of atrial arrhythmia would appear, albeit anecdotally, to present the strongest case for prophylactic anticoagulation. Clearly, prospective controlled studies are required before definitive recommendations can be made.
基金Supported by the Ministry of Environmental Protection of China(No.201109020)
文摘Trichloroethylene （TCE）, as one of the most common chlorinated organic compounds in soils and aquifers at many industrial sites, is carcinogenic and often recalcitrant in environment. TCE degradation in artificially contaminated soil samples was conducted using Fenton-like processes, i.e., by addition of excess hydrogen peroxide （H2O2）. H2O2 could directly oxidize TCE without addition of ferrous iron in contaminated soil. Under the optimal condition （H2O2 concentration of 300 mg kg^-1, pH at 5.0, and reaction time of 30 rain）, the removal efficiency of TCE in the soil was up to 92.3%. When the initial TCE concentration increased from 30 to 480 mg kg^-1 in soil, the TCE removal rates varied from 89.2% to 86.6%; while the residual TCE in soil ranged from 2.28 to 47.57 mg kg^-1. Results from successive oxidations showed that the TCE removal rate with the TCE concentration of 180 mg kg^-1 increased slightly from 91.6% to 96.2% as the number of successive oxidation cycle increased from one to four. Therefore, increasing the frequency of H2O2 oxidation was perhaps a feasible way to increase TCE removal rate for TCE-contaminated soil.
