目的探讨急性呼吸窘迫综合征(ARDS)机械通气患者呼出气冷凝液(EBC)中过氧化氢(H2O2)和白介素6(IL-6)水平变化及其临床意义。方法选取2012年9月—2013年12月贵阳医学院附属医院内科重症监护病房(MICU)收治的ARDS患者42例,均经气管插管或...目的探讨急性呼吸窘迫综合征(ARDS)机械通气患者呼出气冷凝液(EBC)中过氧化氢(H2O2)和白介素6(IL-6)水平变化及其临床意义。方法选取2012年9月—2013年12月贵阳医学院附属医院内科重症监护病房(MICU)收治的ARDS患者42例,均经气管插管或气管切开进行机械通气治疗。按患者入住MICU两周后转归分为存活组22例和死亡组20例,比较两组患者机械通气后1、3、5、7 d急性生理学及慢性健康状况(APACHE)Ⅱ评分、APACHEⅢ评分及EBC中H2O2、IL-6水平,分析两组患者机械通气后1、3、5、7 d APACHEⅡ评分、APACHEⅢ评分与EBC中H2O2、IL-6水平的相关性。结果 (1)存活组患者机械通气后3、5、7 d EBC中H2O2和IL-6水平低于机械通气后1 d,死亡组患者机械通气后7 d EBC中H2O2和IL-6水平高于机械通气后1、3、5 d(P<0.05)。(2)机械通气后1 d两组患者APACHEⅡ和APACHEⅢ评分比较,差异无统计学意义(P>0.05);机械通气后3、5、7 d死亡组患者APACHEⅡ和APACHEⅢ评分高于存活组(P<0.05)。(3)械通气后1、3 d两组患者EBC中H2O2和IL-6水平比较,差异无统计学意义(P>0.05);机械通气后5、7 d死亡组患者EBC中H2O2和IL-6水平均高于存活组(P<0.05)。(4)存活组患者机械通气后不同时间点EBC中H2O2和IL-6水平与APACHEⅡ和APACHEⅢ评分间无直线相关关系(P>0.05);死亡组患者机械通气后5、7 d EBC中H2O2水平与APACHEⅡ和APACHEⅢ评分呈正相关,EBC中IL-6水平与APACHEⅡ和APACHEⅢ评分呈负相关(P<0.05)。结论 ARDS机械通气患者EBC中H2O2和IL-6水平均升高,且与病情严重程度相关,其可作为气道炎性反应的监测指标,结合APACHE评分可为评估患者预后提供参考。展开更多
Three chiral aminopyridine ligands derived from L-proline were prepared. Careful evaluation of the corresponding aminopyridine manganese complexes in asymmetric epoxidation of olefins revealed a broad substrate scope ...Three chiral aminopyridine ligands derived from L-proline were prepared. Careful evaluation of the corresponding aminopyridine manganese complexes in asymmetric epoxidation of olefins revealed a broad substrate scope in the presence of 0.2 mol% manganese complex and 0.5 equiv. 2,2-dimethylbutyric acid, with aqueous hydrogen peroxide as an oxidant. A variety of olefins including styrenes, chromenes, and cinnamamides were transformed successfully into the target epoxides with moderate to excellent enantioselectivity（yield up to 95%, ee up to 99%）.展开更多
Although the oxygen reduction process to hydrogen peroxide(H_(2)O_(2))is a green option for H_(2)O_(2)generation,the low activity and selectivity hindered the industry's process.In recent years,the electrochemical...Although the oxygen reduction process to hydrogen peroxide(H_(2)O_(2))is a green option for H_(2)O_(2)generation,the low activity and selectivity hindered the industry's process.In recent years,the electrochemical synthesis of H_(2)O_(2)through a 2e-transfer method of oxygen reduction reaction(ORR)has piqued the interest of both academics and industry.Metal oxide catalysts have emerged as a novel family of electrochemical catalysts due to their unusual physical,chemical,and electrical characteristics.In this work,we first developed a Ruddlesden-Popper perovskite oxide(Pr_(2)NiO_(4+δ))as a highly selective and active catalyst for 2e-ORR to produce H_(2)O_(2).Molybdenum was introduced here to adjust the oxidation states of these transition metals with successful substitution into Ni-site to prepare Pr_(2)Ni1-xMoxO_(4+δ),and the molybdenum substitution improves the H_(2)O_(2)selectivity during the ORR process,in 0.1 M KOH,from 60%of Pr_(2)NiO_(4+δ)to 79%of Pr_(2)Ni_(0.8)Mo_(0.2)O_(4+δ)at 0.55 V versus RHE.A limiting H_(2)O_(2)concentration of_0.24 mM for Pr_(2)NiO_(4+δ)and 0.42 mM for Pr_(2)Ni_(0.8)Mo_(0.2)O_(4+δ)was obtained at a constant current of 10 mA/cm2 using a flow-cell reactor using a gas-diffusion electrode.展开更多
