Two open metal sites on the same metal: Dynamics of CO_(2) in MOF UTSA-74--Dedicated to Professor Xiuwen Han on the occasion of her 80th birthday

Metal-organic frameworks(MOFs)are an emerging dass of porous materials with many unique properties that make them promising candidates for carbon dioxide(CO_(2))capture and storage.A better understanding of the behavior of CO_(2) adsorbed inside MOF will enable researchers to develop the ability of designing new MOF based materials with high CO_(2) adsorption capabilities.It is well known that presence of open metal sites(OMSs)can greatly enhance the gas adsorption capability of MOFs.MOF UTSA-74,a framework isomer of well-known MOF-74 has a unique feature that upon activation,a single metal ion has two OMSs.Therefore,it presents a unique opportunity to probe the dynamics of CO_(2) molecules adsorbed on these OMSs.In this work,the CO_(2) adsorptive properties of MOF UTSA-74 are examined with particular attention being paid to the dynamics of the CO_(2) adsorbed on these OMSs.Specifically,variable temperature 13C static solid-state nuclear magnetic resonance(SSNMR)experiments were conducted to directly monitor the behavior of BCO_(2) in UTSA-74 at different loadings.All CO_(2) molecules undergo localized wobbling.At low loadings,some CO_(2) molecules jump among three OMSs from three different Zn atoms in the cOsS section of the channel.Others hop back and forth between the two neighboring OMSs.At high loading,the three site jump has ceased,but two-site hopping persists.The dynamical behavior of CO_(2) in UTSA-74 results from the unique Zn coord ination environment It was discovered that CO_(2) is less mobile in UTSA-74 than in its.framework isomer,MOF-74-Zn.

多声学技术参数联合血清学指标对非酒精性脂肪性肝病肝脂肪变性阶段的诊断价值

目的探讨多声学技术参数对非酒精性脂肪性肝病(NAFLD)脂肪变性阶段的诊断效能,并进一步探讨声学技术参数联合血清学参数是否能提高其诊断效能。方法从2020年6月至2021年12月前瞻性连续入组在浙江大学医学院附属第二医院就诊的临床可疑NAFLD并行肝穿刺活检的病例。所有病例穿刺前均经过衰减成像(ATI)、归一化局部方差(NLV)、肝肾强度对比(Ratio)值等肝多声学技术参数检查,同时收集患者临床背景数据和血清学数据。以病理结果为金标准,采用Spearman秩相关分析评估多声学技术参数和临床参数与肝脂肪变性之间的相关性,绘制受试者操作特征曲线评价多声学技术参数对肝脂肪变性的诊断效能,并探索最佳声学技术参数与血清学参数联合是否能提高NAFLD肝脂肪变性的诊断效能。结果本研究共纳入病例75例,其中肝脂肪变性分级S0、S1、S2、S3级分别为15、41、13、6例。肝脂肪变性分级与声学技术参数衰减系数(AC)值、Ratio值呈显著正相关(相关系数r=0.519、0.285,P<0.001、=0.016),与声学技术参数NLV、NLV的标准差(NLV-SD)呈显著负相关(r=-0.391、-0.356,P=0.001、0.002)。当AC值<0.62 dB/(cm·MHz)或谷草转氨酶(AST)<18 IU/L时,ATI和AST并联诊断肝脂肪变性≥S1级的曲线下面积(AUC)为0.864(95%CI:0.765~0.933),其敏感度和特异度分别为91.5%、80.0%;当AC>0.75 dB/(cm·MHz)且AST>25 IU/L时,ATI和AST串联诊断肝脂肪变性≥S2级的AUC为0.761(95%CI:0.645~0.854),其敏感度和特异度分别为55.6%、92.5%。结论在NAFLD患者中,声学技术参数AC、NLV、NLV-SD、Ratio值均在诊断肝脂肪变性分级中具有一定的价值。将AC值和血清学指标AST并联诊断可以进一步提高肝脂肪变性≥S1级的诊断效能,而AC值和AST串联诊断可以进一步提高肝脂肪变性≥S2级的诊断效能。

