抑制PI3K通路增强CAHB对Jurkat细胞的凋亡作用

目的 探讨CAHB单独使用及与LY294002联合应用对Jurkat细胞体外作用的影响.方法 分别用不同剂量的CAHB(0、5、10、20、40mmol/L)诱导Jurkat细胞,用MTS法检测Jurkat细胞的增殖抑制效应,流式细胞术分析Jurkat细胞凋亡情况;取40mmol/L浓度的CAHB加入PI₃K抑制剂LY294002,流式细胞术分析Jurkat细胞凋亡情况.结果 CAHB对Jurkat细胞生长有显著的抑制作用,并能显著诱导Jurkat细胞发生凋亡,其作用呈明显剂量、时间依赖性.PI₃K抑制剂LY294002能显著增强CAHB对Jurkat细胞的凋亡作用.结论 CAHB能抑制Jurkat细胞增殖,并诱导其凋亡.抑制PI₃K通路能增强CAHB对Jurkat细胞的凋亡作用.     

基于实际培训需求构建中专学历护士岗上培训体系的研究

目的 基于培训需求的充分调研建构低年资中专学历护士中专学历系统型岗上培训体系,为提高低年资中专学历护士岗上培训质量提供新的路径参考.方法 采用便利法、分层法、随机数字法抽取四川省南充、自贡、遂宁、广安四个地级市104家2008名低年资中专学历护士以及172名护理/人力资源管理人员,采用问卷调研法/访谈法调对低年资护士岗上培训需求进行调研和分析,并据此建构低年资中专学历护士系统型岗上培训体系.结果 经数据分析和资料分析,确定低年资中专学历护士对培训内容、方法、师资、时间以及管理五个维度的21项具有需求,医院方具有理念性、目标性、了解性、组织性、能力性、机制性6项需求.由此建构出包含战略、支持、实施三大系统以及细分的9个子系统组成的低年资护士系统型岗上培训体系.结论 系统型培训是极有成效的岗上培训模式,基于医疗机构整体发展与护士岗上培训一体化理念建构系统型培训体系是当前系统型培训模式的发展趋势,更是这一培训模式真正发挥作用的重要保证.     

大鼠严重创伤后早期下丘脑c-fos和CRH mRNA的表达

目的 探讨严重创伤后下丘脑c-fos蛋白和CRH mRNA表达变化的关系。方法 以大鼠右肺中部重度撞击伤加右股骨中段骨折为模型，采用Western印迹和RT-PCR方法观察大鼠下丘脑组织内c-fos蛋白和CRH mRNA表达变化。结果 伤后下丘脑c-fos含量30min达高峰，以后迅速下降；CRH mRNA表达的变化明显迟于c-fos的变化，创伤后下丘脑CRH mRNA含量于2h增加最为明显，然后持续增加，12h达最高。结论 严重创伤后早期下丘脑迅速增加的c-fos对CRH mRNA的上调可能起关键的作用。     

Chiari I畸形幕上下面积MRI测量

目的运用MRI对ChiariI畸形患者的幕上下结构进行测量,探讨ChiariI畸形的发病机制。方法选择小脑扁桃体下疝者114例,不伴中枢神经系统疾患者100例作为对照组。在颅脑正中矢状面T1WI上对幕上下结构进行测量。结果[(后脑宽×后脑长)/(后颅宽×后颅深)]值和(后颅宽×后颅深)值在两组间存在显著差异,其中前者比值在畸形组和对照组分别为1.42±0.60和0.95±0.20,畸形组比值明显高于对照组(P<0.01);后者在畸形组和对照组分别为2027.96±584.84mm2和2740.00±565.54mm2,畸形组明显小于对照组(P<0.01)。结论ChiariI畸形患者存在枕骨发育不良,即胚胎中胚层枕骨部体节发育不良导致枕骨发育滞后,而小脑脑干发育正常,出现了后颅窝过度拥挤现象,因此ChiariI畸形的病变是在后颅的骨性结构,而非神经结构。     

Impact of Precursor Concentration on Perovskite Crystallization for Efficient Wide-Bandgap Solar Cells

High-crystalline-quality wide-bandgap metal halide perovskite materials that achieve superior performance in perovskite solar cells (PSCs) have been widely explored. Precursor concentration plays a crucial role in the wide-bandgap perovskite crystallization process. Herein, we investigated the influence of precursor concentration on the morphology, crystallinity, optical property, and defect density of perovskite materials and the photoelectric performance of solar cells. We found that the precursor concentration was the key factor for accurately controlling the nucleation and crystal growth process, which determines the crystallization of perovskite materials. The precursor concentration based on Cs_0.05FA_0.8MA_0.15Pb(I_0.84Br_0.16)₃ perovskite was controlled from 0.8 M to 2.3 M. The perovskite grains grow larger with the increase in concentration, while the grain boundary and bulk defect decrease. After regulation and optimization, the champion PSC with the 2.0 M precursor concentration exhibits a power conversion efficiency (PCE) of 21.13%. The management of precursor concentration provides an effective way for obtaining high-crystalline-quality wide-bandgap perovskite materials and high-performance PSCs.     

