Repetitive Transcranial Magnetic Stimulation Applications Normalized Prefrontal Dysfunctions and Cognitive-Related Metabolic Profiling in Aged Mice

Chronic high-frequency repetitive transcranial magnetic stimulation (rTMS) is a noninvasive brain stimulation technique that has recently received increasing interests as a therapeutic procedure for neurodegenerative diseases. To identify the metabolism mechanism underlying the improving effects of rTMS, we observed that high frequency (25Hz) rTMS for 14 days could reverse the decline of the performance of the passive avoidance task in aged mice. We further investigated the metabolite profiles in the prefrontal cortex (PFC) in those mice and found that rTMS could also reverse the metabolic abnormalities of gamma-aminobutyric acid, N-acetyl aspartic, and cholesterol levels to the degree similar to the young mice. These data suggested that the rTMS could ameliorate the age-related cognitive impairment and improving the metabolic profiles in PFC, and potentially can be used to improve cognitive decline in the elderly.     

野生樱桃李扦插繁殖研究初报

以野生樱桃李的新梢为试材,采用不同的扦插基质、不同浓度的吲哚丁酸(IBA)、萘乙酸(NAA)和生根粉(ABR)对野生樱桃李插条进行扦插生根试验.试验结果表明,野生樱桃李在蛭石与河沙中的生根效果好于锯末中的生根,蛭石与河沙中插条的生根率接近,生根率分别达到了40.0%、39.6%,因此都可作为野生樱桃李扦插的适宜基质.适宜浓度NAA、IBA可以促进野生樱桃李的生根,浓度过低,达不到促进效果,浓度过高,则可能抑制了插条的生根,相比而言,效果NAA较好,其适宜处理浓度为200 mg/L.但各种激素处理后,无论生根率高低,对根的生长具有促进作用.     

用于筛选直链淀粉含量为中等的籼稻品种的分子标记

用PCR AccⅠ分子标记检测方法 ,检测了来自不同地区的 6 3个栽培水稻品种 (系 )蜡质基因第 1内含子剪接供体 1位碱基是G或是T。另外 ,还测定了这些水稻成熟种子的直链淀粉含量。结果显示该位置是G碱基的水稻品系成熟种子中直链淀粉含量均高于 2 0 % ,该位置是T的均低于 18%。在杂交育种过程中 ,这一分子标记可用于预测水稻植株种子的直链淀粉含量。对高直链淀粉含量的水稻亲本与中等直链淀粉含量的水稻亲本之间 5个籼型杂交组合F2 群体的分析表明 ,蜡质基因第 1内含子 1位碱基是G或是T与水稻种子中直链淀粉含量的高或低是紧密连锁 ,共同分离的。这些结果表明PCR AccⅠ分子标记检测方法可用于选育中等直链淀粉含量的籼稻新品系     

抗HIV-1 gp160独特型阳性抗体的序列分析及表达

为了确定从噬菌体抗体文库中筛选出的抗体的属性和方便目的基因的表达及其产物的纯化,对两株具有“１Ｆ７”独特型的抗ＨＩＶ－１ｇｐ１６０抗体基因进行了序列分析并构建了可溶性表达载体．发现３Ｂ株含有完整的Ｆａｂ段,１Ｄ株只有重链Ｆｄ段．序列测定表明两株克隆的Ｆｄ段基因完全相同,其可变区ＶＨ属于ＶＨⅠ亚群,而３Ｂ株的“轻链”序列与已知的人的κ和λ轻链无同源性．用从另外的Ｆａｂ抗体文库中筛选出来的３株抗乙肝表面抗原抗体的轻链与３Ｂ的重链重组,并选择一个ＨＩＶ－１ｇｐ１６０特异性较好的重组抗体株,命名为３Ｂｓ．构建了１Ｄ株与３Ｂｓ株的可溶性表达载体,免疫印迹实验证实了具有“１Ｆ７”独特型的抗ｇｐ１６０独特型阳性抗体的表达．     

CircPUM1 promotes the malignant behavior of lung adenocarcinoma by regulating miR-326

CircRNAs are reported to be implicated in the development of lung cancer. This study focused on assessing the expression, functions and molecular mechanism of circPUM1 in lung adenocarcinoma. Here, it showed that circPUM1 is significantly upregulated in both lung adenocarcinoma cell lines and tissues. Furthermore, silencing of circPUM1 impaired the proliferation, migration and invasion ability, and increased apoptosis in A549?cells. Nevertheless, overexpression of circPUM1 in SPC-A1 cells has the opposite effect. Silencing of circPUM1 inhibits the tumorigenesis in nude mice. Mechanistically, circPUM1 could sponge miR-326 and promote the expression of its downstream proteins Cyclin D1 and Bcl-2. In summary, this present study revealed that circPUM1 functions as an oncogene to promote the tumorigenesis of lung adenocarcinoma through circPUM1/miR-326/Cyclin D1 and Bcl-2 axis. This indicates that circPUM1 may act as a potential therapeutic target for lung adenocarcinoma.     

