简介:摘要:粗轧R1轧机的工作辊更换,是基于2250热轧产线品种结构调整、板形质量控制提出的正常工艺需求,更换频率在正常生产情况下为轧辊达到累计轧制吨位为(12万吨±3万吨)约1W/次,但单次换辊需人工手动分步操作,耗时较长(40min)且容易操作失误。整个粗轧R1轧机的换辊系统,共包含21个感应限位、11个压力传感器、7个位置传感器、2个编码器及1个流量计。在制定的软件程序及机械设备导位下按步骤进行,单次更换过程共涉及45步衔接步骤,为提高R1换辊效率,过程需要保证电气及机械设备稳定、步骤衔接紧密、设备动作响应迅速及时,本文主要通过系列优化技术,从单体设备的动作速度及衔接紧密性上,优化R1工作辊的更换效率,以达到高效稳定更换R1轧机换辊的目的。
简介:AbstractPanax notoginseng is an ancient Chinese medicinal plant that has great clinical value in regulating cardiovascular disease in China. As a single component of panax notoginosides, notoginsenoside R1 (NGR1) belongs to the panaxatriol group. Many reports have demonstrated that NGR1 exerts multiple pharmacological effects in ischemic stroke, myocardial infarction, acute renal injury, and intestinal injury. Here, we outline the available reports on the pharmacological effects of NGR1 in ischemia-reperfusion (I/R) injury. We also discuss the chemistry, composition and molecular mechanism underlying the anti-I/R injury effects of NGR1. NGR1 had significant effects on reducing cerebral infarct size and neurological deficits in cerebral I/R injury, ameliorating the impaired mitochondrial morphology in myocardial I/R injury, decreasing kidney injury molecule-1 and neutrophil gelatinase-associated lipocalin in renal I/R injury and attenuating jejunal mucosal epithelium injury in intestinal I/R injury. The various organ anti-I/R injury effects of NGR1 are mainly through the suppression of oxidative stress, apoptosis, inflammation, endoplasmic reticulum stress and promotion of angiogenesis and neurogenesis. These findings provide a reference basis for future research of NGR1 on I/R injury.
简介:AbstractBackground:Breast cancer (BC) is a common malignancy with highly female incidence. So far the function of notoginsenoside R1 (NGR1), the extract from Panax notoginseng, has not been clearly elucidated in BC.Methods:Optimal culture concentration and time of NGR1 were investigated by cell counting kit-8 assay. Cell proliferation ability was measured by colony formation assays. Transwell assay was used to detect the effect of NGR1 on cell migration and invasion. The apoptosis rate of cells between each group was measured by TUNEL assay.Results:NGR1 treatment has an inhibitory effect on proliferation, migration, invasion, and angiogenesis and a stimulating effect on cell cycle arrest and apoptosis of Michigan Cancer Foundation-7 (MCF-7) cells. The 50% growth inhibitory concentration for MCF-7 cells at 24 h was 148.9 mmol/L. The proportions of MCF-7 cells arrested in the G0/G1 phase were 36.94±6.78%, 45.06 ± 5.60%, and 59.46±5.60% in the control group, 75, and 150 mmol/L groups, respectively. Furthermore, we revealed that NGR1 treatment attenuates BC progression by targeted downregulating CCND2 and YBX3 genes. Additionally, YBX3 activates phosphatidylinositol 3-phosphate kinase (PI3K)/protein kinase B (Akt) signaling pathway by activating kirsten rat sarcoma viral oncogene, which is an activator of the PI3K/Akt signaling pathway.Conclusion:These results suggest that NGR1 can act as an efficacious drug candidate that targets the YBX3/PI3K/Akt axis in patients with BC.
