A Study of Crystalline Mechanism of Penetration Sealer Materials

It is quite common to dispense a topping material like crystalline penetration sealer materials (CPSM) onto the surface of a plastic substance such as concrete to extend its service life span by surface protections from outside breakthrough. The CPSM can penetrate into the existing pores or possible cracks in such a way that it may form crystals to block the potential paths which provide breakthrough for any unknown materials. This study investigated the crystalline mechanism formed in the part of concrete penetrated by the CPSM. We analyzed the chemical composites, in order to identify the mechanism of CPSM and to evaluate the penetrated depth. As shown in the results, SEM observes the acicular-structured crystals filling capillary pores for mortar substrate of the internal microstructure beneath the concrete surface; meanwhile, XRD and FT-IR showed the main hydration products of CPSM to be C-S-H gel and CaCO₃. Besides, MIP also shows CPSM with the ability to clog capillary pores of mortar substrate; thus, it reduces porosity, and appears to benefit in sealing pores or cracks. The depth of CPSM penetration capability indicated by TGA shows 0–10 mm of sealer layer beneath the concrete surface.     

TBA-120FR型全自动生化分析仪常见故障维修分析4例

全自动生化分析仪能够对血液、尿液中的特定物质进行定量分析检测,但由于使用频繁导致故障多发。本文对东芝TBA-120FR分析仪四例故障的发生原因、排查经过和检修结果进行了总结。深入学习分析仪的工作原理,解决了仪器参比液无法正常吸取、患者样本检测结果总体偏低、标本结果交叉污染以及结果重复性差等问题,在排除故障后保证设备能正常使用。另外,希望我们提到的维修案例能为行业工作者对同类设备的故障维修提供参考。     

Pentacam眼前节分析仪检查参数对早期圆锥角膜的诊断价值

目的：分析Pentacam眼前节分析仪检查参数对早期圆锥角膜的诊断价值。

方法：回顾性对照研究,选取2019-01/2020-01于我院就诊的圆锥角膜患者100例124眼作为研究组,根据Amsler-Krumeich分级法将圆锥角膜患者按照严重程度分为轻度组(51眼)、中度组(43眼)和重度组(30眼),另外选取30名屈光度<-3.00D且无散光体检正常者右眼作为对照组,比较各组Pentacam眼前节分析仪参数\〖3mm直径范围水平中央曲率(K1)、3mm直径范围垂直中央曲率(K2)、角膜前表面最大屈光力(Kmax)、角膜散光(Cyl)、角膜最薄处的厚度(thinnest local)、角膜表面变异指数(ISV)、垂直不对称指数(IVA)、圆锥角膜指数(KI)、前房容积(ACV)以及前房深度(ACD)\〗情况,通过ROC曲线分析诊断早期圆锥角膜的敏感指标。

结果：研究组患者K1、K2、Kmax、Cyl、ISV、IVA、KI、ACD均明显高于对照组(P<0.05),thinnest local、ACV均明显低于对照组(P<0.05); 不同严重程度圆锥角膜患者的K1、K2、Kmax、Cyl、thinnest local、ISV、IVA、KI、ACV、ACD差异均有统计学意义(P<0.05),中度组和重度组K1、K2、Kmax、Cyl、ISV、IVA、KI、ACD均明显高于轻度组(P<0.05),thinnest local、ACV均明显低于轻度组(P<0.05),中度组和重度组K1、K2、Kmax、Cyl、thinnest local、ISV、IVA、KI、ACV、ACD比较有差异P<0.05); ROC诊断曲线结果显示,Kmax、thinnest local、ISV、IVA、KI是诊断圆锥角膜的敏感指标(AUC>0.85),其中ISV的诊断价值最高。

结论：Pentacam眼前节分析仪可有效测量圆锥角膜参数,不同严重程度圆锥角膜患者参数存在差异,其中Kmax、thinnest local、ISV、IVA、KI是诊断早期圆锥角膜的敏感指标,Pentacam眼前节分析仪检查参数对早期圆锥角膜具有较高的诊断价值。     

