数字调制类型的识别及实现     

宋全有  李万高 《商丘职业技术学院学报》2006,5(2):59-61

通信信号的调制识别是目前研究的热点问题.本文给出一种新的数字调制信号识别方法.高速数字专用芯片ADSP2101是此方法具体实现的重要器件,这一方法在实际通信中有着广泛的应用.  相似文献   

二甲戊乐灵在大蒜中残留分析方法的研究   总被引：2，自引：0，他引：2  

张丽芬 《四川教育学院学报》2005,21(7):91-92

文章主要研究了大蒜中的二甲戊乐灵残留分析方法，考察了加入NaOH水溶液对净化效果的影响，比较了不同含水量Al2O3层析柱的净化效果。  相似文献   

木棉花多糖的微波提取研究     

李粉玲  蔡汉权  林燕如  郭溜聪 《韩山师范学院学报》2011,(6):69-74

本实验利用微波法提取木棉花多糖,考察了料液比、微波功率、浸提时间和浸提次数对木棉花多糖提取率的影响,利用正交实验,优化木棉花多糖的提取工艺,并对结果进行分析．结果显示,最佳提取条件为料液比1：50、微波时间90s、微波功率800w、浸提次数2次,其中浸提次数是最主要影响因素．其次是微波时间和微波功率,料液比对提取的影响...  相似文献   

大蒜功能研究现状   总被引：4，自引：0，他引：4  

张百俊  杨和连  刘爱琴 《河南科技学院学报》2007,35(4):33-35

综述了近年来大蒜之功能研究概况,包括其营养成分、抗菌消炎、抗病毒、防癌抗癌、降低血压血脂、防治糖尿病、预防和治疗爱滋病、补脑.健脑、延缓衰老、防重金属中毒等作用。并提出了食用大蒜的注意事项。  相似文献   

Novel distribution pattern of fibrinolytic components in rabbit tissues extract： a preliminary study     

Lu XG  Wu XG  Xu XH  Gong XB  Zhou X  Xu GB  Zhu L  Zhao XY 《Journal of Zhejiang University. Science. B》2007,8(8):570-574

Objective: The purpose of this work was to investigate the distribution pattern of fibrinolytic factors and their inhibitors in rabbit tissues. Methods: The components of the fibrinolytic system in extracts from a variety of rabbit tissues, including tissue plasminogen activator (tPA), plasminogen activator inhibitor-1 (PAI-1), plasminogen (Plg), plasmin (Pl) and α2 plasmin inhibitor (α2PI), were determined by colorimetric assay. Results: The tissue extracts in renal, small intestine, lung, brain and spleen demonstrated strong fibrinolytic function, in which high activity of tPA, Plg and Pl was manifested; whereas in skeletal muscle, tongue and stomach, higher activity of PAI-1 and α2PI showed obviously. Also excellent linear correlations were found between levels of tPA and PAI-1, Pl and α2PI, Plg and Pl. In related tissues, renal cortex and renal marrow showed distinctly higher activity of tPA and lower activity of PAI-1, with the levels of Plg and Pl in renal cortex being higher than those in renal marrow, where the α2PI level was higher than that in renal cortex. Similarly, the levels of tPA, Plg and Pl in small intestine were higher than those in large intestine, but with respect to PAI-1 and α2PI, the matter was reverse. In addition, the fibrinolytic activity in muscle tissue was lower, however, the levels of tPA, Plg, and Pl in cardiac muscle were obviously higher than those in skeletal muscles, and the levels of PAI-1 and α2PI were significantly lower than those in skeletal muscle. Conclusion: Our data demonstrate that a remarkable difference of the fibrinolytic patterns exists in rabbit tissues, which has probable profound significance in understanding the relationship between the function of haemostasis or thrombosis and the physiologic function in tissues.  相似文献   

金樱子提取物的流变性研究     

皮建辉  向德标  黄婷 《怀化学院学报》2011,30(8):16-19

测定不同条件下金樱子提取物溶液的粘度变化,对其流变性能进行研究.结果表明：金樱子提取物溶液为＂非牛顿流体＂,其粘度随着溶液浓度的增加而增加,当溶液浓度达到1.4 mg/ml时成凝胶状;该溶液在碱性条件下比较稳定,具有良好的耐盐稳定性和抗降解性能;冻融变化使该溶液的粘度有所增加,且冷冻处理后的效果更明显;苯甲酸钠、微波等...  相似文献   

