Theoretical study of substituent effects on electride characteristics and the nonlinear optical properties of Li@calix[4]pyrrole

Electrides, a novel kind of ionic compound in which electrons serve as anions, have been proposed as potential second-order nonlinear optical (NLO) materials. In this work, the substituent effects on the electride characteristics and the NLO behaviour of Li@calix[4]pyrrole with an electride-like structure were studied theoretically. The results show that electron-donating and electron-withdrawing groups can effectively increase and decrease the first hyperpolarizability (β₀), respectively, without affecting the electride characteristics (electron population). More interestingly, lithiation in which four H atoms bonded to N atoms are substituted by four Li atoms within the core structure of Li@calix[4]pyrrole remarkably improves the electride characteristics, with a large electron population of 0.74 e (1.02 e) at the NNA (ELF) basins, making this structure perhaps the first formal molecular electride with almost one electron isolated from the rest of the molecules. Furthermore, a relationship between the electride characteristics and the NLO properties is found: the more delocalization the excess electron of the electride experiences, the larger the β₀ value is. The present investigation may provide useful information for exploring high-performance second-order nonlinear optical materials based on organic electrides.

A relationship between the electride characteristics and the NLO properties is found: the more delocalization the excess electron of the electride experiences, the larger the β₀ value is.     

Blood-based biomarkers for early detection of esophageal squamous cell carcinoma

Esophageal squamous cell carcinoma(ESCC) is a common malignant tumor of the digestive system worldwide, especially in China. Due to the lack of effective early detection methods, ESCC patients often present at an advanced stage at the time of diagnosis, which seriously affects the prognosis of patients. At present,early detection of ESCC mainly depends on invasive and expensive endoscopy and histopathological biopsy. Therefore, there is an unmet need for a noninvasive method to detect ESCC in the early stages. With the emergence of a large class of non-invasive diagnostic tools, serum tumor markers have attracted much attention because of their potential for detection of early tumors. Therefore, the identification of serum tumor markers for early detection of ESCC is undoubtedly one of the most effective ways to achieve early diagnosis and treatment of ESCC.This article reviews the recent advances in the discovery of blood-based ESCC biomarkers, and discusses the origins, clinical applications, and technical challenges of clinical validation of various types of biomarkers.     

Effect of DC-CIK cell on the proliferation,apoptosis and differentiation of leukemia cells

Objective:To observe the effect of co-culture cytokine-induced killer cells(CIK) and homologous dendritic cells(DC) on the proliferative activity and phenotype change of the DCCIK cell and the cell killing activity of leukemia HL-60.Methods:50 mL cord blood sample was obtained from infants delivered by full term healthy woman and the cord blood mononuclear cells were isolated by density gradient centrifugal ion.Non-adherent cells were collectedfor the induction culture of CIK.adherent cells were differentiated into mature DC;cultured mature DC was mixed with and CIK in the proportion of 1:5 for 12 d.killing activity of DC-CIK co-cultured cell on leukemia HL-60 was detected by MTT assay.Results:Compared with CIKs.the cocultured DC-CIKs presented a markedly higher proliferation and killing activity.Conclusions:Co-culture of DC-CIK cells led to a significant increase of the proliferation and cytotoxicity of CIK.     

超声检查评估克罗恩病活动性的价值

目的分析克罗恩病患者超声声像图特征,探讨超声检查评估克罗恩病活动性的价值。方法 2011年8月至2012年8月上海第十人民医院收治的克罗恩病患者25例。其中克罗恩病活动指数(CDAI)评分150分(缓解期)12例,150～450分(活动期)13例。每例患者均行内镜(结肠镜或小肠镜)检查、腹部超声检查。非炎性病变(缓解期)和炎症(活动期)肠段肠壁厚度比较采用两独立样本t检验。以内镜检查结果作为金标准,能量多普勒超声判断克罗恩病活动性与CDAI评分判断克罗恩病活动性的符合率比较采用χ2检验。结果 25例克罗恩病患者经内镜检查判断活动期20例,缓解期5例。所有患者均能获得满意的超声图像。本组超声诊断克罗恩病22例,诊断准确率为88%(22/25)。超声检测非炎性病变(缓解期)肠段肠壁厚度为(2.06±0.62)mm,低于炎症(活动期)肠段肠壁厚度(7.90±2.90)mm,且差异有统计学意义(t=2.53,P0.05)。本组25例克罗恩病患者能量多普勒超声判断缓解期7例,活动期18例。能量多普勒超声判断克罗恩病活动性的符合率为92%(23/25);而根据CDAI评分判断克罗恩病活动性的符合率仅为64%(16/25),低于能量多普勒超声判断克罗恩病活动性的符合率,且差异有统计学意义(χ2=9.39,P0.05)。超声检查发现腹腔脓肿1例,腹腔淋巴结肿大7例,腹腔积液2例。结论超声检查对肠壁厚度、结构层次、回声及肠外并发症的观察具有一定的优势,能准确评估克罗恩病活动性,对克罗恩病的诊治具有指导意义。     

2017年-2018年某三甲综合医院病案归档措施实施前后的效果分析

目的分析广东省惠州市某三甲综合医院病案归档措施实施前后的效果,探讨病案归档管理的有效实施方法和效果,为医院病案管理质量持续改进与提升提供依据。方法对2017年1月1日-2018年12月31日期间某院的172606份归档病案资料进行回顾性研究。将实施改进措施前的2017年的84459份归档病案,与实施一系列行之有效的改进措施后的2018年的87147份归档病案相互比较,对比结果进行整理、归类与统计分析。结果实施后的2日、3日、7日病案归档率为50.3%、67.0%、95.6%,实施前的病案归档率分别为31.9%、45.1%、86.8%,二者相比,差异具有统计学意义。其中实施后的第4季度7日病案归档率达到最高值97.4%。某院的病案归档管理的改进措施成效明显。结论某院在实施一系列整改措施后,优化病案归档全流程闭环管理,明显改善病案延迟归档现状,有效促进医院2日、3日、7日病案归档率明显提升,持续改进医院病案管理质量和水平。