RNA聚合酶Ⅱ启动子SMP8在活化肝星状细胞中的活性

我们已往的研究已经证实,RNA聚合酶Ⅲ启动子(pol Ⅲ)载体表达的针对TGF β1的核酶,在体外能有效逆转活化HSC的生物学活性[1].但TGF β1是广泛存在于各种细胞中,并发挥重要生物学效应的细胞因子,因此不具组织和细胞特异性的pol Ⅲ启动子核酶表达系统,在抑制HSC活化的同时会影响到正常肝细胞或其他细胞的功能,这使得基因治疗肝纤维化变得困难.     

NT-proBNP对STEMI患者急诊PCI术后临床结果的预测价值

目的探讨N-末端脑钠肽前体(NT-proBNP)对ST段抬高型急性心肌梗死(STEMI)患者急诊经皮冠脉介入(PCI)术后临床结果的预测价值。方法选取2018年10月~2019年3月在某院行急诊PCI术的40例STEMI患者进行研究,采用酶联免疫吸附法检测患者NT-proBNP水平,同时采用超声心动图检测患者左室射血分数(LVEF)、左室收缩末期容积指数(LVESVI)、左室舒张末期容积指数(LVEDVI),随访6个月,根据患者是否出现心血管事件分为甲组(n=30,未出现心血管事件)与乙组(n=10,出现心血管事件),对两组一般资料以及入院时、术后1周、1个月、3个月和6个月的NT-proBNP水平、LVEF、LVESVI、LVEDVI进行统计比较。结果两组性别、年龄、高血压数据比较差异不显著(P>0.05);甲组前壁心肌梗死、糖尿病发病率及入院时NT-proBNP水平均低于乙组,差异有统计学意义(P<0.05)。术后1个月和3个月,甲组NT-proBNP水平、LVESVI均低于乙组,LVEF高于乙组,差异有统计学意义(P<0.05);在LVEDVI方面,两组比较无显著差异(P>0.05)。结论STEMI患者急诊PCI术后NT-proBNP水平显著降低,且对心血管事件发生有着一定的预测价值。     

哈萨克族成人指骨长度的X线测量及其与身高的性别判别

目的 探讨新疆哈萨克族成人指骨长度与身高的依存关系。方法 随机选择健康哈萨克族成人200人（男100人,女100人）,进行双手后前位X线拍片,分别测量各节指骨长度和对应的身高。计算各节指骨长度的均值、标准差和标准误,并且从各节指骨长度推断身高的性别判别方程。结果 男性和女性各节指骨长度之间的差异有统计学意义（P＜0.01）。经相关分析建立了哈萨克族成人指骨长度推断身高的4个性别判别方程（Y₁＝0.780ZM₁＋3.146YM₂＋1.594YS₁＋0.618ZS₃＋0.045YX₁＋1.891ZX₁＋2.548ZX₃-135.324, Y₂＝0.3450ZM₁＋2.328YM₂＋1.814YS₁＋1.355ZS₃＋0.714YX₁＋1.461ZX₁＋1.580ZX₃-118.678, Y₃＝3.540SG＋0.859YM₂-1.882ZS₂＋0.640YZ₁-5.598YZ₂＋5.794ZZ₂＋0.807YZ₃＋0.695ZX₁-391.229, Y₄＝3.284SG＋0.313YM₂-1.595ZS₂＋1.113YZ₁-3.869YZ₂＋4.959ZZ₂＋5.244YZ₃＋0.353ZX₁-340.001）。 结论 所得性别判别式对法医学性别判别应用价值较大,为体质人类学和法医学提供了有关新疆哈萨克族人的解剖学资料。     

Optical optimization of double-side-textured monolithic perovskite–silicon tandem solar cells for improved light management

Tandem configuration-containing perovskite and silicon solar cells are promising candidates for realizing a high power conversion efficiency of 30% at reasonable costs. Silicon solar cells with planar front surfaces used in tandem devices cause high optical losses, which significantly affects their efficiency. Moreover, some studies have explored the fabrication of perovskites on textured silicon cells. However, due to improper texturing, light trapping is not ideal in these devices, which reduces the efficiency. In this work, we optimized the pyramid height of textured silicon cells and efficiently characterized them to achieve enhanced light trapping. Two different kinds of perovskites, namely, Cs_0.17FA_0.6Pb(Br_0.17I_0.7)₃ and Cs_0.25FA_0.6Pb(Br_0.20I_0.7)₃ with wide bandgaps were conformally deposited on textured silicon cells, and the performance of these flat and fully textured tandem devices was numerically analyzed. The thickness of each layer in the tandem cell was optimized in a way to ensure a perfect current match between the top perovskite and bottom silicon subcells. The results indicated that the textured tandem configuration enhances light absorption over a broad spectral range due to the optimized pyramid height compared to flat surfaces. Eventually, the photovoltaic parameters of the proposed tandem cell were compared with the already existing structures, and our design supports large values of open circuit voltage (V_oc) = 1.78 V, short circuit current density (J_sc) = 20.09 mA cm⁻², fill factor (FF) = 79.01%, and efficiency (η) = 28.20% compared to other kinds of tandem solar cells.

Tandem configuration-containing perovskite and silicon solar cells are promising candidates for realizing a high power conversion efficiency of 30% at reasonable costs.     