我国普通高校体育教学内容的选择——休闲因子的提取     

洪静静 《安徽体育科技》2007,28(6):70-73

采用文献综述法、问卷调查法、主成分分析法等,通过研究对象在对经过严格筛选的极具代表性的39个体育项目的感受程度的选择后,提取了情感体验因子、生活方式因子、自我个性发展因子、缓压和自由选择因子等4大因子,并对这4个因子进行分析,论证这4大休闲价值因子在大学体育教学内容的选择体系中的重要地位.  相似文献   

Inhibition of preadipocyte differentiation by Lycium barbarum polysaccharide treatment in 3T3-L1 cultures     

《Electronic Journal of Biotechnology》2021

BackgroundLycium barbarum (also called wolfberry), a famous Chinese traditional medicine and food ingredient, is well recognized for its significant role in preventing obesity; however, the molecular mechanisms underlying its preventive effects on fat accumulation are not well understood yet. The aim of this study was to determine the effects and mechanism of Lycium barbarum polysaccharides (LBP) on the proliferation and differentiation of 3T3-L1 preadipocytes. MTT was used to detect the proliferation of 3T3-Ll preadipocytes. Oil red O staining and colorimetric analysis were used to detect cytosolic lipid accumulation during 3T3-L1 preadipocyte differentiation. Real-time fluorescent quantitative PCR (qPCR) technology was used to detect peroxisome proliferator-activated receptor γ (PPARγ), CCAAT/enhancer-binding protein α (C/EBPα), adipocyte fatty-acid-binding protein (aP2), fatty acid synthase (FAS), and lipoprotein lipase (LPL) expression.ResultsThe concentration of LBP from 25 to 200 μg/mL showed a tendency to inhibit the growth of preadipocytes at 24 h, and it inhibited the differentiation of 3T3-L1 preadipocytes in a dose-dependent manner. In the preadipocytes treated with 200 μg/mL LBP, there were reduced lipid droplets in the cytoplasm, and its effect was opposite to that of rosiglitazone (ROS), which significantly reduced the PPARγ, C/EBPα, aP2, FAS, and LPL mRNA expression of adipocytes.ConclusionsLBP exerts inhibitive effects on the proliferation and differentiation of 3T3-L1 preadipocytes and decreases the cytoplasm accumulation of lipid droplets during induced differentiation of preadipocytes toward mature cells. Above phenomenon might link to lowered expression of PPARγ, C/EBPα, aP2, FAS, and LPL after LBP treatment. Thus, LBP could serve as a potential plant extract to treat human obesity or improve farm animal carcass quality via adjusting lipid metabolism.How to cite: Xu X, Chen W, Yu S, et al. Inhibition of preadipocyte differentiation by Lycium barbarum polysaccharide treatment in 3T3-L1 cultures. Electron J Biotechnol 2021;50. https://doi.org/10.1016/j.ejbt.2021.01.003  相似文献   

地衣芽孢杆菌A－57碱性蛋白酶提取新工艺的探讨     

周晓云  张西宁  王晓渊 《科技通报》1994,(6)

研究了以Ｎａ＿２ＳＯ＿４为主要盐析剂提取碱性蛋白酶的工艺，分别就Ｎａ＿２ＳＯ＿４加量、ｐＨ和温度３个因素进行了试验，得出Ｎａ＿２ＳＯ＿４最佳用量为２５％、最佳ｐＨ为８．５和最适温度３０℃．其中Ｎａ＿２ＳＯ＿４加量是影响盐析的主要因素。本文还以有机溶剂丙酮对酶的提取作了初步研究，可考虑用于生产食品级碱性蛋白酶。  相似文献   

大蒜挥发油的分离提取工艺研究进展     

徐丽萍  张亚非  吴正勇 《中国科技信息》2011,(14):81-82

综述了大蒜主要有效成分大蒜油的各种提取方法,对各种方法的优缺点进行了简要分析,并对大蒜油的提取工艺和应用的发展方向提出展望。  相似文献