The B-meson decay constant fB is an important component for studying the B-meson decays, which can be studied through QCD sum rules. We make a detailed discussion on f B from two sum rules up to next-to- leading order...The B-meson decay constant fB is an important component for studying the B-meson decays, which can be studied through QCD sum rules. We make a detailed discussion on f B from two sum rules up to next-to- leading order, i.e. sum rules I and II, which are derived from the conventional correlator and the correlator with chiral currents respectively. It is found that these two sum rules are consistent with each other. The sum rules H involves less non-perturbative condensates as that of sum rules I, and in principle, it can be more accurate if we know the dimensionfour gluon condensate well. It is found that fB decreases with the increment of mb, and to compare with the Belle experimental data on fB, both sum rules I and H prefer smaller pole b-quark mass, mb= 4.68 ± 0.07 GeV. By varying all the input parameters within their reasonable regions and by adding all the uncertainties in quadrature, we obtain fB=172-25^＋23 MeV for sum rules I and fB =214-34^26 MeV for sum rules П.展开更多
本研究旨在探讨灵香草提取物中的主要活性成分Foenumoside B (FB)与有氧运动(AE)协同对高脂血症大鼠肝脏脂质代谢紊乱的影响。通过建立高脂饮食诱导的高脂血症大鼠模型,将大鼠随机分为对照组、HLP组、AE组、FB组和FB+AE联合组,通过实验...本研究旨在探讨灵香草提取物中的主要活性成分Foenumoside B (FB)与有氧运动(AE)协同对高脂血症大鼠肝脏脂质代谢紊乱的影响。通过建立高脂饮食诱导的高脂血症大鼠模型,将大鼠随机分为对照组、HLP组、AE组、FB组和FB+AE联合组,通过实验观察各组大鼠的血脂水平、肝脏脂质代谢相关基因表达以及肝脏组织病理变化。结果表明,与单独使用FB或AE相比,FB与AE的联合干预能更有效地降低血脂水平,调节ACAT1、DGAT2、FAS、SREBP1c、PPARα、LCAT、UCP2、MCD和CPT-1等脂质代谢相关基因的表达,减轻肝脏脂质积累和损伤。本研究证实了FB与AE的协同干预对改善HLP大鼠的脂质代谢紊乱具有显著效果,为开发新型的HLP治疗策略提供了科学依据。展开更多
基金Supported by Natural Science Foundation Project of CQ CSTC under Grant No.2008BB0298by Natural Science Foundation of China under Grant Nos.10805082 and 11075225by the Fundamental Research Funds for the Central Universities under Grant No.CDJZR101000616
文摘The B-meson decay constant fB is an important component for studying the B-meson decays, which can be studied through QCD sum rules. We make a detailed discussion on f B from two sum rules up to next-to- leading order, i.e. sum rules I and II, which are derived from the conventional correlator and the correlator with chiral currents respectively. It is found that these two sum rules are consistent with each other. The sum rules H involves less non-perturbative condensates as that of sum rules I, and in principle, it can be more accurate if we know the dimensionfour gluon condensate well. It is found that fB decreases with the increment of mb, and to compare with the Belle experimental data on fB, both sum rules I and H prefer smaller pole b-quark mass, mb= 4.68 ± 0.07 GeV. By varying all the input parameters within their reasonable regions and by adding all the uncertainties in quadrature, we obtain fB=172-25^＋23 MeV for sum rules I and fB =214-34^26 MeV for sum rules П.
文摘本研究旨在探讨灵香草提取物中的主要活性成分Foenumoside B (FB)与有氧运动(AE)协同对高脂血症大鼠肝脏脂质代谢紊乱的影响。通过建立高脂饮食诱导的高脂血症大鼠模型,将大鼠随机分为对照组、HLP组、AE组、FB组和FB+AE联合组,通过实验观察各组大鼠的血脂水平、肝脏脂质代谢相关基因表达以及肝脏组织病理变化。结果表明,与单独使用FB或AE相比,FB与AE的联合干预能更有效地降低血脂水平,调节ACAT1、DGAT2、FAS、SREBP1c、PPARα、LCAT、UCP2、MCD和CPT-1等脂质代谢相关基因的表达,减轻肝脏脂质积累和损伤。本研究证实了FB与AE的协同干预对改善HLP大鼠的脂质代谢紊乱具有显著效果,为开发新型的HLP治疗策略提供了科学依据。