文摘目的探讨急性呼吸窘迫综合征(ARDS)机械通气患者呼出气冷凝液(EBC)中过氧化氢(H2O2)和白介素6(IL-6)水平变化及其临床意义。方法选取2012年9月—2013年12月贵阳医学院附属医院内科重症监护病房(MICU)收治的ARDS患者42例,均经气管插管或气管切开进行机械通气治疗。按患者入住MICU两周后转归分为存活组22例和死亡组20例,比较两组患者机械通气后1、3、5、7 d急性生理学及慢性健康状况(APACHE)Ⅱ评分、APACHEⅢ评分及EBC中H2O2、IL-6水平,分析两组患者机械通气后1、3、5、7 d APACHEⅡ评分、APACHEⅢ评分与EBC中H2O2、IL-6水平的相关性。结果 (1)存活组患者机械通气后3、5、7 d EBC中H2O2和IL-6水平低于机械通气后1 d,死亡组患者机械通气后7 d EBC中H2O2和IL-6水平高于机械通气后1、3、5 d(P<0.05)。(2)机械通气后1 d两组患者APACHEⅡ和APACHEⅢ评分比较,差异无统计学意义(P>0.05);机械通气后3、5、7 d死亡组患者APACHEⅡ和APACHEⅢ评分高于存活组(P<0.05)。(3)械通气后1、3 d两组患者EBC中H2O2和IL-6水平比较,差异无统计学意义(P>0.05);机械通气后5、7 d死亡组患者EBC中H2O2和IL-6水平均高于存活组(P<0.05)。(4)存活组患者机械通气后不同时间点EBC中H2O2和IL-6水平与APACHEⅡ和APACHEⅢ评分间无直线相关关系(P>0.05);死亡组患者机械通气后5、7 d EBC中H2O2水平与APACHEⅡ和APACHEⅢ评分呈正相关,EBC中IL-6水平与APACHEⅡ和APACHEⅢ评分呈负相关(P<0.05)。结论 ARDS机械通气患者EBC中H2O2和IL-6水平均升高,且与病情严重程度相关,其可作为气道炎性反应的监测指标,结合APACHE评分可为评估患者预后提供参考。
基金supported by the National Natural Science Foundation of China(21473226,21773273)Key Research Program of Frontier Sciences,CAS(QYZDJ-SSW-SLH051)Natural Science Foundation of Jiangsu Province(BK20170420)~~
文摘Three chiral aminopyridine ligands derived from L-proline were prepared. Careful evaluation of the corresponding aminopyridine manganese complexes in asymmetric epoxidation of olefins revealed a broad substrate scope in the presence of 0.2 mol% manganese complex and 0.5 equiv. 2,2-dimethylbutyric acid, with aqueous hydrogen peroxide as an oxidant. A variety of olefins including styrenes, chromenes, and cinnamamides were transformed successfully into the target epoxides with moderate to excellent enantioselectivity（yield up to 95%, ee up to 99%）.
基金The authors are grateful for the FWO(12ZV320N)and NNSF(22005250).O.M.M.thanks CONACYT-Mexico.K.W.is grateful to Guangzhou Elite Project.W.Z.,W.G,S.X.,and Q.L.are grateful to CSC.
文摘Although the oxygen reduction process to hydrogen peroxide(H_(2)O_(2))is a green option for H_(2)O_(2)generation,the low activity and selectivity hindered the industry's process.In recent years,the electrochemical synthesis of H_(2)O_(2)through a 2e-transfer method of oxygen reduction reaction(ORR)has piqued the interest of both academics and industry.Metal oxide catalysts have emerged as a novel family of electrochemical catalysts due to their unusual physical,chemical,and electrical characteristics.In this work,we first developed a Ruddlesden-Popper perovskite oxide(Pr_(2)NiO_(4+δ))as a highly selective and active catalyst for 2e-ORR to produce H_(2)O_(2).Molybdenum was introduced here to adjust the oxidation states of these transition metals with successful substitution into Ni-site to prepare Pr_(2)Ni1-xMoxO_(4+δ),and the molybdenum substitution improves the H_(2)O_(2)selectivity during the ORR process,in 0.1 M KOH,from 60%of Pr_(2)NiO_(4+δ)to 79%of Pr_(2)Ni_(0.8)Mo_(0.2)O_(4+δ)at 0.55 V versus RHE.A limiting H_(2)O_(2)concentration of_0.24 mM for Pr_(2)NiO_(4+δ)and 0.42 mM for Pr_(2)Ni_(0.8)Mo_(0.2)O_(4+δ)was obtained at a constant current of 10 mA/cm2 using a flow-cell reactor using a gas-diffusion electrode.