SYSMEX XN-1000血球仪在脑脊液和胸腹水白细胞计数中的可行性探讨

目的：探讨SYSMEX XN-1000血液分析仪(简称SYSMEX XN-1000)的体液模式在脑脊液和胸腹水白细胞计数中应用的可行性。方法分别采用手工显微镜镜检法和SYSMEX XN-1000对183例脑脊液和胸腹水标本进行白细胞计数,将所测结果按A：(0~1000)×106/L,B：(1001~5000)×106/L,C：>5000×106/L分为三组,分别进行统计学分析。结果与手工显微镜镜检法相比,SYSMEX XN-1000所测结果差异无统计学意义(P>0.05)。A、B、C三组的相关系数分别为0.993、0.984、0.996,A组回归方程为y=1.007x-1.072,B组回归方程为y=1.003x+19.776,C组回归方程为y=1.241x-1419.365。结论 SYSMEX XN-1000血液分析仪可用于临床脑脊液和胸腹水中白细胞计数,其操作简单易行,结果稳定可靠,但如果仪器进行样品检测时报警,应当手工镜检复核,以提高结果的准确性和可靠性。     

单笼与群居饲养对雌性食蟹猴生理指标的影响

目的 了解单笼与群居饲养雌性食蟹猴生理指标的差异.方法 选取9只4～6岁雌性食蟹猴作为实验对象,前5个月单笼饲养,后5个月群居饲养.对体质量、体温、血常规、血生化、尿常规等生理指标进行测定.采用重复测量方差分析比较两阶段指标是否存在差异.结果 食蟹猴单笼阶段的体质量显著低于群居阶段(P＜0.05).血常规中,单笼阶段的白细胞计数(WBC)、嗜中性粒细胞计数(NEUT)、嗜中性粒细胞百分比(NEUT％)极显著高于群居阶段(P＜0.01);单笼阶段的单核细胞计数(MONO)、单核细胞百分比(MONO％)极显著低于群居阶段(P＜0.01);单笼阶段的淋巴细胞百分比(LYMPH％)显著低于群居阶段(P＜0.05).血液生化中,单笼阶段的总胆红素(TBIL)极显著低于群居阶段(P＜0.01);单笼阶段的天门冬氨酸氨基转移酶(AST)、甘油三酯(TG)显著高于群居阶段(P＜0.05).单笼阶段的尿常规中的蛋白质阳性率高于群居阶段,组间相比差异显著(P＜0.05).其余指标组间相比无统计学差异.结论 食蟹猴更适合群居饲养,如果长期单笼饲养,可能对其体质量及血液学和尿常规中某些指标产生较大影响.     

实时细胞分析法建立小肠上皮细胞生长实验模型

目的利用实时细胞分析仪,并以表皮生长因子(EGF)为促进细胞生长的工具药,观察EGF在不同培养条件下对细胞生长的影响,为建立IEC-6细胞生长(增殖)药理实验模型提供参考。方法以1×10~4/孔的密度将细胞接种于E-Plate 16板,并以含10%血清DMEM培养24 h,换成无血清DMEM培养(即血清饥饿)20 h后,观察不同培养条件对细胞生长的影响及EGF的药效。结果 (1)10%血清时,EGF组(1、10、100μg·L^-1)给药24、48、72 h后,细胞生长指数与空白组比较均P>0.05,提示含10%血清培养不能反映EGF的药效;(2)0%血清时,EGF(1、10μg·L^-1)对无血清培养所致的细胞生长抑制有改善作用,但不能使其恢复正常水平(给药24、48、72 h后,EGF组与5%血清空白组比较均P<0.01),提示无血清培养不能反映EGF的药效;(3)0%、0.5%、1%血清可对细胞生长产生不同影响,其中0.5%血清既不会对细胞生长产生明显抑制,也不会由于促进细胞生长时间较长而不利于反映EGF药效;(4)0.5%血清时,EGF各剂量组给药24、48、72 h后,均能促进细胞生长(细胞指数与空白组比较均P<0.01),提示0.5%血清培养条件下可较好反映EGF药效;(5)重复验证了0.5%血清时EGF(10μg·L^-1)促进细胞生长的药效。结论在实时细胞分析仪建立IEC-6细胞生长(增殖)药理实验模型的参考方案:细胞以含10%血清DMEM培养24 h,再以无血清DMEM培养(即血清饥饿)20 h,然后加受试药,并以含0.5%血清培养48~72 h,可观察其对细胞生长(增殖)影响的药效。     

