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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
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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
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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
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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
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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
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某炼油厂减二线NMP抽出油芳碳率高达51.84%,将此抽出油利用糠醛单溶剂再抽提,剂油比为3时重相油中芳烃质量百分含量在90%以上,芳碳率在70%以上,满足高芳烃油芳烃含量要求。利用糠醛+石油醚再抽提此抽出油效果比单用糠醛更好,在减二抽:糠醛∶石油醚=1∶1∶1和减二抽∶糠醛∶石油醚=1∶1∶2时,重相油中芳烃质量百分含量均在90%以上,芳碳率分别为74.65%和85.60%;重相油中糠醛含量比糠醛∶减二抽=3时少,蒸出溶剂耗能耗时较少。双溶剂处理后轻相油裂化性能均较处理前优化明显,在减二抽:糠醛∶石油醚=1∶1∶1时裂化性能更佳。 相似文献
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采用比浊法和菌丝体湿重法测定生物量,测定了初烤烟叶蒸馏水浸出物对4种细菌和3种真菌生长的影响.结果表明,烟叶浸出物对细菌和真菌生长的影响不同.在剂量范围内,烟叶浸出物对铜绿假单孢菌(Pseudo-monas aeruginosa),大肠杆菌(Escherichia coli),枯草芽孢杆菌(Bacillus subtilis)和金黄色葡萄球菌(Staphylococcusaureus)没有抑制作用,对爪哇毛霉(Mucor jaranicas),灰葡萄孢(Botrytis cinerea)和白色念珠菌(Canadida albi-cans)有抑制作用,抑制率分别为89.5%,74.8%和19.4%. 相似文献