The process of peroxide bleaching of Populus tomentosa kraft pulp with H2O2 pretreatment under acid condition was studied. The variations of pulp characteristics such as brightness, Kappa number and viscosity during t...The process of peroxide bleaching of Populus tomentosa kraft pulp with H2O2 pretreatment under acid condition was studied. The variations of pulp characteristics such as brightness, Kappa number and viscosity during the peroxide bleaching process were discussed and the concept of the A/B value was presented for the first time. The results show that acid pretreatment with H2O2 is essential to improve pulp brightness and avoid viscosity loss. The conclusion is reached that the A/B value has great influence on pulp properties when the total amount of peroxide used in the bleaching process is 2%-5%. Pulp with a high viscosity and brightness can be obtained when A/B is about 0.15.展开更多
目的观察替格瑞洛联合替罗非班对急性ST段抬高型心肌梗死患者急诊PCI术后心肌再灌注的作用及安全性。方法选取2013年4月-2018年6月于郑州市第二人民医院心内科行急诊PCI术的急性ST段抬高型心肌梗死患者(STEMI)300例,随机分为对照组140...目的观察替格瑞洛联合替罗非班对急性ST段抬高型心肌梗死患者急诊PCI术后心肌再灌注的作用及安全性。方法选取2013年4月-2018年6月于郑州市第二人民医院心内科行急诊PCI术的急性ST段抬高型心肌梗死患者(STEMI)300例,随机分为对照组140例及观察组160例。对照组病人给予阿司匹林+氯吡格雷+替罗非班治疗,观察组病人给予阿司匹林+替格瑞洛+替罗非班治疗。比较两组病人术后冠脉再灌注指标,术后2 h ST段回落﹥50%比例,术后6 h、12 h肌酸激酶同工酶(CK-MB),术后12 h血小板计数及血小板聚集率,可溶性CD40L(sCD40L)、基质金属蛋白酶-9(MMP-9),术后4周心功能(LVEF%),随访两组患者术后半年内主要不良心脏事件(MACE)及出血并发症发生情况。结果两组术后校正TIMI帧数(CTFC)较术前均有所改善,观察组改善程度显著优于对照组(P<0.05);观察组PCI术后梗死冠脉TIMI3级比例、术后2hST段回落﹥50%比例高于对照组[56/65(91.8%)VS 49/60(81.7%);55/65(76.9%)VS 35/60(58.3%),(P<0.05)];两组术后6 h及12 h CK-MB、术后12 h血小板计数及血小板聚集率比较有统计学差异(P<0.05);观察组术后12 h sCD40L、MMP-9水平低于对照组(100.45±25.82 VS 132.51±40.12;0.78±0.47 VS 1.24±0.85;P<0.05);术后1周、4周、6个月LVEF、RS、LS有统计学差异(P<0.05);术后半年内观察组MACE发生率显著低于对照组(P<0.05)。两组组消化道出血、皮肤黏膜出血、颅内出血等出血并发症差异无统计学意义(P>0.05)。结论替罗非班可有效改善老年DM-AMI患者PCI术后心肌再灌注,抑制炎症因子,改善心功能,降低术后不良心血管事件的发生。展开更多
文摘The process of peroxide bleaching of Populus tomentosa kraft pulp with H2O2 pretreatment under acid condition was studied. The variations of pulp characteristics such as brightness, Kappa number and viscosity during the peroxide bleaching process were discussed and the concept of the A/B value was presented for the first time. The results show that acid pretreatment with H2O2 is essential to improve pulp brightness and avoid viscosity loss. The conclusion is reached that the A/B value has great influence on pulp properties when the total amount of peroxide used in the bleaching process is 2%-5%. Pulp with a high viscosity and brightness can be obtained when A/B is about 0.15.
文摘目的观察替格瑞洛联合替罗非班对急性ST段抬高型心肌梗死患者急诊PCI术后心肌再灌注的作用及安全性。方法选取2013年4月-2018年6月于郑州市第二人民医院心内科行急诊PCI术的急性ST段抬高型心肌梗死患者(STEMI)300例,随机分为对照组140例及观察组160例。对照组病人给予阿司匹林+氯吡格雷+替罗非班治疗,观察组病人给予阿司匹林+替格瑞洛+替罗非班治疗。比较两组病人术后冠脉再灌注指标,术后2 h ST段回落﹥50%比例,术后6 h、12 h肌酸激酶同工酶(CK-MB),术后12 h血小板计数及血小板聚集率,可溶性CD40L(sCD40L)、基质金属蛋白酶-9(MMP-9),术后4周心功能(LVEF%),随访两组患者术后半年内主要不良心脏事件(MACE)及出血并发症发生情况。结果两组术后校正TIMI帧数(CTFC)较术前均有所改善,观察组改善程度显著优于对照组(P<0.05);观察组PCI术后梗死冠脉TIMI3级比例、术后2hST段回落﹥50%比例高于对照组[56/65(91.8%)VS 49/60(81.7%);55/65(76.9%)VS 35/60(58.3%),(P<0.05)];两组术后6 h及12 h CK-MB、术后12 h血小板计数及血小板聚集率比较有统计学差异(P<0.05);观察组术后12 h sCD40L、MMP-9水平低于对照组(100.45±25.82 VS 132.51±40.12;0.78±0.47 VS 1.24±0.85;P<0.05);术后1周、4周、6个月LVEF、RS、LS有统计学差异(P<0.05);术后半年内观察组MACE发生率显著低于对照组(P<0.05)。两组组消化道出血、皮肤黏膜出血、颅内出血等出血并发症差异无统计学意义(P>0.05)。结论替罗非班可有效改善老年DM-AMI患者PCI术后心肌再灌注,抑制炎症因子,改善心功能,降低术后不良心血管事件的发生。