Evaluation of HbA1c on the Roche COBAS Integra 800 closed tube system

OBJECTIVES: Evaluate a new whole blood (WB) HbA1c immunoassay and system with closed tube sampling (CTS) capability. DESIGN AND METHODS: Compare the Tina-quant Haemoglobin A1c Gen.2 (A1C-2) application on the COBAS INTEGRA 800 (I800) and new I800 dedicated system with CTS capability to current Integra applications and a HbA1c method accurate with common haemoglobin (Hb) variants. RESULTS: CVs were < or =1.7%. Mean bias against National Glycohaemoglobin Standardization Program (NGSP) samples was 0.3 HbA1c %. Compared to the Hitachi Tina-quant(R) [a] HbA1c II (HbA1c II) assay (accurate with common Hb variants), mean bias was 0.04% and 0.21% HbA1c at 6% and 9%, respectively, with Hb AS variants; and -0.01% and 0.26% HbA1c at 6% and 9%, respectively, with Hb AC variants. CONCLUSIONS: The Integra A1C-2 application is precise, accurate against NGSP-assigned samples and the Hb variants tested; and, the I800 dedicated system with CTS capability offers increased throughput and reduced sample handling.     

Mitochondria as a Platform for Dictating the Cell Fate of Cultured Human Corneal Endothelial Cells

PurposeAiming to clarify the role of mitochondria in cell fate decision of cultured human corneal endothelial cell (cHCEC) subpopulations.MethodsThe mitochondrial respiratory ability were examined with Mito stress and Mito fuel flex test assays using an extracellular flux analyzer (XFe24; Agilent Technologies; Santa Clara, CA) for human corneal endothelium tissues, mature cHCECs and a variety of cell state transitioned cHCECs. Tricarboxylic acid cycle and acetyl-coenzyme A–related enzymes was analyzed by proteomics for cell lysates using liquid chromatography–tandem mass spectrometry for cHCEC subpopulations.ResultsThe maximum oxygen consumption rate was found to become stable depending on the maturation of cHCECs. In the Mito stress tests, culture supplements, epidermal growth factor, SB203580, and SB431543 significantly repressed oxygen consumption rate, whereas a Rho-associated protein kinase inhibitor Y-27632 increased. Tricarboxylic acid cycle and mitochondria acetyl-coenzyme A–related enzymes were selectively upregulated in mature cHCECs, but not in cell state transitioned cHCECs. The maximum oxygen consumption rate was found to be higher in healthy human corneal endothelium tissues than those with deeply reduced cell density. An upregulated tricarboxylic acid cycle was linked with metabolic rewiring converting cHCECs to acquire the mitochondria-dependent oxidative phenotype.ConclusionsMitochondrial metabolic intermediates and energy metabolism are tightly linked to the endothelial cell fate and function. These findings will help us to standardize a protocol for endothelial cell injection.     

Sysmex XN-9000血液分析仪前体白细胞通道（WPC）原始/异常淋巴细胞报警可靠性的评价

目的评价Sysmex XN-9000血液分析仪(简称"XN-9000")前体白细胞通道(WPC)检测外周血触发WBC报警的可靠性。方法采用与手工血涂片白细胞形态镜检结果比对的方法,复核520例分别经Sysmex XE-2100血液分析仪(简称"XE-2100")和XN-9000检测触发WBC报警的标本,按报警种类统计判读结果。结果 XN-9000 WPC通道的Blast(原始细胞)报警比XE-2100特异性高(χ~2=6.98,P0.05),XN9000将假阳性率从XN2100的64%降低至36%(χ~2=6.18,P0.05)。XN-9000 WPC的Blast/Abn Lympho(原始/异常淋巴细胞)综合有效率90.4%、94.4%,高于XE2100的72.2%和80.1%(χ~2分别为5.6、6.33,P均0.05)。在WPC通道自动复测模式下,在所有被检标本(体验健康者和患者,包括新生儿)中,WPC通道Blast/Abn Lympho(原始/异常淋巴)报警的特异性和总有效率高于WDF(χ~2=6.15、4.14、6.02、4.88,P0.05),降低了WDF通道误报率;XN-9000(WDF/WPC)总报警复片率低于XE-2100(χ~2=4.33,P0.05);而XN-9000(WDF/WPC)Blast/Abn Lympho(原始/异常淋巴)报警的复片率为32%(84/260),低于XE-2100的41%(107/260)(χ~2=4.38,P0.05)。结论XN-9000 WPC通道相较于XE-2100,提高了Blast/Abn Lympho(原始/异常淋巴)报警的综合有效性,降低了误报率和复片率,提高了临床实验室的工作效率。