润康普瑞牌平脂康胶囊辅助降血脂功能实验研究

目的:观察润康普瑞牌平脂康胶囊辅助降血脂的作用。方法:将动物随机分为高脂模型对照组和平脂康胶囊低、中、高三个剂量组,剂量组每天灌胃给予样品,并同时喂饲高脂饲料。于给样37d后,取血分别测定血清总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白(HDL-C)等指标。结果:该胶囊对大鼠体重增长无不良影响。与高脂对照组比较,该受试物中剂量组能降低血清甘油三酯(P<0.05);高剂量组能降低血清总胆固醇和甘油三酯(P<0.05),差异具有统计学意义。结论:平脂康胶囊具有辅助降血脂的功能。

Effects of Fatty Acids on Low-Sulfur Diesel Lubricity:Experimental Investigation, DFT Calculation and MD Simulation

The continuous reduction in sulfur content of fuels would lead to diesel fuel with poor lubricity which could re- sult in engine pump failure. In the present work, fatty acids were adopted as lubricity additives to low-sulfur diesel fuel. It was attempted to correlate the molecular structures of fatty acids, such as carbon chain length, degree of saturation and hy- droxylation, to their lubricity enhancement, which was evaluated by the High-Frequency Reciprocating Rig （HFRR） meth- od. The efficiency order was supported by the density functional theory （DFT） calculations and the molecular dynamics （MD） simulations. The lubricity enhancing properties of fatty acids are mainly determined by the cohesive energy of adsorbed films furmed on iron surface. The greater the cohesive energy, the more efficiently the fatty acid would enhance the lubricity of low-sulfur diesel fuel.

重拾国货精品,绝不止面子问题

制胭脂,贴花黄,上妆抿鬓角……在一波波"汉方美容"、"国货精品"的热潮中,那些似乎已经远离舞台中心许久的产品又回到了我们的视线中心。还是那种熟悉的包装,亲民的价格,切实的功效,经过时间和市场的双重考验,历经千锤百炼的试用者,为了面子,我们重拾国货精品。但得到的,绝不单单是面子的问题。

The Development and Application of Automotive CVJ Grease

The development trend of the CVJ (constant velocity joint) greases is briefly introduced in this paper. Based on the evaluation of various base stocks, thickeners and additives, the formulation and manufacture of the long-life CVJ grease is finalized. Bench tests and vehicle performance evaluation tests have showed that the ‘Great Wall brand’ new polyurea-based CVJ grease can meet the demand of automo- tive CVJ. This grease features an outstanding low and high temperature performance, extreme pressure, anti-corrosion and anti-rust properties equivalent to those of similar overseas greases. Compared with the traditional MoS2 containing lithium based CVJ grease, the performance of the new grease is much better.

Optimization of Grease Properties to Prolong the Life of Lubricating Greases

Grease life refers to the time it takes for the grease to lose its ability to keep the lubrication due to grease degradation. As grease life is generally shorter than fatigue life of bearing, the service life of grease-lubricated rolling bearings is often dominated by grease life. When designing a bearing systemolecular weightith grease lubrication, it is necessary to define the operating conditions limits of the bearing, for which grease life becomes a determining factor. Prolongation of grease life becomes an especially important challenge when the bearing is to be operated trader high-speed, high-temperature, and other severe conditions. Selecting a number of commercially sold greases composed of varying base oils, the author evaluated their properties and analyzed how each property affected the grease life by performing a multiple regression analysis. The optimum grease composition to best exploit each property was also examined. The results revealed among others that one would need to first determine the base oil type and then maximize ultimate bleeding while minimizing the evaporation rate.

Tribological Performances of Fatty Acyl Amino Acids Used as Green Additives in Lubricating Oil

The friction and wear characteristics of lauroyl glutamine, lauroyl glycine and lauroyl alanine, used as green additives in HVI 350 mineral lubricating oil, were evaluated on a four-ball tribotester. The morphologies and chemical species of the worn surfaces were analyzed by scanning electron microscope （SEM） and X-ray photoelectron spectroscope （XPS）, respectively. The test results indicated that the three fatty acyl amino acids could effectively improve the anti-wear and friction-reducing abilities of the HVI 350 mineral oil. The improvement in anti-wear and friction-reducing abilities of the mineral oil by the related amino acids was mainly ascribed to the formation of a composite boundary lubrication film due to the adsorption of amino acids on the friction surfaces.