Giant cervical goiter in Hashimoto’s thyroiditis: A case report

A giant cervical goiter, defined as a thyroid mass larger than 8 cm in diameter, is usually a nodular or adenomatous goiter. A giant cervical goiter can also be caused by hyperthyroidism (i.e., Hashimoto’s thyroiditis). The surgical indications for patients with Hashimoto’s disease include suspected malignant tumors, persistent symptoms related to the disease, or persistent enlargement of the goiter. We herein describe a woman who developed symptoms of compression from a thyroid tumor, the volume of which was almost the largest reported in the relevant literature to date. The bilateral lobes of the giant thyroid tumor were removed by total en bloc excision. We protected the bilateral recurrent laryngeal nerve and preserved the bilateral upper and lower parathyroid glands in situ. The excised left lobe tumor was 16 × 9 × 5.5 cm, whereas the right lobe tumor was 12 × 8 × 4 cm. The pathological diagnosis was Hashimoto’s thyroiditis. Although surgical excision is difficult, it is still the main treatment modality for giant goiters in patients with Hashimoto’s thyroiditis and can help to reduce the occurrence of complications.     

医共体模式下基层医院护士开展“互联网+护理服务”的体验

目的 了解医共体模式下基层护士开展“互联网+护理服务”的体验与期望,为针对性干预提供参考。方法 采用目的抽样法选取医共体分院的12名具有“互联网+护理服务”资质的基层护士进行半结构式访谈,采用Colaizzi七步分析法分析资料,提炼主题。结果 提炼出职业价值感提升、医共体模式下管理同质化、加强“互联网+护理服务”的宣传、加强专科操作技能培训、实现团队协作个性化服务5个主题。 结论 提炼的主题反映了医共体模式下基层护士开展“互联网+护理服务”的收获与期望,可作为进一步完善“互联网+护理服务”项目机制的参考。     

Evidence-Based Nutrition Interventions Improved Adolescents’ Knowledge and Behaviors in Indonesia

Adolescence is a nutritionally vulnerable and critical life stage. However, few programs and policies focus on improving adolescent nutrition in Indonesia. To address this gap, we implemented a gender-responsive package of interventions: (1) breakfast and weekly iron-folic acid supplementation (WIFS), (2) a school-based nutrition education program, and (3) a social behavior change communication strategy. We surveyed 514 adolescents at baseline (2019) and endline (2020) in Klaten and Lombok Barat districts in Indonesia. The survey included a knowledge assessment on nutrition, as well as indicators of attitudes and behaviors on diet, physical activity, and WIFS. We employed multivariable linear and logistic regression to test for pre–post intervention differences. Overall knowledge was significantly higher post-intervention (β: 3.3; 95% confidence interval [CI]: 2.6, 3.9). Diet diversity was high at both timepoints, however, at post-intervention there was significantly higher odds of consuming vitamin A-rich fruits and vegetables (Odds Ratio [OR]: 1.5; 95% CI: 1.1, 2.0) and lower odds of consuming sugar-sweetened beverages (OR: 0.4; 95% CI: 0.3, 0.5). Post-intervention, there was higher odds of reporting 60 min of daily physical activity (OR: 2.3; 95% CI: 1.7, 3.2) and WIFS among girls (OR: 6.7; 95% CI: 1.5, 30.9). The package of interventions may be a promising first step to improving adolescent nutrition in Indonesia.     

Sulfate Freeze–Thaw Resistance of Magnesium Potassium Phosphate Cement Mortar

Concrete facilities in the severe-cold areas of western China (salt lake environments and heavy saline soils) are seriously damaged by the multiple corrosion effects of freeze–thaw cycles and sulfate corrosion. Magnesium phosphate cement (MPC) cement-based material has become an ideal concrete structural component because of its superior performance. Because concrete structural repair materials are used in heavy-corrosion environments, their durability in those environments should also be considered. Regarding the salt-freezing resistance of MPC, the existing studies have all used a NaCl solution as the heat transfer medium. In addition to chlorine salt, sulfate, especially Na₂SO₄, is also common in typical use environments such as oceans, salt lakes, and groundwater. To evaluate the sulfate freeze–thaw resistance of potassium magnesium phosphate cement (MKPC) mortar, in this study the strength development, weight loss, and water absorption of MKPC mortar specimens subjected to different freeze–thaw cycles were tested and compared with those for Portland cement (P.O) mortar specimens of the same strength grade. The results showed that the P.O mortar specimen completely lost its strength after 75 cycles of rapid water freezing and thawing and 50 cycles of sodium sulfate solution (5%) freezing and thawing. However, the residual strength rating of the MKPC mortar specimen after 75 cycles of water freezing and thawing and 100 cycles of sodium sulfate solution freezing and thawing was higher than 75%. After 50 rapid freeze–thaw cycles in water and a 5% Na₂SO₄ solution, the P.O mortar specimen’s mass loss exceeded the 5% failure standard, whereas the mass loss of the MKPC mortar specimens was much less than 5%. Before the freeze–thaw cycles, the water absorption of the P.O mortar specimen was close to 8 times that of the MKPC mortar specimen, and after 50 water freeze–thaw cycles and 25 sulfate solution freeze–thaw cycles, the water absorption reached 4.88% and 5.68%, respectively. However, after 225 freeze–thaw cycles in water and the sulfate solution, the water absorption rates of MKPC mortar specimens were 2.91% and 2.51% respectively. The test and analysis results show that the freeze–thaw resistance of MKPC mortar was much higher than that of Portland cement mortar specimens. Those results provide a prerequisite for applying and expanding the use of MKPC-based materials in severe-cold areas of western China (salt lake and heavily saline soil environments).