Effects of Wollastonite Fiber and Styrene–Butadiene Latex Polymer on the Long-Term Durability of Cement-Based Repair Materials

Concrete structures are constructed in various geographical environments and climates, and frequently fail to fulfill their original functions over time due to issues such as aging and damage. Research on concrete structure repair materials is being conducted to solve these problems. This study evaluated the durability of a repair material composed of ultra-rapid hardening cement, styrene–butadiene (SB) latex polymer, and wollastonite mineral fiber. The performance targets were as follows: compressive strength of 20 MPa at 1 day of age and 45 MPa at 28 days of age, chloride ion charge passed of less than 1000 Coulombs, carbonation depth of 20 mm or less, and resistance to repeated freezing and thawing (relative dynamic modulus of elasticity) of 80% or more. The ultra-rapid hardening cement:silica sand ratio of 1:1.5 was the experimental variable, and the unit weight of each material in the mix proportion was determined to satisfy the flow requirement of 200 ± 5 mm. This flow ensured sufficient fluidity for spraying, which is the most widely used method for applying repair material. Wollastonite mineral fiber and SB latex polymer were added at 3% and 5% of the unit weight of the binder, respectively. The mechanical property of the repair material was evaluated through compressive strength, and durability was evaluated through chloride ion penetration, alkali resistance, resistance to carbonation, water absorption, and repeated freezing and thawing tests. The compressive strength satisfied both target values, regardless of the addition of SB latex polymer and wollastonite mineral fiber. The chloride ion penetration test, which was used as an indicator of durability, showed that mixtures without SB latex and wollastonite mineral fiber were not satisfied the target charge passed of 1000 Coulombs, while mixtures with latex and mineral fiber reached the target value. Notably, the co-addition of latex and wollastonite fiber showed the highest resistance to chloride ion penetration, alkali ion, carbonation, repeated freezing and thawing, and the least absorption. The results confirmed that the durability of the repair material based on ultra-rapid hardening cement was most effectively improved by the co-addition of SB latex polymer and wollastonite mineral fiber.     

天麻钩藤饮抑制铁死亡-脂质代谢保护鱼藤酮诱导的PC12细胞损伤

目的:研究天麻钩藤饮(TGY)对鱼藤酮(Rot)诱导的大鼠肾上腺嗜铬细胞瘤PC12细胞损伤的影响及可能的机制。方法:采用Rot建立和培养PC12细胞神经损伤模型并利用MTT比色法测定细胞存活率,确定Rot的最佳造模浓度以及TGY的有效干预浓度。流式细胞仪检测细胞的脂质活性氧(ROS)水平并用荧光倒置显微镜观察细胞荧光强度的变化;生化试剂盒检测超氧化物歧化酶(SOD),谷胱甘肽(GSH)的水平和活力变化以及丙二醛(MDA)含量的变化。透射电子显微镜观察细胞线粒体形态变化,蛋白免疫印迹法检测细胞内谷胱甘肽过氧化物酶4(GPX4),长链脂酰辅酶A合成酶4(ACSL4),溶血卵磷脂酰基转移酶3(LPCAT3)蛋白表达。结果:0.6μmol/L Rot处理细胞24 h后,细胞存活率接近50%(56.7%±9.9%),TGY预处理12 h后可抑制Rot的损伤程度。同时,减少乳酸脱氢酶(LDH)的漏出率,并呈现一定的量效关系。Rot处理后的细胞内脂质ROS含量升高,而给予TGY预处理后有效降低Rot损伤的细胞内脂质ROS的含量,降低Rot处理后的MDA水平,并提高SOD活力和GSH水平。通过透射电镜观察到与正常组相比,0.6μmol/L Rot处理后细胞的线粒体皱缩,TGY预保护处理后,PC12细胞的线粒体形态有一定程度的改善。Western blot的结果呈现出TGY预处理后可以在一定程度提高Rot损伤后GPX4的表达,下降ACSL4、LPCAT3的表达。结论:TGY可以上调GPX4蛋白的表达,下调ACSL4、LPCAT3蛋白的表达,抑制不饱和脂肪酸的氧化,降低脂质过氧化水平和ROS的含量,从而改善神经损伤。     

盐酸二甲双胍治疗奥氮平导致的精神分裂症患者代谢综合征的疗效及其与慢性炎症状态的关系

目的：分析二甲双胍治疗奥氮平导致的精神分裂症患者代谢综合征（MS）的疗效,并进一步分析治疗过程中C-反应蛋白（CRP）和肿瘤坏死因子-α(TNF-α)的变化。方法：按照入组病历号随机选取满足入组标准和排除标准的精神分裂症患者100例,依据随机数字表分为研究组和对照组各50例,干预治疗前和24周后分别检测患者体质量指数（BMI）、稳态胰岛素评价指数（HOMA-IR）、空腹血浆葡萄糖（FPG）、糖化血红蛋白（Hb A1c）、高密度脂蛋白胆固醇（HDL-C）、低密度脂蛋白胆固醇（LDL-C）、总胆固醇（TC）、甘油三酯（TG）、CRP和TNF-α,并进行统计分析。结果：两组患者性别、受教育程度、婚姻、家族史、病程、年龄和奥氮平治疗剂量分布差异无统计学意义（P>0.05）。盐酸二甲双胍治疗后研究组BMI、HOMA-IR、FPG、HbA1c、HDL-C、LDL-C、TC、TG、CRP、TNF-α的差值明显高于对照组（P<0.05）。研究组CPR和TNF-α与BMI和HOMA-IR呈显著正相关,ΔCPR可以分别解释ΔBMI变异的13.4%,ΔHOMA-IR变异的11.4%;ΔTNF-α...     

