雷公藤对荷肝癌(H22)小鼠的抑瘤作用的实验研究

目的:探讨中药雷公藤治疗实验性肝癌的疗效.方法:建立荷实体型肝癌(H22)小鼠模型,观察经雷公藤治疗对其肿瘤生长的影响.结果:雷公藤能显著抑制肿瘤的生长,其抑瘤率达35.46%.结论:雷公藤有明显的抗肿瘤作用.     

乳腺癌干细胞相关亚群细胞周期分析

目的：流式细胞仪分选乳腺癌细胞系MCF-7的肿瘤干细胞相关SP亚群（side population，SP），并检测SP和非SP细胞周期。方法：MCF-7细胞悬液经Hoeehst33342染色，流式细胞仪分选SP和非SP后，乙醇固定，PI染色，流式细胞仪检测细胞周期。结果：SP细胞在MCF-7细胞中占4％，Vempamil阻断后比例减为0．5％。SP细胞中S／G2／M期细胞最低，仅占7．9％，而非SP细胞增殖期比例相对高，S／G2／M期细胞约占34．2％。未分选细胞中S／G2／M期细胞比例居中，为22．9％。结论：人乳腺癌细胞系MCF-7含SP亚群，比例约为4％，且SP细胞多处于静止期，具有一般干细胞的特性。     

重组人白介素-2吸入给药对小鼠克雷伯肺炎感染的影响

目的研究重组人白介素-2吸入给药对小鼠克雷伯肺炎感染的保护作用。方法小鼠以滴鼻感染法进行感染。感染过程中,以鼻腔插管注入法和皮下注射给予小鼠重组人白介素-2。同时另设正常组、阴性对照组、模型组和阳性对照组(庆大霉素组)。观察各组动物肺病理变化,比较平均死亡时间和一周内死亡率,测定支气管肺泡洗涤液中总蛋白、白蛋白含量,碱性磷酸酶、乳酸脱氢酶活力。结果重组人白介素-2给药组肺病理变化与模型组和阴性对照组相比显著减轻,支气管肺泡洗涤液中总蛋白、白蛋白含量和碱性磷酸酶活力降低。结论吸入重组人白介素-2缓解感染后肺部病理变化, 为研发重组人白介素-2吸入剂提供了依据。     

The floating knee in the pediatric patient. Nonoperative versus operative stabilization

The results of nonoperative and operative or rigid stabilization of ipsilateral femur and tibia fractures in children and adolescents were evaluated. Twenty-nine consecutive patients with open physes (30 affected extremities) were reviewed. Their mean followup was 8.6 years (range, 1.1-18.6 years). The nonoperative group consisted of 16 patients and 16 extremities treated by skeletal traction of the femoral fracture, closed reduction and splinting or casting of the tibia fractures, and eventual immobilization in a hip spica cast. The operative group, was comprised of 13 patients and 14 extremities in which one or both fractures were treated by open reduction and internal fixation, intramedullary fixation, or external fixation. Despite higher modified injury severity scores and skeletal injury scores, the patients who were treated operatively had a significantly reduced hospital stay, 20.1 days versus 34.9 days, respectively; decreased time to unsupported weightbearing, 16.8 weeks compared with 22.3 weeks, respectively; and fewer complications. Operative stabilization of the femur had a significant effect on decreasing the length of hospital stay and the time to unassisted weightbearing. The patients also were analyzed according to their age at the time of injury: 9 years of age or younger and 10 years of age and older. The younger children who were treated nonoperatively had an increased rate of lower extremity length discrepancy, angular malunion, and need for a secondary surgical procedure as compared with younger children who were treated operatively with rigid fixation. Based on the results of the current study, operative stabilization of at least the femur fracture and, preferably, both fractures in the treatment of a child with a floating knee is recommended, even for younger children.     

Calpastatin participates in the regulation of cell migration in BAP1-deficient uveal melanoma cells

AIM: To detect how BRCA-associated protein 1 (BAP1) regulates cell migration in uveal melanoma (UM) cells. METHODS: Wound healing and transwell assays were performed to detect UM cell migration abilities. Protein chip, immunoprecipitations and surface plasmon resonance analyses were applied to identify BAP1 protein partners. Western blot and calpain activity assays were used to test the expression and function of calpastatin (CAST). RESULTS: CAST protein was confirmed as a new BAP1 protein partner, and loss of BAP1 reduced the expression and function of CAST in UM cells. The overexpression of CAST rescued the cell migration phenotype caused by BAP1 loss. CONCLUSION: BAP1 interacts with CAST in UM cells, and CAST and its subsequent calpain pathway may mediate BAP1-related cell migration regulation.     