简介:摘要目的探究三七皂苷R1对老龄大鼠学习记忆的作用及其机制。方法20月龄SD雄性大鼠30只,以每组10只随机分为溶剂对照组、三七皂苷R1低剂量(5mg?kg-1)组和高剂量(10mg?kg-1)组,另取2月龄SD雄性大鼠10只为正常对照组。采用Morris水迷宫实验记录老龄鼠的行为变化。Westernbolt法测量PKA、P-CREB、BDNF含量。结果三七皂苷R1能缩短老龄大鼠的逃避潜伏期并增加其穿越平台次数,使老龄大鼠脑组织中的BDNF的蛋白表达水平增高。结论三七皂苷R1能改善老龄大鼠的学习记忆能力。BDNF信号通路是其作用机制之一。
简介:摘要随着人类生活质量的提高,饮用水水质问题受到高度的关注。污泥回流是在此基础上发展起来的强化混凝技术。首先,本文从单独污泥回流、投加混凝剂和与其他工艺联合的污泥回流三方面介绍对污染物的强化去除;其次,阐述了污泥回流的絮体特性及对污染物的去除机理;最后,评估了污泥回流的安全性风险并提出了相应的解决方法,展望了污泥回流技术的发展方向。
简介:摘要目的建立三七丹参片中人参皂苷Rg1、Rb1和三七皂苷R1的含量测定方法。方法高效液相色谱法;色谱柱为AgiLentHypersiLC18柱(4.0×250mm,5μm),以乙腈为流动相A,以水为流动相B,梯度洗脱,流速1ml/min,柱温25℃,检测波长为203nm。结果人参皂苷Rg1进样量为0.1152~0.96mg/ml,与峰面积呈良好线性关系(R2=0.9995),平均回收率为100.68%,平均峰面积(RSD)为2.77%,人参皂苷Rb1进样量为99.96~833μg/ml,与峰面积呈良好线性关系(R2=0.9996),平均回收率为97.17%,平均峰面积(RSD)为1.98%,三七皂苷R1进样量为22.32~186μg/ml,与峰面积呈良好线性关系(R2=0.9997),平均回收率为99.82%,平均峰面积(RSD)为1.87%。结论所建立的方法简便、准确、重复性好,可用于三七丹参片中的人参皂苷Rg1、Rb1和三七皂苷R1含量测定。
简介:目的:建立舒胸片中人参皂苷Rg1、人参皂苷Rb,和三七皂苷R1含量的HPLCI]定方法。方法:采用DiamosilC18柱(4.6X250mm,5gm),流动相乙腈一水,梯度洗脱,柱温30℃,流速lmL/min,203nm波长下检测。结果:人参皂苷Rg1、人参皂苷Rb1、三七皂苷R,分别在0.442~11.050gg(r=0.9999)、0.344~8.600μg(P=0.9999)、0.208~5.200gg(r=0.9995)范围内线性关系良好,平均回收率分别为98.93%(RSD为1.7%1、98.88%(RSD为1.4%)、98.98%(RSD为1.4%)。结论:以HPLC法检测舒胸片中人参皂苷Rg1、人参皂苷Rb1和三七皂苷R1,方法简便、准确、灵敏度高、重复性好。
简介:目的:建立复方消脂胶囊中人参皂苷Rg1、Re、Rb1及三七皂苷R。含量的分析方法。方法:采用高效液相色谱法,色谱柱:PhenomenexLunaC18(2)(4.6mm×250mm,5μm);流动相:以乙腈为流动相A,以水为流动相B;柱温:27℃(70min时降为20℃);检测波长:203nm;流速:1.0mL·min-1。结果:三七中人参皂苷Rg1线性范围为1.88~11.28μg/mL,回收率为100.26%,RSD为1.56%;人参皂苷Re线性范围为0.294~1.764μg/mL,回收率为100.68%,RSD为0.64%;人参皂苷Rb1线性范围为1.76~10.56μg/mL,回收率为100.53%,RSD为0.58%;三七皂苷R。线性范围为0.376~2.256μg/mL,回收率为99.21%,RSD为1.38%。人参皂苷Rg1、Re、Rb1及三七皂苷R1四种成分均达到良好分离,在测定范围内线性良好,回收率均在99%~101%之间。结论:所建立的含量测定方法简便可行、重复性好,可用于复方消脂胶囊的质量监控。
简介:目的:建立用于测定三七皂苷R1血药浓度的液相色谱-质谱联用分析方法,并研究三七皂苷R1在犬体内的药代动力学.方法:Beagle犬6只iv0.7131mg·kg-1三七皂苷R1后采集系列血样,利用LC-MS联用系统测定血浆药物浓度,并用3P97软件拟合求算药代动力学参数.结果:三七皂苷R1浓度在5.0~2000μg·L-1内,线性关系良好(γ=0.9996).绝对回收率高于90%,日内、日间RSD均小于15%,符合生物样品分析要求.6只Beagle犬iv0.7131mg·kg-1三七皂苷R1后的血药浓度-时间曲线符合二室模型,其分布和消除相的半衰期分别为38.59min和230.06min.曲线下面积(AUC)、中央室分布容积(V)和血浆清除率(CL)分别为67353.75mg·min·ml-1,3.53L·kg-1和0.1068L·kg-1·min-1.结论:建立的LC-MS联用方法专属性强,灵敏度高,可用于三七皂苷R1的体内定量分析.
简介:[摘要] 污水处理厂作为环境保护、恢复的重要工程,污水处理厂运营过程二沉池中心污泥回流效果直接影响污水厂的峰值水量和日处理能力,特别小型污水处理厂日处理量有限,施工过程中二沉池中心污泥回流系统的工程质量直接影响污泥回流量和沉淀效果,间接影响污水处理厂的出水水质,故二沉池中心污泥回流系统的安装技术成为施工的关键重难点工作。
简介:免疫细胞化学技术和Westernblot分析证实MCF7adr细胞P-糖蛋白(PGP)过量表达,而MCF7细胞无PGP表达。1:60R1(复方R1)和1:90R1处理细胞2小时、3小时均使MCF7adr细胞PGP表达下降,并且与药物作用时间和浓度有关。Northernblot分析示MCFT7adr细胞mdr2mRNA高表达,而MCFT细胞无表达。1:60R1、1:90R1处理2小时或3小时均使MCF7adr细胞mdr1RNA表达降低,且随着时间的延长而更加明显。浓度(1:60R1,1:90R1)改变对耐药细胞mdr1mRNA表达下降的影响程度无明显差异。结果提示R1的逆转作用机理之一可能与其从蛋白质和mRNA水平使耐药细胞PGP表达下降,从而增加细胞内药物聚集量和抗癌药细胞毒性有关。
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