Soil respiration in Tibetan alpine grasslands: belowground biomass and soil moisture, but not soil temperature, best explain the large-scale patterns

The Tibetan Plateau is an essential area to study the potential feedback effects of soils to climate change due to the rapid rise in its air temperature in the past several decades and the large amounts of soil organic carbon (SOC) stocks, particularly in the permafrost. Yet it is one of the most under-investigated regions in soil respiration (Rs) studies. Here, Rs rates were measured at 42 sites in alpine grasslands (including alpine steppes and meadows) along a transect across the Tibetan Plateau during the peak growing season of 2006 and 2007 in order to test whether: (1) belowground biomass (BGB) is most closely related to spatial variation in Rs due to high root biomass density, and (2) soil temperature significantly influences spatial pattern of Rs owing to metabolic limitation from the low temperature in cold, high-altitude ecosystems. The average daily mean Rs of the alpine grasslands at peak growing season was 3.92 μmol CO(2) m(-2) s(-1), ranging from 0.39 to 12.88 μmol CO(2) m(-2) s(-1), with average daily mean Rs of 2.01 and 5.49 μmol CO(2) m(-2) s(-1) for steppes and meadows, respectively. By regression tree analysis, BGB, aboveground biomass (AGB), SOC, soil moisture (SM), and vegetation type were selected out of 15 variables examined, as the factors influencing large-scale variation in Rs. With a structural equation modelling approach, we found only BGB and SM had direct effects on Rs, while other factors indirectly affecting Rs through BGB or SM. Most (80%) of the variation in Rs could be attributed to the difference in BGB among sites. BGB and SM together accounted for the majority (82%) of spatial patterns of Rs. Our results only support the first hypothesis, suggesting that models incorporating BGB and SM can improve Rs estimation at regional scale.     

Kinetic resolution of organosilicon compounds by stereoselective dehydrogenation with horse liver alcohol dehydrogenase

Streoselective dehydrogenation of three isomers of trimethylsilypropanol was carried out with horse liver alcohol dehydrogenase (HLADH, EC 1.1.1.1.) and optically active organosilicon compounds were obtained in a water-organic solvent two-layer system with coenzyme regeneration. Furthermore, we examined the effects of the silicon atom on stereoselectivity of HLADH compared to the corresponding carbon compounds. Substitution of the silicon atom for the carbon atom was found to improve the stereoselectivity of HLADH. For example, the optical purity of the remaining 1-trimethylsilyl-2-propanol was higher than 99% enantiomeric excess (ee) at 50% conversion, whereas that of the carbon analogue was 84% ee. This phenomenon was probably ascribable to the bulkiness of the organosilicon compounds derived from their longer Si-C bond. Kinetic analysis in an aqueous monolayer system demonstrated that the specific properties of the silicon atom greatly affected the reactivity of these substrate compounds.Correspondence to: A. Tanaka     

高致病性H5亚型禽流行性感冒病毒血凝素单克隆抗体的制备与初步应用

以禽流感病毒株Ck/HK/Yu22/02（H5N1）作为免疫原,利用常规杂交瘤技术和血凝抑制试验法成功地筛选出6株稳定分泌抗高致病性H5亚型禽流感病毒血凝素的单克隆抗体（单抗）,分别命名为2F2、3C8、3FC1、7C6、10HD4和13G4.经血凝抑制试验法分析,结果发现这6株单抗具有特异性高、反应性强、识别谱宽且互补等特点.基于单抗2F2,初步建立了三种H5N1病毒诊断方法,经评估证实均具有很好的特异性.由此说明,研究制备的抗H5亚型禽流感病毒血凝素单抗可适用于H5N1病毒的诊断.     

内蒙古赛罕乌拉国家级自然保护区猞猁食物构成初步分析

猞猁(Lynxlynx)是内蒙古赛罕乌拉国家级自然保护区内的顶级捕食者,在维持该地区生态平衡和调节猎物数量上具有重要地位。分析猞猁粪便样品残留物不仅能明确其猎物构成,了解与同域分布其他捕食者的关系,还能为制定物种保护措施和栖息地管理策略提供科学参考。本研究在2006至2008年间利用样线法在该区域收集到35份猞猁粪便样品。通过相对出现频率法对粪样进行食性分析,发现猞猁的主要食物组成以蒙古兔(Lepus tolai,30.85%)和植物(28.72%)较多;年度(χ~2=18.696,P <0.001)和季节性(χ~2=74.695,P <0.001)食物构成均存在显著差异。结果表明,蒙古兔在猞猁的食物组成中占最重要地位;猞猁的食物构成与季节有关,寒冷季节捕食大型猎物,而温暖季节捕食的小型猎物更常见。