Epidemic transition of environmental health risk during China's urbanization

China has experienced rapid urbanization in recent decades along with dramatic economic growth.Previous studies have shown that urbanization has both positive and negative effects on health.However, there is a lack of research on the overall effects of urbanization on the epidemic transition of environmental health risks considering various pathways in China. In the present study, we studied the contributions of different aspects of urbanization in China to epidemic transitions using provincial and multi-year(1995, 2000, 2005, and 2010) panel data. Statistical models with fixed and random effects were developed to explore the impacts of different urbanization indicators on the overall epidemic transition of environmental health(general model) and the changes in cause-specific mortality rates of typical diseases(cause-specific models). The results show that the impacts of non-communicable diseases continue to grow during the urbanization process in China. The ratio of communicable disease-related mortality to non-communicable disease-related mortality continues to decrease over time. The general model shows that the improved medical conditions(coefficient = 0.0011, P = 0.037), the improved urban infrastructure(e.g., tap water supply)(coefficient = 0.00065, P < 0.001), and the rise in income(coefficient = 0.00027, P = 0.047) during the urbanization process are important factors that promote this overall epidemic transition. The cause-specific models show that the mechanisms behind the general model are complicated. More attention should be paid to non-communicable diseases in urban health management. Specific health policies for different diseases should incorporate the considerations of different impact pathways of urbanization.

In vivo evaluation of urokinase-loaded hollow nanogels for sonothrombolysis on suture embolization-induced acute ischemic stroke rat model

The urokinase-type plasminogen activator(uPA)loaded hollow nanogels(nUK)were synthesized by a one-step reaction of glycol chitosan and aldehyde capped poly(ethylene oxide).The resultant formulation is sensitive to diagnostic ultrasound(US)of 2 MHz.Herein,we evaluated the in vivo sonothrombolysis performance of the nUK on acute ischemic stroke rat model which was established by suture embolization of middle cerebral artery(MCA).Via intravenous(i.v.)administration,the experimental data prove a controlled release of the therapeutic protein around the clots under ultrasound stimulation,leading to enhanced thrombolysis efficiency of the nUK,evidenced from smaller infarct volume and better clinical scores when compared to the i.v.dose of free uPA no matter with or without US intervention.Meanwhile,the preservation ability of the nanogels not only prolonged the circulation duration of the protein,but also resulted in the better blood-brain barrier protection of the nUK formulation,showing no increased risk on the hemorrhagic transformation than the controls.This work suggests that the nUK is a safe sonothrombolytic formulation for the treatment of acute ischemic stroke.

Sphingolipids Profiling of Plasma in Patients with Diabetes Mellitus Associated with Atherosclerosis by a Novel Normal-Phase UPLC-QToF MS Method

A novel normal-phase UPLC-QToF MS method was developed for sphingolipids analysis,which was then applied to separate and identify seven classes of sphingolipids in plasma.The time-consuming of this novel method was much shorter than previous 2D LC–MS method,while the sensitivity,repeatability and resolution for sphingolipids analysis were better or comparable.Besides,the differences of lipids in human plasma among diabetes mellitus patients,diabetes mellitus associated with atherosclerosis patients and control subjects were also compared.Finally,12 sphingolipids species were identified as the amounts of which in diabetes mellitus associated with atherosclerosis patients were significantly higher than them in diabetes mellitus patients(VIP>1.0,p value<0.05,fold change>1.5).As the isomers of GalCs and GluCs were successfully separated,it was found that five GluCs,rather than GalCs,were included in these 12 potential biomarkers.These results suggest the need to separate GalCs from GluCs,and also indicated that there may be some extra activation pathways of diabetes mellitus associated with atherosclerosis,different from the atherosclerosis pathway and the diabetes mellitus pathway,causing cardiovascular disease.