Study on the Effect of Surface Modification on the Properties of Bentonite Greases

In order to investigate the influening factors of organic modification procedure and find out connections between organic modification and the properties of bentonite greases, organic montmorillonite(OMMT) thickeners with different surfactant dosages and constituents were synthesized through intercalation reaction between sodium montmorillonite(NaM MT) and quaternary ammonium surfactants in aqueous solvents. The lubricating greases were prepared with the resulting organoclays, while the penetration and oil separation of lubricating greases were evaluated, respectively. The surface modification process of montmorillonite(MMT) was analyzed and the thickening mechanism of OMMT was discussed in this study. The experimental results showed that, with an increasing amount of surfactant, the basal spacing between the clay platelets was increasing and the structure of modifier molecules layer in the interlayer was changing from lateral bilayer to paraffin-type bilayer. The optimal properties of lubricating greases were achieved, when the structure of surfactant molecules loaded in the interlayer was the paraffin-type monolayer, which meant that the dosage of modifier was equal to 120—140 mmol/(100g). Meanwhile, it was found that the thickening performance, colloid stability, anti-wear and friction-reducing performance of lubricating greases were improved, when the surfactants were mixed with octadecyl trimethyl ammonium chloride(OTAC) and hexadecyl trimethyl ammonium chloride(HTAC). And the optimum mole ratio of two surfactants is was 1:1.

Research on the Relationship between Molecular Activity of Additives and Lubricating Performance of Aluminum Rolling Oil

In this paper,an ab initio,local density functional(LDF)method was used to explore the relationship between the molecular properties of additives and the lubricating performance of aluminum rolling oil.The structural properties of butyl stearate,dodecanol,docosanol,and methyl dodecanoate were studied according to the density functional theory.The calculated data showed that the atoms in or around the functional groups might be likely the reacting sites.Because of the different functional groups and structure of ester and alcohol,two types of complex additives,dodecanol and butyl stearate,methyl dodecanoate and butyl stearate,respectively,were chosen for studying their tribological properties and performing aluminum cold rolling experiments.The test results agreed with the calculated results very well.The complex ester,viz.methyl dodecanoate and butyl stearate,had the best lubricating performance with a friction coefficient of 0.084 1 and a permissive-rolling thickness of 0.040 mm as compared with that of dodecanol-butyl stearate-base oil formulation.

Intussusception Induced by Transverse Colon Lipoma in a Young Male PatientmOne Case Report

Colonic lipoma is an uncommon benign non-epithelial tumor of the gastrointestinal tract. It typically occurs in the ascending colon and among old female patients. Most cases are asymptomatic and do not require any special treatment. However, we encountered a young male patient with a symptomatic lipoma located in the transverse colon that induced a transcolocolonic intussusception. He presented with such symptoms as diarrhea, tenesmus, abdominal pain, and weight loss. Colonoscopy revealed a spherical polypoid lesion with partial congestion and ulceration on its surface, and the related biopsy and inflammatory cell infiltration. revealed spindle cell hyperplasia Reduction of the intussusception was not attempted, and transverse hemicolectomy was conducted. Although several novel techniques have been reported for the diagnosis and treatment of colonic lipoma, for our case patient, an exact diagnosis was made postoperatively via histological examina- tion and laparotomy was performed.

吉藩九龙纽寿山石印

明代(1368—1644年)通高14.7、直径6.6厘米,重750克1951年湖南省文物管理委员会移交湖南省博物馆珍藏以寿山石治印始于元明之间。该印以九龙为纽,充分发挥寿山石脂润如玉、柔而易攻的特性,施以精艺,突出龙之神、情、趣,生动毕肖。印文16字,篆书,笔画两头肥瘦均匀,末不出锋,将宽大的印面填满,具有典型的明代印章风格。

Hepatic CDP-diacylglycerol synthase 2 deficiency causes mitochondrial dysfunction and promotes rapid progression of NASH and fibrosis

Nonalcoholic fatty liver disease(NAFLD)encompasses a spectrum of pathologies,ranging from steatosis to nonalcoholic steatohepatitis(NASH).The factors promoting the progression of steatosis to NASH are still unclear.Recent studies suggest that mitochondrial lipid composition is critical in NASH develop-ment.Here,we showed that CDP-DAG synthase 2(Cds2)was downregulated in genetic or diet-induced NAFLD mouse models.Liver-specific deficiency of Cds2 provoked hepatic steatosis,inflammation and fibrosis in five-week-old mice.CDS2 is enriched in mitochondria-associated membranes(MAMs),and hepatic Cds2 deficiency impaired mitochondrial function and decreased mitochondrial PE levels.Overexpression of phosphatidylserine decarboxylase(PISD)alleviated the NASH-like phenotype in Cds2^(f/f);AlbCre mice and abnormal mitochondrial morphology and function caused by CDS2 deficiency in hepatocytes.Additionally,dietary supplementation with an agonist of peroxisome proliferator-activated receptor alpha(PPARa)attenuated mitochondrial defects and ameliorated the NASH-like phe-notype in Cds2^(f/f);AlbCre mice.Finally,Cds2 overexpression protected against high-fat diet-induced hepatic steatosis and obesity.Thus,Cds2 modulates mitochondrial function and NASH development.

用心爱护您的头发

头发,您应该一点儿也不陌生,但您本人究竟是什么性质头发?适合梳理什么式样的发型?采用何种护发技巧?您可能就不那么清楚了吧。从知识方面说,这就是发质、发型和护发技巧。这篇文章就是要告诉您,从现在开始,您不必再为护理头发而烦心了!认真看一看美国权威头发专家们的指点,相信您立刻就会悟出一些关于护发的“真谛”,这在今后的生活中肯定是行之有效的。