C反应蛋白与白蛋白比值对川崎病早期丙种球蛋白抵抗的预测价值

目的 探讨C反应蛋白与白蛋白比值(CRP/ALB)对川崎病(KD)早期丙种球蛋白(IVIG)抵抗的预测价值。方法 将2020年1月至2023年6月成都医学院第一附属医院住院的118例病程≤5 d的KD患儿分为IVIG抵抗组和IVIG敏感组,分析患儿临床资料,采用多因素Logistic回归分析探究独立危险因素,ROC曲线探究CRP/ALB对KD患儿早期IVIG抵抗的预测价值。结果 IVIG抵抗组比IVIG敏感组有更高水平的白细胞计数(WBC)、CRP、CRP/ALB和更低水平的血红蛋白(HGB)。CRP/ALB升高和HGB降低是KD患儿早期IVIG抵抗的独立危险因素。CRP/ALB可预测KD患儿早期IVIG抵抗(AUC=0.664)。结论 CRP/ALB升高和HGB降低是KD患儿早期IVIG抵抗的独立危险因素,CRP/ALB可有效预测KD患儿早期IVIG抵抗。     

颞下颌关节软骨下骨改建

颞下颌关节改建机制是正畸功能矫形和颞下颌关节紊乱病研究的主要内容。随着研究的深入,软骨下骨作为一个生物力学和生理学特性均有别于关节软骨和骨松质的基本功能单位,其在压力传递和关节改建中的重要性逐步凸现出来。本文就软骨下骨的解剖、功能、特性、病变类型以及与颞下颌关节改建的关系作一综述。     

Modification of C.I. Pigment Red 146 with surfactants and graphene oxide

Organic pigments are important in a range of fields, from printing ink to industrial coatings. Azo pigments are some of the most common pigments in use today, but they typically have poor solvent solubility and tend to agglomerate. Consequently, the size and crystal structure of the pigment particles has a crucial effect on their optical and physical properties, such as color strength and solvent resistance, respectively. Several technologies, such as microreactors, have been developed to control pigment particle size, but an in-depth study of the effects of modification conditions on pigment properties (color, flowability, and solvent resistance) has not been reported to date. Therefore, in this paper, we report the surface modification of C.I. Pigment Red 146 particles using anionic (Igepon T) and non-ionic surfactants (Peregal O-25) and additives (DB-60 as the second diazo component and graphene oxide) on the pigment properties. In addition, we examined the effect of hydrothermal treatment at different temperatures on the same properties. The various modifications resulted in an increase in the solvent resistance, a reduction in the particle size (from 30.581 to 12.252 μm), a narrowing of the particle size distribution, and an increase in hydrophilicity. In addition, the color brightness and brilliance were significantly improved, and the maximum color strength reached 112.6%. These findings have applications for the development of pigments having enhanced color properties, solvent resistance, and processability.

The color properties and solvent resistance of modified Pigment Red 146 were obviously improved by adding surfactants and graphene oxide.     

Altereporenes A–E,five epoxy octa-hydronaphthalene polyketides produced by an endophytic fungus Alternaria sp. YUD20002

Five previously undescribed epoxy octa-hydronaphthalene polyketides, altereporenes A–E (1–5) were isolated from rice culture of the endophytic fungus Alternaria sp. YUD20002 derived from the tubers of Solanum tuberosum. Their structures were determined on the basis of comprehensive spectroscopic analyses, while the absolute configurations were elucidated by the comparison of experimental and calculated specific rotations. Meanwhile, the antimicrobial, cytotoxic, anti-inflammatory and acetylcholinesterase inhibitory activities of compounds 1–5 were also investigated.

Five previously undescribed epoxy octa-hydronaphthalene polyketides, altereporenes A–E (1–5) were isolated from rice culture of the endophytic fungus Alternaria sp. YUD20002 derived from the tubers of Solanum tuberosum.     

Contribution Ratio Assessment of Process Parameters on Robotic Milling Performance

Robotic milling has broad application prospects in many processing fields. However, the milling performance of a robot in a certain posture, such as in face milling or grooving tasks, is extremely sensitive to process parameters due to the influence of the serial structure of the robot system. Improper process parameters are prone to produce machining defects such as low surface quality. These deficiencies substantially decrease the further application development of robotic milling. Therefore, this paper selected a certain posture and carried out the robotic flat-end milling experiments on a 7075-T651 high-strength aeronautical aluminum alloy under dry conditions. Milling load, surface quality and vibration were selected to assess the influence of process parameters like milling depth, spindle speed and feed rate on the milling performance. Most notably, the contribution ratio based on the analysis of variance (ANOVA) was introduced to statistically investigate the relation between parameters and milling performance. The obtained results show that milling depth is highly significant in milling load, which had a contribution ratio of 69.25%. Milling depth is also highly significant in vibration, which had a contribution ratio of 51.41% in the X direction, 41.42% in the Y direction and 75.97% in the Z direction. Moreover, the spindle speed is highly significant in surface roughness, which had a contribution ratio of 48.02%. This present study aims to quantitatively evaluate the influence of key process parameters on robotic milling performance, which helps to select reasonable milling parameters and improve the milling performance of the robot system. It is beneficial to give full play to the advantages of robots and present more possibilities of robot applications in machining and manufacturing.