Boron−nitrogen doped multiple resonance(BN-MR)emitters,characterized by B−N covalent bonds,offer distinctive advantages as pivotal building blocks for facile access to novel MR emitters featuring narrowband spectra an...Boron−nitrogen doped multiple resonance(BN-MR)emitters,characterized by B−N covalent bonds,offer distinctive advantages as pivotal building blocks for facile access to novel MR emitters featuring narrowband spectra and high efficiency.However,there remains a scarcity of exploration concerning synthetic methods and structural derivations to expand the library of novel BN-MR emitters.Herein,we present the synthesis of a BN-MR emitter,tCz[B−N]N,through a one-pot borylation reaction directed by the amine group,achieving an impressive yield of 94%.The emitter is decorated by incorporating two 3,6-di-tbutylcarbazole(tCz)units into a B−N covalent bond doped BN-MR parent molecule via para-C−π−D and para-N−π−D conjugations.This peripheral decoration strategy enhances the reverse intersystem crossing process and shifts the emission band towards the pure green region,peaking at 526 nm with a narrowband full-width at half maximum(FWHM)of 41 nm.Consequently,organic light emitting diodes(OLEDs)employing this emitter achieved a maximum external quantum efficiency(EQEmax)value of 27.7%,with minimal efficiency roll-off.Even at a practical luminance of 1000 cd·m^(−2),the device maintains a high EQE value of 24.6%.展开更多
目的探讨血浆N末端B型钠尿肽前体(N-terminal pro-B-type natriuretic peptide,NTproBNP)在预测中重度支气管肺发育不良(bronchopulmonary dysplasia,BPD)风险中的临床价值。方法采用前瞻观察性研究方法,选择2021年6月—2022年12月福建...目的探讨血浆N末端B型钠尿肽前体(N-terminal pro-B-type natriuretic peptide,NTproBNP)在预测中重度支气管肺发育不良(bronchopulmonary dysplasia,BPD)风险中的临床价值。方法采用前瞻观察性研究方法,选择2021年6月—2022年12月福建省妇幼保健院新生儿科收治的胎龄<30周极/超早产儿95例。分别于出生后第1、7、14、21天检测NTproBNP水平并收集住院期间基本资料,根据美国国家儿童健康与人类发展研究所(National Institute of Child Health and Human Development,NICHD)诊断标准,分为无-轻度BPD组(n=74)和中-重度BPD组(n=21)。比较2组不同时间点NTproBNP水平。结果中-重度BPD组胎龄、出生体质量均低于无-轻度BPD组(P<0.05);中-重度BPD组胎膜早破>18 h、≥3级新生儿呼吸窘迫综合征(respiratory distress syndrome,RDS)、有创机械通气时间>7 d、症状性动脉导管未闭(symptomatic patent ductus arteriosus,sPDA)、晚发型败血症、早产儿视网膜病(retinopathy of prematurity,ROP)的发生率均高于无-轻度BPD组,差异有统计学意义(P<0.05)。无-轻度BPD组NTproBNP水平在出生后第1天最高,中-重度BPD组NTproBNP水平在出生后第7天最高,随后逐渐降低。中-重度BPD组各时间点NTproBNP水平均高于无-轻度BPD组,差异有统计学意义(P<0.05)。出生后第1天NTproBNP水平为5631.52 pg/mL,是中重度BPD最佳预测参考值,受试者工作特征(receiver operating characteristic,ROC)曲线下面积为0.89(95%CI0.83~0.95),诊断准确性为85.71%。结论出生后第1天NTproBNP水平有助于早期预测中重度BPD发病风险,动态监测NTproBNP趋势可能对疾病防治提供一定参考价值。展开更多
基金financial support from the National Natural Science Foundation of China(Nos.52303253 and 52273198)Yunnan Fundamental Research Project(No.202301BF070001-008)the Yunling Scholar Project of"Yunnan Revitalization Talent Support Program".
文摘Boron−nitrogen doped multiple resonance(BN-MR)emitters,characterized by B−N covalent bonds,offer distinctive advantages as pivotal building blocks for facile access to novel MR emitters featuring narrowband spectra and high efficiency.However,there remains a scarcity of exploration concerning synthetic methods and structural derivations to expand the library of novel BN-MR emitters.Herein,we present the synthesis of a BN-MR emitter,tCz[B−N]N,through a one-pot borylation reaction directed by the amine group,achieving an impressive yield of 94%.The emitter is decorated by incorporating two 3,6-di-tbutylcarbazole(tCz)units into a B−N covalent bond doped BN-MR parent molecule via para-C−π−D and para-N−π−D conjugations.This peripheral decoration strategy enhances the reverse intersystem crossing process and shifts the emission band towards the pure green region,peaking at 526 nm with a narrowband full-width at half maximum(FWHM)of 41 nm.Consequently,organic light emitting diodes(OLEDs)employing this emitter achieved a maximum external quantum efficiency(EQEmax)value of 27.7%,with minimal efficiency roll-off.Even at a practical luminance of 1000 cd·m^(−2),the device maintains a high EQE value of 24.6%.
