循环血miR-21-3p作为脓毒症心肌病的标记物

已有研究发现微小RNA(microRNAs, miRNAs) 可由细胞分泌并释放进入循环系统, 在血清、血浆、尿液和其他体液中稳定存在, 并可作为非损伤性生物标记物对多种疾病进行早期诊断、鉴别分期、预后判断和疗效监测等. 与健康对照者相比, miR-21-3p 在22 例脓毒症心衰患者血浆中显著升高. 通过绘制受试者工作特征(receiver operating characteristic, ROC)曲线, 并分析其与临床参数的相关性发现, miR-21-3p 在鉴别脓毒症心衰和健康人群时, 曲线下面积(area under the curve, AUC)为0.949. 相关性分析结果显示, 血浆miR-21-3p水平与B 型脑钠肽(brain natriuretic peptide, BNP)(r = 0.968, P < 0.001)、心肌肌钙蛋白T (cardiac troponin T, cTNT)(r = 0.257, P = 0.002)水平呈正相关. 因此, 外周血中的miR-21-3p有作为脓毒症心肌病的生物标记物的潜力.     

自主式水下航行器的概念及技术发展--从“蓝鳍金枪鱼-21”谈起

“蓝鳍金枪鱼-21”自主式水下航行器在对马航客机MH370的搜寻工作中承担水下搜索任务,进入大众视野,引起了人们对自主式水下航行器的关注。文章重点介绍了“蓝鳍金枪鱼-21”以及当前自主式水下航行器技术的应用领域及发展方向。     

Characterization and localization of the rat,mouse and human testicular phosphatidylethanolamine binding protein

A cytosolic 23kDa protein was initially puified from bovine brain and shown to bind phosphatidylethanolamine. Later, it was also characterized in rat and human brain, and it is now known to be widespread, having been found in numerous tisues in several species. Here, we report the high level of mRNA and phosphatidyl ethanolamine binding protein expression in rat testis and to a lesser extent mouse testis. In human testis, although it was not detectable by Northern blot analysis, the mRNA was shown be present when PCR amplificatin was performed. Immunohistochemical experiments revealed that the testicular phosphatidylethanolamine binding protein (tPBP) is principally expressed in the elongated spermatids of both rat and mouse testis. This finding, and the association of tPBP with cellular membranes, suggest its possible implication in membrane remodelling during spermatid maturation.     

Molecular cloning of a full-length cDNA for ECBP21 from Angelica dahurica

ECBP21 is an extracellular calmodulin-binding protein which was first detected and purified from extracellular extracts of suspension-cultured cells of Angelica dahurica. The purified protein was electroblotted onto PVDF membrane and the amino acid sequences from 1 to 20 were determined. Using degenerate oligonucleotides of the sequence, a full-length cDNA coding for ECBP21 was isolated by a combination of RT-PCR and 5′-RACE cloning. The cDNA contains 947 nucleotides and codes for a precursor protein of 216 amino acids. The N-terminal 1-25 amino acid sequence is a predicted signal peptide and the other 26-216 amino acid sequence is a mature peptide. The 26-45 amino acid sequence shows identity with the N-terminal amino acid sequence of purified ECBP21 from Angelica dahurica. The fragment of encoding the mature protein was cloned into pET-28b(+) and transformed into E. coli BL21(DE3). A protein with relative molecular mass 21 ku was expressed in E. coli. Using a biotinylated-CaM gel overlay technique, the expression protein was tested for its ability to bind CaM. The results indicated that the expression protein is a Ca2+- dependent CaM-binding protein. Thus, these results further defined the cDNA clone for ECBP21. This work laid a foundation for elucidating biological functions of ECBP21 by using molecular biological means.     

文化教学与《21世纪大学英语》

通过《21世纪大学英语》的课文实例，分别从文化与语言交际、文化与非语言交际、文化与教学模式、文化与翻译四个方面说明《21世纪大学英语》在选材上独特的文化气息，并结合大学英语教学大纲的要求，对《21世纪大学英语》在文化教学中的新突破作进一步的肯定评价。     

"21世纪大学英语网络课堂"课件的开发

信息技术的迅速发展和应用为大学英语教学提供了新的方法和手段，本文介绍了作者基于现代信息技术和建构主义理论开发的“21世纪大学英语网络课堂”，该课堂以现行大学英语教材为原本。旨在为教师教学提供丰富资源和为学生学习营造相对真实的语言环境。     

(Ni79Fe21)0.48-(Al2O3)0.52纳米颗粒膜的巨霍尔效应

采用磁控溅射法 ,在玻璃基片上制备了一系列不同Ni79Fe2 1含量的 (Ni79Fe2 1) x (Al2 O3 ) 1-x纳米颗粒膜样品 ,并对样品的巨霍尔效应进行了研究。在 (Ni79Fe2 1) 0 .48 (Al2 O3 ) 0 .52 颗粒膜样品中 ,透射电镜 (TEM )照片清晰地显示出纳米Ni79Fe2 1颗粒包裹于Al2 O3 中 ,且电子间的量子相干效应明显 ,这可能是导致霍尔效应增强的主要原因。室温下测出了最大的巨霍尔效应值达到 4 .5 μΩ·cm。改变基片温度 ,发现巨霍尔效应值变化不大 ,说明该颗粒膜具有良好的热稳定性 ,因而在磁传感器上有良好的应用前景     

展望21世纪的农业生物技术--后基因组时代的农业生物技术

概括地论述了20世纪农业生物技术发展所依托的理论和技术,并对上世纪在较短时间内建立和发展起来的农业生物技术进行了综合评述.作者认为:21世纪的农业生物技术将以后基因组时代为特征而获得巨大的发展;作者还全面展望了在后基因组时代的新世纪中,农业生物技术将取得的革命性的成就、应注意的问题和应创建和具备的条件.     

浅谈西文图书的主要检索点及其著录

介绍了ISBN(国际标准书号)检索点、责任者检索点、题名检索点、主题词检索点和分类号检索点。