AMPK在妊娠期糖尿病发病机制中的作用

腺苷酸活化蛋白激酶是一种重要的蛋白激酶,主要作用是协调代谢和能量平衡.腺苷酸活化蛋白激酶被激活后,在增加骨骼肌对葡萄糖摄取、增强胰岛素敏感性、增加脂肪酸氧化以及调节基因转录等方面发挥重要作用.已经证实脂联素有调节糖脂代谢的作用,但其作用机制尚不十分清楚,很可能是通过腺苷酸活化蛋白激酶介导,对脂联素信号转导通路的研究将成为进一步理解脂联素作用的关键所在.而脂联素又是妊娠期糖尿病的预测因子,所以腺苷酸活化蛋白激酶逐渐成为对妊娠期糖尿病研究中的焦点.     

An Analytic Model of Subminiature Auditory Sensation System for Sound Source Localization

It is reported that some types of insects have a remarkable ability to detect the direction of an incident sound even though its acoustic sensory organs are in very close proximity each other. Maybe the ears are jointed by a cuticular structure with which the separated motions can be coupled mechanically and thus be magnified. In this paper, a detailed model is setup to describe the principle of this type of localization using a mechanical coupled structure. The transfer functions and the responses of the model in terms of time and frequency are analyzed to describe the mechanism of its ability of directional hearing. This analytical model provides a method to design the experimental model for the predetermined incident sound pressure, and the analysis of this model shows that this structure have the ability to determine the direction of the incident stimulus.     

藏汉民族线粒体基因组全序列的比较研究

目的 以藏汉民族线粒体基因组全序列为基础,进行Haplogroup构建和系统发生分析,在全序列水平上比较核苷酸的变异,阐释可能的变异机制和蕴含的生物学意义.方法 采用Applied Biosystems 3730DNA自动测序仪分别对40名藏族和50名汉族的标本进行线粒体DNA序列测定,应用phredPhrap 16.0软件进行全序列拼接,并以rCRS(revised Cambridge Reference Sequence)为标准与测定序列进行比对分析;根据MTTO-MAP的标准,通过Network方法进行Haplogroup构建和系统发生的分析,并结合其它方法对产生的数据进行深入解读.结果 数据分析结果显示:在系统发生上,藏汉民族90个线粒体DNA序列归类到13个Haplogroups,除M9以外,其它各Haplogroup出现频率之间比较差异无统计学意义;通过两个民族的线粒体DNA全序列比对,发现21个分布频率有统计学意义的变异位点,其中的5个为新变异位点;另外,对D-Loop区的5个突变位点进行了单倍型构建,90个标本可分为2种Supertype,发现在藏汉民族之间Supertypel和Supertype 2的分布频率均有统计学意义.结论 藏汉民族在种族起源和系统发生上具有较近的母系遗传关系;在全序列有统计学意义的位点究竟是适应性或者中性选择,抑或是一种病理性突变尚需深入的探讨.     

Evaluation of Job Strain of Family Physicians in COVID-19 Pandemic Period- An Example from Turkey

Journal of Community Health - The purpose of this study was to evaluate family physicians’ job strain during the Covid-19 pandemic and determine the effective factors. The study was carried...     

松质骨中两种纵波的传播特性分析

基于松质骨的层状模型，利用Schoenberg理论分析了松质骨中两种纵波(快纵波和慢纵波)的传播特性；并在理论和实验上详细分析了骨小梁方向与传播方向间的夹角对松质骨中快纵波和慢纵波传播特性的影响。分析结果表明，当超声波平行于骨小梁入射时，松质骨中两种纵波都传播，入射角度在60度附近时，松质骨中两种纵波的相速度曲线有一个转折点，入射角度在60度以上，角度越大时，骨髓和骨小梁耦合得越紧，因此阻止了慢纵波的传播，而只有快纵波传播。     

德都红花-7味散原药方与优化方对肝纤维化大鼠Ⅰ,Ⅲ型胶原mRNA表达的影响

目的:探讨德都红花-7味散原药方及优化方对肝纤维化大鼠Ⅰ,Ⅲ型胶原mRNA表达的影响。方法:40只Wistar大鼠分为正常组、模型组、阳性药组、原药组、优化组。大鼠ip 30%CCl4橄榄油溶液建立肝纤维化模型。同时1次/日ig给药,阳性药组给予秋水仙碱片0.4 mg·kg-1;原药组给予德都红花-7味散0.6 g·kg-1;优化组给予德都红花-7味散优化方0.6 g·kg-1。连续40 d后处死大鼠。取肝脏天狼星红染色,观察肝组织纤维化程度和Ⅰ,Ⅲ型胶原分型。酶联免疫吸附法(ELISA)检测肝组织匀浆Ⅲ型前胶原和Ⅳ型胶原,层粘连蛋白(LN),透明质酸(HA)含量。实时荧光定量PCR法检测Ⅰ型胶原,Ⅲ型胶原mRNA表达变化。结果:天狼星红染色模型组Ⅰ,Ⅲ型胶原纤维较正常组增多,阳性药组、原药组、优化组Ⅰ,Ⅲ型胶原纤维较模型组减少。与正常组比较,酶联免疫法检测模型组Ⅳ型胶原,HA含量升高(P0.05)。与模型组比较,阳性药组、原药组、优化组Ⅲ型前胶原、Ⅳ型胶原、HA含量明显降低(P0.05)。实时荧光定量PCR法检测模型组Ⅰ型胶原mRNA和Ⅲ型胶原mRNA表达较正常组上调(P0.01)。阳性药组、原药组、优化组Ⅰ型胶原mRNA和Ⅲ型胶原mRNA表达较模型组下调(P0.01)。原药组、优化组Ⅰ型胶原mRNA表达较阳性药组下调(P0.05)。优化组Ⅰ型胶原mRNA表达较原药组下调(P0.05)。结论:德都红花-7味散原药方与优化方是通过抑制Ⅰ型胶原mRNA和Ⅲ型胶原mRNA的转录,达到阻断或延缓肝纤维化的发生发展,德都红花-7味散优化方优于原药方。     

Balancing efficacy and safety in the management of atopic dermatitis: the role of methylprednisolone aceponate

Although emollients can be sufficient to manage mild atopic dermatitis (AD), acute flares resulting in moderate‐to‐severe symptoms require treatment with anti‐inflammatory agents, such as topical corticosteroids (TCs) and topical calcineurin inhibitors (TCIs). This review examines the role of a member of the newest class of TCs, the fourth‐generation compound methylprednisolone aceponate (MPA) in AD management, with reference to the chemical structure, pharmacokinetics, efficacy in AD, safety assessed in preclinical and clinical trials and dosing considerations. MPA has an optimized efficacy/safety profile with minimal local or systemic adverse effects. In addition, it offers the opportunity for once‐daily dosing, which provides benefits in terms of patient compliance with treatment.