穿支皮瓣修复口腔颌面-头颈部缺损专家共识

穿支皮瓣由皮肤穿支血管供血,是常用的组织缺损修复形式,但头颈部解剖复杂、缺损形式多样以及穿支血管解剖变异等,阻碍了穿支皮瓣在口腔颌面-头颈部缺损修复中的进一步应用。迄今为止,国内外对于穿支皮瓣修复口腔颌面-头颈部缺损临床应用缺少相关治疗指南,穿支血管的术前评价缺乏统一标准,穿支皮瓣的应用设计缺乏科学的规范,穿支皮瓣修复术后缺少客观的监测和评价体系。为进一步统一和规范穿支皮瓣在口腔颌面-头颈部缺损修复中的应用,提高重建效果,本共识总结全国多家著名医学院校及附属医院口腔颌面外科专家团队的实践经验,供临床医师参考。     

Platelets inhibit the induction of nitric oxide synthesis by interleukin-1 beta in vascular smooth muscle cells

We have investigated the role of platelets in regulating the hemostatic and vasomotor properties of vascular smooth muscle. Experiments were performed to examine the effect of the releasate from activated platelets on the production of nitric oxide from interleukin-1 beta (IL- 1 beta)-treated cultured rat aortic smooth muscle cells. Treatment of vascular smooth muscle cells with IL-1 beta resulted in significant accumulation of nitrite in the culture media and in marked elevation of intracellular cyclic guanosine monophosphate (GMP) levels. The releasate from collagen-aggregated platelets blocked the IL-1 beta- mediated production of nitrite and the accumulation of cyclic GMP in smooth muscle cells in a platelet number-dependent manner. In functional assays, the perfusates from columns containing IL-1 beta- treated smooth muscle cells relaxed detector blood vessels without endothelium and the addition of IL-1 beta-treated smooth muscle cells to suspensions of platelets inhibited their thrombin-induced aggregation. The simultaneous treatment of smooth muscle cells with IL- 1 beta and the platelet releasate abolished both the vasorelaxing activities of the perfusates and the inhibition of platelet aggregation. Platelet releasates treated with a neutralizing antibody to platelet-derived growth factor (PDGF) failed to block IL-1 beta- induced nitric oxide production by the smooth muscle cells, as measured by both biochemical and functional assays. The platelet releasate from a patient with gray platelet syndrome likewise failed to block IL-1 beta-induced nitrite release by smooth muscle cells. These results demonstrate that platelets downregulate the production of nitric oxide by IL-1 beta-treated vascular smooth muscle cells through the release of PDGF. This effect may represent a novel mechanism by which platelets regulate vasomotor tone and thrombus formation at sites of vascular injury.     

肝豆汤对tx小鼠肝脏微量元素含量及ATP7B蛋白表达的影响

目的探讨中药肝豆汤对肝豆状核变性(WD)动物模型tx小鼠肝脏微量元素铜、锌、铁代谢及ATP7B蛋白表达水平的影响。方法选择60只tx小鼠随机分为肝豆汤治疗组(n=25)和模型组(n=35),24只正常野生型DL小鼠为对照组。治疗组给予肝豆汤灌胃,模型组给予生理盐水灌胃,对照组仅常规饲养。检测各组小鼠不同月龄肝脏铜、锌、铁微量元素含量及肝组织ATP7B蛋白表达水平。微量元素检测采用原子吸收分光光度法;ATP7B蛋白表达水平分别采用免疫组化、Western blot法。结果模型组和治疗组较同月龄对照组肝脏铜含量明显升高(P均<0.01),但治疗组铜含量显著低于同月龄模型组(P均<0.01),模型组和治疗组在5月龄内均表现出随月龄增加铜含量增加(P均﹤0.01)。模型组锌含量较同月龄对照组升高,但与治疗组差异无统计学意义,同时治疗组较模型组锌含量升高与铜含量降低表现出方向一致性,但并不呈现线性相关。模型组铁含量较对照组偏高,治疗组较同月龄模型组铁含量下降(P<0.01,P<0.05)。ATP7B蛋白主要表达在细胞质。模型组ATP7B蛋白表达水平随月龄增加而上调,治疗组较同月龄模型组表达上调(P均<0.05)。结论肝豆汤可以降低tx小鼠肝脏细胞内铜含量,同时升高锌含量,降低铁含量;肝豆汤可上调ATP7B蛋白的表达,从而促进过量铜离子从胆汁中排出,减少铜的蓄积。     

便携式血糖仪系统准确性评价及血细胞比容对其检测结果的影响

目的评价便携式血糖仪系统准确性及血细胞比容对其检测结果准确性的影响。方法参照GB/T19634-2005的要求选择50例临床标本,选择当前应用广泛的5种型号血糖仪各2台,分别进行双份测定,与己糖激酶法结果比较,评价血糖仪的系统准确性。制备高、中、低血糖浓度各5个血细胞比容水平的标本,分别用5款血糖仪测定血糖浓度,与己糖激酶法结果比较,评价不同血糖浓度水平下血细胞比容对血糖仪检测结果准确性的影响。结果按照ISO 15197:2003的准确性判断标准,StatStrip Xpress、Accu-Check、Optium Xceed、Contour TS、Rightest GM300在准确限内的结果分别为100%、99%、97%、100%、75%;按照新版ISO 15197:2013的标准,StatStrip Xpress、Accu-Check、Optium Xceed、Contour TS、Rightest GM300在准确限内的结果分别为100%、99%、92%、98%、72%。在高、中、低3种血糖浓度、5个血细胞比容水平下,StatStrip Xpress的结果符合ISO15197:2003和ISO15197:2013的准确性要求;Accu-Check的结果满足ISO 15197:2003的准确性要求;Optium Xceed、Contour TS、Rightest GM300的检测结果超出了ISO15197:2003的最低允许限或无检测结果。结论血糖仪检测体系之间的准确性差异较大,部分血糖仪符合新版ISO15197:2013标准,大部分符合ISO15197:2003的要求,个别血糖仪达不到ISO15197:2003的准确性最低标准。在使用前需要对其进行评价或验证,同一医院不同血糖仪之间需要进行比对以确保血糖结果的准确可比。