文摘目的分析体质量指数(Body mass index,BMI)与老年慢性心力衰竭(Chronic heart failure,CHF)患者血浆胱抑素C(cystatinC,Cys-C)、N末端B型利钠肽原(N-terminal pro-B-type natriuretic peptide,NT-proBNP)水平相关性,并分析血浆Cys-C、NT-proBNP评估老年CHF患者预后价值。方法选择2021年7月—2022年10月在本院接受治疗的192例老年慢性心力衰竭(CHF)患者作为研究对象,按照BMI指数分为肥胖组(49例)、超重组(68例)和正常组(75例)三组。对比各亚组患者血浆Cys-C、NT-proBNP水平差异,采用Pearson相关性分析的方式探究老年CHF患者BMI指数与血浆Cys-C、NT-proBNP相关性,对入组患者实施12个月随访,将患者按照预后情况区分为死亡组和存活组,对比两亚组患者血浆Cys-C、NT-proBNP水平差异并评估预后评估价值。结果肥胖组患者血浆Cys-C、NT-proBNP水平高于超重组,超重组患者血浆Cys-C、NT-proBNP水平高于正常组,差异具有统计学意义(P<0.05);入组老年CHF患者的BMI指数与其血浆Cys-C、NT-proBN水平均呈现明显的正相关性(r=0.7104,P<0.0001)(r=0.6603,P<0.0001);随访12个月显示,死亡组患者的血浆Cys-C、NT-proBNP水平显著高于存活组患者,差异具有统计学意义(P<0.05);血浆Cys-C、NT-proBNP对老年CHF预后评估曲线下面积(area under curv,AUC)为0.6930(P=0.0009)、0.7982(P<0.0001)。结论老年CHF患者随BMI指数升高,血浆Cys-C、NT-proBNP水平逐渐升高,血浆Cys-C、NT-proBNP对老年CHF临床结局具有一定的预测价值,进一步研究有推广应用于老年CHF预后评估潜力。
文摘目的探讨血浆N末端B型钠尿肽前体(N-terminal pro-B-type natriuretic peptide,NTproBNP)在预测中重度支气管肺发育不良(bronchopulmonary dysplasia,BPD)风险中的临床价值。方法采用前瞻观察性研究方法,选择2021年6月—2022年12月福建省妇幼保健院新生儿科收治的胎龄<30周极/超早产儿95例。分别于出生后第1、7、14、21天检测NTproBNP水平并收集住院期间基本资料,根据美国国家儿童健康与人类发展研究所(National Institute of Child Health and Human Development,NICHD)诊断标准,分为无-轻度BPD组(n=74)和中-重度BPD组(n=21)。比较2组不同时间点NTproBNP水平。结果中-重度BPD组胎龄、出生体质量均低于无-轻度BPD组(P<0.05);中-重度BPD组胎膜早破>18 h、≥3级新生儿呼吸窘迫综合征(respiratory distress syndrome,RDS)、有创机械通气时间>7 d、症状性动脉导管未闭(symptomatic patent ductus arteriosus,sPDA)、晚发型败血症、早产儿视网膜病(retinopathy of prematurity,ROP)的发生率均高于无-轻度BPD组,差异有统计学意义(P<0.05)。无-轻度BPD组NTproBNP水平在出生后第1天最高,中-重度BPD组NTproBNP水平在出生后第7天最高,随后逐渐降低。中-重度BPD组各时间点NTproBNP水平均高于无-轻度BPD组,差异有统计学意义(P<0.05)。出生后第1天NTproBNP水平为5631.52 pg/mL,是中重度BPD最佳预测参考值,受试者工作特征(receiver operating characteristic,ROC)曲线下面积为0.89(95%CI0.83~0.95),诊断准确性为85.71%。结论出生后第1天NTproBNP水平有助于早期预测中重度BPD发病风险,动态监测NTproBNP趋势可能对疾病防治提供一定参考价值。