TM6SF2在非酒精性脂肪肝病中的研究进展

非酒精性脂肪肝病（nonalcoholic fatty liver disease,NAFLD）是一类慢性肝脏疾病,以肝脏中甘油三酯（triglycerides,TG）异常积聚为特征,其发病率逐年增加,是目前最常见的肝脏疾病。跨膜6超家族成员2(transmembrane 6 superfamily member 2,TM6SF2)属于跨膜蛋白超家族成员,大量研究证实TM6SF2在NAFLD的发生发展中起重要作用。本文就TM6SF2在NAFLD中的作用及可能机制进行综述。     

血脂异常中医证候及与代谢综合征相关性的研究

通过对600例血脂异常患者中医证侯的研究,总结了血脂异常中医证候分布的规律,确认血脂异常患者的病机是以本虚为主,脾虚和肾虚是血脂异常发病的主要病理基础,痰浊和瘀血也是影响血脂异常中医证候的重要因素,建议在治疗时应以补脾益肾为主要治疗原则。并首次在血脂异常的辨证中提出了＂无证候可辨＂的概念。通过对血脂异常中医证候与代谢综合征（MS）相关性的研究发现血脂异常中医证候的产生与MS及其组分中的超重或肥胖及高血压密切相关,提出MS及其各组分的存在是引起血脂异常中医虚证的重要因素,阐明了应用辨证论治的方法在治疗血脂异常的同时可以改善MS,还可以提高患者的生活质量,因而优于单纯的降脂治疗。     

Antiparkinson drug--Mucuna pruriens shows antioxidant and metal chelating activity

Parkinson's disease is a neurodegenerative disorder for which no neurorestorative therapeutic treatment is currently available. Oxidative stress plays an important role in the pathophysiology of Parkinson's disease. The ancient Indian medical system, Ayurveda, traditionally uses Mucuna pruriens to treat Parkinson's disease. In our earlier studies, Mucuna pruriens has been shown to possess antiparkinson and neuroprotective effects in animal models of Parkinson's disease. The antioxidant activity of Mucuna pruriens was demonstrated by its ability to scavenge DPPH radicals, ABTS radicals and reactive oxygen species. Mucuna pruriens significantly inhibited the oxidation of lipids and deoxyribose sugar. Mucuna pruriens exhibited divalent iron chelating activity and did not show any genotoxic/mutagenic effect on the plasmid DNA. These results suggest that the neuroprotective and neurorestorative effect of Mucuna pruriens may be related to its antioxidant activity independent of the symptomatic effect. In addition, the drug appears to be therapeutically safe in the treatment of patients with Parkinson's disease.     

Herba Epimedii water extract elevates estrogen level and improves lipid metabolism in postmenopausal women

Hormone replacement therapy (HRT) can ameliorate lipid metabolism after menopause, but it is not suitable for long-term use because of serious side effects. Herba Epimedii is a widely used herbal medicine in many Asian countries, it potentially treats menopausal syndrome and its complications with few side effects and good curative effects. The study aimed to evaluate the effects of Herba Epimedii water extract on blood lipid and sex hormone levels. Ninety subjects were randomly divided into two groups: a trial group which received Herba Epimedii water extract and a control group which was administered an equal amount of water placebo. At the baseline and after 6 months of medication, serum estradiol (E(2)), progesterone (P), testosterone (T), total cholesterol (TC), triglyceride (TG), high density lipoprotein cholesterol (HDL-C) and low density lipoprotein cholesterol (LDL-C) concentrations were measured. The results indicated that Herba Epimedii water extract decreased the TC and TG levels (p < 0.01). Furthermore, Herba Epimedii water extract significantly increased the serum level of E(2) (p < 0.01) compared with the pre-treatment level. In conclusion, Herba Epimedii water extract produces its beneficial actions in postmenopausal women.     

The effect of Anethum graveolens L. (dill) on corticosteroid induced diabetes mellitus: involvement of thyroid hormones

An investigation was made to evaluate the role of Anethum graveolens L. (dill) leaf extract in the regulation of corticosteroid-induced type 2 diabetes mellitus in female rats. In dexamethasone-treated animals (1 mg/kg for 22 days) an increase in serum concentration of insulin and glucose and in hepatic lipid peroxidation (LPO) was observed. However, there was a decrease in serum concentration of thyroid hormones and in the endogenous antioxidant enzymes, such as superoxide dismutase (SOD), catalase (CAT) and reduced glutathione (GSH) in liver. In animals treated with an equivalent amount of dexamethasone for a similar period (22 days) when received the leaf extract (100 mg/kg b.wt/d.) for last 15 days a decrease in the concentration of both serum glucose and insulin was observed, indicating the potential of the plant extract in the regulation of corticosteroid-induced diabetes. Dexamethasone-induced alterations in the levels of thyroid hormones as well as in hepatic LPO, SOD, CAT and GSH were also reversed by the plant extract.     

Ovarian stromal luteoma in a patient with endometrial carcinoma

A 65-year-old patient with endometrial adenocarcinoma underwent hysterectomy. Pathological examination of the right ovary revealed a coexisting stromal luteoma. The possible relationship between the two neoplasms as well as the intriguing pathogenesis and controversial nomenclature of ovarian steroid cell tumors are discussed. The incidental discovery of a stromal luteoma in a total hysterectomy specimen removed for endometrial carcinoma raises interesting questions about the perceived innocuous nature of these rare lipid cell tumors.